Measurement Computing CIO-EXP32 - Manual (Page 23)

Chapter 5
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog input
Table 1. Analog input specifications
Parameter Specification
Number of channels 32 differential (2 banks of 16)
Input range ±10 V
Gain Switch selectable by bank, additive values of X1, X10, X100, X200 and X500
Calibration Two offset potentiometers per bank (16 channels) and one Cold Junction
Compensation adjustment potentiometer per board.
Gain error Gain = 1 0.002% typical, 0.02% max
Gain = 10 0.005% typical, 0.05% max
Gain = 100 0.01% typical, 0.1% max
Gain = 200 0.02% typical, 0.2% max
Gain = 500 0.05% typical, 0.5% max
Non-linearity Gain = 1 0.0005% typical, 0.005%
Gain = 10 0.001% typical, 0.01% max
Gain = 100 0.002% typical, 0.01% max
Gain = 200 0.003% typical, 0.01% max
Gain = 500 0.005% typical, 0.02% max
Temperature coefficient Gain = 1 ± 20 ppm / °C
Gain = 10 ± 20 ppm / °C
Gain = 100 ± 40 ppm / °C
Gain = 200 ± 60 ppm / °C
Gain = 500 ± 100 ppm / °C
Offset ± 15
µV / °C
Common mode range ±10 V
CMRR @ 60 Hz 90 dB
Input filter 7 Hz, selectable through solder bridge (C pad)
Open thermocouple detect -50 mV at positive input when thermocouple is open, selectable through solder
bridge (V pad)
Input ground reference 100k ohms to ground, selectable through solder bridge (G pad)
Input leakage current V and G pads open: 2 nA typical, 6 nA max
Input impedance
ƒ V and G pads open: >100 Meg Ohms min
ƒ V and G pads shorted 100 k Ohms min
Absolute maximum input voltage
ƒ Power on: ±35 V
ƒ Power off: ±20 V
Cold junction compensation
Table 2. Cold junction compensation specifications
Parameter Specification
CJC output voltage 24 mV / °C
CJC zero crossing 0 mV at 0 °C
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