H/P Bench Supply Question

[Paul Schreiber]

Hey! You are stealing my first tutorial article idea for the website! So here is a condensed version:

1) HP supplies marked +, G, and - ARE NOT negative (dual) supplies.
2) The GND means earth (the third prong on the power cord) ground.
3) The - means the "signal ground". Gee, it happens to be the "earth ground". No minus here!!

I spend 5 hours as a freshman in EE labs trying to get my Electronotes VCA to work off a stupid HP supply marked + G - on the front. When a grad student expalined how HP marks their supplies, I almost heaved it through a window.

Check around Thursday of next week at

www.why.net/users/paults

for the Tutorial page. I will discuss HP supplies in detail when dealing with ground.

FYI: the S+ and S- are Sense leads to compensate for voltage drop across the load.

And now we know S- is really ground.

Paul Schreiber
Synthesis Technology


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From: 	john miller[SMTP:moron5000 at juno.com]
Sent: 	Sunday, March 09, 1997 9:41 AM
To: 	Bode at veda.is
Cc: 	Synth-DIY at horus.sara.nl
Subject: 	H/P Bench Supply Question

I recently got a used  Hewlett-Packard 6200b DC Power Supply and I'm 
having trouble getting a +, -, and GND at the same time. If I connect my
mutimeter from + to - I get a + voltage (correct voltage). If I connect
from + to GND I get  0.00v reading. I have noticed on the back of the
supply there is a strip connector with A1-9, S-, -, Gnd, +, S+, and 
A10. Do I need to make a connection on the back to use the supply as a
+,-,Gnd type?  I had been using a power supply I pulled out of an old
ARP and wondered why everything I have built since I got the H/P supply
wouldn't work!

Thanks
John