Hi All,
Found a very simple way to do preliminary testing of my HV diodes:
o---------R-------o--->|----o
a b
AC
120v c d
o---------R-------o--->|----o
Checked with a simple galvanometer (vintage 1897) as follows:
1) Quickly touched meter leads to terminals a & c needle vibrated.
2) Quickly touched meter leads to terminals a & d needle swung left
3) Quickly touched meter leads to terminals b & c needle swung right
4) Quickly touched meter leads to terminals b & d needle did not move
Conclusion: Diodes are rectifying with good reverse blocking , (at least at 120V.AC).
That gives me confidence to build the circuit.
Matt D.
-----Original Message-----
From: Antonio Queiroz <acmdequeiroz@xxxxxxxxx>
To: mddeming <mddeming@xxxxxxx>; Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Wed, Aug 13, 2014 8:28 pm
Subject: Re: [TCML] Testing HVdiodes
Em 12/08/2014 23:21, mddeming--- via Tesla escreveu:
> Hi All,
>
>
> I recently picked up a couple of diodes (5" black plastic rectangular rods)
rated 200 ma @ 80 KV. A standard diode checker doesn't seem to work with ones
this big. Is there an easy way to test them before they go in the circuit?
>
I like to test HV diodes with an electrostatic generator and an
electroscope:
https://www.youtube.com/watch?v=lQKQAewFJ-8
In that case I was only interested in the leakage. The electroscope
saturates at 5 kV. Testing at 80 kV would be more difficult.
Antonio Carlos M. de Queiroz
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