Thanks for your reply. I purchased the 3425 for other reasons, but thought I could use to look at harmonics on a 480V 3 phase line we are having problems with.

Thanks for your response, I dont understand why I can not hook up my 3425 to 480v using a TA041?

I would like to connect to three phase 480V to monitor sine wave harmonics

I know that the spec for the 3425 is 400 volts. but I need to read information on a 480V line. is this possible?