Fluke 52, 51, 54, 53 service manual Menu on the display changes to CAL A-d

51, 52, 53, 54 Series II

Service Manual

Calibration button access

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Figure 4. Calibration Button Access

3. The menu on the display changes to “ CAL A-d”.

Note

Within CAL are four menu options that may be accessed by pressing E:

∙CAL A-dprompts the operator for the A/D calibration inputs in mV dc.

∙CAL rEF allows the operator to calibrate the reference junction at a known temperature.

∙CAL donE saves the new calibration constants in memory.

∙CAL Abrt ignores calibration changes (turning the thermometer off while in CAL will also ignore calibration changes).

4.Press K or N to select different menu options.

5.With CAL A-dselected, press E. The thermometer prompts “80”. Set the calibrator to +80.000 mV and allow the output to stabilize.

Note

For steps 6 and 8, keep hand and body motion to a minimum while the thermometer takes A/D readings.

6.Press E. Wait while it takes A/D readings.

7.When the thermometer prompts for “-8”, set the Calibrator to -8.0000 mV. Allow the output to stabilize.

8.Press E on the thermometer and wait while it takes A/D readings. The thermometer now shows the measured value in the bottom portion of the display. Millivolts appears on the left side and microvolts appears on the right side.

9. If the measurement is from –7 995.0 to –8 005.0, press E and the meter will return to the calibration menu and display CAL rEF. If the measurement is outside – 7995.0 to –8005.0, press E once to return to the calibration menu. Using

K or N, select CAL A-dand try the A/D calibration procedure a second time starting at step 5.

10.Using K or N, select “ CAL donE”, then press E to store the calibration in memory.

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