On Tue, 25 Jul 2006 20:03:01 -0700 (PDT), John Chung wrote:

>I haven't used a current clamp before so here goes.
>Can the current clamp detect the rpm of the car? Just
>hook the clamp to the spark plug line and use the Hz
>to determine the RPM? Is the clamp sensitive enough?
>

You wouldn't ordinarily use a clamp-on current meter for RPM
measurements. I don't know if that would even be possible.

Many automotive timing strobes use a clamp-on inductive pickup to
trigger the flash circuit when one particular sparkplug fires. A
timing mark on the crankshaft is used to set the ignition timing. 

Most tachometers, though, connect across the points and calculate the
RPM from the frequency of the points opening and closing.


Regards, Bob

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