[Mgs] Cooling issue, revisited

[Paul Hunt]

The stabiliser output is so slow that analogue meter damping usually has no 
effect i.e. the needle swings up and down fully or almost so between 0v and 
12v.  You wouldn't *want* a digital meter to be in-sync with the switching, 
or it would read 12v all the time or 0v all the time, and either indication 
would lead you to think the stabiliser was faulty.  The point I was making 
is that a test-lamp, analogue meter and unsynchronised digital meter all 
give you a simple go/no go indication of whether the stabiliser is working 
or not, which is all you need, the test being just whether the output *is* 
switching between 0v and 12v.

Cheers,
PaulH.

----- Original Message ----- 

>   There is a potential point of confusion when using
> digital meters.  The meter display does not
> continuously represent the measured parameter like an
> analog meter (damping ignored) but rather, it updates
> itself at a quarter-second to one second rate.  This
> typically isn't much of a problem because most things
> we measure are static or better put, steady-state.
>   The (somewhat) rapidly pulsing stabilizer output is
> NOT steady-state and not in sync with the meter's
> sample-and-hold circuit.  Therefore, it is easier to
> evaluate the output of an old style analog meter or
> even a test light when evaluating a pulsing source.