Hackers' Pub

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niconiconi @niconiconi@mk.absturztau.be

10/6/2022, 11:18:32 AM

Public

Whoever invented this method must be a genius. This was a portable calibrator for high-voltage partial discharge testing. Because of HV, it was battery powered and insulated from the mains. But sometimes the test signal needs to be phase-locked to the 50/60 Hz AC mains frequency, and the solution was:

"with a photocell that synchronizes the instrument with the ambient lighting of the laboratory."

#electronics

Figure 6.11 Portable calibrator
[shows a simple 100 mm x 100 mm test instruments with some pushbuttons, an on/off switch, and a photodiode at the top]

5. It can be synchronized with the test voltage; this is usually performed with a photocell that synchronizes the instrument with the ambient lighting of the laboratory.

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