Fluke Multimeter 21

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

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

Adjust R8 for a display reading of +3.000V dc ±.001V

Display Test (70/73 Series III below s/n 80810247 only): All display segments come on

Display Test (21/23/75/77 Series III only): All display segments come on

DC Voltage Test: UUT display reading is within the limits

AC Voltage Test: UUT display reading is within the limits

Resistance Test: Display reading is within the limits

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 - Multi-Product Calibrator

- Recommended Model - Fluke 5500A

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).

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

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