Products > Test Equipment
HIOKI 3522 LCR Meter teardown
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DaJMasta:
Very interesting!  Those suspected MC1496Ds are actually just more DG411DYs, but there very well could be that section under the digital board in an area not pictured by these pics.  I remember being a little baffled when looking over it, so it's sort of nice to hear that it uses a fairly complex measurement scheme  :D

I remember being real surprised to find local regulation in the form of 78XX and 79XX regulators in those larger all-plastic TO-220 style cases.  I suspect they use some more modern variant with better stability and PSRR, but I hadn't really considered them as good regulator choices for high sensitivity analog sections.
ogden:

--- Quote from: DaJMasta on December 05, 2018, 05:55:16 pm ---Those suspected MC1496Ds are actually just more DG411DYs,

--- End quote ---

Two pairs of DDS+LM361 are strong hint that indeed it is IQ (sin/cos) mixer system and they use DG411DY as mixer (demodulator).


--- Quote from: Michel95200 on December 05, 2018, 08:48:55 am ---Hioki 3532 seems technically closed to the 3531.

--- End quote ---

Could you share it's schematics?


--- Quote ---Three DDS are present, one for sine/cosine generator and another one for undersampling clock generation.

--- End quote ---

Third DDS (ic202) looks like test signal going to Hcur.

[edit] I don't know how legit that seller and his offer is, but look at those piles of LCR meters!
hoangduongo:
Hello,
It might not be totally related. but does anyone here have the schematic of the Hioki 9268/9269 DC bias modules that go with the 3522 LCR meter?
At the very least, the basic principle and feasible working plan will also be much appreciated, as I am fancy to imitate one for my 3522.
Thanks a lot!
Duong
coromonadalix:
you have Hioki 3522 on Ebay

Even low as 4xx$ usd dollars for parts


This seller has many of them ??
https://www.ebay.com/itm/Used-Hioki-HIOKI-3522-50LCR-1Pcs/173558354050?hash=item2868e25082:g:0QQAAOSwtM1brCao
hoangduongo:
Coromonadalix,
I don't think I fully understand your question.
I already have the 3522 meter (purchased from a local factory liquidation), now I'm looking to copy/build the DC bias modules (like the 9268/9269), as the ones appear on ebay are even more expensive than what I paid for my 3522.
Thanks, Duong
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