Older Technology > Older Technology
Time Electonics - Model 505 D.C Currrent Source
Mr Eastwood:
Another Ebay low cost ex-mod purchase to add to the collection; not too much to say other the unit looks good inside, no sign of any previous battery leaks. Very nice item, I look forward to playing around with it on the bench.
[edit]
Link to a similar unit https://www.vintage-radio.net/forum/showthread.php?t=126780
SeanB:
Very nice looking unit.
ProBang2:
That is mean! >:(
Somehow it would be interesting to me, what the connected DMM shows... :'(
Mr Eastwood:
--- Quote from: ProBang2 on April 16, 2019, 04:20:05 AM ---That is mean! >:( Somehow it would be interesting to me, what the connected DMM shows... :'(
--- End quote ---
ProBang, I know that was really mean of me, it was wrong wasn't it! :) SO to try make it up to you I have posted some readings;
the dial settings were set at: 4000 on .9999, 9.999 and 99.99 mA ranges respectively matching the images (left to right) or (top to bottom)
the meters used were: idm 305 (1), idm 305 (2), idm 305 (3) and solartron 7150 (1) and solartron 7150 (2)
ProBang2:
Hello!
Thank you for your efforts. It seems, the 505 DC current source is still pretty well in spec. :)
(Maybe a little on the low side, but that could easily caused by the resistance of the test leads and the current shunts. The tolerances of the DMMīs are added anyways.)
So I have to say: I am really very impressed from this device. :o
When was the current source built? My guess would be: Pretty much 40 years ago.
And works still fine...
I donīt expect such a long lifetime from the items, nowadays produced.
BTW: Regarding the readings from your second Solartron 7150: 0.29 mA, 3.88 mA.
Is there sadly a problem in the lower current range? ???
Greetings
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