I built a clock some years ago with the oldest components I could find. Not exactly test equipment but it does meter the time :) It is documented here:
It uses some digital 74xx ICs from around 1972, a selenium rectifier and of course nixies for display.
Sensitive Research Polyranger "Expanded Scale" Thermocouple Volt & Amp meter built some time in the '40s? and last calibrated in the '60s.
Similar to this meter:
-- You can\'t have a sense of humor, if you have no sense!
Am 22.09.2009, 16:59 Uhr, schrieb Joerg :
Well, ultimate accuracy is surely not an issue when talking of dissipating energy on a locomotive... allow for some 10-20% (or so) change in resistance value with temperature - who cares...
Ansgar
-- *** Musik! ***
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