[Test-Equipment] Tektronix PS 503A

[David]

I have a few TM500 series plug-ins at this point.  I usually buy
nonfunctional ones at low prices and repair them for fun and practice.
I use a TM501 mainframe with the cover removed to do diagnostic work
on them.

On Tue, 25 Sep 2012 18:14:31 -0700 (PDT), Brian Harris
<cosmophone at yahoo.com> wrote:

>Thank you.  While I have lots of test equipment this is my first venture into modular units.  Someone gave me the TM503A and the DM501.  I bought the PS503A because it was cheap and now I'm in the market for a frequency counter 503A or 508x.
>
>Thank you 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 7:41 PM
>Subject: Re: [Test-Equipment] Tektronix PS 503A
> 
>The smallest mainframe with a high power slot is the TM504.  The TM503
>is compatable with the PS503A but it will be limited to 400mA in every
>slot.
>
>On Tue, 25 Sep 2012 17:33:11 -0700 (PDT), Brian Harris
><cosmophone at yahoo.com> wrote:
>
>>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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