Fluke 12B, Руководство по обслуживанию

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12B/18/7 Series
Service Manual
3-6
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 50ºC for 2 hours.
Performance Tests
P
Warning
To avoid electric 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. Referring to Table 3-2 for the Fluke 7-300 or 7-600, or Table 3-3 for the Fluke 12B
or 18, put the meter in the function and range shown for Test 1.
3. Apply the input from the appropriate source. The reading on the display should be
within the MINIMUM and MAXIMUM values shown in Table 3-2 or 3-3.
4. Test the remaining functions and ranges.
Table 3-1. Required Equipment
Equipment Minimum Specifications Recommended Models
DMM Calibrator DC Voltage: 0-600V
Accuracy:
±
0.25%
AC Voltage: 0-600V
Accuracy: ±0.5%
Frequency: 50-400 Hz
Fluke Models 5700A, 5500A,
5100B, or equivalent
Decade Resistor Resistance: 1.0-40 M
Ω
Accuracy: ±0.25%
General Resistance RDS-77B
and 41B or Fluke 5500A
Decade Capacitor Capacitance: 0-1.000
µ
F
Accuracy: ±0.5%
GenRad 1412-BC or Fluke 5500A
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