Delta 4000 Instruction Manual download pdf (Page 105)

81331 Rev 01 Nov 2010

Maintenance and Calibration

Maintenance

Maintenance should be performed only by qualified persons familiar with the

hazards involved with high-voltage test equipment. Read and understand Section

2, Safety, before performing any service.

Routine maintenance is all that is required for these test sets. The cables and

connector panel should be inspected frequently to be sure all connections are

tight and all ground connections intact.

DISCONNECT the MAINS plug before cleaning.

The appearance of the test set can be maintained by occasional cleaning of the

case, panel and cable assemblies. The outside of the carrying case can be cleaned

with detergent and water. Dry with a clean, dry cloth. The control panel can be

cleaned with a cloth dampened with detergent and water. Do not allow water to

penetrate panel holes, because damage to components on the underside may

result. A household all-purpose spray cleaner sprayed on cloth can be used to

clean the panel. Polish with a soft, dry cloth, taking care not to scratch the

display screen cover. The cables and mating panel receptacles can be cleaned

with isopropyl or denatured alcohol applied with a clean cloth.

Contamination of some parts of the high-voltage circuit, in particular the high-

voltage cable terminations and its mating panel receptacle, may show up as a

residual PF(DF) meter reading. Cleaning of these sensitive parts will remove the

leakage paths which cause the unwanted leakage current. Treat the high-voltage

cable with care. Keep it clean and do not subject it to abuse, such as dropping or

crimping.

Calibration

During the warranty period, no calibration should be necessary. Contact the

factory if there is any suspected problem.

The overall accuracy of capacitance and power factor (dissipation factor) at 10

kV should also be checked at least once a year against Megger’s Capacitance and

Dissipation Factor Standard (Cat. No. 670500-1). This will ensure that the entire

high-voltage circuit is functioning and calibrated properly.

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Delta 4000 Instruction Manual Page 105