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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

 V and G pads open: >100 Meg Ohms min

 V and G pads shorted 100 k Ohms min

Absolute maximum input voltage

 Power on: ±35 V

 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

1 2 ... 18 19 20 21 22 23 24 25 26 27

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