Choosing a high-current probe. Tek CT-4 DC Bucking Coil. Power source?

[ballsystemlord]

Hello,
Recently I was looking at getting a lower-cost high current AC/DC probe. I found Pico's TA167, R&S's HZO51, or I could use an older Tek current probe and their CT-4 adapter.

I can't seem to find any derating info for either the Pico or R&S's probes. The manuals are rather sparse in terms of graphs. Are they not based on a coil that needs derating?

Tek's CT-4 is very very detailed. But how do I power the DC Bucking Coil? Like, they give a voltage/amperage, but that's spec'd per DC amp and I have no clue how to power the DC Bucking Coil with the appropriate frequency/amplitude DC value so that I get the correct response for DC current. Although their older probes can measure DC current, is the CT-4 designed to only measure AC current?

Thanks!

PS: When I say "DC current" I'm referring to pulsed DC. I'm not planning on using an oscilloscope to measure continuous DC current. I'd use a clamp meter for that.

[Jim Narem]

The tek CT-4/CT-5 is AC current only and needs a current probe (A6302 or P6021).  The DC bucking coil kills off the magnetic field from a continuous DC current in the conductor.  It's driven by a CC/CV supply.  If you need DC response at high current, you'd want the Tek A6303 along with the AM503 amplifier and the 500 series power supply.  It's an expensive and temperamental solution.

[ballsystemlord]

Okay, what about the Pico's TA167 and R&S's HZO51? I couldn't find any derating info for them in the manuals. I'll happily reach out to them, but before I do so does anyone have some info on the derating of those probes?

Thanks!

[Someone]

I can't seem to find any derating info for either the Pico or R&S's probes.

Derating of what? They're low (kHz) frequency probes and will probably have no issue withstanding higher frequency at the rated current.