Monroe-electronics Electrostatic Voltmeter - Isoprobe® - model 279L Instrukcja Użytkownika Pobierz pdf (Strona 17)

Page 14

SECTION 7

TROUBLESHOOTING

PRECAUTIONARY NOTE

Model 279 is a non-contacting voltmeter. The potential of the probe will attempt to follow the potential

of any object within the field of view of the sensitive electrode (up to

3400 volts) when the instrument

is operating. In the interest of operator safety and also to reduce high voltage stress within the

instrument, it should be left in the STANDBY mode whenever it is not being used and particularly when

the probe will not be “looking” at a surface potential of less than 3000V.

A. General:

BEFORE ATTEMPTING TROUBLE-SHOOTING TECHNIQUES, CONSIDER THE FOLLOWING:

1. Attempt to determine mode and cause of failure. If you broke it you probably have some idea

how. If someone else did, try to get as many details as possible.

2. Check control settings. Review the CONTROLS and INDICATORS section of this manual.

3. Check power line voltage. Be sure that VOLTAGE SELECTOR is in the correct position.

Check fuse.

4. Look for obvious physical damage (charred parts, loose connections, broken solder joints,

broken circuit board, etc.)

5. Check calibration. If it appears that the instrument is uncalibrated, review the ADJUSTMENT

section of this manual.

6. Always rectify the cause of the problem.

B. User checklist:

1. INDICATION—Power switch at rear of instrument is ON—no display illumination.

a) Check display button recessed behind front panel. Should be latched in to turn display

on. See Paragraph 3B.

b) Check fuse(s) and line voltage settings. See Appendix II.

INDICATION—Power switch is ON—no sound from probe. NOTE: A faint 1kHZ tone should

normally be heard emanating from the tuning fork chopper in the probe.

a) Check to be sure that the probe connector is firmly locked in its receptacle.

b) Check for physical damage to probe (dents in case, cut cable, dirt or dust inside of

aperture) that would prevent the tuning fork from operating.

INDICATION—Arcing between probe and surface under test.

a) GAIN too high at close spacing—system unstable.

b) GAIN too low at close spacing—system cannot follow fast high voltage transient

c) Surface voltage beyond range of instrument.

INDICATION—Operator receives shock from probe.

a) DO NOT TOUCH metal body of probe while in operation.

b) Check for frayed or damaged insulation.

INDICATION—Unit does not seem “calibrated”.

a) There is no “calibration” necessary from an operator standpoint. The instrument is

factory calibrated and certified so. Otherwise, calibration is recommended following

repairs to the instrument or annually unless more frequent calibration is required by

contract.

b) Probes are not calibrated; they either work or they don’t work.

c) Review the steps in the OPERATION Section, Section 4.

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