Am 21.02.2015 um 21:21 schrieb Peter Hollenbeck:
>
> The higher the value the lower the output.
>
This usually means there already is a voltage divider (or at least a
parallel resistance) in the measurement device and you are superposing
another. You could measure it and calculate the outer pair, but if 1k
gives you the right reading, stick with it.
>
> I don't get it and doubt I ever will.
>
Chances are your input isn't properly filtered, so you are measuring AC
noise on the line. You mentioned an inverter, which is prone to produce
a lot of noise on both its output *and* input.
Try this circuit
12V in )---------+------------------( 12V out
|
|
)
) 100 windings on a iron core
) (a rusty nail suffices)
|
|
<
> 1k
<
|
+-------+---------(---->
| |
< === 1µF to measurement device
> 1k --- 10V
< | .--(---->
| | |
GND in )---------+-------+------+--( GND out
Kind regards
Jan
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