cop voltage and current

I have a 2014 prius plugin.

I would appreciate knowing the primary and secondary voltages of the cop (coil over plug) feeding the sparkplug. I would also appreciate knowing the secondary current.

my goal is to create a voltage divider that I can use to view my secondary cop voltage and current
on my lab(not car) oscilloscope. I will probably make the voltage divider out of two capacitors vs using
a resistor voltage divider.

to capacitively connect to the secondary I was thinking of using my inline spark checker extension
that connects to the spark plug in the head and then connect the extension to the cop via a coil tester
light via a silicon wire which is about 12 mm thick. I was then going to clamp onto the outside of the
silicon wire with a T clamp which runs to my voltage divider and then to my bnc connector that connects
the signal to my scope. I am not sure how i am going to measure the current other than maybe indirectly through the primary power lead going into the cop.

any advice is welcome.

I am guessing (no facts...just pure guess) that the voltage gets as high as 30,000 volts and that the current is much less than ma.

Thank you for responding.

bil

 

Morning John !

Unfortunately, being an engineer, I love looking at data. Your view that Techstream offers enough
data is a valid point. If I suspect a bad cop, the software will id my problem.

But as mentioned, I would like to look at the oscilloscope traces to view what is happening at
the time the coil discharges its energy and for the remainder of the spark cycle. For some reason
the traces interest me.

I am afraid that I may damage my non-auto scope with the high voltage. That is why i am seeking
the information I am asking in this forum. Interestingly I found it difficult to find this information
for any car manufacturer. I appreciate that spark plug gap defines the voltage (The coil will keep increasing the voltage until a discharge occurs), but with a manufacture's defined gap, that voltage
should be fairly well defined. Maybe the lack of information on coil voltage at time of discharge indicates I do not understand something that would be nice to know (to hell with fixing the car).

so please put up with me...You are correct, as most always, that I really do not need to go this far.

Have an exciting day !

 

Wow !!!!! Thank you for being so helpful. I especially appreciated your reference to "Ignition System Measurements Procedure". I respect your approach. I never thought to look at SAE procedures. I should take that approach with future questions. Brilliant. Thank you for taking the time to respond with an answer that is very helpful.

 

wow. again! Thank you for your generosity. It takes time to research this stuff. to type it out.
I know you guys don't like emotion....but I feel so grateful. I wish I knew how to return the
generosity. I just don't know enough.

thank you. Thank YOU.

bil

 

Elektroinengieur !!! It is apparent that either you have exceptional research skills or you
already had an interest in ignition systems. If the latter, can you share some interesting stories
that you might have had while working in that field? bil

 

ChapmanF......you have a wonderful sense of humor......

I am truly overwhelmed by people trying to help me....and people having a sense of humor.
This kind of generosity does not happen to me very often. Thank you all