Re: Resistance of ammeter caused voltage drop

From: John Fields (jfields_at_austininstruments.com)
Date: 03/16/05 

Date: Wed, 16 Mar 2005 03:31:45 -0600

On Tue, 15 Mar 2005 19:42:43 -0800, "Larry Brasfield"
<donotspam_larry_brasfield@hotmail.com> wrote:

>"Fred Bloggs" <nospam@nospam.com> wrote in message
> news:423796E7.3090905@nospam.com...

>> Or buy/modify a p.s. with external sense compensation,
>
>Spending money was an obvious option which
>I mentioned in several of its many forms. 

---
However, you never mentioned external sense compensation (using a
Kelvin connection at the load to supply feedback to the supply in
order to compensate for lead resistance) and had you known such a
thing existed you would surely have mentioned it as an "obvious
option".   
Now that the cat's out of the bag, though, I suspect you'll soon
become the expert you'd like us to believe you already were.
Here, I'll save you a little time on Google:
On power supplies supplied with external sense compensation there are
two terminals, one usually marked "+ sense" or something like that,
and the other one marked "- sense" or something like that.  In use, a
wire is connected from the "+ sense" terminal to the + input of the
load at the same point the supply lead is connected to the load, and
the "- sense" terminal is connected from the "- sense" terminal to the
- input of the load at the same point the supply lead is connected to
the load.  That way, voltage variations _at the load_ are sensed and
fed back to the supply where the supply voltage is automatically
adjusted upward to compensate for the voltage dropped across the
supply leads.  If sense compensation isn't needed, the sense terminals
are shorted to their respective supply outputs at the supply, and the
supply regulates the voltage at that point. 
You're welcome.
 
-- 
John Fields

Relevant Pages

  • Re: Resistance of ammeter caused voltage drop
    ... Kelvin connection at the load to supply feedback to the supply in ... On power supplies supplied with external sense compensation there are ... - input of the load at the same point the supply lead is connected to ... fed back to the supply where the supply voltage is automatically ...
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  • Re: Resistance of ammeter caused voltage drop
    ... >> On power supplies supplied with external sense compensation there are ... >> load at the same point the supply lead is connected to the load, ... the sense terminals ... >with cable and connection drops, ...
    (sci.electronics.design)
  • Re: Resistance of ammeter caused voltage drop
    ... >> On power supplies supplied with external sense compensation there are ... >> load at the same point the supply lead is connected to the load, ... the sense terminals ... >with cable and connection drops, ...
    (sci.electronics.basics)
  • Re: Resistance of ammeter caused voltage drop
    ... of remote sense power supplies is fatuous. ... > On power supplies supplied with external sense compensation there are ... > - input of the load at the same point the supply lead is connected to ... with cable and connection drops, ...
    (sci.electronics.basics)
  • Re: Resistance of ammeter caused voltage drop
    ... of remote sense power supplies is fatuous. ... > On power supplies supplied with external sense compensation there are ... > - input of the load at the same point the supply lead is connected to ... with cable and connection drops, ...
    (sci.electronics.design)