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Chapter 5
Specifications
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog input
Parameter
A/D converters
Number of channels
Input isolation
Channel configuration
Differential input voltage range for the various sensor categories
Absolute maximum input voltage
Input impedance
Input leakage current
Normal mode rejection ratio
Common mode rejection ratio
Resolution
No missing codes
Input coupling
Warm-up time
Open thermocouple detect
CJC sensor accuracy
Table 1. Generic analog input specifications
Conditions
Thermocouple
RTD
Thermistor
Semiconductor sensor
±C0x through ±C7x relative to
GND (pins 9, 19, 28, 38)
Specification
Four dual 24-bit, Sigma-Delta type
8 differential
500 VDC minimum between field wiring and
USB interface
Software programmable to match sensor type
±0.080 V
0 to 0.5 V
0 to 2 V
0 to 2.5 V
±25 V power on, ±40 V power off.
5 Gigohm, min.
30 nA max.
Open thermocouple detect disabled
Open thermocouple detect enabled fIN = 60 Hz fIN = 50 Hz/60 Hz
105 nA max.
15 °C to 35 °C
0 °C to 70 °C
90 dB min.
100 dB min.
24 bits
24 bits
DC
30 minutes min.
Automatically enabled when the channel pair is configured for thermocouple sensor.
The maximum open detection time is 3 seconds.
±0.25 °C typ.,±0.5 °C max.
–1.0 to +0.5 °C max
20
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