Performance Tests; Warming-Up The Tester; Checking The Display Pixels; Testing Voltage Performance - Fluke 39 Service Manual

39/41B
Service Manual

4-3. Performance Tests

If the Tester passes the following tests, the meter is in proper operating condition. If the
meter fails any of the performance tests, calibration adjustment and/or repair is needed.
4-4.

Warming-Up the Tester

Before performing any of the following performance tests, the Tester should be allowed
to sit for four hours in an environment of 18-28° C with a relative humidity of less than
70%. Once adjusted to the environment, turn on the Tester and allow it to warmup for at
least 2 minutes.
4-5.

Checking the Display Pixels

To check the Tester's diplay pixels, press and hold o. The Tester displays a uniform
checkerboard pixel pattern. Visually check the pixel pattern for missing pixels. When
done, release o and the Tester will start normal operation. If the display is not at a
viewable level, change the contrast setting to a normal level and repeat.
The following procedures are based on using two calibrators, a phase
meter and a dual channel signal generator. Other test equipment
configurations may require some adjustments in the performance tests and
calibration procedures described in this chapter.
4-6.

Testing Voltage Performance

Perform the following procedure to test the voltage function of the Tester.
Ensure that the calibrator is in standby mode before making
any connection between the calibrator and Tester. dangerous
voltages may be preSent on the leads and connectors.
1. Connect a cable from the Output Voltage HI and LO connectors of calibrator "A" to
2. Press M until the text screen is displayed.
3. Press F until V is diplayed in the upper right corner of the display.
4. Press f until VP is displayed in the top status line of the Tester.
5. Set the output of calibrator "A" to the Calibrator Output values in Table 4-2. DC
Apply the voltage incrementally so the Tester does not autorange to the
next higher range. Ensure the Tester is in the appropriate range before
checking the reading against the performance limits.
6. Verify that the readings are within the minimum and maximum limits specified in
4-4
the V and COM connectors on the Tester.
voltages are listed in the upper section of the table and AC voltages at 50 or 60 Hz,
whichever is your local line frequency, are listed in the lower section of the table.
Blank fields do not need to be evaluated.
Table 4-2.
Note
Warning
Note