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Hantek CC-65 AC/DC Current Probe Teardown and Testing

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dcac:
I found the ut210e schematics and it does not seem to have any frequency compensation in the diff amp. From picture of the PCB C13 does not seem to be populated.



dcac:
Red line = Spice simulation without any caps - BW is now about 115Khz in high gain mode. Question is how much more noise this would let through.



dcac:
And for good measures - 10Khz square wave.

Red trace = without any caps in the 272 diff amp.




Remember this does not show the actual response with the HALL sensors - only what the amplifier look like in a spice simulation.

dcac:
New Schematic with caps values added and some notes.

EDIT: Newer version of the Schematics here: https://www.eevblog.com/forum/testgear/hantek-cc-65-acdc-current-probe-teardown-and-testing/msg3545210/#msg3545210

 CC-65 CLAMP4.pdf

Zhao:
The Hall sensor marked SE is likely to be HE12AF1D12U, a knockoff version of HW101A. "E" indicates that its sensitivity is in bin E (228-274mv @ 50mT).

Marking of HE12AF1D12U chip:

Taken from http://blog.sina.com.cn/s/blog_7d2f0f0a0100tv93.html

Datasheet of HW101A:
https://www.akm.com/content/dam/documents/products/magnetic-sensor/hall-element/in-sb-ultra-high-sensitivity/hw101a/hw101a-en-datasheet.pdf

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