Fluke 12, Руководство по обслуживанию, Страница: 29 / 51

10, 11, 12 Multimeters
Service Manual
3-6
8. The LCD, switch assembly, slide-switch actuator, and elastomeric contact strips (J3, J4)
for the LCD and switch assembly are accessible and can replaced as needed. Do not
allow the LCD to get wet. Before installing a new LCD, make sure that all connector
contact points are clean.
CAUTION
Do not touch the conductive edges of the elastomeric strips or
the contacts on the switch assembly. If they are contaminated,
clean them with isopropyl alcohal.
9. Reassembling the meter is the reverse of disassembling it. After the meter is
reassembled, execute the PERFORMANCE TESTS to confirm that the meter is working
properly.
3-3. Cleaning
CAUTION
To avoid damaging the meter, do not use aromatic hydrocarbons or
chlorinated solvents for cleaning. These solutions will react with the
plastics used in the instruments. Do not get the LCD wet.
To clean the case, wipe it with a cloth lightly dampened with water and a mild detergent.
Wash the pca with isopropyl alcohol or hot deionized water and a soft brush. Do not use
detergent of any kind for cleaning the pca. The pca must be completely dry before the
meter is reassembled. Dry the pca with clean dry air at low pressure (<20 psi), then bake
it at 50
°
C for 2 hours.
3-4. Performance Tests
WARNING
TO AVOID SHOCK, DO NOT EXECUTE THE PERFORMANCE
TESTS PROCEDURES UNLESS THE METER IS FULLY
ASSEMBLED.
Use the PERFORMANCE TESTS to confirm that the meter is working properly. If the
meter fails any of these tests, it needs calibration (see CALIBRATION) or repair. The
equipment required is specified in Table 3-1.
1. Connect the calibrator to the [+] and COM jacks on the meter.
2. Refering to Table 3-2 for the Fluke 10 or Table 3-3 for the Fluke 11 or 12, put the
meter in the function and range shown for test 1.