| Products > Test Equipment |
| Hantek CC-65 AC/DC Current Probe Teardown and Testing |
| << < (6/33) > >> |
| Mechatrommer:
not on the pcb, i marked earlier only to indicate the connection to it. hall effect sensor is to sense magnetic field so it must be near that metal core loop, so thats what you see, there are 2 of them as in the picture, nothing more. |
| maxspb69:
Maybe useful for someone... https://yadi.sk/i/qGA6hIVvvBYOPg |
| macboy:
--- Quote from: harrimansat on December 04, 2018, 01:30:44 pm ---The other HP clamp that I have is colsed loop with inductor and hall. I don´t know how this clamp works. There´s more hall sensors in PCB? --- End quote --- Your HP clamp is probably a much better instrument than this. Hall sensors have limited bandwidth; they work from DC to some 10's or maybe 100's of kHz. In contrast, a traditional current transformer can be designed to have 10's MHz bandwidth, but can't give output at DC. A high bandwidth AC/DC current clamp will combine both techniques, and use other interesting methods to give good measurements. For one thing, the core materials necessary for high bandwidth will saturate at a relatively low DC value, and will distort the waveform even with a DC bias lower than saturation. For that reason, those probes will use the Hall sensor output to drive a DC current into the sense coil (or another coil), to offset the magnetic flux created by the DC current. It will always try to drive the (low frequency component of) Hall sensor output to zero. Then, the magnitude of this "correction" current (not the Hall sensor output) is measured to give DC/LF current measurement, and is combined with the output from the coil for the AC/HF components, giving an overall AC+DC measurement. This gives a good DC current measurement linearity, even if the Hall sensor is non-linear, it prevents saturation of the core, it helps prevents DC current from magnetizing the core thus causing hysteresis errors, and it prevents DC bias from distorting the AC portion of the waveform. It's also why a "real" AC/DC current probe is so expensive. |
| KlausF:
Огромное вам Спасибо. я очень рад. |
| KlausF:
--- Quote from: maxspb69 on December 19, 2018, 07:03:55 am ---Maybe useful for someone... https://yadi.sk/i/qGA6hIVvvBYOPg --- End quote --- Огромное вам Спасибо. я очень рад. |
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