Tektronix KEITHLEY DMM6500, Calibration Manual

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Section 2: Performance verification DMM6500 6½-Digit Multimeter with Scanning Calibration and Adjustment Manual
2-10 DMM6500-905-01 Rev. E June 2021
AC voltage verification
To verify ac voltage accuracy:
•
For the 100 mV to 100 V ranges, apply accurate voltages from the calibrator to the DMM6500
front-panel terminals.
•
For the 750 V range, connect the Fluke 5725A Amplifier to the calibrator. Apply accurate voltages
from the calibrator terminals 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 750 V dc. 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 ac voltage accuracy for the 100 mV to 100 V ranges
Use shielded, low-capacitance cabling. For the 100 mV to 100 V ranges, avoid loading that exceeds
1000 pF.
Excessive capacitance may result in additional load regulation uncertainties and could cause the
calibrator output to open (go into standby).