5-1
Chapter 5
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in
italic text
are guaranteed by design.
Analog input section
Table 5-1. Generic analog input specifications
Parameter Conditions
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
Thermocouple ±0.080
V
RTD
0 to 0.5 V
Thermistor
0 to 2 V
Differential input voltage
range for the various sensor
categories
Semiconductor sensor
0 to 2.5 V
Absolute maximum input
voltage
±C0x through ±C7x relative to GND
(pins 9,19,28,38)
±25V power on, ±40 V power off.
Input impedance
5 Gigohm, min.
Open thermocouple detect disabled
30 nA max.
Input leakage current
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.
15 °C to 35 °C
±0.25 °C typ.,±0.5 °C max.
CJC sensor accuracy
0 °C to 70 °C
-1.0 to +0.5 °C max
