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Sinclair PDM 35 DMM

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reagle:
Just wanted to brag- went to a Hamfest locally and stumbled on this gem- a 1970s vintage Sinclair PDM 35 multimeter! The design shared enclosure with their calculator series :) Teardown is coming up

Zad:
Sinclair are (despite their horrible web site) still going and making test gear. They changed their name via mergers and acquisitions a few years back to Thurlby Thandar Instrument (TTI). The people who made the current probe that Dave reviewed a few days back.

http://www.tti-test.com/

IanB:
What are the headline specs on this device?

I remember the time when Sinclair was actively developing and selling devices like that, but I didn't have the money to buy them so I could only drool over the magazine adverts.

reagle:
I grew up with a Sinclair ZX Spectrum clone, so things designed by his company will always have a special place for me :)
Yet to power it up- it looks full of discrete components and needs a bit of cleanup first. User manual has a schematic in it- that will be handy

Specs:
Features:     3.5 digit resolution,
10M ohm input impedance
 DC Volts: mV to 1000V 1%
 AC volts 1V to 500V 1%
DC Current 1nA to 100mA 1%
resistance 1 ohm to 10M ohm 1.5%-2.5%

reagle:
Well, what do you know- it even works. Missing one segment on all digits, but otherwise reads the voltage as well as my Fluke 8842!

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