Inductive pickup from an old timing light safe for 4225?

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Inductive pickup from an old timing light safe for 4225?

Postby Trent » Fri Jan 27, 2017 4:10 pm

The subject line says it all. Does anyone have a clue what voltage these old things deliver when connected to secondary ignition. I've got one laying around. If I understood correctly, Scanner Danner (YouTube guy) was using one for a trigger on a Picoscope. If I was betting, I would say far less than 200 volts.....

Wow, what a tool this Picoscope is! Tested a couple things on my CRV yesterday for the first time. Got my eye on a 600 amp clamp on.

Thanks, Trent
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Re: Inductive pickup from an old timing light safe for 4225?

Postby STC » Sat Jan 28, 2017 4:04 am

Measure it on the scope, use an attenuator just to be on the safe side.
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Re: Inductive pickup from an old timing light safe for 4225?

Postby Dave Hill » Sun Jan 29, 2017 12:04 am

These inductive pickup things, clamp around the high tension lead (spark plug wire in American speak) & harvest a signal from the electromagnetic interference, or Radio frequency interference (RFI) that is generated during the creation of the ignition event. In reality your inductive pick up is not too far removed from a simple antenna & as such, it is not exposed to any significant voltage.

Having said that, you need to make sure that your setup has some allowance for those stray 30,000 volts that often make a break for freedom.

Here is a relevant post from the distant past on Autonerdz.....

http://www.autonerdz.com/cgi/yabb2/YaBB.pl?num=1273431933/0#0
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Re: Inductive pickup from an old timing light safe for 4225?

Postby STC » Mon Jan 30, 2017 10:45 pm

you need to make sure that your setup has some allowance for those stray 30,000 volts that often make a break for freedom.


Going equipped with Known Good HT Lead(s) would minimise the risk perhaps ?
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Re: Inductive pickup from an old timing light safe for 4225?

Postby Dave Hill » Wed Feb 01, 2017 12:53 am

STC wrote:
you need to make sure that your setup has some allowance for those stray 30,000 volts that often make a break for freedom.


Going equipped with Known Good HT Lead(s) would minimise the risk perhaps ?


True, but things are only "known good" until they fail, which everything ultimately does. . :D
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Re: Inductive pickup from an old timing light safe for 4225?

Postby STC » Wed Feb 01, 2017 2:51 am

until they fail, which everything ultimately does.


The negativity ? :D :D :D
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