# Using induction clamp to see ignition voltage spikes and DC current?

R

#### Ricky Spartacus

Jan 1, 1970
0
Im trying to display ignition voltages and DC currents on my oscope.
Ill be clamping the timing guns induction clamp onto one of the
ignition plug wires and hook the other end of the induction wires to
an oscope. I am hoping to see a voltage jump of some sort. Will this
work? And If I later clamp it around an alternator cable, being under
load, will I see at least 30A of DC currents?
TIA
Ricky

N

#### Neil Nelson

Jan 1, 1970
0
Im trying to display ignition voltages and DC currents on my oscope.
Ill be clamping the timing guns induction clamp onto one of the
ignition plug wires and hook the other end of the induction wires to
an oscope. I am hoping to see a voltage jump of some sort. Will this
work?

I doubt it, but experiment anyway.
Generally, if you want to see anything useful with any level of
resolution, you need a capacitive pick-up to view an ignition
waveform. Your #1 inductive clamp should work as a trigger
though.
And If I later clamp it around an alternator cable, being under
load, will I see at least 30A of DC currents?

Nope, you'll need a hall effect inductive clamp to measure
current.

J

#### Jim

Jan 1, 1970
0
Ricky said:
Im trying to display ignition voltages and DC currents on my oscope.
Ill be clamping the timing guns induction clamp onto one of the
ignition plug wires and hook the other end of the induction wires to
an o`scope. I am hoping to see a voltage jump of some sort. Will this
work? And If I later clamp it around an alternator cable, being under
load, will I see at least 30A of DC currents?
TIA
Ricky

You can see the plugs firing with just a couple loops around the plug
wires. You won't see much on the alternator as it's damped by the battery.

M

#### Mike Walsh

Jan 1, 1970
0
An inductive clamp will sense changes in the magnetic field produced by an electric current and can't be used for DC.

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