[Test-Equipment] Tektronix PS 503A

[David]

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.