Chapter 4 Specifications; Thermocouple Input - Measurement Computing TC-32 User Manual

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Specifications
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.

Thermocouple input

Parameter
A/D converter type
A/D resolution
Number of channels
Filtering options
Isolation
Channel configuration
Differential input voltage range
Absolute maximum input
voltage
Differential input impedance
Input current
Common mode rejection
Noise rejection
Input bandwidth
Crosstalk
Sample rate (Note 1)
Common mode voltage range
(Note 2)
Input noise
Gain error
Offset error
Measurement sensitivity
(Note 3)
Warm-up time
Open thermocouple detect
response time
CJC sensor accuracy
The enabled thermocouple inputs are continuously converted at the maximum A/D converter rate.
Note 1:
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Table 1. Generic analog input specifications
Condition
Between any TCx channel and chassis
ground.
Between any two TCx inputs
50 Hz filtering, power on
60 Hz filtering, power on
Open thermocouple detect disabled
Open thermocouple detect enabled
50 Hz filtering, at DC and f =50 Hz
in
60 Hz filtering at DC and f =60 Hz
in
50 Hz filtering at f =50 Hz
in
60 Hz filtering at f =60 Hz
in
50 Hz filtering
60 Hz filtering
Between any two TCx inputs
TCx channel to TCx channel
TCx channel relative to chassis
ground, f = 60 Hz
in
TCx channel relative to chassis ground
50 Hz or 60 Hz filtering
50 Hz or 60 Hz filtering
50 Hz or 60 Hz filtering
Thermocouple type J,K,T,E,N
Thermocouple type R,S
Thermocouple type B
0 °C to 45 °C
18
(603) 746-5524
Specification
Delta-Sigma
24-bit
32
50 Hz or 60 Hz noise filtering, software-
selectable
500 VDC absolute max
Software-selectable to match thermocouple
sensor type
±78.125 mV
±25 V (power on)
±25 V (power off)
26 MΩ
20 MΩ
2 nA
75 nA
110 dB
110 dB
80 dB typ.
80 dB typ.
22 Hz
26 Hz
-90 dB
3 Hz max (per channel)
±1.40 V
±3.5 VAC p-p
±48 V DC
510 nV rms
0.004 % FSR
3 µV
0.07 °C
0.18 °C
0.60 °C
20 minutes min
1 second
±0.20 °C typ
±0.40 °C max
Chapter 4