Accuracy, Thermocouple measurement accuracy, Throughput rate – Measurement Computing USB-TC User Manual
Page 16
USB-TC User's Guide
Specifications
16
Accuracy
Thermocouple measurement accuracy
Table 3. Thermocouple accuracy specifications, including CJC measurement error
Sensor Type
Maximum error (°C)
Typical error (°C)
Temperature range (°C)
J
±1.499
±0.507
–210 to 0
±0.643
±0.312
0 to 1200
K
±1.761
±0.538
–210 to 0
±0.691
±0.345
0 to 1372
S
±2.491
±0.648
–50 to 250
±1.841
±0.399
250 to 1768.1
R
±2.653
±0.650
–50 to 250
±1.070
±0.358
250 to 1768.1
B
±1.779
±0.581
250 to 700
±0.912
±0.369
700 to 1820
E
±1.471
±0.462
–200 to 0
±0.639
±0.245
0 to 1000
T
±1.717
±0.514
–200 to 0
±0.713
±0.256
0 to 600
N
±1.969
±0.502
–200 to 0
±0.769
±0.272
0 to 1300
Note 3:
Thermocouple specifications include linearization, cold-junction compensation and system noise.
These specs are for one year, or 3000 operating hours, whichever comes first and for operation of the
device between 15 °C and 35 °C. For measurements outside this range, add ±0.5 degree to the
maximum error shown. There are CJC sensors on each side of the module. The accuracy listed above
assumes the screw terminals are at the same temperature as the CJC sensor. Errors shown do not
include inherent thermocouple error. Please contact your thermocouple supplier for details on the
actual thermocouple error.
Note 4:
Thermocouples must be connected to the device such that they are floating with respect to GND.
The GND pins are isolated from earth ground, so connecting thermocouple sensors to voltages
referenced to earth ground is permissible as long as the isolation between the GND pins and earth
ground is maintained.
Note 5:
When thermocouples are attached to conductive surfaces, the voltage differential between multiple
thermocouples must remain within ±1.4V. For best results we recommend the use of ungrounded or
insulated thermocouples when possible.
Throughput rate
Table 4. Throughput rate specifications
Number of input channels
Maximum throughput
1
2 S/s
2
2 S/s on each channel, 4 S/s total
3
2 S/s on each channel, 6 S/s total
4
2 S/s on each channel, 8 S/s total
5
2 S/s on each channel, 10 S/s total
6
2 S/s on each channel, 12 S/s total
7
2 S/s on each channel, 14 S/s total
8
2 S/s on each channel, 16 S/s total