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HIOKI 3522 LCR Meter teardown

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Michel95200:
Hello
Hioki 3522 100kHz LCR meter uses traditionnal autobalancing technique with undersampling ADC. Main parts are:

* OPA2134 + BUF634 for transimpedance amplifier
* 5 range resistors selectable with relays TQ2-5V
* voltage and current range amplifiers use OPA2134 and NJU201 analog switches
* test signal generator uses AD9831A DDS
* test voltage level: multiplying DAC AD7945
* output buffer : BUF634
* measurements are performed using 16-bits ADC ADS7809U with undersampling technique
* undersampling clock uses another DDS IC AD9831A

ogden:
Nice job! What was motivation to reverse engineer schematics of this module? Any further plans? BTW you could increase contrast of pictures.

_Wim_:
Wow, very nice job. That must have been quite a bit of work!  :-+

Michel95200:
I am independant and for a part of my job I am an electronic designer for a well known european instrumentation company. For this work I make sometimes this kind of reverse engineering to see the technique used by competitors and the parts they use. I did the same for other LCR meters if some are interrested. It took me half a day to draw the complete schematic of this one. I would like to find a not working Keysight E4980A or the analog board only do to the same.

dr.diesel:

--- Quote from: Michel95200 on December 04, 2018, 10:03:03 pm ---I did the same for other LCR meters if some are interrested.

--- End quote ---

Very interested!  Hameg?

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