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23
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
Table 1. Generic analog input specifications
Parameter
Condition
Specification
A/D converters
Four dual 24-bit, Sigma-Delta type
Number of channels
8 differential
Input isolation
500 VDC minimum between field wiring and
USB interface
Channel configuration
Software programmable to match sensor type
Differential input voltage
range
Thermocouple
±0.080 V
RTD
0 to 0.5 V
Thermistor
0 to 2 V
Semiconductor sensor
0 to 2.5 V
Absolute maximum input
voltage
±C0x through ±C7x relative to GND
±25 V power on
±40 V power off
Input impedance
5 GΩ, min
Input leakage current
Open thermocouple detect disabled
30 nA max
Open thermocouple detect enabled
105 nA max
Normal mode rejection ratio
f
IN
=60 Hz
90 dB min
Common mode rejection
ratio
f
IN
=50 Hz/60 Hz
100 dB min
Resolution
24 bits
No missing codes
24 bits
Input coupling
DC
Warm-up time
30 minutes min
Open thermocouple detect
Automatically enabled when the channel pair is
configured for thermocouple sensor.
The maximum open detection time is 3 seconds.
CJC sensor accuracy
15 °C to 35 °C
±0.25 °C typ,±0.5 °C max
0 °C to 70 °C
–1.0 °C to +0.5 °C max
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