[Elecraft] (KX3) Voltage display (solved)

[Holger Schurig]

I tx you a "thank you" !  :-)



2013/4/16 Bruce Beford <bruce.beford at myfairpoint.net>

> Rich, AC7MA explained this quite well on the KX3 Yahoo group just last
> week:
>
>
>
> The batteries and external supply are connected at the '+' end. The
> external
> supply '-' is connected to KX3 ground, but not battery '-'.
>
> With an external supply connected that's higher than the battery voltage,
> the battery '-' will be a positive voltage with respect to ground, so
> battery voltage is the difference between the measurements of the two
> terminals. If no batteries are installed, the battery '-'
>
> terminal is at ground potential, so the display for PS and BT will be the
> same. When the KX3 is running from batteries, the reverse isolation diode
> for the batteries puts the battery '-' slightly below ground, which will be
> read as 0V, so PS and BT readout will also be the same in that case.
>
>
>
> 73,
>
> Rich AC7MA
>
>
>
> > Now just the question arises why the BAT display shortly raises to the
> > input voltage if you connect the power? ...
>
> > Holger, DH3HS
>
>
>
>
>
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