how to measure hight tension ?

[jasko_jacker]

Hi,
I should measure a voltage >300 v at 40 KHz, I know that the cheap tester can measure voltage only around 50-60 Hz, I have an oscilloscope but not HT probe. there is a solution to have a good measure ?
thanks

[budm]

Re: how to measure hight tension ?

How about building Voltage divider circuit? Is the circuit in the hot side?

[jasko_jacker]

Re: how to measure hight tension ?

I try with this circuit
https://www.repairfaq.org/sam/hvprobe.htm
but I don't know if a spike can damage the oscilloscope

[PeteS in CA]

Re: how to measure hight tension ?

There are handheld DMMs available that are true RMS and 100KHz bandwidth.

Fluke 287

Keysight U1252 or U1253

[eccerr0r]

Re: how to measure hight tension ?

My old Tek scopes are good for up to 400V P-P though I'm not sure why they have such a high limit, 8 divisions at 5V/division is nowhere near 400V.

My Vu Data scope goes to 20V/division with 8 divisions, and thus one would hope that it can deal with 160V P-P.

If you have a 10:1 scope probe, that's all that's needed for at least my scopes to deal with a 300V P-P signal...