Voltage measurement in a GTAW welding application, with HF start

[Wilfried_71]

Hi all,

I would measure the voltage of a GTAW power supply. The start of this power supply is a HF type. There's a lot of HF signals (something like 10kHz to 80 Mhz) that goes in the wires.

Is there somebody who has a background in this application ? I need in fact a kind of HF filter to protect my acquisition card. I will put obviously galvanic isolator but it seems that it's not suffisant.

Thanks

Regards,

[Romain_P]

Hi Wilfried,

Do you try to use a ferite core? I think it could be usefull for the measurement of a GTAW power supply.

Regards,

[Wilfried_71]

Hi,

I didn't try yet because the level of this HF start is up to 20 kV. So, if i try something and it doesn't work, I will burn my acquisition card ... I need help from someone who already managed to measure this.

Regards,