Keithley DMM6500, Manual

Page: 27 / 123

DMM6500 6½-Digit Multimeter with Scanning Calibration and Adjustment Manual Section 2: Performance verification
DMM6500-905-01 Rev. E June 2021 2-17
Frequency verification
To verify frequency accuracy, you will:
•
Apply accurate frequencies from the function generator to the terminals on the front panel of the
DMM6500.
•
Verify that the displayed readings are within specified limits.
Use the values in the table 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)).
1. Connect the Keithley Instruments Model 3390 function generator to the DMM6500 INPUT HI and
LO terminals as shown in the following figure.
Figure 5: Connections for frequency verification and adjustment
2. On the DMM6500, press the FUNCTION key, select the Measure Functions tab, and select
Frequency .
3. Select the MENU key.
4. Under Measure, select Settings .
5. Set the Aperture to 250 ms .
6. Set the Threshold Range to 10 V .
7. Press the HOME key.
8. Source the voltage and frequency values as listed in Verify the frequency (on page 2-18). For
each setting, be sure that the reading is within low and high limits.