| 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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