OMB-DAQ-TC-RACK User's Guide
Specifications
20
Calibration method
Factory
Recommended warm-up time
20 minutes min
Calibration interval
1 year (factory calibration)
Note 1:
The enabled thermocouple inputs are continuously converted at the maximum A/D converter rate.
Note 2:
When thermocouple sensors are connected to different common mode voltages, the channels with floating
thermocouples sensors will be biased to approximately the average value of the applied common mode voltages.
Each of the applied common mode voltages must then be less than or equal to the average common mode
voltage ±1.40 V or [CMV
applied
≤ (CMV
average
±1.4 V)].
Note 3:
Measurement sensitivity is the smallest change in temperature that can be detected.
Channel configuration
Table 2. Channel configuration specification
Sensor Category
Condition
Specification
Thermocouple
J, K, S, R, B, E, T, N
32 differential channels
Note 4:
Channel configuration is stored on EEPROM external to the isolated microcontroller by the firmware whenever
any item is modified. Modification is performed by commands issued from an external application, and the
configuration is made non-volatile through the use of the EEPROM.
Compatible thermocouple sensors
Table 3. Compatible sensor type specifications
Parameter
Specification
Thermocouple
J: –210 °C to 1200 °C
K: –270 °C to 1372 °C
R: –50 °C to 1768 °C
S: –50 °C to 1768 °C
T: –270 °C to 400 °C
N: –270 °C to 1300 °C
E: –270 °C to 1000 °C
B: 0 °C to 1820 °C
