Owner's manual

20
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
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)
±25 V 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
fIN = 60 Hz
90 dB min.
Common mode rejection ratio
fIN = 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