Keithley DMM6500

Model DMM6500 6½-Digit Multimeter with Scanning Calibration and Adjustment Manual Section 2: Performance verification
DMM6500-905-01 Rev. A/July 2018 2-27
DC current 100 mA to 3 A range verification
To verify DC current accuracy on the 100 mA to 3 A ranges, you will:
• Apply accurate current from the DC current calibrator directly to the DMM6500 front-panel
terminals.
• Verify that the displayed readings are within specified limits.
To verify DC current accuracy:
1. Set up the DMM6500 for DC current and the range being tested. Make sure that relative offset is
disabled.
2. Connect the DMM6500 and calibrator as shown in the following figure.
Figure 13: Connections for 100 mA to 3 A range verification
Zero verify the DMM6500:
1. On the calibrator, select the OPR/STBY key. Make sure that the front panel displays STANDBY.
2. Set the ranges to 100 mA.
3. Verify the DMM6500 zero reading for each range.
Apply a relative offset:
1. On the calibrator, select the OPR/STBY key. Make sure that the front panel displays OPERATE.
2. Set the calibrator to source zero current and apply the relative offset to the DMM6500.
3. Source DC current from the following table. For each setting, be sure that the reading is within
stated limits.
4. Repeat these steps for the 1 A and 3 A ranges.
Verify DC current 100 mA range
Description
Calibrator
setpoint (A)
Lower limit
Upper limit
UUT zero
STANDBY
REL
n/a
Full scale (+)
0.1
9.9975E-02
1.000250E-01
Half scale (+)
0.05
4.9985E-02
5.0015E-02
Half scale (–)
–0.05
–5.0015E-02
–4.9985E-02
Full scale (–)
–0.1
–1.000250E-01
–9.99750E-02