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Current probe for Oscilloscope
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2X:
Hello,
I want to buy a good quality current probe for my oscilloscope to measure the pulses of a TIG (AC/DC) inverter machine. I found the two below. I look also and in the Tesetc company but I didn’t found a probe to measure 200A current. Have anyone to suggest something else?


Rohde-Schwarz:
R&S®RT-ZC02
R&S®RT-ZC03 (This has resolution 1mA)
https://www.rohde-schwarz.com/us/products/test-and-measurement/oscilloscope-probes/current-probes-for-oscilloscopes_63493-73797.html
https://scdn.rohde-schwarz.com/ur/pws/dl_downloads/dl_common_library/dl_manuals/gb_1/r/rt_zcxx/RT-ZC02-ZC03_Manual_en_03.pdf


Testec:
https://www.testec.de/en/products/product-categories/current-probes/
alm:
200A is not so common for bench scopes. That's probably why you couldn't find a Testec probe. What kind of bandwidth (lower and upper) do you need? What is the rise time and duty cycle of your pulses?

I would look carefully at derating curves. For example the R&S RT-ZC02 is rated for +/- 200A or even +/- 2000A DC, or 1000A RMS AC, but if you look at the derating curve at page 40 of this datasheet, the rated peak current at 10 kHz (sinusoidal) is only about 50A.

The Tektronix TCP404XL is quite a bit better in both max current over frequency and bandwidth (see figure on page 55 of the manual). But you're not going to like the price. The Siglent CP6500 looks like it might also work but is not cheap either.

If you can live without DC and moderate bandwidth, then there are substantially cheaper options from multimeter manufacturers as industrial current clamps with BNC or banana plug output.
2X:
The MAX frequency as I know is about 500Hz, so I beleive it would bo ok. Siglent is quite expensive. Thanks for your reply.

R&S®RT-Zxx HIGH VOLTAGE AND CURRENT PROBES
https://scdn.rohde-schwarz.com/ur/pws/dl_downloads/premiumdownloads/premium_dl_pdm_downloads/5214_2362_22/RT-Zxx_High-voltage_dat-sw_en_5214-2362-22_v2400.pdf

R&S® RT-ZC02
https://www.batronix.com/shop/measurement/probes/Rohde-Schwarz-RT-ZC02.html

Siglent CP6500 5 MHz 500 Amp Current Probe
https://www.siglent.eu/product/7962341/siglent-cp6500-5-mhz-500-amp-current-probe
 
nctnico:
Another option is to use a current shunt and an isolation amplifier. Or use a Rogowski coil. From what I've seen these are regulary used when dealing with measuring welding current waveforms.
2X:

--- Quote from: alm on July 16, 2023, 02:54:18 pm ---200A is not so common for bench scopes. That's probably why you couldn't find a Testec probe. What kind of bandwidth (lower and upper) do you need? What is the rise time and duty cycle of your pulses?

I would look carefully at derating curves. For example the R&S RT-ZC02 is rated for +/- 200A or even +/- 2000A DC, or 1000A RMS AC, but if you look at the derating curve at page 40 of this datasheet, the rated peak current at 10 kHz (sinusoidal) is only about 50A.

The Tektronix TCP404XL is quite a bit better in both max current over frequency and bandwidth (see figure on page 55 of the manual). But you're not going to like the price. The Siglent CP6500 looks like it might also work but is not cheap either.

If you can live without DC and moderate bandwidth, then there are substantially cheaper options from multimeter manufacturers as industrial current clamps with BNC or banana plug output.

--- End quote ---

"If you can live without DC and moderate bandwidth, then there are substantially cheaper options from multimeter manufacturers as industrial current clamps with BNC or banana plug output."
Do you have something to suggest me from a good company or whatever do you beleive it is worth?
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