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Monthly Archives: January 2013
Nixie Glow
My first ever digital multimeter was a Heathkit IM-1212. I built it from a kit when I was a teenager (thanks, Dad.) A whopping 2½-digit, 200-count unit with 1% ± 1 digit basic DC accuracy. Barely a step up from … Continue reading
Fluke 83-III Rotary Switch
It’s a fact that you can repair as many multimeters with a bottle of isopropyl alcohol and some Q-tips (cotton buds), as you can with a soldering iron. In many cases, malfunctions can be fixed by careful disassembly and cleaning … Continue reading
Yokogawa 7534-03 Multimeter
Japanese equipment maker Yokogawa made handheld DMMs for HP before HP became Agilent. This 3200 count 3½ digit Yokogawa-branded model is very similar in appearance to the HP E2378A model. Unlike the HP, this unit adds a high-impedance ‘ADP’ mode, … Continue reading
How To Remove the Knob on a Fluke 170-series DMM
Fluke 170-series rotary switch knobs can be removed for cleaning and/or lubrication. The area under the knob can collect dirt and gunk, which will lead to rough operation and possibly even damage to the end stops. But it may not … Continue reading
Fluke 77-IV Copper Corrosion
The fourth generation of the classic Fluke 77 shares the same basic design and circuit board as the rest of the 170-series (175, 177, 179). Apparently a common problem with these circuit boards is the appearance of a white powdery … Continue reading