This A/D module provides 16se/8di voltage input channels (Ch#1...#16)40
, each of which are independently software programmable with Windows software that support the direct connection to many common sensor types
Voltage input range on each channel is independently software programmable to one of: ±10mV, ±20mV, ±40mV, ±80mV, ±600mV, ±1.2V, ±2.5V, ±5V, ±10V20
, 0 to 1.2V, 0 to 2.5V, 0 to 5V
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 (±10mV...±10V20
)1
, Sensor Type13
, and Single-Ended or Differential Wiring
Excitation power (+3.3V ±0.2V, <220mA, 28mA 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.
This module provides 2 channels (Ch#19...#20) that can output a voltage between -10.1 and +10.1V accurate to ±4mV41
. An internal 14-bit d/a converter is followed by an amplifier that can drive up to ±4 mA of current and drive up to 10K pF of capacitance. Each output is short-circuit protected against -18 to +18V, power on or off, without damage
This module provides 2 channels (Ch#17...#18) that can output a voltage between 0 and +10.1V accurate to ±78mV42
. An internal 8-bit d/a converter is followed by an amplifier that can drive up to ±4 mA of current and drive up to 10K pF of capacitance. Each output is short-circuit protected against -18 to +18V, power on or off, without damage
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.
16se/8di Voltage Input Channels with extremely accurate 24-bit A/D Converter29
This A/D module provides 16se/8di voltage input channels (Ch#1...#16), 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. Please see A/D datasheet (AD7685crmz) for details on this very accurate part.
Voltage input range on each channel is independently software programmable to one of: ±10mV, ±20mV, ±40mV, ±80mV, ±600mV, ±1.2V, ±2.5V, ±5V, ±10V20
, 0 to 1.2V, 0 to 2.5V, 0 to 5V
Internal A/D
24-bit
Internal 24-bit A/D Converter29 resolves voltage input range to ±8.4M digital value.
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 (±10mV...±10V20
)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
.
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. A/D converter resolves one sample in 4uSec.
Sensor Excitation
Included
Excitation power (+3.3V ±0.2V, <220mA, 28mA 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-430
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
).
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)
This module provides 2 channels (Ch#19...#20) that can output a voltage between -10.1 and +10.1V accurate to ±4mV. An internal 14-bit d/a converter is followed by an amplifier that can drive up to ±4 mA of current and drive up to 10K pF of capacitance. Each output is short-circuit protected against -18 to +18V, power on or off, without damage
Output Voltage Range
-10.1 to +10.1V
Each channel is set independently to a voltage between -10.1 and +10.1V via software running on a Windows computer
D/A Resolution
14-bit
Internal 14-bit digital-to-analog converter resolves 0...16383 digital value to -10.1 to +10.1V analog voltage with ~1.3mV per LSB (least-significant-bit) monotonic resolution
Output Absolute Accuracy
±4mV max error
Output is set accurate to ±4mV, which is the sum of all maximum error components (i.e. INL, DNL, linearity)
Output Voltage Noise
1.4mVrms typ
Approximately 1.4mVrms of random noise is present on the output signal at all times, independent of output voltage and load
Readback Accuracy
±3.2mV for ≥ ±5V ±1.2mV for < ±5V
A Scalar I/O subroutine writes to this channel to set the output voltage, and reads from this channel to have the A/D readback the output voltage. The readback voltage measurement accuracy is the same as that for the voltage measurement channels (e.g. ±3.2mV maximum error for output ≥ ±5V, ±1.2mV for output between 0V and ±5V).
Protected Voltage
-18 to +18V
Short any combination of voltage output channels to external -18 to +18V power source (i.e. capable of high current), instruNet power on or off, any duration, without damage
Fuse
Auto-Reset, 15 Milliamp
Internal fuse on each vout pin opens during > 15mA over-current condition, and automatically closes otherwise
Electrical Specifications, Precision Voltage Out, iNet-430
Output channel can drive up to ±4 mA of current, independent of output voltage
Output Capacitance Drive
10K pF
Output channel can drive capacitive load up to 10K pF, without oscillation or accuracy degradation
Output Coupling
DC
Output constant DC voltage or dynamic waveform with absolute voltage accuracy
Output Impedance
0.4 Ω typ
Output voltage accuracy degrades 0.4mV for each 1 mA of load
Calibration
Each Update
Output channel uses A/D converter at each update to calibrate the D/A (i.e. it outputs, reads with a/d, and then outputs again; in approx 700uSec per update)
Output Settling Time
700uSec max
Time required to settle to specified accuracy, after changing from minimum voltage to maximum voltage
Output Slew Rate
2V/uSec typ
Rate at which output voltage changes after update
Post-Reset State
±4mV max
Final output voltage after resetting or starting instruNet software
Power On/Off State
±30mV max
Final output voltage after powering instruNet hardware on or off
Update Glitch
±150mV for 30uSec typ
Pulse on output that occurs after updating this vout channel
Digital Feedthru Glitch
±200mV for 1uSec typ
Pulse on output that occurs after updating another vout channel
Reset Glitch
±200mV for 300mSec typ
Pulse on output that occurs after resetting or starting instruNet software
Power On/Off Glitch
±2V for 50mSec typ
Pulse on output that occurs after powering instruNet hardware on or off
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
Scalar I/O Benchmark
600 to 900uSec typ
Scalar I/O60
typically requires 600 to 900uSec to write 1 value to 1 output channel
Readback Scalar I/O
50 to 300uSec typ
Readback 1 voltage on 1 output pin with A/D in 50 to 300uSec
This module provides 2 channels (Ch#17...#18) that can output a voltage between 0 and +10.1V accurate to ±78mV. An internal 8-bit d/a converter is followed by an amplifier that can drive up to ±4 mA of current and drive up to 10K pF of capacitance. Each output is short-circuit protected against -18 to +18V, power on or off, without damage
Output Voltage Range
0 to +10.1V
Each channel is set independently to a voltage between 0 and +10.1V via software running on a Windows computer
D/A Resolution
8-bit
Internal 8-bit digital-to-analog converter resolves 0...255 digital value to 0 to +10.1V analog voltage with ~39.8mV per LSB (least-significant-bit) monotonic resolution
Output Absolute Accuracy
±78mV max error
Output is set accurate to ±78mV, which is the sum of all maximum error components (i.e. INL, DNL, linearity)
Output Voltage Noise
0.8mVrms typ
Approximately 0.8mVrms of random noise is present on the output signal at all times, independent of output voltage and load
Readback Accuracy
±3.2mV for ≥ ±5V ±1.2mV for < ±5V
A Scalar I/O subroutine writes to this channel to set the output voltage, and reads from this channel to have the A/D readback the output voltage. The readback voltage measurement accuracy is the same as that for the voltage measurement channels (e.g. ±3.2mV maximum error for output ≥ ±5V, ±1.2mV for output between 0V and ±5V).
Protected Voltage
-18 to +18V
Short any combination of voltage output channels to external -18 to +18V power source (i.e. capable of high current), instruNet power on or off, any duration, without damage
Fuse
Auto-Reset, 15 Milliamp
Internal fuse on each vout pin opens during > 15mA over-current condition, and automatically closes otherwise
Electrical Specifications, 8bit Voltage Out, iNet-430
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
Scalar I/O Benchmark
50 to 300uSec typ
Scalar I/O60
typically requires 50 to 300uSec to write 1 value to 1 output channel
Readback Scalar I/O
"
Readback 1 voltage on 1 output pin with A/D in 50 to 300uSec
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 write to d/a ic (Cs1), pulse low when rd/wr to Uio 25..28 port, pulse low when read from Uio 25..28 port, pulse low when read from a/d ic, pulse low when in software reset or power is off.
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. A/D converter resolves one sample in 4uSec.
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-430
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.
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
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
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
The iNet-430 module supports quantity 8 Voltage devices wired Differential or 16 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:
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:
The iNet-430 module supports quantity 8 Thermistor devices wired Differential or 16 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:
The iNet-430 module supports quantity 8 RTD devices wired Differential or 16 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:
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:
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:
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:
The iNet-430 module supports quantity 8 Current devices wired Differential or 16 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:
The iNet-430 module supports quantity 8 Resistance devices wired Differential or 16 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: