Products > Test Equipment
Hioki 3237 5.5 digits meter teardown
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coromonadalix:
Just grabbed this on Fleabay, i was curious  of its internals

199999 count Bench DMM

Dac : Burr Brown  ADS1250U     20 bit ??

Next to it  IC22 :  An OPA2277        10µV, 0.1µV/˚C, High-Precision, Low-Power Operational Amplifier

Reference : An LT1027     thks @AVGResponding    Very Low Drift: 2ppm/°C Max TC Precision reference with extra-low drift         
                                                                           For sure not the LM199 399 or even an LTZ1000  loll   :-DD

Main Cpu : Renesas H8S/2134F        Web says : Microcontroller for Office Equipment Applications

Eeprom i think  :  8 pins Soic    3771    if someone find a datasheet ???  i could try to read it ?
                                              0026     
                                                343



ADC clock :  An EXO 3 clock module  18.432 Mhz  ??

Precision Resistor : Caddock 1776-C4

Display Drivers : 2x  TD62083F  8CH DARLINGTON SINK DRIVER

The front panel plastic is very thin / brittle, i dont think it would survive some impact,  sure its now yellowish

Under the pcb i only see some transistors, no other ic's,  i dont want to dismantle more than this

For sure they have put the cpu far away from the front panel ??
coromonadalix:
Reserved

Seems more an ADC on steroids than a real meter ??

They exist as 3237, 3238, 3239    way overpriced for what they are ...


I did start a thread about Hioki calibrations ... but never got any responses

No schematics

Just some user manual and code snipets : Labview C# C++ Mathlab Python VBA
dobsonr741:
The Manual - no schematics however.
Martin72:

--- Quote ---no schematics however.
--- End quote ---

Hioki also consistently does not give out anything, and if the devices have not been manufactured for ages... :P
coromonadalix:
some of theses 3237  goes down to 2001  ???
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