alt swit
Well ...as a follow up to this I installed the three position switch OFF,
BAT and BAT-ALTas recommended in the Z16. Low and behold, the amp reading
issue seems to have gone away or at least before I was having about one
event per flight and since 3 p[ositioon switch installed no events per
flight.
Why would a three position switch be functionally any different from two
separate switches?
William Daniell
LONGPORT
+1 786 878 0246
On Fri, May 15, 2020 at 8:11 PM Gilles Thesee <gilles@elixir-aircraft.com>
wrote:
> Le 15/05/2020 =C3- 23:33, William Daniell a =C3=A9crit :
>
>
> Will,
>
> There is a law in physics measurements : the more parameters you measure,
> the more you scratch your head^^!
>
> That said, you wrote that your bus - or battery - voltage remained within
> the "green" limits during each of the events. So no reason to suspect the
> voltage regulator.
>
> The only item capable of supplying more than the 21 amps of the alternato
r
> is the battery, but while doing this its voltage would sag due to interna
l
> resistance (Cf Ohm's law for a generator). 70 amp is no trifle.
>
> So the main probabilty is an ammeter artefact. The best way to measure
> currents is with a Hall effect sensor, as the shunt may induce side effec
ts
> in your circuits with high currents.
>
> But first things first, without independent and reliable voltage and
> possibly current measurements or logging, no assumptions can be made.
>
>
> Concerning disconnecting the battery while running, not sure it would be
a
> safe thing to do, especially in flight :
>
>
> --
> Best regards,
> Gilles
> http://contrails.free.fr
> http://lapierre.skunkworks.free.fr
>
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