Hello, sorry if this is not the correct sub forum, it does not appear there is a topic for isolation.
First, I am pretty clueless when it comes to electronics. I'm a Mechanical Engineer, so circuit design is not my strong point. I can find my way around a circuit and I can read a circuit diagram better than most of my ME friends, but I still struggle with a lot of concepts. Hopefully someone can help me solve my, seemingly simple, problem.
I am measuring the secondary voltage on an automobile ignition system using a 1:1000 clamp-on inductive voltage probe. The probe works great and gives me a good signal on my scope. The problem is that the probe lead is only 3 feet long. In certain situations, the probe and the scope can be up to 30 feet apart. Simply adding extra cable on the lead wire (BNC connected RG 59/U coax cable) works, but it changes the output of the probe. The maximum voltage changes from 20,000volts to 17,000 volts when adding 15 extra feet of RG 59/U cable. Plus, the signal begins to ring whent the transient response is fast enough. I believe this is caused by the extra capacitance and inductance of the additional cable. This change in the signal is what I am trying to fix.
My idea is to isolate the probe from the 30 feet of extension cable using an ADUM1100 iCoupler Digital Isolator. I don't know if this will work or not. The maximum voltage that needs to be isolated is 40v (40,000v max secondary voltage stepped down x1000). I also need a chip that is a push in type, not a solder in type so I can use it on a breadboard.
That is the background and my idea for a solution. Please let me if you can think of any solution to my problem or if you have any questions.
Thanks in advance.