Because meters go out of adjustment. Even with the correct mercury
battery, I put many 1s on the tester and find that over the years they
are off by maybe 1/4 or 1/2 stop.
The bottom line is that the silver oxide conversion allows you to use
the 1.5V battery, (as does the MR9) but it is not an automatic fix for a
meter that was already inaccurate. The mechanical adjustments always
have to be done last.
John
Frank van Lindert wrote:
>
> On Mon, 05 Apr 1999 17:07:27 -0400, John Hermanson <omtech@xxxxxxxxx>
> wrote:
>
> >Of course, after the diode is put in and the battery box is modified,
> >the meter will still have to be recalibrated mechanically.
> >
> >John
>
> Why, John?
>
> The silver-dioxide cell (1.50 V) and the series-diode (-0.15 V) give
> exactly the same total voltage as the old mercury cell (1.35 V).
>
> I can't see a reason why the meter circuit would respond differently
> if the applied voltage is the same...
>
> Does the factory-made MR-9 also make a recalibration necessary?
>
> Frank.
>
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