Voltmeter on the fritz

lowtops

 
Joined
Feb 24, 2005
Messages
554
Location
NC
I have a Craftsmen digital voltmeter. I was testing the spark plug wires/coil on an old motorcycle I have and I think I screwed it up.
I connected the positive lead to the spark plug wire and grounded to the engine case. Hit the starter and the display went haywire and then blank. I checked and replaced the fuse, put in a new battery and still nothing.
I discussed this with my neighbor and he told me you cannot test "pulsing" power sources with a digital voltmeter, you have to use an analog.

Is this correct?
Is my voltmeter toast?
 
Joined
May 6, 2003
Messages
29
Location
Corpus Chisti, Tx
Well, you probably overloaded the internal circuits of the voltmeter. Most voltmeters can't handle that high of a voltage that is being produced at the spark plug.

Jesse
 
Joined
May 10, 2008
Messages
293
Location
Spokane Wa.
Bummer

That is like 20k volts + no multimeter will stand up to that unless it has a high tension lead attachment. When i say no multimeter I mean common meter. like a Fluke 77 fluke 23 etc.
If you are lucky the fuse inside will blow on the fluke. I have seen it blown by peeps checking voltag with em set on ohms.
 
Joined
Jul 7, 2004
Messages
1,518
Location
EVERGREEN, CO, USA
Ah yes; 20k volts. Really wakes u up. Will also fry internal diodes and chips of voltmeters that are not eqpt with high voltage test leads.

U now have a gadget that can be used for target practice...
 

lowtops

 
Joined
Feb 24, 2005
Messages
554
Location
NC
Thanks guys, guess I'm in the market for a voltmeter.
 
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