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Tensioning Guide
Belt-diagram
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Work Order Templates

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Daily Electrical System Inspection
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Fluke Multimeter 77

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Maintenance Plans for Fluke Multimeter Model 77

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Multimeter Check

Display Test (70/73 Series III below s/n 80810247 only)

To test the display, turn the UUT on and check whether all display segments come on.

Display Test (21/23/75/77 Series III only)

To test the display, press the range and hold buttons while turning the UUT on and check whether all display segments come on.

DC Voltage Test

Connect the ground/common/low side of the DC calibrator to COM on the UUT.

1. Set the UUT function switch to VDC, and connect the DC Voltage Calibrator output to the v and COM input terminals of the UUT.

2. Referring to Table 3, set the DC Voltage Calibrator for the output indicated in steps 1 through 5 only. Verify that the UUT display reading is within the limits shown.

3. Set the DC Voltage Calibrator for an output of +300 mV, and switch the UUT to the 300 mV function.

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Multimeter Calibration

Calibration

Set the DC Voltage Calibrator to zero, and set the UUT to the VDC function.

Remove the case top cover as previously described.

Connect the DC Voltage Calibrator to the and COM input terminals of the UUT.

Set the DC Voltage Calibrator for an output of +3.000V dc, and adjust R8 for a display reading of +3.000V dc ±.001V.

Sign off on the multimeter calibration

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Multimeter Cleaning

Warning: Do not use aromatic hydrocarbons or chlorinated solvents for cleaning.

Do not allow the LCD to get wet. Remove the display assembly before washing the pca.

Do not use detergent of any kind for cleaning the pca.

Do not remove lubricants from the switch when cleaning the pca.

Clean the instrument case with a mild detergent and water.

The pca may be washed with isopropyl alcohol or deionized water and a soft brush.

Remove the display assembly and fuses before washing, and avoid washing the switch if possible.

Dry the pca with clean dry air at low pressure, then bake it at 50°C for 24 hours.

Sign off on the multimeter cleaning

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1 Yearly Multimeter Check

Performance Tests

The performance tests are recommended as a preventive maintenance tool to verify proper instrument operation. A one year calibration cycle is recommended to maintain the specifications given. If the recommended equipment is not available, instruments with equivalent specifications may be used.

Instrument Type

Recommended Model

Performance tests are recommended for incoming inspection, periodic maintenance, and for verifying the specifications. If the instrument fails any part of the test, calibration and/or repair is indicated.

In the performance tests, the Series III Meters are referred to as the unit under test (UUT).

Initial Procedure

Allow the UUT to stabilize to room temperature 23°C ± 5°C (73°F ± 9°F).

Check the fuses and battery, and replace them if necessary.

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