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Electronics => Beginners => Topic started by: manytoolsmike on March 31, 2021, 03:14:41 am

Title: Probe the Primary and the secondary of a transformer
Post by: manytoolsmike on March 31, 2021, 03:14:41 am

Hello everyone,

I am trying to compare a 40 kHz signal before and after it passes through an output transformer to step up the voltage. The primary signal is 12 Vac from the H-bridge the secondary is 200 Vac  and drives a large ultrasonic transducer. The power is 5 watts.

Im assuming I cant probe the primary and secondary at the same time without shorting them, is this correct? I guess this is a reason to use a differential probe? can I use the differential probe on the secondary and a passive probe on the primary?

Thank you for taking the time to read this. I appreciate your help.

Mike.

Title: Re: Probe the Primary and the secondary of a transformer
Post by: PartialDischarge on March 31, 2021, 03:31:46 am

If the primary comes from an H bridge then you also need a diff probe, so 2 differential probes for both of pri and sec

Title: Re: Probe the Primary and the secondary of a transformer
Post by: bob91343 on March 31, 2021, 03:58:45 am

And be careful not to exceed the common mode voltage ratings of the probes.

Another way is to use transformers to couple to the scope but you need to make sure those transformers will faithfully transfer the signal without loading.