Delta 4000 Instruction Manual download pdf (Page 106)

81331 Rev 01 Nov 2010

A calibration kit is provided as an optional accessory. This allows for traceable

calibration locally without sending the unit to factory.

Factory calibration is of course also available. Contact your local Megger

representative for details

Recommended calibration interval is 1-3 years.

Troubleshooting

General Guidelines

This section provides general guidelines for basic troubleshooting of the

Delta4000. The Delta4000 undergoes rigorous testing before being shipped from

the factory; however, when it is subjected to various field conditions, there is

always the possibility of damage being done to the instrument or its cables. This

troubleshooting section does not attempt to cover all possibilities, but does list

suggestions that can be carried out in the field. There may be problems that

require the unit to be returned to the factory for repair.

If questionable readings are obtained, the first step is to check the calibration of

the Delta4000 using Megger’s Capacitance and Dissipation Factor Standard (Cat.

No. 670500-1). If the standard is not available, the next step is to test a specimen

with a stable known value e.g. the TTR capacitor or one of the capacitors in the

Megger capacitor kit. If such a specimen is not available, then perform the

following procedure for an “Open Air Test.”

Open Air Test

The purpose of this test is to check the overall functionality of the Delta4000,

including the high-voltage cable. The readings obtained show the stray signal

losses of the high-voltage cable.

1. Connect the wing nut ground terminal of the test set to a low impedance

earth ground using the ground cable supplied.

2. Connect the control unit to the high-voltage unit using the two

interconnection cables.

3. Connect the external interlock cables to the SAFETY INTERLOCK

receptacles.

4. Connect the high-voltage cable to the HV OUTPUT terminal of the

high-voltage unit (power supply). Be sure that the connector locks in

place.

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Delta 4000 Instruction Manual Page 106