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| Micsig CP1003/CP503 100MHz/50MHz Current Probe |
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| Martin72:
Hi, I can confirm that there is a small ripple: https://www.eevblog.com/forum/testgear/accurate-low-amp-current-probe-advice/msg5690313/#msg5690313 |
| Kean:
--- Quote from: folays on October 26, 2024, 12:39:29 am ---Hello again, I salvaged a mains' heater 1000 Watts measured at 55.32 Ohm, so around 0.54 Ampere for the same 30 V. Below two capture, I set the DC load (Siglent SDL1020X-E) to the same CC than expected heater's resistor (0.55 A). (again I moved the trigger out of the voltage level, I didn't want to post-analysis, so I wanted the scope' to roll freely) First one shows the DC load, 62 mA of Amplitude (and Pk-Pk). Second picture shows the pure resistive load, 11.294 mA of Amplitude (and Pk-Pk). Sorry for the disturbance :(, it was the DC load, the CP503B works better without an electronic DC load. Best Regards, --- End quote --- Great! I was just reading your earlier post and thinking to ask if you had a hair dryer or small fan heater you could check for resistance. Some years ago I bought a handful of 50W and 100W power resistors in values like 1, 3.3, 5, 10, 22, 47, and 100 ohm, and mounted some on various heatsinks. I have at least 6 programmable DC Loads and a few 2/4 quadrant power supplies, but a simple resistive dummy load can be very handy. I have picked up some surplus resistors very cheaply over the years. I think a large bag of 22 ohm 3W and tray of 10 ohm 25 W resistors have proved particularly handy. I can wire these up in various series/parallel combination to make different loads. A hot water heater element I bought was not expensive and turned out to be about 16 ohms and can run several kW in a bucket of water. I've been planning to buy another to get 8 ohms. These resistors can have some inductance that should be taken into account depending on what circuit you connect them to. |
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