Megger TDS40, Operating Manual, Page: 36 / 71

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4.3 Starting the Test / Location
After the system has carried out all necessary settings which takes a short period of time,
the high voltage can be enabled.
Fig. 16: Switching on high voltage
It depends on the following conditions whether or not HV can be switched on using the
respective pushbutton (Fig. 3, item 10):
- the key "Emergency Off" (Fig. 3; item 1) is not activated,
- the key-operated switch "Interlock" (Fig. 3; item 11) is activated,
- both the Operating and the HV module are assembled in proper form.
If these conditions have been fulfilled, the "HVOn" key (green) (Fig. 3, item 10) lights up for
about 10 s and can be activated during this time. Afterwards, the "HVOff" key (red) (Fig. 3,
item 9) lights up. Under maintaining of the predetermined charging parameters the test
voltage will be regulated to the adjusted test voltage level.
At the analogue indication instrument (Fig. 3, item 2) and on the display (Fig. 3, item 3) the
level and the polarity of the test voltage are represented. In addition, the leakage current of
the test object is indicated on the display (Fig. 3, item 3).
By default, the measurement values for the voltage and the leakage current are updated
every 5 seconds at a defined moment (in the VLF mode directly before the start of the
polarity reversal. These logged measured values are displayed in square brackets (e.g.
[10.1 kV]) and remain in the display until the next moment of the next measurement.
Fig. 17: Display of the logged measurement values
VLF mode
20kV
15min
11:42
[20.1kV]
[0.13mA]
Running . HVOff?
VLF mode
20kV
15min
0.0kV
0.00mA
Prepared . HVOn?