Front-panel calibration verification
The following topics describe verification procedures that are done with connections attached to the
terminals on the DMM6500 front panel.
DC voltage verification
The maximum input voltage between INPUT HI and INPUT LO is 1000 V DC and 750 V AC.
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 DC voltage accuracy for the 100 mV to 1000 V ranges
To verify 100 mV to 1000 VDC voltage accuracies, you will:
• Apply accurate DC voltages from the calibrator to the DMM6500 front-panel terminals.
• 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)).
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.
To verify DC voltage accuracy:
1. Use a low-thermal cable to connect the DMM6500 HI and LO INPUT terminals to the calibrator HI
and LO terminals as shown in the following figure.
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