Accuracy; Thermocouple Measurement Accuracy; Throughput Rate - Measurement Computing Measurement Advantage USB-TC User Manual

USB-TC User's Guide

Accuracy

Thermocouple measurement accuracy

Table 5-3. Thermocouple accuracy specifications, including CJC measurement error
Sensor Type
J
K
S
R
B
E
T
N
Thermocouple specifications include linearization, cold-junction compensation and system
Note 3:
noise. These specs are for one year, or 3000 operating hours, whichever comes first and for
operation of the USB-TC 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.
Thermocouples must be connected to the USB-TC such that they are floating with respect to
Note 4:
GND (pins 9, 19, 28, 38). The USB-TC 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.
When thermocouples are attached to conductive surfaces, the voltage differential between
Note 5:
multiple thermocouples must remain within ±1.4V. For best results we recommend the use
of ungrounded or insulated thermocouples when possible.

Throughput rate

Number of input channels
1
2
3
4
5
6
7
8
The analog inputs are configured to run continuously. Each channel is sampled twice per
Note 6:
second. The maximum latency between when a sample is acquired and the temperature data
is provided by the USB unit is approximately 0.5 seconds.
Maximum error Typical error
±0.575 °C ±0.279 °C
±0.629 °C ±0.309 °C
±1.159 °C ±0.991 °C
±0.806 °C ±0.634 °C
±1.142 °C ±0.974 °C
±0.767 °C ±0.619 °C
±1.520 °C ±1.242 °C
±0.912 °C ±0.698 °C
±0.553 °C ±0.263 °C
±0.641 °C ±0.347 °C
±0.529 °C ±0.281 °C
±0.738 °C ±0.420 °C
±0.596 °C ±0.318 °C
Table 5-4. Throughput rate specifications
Maximum throughput
2 Samples/second
2 S/s on each channel, 4 S/s total
2 S/s on each channel, 6 S/s total
2 S/s on each channel, 8 S/s total
2 S/s on each channel, 10 S/s total
2 S/s on each channel, 12 S/s total
2 S/s on each channel, 14 S/s total
2 S/s on each channel, 16 S/s total
Temperature range
-210 to 1200 °C
-200 to 1372 °C
-50 to 1768.1 °C
250 to 1768.1 °C
-50 to 1768.1 °C
250 to 1768.1 °C
250 to 1820 °C
700 to 1820 °C
-200 to 1000 °C
-200 to 600 °C
0 to 600 °C
-200 to 1300 °C
0 to 1300 °C
5-2
Specifications