I need to measure high voltage in transmission electron microscope (in electron gun)
very high voltage can be measured by Cable fault Locator/The instrument "Megger"
There are two possibilities (it's a DC voltage). The simplest: directly, using an electrostatic voltmeter (which cover your interesting range) or indirectly, using a resistive divider and a low voltage voltmeter as measuring device. You must know the "scale factor" of the divider (factor by which the value of the instrument reading is to be multiplied in order to obtain the value of the input voltage). Take care on the insulating distances and suitable connexions!
Hi Anto,
how precise do you have to measure ? If you want to be precise the resistive divider should be the choice. But you have to consider the additional current. We normally use e.g. 5-10 GigOhm so you have approx 10uA measurement current. you can buy these resistors from different manufacturers but you have to pot them in e.g. epoxy together with your cable that is connected at the "high" end to get the insulation distance Marian mentioned.
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