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instruNet i420 Datasheet
Measure Volts, Ohms, Amps, RTD, Thermocouple, Strain Gage, Load Cell.

 

i420 Features Features

 
Product

 


 
 

Product Summary Summary

  • This Amplifier (not A/D) module provides 20se/10di voltage input channels (Ch#1...#20)40 , each of which are independently software programmable with Windows software that support the direct connection to many common sensor types
  • This module does not contain an A/D converter, and therefore internally routes measured voltage to an i43x A/D module anywhere in card cage. At least one i43x must be installed in order to measure a voltage with this module.
  • Voltage input range on each channel is independently software programmable to one of: ±20mV, ±40mV, ±80mV, ±2.5V, ±5V, ±10V, 0 to 5V, 0 to 10V
  • Each channel provides the following software programmable parameters: A/D Signal-Averaging-Per-Point (0 ... 100mSec)3 , Sample-Rate (samples-per-second-per-channel)17 , Digital IIR Filter (LowPass, HighPass, BandPass, or BandStop)55 , Voltage Measurement Range (±20mV...±10V)1 , Sensor Type13 , and Single-Ended or Differential Wiring
  • Excitation power (+3.3V ±0.2V, <220mA, 22mA per sensor max) is provided for sensors, along with other End User Power voltages. This 3.3V, which is referenced to instruNet Ground, is automatically readback by A/D when calculating sensor values.
  • The 20mA sink digital I/O port consists of 4 individual TTL-compatible lines (Ch#25...#28), each of which can be configured as: digital input bit, digital output bit, control output, clock output43 . When configured as an input, a channel can be used to sense a digital high (2.1 to 30 Volts) or digital low (-10V to .65Volts). When configured as an output, a channel can be set high (e.g. >2V) or low (e.g. <0.8V). These I/O pins are short-circuit protected against high voltages up to 32.0V and down to -16.0V.


Optional i51x Wiring Box

 

i510 Low Cost Wiring Box i511 BNC Wiring Box i512 Wiring Box

 



Optional Accessories

 

instruNet World PLUS Software (iW+) Application Software Shunt Resistors

 



Subjects Discussed in this Datasheet, iNet-420

 


 


 
Analog Voltage Input, iNet-420

 

Parameter Specifications19 Notes
Description 20se/10di Voltage Input Channels This Amplifier (not A/D) module provides 20se/10di voltage input channels (Ch#1...#20), each of which are independently software programmable with Windows software that support the direct connection to many common sensor types
Absolute Accuracy Specified Error components (i.e. INL, DNL, linearity, noise, temperature drift66 , time stability) are summed and specified as "Absolute Accuracy" with the following supported sensors (click for accuracy and maximum sample rate): Voltage,  Thermocouple,  Thermistor,  RTD,  Load Cell,  Strain Gage,  Potentiometer,  Current,  Resistance
Voltage Ranges ±20mV ... ±10V,
0 to 5V ... 0 to 10V		 Voltage input range on each channel is independently software programmable to one of: ±20mV, ±40mV, ±80mV, ±2.5V, ±5V, ±10V, 0 to 5V, 0 to 10V
Internal A/D (none) This module does not contain an A/D converter, and therefore internally routes measured voltage to an i43x A/D module anywhere in card cage. At least one i43x must be installed in order to measure a voltage with this module.
Sensors Direct Connect Each of the 10 differential channels support the direct connection to the following sensor types (click for Wiring Diagram and Setup Instructions): Voltage,  Thermocouple,  Thermistor,  RTD,  Load Cell,  Strain Gage,  Potentiometer,  Current,  Resistance
Channel Amplifiers Software Programmable Each channel provides the following software programmable parameters: A/D Signal-Averaging-Per-Point (0 ... 100mSec)3 , Sample-Rate (samples-per-second-per-channel)17 , Digital IIR Filter (LowPass, HighPass, BandPass, or BandStop)55 , Voltage Measurement Range (±20mV...±10V)1 , Sensor Type13 , and Single-Ended or Differential Wiring
Wiring Single-Ended or Differential Single-ended (SE) wiring involves measuring the voltage between the input pin and instruNet Ground; whereas Differential (DI) wiring involves measuring the voltage between two input pins
Protected Voltage -25 to +25V Short any combination of voltage input channels to external -25 to +25V power source (i.e. capable of high current), instruNet power on or off, any duration, without damage
Bandwidth Depends on Voltage Range See absolute accuracy specification tables below (e.g. Voltage Accuracy) for bandwidth details
RFI Filter 24 KHz RFI filter
on ≤ ±80mVrange		 RFI filter is a low pass filter that rejects high frequencies that could cause small measurement errors if left unfiltered
Digital Filter LowPass, HighPass, BandPass, or BandStop Each channel provides optional digital IIR lowpass, highpass, bandpass and bandstop filters with independent software programmable cut-off frequency, minimum dB stopband attenuation, maximum dB passband attenuation, and filter type (e.g. Elliptic, Chebyshev B, Chebyshev S, and Butterworth). Number of poles/zeros (i.e. "filter order") is programmable between 2 and 3255 .
Maximum Sample Rate17 166Ks/sec/aggregate Digitize70 at a maximum sample rate of 166K sample/sec for 1 channel on largest voltage input range. More channels at same voltage input range involves slower rates, e.g. 83Ks/sec per channel for 2 channels, 41Ks/sec/ch for 4 channels, and 20Ks/sec/ch for 8 channels. For a details on maximum sample rate and bandwidth with different voltage input ranges, sensor types, and a/d averaging61 ; see absolute accuracy specification tables below (e.g. Voltage Accuracy). Things that decrease High Speed I/O sample rate: longer computer to instruNet cable, i330 optical-isolator. Sample rate is set accurate to 50 ppm (e.g. user specifies 20000 s/sec yet system actually digitizes at 20001 s/sec). Minimum sample rate is 0.015 samples/sec/ch.
Sensor Excitation Included Excitation power (+3.3V ±0.2V, <220mA, 22mA per sensor max) is provided for sensors, along with other End User Power voltages. This 3.3V, which is referenced to instruNet Ground, is automatically readback by A/D when calculating sensor values.

 

Electrical Specifications, Analog Voltage Input, iNet-420

 

Parameter Specifications19 Notes
Common Mode Voltage -10 to +10V All voltage input pins must be driven with a voltage between -10 and +10V, with respect to instruNet ground. instruNet ground = instruNet chassis = earth ground via power supply 3rd prong
Crosstalk < -80dB typ Crosstalk from one channel to another depends on sample rate and frequency of applied signal, and is typically < -80dB; i.e. -80dB = 20 * log (1 / 10000). For example, one can apply a 10Hz 10Vpp sinewave to Ch1 on the ±5Vrange, apply 0 Volts DC to Ch3 on the ±2.5Vrange, digitize both at the maximum sample rate, and see < 1mVpp sinewave on Ch3, in a typical case. The amplitude of this sinewave would decrease with slower sample rates, and increase with higher sinewave frequencies.
Input Coupling DC Measure constant DC voltage or dynamic AC waveform with absolute voltage accuracy
Input Impedance 100MΩ Internal 100MΩ resistor (5% accuracy) between input pin and instruNet ground reduces fluctuating measurements when input pin is left unconnected
Current Pump 60 pC max Internal multiplexors pump a small amount of current out voltage measurement pin and into the end user circuit when channels switch. This is normal for multiplexors (they all do this), and is automatically mitigated when doing sensor measurements by waiting for current to dissipate before taking the measurement. If you don't like multiplexors, or need fast sample rates with low level signals; please see i423 which routes inputs to instrumentation amplifiers instead of multiplexors.
Input leakage current 2.8 nA max at 37°C This is a small current that flows out the voltage input pin and into the end user circuit. It has little effect unless measuring small voltages (e.g. expecting accuracy better than ±100uV) with a high source impedance (e.g. > 2K Ω). Maximum leakage is 2.8 nA at 37°C, and 1.4 nA at 25°C.
Input Circuit Multiplexer Voltage input pin connects directly to internal protected multiplexer IC
Common Mode Rejection Ratio ≥ 74dB CMRR is the amount of rejection of a common signal that is present on both inputs of a differential measurement. Theoretically, it should not be measured because the differential measurement looks at the voltage between two pins; however small internal imbalances cause a small error, which is specified here with a DC to 60Hz common mode signal.
Calibration Software Control instruNet hardware is calibrated66 when the system is reset (i.e. press RESET button, load .prf configuration file, or start instruNet software), and when the system is software calibrated (i.e. press CALIBRATE button, issue software calibrate command, or set up software to calibrate every X minutes59 ).
Front End Schematics Published Schematics: Hd44 Connector,  20x Vin Mux

 

Software Interface, Analog Voltage Input, iNet-420

 

Parameter Specifications19 Notes
Software Interface Windows Compatible instruNet Scalar I/O and High Speed I/O60 interface subroutines execute on Windows Computer via instruNet World, Visual Basic, C, Labview, or DasyLab software. Scalar I/O reads or writes 1 value at a time; whereas High Speed I/O reads or writes multiple values (i.e. a waveform) at a fixed rate (i.e. sample rate).
Maximum # of Channels Up to 256 instruNet system (iNet32/64.dll ≥ v3.0) supports simultaneous high speed I/O to/from computer with 1 to 256 I/O channels70
Maximum Waveform Size Limited by Computer Continuously digitize into Windows computer RAM or into file on Windows computer hard disk62 . Maximum file size is limited by available space on hard disk. Data consumes 4 bytes per point.
Scalar I/O Benchmark 50 to 300uSec typ Scalar I/O60 typically requires 50 to 300uSec to read 1 value from 1 voltage input channel with 0 mSec of a/d averaging. This increases by the amount of a/d averaging (e.g. 1050 to 1300uSec for 1mSec of a/d averaging)
Software Channels Ch1 Vin+ ... Ch20 Vin- Channels #1...#20:  SE/DI voltage inputs, ±20mV...±10V
Connector Pins One pin per bit Signals are available at Hd44 connector pins: #1...#20217
Ground Reference Hd44 Pins 29/42/43/44 instruNet ground = instruNet chassis = earth ground via power supply 3rd prong

 



 
4x Universal Digital I/O, 20mA sink, iNet-420

 

Parameter Specifications19 Notes
Description 4 Bidirectional Digital I/O The 20mA sink digital I/O port consists of 4 individual TTL-compatible lines (Ch#25...#28), each of which can be configured as: digital input bit, digital output bit, control output, clock output. When configured as an input, a channel can be used to sense a digital high (2.1 to 30 Volts) or digital low (-10V to .65Volts). When configured as an output, a channel can be set high (e.g. >2V) or low (e.g. <0.8V). These I/O pins are short-circuit protected against high voltages up to 32.0V and down to -16.0V.
Function Multiple Options Software programmed to one of: digital input bit, digital output bit, control output, clock output. Clock output options are: 24MHz, 12MHz24 , 6MHz, 1.5MHz, 1MHz, 375KHz, 100KHz, 94KHz, 23KHz, 10KHz, 5.9KHz, 1.5KHz, 1KHz, 366Hz, 100Hz, 92Hz, 23Hz, 10Hz, 5.7Hz, 1.4Hz, 1Hz, 0.358Hz, 0.0894Hz. Control output options are: pulse low when rd/wr to Uio 25..28 port, pulse low when read from Uio 25..28 port, pulse low when in software reset or power is off.
Maximum Sample Rate17 166Ks/sec/aggregate Input70 digital data at a maximum sample rate of 166K sample/sec for 1 channel. More channels involve slower rates, e.g. 83Ks/sec per channel for 2 channels, 41Ks/sec/ch for 4 channels, and 20Ks/sec/ch for 8 channels. Things that decrease High Speed I/O sample rate: longer computer to instruNet cable, i330 optical-isolator. Sample rate is set accurate to 50 ppm (e.g. user specifies 20000 s/sec yet system actually digitizes at 20001 s/sec). Minimum sample rate is 0.015 samples/sec/ch.
Maximum Update Rate 41Ks/sec for 1ch Update 1 output channel at 41K sample/sec. More channels involve slower rates, e.g. 27K sample/sec per channel for 2 output channels
TTL Compatible Yes Supports 0.8V for logic 0 and 2V for logic 1, which is typical for TTL
3.3V CMOS Compatible " Supports 1.1V (3.3V*.35) for logic 0 and 2.3V (3.3V*.7) for logic 1, which is typical for digital Cmos powered by 3.3V
5V CMOS Compatible " Supports 1.75V (5V*.35) for logic 0 and 3.5V (5V*.7) for logic 1, which is typical for digital Cmos powered by 5V
Drive Relay Directly " Wire one side of external relay coil to power supply (e.g. 5V), wire other side to I/O pin, and output logic 0 to turn on relay
Detect Switch Closure " Wire one side of external switch to gnd, wire other side to I/O pin, input logic 0 when switch is closed, and input logic 1 when switch is open

 

Electrical Specifications, Universal Digital I/O, iNet-420

 

Parameter Specifications19 Notes
Working Voltage -10 to +30V Functions properly when working with -10 to +30V between the I/O pin and instruNet gnd, where each bit is set up as an input or output
Protected Voltage -16 to +32V Short any combination of I/O pins to external -16 to +32V power source (i.e. capable of high current), set up as input or output (0 or 1), instruNet power on or off, without damage
Fuse Auto-Reset, 30 Milliamp Internal fuse on each I/O pin opens during > 30mA over-current condition, and automatically closes otherwise
"0" Input Voltage -10 to +0.65V Applying -10 to +0.65V is read as logic 0 when I/O pin is configured as input
"0" Input Current Amps = (4.5V - Vin) / 3900 External signal must sink internal 3.9K resistor to < 0.65V to input logic quot;0". 3.9KΩ pull-up resistor is internally attached to 5V via diode
"1" Input Voltage +2.1 to +30V Applying +2.1 to +30V is read as logic 1 when I/O pin is configured as input. If left unconnected this pin floats to 4.5V.
"1" Input Current < 1.4mA Vin < 4.5V: Amps = (4.5V - Vin) / 3900
Vin > 4.5V: Amps = (Vin - 3.3V) / 22000
"0" Output Voltage < 0.8V @ <5mA,
< 2V @ < 20mA		 I/O pin configured as an output sinks current low to 0.3V...0.8V with 0 to 5mA load; or sinks low to 0.3V...2V with 5 to 20mA load
"1" Output Voltage 3.9V...4.5V I/O pin floats to 3.9V...4.5V via internal 3.9K pull-up resistor connected to internal 5V via diode
"1" Output Current See "1" Input Current Outputting a 1 is the same as configuring the bit as an input; see "1" Input Current, above, for details
Pull-Up Resistor 3.9KΩ ±10% Internal 3.9K resistor pulls pin up to 4.5V via diode (little current flows if pin voltage > 4.5V)
Current Sink IC ULN2003 See www.ti.com for details on this npn transistor that sinks current low to gnd
Schmitt Trigger Input Yes Insures that a slow moving input signal with noise is not seen as vibrating between 0 and 1 when transitioning between the two
Input Delay < 0.7 uSec Schmitt trigger circuit adds < 0.7uSec delay between voltage at I/O pin, and internal version of digital input
Output Fall Time 0.02 uSec @ 100 pF typ,
< 1.3 uSec @ 1K pF		 Output transitions from 2V to 0.8V in approximately 0.02uSec with 100 pF of capacitive load
Output Rise Time 1.3 uSec @ 100 pF typ,
< 4.9 uSec @ 1K pF		 Output transitions from 0.8V to 2V in approximately 1.3uSec with 100 pF of capacitive load. To reduce this time significantly, attach a resistor (e.g. 1K Ω) between I/O pin and +5Vpwr pin24
Output Oscillation None Output will not oscillate with any capacitive load
Front End Schematics Published Schematics: Hd44 Connector,  4x Uio_A Bits

 

Software Interface, Universal Digital I/O, iNet-420

 

Parameter Specifications19 Notes
Software Interface Windows Compatible instruNet Scalar I/O and High Speed I/O60 interface subroutines execute on Windows Computer via instruNet World, Visual Basic, C, Labview, or DasyLab software. Scalar I/O reads or writes 1 value at a time; whereas High Speed I/O reads or writes multiple values (i.e. a waveform) at a fixed rate (i.e. sample rate).
Maximum # of Channels Up to 256 instruNet system (iNet32/64.dll ≥ v3.0) supports simultaneous high speed I/O to/from computer with 1 to 256 I/O channels70
Maximum Waveform Size Limited by Computer Continuously input into Windows computer RAM or into file on Windows computer hard disk62 . Maximum file size is limited by available space on hard disk. Data consumes 4 bytes per point.
Scalar I/O Benchmark 50 to 300uSec typ Scalar I/O60 typically requires 50 to 300uSec to R/W 1 value to/from 1 bit or a bank of multiple I/O bits
Bit or Bank Control Yes Either R/W one bit (0 or 1 value) at a time, or R/W multiple bits within one bank (e.g. 0...255 value with one 8bit bank)
Latching I/O " Internal register reads all input bits within one bank at same time, and updates all output bits within one bank at same time
Bit Software Channels Ch25 Uio ... Ch28 Uio
 Channels #25...#28: universal I/O bits, 0 or 1 value, scalar input/output, no high speed i/o, 20mA sink
Bank Software Channels Uio25_28 In
Uio25_28 Out
 Channel #29: bank of 4 bits, 0...15 value, scalar input/output, high speed input
Channel #30: bank of 4 bits, 0...15 value, scalar input/output, high speed output
Connector Pins One pin per bit Signals are available at Hd44 connector pins: #25...#28217
Ground Reference Hd44 Pins 29/42/43/44 instruNet ground = instruNet chassis = earth ground via power supply 3rd prong

 



 
I/O Software Channels, iNet-420

 

ChNum Name Channel Type Hd44 Pin(s) Description Scalar I/O
Support		 High Speed
Digitize Support
#1 Ch1 Vin+ SE/DI Voltage Input 1, 2 ±20mV...±10V input input
#2 Ch2 Vin- SE Voltage Input 2 " " "
#3 Ch3 Vin+ SE/DI Voltage Input 3, 4 " " "
#4 Ch4 Vin- SE Voltage Input 4 " " "
#5 Ch5 Vin+ SE/DI Voltage Input 5, 6 " " "
#6 Ch6 Vin- SE Voltage Input 6 " " "
#7 Ch7 Vin+ SE/DI Voltage Input 7, 8 " " "
#8 Ch8 Vin- SE Voltage Input 8 " " "
#9 Ch9 Vin+ SE/DI Voltage Input 9, 10 " " "
#10 Ch10 Vin- SE Voltage Input 10 " " "
#11 Ch11 Vin+ SE/DI Voltage Input 11, 12 " " "
#12 Ch12 Vin- SE Voltage Input 12 " " "
#13 Ch13 Vin+ SE/DI Voltage Input 13, 14 " " "
#14 Ch14 Vin- SE Voltage Input 14 " " "
#15 Ch15 Vin+ SE/DI Voltage Input 15, 16 " " "
#16 Ch16 Vin- SE Voltage Input 16 " " "
#17 Ch17 Vin+ SE/DI Voltage Input 17, 18 " " "
#18 Ch18 Vin- SE Voltage Input 18 " " "
#19 Ch19 Vin+ SE/DI Voltage Input 19, 20 " " "
#20 Ch20 Vin- SE Voltage Input 20 " " "
#25 Ch25 Uio One Uio Bit 25 0 or 1, 20mA sink input/output no high speed i/o
#26 Ch26 Uio " 26 " " "
#27 Ch27 Uio " 27 " " "
#28 Ch28 Uio " 28 " " "
#29 Uio25_28 In Group of Uio Bits 25...28 0...15 " input
#30 Uio25_28 Out " " " " output

 



 
Hd44 Connector Pins, iNet-420

 

Hd44 Pin# Pin Name Pin Type Description
#1 Ch1 Vin+ SE/DI+ Voltage In Supported Sensors: Voltage,  Thermocouple,  Thermistor,  RTD,  Load Cell,  Strain Gage,  Potentiometer,  Current,  Resistance
#2 Ch2 Vin- SE/DI- Voltage In "
#3 Ch3 Vin+ SE/DI+ Voltage In "
#4 Ch4 Vin- SE/DI- Voltage In "
#5 Ch5 Vin+ SE/DI+ Voltage In "
#6 Ch6 Vin- SE/DI- Voltage In "
#7 Ch7 Vin+ SE/DI+ Voltage In "
#8 Ch8 Vin- SE/DI- Voltage In "
#9 Ch9 Vin+ SE/DI+ Voltage In "
#10 Ch10 Vin- SE/DI- Voltage In "
#11 Ch11 Vin+ SE/DI+ Voltage In "
#12 Ch12 Vin- SE/DI- Voltage In "
#13 Ch13 Vin+ SE/DI+ Voltage In "
#14 Ch14 Vin- SE/DI- Voltage In "
#15 Ch15 Vin+ SE/DI+ Voltage In "
#16 Ch16 Vin- SE/DI- Voltage In "
#17 Ch17 Vin+ SE/DI+ Voltage In "
#18 Ch18 Vin- SE/DI- Voltage In "
#19 Ch19 Vin+ SE/DI+ Voltage In "
#20 Ch20 Vin- SE/DI- Voltage In "
#21 Internal_21 Internal Use Only Pin is used by manufacturer for product testing, please do not touch
#22 Internal_22 " "
#23 Internal_23 " "
#24 Internal_24 " "
#25 Ch25 Uio One Uio Bit universal I/O bits, 0 or 1 value, scalar input/output, no high speed i/o, 20mA sink, -10V..30V
#26 Ch26 Uio " "
#27 Ch27 Uio " "
#28 Ch28 Uio " "
#29 Gnd instruNet Ground instruNet ground = instruNet chassis = earth ground via power supply 3rd prong
#30 Internal_30 Internal Use Only Pin is used by manufacturer for product testing, please do not touch
#31 Internal_31 " "
#32 Internal_32 " "
#33 Internal_33 " "
#34 3.3Vref +3.3V ±0.2V, <220mA Power Available to End User
#35 " " "
#36 5Vpwr +5V ±0.5V, <220mA Power Available to End User
#37 " " "
#38 12Vpwr +12V ±1.2V, <220mA Power Available to End User
#39 " " "
#40 -12Vpwr -12V ±1.2V, <220mA Power Available to End User
#41 " " "
#42 Gnd instruNet Ground instruNet ground = instruNet chassis = earth ground via power supply 3rd prong
#43 " " "
#44 " " "

 



 
Power Available to End User, iNet-420

 

Parameter Specifications19 Notes
Description External Power +3.3V, +5V, +12V, and -12V power (< 300mA) is available to the end user at several Hd44 Connector217 pins.
+3.3V Reference Pwr +3.3V ±0.2V, <220mA +3.3Vdc power available to end user at Hd44 connector pins 34 and 35
+5V End User Pwr +5V ±0.5V, <220mA +5Vdc power available to end user at Hd44 connector pins 36 and 37
+12V End User Pwr +12V ±1.2V, <220mA +12Vdc power available to end user at Hd44 connector pins 38 and 39
-12V End User Pwr -12V ±1.2V, <220mA -12Vdc power available to end user at Hd44 connector pins 40 and 41
Fuse Auto-Reset, > .35Amp Internal fuse on each power voltage opens during >.35A over-current condition, and automatically closes otherwise

 



Physical/Environmental Specifications, iNet-420

 

Parameter Specifications19 Notes
I/O Connector HD44 male High density 44 pin male connector217 (e.g. Astron #HD6C-44-AMAN-1G213 , click footnote for datasheet, outer shell is same size as DB25)
Wiring Box Compatible Compatible with the following optional wiring boxes: i510,  i511,  i512
Physical Dimensions 5.3" x 5.13" x 1" Standard instruNet i4xx card, 134.6mm x 130.3mm x 25.4mm
Operating Temp. 1 to 45°C Operate in temperature between 1°C and 45°C, no condensation
Storage Temperature -20 to 70°C Store in ambient temperature between -20°C and +70°C
Relative Humidity ≤ 90% Operate in humidity less than 90%, no condensation
Hot Plug & Play Yes One can attach device with power on or off, without damage
Safety IEC, EN, UL, CSA Designed to meet IEC 61010-1, EN 61010-1, UL 61010-1, CSA 61010-1
Emissions EN, CE, FCC Designed to meet EN 61326 EMC Min Immunity, EN 55011 Emissions Group 1 Class A, CE, C-tick, ICES, and FCC Part 15 Emissions Class A
CE Compliance Yes Meets 73/23/EEC low-voltage safety, and 89/336/EEC electromagnetic compatibility
Specifications Subject to change All specifications are subject to change without notice
+5Vdc Requirement +5V ±0.4V, ~150mA Power required to operate module (not for sensors or end user power)
+12Vdc Requirement +12V ±0.8V, ~50mA "
-12Vdc Requirement -12V ±0.8V, ~25mA "

 



 
Voltage Measurement
Absolute Accuracy Specifications, iNet-420

 

Voltage
Range 1 		Signal
Averaging Per Point
(mSec) 3 		Absolute Accuracy
(Max Gain + Offset Error) 38a 		Max Multi-
Channel Aggregate Sample Rate (s/sec/agg) 18 		Channel Switching Acquisition Time
(uSec) 4 		Analog Amplifier Bandwidth
(KHz) 5
±10V 0 mSec ±(0.017% + 1408.0μV) 94.40K 10.6 234
  0.1 mSec ±(0.017% + 875.9μV) 6.41K 10.6 234
  1.0 mSec ±(0.017% + 671.6μV) 0.78K 10.6 234
±5V 0 mSec ±(0.017% + 850.9μV) 90.14K 11.1 241
  0.1 mSec ±(0.017% + 499.3μV) 6.41K 11.1 241
  1.0 mSec ±(0.017% + 364.3μV) 0.78K 11.1 241
±2.5V 0 mSec ±(0.017% + 652.8μV) 83.55K 12.0 249
  0.1 mSec ±(0.017% + 399.1μV) 6.41K 12.0 249
  1.0 mSec ±(0.017% + 290.7μV) 0.78K 12.0 249
±80mV 0 mSec ±(0.015% + 19.0μV) 2.31K 369.3 12
  0.1 mSec ±(0.015% + 11.9μV) 1.81K 369.3 12
  1.0 mSec ±(0.015% + 10.3μV) 0.60K 369.3 12
±40mV 0 mSec ±(0.015% + 15.5μV) 2.19K 386.0 12
  0.1 mSec ±(0.015% + 9.3μV) 1.74K 386.0 12
  1.0 mSec ±(0.015% + 8.0μV) 0.59K 386.0 12
±20mV 0 mSec ±(0.015% + 14.6μV) 2.14K 402.7 12
  0.1 mSec ±(0.015% + 8.7μV) 1.70K 402.7 12
  1.0 mSec ±(0.015% + 7.4μV) 0.58K 402.7 12
0 to 10V 0 mSec ±(0.017% + 850.9μV) 90.14K 11.1 241
  0.1 mSec ±(0.017% + 499.3μV) 6.41K 11.1 241
  1.0 mSec ±(0.017% + 364.3μV) 0.78K 11.1 241
0 to 5V 0 mSec ±(0.017% + 652.8μV) 86.37K 11.6 249
  0.1 mSec ±(0.017% + 391.1μV) 6.41K 11.6 249
  1.0 mSec ±(0.017% + 290.7μV) 0.78K 11.6 249

 

Voltage Specification Conditions, iNet-420
  • The iNet-420 module supports quantity 10 Voltage devices wired Differential or 20 wired Single-Ended.
  • Absolute Accuracy is specified as a percentage of measured value PLUS a fixed offset. It is the sum of the following errors components, each in their worst case (we are conservative): Intergal Nonlinearity (INL), Differential Nonlinearity (DNL), system noise (ground input, digitize, and see noise), gain/offset temperature drift, gain/offset time stability drift, gain/offset initial offset error, 2.8nA max leakage current (at 37°C) times 50Ω user source impedance error, and voltage reference temperature/time drift 66 . Noise offset error is modeled as 3 times the Noise RMS value (99.7%). Absolute Accuracy is the same as Maximum Worst Case error. For Typical error, divide maximum by 2.
  • Absolute accuracy is shown with both a gain and offset component, where the offset error is independent of the input voltage, and the gain error is porportional to the the input. For example, if one measures 2Volts and the absolute accuracy specification is ±(1% + 3mV), then one could expect ±(1% * 2V + 3mV) = ±23mV accuracy.
  • These specifications assume the external end user source resistance is <50 Ω (op amp source); and the external end user source capacitance to GND is < 1000 pF.
 
  • Calibration: These specifications assume 1 year since Factory Calibration, instruNet hardware ambient temperature is between 13 and 33 °C, and instruNet hardware temperature changed 1°C since its last self-calibration 59 .

Software Programmable Parameters
Each channel provides the following independently programmable parameters:
  • A/D Signal-Averaging-Per-Point (0 ... 100mSec) 3
  • Sample-Rate (samples-per-second-per-channel) 17
  • Digital IIR Filter (LowPass, HighPass, BandPass, or BandStop) 55
  • Voltage Measurement Range (±20mV...±10V) 1
  • Sensor Type 13
  • Single-Ended or Differential Wiring

More Information


 
Voltage Measurement
Drift Errors, iNet-420

 

Voltage
Range 1 		Absolute Accuracy
(Max Gain + Offset Error) 38a 		Additional Error Per °C If Operate Hardware at >33°C or <13°C 7 Additional Error Per Year if Not Factory Calibrate Hardware After 1Yr 9 Additional Error per °C if not AutoCal after 1°C Hardware Change Since last AutoCal 8
±10V ±(0.017% + 671.6μV) ±0.0008%/°C ±0.0035%/yr ±(0.0013% + 241.3μV)/°C
±5V ±(0.017% + 364.3μV) ±0.0008%/°C ±0.0035%/yr ±(0.0013% + 131.3μV)/°C
±2.5V ±(0.017% + 290.7μV) ±0.0008%/°C ±0.0035%/yr ±(0.0013% + 76.3μV)/°C
±80mV ±(0.015% + 10.3μV) ±0.0005%/°C ±0.0025%/yr ±(0.0048% + 2.4μV)/°C
±40mV ±(0.015% + 8.0μV) ±0.0005%/°C ±0.0025%/yr ±(0.0048% + 1.5μV)/°C
±20mV ±(0.015% + 7.4μV) ±0.0005%/°C ±0.0025%/yr ±(0.0048% + 1.1μV)/°C
0 to 10V ±(0.017% + 364.3μV) ±0.0008%/°C ±0.0035%/yr ±(0.0013% + 131.3μV)/°C
0 to 5V ±(0.017% + 290.7μV) ±0.0008%/°C ±0.0035%/yr ±(0.0013% + 76.3μV)/°C

 



 
Thermocouple Measurement
Absolute Accuracy Specifications, iNet-420

 

TC
Type 13 		Measurement
Range 11 		Voltage
Range 1 		Absolute
Accuracy
(±Max Error) 38w 		Max Multi-
Channel Aggregate Sample Rate (s/sec/agg) 18
J -210 to 150°C ±20mV
-10 to 150°C: ±0.74°C
 1.70K
   
-210 to -10°C: ±1.05°C
 i423 is faster
  -210 to 1200°C ±80mV
10 to 1200°C: ±0.94°C
 1.81K
   
-210 to 1200°C: ±1.21°C
K -200 to 200°C ±20mV
-10 to 120°C: ±0.80°C
 1.70K
   
±200°C: ±1.18°C
  -200 to 1360°C ±80mV
10 to 1360°C: ±1.18°C
 1.81K
   
-200 to 1360°C: ±1.37°C
B 251 to 1820°C ±20mV
251 to 600°C: ±3.78°C
 1.70K
   
600 to 1300°C: ±2.03°C
   
251 to 1300°C: ±3.78°C
   
1300 to 1820°C: ±1.49°C
C 0 to 1K°C ±20mV
 ±1.65°C
 1.70K
  0 to 2315°C ±40mV
 ±2.62°C
 1.74K
D 0 to 1K°C ±20mV
 ±1.87°C
 1.70K
  0 to 2315°C ±40mV
 ±2.64°C
 1.74K
E -200 to 125°C ±20mV
-90 to 80°C: ±0.75°C
 1.70K
   
-200 to 125°C: ±0.94°C
  -200 to 1K°C ±80mV
10 to 1K°C: ±0.85°C
 1.81K
   
-200 to 1K°C: ±1.06°C
G 0 to 500°C ±20mV
0 to 500°C: ±5.09°C
 1.70K
   
100 to 500°C: ±2.75°C
  0 to 2315°C ±40mV
0 to 300°C: ±5.37°C
 1.70K
   
300 to 2315°C: ±1.98°C
N -200 to 570°C ±20mV
-200 to 0°C: ±1.45°C
 1.70K
   
0 to 170°C: ±0.91°C
   
-10 to 570°C: ±0.91°C
  -200 to 1300°C ±80mV
10 to 1300°C: ±1.08°C
 1.81K
   
-200 to 1300°C: ±1.74°C
R -50 to 800°C ±20mV
-50 to 10°C: ±2.76°C
 1.70K
   
10 to 800°C: ±2.03°C
  -50 to 1768°C ±40mV
10 to 1768°C: ±2.14°C
 1.74K
   
-50 to 1768°C: ±2.91°C
S -50 to 1768°C ±20mV
-50 to -10°C: ±2.56°C
 1.70K
   
-10 to 860°C: ±2.16°C
   
-50 to -10°C: ±2.56°C
   
-10 to 1768°C: ±2.16°C
T -200 to 175°C ±20mV
-200 to -10°C: ±1.14°C
 1.70K
   
-10 to 175°C: ±0.79°C
  -200 to 400°C ±40mV
10 to 400°C: ±0.79°C
 1.74K
   
-200 to 400°C: ±1.18°C

 

Thermocouple Specification Conditions, iNet-420
  • The iNet-420 module supports quantity 10 Thermocouple devices wired Differential (not SE).
  • Absolute Accuracy is specified as a percentage of measured value PLUS a fixed offset. It is the sum of the following errors components, each in their worst case (we are conservative): voltage measurement errors as described above, cold junction compensation (supplied automatically by instrunet) error, polynomial linearization error, 0.2°C instrunet screw terminal temperature change since last autocalibration, multiplexor current pump error. Absolute Accuracy does Not include errors from the actual Thermocouple device. Absolute Accuracy is the same as Maximum Worst Case error. For Typical error, divide maximum by 2.
  • These specifications assume signal averaging per point is 0.1mSec Integ for all rows3 .
  • Measurement of thermocouples Requires that an i51x Wiring Box be attached to the i4xx Module, and that the thermocouple leads are attached directly to the i51x screw terminals (for automatic Cold Junction Compensation).
  • The measured thermocouple temperature is a function of the instruNet hardware screw terminal temperature and the voltage measured across the thermocouple. Therefore, an additional temperature measurement error of 1°C occurs for each 1°C change of the instruNet screw terminal temperature since the last instruNet auto-calibration (where it measures screw terminal temperature) 59 . For example, if the instruNet hardware auto-calibrates when it's screw terminals are at 23°C, and they then heat up 3°C before another auto-calibration, then all thermcouple measurements will return a temperature that is 3°C higher than expected. One can program the instruNet to auto-calibrate once every 1 to 1000 minutes.
 
  • These specifications assume the thermocouple device is grounded at the instruNet (e.g. the end user connects an external wire between the i51x Vin Minus (Vin-) and GND screw terminals).
  • Calibration: These specifications assume 1 year since Factory Calibration, instruNet hardware ambient temperature is between 13 and 33 °C 59 .

Software Programmable Parameters
Each channel provides the following independently programmable parameters:
  • A/D Signal-Averaging-Per-Point (0 ... 100mSec) 3
  • Sample-Rate (samples-per-second-per-channel) 17
  • Digital IIR Filter (LowPass, HighPass, BandPass, or BandStop) 55
  • Voltage Measurement Range (±20mV ... ±80mV) 1
  • Sensor Type 13
  • Min/Max °C Range 11

More Information


 
Thermistor Measurement
Absolute Accuracy Specifications, iNet-420

 

Thermistor
Type
(Ω @ 25°C) 23 		Measurement
Range 11 		Voltage
Range 1 		Absolute
Accuracy
(±Max Error) 38n 		Max Multi-
Channel Aggregate Sample Rate (s/sec/agg) 18 		External Shunt Resistor
(Ω) 15 		Shunt Resistor Initial Accuracy
(%) and Temp Drift
(ppm/C) 16 		Example Shunt
Resistor Product 100
2252 Ω 0 to 130°C ±2.5V
10 to 30°C: ±0.27°C
 5.95K 10K Ω 0.05%, 5ppm/C #iNet-R-10K
eg #44004 i423 has more range  
30 to 70°C: ±0.19°C
 i423 is faster      
   
70 to 130°C: ±0.72°C
      
   
0 to 70°C: ±0.31°C
      
  90 to 250°C ±80mV
 ±1.05°C
 1.49K 10K Ω 0.05%, 5ppm/C #iNet-R-10K
  30 to 250°C ±2.5V
30 to 170°C: ±2.09°C
 5.95K 10K Ω 0.05%, 5ppm/C #iNet-R-10K
   
170 to 250°C: ±10.72°C
      
  30 to 70°C  
 ±0.18°C
 5.95K 10K Ω 0.01%, 5ppm/C contact disti

 

Thermistor Specification Conditions, iNet-420
  • The iNet-420 module supports quantity 10 Thermistor devices wired Differential or 20 wired Single-Ended.
  • Absolute Accuracy is specified as a percentage of measured value PLUS a fixed offset. It is the sum of the following errors components, each in their worst case (we are conservative): voltage measurement errors as described above, readback of excitation voltage error, sensor self heating error, external shunt resistor self heating error, external shunt resistor initial accuracy error, instruNet input impedance variation error, 2.8nA max leakage current (at 37°C) times user source impedance error, polynomial linearization error, multiplexor current pump error. Absolute Accuracy does Not include errors from the actual Thermistor device. Absolute Accuracy is the same as Maximum Worst Case error. For Typical error, divide maximum by 2.
  • These specifications assume signal averaging per point is 0.1mSec Integ for all rows3 .
  • instruNet connects directly to all types of Thermistor's.
  • The end user must supply one external shunt resistor per channel (i.e. this resistor is not included with i4xx or i51x products).
  • The end user must supply Steinhart a/b/c coefficients, unless working with YSI/Omega 4xx or 4xxxx series thermistors 23 .
  • These specifications assume that less than 1000 pF of external capacitance is between the end user source and GND.
  • instruNet provides a fixed 3.3V excitation voltage which is accurately readback in order to calculate °C.
  • These specifications assume an i51x Wiring Box is attached to the i4xx Module, and that the device leads are attached to the i51x screw terminals (for accurate readback of 3.3Vref). The i51x can be attached directly to the i4xx front panel; or a cable can be placed between the i4xx and i51x wiring box (e.g. ≤ 5meters, 44 wire, point-to-point) without degradation of accuracy.
  
  • Calibration: These specifications assume 1 year since Factory Calibration, instruNet hardware ambient temperature is between 13 and 33 °C, and instruNet hardware temperature changed 1°C since its last self-calibration 59 .

Software Programmable Parameters
Each channel provides the following independently programmable parameters:
  • A/D Signal-Averaging-Per-Point (0 ... 100mSec) 3
  • Sample-Rate (samples-per-second-per-channel) 17
  • Digital IIR Filter (LowPass, HighPass, BandPass, or BandStop) 55
  • Voltage Measurement Range (±20mV ... ±10V) 1
  • Sensor Type 23
  • Min/Max °C Range 11
  • Single-Ended or Differential Wiring
  • External End-User-Supplied Shunt Resistor resistance (Ω) 15
  • Device Steinhart-Hart a/b/c coefficients

More Information


 
RTD Measurement
Absolute Accuracy Specifications, iNet-420

 

RTD
Type
(Ω @ 0°C) 13 		Measurement
Range 11 		Voltage
Range 1 		Absolute
Accuracy
(±Max Error) 38e 		Max Multi-
Channel Aggregate Sample Rate (s/sec/agg) 18 		External Shunt Resistor
(Ω) 15 		Shunt Resistor Initial Accuracy
(%) and Temp Drift
(ppm/C) 16 		Example Shunt
Resistor Product 100
100 Ω ±50°C ±40mV
 ±0.48°C
 1.44K 10K Ω 0.05%, 5ppm/C #iNet-R-10K
  -100 to 300°C ±80mV
-100 to 150°C: ±0.61°C
 1.49K 10K Ω 0.05%, 5ppm/C #iNet-R-10K
   
150 to 300°C: ±0.79°C
 i423 is faster      
  -238 to 850°C ±2.5V
-238 to 0°C: ±3.13°C
 1.44K 10K Ω 0.05%, 5ppm/C #iNet-R-10K
   
0 to 100°C: ±3.35°C
      
   
100 to 850°C: ±5.38°C
      
500 Ω -100 to 300°C ±2.5V
 ±1.43°C
 5.95K 10K Ω 0.05%, 5ppm/C #iNet-R-10K
1K Ω -100 to 300°C ±2.5V
 ±1.22°C
 5.95K 10K Ω 0.05%, 5ppm/C #iNet-R-10K
100 Ω -100 to 150°C ±80mV
 ±0.45°C
 1.49K 10K Ω 0.01%, 5ppm/C contact disti

 

RTD Specification Conditions, iNet-420
  • The iNet-420 module supports quantity 10 RTD devices wired Differential or 20 wired Single-Ended.
  • Absolute Accuracy is specified as a percentage of measured value PLUS a fixed offset. It is the sum of the following errors components, each in their worst case (we are conservative): voltage measurement errors as described above, readback of excitation voltage error, sensor self heating error, external shunt resistor self heating error, external shunt resistor initial accuracy error, instruNet input impedance variation error, 2.8nA max leakage current (at 37°C) times user source impedance error, multiplexor current pump error. Absolute Accuracy does Not include errors from the actual RTD device. Absolute Accuracy is the same as Maximum Worst Case error. For Typical error, divide maximum by 2.
  • These specifications assume signal averaging per point is 0.1mSec Integ for all rows3 .
  • instruNet connects directly to all types of RTD's.
  • The end user must supply one external shunt resistor per channel (i.e. this resistor is not included with i4xx or i51x products).
  • These specifications assume that less than 1000 pF of external capacitance is between the end user source and GND.
  • instruNet provides a fixed 3.3V excitation voltage which is accurately readback in order to calculate °C.
  • These specifications assume an i51x Wiring Box is attached to the i4xx Module, and that the device leads are attached to the i51x screw terminals (for accurate readback of 3.3Vref). The i51x can be attached directly to the i4xx front panel; or a cable can be placed between the i4xx and i51x wiring box (e.g. ≤ 5meters, 44 wire, point-to-point) without degradation of accuracy.
  
  • Calibration: These specifications assume 1 year since Factory Calibration, instruNet hardware ambient temperature is between 13 and 33 °C, and instruNet hardware temperature changed 1°C since its last self-calibration 59 .

Software Programmable Parameters
Each channel provides the following independently programmable parameters:
  • A/D Signal-Averaging-Per-Point (0 ... 100mSec) 3
  • Sample-Rate (samples-per-second-per-channel) 17
  • Digital IIR Filter (LowPass, HighPass, BandPass, or BandStop) 55
  • Voltage Measurement Range (±20mV ... ±10V) 1
  • Sensor Type 13
  • Min/Max °C Range 11
  • Single-Ended or Differential Wiring
  • External End-User-Supplied Shunt Resistor resistance (Ω) 15
  • RTD alpha (e.g. 0.0038) and delta (e.g. 1.492) coefficients
  • RTD beta (e.g. 0.11) coefficient when working with temperatures < 0°C

More Information


 
Load Cell Measurement
Absolute Accuracy Specifications, iNet-420

 

Load
Cell
(Max Kg) 13 		Measurement
Range 11 		Absolute
Accuracy
(±Max Error) 38p 		Max Multi-
Channel Aggregate Sample Rate (s/sec/agg) 18 		Voltage
Range 1
10 Kg, 350Ω, 2mV/V @ MaxKg 0 to 10 Kg ±0.008 Kg 1.39K, i423 is faster ±20mV
25 Kg, 350Ω, 2mV/V @ MaxKg 0 to 25 Kg ±0.019 Kg 1.39K ±20mV
100 Kg, 350Ω, 2mV/V @ MaxKg 0 to 100 Kg ±0.077 Kg 1.39K ±20mV
250 Kg, 350Ω, 2mV/V @ MaxKg 0 to 250 Kg ±0.192 Kg 1.39K ±20mV
1000 Kg, 350Ω, 2mV/V @ MaxKg 0 to 1K Kg ±0.770 Kg 1.39K ±20mV
5000 Kg, 350Ω, 2mV/V @ MaxKg 0 to 5K Kg ±3.848 Kg 1.39K ±20mV
100 Kg, 500Ω, 2mV/V @ MaxKg 0 to 100 Kg ±0.080 Kg 1.39K ±20mV
100 Kg, 1000Ω, 2mV/V @ MaxKg 0 to 100 Kg ±0.091 Kg 1.34K ±20mV

 

Load Cell Specification Conditions, iNet-420
  • The iNet-420 module supports quantity 10 Load Cell devices wired Differential (not SE).
  • Absolute Accuracy is specified as a percentage of measured value PLUS a fixed offset. It is the sum of the following errors components, each in their worst case (we are conservative): voltage measurement errors as described above, readback of excitation voltage error, 2.8nA max leakage current (at 37°C) times user source impedance error, multiplexor current pump error. Absolute Accuracy does Not include errors from the actual Load Cell device. Absolute Accuracy is the same as Maximum Worst Case error. For Typical error, divide maximum by 2.
  • These specifications assume signal averaging per point is 0.1mSec Integ for all rows3 .
  • instruNet connects directly to all types of Load Cell's.
  • These specifications assume the device has been calibrated at the 0 point. This "balancing" involves appling 0 force and then telling instruNet to "balance bridges" via a software command. Subsequently, instruNet automatically subtracts this voltage from future measurements.
  • 120Ω devices are typically not used due to excess heating at the device (3.3V / 120Ω = 27mA, 90 mWatts).  ≥ 350Ω devices are preferred (3.3V / 350Ω = 9mA, 31 mWatts).
  • These specifications assume that less than 1000 pF of external capacitance is between the end user source and GND.
  • instruNet provides a fixed 3.3V excitation voltage which is accurately readback in order to calculate Kg.
  • These specifications assume an i51x Wiring Box is attached to the i4xx Module, and that the device leads are attached to the i51x screw terminals (for accurate readback of 3.3Vref). The i51x can be attached directly to the i4xx front panel; or a cable can be placed between the i4xx and i51x wiring box (e.g. ≤ 5meters, 44 wire, point-to-point) without degradation of accuracy.
  
  • Calibration: These specifications assume 1 year since Factory Calibration, instruNet hardware ambient temperature is between 13 and 33 °C, and instruNet hardware temperature changed 1°C since its last self-calibration 59 .

Software Programmable Parameters
Each channel provides the following independently programmable parameters:
  • A/D Signal-Averaging-Per-Point (0 ... 100mSec) 3
  • Sample-Rate (samples-per-second-per-channel) 17
  • Digital IIR Filter (LowPass, HighPass, BandPass, or BandStop) 55
  • Voltage Measurement Range (±20mV ... ±80mV) 1
  • Sensor Type 13
  • Min/Max Kg Range 11
  • Device maximum-Kg-force and mV/V-sensitivity-at-max-force coefficients

More Information


 
Strain Gage Measurement
Absolute Accuracy Specifications, iNet-420

 

Strain
Gage
(ohms) 13 		Measurement
Range 11 		Absolute
Accuracy
(±Max Error) 38d 		Max Multi-
Channel Aggregate Sample Rate (s/sec/agg) 18 		External Ro Resistor
(Ω, temp drift) 15 		Example Shunt
Resistor Product 100 		Voltage
Range 1
350 Ω, ¼ Bridge ±11929 μS ±13.2 μS 1.41K, i423 is faster 350 Ω, 5ppm/C #iNet-R-350 ±20mV
  ±24146 μS ±18.5 μS 1.46K 350 Ω, 5ppm/C #iNet-R-350 ±40mV
  ±49488 μS ±29.9 μS 5.95K 350 Ω, 5ppm/C #iNet-R-350 ±80mV
350 Ω, ½ Bridge Bend ±5894 μS ±5.4 μS 1.41K 350 Ω, 5ppm/C #iNet-R-350 ±20mV
350 Ω, ½ Bridge Axial ±8985 μS ±8.2 μS 1.41K 350 Ω, 5ppm/C #iNet-R-350 ±20mV
350 Ω, Full Br Bend ±2947 μS ±1.6 μS 1.41K (no ext Ro)   ±20mV
350 Ω, Full Br Axial I ±4465 μS ±2.4 μS 1.41K (no ext Ro)   ±20mV
350 Ω, Full Br Axial II ±4479 μS ±2.4 μS 1.41K (no ext Ro)   ±20mV
1K Ω, ¼ Bridge ±11929 μS ±9.3 μS 1.37K 1K Ω, 5ppm/C #iNet-R-1K ±20mV

 

Strain Gage Specification Conditions, iNet-420
  • The iNet-420 module supports quantity 10 Strain Gage devices wired Differential (not SE).
  • Absolute Accuracy is specified as a percentage of measured value PLUS a fixed offset. It is the sum of the following errors components, each in their worst case (we are conservative): voltage measurement errors as described above, readback of excitation voltage error, external shunt resistor self heating error, 2.8nA max leakage current (at 37°C) times user source impedance error, multiplexor current pump error. Absolute Accuracy does Not include errors from the actual Strain Gage device. Absolute Accuracy is the same as Maximum Worst Case error. For Typical error, divide maximum by 2.
  • These specifications assume signal averaging per point is 0.1mSec Integ for all rows3 .
  • instruNet connects directly to all types of Strain Gage's.
  • The end user must supply 2 external shunt resistors if working with a half bridge and 3 external resistors if working with a quarter bridge (i.e. these resistors are not included with i4xx or products).
  • These specifications assume the device has been calibrated at the 0 point. This "balancing" involves appling 0 force and then telling instruNet to "balance bridges" via a software command. Subsequently, instruNet automatically subtracts this voltage from future measurements.
  • 120Ω devices are typically not used due to excess heating at the device (3.3V / 120Ω = 27mA, 90 mWatts).  ≥ 350Ω devices are preferred (3.3V / 350Ω = 9mA, 31 mWatts).
  • These specifications assume that less than 1000 pF of external capacitance is between the end user source and GND.
  • instruNet provides a fixed 3.3V excitation voltage which is accurately readback in order to calculate μS.
 
  • These specifications assume an i51x Wiring Box is attached to the i4xx Module, and that the device leads are attached to the i51x screw terminals (for accurate readback of 3.3Vref). The i51x can be attached directly to the i4xx front panel; or a cable can be placed between the i4xx and i51x wiring box (e.g. ≤ 5meters, 44 wire, point-to-point) without degradation of accuracy.
  • Calibration: These specifications assume 1 year since Factory Calibration, instruNet hardware ambient temperature is between 13 and 33 °C, and instruNet hardware temperature changed 1°C since its last self-calibration 59 .

Software Programmable Parameters
Each channel provides the following independently programmable parameters:
  • A/D Signal-Averaging-Per-Point (0 ... 100mSec) 3
  • Sample-Rate (samples-per-second-per-channel) 17
  • Digital IIR Filter (LowPass, HighPass, BandPass, or BandStop) 55
  • Voltage Measurement Range (±20mV ... ±80mV) 1
  • Sensor Type 13
  • Min/Max μS Range 11
  • External End-User-Supplied Shunt Resistor resistance (Ω) 15
  • Device GF (e.g. 2) and Poisson (e.g. 0.32) coefficients
  • Device to instruNet lead resistance (Ω)

More Information


 
Potentiometer Measurement
Absolute Accuracy Specifications, iNet-420

 

POT
Type
(ohms) 13 		Measurement
Range 11 		Signal
Averaging Per Point
(mSec) 3 		Absolute
Accuracy
(±Max Error) 38q 		Max Multi-
Channel Aggregate Sample Rate (s/sec/agg) 18 		Voltage
Range 1
10K Ω 0 to 1.0Eu 0.1 mSec ±0.000552Eu 2.53K, i423 is faster 0 to 5V
50K Ω 0 to 1.0Eu   ±0.000569Eu 0.74K 0 to 5V

 

Potentiometer Specification Conditions, iNet-420
  • The iNet-420 module supports quantity 10 Potentiometer devices wired Differential (not SE).
  • Absolute Accuracy is specified as a percentage of measured value PLUS a fixed offset. It is the sum of the following errors components, each in their worst case (we are conservative): voltage measurement errors as described above, readback of excitation voltage error, instruNet input impedance variation error, 2.8nA max leakage current (at 37°C) times user source impedance error, multiplexor current pump error. Absolute Accuracy does Not include errors from the actual Potentiometer device. Absolute Accuracy is the same as Maximum Worst Case error. For Typical error, divide maximum by 2.
  • instruNet connects directly to all types of Potentiometer's.
  • These specifications assume that less than 1000 pF of external capacitance is between the end user source and GND.
  • instruNet provides a fixed 3.3V excitation voltage which is accurately readback in order to calculate Eu.
  • These specifications assume an i51x Wiring Box is attached to the i4xx Module, and that the device leads are attached to the i51x screw terminals (for accurate readback of 3.3Vref). The i51x can be attached directly to the i4xx front panel; or a cable can be placed between the i4xx and i51x wiring box (e.g. ≤ 5meters, 44 wire, point-to-point) without degradation of accuracy.
  
  • Calibration: These specifications assume 1 year since Factory Calibration, instruNet hardware ambient temperature is between 13 and 33 °C, and instruNet hardware temperature changed 1°C since its last self-calibration 59 .

Software Programmable Parameters
Each channel provides the following independently programmable parameters:
  • A/D Signal-Averaging-Per-Point (0 ... 100mSec) 3
  • Sample-Rate (samples-per-second-per-channel) 17
  • Digital IIR Filter (LowPass, HighPass, BandPass, or BandStop) 55
  • Voltage Measurement Range (±20mV ... ±10V) 1
  • Sensor Type 13

More Information


 
Current Measurement
Absolute Accuracy Specifications, iNet-420

 

Measurement
Range 11 		Signal
Averaging Per Point
(mSec) 3 		Absolute Accuracy
(Max Gain + Offset Error) 38b 		Max Multi-
Channel Aggregate Sample Rate (s/sec/agg) 18 		External Shunt Resistor
(Ω) 15 		Shunt Resistor Initial Accuracy
(%) and Temp Drift
(ppm/C) 16 		Example Shunt
Resistor Product 100 		Voltage
Range 1
0 to 24mA 0 mSec ±(0.068% + 19.8uA) 69.11K 33 Ω 0.05%, 5ppm/C #iNet-R-33 ±2.5V
  1.0 mSec ±(0.068% + 8.8uA) 0.78K        
±24mA 0 mSec ±(0.068% + 19.8uA) 69.11K        
  1.0 mSec ±(0.068% + 8.8uA) 0.78K        
±12mA 0 mSec ±(0.068% + 5.4uA) 61.72K 120 Ω 0.05%, 5ppm/C #iNet-R-120 ±2.5V
  1.0 mSec ±(0.068% + 2.4uA) 0.78K        
±2.5mA 0 mSec ±(0.068% + 0.7uA) 29.70K 1K Ω 0.05%, 5ppm/C #iNet-R-1K ±2.5V
  0.1 mSec ±(0.068% + 0.4uA) 4.63K        
±1.2mA 0 mSec ±(0.068% + 0.65uA) 29.70K 1K Ω 0.05%, 5ppm/C #iNet-R-1K ±2.5V
  0.1 mSec ±(0.068% + 0.36uA) 4.63K        
±500uA   ±(0.068% + 0.05uA) 2.53K 10K Ω 0.05%, 5ppm/C #iNet-R-10K ±5V
±600uA 0 mSec ±(0.068% + 0.65uA) 29.70K 1K Ω 0.05%, 5ppm/C #iNet-R-1K ±2.5V
  0.1 mSec ±(0.068% + 0.36uA) 4.63K        
±800uA 0 mSec ±(0.067% + 5.44uA) 61.72K 120 Ω 0.05%, 5ppm/C #iNet-R-120 ±2.5V
  0.1 mSec ±(0.067% + 2.96uA) 5.95K        
±120uA   ±(0.069% + 0.036uA) 2.53K 10K Ω 0.05%, 5ppm/C #iNet-R-10K ±2.5V
±80uA   ±(0.067% + 0.012uA) 1.41K 1K Ω 0.05%, 5ppm/C #iNet-R-1K ±80mV
0 to 24mA 0 mSec ±(0.028% + 19.8uA) 69.11K 33 Ω 0.01%, 5ppm/C contact disti ±2.5V
  1.0 mSec ±(0.028% + 8.8uA) 0.78K        

 

Current Specification Conditions, iNet-420
  • The iNet-420 module supports quantity 10 Current devices wired Differential or 20 wired Single-Ended.
  • Absolute Accuracy is specified as a percentage of measured value PLUS a fixed offset. It is the sum of the following errors components, each in their worst case (we are conservative): voltage measurement errors as described above, readback of excitation voltage error, external shunt resistor self heating error, external shunt resistor initial accuracy error, instruNet input impedance variation error, 2.8nA max leakage current (at 37°C) times user source impedance error, multiplexor current pump error. Absolute Accuracy is the same as Maximum Worst Case error. For Typical error, divide maximum by 2.
  • Absolute accuracy is shown with both a gain and offset component, where the offset error is independent of the input voltage, and the gain error is porportional to the the input. For example, if one measures 2Volts and the absolute accuracy specification is ±(1% + 3mV), then one could expect ±(1% * 2V + 3mV) = ±23mV accuracy.
  • The end user must supply one external shunt resistor per channel (i.e. this resistor is not included with i4xx or i51x products).
  • instruNet hardware measures the voltage across an external current shunt resistor. Both sides of this resistor must be within ±5 Volts of instruNet GND at all times.
 
  • These specifications assume that less than 1000 pF of external capacitance is between the end user source and GND.
  • Calibration: These specifications assume 1 year since Factory Calibration, instruNet hardware ambient temperature is between 13 and 33 °C, and instruNet hardware temperature changed 1°C since its last self-calibration 59 .

Software Programmable Parameters
Each channel provides the following independently programmable parameters:
  • A/D Signal-Averaging-Per-Point (0 ... 100mSec) 3
  • Sample-Rate (samples-per-second-per-channel) 17
  • Digital IIR Filter (LowPass, HighPass, BandPass, or BandStop) 55
  • Voltage Measurement Range (±20mV ... ±10V) 1
  • Sensor Type 13
  • Min/Max uA Range 11
  • Single-Ended or Differential Wiring
  • External End-User-Supplied Shunt Resistor resistance (Ω) 15

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Resistance Measurement
Absolute Accuracy Specifications, iNet-420

 

Measurement
Range 11 		Signal
Averaging Per Point
(mSec) 3 		Absolute Accuracy
(Max Gain + Offset Error) 38c 		Max Multi-
Channel Aggregate Sample Rate (s/sec/agg) 18 		External Shunt Resistor
(Ω) 15 		Shunt Resistor Initial Accuracy
(%) and Temp Drift
(ppm/C) 16 		Example Shunt
Resistor Product 100 		Voltage
Range 1
0 to 33 Ω 0 mSec ±(0.136% + 0.199 Ω) 67.51K 1K Ω 0.05%, 5ppm/C #iNet-R-1K ±2.5V
  0.1 mSec ±(0.117% + 0.108 Ω) 5.95K        
0 to 100 Ω 0 mSec ±(0.140% + 0.199 Ω) 67.51K 1K Ω 0.05%, 5ppm/C #iNet-R-1K ±2.5V
  0.1 mSec ±(0.121% + 0.108 Ω) 5.95K        
0 to 330 Ω 0 mSec ±(0.154% + 0.20 Ω) 67.51K 1K Ω 0.05%, 5ppm/C #iNet-R-1K ±2.5V
  0.1 mSec ±(0.133% + 0.11 Ω) 5.95K        
0 to 1K Ω 0 mSec ±(0.197% + 0.20 Ω) 67.51K 1K Ω 0.05%, 5ppm/C #iNet-R-1K ±2.5V
  1.0 mSec ±(0.165% + 0.09 Ω) 0.78K        
0 to 3300 Ω 0 mSec ±(0.197% + 0.7 Ω) 67.51K 3.3K Ω 0.05%, 5ppm/C #iNet-R-3300 ±2.5V
  0.1 mSec ±(0.170% + 0.4 Ω) 5.95K        
0 to 10K Ω   ±(0.282% + 0.4 Ω) 5.95K 3.3K Ω 0.05%, 5ppm/C #iNet-R-3300 ±2.5V
0 to 100 Ω 0 mSec ±(0.100% + 0.199 Ω) 67.51K 1K Ω 0.01%, 5ppm/C contact disti ±2.5V
  0.1 mSec ±(0.081% + 0.108 Ω) 5.95K        

 

Resistance Specification Conditions, iNet-420
  • The iNet-420 module supports quantity 10 Resistance devices wired Differential or 20 wired Single-Ended.
  • Absolute Accuracy is specified as a percentage of measured value PLUS a fixed offset. It is the sum of the following errors components, each in their worst case (we are conservative): voltage measurement errors as described above, readback of excitation voltage error, external shunt resistor self heating error, external shunt resistor initial accuracy error, instruNet input impedance variation error, 2.8nA max leakage current (at 37°C) times user source impedance error, multiplexor current pump error. Absolute Accuracy is the same as Maximum Worst Case error. For Typical error, divide maximum by 2.
  • Absolute accuracy is shown with both a gain and offset component, where the offset error is independent of the input voltage, and the gain error is porportional to the the input. For example, if one measures 2Volts and the absolute accuracy specification is ±(1% + 3mV), then one could expect ±(1% * 2V + 3mV) = ±23mV accuracy.
  • The end user must supply one external shunt resistor per channel (i.e. this resistor is not included with i4xx or i51x products).
  • These specifications assume that less than 1000 pF of external capacitance is between the end user source and GND.
  • instruNet provides a fixed 3.3V excitation voltage which is accurately readback in order to calculate Ω.
  • These specifications assume an i51x Wiring Box is attached to the i4xx Module, and that the device leads are attached to the i51x screw terminals (for accurate readback of 3.3Vref). The i51x can be attached directly to the i4xx front panel; or a cable can be placed between the i4xx and i51x wiring box (e.g. ≤ 5meters, 44 wire, point-to-point) without degradation of accuracy.
  
  • Calibration: These specifications assume 1 year since Factory Calibration, instruNet hardware ambient temperature is between 13 and 33 °C, and instruNet hardware temperature changed 1°C since its last self-calibration 59 .

Software Programmable Parameters
Each channel provides the following independently programmable parameters:
  • A/D Signal-Averaging-Per-Point (0 ... 100mSec) 3
  • Sample-Rate (samples-per-second-per-channel) 17
  • Digital IIR Filter (LowPass, HighPass, BandPass, or BandStop) 55
  • Voltage Measurement Range (±20mV ... ±10V) 1
  • Sensor Type 13
  • Min/Max Ω Range 11
  • Single-Ended or Differential Wiring
  • External End-User-Supplied Shunt Resistor resistance (Ω) 15

More Information