And here is the second part of the $1 multimeter deal from the last Hamfest. Together with Micronta 22-201U analog meter reviewed here I picked up this 3.5 digit digital one of a similar age. The poor thing looks like it had a rather difficult life!
The latest addition to our vintage collection is a Keithley 130A handheld DMM from the mid-eighties.Keithley is not well known for its handheld DMMs, or at least I’ve never heard of them. It’s a 3.5 digit 0.25% instrument made in mid 1980s
Another ebay find- a vintage Keithley 172 multimeter. The datecodes on the parts range from 1978 to 1984, placing the final assembly somewhere in mid-1980s. It seems fully functional, but could use a bit of a calibration to regain its past precision.
Today’s repair subject is a Fluke 8840A bench DMM that has some display troubles. It would work normally for a bit and then start fading out. A bit later it would come back and work again. The initial thought was that the display simply had too many run hours and is worn out. In that case a replacement is required and is not a very cheap solution. Continue reading →
Another Hamfest find is the Sinclair Radionics PDM 35 digital multimeter. Having grown up with ZX Sinclair Spectrum clone, and reading a lot about Sir Clive Sinclair and his creation I wasn’t about to walk by this. If the look of it is a bit calculator-like, that’s because they actually reused a calculator enclosure! This was a cheap model, selling for 33 pounds in the 70-s and 80s
Welcome to my blog of all things electronic. Let’s start with a family picture of my DMMs.
Left to right: ALDA M-838 DMM circa 1994; Wavetek Meterman 35XP- a handy DMM with a very annoying beep; Fluke 8842A- a high end instrument made in 1994 and still looking brand new inside (I’ll have to do a separate post on that), and finally my shiny new Agilent U1252A. You can never have too many of them- by the time you look at input current and voltage and then on the output currents and voltage, four DMMs seems like a bare minimum.