Datasheet

Measurement Computing [phone]
4
[e-mail] mccdaq.com
MCC 134
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
Thermocouple input
A/D converters: Delta-Sigma
ADC resolution: 24 bits
Number of channels: 4
Input isolation
Between input and Raspberry Pi ground: 500 Vpk withstand max
Differential input voltage range: ±78.125 mV
Common mode voltage range
Between any CHx+ or – input and any other input: 0.8 V max
Absolute maximum input voltage
Between any two TCx inputs: ±25 V (power on), ±25 V (power off)
Differential input impedance: 40 MΩ
Input current: 83 nA
Common mode rejection (f
IN
= 50 Hz or 60 Hz): 100 dB
Update interval: 1 second min
Open thermocouple detect response time: 2 seconds
Recommended Warm-up time: 15 minutes min
Calibration method: Factory
Compatible thermocouples
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: 50 °C to 1820 °C
Accuracy
Thermocouple measurement accuracy
Thermocouple accuracy specifications, including typical CJC measurement error.
All specifications are (±).
Note 1: Thermocouple measurement accuracy specifications include polynomial
linearization, cold-junction compensation error, and system noise. Accura-
cies shown do not include inherent thermocouple error or large temperature
gradients across the board. Contact your thermocouple supplier for details on
the inherent thermocouple accuracy error. The accuracy specifications assume
the device has been warmed up for the recommended 15 minutes.
Note 2: To avoid excessive cold-junction compensation errors, operate the device
in a stable temperature environment and away from heat sources that could
cause temperature gradients across the board. Refer to the documentation for
ways to decrease this error.
Note 3: When thermocouples are attached to conductive surfaces, the voltage
differential between multiple thermocouples must remain within ±0.8 V. For
best results MCC recommends using electrically insulated thermocouples when
possible.
Specifications