Vintage DMM- Hioki 3200-50

An ebay find made its way into the lab- an industrial quality DMM from Hioki, made in 1984! The meter has some pretty good specs as shown in this datasheet:

  • 3.5 digit (1999 count), 0.5% on DC voltage
  • 20uA DC current range with 10nA resolution
  • 1G input resistance on 200mV range
  • Drop proof to 1 meter
  • Dust sealed.
  • 500 hours battery life using 2 AA
  • Neon indicator of overvoltage Continue reading

Keithley 197 Microvolt DMM in pictures

Today’s quick visual teardown  is of an 1984 vintage Keithley 197 microvolt DMM, Despite considerable age, it’s still quite alive and kicking and very useful for measuring low currents and voltages.

ESC Boston / Design East pictures

I’ve just returned from Boston, where I poked my nose into Design East/Embedded Systems Conference. This was a very brief stop, limited to expo floor and panel discussions

Elektronika MK51 calculator teardown

Today we have a teardown of a Soviet calculator Elektronika MK 51( Электроника МК 51) for those familiar with the language.  It was bought new in 1993, worked (sorta) for a few years and just drove me absolutely nuts with its lack of any reliability. The design is supposedly a clone of Casio FX-2500

Front view

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