Isolating a power souce

[Rheilly Phoull]

G'Day All

I am using some of the chinese DVM's in my vehicle to monitor a solar setup,
(volts and amps). However they cannot be used powered directly from the
vehicle batteries etc.
It occurs to me that mebbe a small double wound transformer used in a
switching mode followed by the usual regulation and smoothing etc could be
used to feed a small 9v recharge battery and as the supply for the meters.
Would that be isolating the supply for the meters or have I missed something
??

 

[David L. Jones]

G'Day All

I am using some of the chinese DVM's in my vehicle to monitor a solar setup,
(volts and amps). However they cannot be used powered directly from the
vehicle batteries etc.
It occurs to me that mebbe a small double wound transformer used in a
switching mode followed by the usual regulation and smoothing etc could be
used to feed a small 9v recharge battery and as the supply for the meters.
Would that be isolating the supply for the meters or have I missed something
??

Easier to just buy an isolated DC-DC converter like the C&D/Newport
type.
www.dc-dc.com
Not as cheap as rolling something yourself though I guess.

Dave

 

[Andrew M]

jump onto the TI website and sample yourself some DCP011212 or similar....

-Andrew M
Top poster extraordinaire

 

[budgie]

If you find that the battery negative is connected directly to the negative
probe

invariably they aren't, and such a link usually causes (at the least) the
display to under- or over-range

 

[Phil Allison]

"Jasen Betts"

If you find that the battery negative is connected directly to the
negative
probe you could power that meter from the battery (using an apropriate
regulator)

** What did I tell you - Jasen ??

About what to do when you do not know something.



......... Phil