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Section 2: Performance verification DMM6500 6½-Digit Multimeter with Scanning Calibration and Adjustment Manual
2-14 DMM6500-905-01 Rev. E June 2021
9. Set the calibrator to OPERATE .
10. Source ac voltages for each of the frequencies listed in the "Verify the ac voltage 750 V range"
table, below. Be sure that the readings are within low and high limits.
Verify the ac voltage 750 V range
Nominal value Frequency Lower limit Upper limit
740 50 Hz 739.33 740.67
740 1 kHz 739.33 740.67
740 50 kHz 738.66 741.34
740 100 kHz 734.96 745.04
Digitize dc voltage verification
To verify digitize dc voltage 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.
Use the values in the tables following the steps below to verify the performance of the DMM6500.
Actual values depend on the published specifications (see Example reading limit calculation (on page
2-4)).
The maximum input voltage between INPUT HI and INPUT LO is 1000 VDC and 750 VAC.
Exceeding this value may create a shock hazard.
The maximum common-mode voltage (the voltage between INPUT LO and chassis ground) is
500 V
PEAK
. Exceeding this value may cause a breakdown in insulation that can create a shock
hazard.
Verify the digitize voltage 100 mV to 1000 V ranges
Use shielded low-thermal connections when testing the 100 mV and 1 V ranges to avoid errors
caused by noise or thermal effects. Connect the shield to the output LO terminal of the calibrator.