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| 1000 A current probe for spot welder measurement |
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| Martinn:
--- Quote from: TizianoHV on October 16, 2023, 05:21:45 pm ---Would be interesting a small review / test of this current transformer. Seems good for the price. What's the smallest current it can measure?... --- End quote --- Not sure if you are replying to my or to mk_s post. Regarding the Tamura sensor: The datasheet is pretty specific: https://www.tamuracorp.com/clientuploads/pdfs/engineeringdocs/L06PXXXS05.pdf Anyway I have not remotely high enough current capable calibration sources. Maybe I could check what the noise in my flying probe setup would be. Sensitivity is 1.5V/800A = 1.875 mV/A. Did a quick check: Sensor on 1:10 passive probe on scope 20 MHz BW limit gives about 1 mV RMS noise. So 5 A would be easily resolvable. However DC offset is 2.5 V, so minimum DC current level your scope can show depends on the offset capabilities of your scope frontend (unless you go to AC coupling of course). With an AM502 set to 100x gain and DC-10 kHz bandwidth, 200 mA are about the minimum you can see in a single ended connection (did not have differential cabling at hand). The AM502 also can (in the 100x attenuation setting) remove the DC offset (in a DC coupled measurement). |
| TizianoHV:
wops, yes, I was interested in your Tamura CT. Thankyou for the tests. |
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