Troubleshooting; Power-Up Self Test; Overall System Check - Fluke 27 Service Manual

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User manual (30 pages)

Table Of Contents

Table of Contents

The following procedure requires that high voltages be

supplied to the UUT for calibration. Read the safety precautions

in the Fluke 27 Users Manual before performing the following

procedure.

1. Select the ac voltage function (G) on the UUT.

2. Connect the DMM Calibrator to the volts/ohms/diode-test input terminal on the

UUT.

3. Program the DMM Calibrator output for 2.7 V ac at 100 Hz.

4. Adjust R7 to obtain a display of 2.700 V ac ±0.001 V ac.

5. Program the DMM Calibrator output for 270 V ac at 10 kHz.

6. Adjust C4 to obtain a display of 270.0V ac ±0.1 V ac.

7. Program the DMM Calibrator output for 1000 V ac at 10 kHz.

8. Adjust C10 to obtain a display of 1000 V ac ±1 V ac.

9. Program the DMM Calibrator output for 27.00 V ac at 10 kHz.

10. Adjust C8 to obtain a display of 27.00 V±0.01 V ac.

11. Program the DMM Calibrator output for 2.700 V ac at 10 kHz.

12. Adjust C6 to obtain a display of 2.700 V ac ±0.001 V ac.

13. Program the DMM Calibrator output for 2.700 ac at 100 Hz.

14. Verify that the UUT display indicates 2.700 V ac ±0.017 V ac.

15. Switch off both the DMM Calibrator and the UUT. Disconnect the DMM Calibrator

from the UUT.

16. Refer to the instructions in paragraph 30-10 to reassemble the UUT after calibration.

3-22. Troubleshooting

Static discharge can damage CMOS components U1 and U2.

Follow the handling precautions for static sensitive

components given previously. Never remove or install

components without first disconnecting all inputs to the

instrument and turning the function selector switch to OFF.

Refer to Table 3-4 and to the schematics in Chapter 5 of this manual as necessary during

the following troubleshooting procedures.

3-23. Power-Up Self Test

When the function switch is moved to any position from the OFF position, the

instrument performs a power-on self test. All LCD segments are switched on while the

test is being performed (about 1 second), then the unit commences normal operation.

3-24. Overall System Check

If the LCD display segments do not light, or if other malfunction indications occur

during power-up or operation, perform the following overall system check.. All

measurements are taken with respect to common. The overall system check is helpful in

XWWarning

Caution

Maintenance