Measurement Specialties USB-5201 - Manual (Page 23)

USB-5201 User's Guide Specifications
23
Accuracy
Thermocouple measurement accuracy
Table 3. Thermocouple accuracy specifications, including CJC measurement error
Sensor Type Maximum error Typical error Temperature range
J ±1.499 °C ±0.507 °C -210 to 0 °C
±0.643 °C ±0.312 °C 0 to 1200 °C
K ±1.761 °C ±0.538 °C -210 to 0 °C
±0.691 °C ±0.345 °C 0 to 1372 °C
S ±2.491 °C ±0.648 °C -50 to 250 °C
±1.841 °C ±0.399 °C 250 to 1768.1 °C
R ±2.653 °C ±0.650 °C -50 to 250 °C
±1.070 °C ±0.358 °C 250 to 1768.1 °C
B ±1.779 °C ±0.581 °C 250 to 700 °C
±0.912 °C ±0.369 °C 700 to 1820 °C
E ±1.471 °C ±0.462 °C -200 to 0 °C
±0.639 °C ±0.245 °C 0 to 1000 °C
T ±1.717 °C ±0.514 °C -200 to 0 °C
±0.713 °C ±0.256 °C 0 to 600 °C
N ±1.969 °C ±0.502 °C -200 to 0 °C
±0.769 °C ±0.272 °C 0 to 1300 °C
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
(pins 9, 19, 28, 38). The device 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 ±1.4 V. For best results we recommend the use of
ungrounded or insulated thermocouples when possible.
Throughput rate to PC
Table 4. Throughput rate specifications
Number of input channels Maximum throughput
1 2 Samples/second
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