Section 2: Performance verification
DMM6500 6½-Digit Multimeter with Scanning Calibration and Adjustment Manual
2-18
DMM6500-905-01 Rev. E June 2021
Verify the frequency
Use the following values to verify the performance of the DMM6500. Actual values depend on
published specifications (see
Example reading limit calculation
(on page 2-4)).
Description
Frequency (Hz) Lower limit (Hz) Upper limit (Hz)
10 Hz at 10 V
10
9.997
10.003
1 kHz at 5 V
1
0.9999
1.0001
10 kHz at 5 V
10
9.9991
10.0009
100 kHz at 5 V
100
99.991
100.009
300 kHz at 5 V
300
299.973
300.027
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 DMM6500.
•
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 DMM6500 can have non-trivial thermal offset
voltages, you must first correct for these to verify the DMM6500 specifications.
Summary of Contents for KEITHLEY DMM6500
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