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5.4. Voltmeter
By pressing the
key, the instrument will measure the voltage
effectively applied to the element being tested.
5.5. HOLD
The
key allows to hold the last performed reading on the display, at
the moment this key was pressed, without interrupting the test. When this
key is pressed again, the equipment updates the resistance and time
values. The
key led and the letter H on the display indicates that the
function was activated.
5.6. Filter
When isolation measures are carried out in transformers next to high-
voltage lines (though disconnected from them during measurement) the
capacitive effect causes the appearance of significant voltages over the
isolation resistances. In order to minimise this effect, the equipment has a
filter, which is activated when pressing the
key. Is advisable to press
this key before starting the measurement if the resistance is higher than
100 MΩ.
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