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| Hacked:
Hello all, I am looking to buy current probe for my analog discovery 1 (I will probably buy new scope next year) :) I would mostly use it to hobby design smps and audio electronics. Was looking at micsig current probes: Micsig-CP2100A https://www.batronix.com/shop/measurement/probes/Micsig-CP2100A.html Micsig-CP2100B https://www.batronix.com/shop/measurement/probes/Micsig-CP2100B.html Micsig-CP503B https://www.batronix.com/shop/measurement/probes/Micsig-CP503B.html CP2100A has smallest bandwidth (800kH), but I remember that I was reading here that most CP2100A has better bandwidth than declared, closer to CP2100B. Don't know if this is still true. Micsig-CP503B has best specs but also significant price increase :D Would CP2100A be enough to see switching currents in 100kHz range? Best Regards |
| Martin72:
Hi, Since their bandwidth does not stop abruptly at 800khz, this should not be a problem.* It is important to know that the CP2100 is not so well suited for very low currents, which is not surprising with a 100A clamp. I had both 2100s and I think the price/performance ratio is very good. But they are not exactly small. My test thread: https://www.eevblog.com/forum/testgear/micsig-current-probe-cp2100b-tests-and-comparing/msg3063816/#msg3063816 I had also tested the CP503B: https://www.eevblog.com/forum/testgear/micsig-cp1003cp503-100mhz50mhz-current-probe/msg5275105/#msg5275105 Martin *)The bandwidth of a measuring device should be significantly higher than the signal to be analyzed. Example from practice: Investigation of a power PWM with 16khz, using the AP011 from lecroy as the current clamp. This had a bandwidth of 120kHz, the signal looked different than expected, with a Tektronix current clamp (2Mhz) the signal curve was as expected. |
| bdunham7:
The inputs of the Analog Discovery are fully differential if you don't use the BNC adapter, so as long as you observe the modest common mode voltage limits you can just use an appropriately sized resistor as your current probe. |
| Hacked:
I know that, but that's a hassle. And without BNC adapter analog discovery 1 range isn't to big (+/-25V). |
| Hacked:
--- Quote from: Martin72 on April 29, 2024, 07:00:03 pm ---Hi, Since their bandwidth does not stop abruptly at 800khz, this should not be a problem.* It is important to know that the CP2100 is not so well suited for very low currents, which is not surprising with a 100A clamp. I had both 2100s and I think the price/performance ratio is very good. But they are not exactly small. My test thread: https://www.eevblog.com/forum/testgear/micsig-current-probe-cp2100b-tests-and-comparing/msg3063816/#msg3063816 I had also tested the CP503B: https://www.eevblog.com/forum/testgear/micsig-cp1003cp503-100mhz50mhz-current-probe/msg5275105/#msg5275105 Martin *)The bandwidth of a measuring device should be significantly higher than the signal to be analyzed. Example from practice: Investigation of a power PWM with 16khz, using the AP011 from lecroy as the current clamp. This had a bandwidth of 120kHz, the signal looked different than expected, with a Tektronix current clamp (2Mhz) the signal curve was as expected. --- End quote --- So from your reviews I see that you are satisfied with CP2100B, but not with CP503B? Is CP503B worth almost double money than CP2100B? It has 50MHz bandwidth so that should be more than enough for switching on/off currents in smps? Or is better to just buy CP2100B. Damn, don't know what to buy :D |
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