harvey4(at)earthlink.net
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 Posted: Sun Sep 07, 2008 9:41 am Post subject: Another alternator question |
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Also at low RPM (1000-1200) I'm seeing a "pulsing" of the ammeter,
which I took to mean the alternator is on the cusp of turning on and off.
(Also the RPM is pulsing too suggesting the alternator load is
turning on and off).
Does the alternator turn off at low revs? What dictates the
switching? Can I affect the switching point?
Thanks
Neil
At 06:10 PM 9/6/2008, Robert L. Nuckolls, III wrote:
| Quote: |
<nuckolls.bob(at)cox.net>
At 05:49 PM 9/6/2008 -0400, you wrote:
>
>
>When I first start the engine, and then engage the alternator, the
>Van's ammeter flips over to +20 for a few seconds.
>Then it gradually descends to zero and settles a needle's width on
>the -ve side of zero, where it sits for the duration.
>If I turn the alternator off, the ammeter goes to -10 so I know
>it's sensing something, but the slight -ve reading in flight bothers me.
>
>Do you think it's just an adjustment issue on the gauge, or is
>something else going on?
Van's ammeter is an electronically signal conditioned instrument
with scale and offset adjustment pots inside. It sounds like
it's just out of calibration. This is ONE of the reasons
I don't recommend battery ammeters.
If you also have a voltmeter . . . THIS is the true guardian
of flight confidence. If the voltage is staying above
battery charge levels 13.8 minimum, 14.2 nominal, 14.6 maximum
then all is well in Electronville.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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