Simulated Thermocouple Type J Temperature Verification - Keithley DMM7510 Calibration Manual

Section 2: Performance verification
Verify the frequency
Use the following values to verify the performance of the Model DMM7510. Actual values depend on
published specifications (see
Description
10 Hz at 5 V
1 kHz at 5 V
10 kHz at 5 V
100 kHz at 5 V
250 kHz at 5 V
500 kHz at 5 V

Simulated thermocouple type J temperature verification

To verify thermocouple accuracy, you will:
•
Apply accurate voltages from the calibrator to the terminals on the front panel of the Model
DMM7510.
•
Verify that the displayed readings are within specified limits.
Thermocouple accuracy is verified by using a DC voltage calibrator to output values from standard
thermocouple tables available from the National Institute of Standards and Technology (NIST) or
other sources.
In the table following the steps below, three representative values are listed from a Type J
thermocouple table for temperatures –190 °C, 0 °C, and 750 °C, with their respective thermocouple
voltages listed in the "Uncompensated calibrator source value" column. The calibrator source values
are based on NIST Monograph 175, reference data 60, version 2.0.
Verify thermocouple accuracy
Because the cable connecting the calibrator to the Model DMM7510 can have non-trivial thermal
offset voltages, you must first correct for these to verify the Model DMM7510 specifications.
To verify the simulated thermocouple Type J temperature:
1. Connect the Model DMM7510 HI and LO INPUT terminals to the calibrator HI and LO terminals
as shown in the following figure.
2-20
Example reading limit calculation
Frequency (Hz) Lower limit (Hz)
1.00E+01 9.999197E+00
1.00E+03 9.999197E+02
1.00E+04 9.999197E+03
1.00E+05 9.999197E+04
2.50E+05 2.499799E+05
5.00E+05 4.999598E+05
Model DMM7510 Calibration and Adjustment Manual
(on page 2-7)).
Upper limit (Hz)
1.000080E+01
1.000080E+03
1.000080E+04
1.000080E+05
2.500201E+05
5.000402E+05
DMM7510-905-01 Rev. B / February 2016