This is my translation of the German article form above, english is not my mother tongue, so please be indulgent to my mistakes.
The test voltage is set by the ratio of the voltage divider left.
Put in the capacitor you want check, after that actuates the switch.
Now the capacitor will be charged.
In order to reduce the time taken to charge the capacitor
a momentary switch can connected in parallel to the 2.2 MegOhms resistor.
As soon as the capacitor is charged, open the switch.
Now starts the discharging (depending on the insolation).
The test jacks, the wires and the componets arangement requiers a a good insulation,
preventing current leakage.
The 4.7nF capacitor in parallel to the test capacitor must be a high quality type.
This capacitor is needed for test capacitors less than 1nF,
because a new charging current impulse would be to small to be displayed on the magic eye.
The 10 Kiloohms potentiometer being so set as to the light bars of the magig eye are about half closed.
(This corresponds to an infinite insulation resistance value)
After that, the capacitor to check is connected to the test jacks.
As soon as the switch is actuated the capacitor woll be charged.
A poor insulation resistance increases the grid voltage in positive direction,
this leads to a reduction of the light bar lenght.
If the lightbares completely disappears, the testes capacitor is unusable.
The highest test voltage (200 Volts) gives the highest display sensitivity.
A insulation resistance value of 500 MegOhms corrosponds to a decline of about 4 Millimeters on the light bar.
If measurement of insulation resistance values less than 500 MegOhms required,
the 10 Kiloohms potentiometer must be turned up.
LeakageTester.png
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