Specifications; Analog Input Section - Measurement Computing USB-TEMP User Manual

Specifications

Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.

Analog input section

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 5-1. Generic analog input specifications
Conditions
Thermocouple
RTD
Thermistor
Semiconductor sensor
±C0x through ±C7x relative to GND
(pins 9,19,28,38)
Open thermocouple detect disabled
Open thermocouple detect enabled
f 60 Hz
=
IN
f 50 Hz/60 Hz
IN=
15 °C to 35 °C
0 °C to 70 °C
5-1
Chapter 5
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
±25V power on, ±40 V power off.
5 Gigohm, min.
30 nA max.
105 nA max.
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