1652C/1653B/1654B
Calibration Manual
18
Performance Tests
The performance tests that follow will ensure that the Tester, or Unit Under Test (UUT),
is in proper operating condition and will check the accuracy of each Tester function
against its specifications. To perform the tests you will need a Fluke 5320A/VLC
Calibrator or equipment meeting the minimum specification given in Table 2. Before you
begin the accuracy tests, allow the Tester to stabilize to room temperature. Depending on
temperature gradient, this could take up to several hours.
If the Tester fails any of these tests, it needs calibration adjustment or repair.
Backlight Test
To test that the backlight circuit works, do the steps that follow:
1. Turn the Tester on using .
2. To turn on the backlight, press once.
3. Press the button a second time to turn it off.
LCD Test
To test all LCD segments and the display’s contrast quality:
1. To turn the UUT off, press .
2. While holding down <, power the Tester back on.
3. Continue to hold < down after releasing .
4. Compare the display segments to Figure 2 for the 1652C and 1653B. Compare the
display segments to Figure 3 for the 1654B. Check for any missing segments or poor
contrast areas.
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Figure 2. 1652C and 1653B LCD Tests
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