[Diy_efi] Testing an inductance coil.

Wed Aug 17 16:46:37 UTC 2005

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In a message dated 8/17/2005 12:31:42 P.M. Eastern Standard Time,  
WSCowell at aol.com writes:

A neon glow lamp will *not* work in the configuration described.  In  series 
with the plug, yes.  Across a current transformer, no.  The  voltage developed 
by the CT will be modest, certainly not the 90 volts and  upwards required to 
"strike" a neon.

Will

 best way to test inductance coils is with some sort of current  ramping low 
amps probe. this will show the current usage pattern which can be  compared to 
known good waveforms for similar types of coils. snap-on and sevral  other 
companys make low amp probes for testing ignition coils,injectors coils  etc etc 
etc. you will not however see turn to turn shorts etc without a low amps  
probe and using a ohm meter is just about worthless. if you want to see if the  
coil is charging discharging put it into a circuit where it would operate  and 
watcht the trace of the charge and inductive kick back state to see if  it 
actually works.  

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<DIV>
<DIV>In a message dated 8/17/2005 12:31:42 P.M. Eastern Standard Time,=20
WSCowell at aol.com writes:</DIV>
<BLOCKQUOTE=20
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  <DIV>A neon glow lamp will *not* work in the configuration described.&nbsp=
; In=20
  series with the plug, yes.&nbsp; Across a current transformer, no.&nbsp; T=
he=20
  voltage developed by the CT will be modest, certainly not the 90 volts and=
=20
  upwards required to "strike" a neon.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Will</DIV></FONT></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>&nbsp;best way to test inductance coils is with some sort of current=20
ramping low amps probe. this will show the current usage pattern which can b=
e=20
compared to known good waveforms for similar types of coils. snap-on and sev=
ral=20
other companys make low amp probes for testing ignition coils,injectors coil=
s=20
etc etc etc. you will not however see turn to turn shorts etc without a low=20=
amps=20
probe and using a ohm meter is just about worthless. if you want to see if t=
he=20
coil is charging discharging&nbsp;put it into a circuit where it would opera=
te=20
and watcht the trace of the charge and inductive kick back&nbsp;state to see=
 if=20
it actually works. &nbsp;</DIV></FONT></BODY></HTML>

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