instruNet i60x Datasheet Miniature USB Data Acquisition System Attaches Directly to Sensors
i600/i601 FeaturesFeatures
The i600/i601 USB Data Acquisition device connects a Windows computer to sensors and controls via analog inputs, digital inputs and digital outputs.
The i601 product provides ±36V bank electrical isolation; whereas the less costly i600 connects I/O signal ground to computer ground. i60x receives power from USB bus.
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)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: ±20mV, ±40mV, ±80mV, ±150mV, ±300mV, ±600mV, ±1.2V, ±2.5V, ±5V, ±10V
Included is a mating Hd44 Female Connector & Cover. Alternatively, one can attach i600/i601 to the following optional wiring boxes: i510, i511, i512. If one is working with thermocouples, an i510 wiring box is required due to it’s internal cold junction compensation.
i600 and i601 are stand-alone USB data acquisition systems. No additional components, such as external power supply, are required. Included in the box: i60x Hardware Device, USB Cable, Software on CD, Mating Hd44 Female Connector & Hd44 Cover. For details, see the i60x Installation Guide.
Digitize at a maximum sample rate of 160K sample/sec for 1 channel, 12Ks/sec/ch for 2 channels, 6Ks/sec/ch for 4 channels, and 3Ks/sec/ch for 8 channels. For more details, see Voltage Accuracy.
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, <80mA, 28mA per sensor max) is provided for sensors30, 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 4mA sink/source digital I/O port consists of 4 individual TTL-compatible lines (Ch#25...#28), each of which can be configured as: input or output bit45
. When configured as an input, a channel can be used to sense a digital high (2 to 5.5 Volts) or digital low (0V to 0.8Volts). 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 6.0V and down to -6.0V.
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
Voltage input range on each channel is independently software programmable to one of: ±20mV, ±40mV, ±80mV, ±150mV, ±300mV, ±600mV, ±1.2V, ±2.5V, ±5V, ±10V
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 (±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
-30 to +30V
Short any combination of voltage input channels to external -30 to +30V 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
13 KHz RFI filter on ≤ ±150mVrange
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 160K sample/sec for 1 channel on largest voltage input range. More channels at same voltage input range involves slower rates, e.g. 12Ks/sec per channel for 2 channels, 6Ks/sec/ch for 4 channels, and 3Ks/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). 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, <80mA, 28mA per sensor max) is provided for sensors30, 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-600 & iNet-601
All voltage input pins must be driven with a voltage between -10 and +10V, with respect to instruNet ground. i600 ground is connected to computer ground via USB bus (which is connected to Earth ground via computer power supply plug 3rd prong). Alternatively, i601 ground is electrically isolated from computer ground.
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
35 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
4.5 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 4.5 nA at 37°C, and 2.3 nA at 25°C.
Input Circuit
Multiplexer
Voltage input pin connects directly to internal protected multiplexer IC
Common Mode Rejection Ratio
≥ 110dB
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)
Signals are available at Hd44 connector pins: #1...#16217
Ground Reference
Hd44 Pins 29/42/43/44
i600 ground is connected to computer ground via USB bus (which is connected to Earth ground via computer power supply plug 3rd prong). Alternatively, i601 ground is electrically isolated from computer ground.
4x Digital I/O, 4mA sink/source, iNet-600 & iNet-601
The 4mA sink/source digital I/O port consists of 4 individual TTL-compatible lines (Ch#25...#28), each of which can be configured as: input or output bit. When configured as an input, a channel can be used to sense a digital high (2 to 5.5 Volts) or digital low (0V to 0.8Volts). 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 6.0V and down to -6.0V.
Function
input or output bit
Each bit is independently software programmed as an input or output
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
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, Digital I/O, iNet-600 & iNet-601
Functions properly when working with 0 to +5.5V between the I/O pin and instruNet gnd, where each bit is set up as an input or output
Protected Voltage
-6 to +6V
Short any combination of I/O pins to external -6 to +6V 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, 4 Milliamp
Internal fuse on each I/O pin opens during > 4mA over-current condition, and automatically closes otherwise
"0" Input Voltage
0 to +0.8V
Applying 0 to +0.8V is read as logic 0 when I/O pin is configured as input
"0" Input Current
Amps = Vin / 50K
External signal must pull up internal 50.0K resistor (which is connected to GND).
"1" Input Voltage
2V to +5.5V
Applying 2V to 5.5V is read as logic 1 when I/O pin is configured as input. If left unconnected this pin floats to 0V.
"0" Output Voltage
< 0.7V @ 2mA, < 0.9V @ 4mA
I/O pin configured as an output sinks current low to 0.3V...0.7V with 0 to 2mA load; or sinks low to 0.3V...0.9V with 0 to 4mA load
"1" Output Voltage
> 2.4V @ 2mA, > 2.2V @ 4mA
I/O pin configured as an output sources current high to 2V...3.3V with 0 to 4mA load.
Software Interface, Digital I/O, iNet-600 & iNet-601
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 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: digital I/O bits, 0 or 1 value, scalar input/output, no high speed i/o, 4mA sink/source
Bank Software Channels
Uio25_28 In Uio25_28 Out
Channel #29: bank of 4 bits, 0...15 value, scalar input/output, no high speed i/o Channel #30: bank of 4 bits, 0...15 value, scalar input/output, no high speed i/o
Signals are available at Hd44 connector pins: #25...#28217
Ground Reference
Hd44 Pins 29/42/43/44
i600 ground is connected to computer ground via USB bus (which is connected to Earth ground via computer power supply plug 3rd prong). Alternatively, i601 ground is electrically isolated from computer ground.
digital I/O bits, 0 or 1 value, scalar input/output, no high speed i/o, 4mA sink/source, 0 to 3.3V
#26
Ch26 Dio
"
"
#27
Ch27 Dio
"
"
#28
Ch28 Dio
"
"
#29
Gnd
instruNet Ground
i600 ground is connected to computer ground via USB bus (which is connected to Earth ground via computer power supply plug 3rd prong). Alternatively, i601 ground is electrically isolated from computer ground.
#30
Internal_30
Internal Use Only
Pin is used by manufacturer for product testing, please do not touch
i600 ground is connected to computer ground via USB bus (which is connected to Earth ground via computer power supply plug 3rd prong). Alternatively, i601 ground is electrically isolated from computer ground.
+3.3Vdc power available to end user at Hd44 connector pins 34 and 35
+5V End User Pwr
+5V ±0.6V, <8mA
+5Vdc power available to end user at Hd44 connector pins 36 and 37
+15V End User Pwr
+15V ±1.2V, <4mA
+15Vdc power available to end user at Hd44 connector pins 38 and 39
-15V End User Pwr
-15V ±1.2V, <4mA
-15Vdc power available to end user at Hd44 connector pins 40 and 41
Fuse
Auto-Reset
Internal fuse on each power voltage opens during over-current condition, and automatically closes otherwise. 3.3Vref has 0.25A fuse, 5Vpwr has 15mA/100Ω fuse, and ±15Vpwr has 7mA/470ohmΩ fuse.
Voltage Specification Conditions, iNet-600 & iNet-601
The iNet-600 & iNet-601 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, 4.5nA 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-600 & iNet-601 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, 4.5nA 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-600 & iNet-601 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, 4.5nA 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, 4.5nA 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.
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, 4.5nA 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.
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, 4.5nA 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:
Current Specification Conditions, iNet-600 & iNet-601
The iNet-600 & iNet-601 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, 4.5nA 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-600 & iNet-601 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, 4.5nA 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
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Software Programmable Parameters
Each channel provides the following independently programmable parameters: