[Test-Equipment] Tektronix PS 503A

[Brian Harris]

David,

Thank you for the quick reply.  I have only a TM503, 3 slot cabinet.  In it is a DM501 DVM and the PS503A.  The LED remains on in the middle and right most slot.  I did not try it in the left most slot.  Maybe the TM503 is not compatible with the PS503A?  I'll try to find a manual for both and lube the power switch and put some Fader Lube on the pots.

Thanks again,

Brian Harris, WA5UEK
cell 214-763-5977
email cosmophone at yahoo.com


________________________________
 From: David <davidwhess at gmail.com>
To: Discussion of Electronic Test Equipment <test-equipment at mailman.qth.net> 
Sent: Tuesday, September 25, 2012 6:56 PM
Subject: Re: [Test-Equipment] Tektronix PS 503A
 
On Tue, 25 Sep 2012 16:01:40 -0700 (PDT), Brian Harris
<cosmophone at yahoo.com> wrote:

>I just bought and received a Tektronix PS 503A power supply and have a few questions and needs.  
>
>First, it appears to be operating....at least there are adjustable voltages available on the +/- 0-20V outputs.  The RED LED in the middle of the printed box that says 400mA max is always lit.  Is this correct?

Yes.  The plug-in needs to be used in a high power slot, like the
right most slot of a TM504, to support 1 amp and then the LED will go
out. 


>Second, the overcurrent LEDs flash a little when I move the current limit pots.  I suspect this is normal and may be dirty pots.  I expect they should only be on constantly when there is an actual overcurrent situation.  

Sounds like dirty pots.

>Third, the 5V output has voltage present when I press the button titled OUTPUT, which behaves like it's a momentary on switch rather than a toggle on/toggle off switch.  Is it supposed to be momentary action or is this switch defective? 

I would clean and lubricate the power switch.
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