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Old 12th Nov 2019, 10:08 pm   #4
Dekatron
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Join Date: May 2009
Location: Linkoping, Sweden
Posts: 953
Default Re: AVO CT 160 Regulated Grid Voltage Supply

Good to know that no other tests are affected.

Also good to know that the SET~ circuit had been modified as that was my main concern when it comes to this regulator modification - that circuit relies on the two different AC voltage levels for the mean value of them to get the other measurements correct in the normal CT160 but only on one voltage in the CT160A.

Since the mains voltage can hardly be said to be 50Hz or 60Hz nowadays as it is sometimes not regulated well, as well as it is full with other frequencies overlaid on it for communication purposes of for instance electricity billing meters, I think that your circuit will work well on other frequencies as long as there is no bandwidth limit.

How well does the regulator withstand a short from the anode, or any other electrode, into the grid electrode (or short to ground)?

I guess that not many people run it on anything else than 50Hz or 60Hz except me when I ran some tests with the help of some military dynamotors (motor/generators) that could be used at 50Hz, 60Hz and 440Hz.

I wanted to check the difference between the voltages and frequencies as AVO stated that some small difference could be seen as well as the compensating capacitors being there for that reason. I also wanted to check what the difference was between the not so nice sinusoidal voltage from the mains outlet compared to a pure sinusoidal voltage from the dynamotor. Everything looked much nicer on the scope with a pure sinusoidal voltage compared to the regular mains voltage but the measurements wasn't affected much as long as the tester was properly calibrated, well within what AVO said it would work as.

/Martin
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