Oldest piece of working and still used test equipment ?

[Michael A. Terrell]

N_Cook wrote:

I decided to break into my 1000V DC, 10 Gigohm insulation tester, today. No
particular reason , just curious, as still in perfect working order.
Had to break a seal to get inside, never needed repair by me or previous
owners, just my adapting to 9V nicad use rather than pair of unobtainable
4.5V batteries.
Made in Austria , Norma Isolationmesser 667 001
Date inside is 15 December 1965, i thought it would be 1970s
Just disintegrated foam inside, compenentry like Siemens AD130, AC153 and
OC75 all fine. Whenever I check calibration with a 1G glass cased resistor
it is the same cal setting, no switch problems or anything else.

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:

<http://cgi.ebay.com/Sensitive-Research-Inst-Corp-WVA-Voltmeter-Ammeter_W0QQitemZ230378927042QQ>


--
You can't have a sense of humor, if you have no sense!

 

[Jeroni Paul]

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:
http://es.geocities.com/podernixie/nixie/index-en.htm

It uses some digital 74xx ICs from around 1972, a selenium rectifier
and of course nixies for display.

 

[Ansgar Strickerschmidt]

Am 22.09.2009, 16:59 Uhr, schrieb Joerg <invalid@invalid.invalid>:

Resistors are staunch parts. As a teenager I worked in a company that
made specialty electric gear. One of my jobs was to braze huge brake
resistor arrays for locomotives, the size of a closet. They could get
red-hot and still perform their job.

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

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*** Musik! ***