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| High current pulse measurement |
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| nctnico:
--- Quote from: paul@yahrprobert.com on July 31, 2023, 03:32:55 pm ---I've heard of people doing it the modern way and digitizing the rogowski output and integrating in software, and given a fast enough sample rate and good shielding that seems to be a good solution. --- End quote --- I have implemented something like that for measuring energy in welding systems (tens of kA). It is nice to have a trigger signal to reset the integrator. But getting rid of the common mode noise from the welding inverter was a PITA though. |
| HighVoltage:
I have use Pearson current probes successfully for several thousand amperes and rise times of less than 100 ns Just make sure to insert an insulation ring into the circular opening. Pearson makes them as a special shielded version for fast pulses in the low ns range. But these have a real high price. |
| johansen:
20A/uS is rather slow, 12500hz at 1600 amps peak. The lem closed loop hall effect sensors with 100,000khz bandwidth should be good enough. Rowgowski coils will work too, and you can buy integrators for them that are accurate enough to make a dc measurement by simply wrapping the coil around the conductor (2 seconds approximatly). |
| slugrustle:
I'm not so sure the AMC3302 is fast enough for what you want. Double check the bandwidth, delay, step response, and rise time specs in the datasheet and application information. Also note that these isolated amplifiers have a noise hump that starts to rise at around 100kHz; see "Figure 6-27. Input-Referred Noise Density vs Frequency" in the datasheet. These AIT1500-SG and AIT2000-D70 units from Hangzhi at stratatek look promising, but I wish the spec sheets were more detailed. https://www.stratatek.com/product-page/hangzhi-ait1500-sg-1500a-high-precision-analog-current-transducer-10ppm https://www.stratatek.com/product-page/hangzhi-ait2000-sg-200a-high-precision-analog-current-transducer-10ppm |
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