Hello,
I am working on a capacitive pickup probe as:
As mentioned the 1000µF has to be 1000pF. This gives a reduction of 100:1 (measuring on 3KV --> 30V).
I would like to see the waves with a Bitscope BS05.
I plan to connect a scope probe with a second reduction 10:1 and so input signals will be in the range of 3V.
BUT if a spark is jumping over from the sparkplug wire to the probe, it could destroy the BS05 and possibly the PC hanging on it over USB.
I read some things about high voltage protection in combination with differential op amps here:
https://www.maximintegrated.com/en/app-notes/index.mvp/id/5724
where the author also mentions neon lamps and clipping circuits with zeners etc.
It seems this is also useful: https://datasheets.maximintegrated.com/en/ds/MAX13202E-MAX13208E.pdf
Anybody has experience with such a input protection circuits and dimensioning them?
Anyone uses this MAX serie in combination with classic input protection circuits?
I am working on a capacitive pickup probe as:
As mentioned the 1000µF has to be 1000pF. This gives a reduction of 100:1 (measuring on 3KV --> 30V).
I would like to see the waves with a Bitscope BS05.
I plan to connect a scope probe with a second reduction 10:1 and so input signals will be in the range of 3V.
BUT if a spark is jumping over from the sparkplug wire to the probe, it could destroy the BS05 and possibly the PC hanging on it over USB.
I read some things about high voltage protection in combination with differential op amps here:
https://www.maximintegrated.com/en/app-notes/index.mvp/id/5724
where the author also mentions neon lamps and clipping circuits with zeners etc.
It seems this is also useful: https://datasheets.maximintegrated.com/en/ds/MAX13202E-MAX13208E.pdf
Anybody has experience with such a input protection circuits and dimensioning them?
Anyone uses this MAX serie in combination with classic input protection circuits?
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