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Chapter 6
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
power supply input.
Channel configuration
Software programmable to match sensor type
Differential input voltage range
for the various sensor categories
Thermocouple
±0.080 V
RTD
(OM-WEB-TEMP only)
0 to 0.5V
Thermistor
(OM-WEB-TEMP only)
0 to 2 V
Semiconductor sensor
(OM-WEB-TEMP only)
0 to 2.5 V
Absolute maximum input voltage
±C0x through ±C7x relative to
AGND (pins 9, 19, 28, 38)
±25 V (power on)
±40 V (power off)
Input impedance
5 GΩ (power on)
1 MΩ (power off)
Input leakage current
Open thermocouple detect
disabled
30 nA max
Open thermocouple detect
enabled
105 nA max
Common mode rejection ratio
f
IN
= 60 Hz
100 dB min
ADC Resolution
24 bits
ADC 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 a thermocouple sensor.
The maximum open detection time is 3 seconds.
CJC sensor accuracy
15 °C to 35 °C
–0.75 °C to 0.5 °C max
0 °C to 55 °C
–1.5 °C to 1.25 °C max