Well you can size the wiring properly by referring to the tables in AC43.
Nobody here seems to know what reference the
German glider manufacturers use, if any. Bernard
could presumably just ask Schleichers.
In any case, just measure at the battery
terminals and at the instrument with the same
load. As Bob Dircks says, there can be drop in
switches, connectors and fuses.
In any case what matters operationally is what
voltage appears at the instrument because that is
what will stop it working when it gets too low.
So I'd just set the offset to zero.
I've seen too many dodgy wiring installations. If
you have to wiggle the connector to get it to
work it is no good and probably won't work for long.
In one memorable instance about 20 years ago a
club had some vario problems. After investigating
they found 12 volts at the battery and 8 volts at the instrument.
After re-wiring they let me know that everything
now worked fine, including the radio which hadn't
been working properly SINCE THE FIRE DOWN THE BACK 18 MONTHS BEFORE.
Mike
At 11:38 AM 3/5/2017, you wrote:
naturally the germans involved would...ask a
silly question, even a rhetoric one.
On 5 Mar 2017, at 11:58 AM, Mike Borgelt
<<mailto:mborg...@borgeltinstruments.com>mborg...@borgeltinstruments.com>
wrote:
Refer to AC43 but measure anyway.
Who knows what the German glider manufacturers do with wiring.
Mike
At 10:52 AM 3/5/2017, you wrote:
Hi Bob
Many thanks for your quick reply.
I realise that the size of the wiring comes
into it but I was working on the assumption that
the electronic specialists amongst us would
know what wiring the manufacturers usually
use for this applications.
BTW, Iâm not blaming the wiring, I just need
to arrive at a realistic figure for the offset in
my LX 9000.
Kind regards
Bernard
On 5 Mar 2017, at 11:11 am, Bob Dircks
<<mailto:dircks....@gmail.com>dircks....@gmail.com> wrote:
In order to calculate the voltage drop, we
would need to know the exact conductor size of the wiring.
Of course the circuit is actually going to be 22m in length.
You can (fairly) easily measure the voltage
drop with a voltmeter, to measure the voltage
at both locations while the load is applied.
Normally one would not expect a significant
drop at 0.9 A over 11m of a wire chosen carefully for the job.
However, all joints in the wiring, including
switches and breakers need to be considered, before blaming the wiring.
Bob Dircks
On Sun, Mar 5, 2017 at 11:32 AM, Future
Aviation Pty. Ltd.
<<mailto:ec...@internode.on.net>ec...@internode.on.net > wrote:
Good morning all
Today I have a question for the electronic specialists on this forum.
My new ASH 30 Mi has approx. 11m of
electrical cable between the avionics battery
in the top of the fin and the front instrument panel.
What voltage drop can be expected at the
panel if the combined avionics draw approx. 900 mA?
This information would be helpful to properly
adjust the voltage offset in the LX 9000.
Many thanks in advance for your help and assistance.
Bernard
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quality soaring instrumentation since 1978
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tel: 07 4635 5784 overseas: int+61-7-4635 5784
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