New toy- Yokogawa CL 220 clamp meter

The thing is tiny! Shown next to the EEVblog uRuller

The thing is tiny! Shown next to the EEVblog uRuler


I’ve been looking for a good clamp meter for a while now. While there is plenty of no-name cheap meters on Ebay, I figured I’d wait till something better “washes ashore”. So when a Yokogawa meter got caught in my ebay filters one day, I grabbed it. Yokogawa is a Japanese company, well known for their power measurement equipment. This meter has a nice mix of AC and DC current ranges fitting my low to medium current measurements needs. It is also a recent model, still being made and supported- a rarity in my lab setup of 20+ year old equipment Continue reading

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.