Author Topic: Time Electonics - Model 505 D.C Currrent Source  (Read 263 times)

Mr Eastwood

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Time Electonics - Model 505 D.C Currrent Source
« on: April 12, 2019, 07:49:42 AM »
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
« Last Edit: April 12, 2019, 08:00:56 AM by Mr Eastwood »
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SeanB

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Re: Time Electonics - Model 505 D.C Currrent Source
« Reply #1 on: April 13, 2019, 04:37:06 AM »
Very nice looking unit.

ProBang2

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Re: Time Electonics - Model 505 D.C Currrent Source
« Reply #2 on: April 16, 2019, 04:20:05 AM »

That is mean!    >:(

Somehow it would be interesting to me, what the connected DMM shows...    :'(
If you think, my english is bad, then you should read my french. :(

Mr Eastwood

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Re: Time Electonics - Model 505 D.C Currrent Source
« Reply #3 on: April 27, 2019, 01:52:56 AM »
That is mean!    >:(  Somehow it would be interesting to me, what the connected DMM shows...    :'(

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)

Hey! Frisbee! Far out!

ProBang2

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Re: Time Electonics - Model 505 D.C Currrent Source
« Reply #4 on: May 01, 2019, 11:24:27 PM »
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
If you think, my english is bad, then you should read my french. :(

Mr Eastwood

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Re: Time Electonics - Model 505 D.C Currrent Source
« Reply #5 on: May 02, 2019, 06:03:12 PM »
Hi,   

"When was the current source built? My guess would be: Pretty much 40 years ago."
Quite possibly, they used the same case design I think for a good few years.

"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? "

VERY good point!  looking at the service manual there is only 1 range for current and that is 2A;  so a big jump like that looked quite odd;  so i left both meters on for about 5 hrs; then re-did the readings for #1 and #2;  but this time both meters were NULL'd and then i switched on the FILTER.

Basically much better readings.



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ProBang2

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Re: Time Electonics - Model 505 D.C Currrent Source
« Reply #6 on: May 02, 2019, 10:15:04 PM »

Happy to see the second unit works fine, too!   :)
If you think, my english is bad, then you should read my french. :(