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Ampmeter reading

 
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trigo(at)mail.telepac.pt
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PostPosted: Thu Nov 23, 2006 9:42 am    Post subject: Ampmeter reading Reply with quote
Bob et all

I installed a digital Ampmeter, connected to a 50mV Shunt which is installed in the #6 cable which comes from the alternator (Subaru engine) to my Exp Bus board.
I assume that this ampmeter indicates the current being produced by the alternator, obviously with the engine running.
But, every time I run the engine (stil at my garage, not yet flying), the ampmeter indication runs very quickly from, let's say 13.7 down to 8.2, then up to 14,6, again down and again up, very quickly.
Why am I geting this kind of reading?
Anything wrong or it's just indicating what it shoud?

Carlos
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tshank(at)core.com
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PostPosted: Thu Nov 23, 2006 10:13 am    Post subject: Ampmeter reading Reply with quote
Carlos,
Depends on what your looking for . If you want to know the current being produced by the alternator you have it in the right place and the readings might be right. If you want to know is my battery being charged or discharged you should put it in series with the lead from the battery that goes to everything except the starter. In this location you will know if you are in a sustainable condition. An alternator can be putting out it rated current but if your aircraft is consuming more than that you have a limited amount of airtime.
Tim Shankland

Carlos Trigo wrote: [quote] (at)font-face { font-family: Tahoma; } (at)page Section1 {size: 612.0pt 792.0pt; margin: 72.0pt 77.95pt 72.0pt 77.95pt; } P.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0pt; FONT-FAMILY: "Times New Roman" } LI.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0pt; FONT-FAMILY: "Times New Roman" } DIV.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0pt; FONT-FAMILY: "Times New Roman" } A:link { COLOR: blue; TEXT-DECORATION: underline } SPAN.MsoHyperlink { COLOR: blue; TEXT-DECORATION: underline } A:visited { COLOR: red; TEXT-DECORATION: underline } SPAN.MsoHyperlinkFollowed { COLOR: red; TEXT-DECORATION: underline } P.MsoPlainText { FONT-SIZE: 10pt; MARGIN: 0pt; FONT-FAMILY: "Courier New" } LI.MsoPlainText { FONT-SIZE: 10pt; MARGIN: 0pt; FONT-FAMILY: "Courier New" } DIV.MsoPlainText { FONT-SIZE: 10pt; MARGIN: 0pt; FONT-FAMILY: "Courier New" } PRE { FONT-SIZE: 10pt; MARGIN: 0pt; FONT-FAMILY: "Courier New" } SPAN.EmailStyle20 { COLOR: navy; FONT-FAMILY: Arial } DIV.Section1 { page: Section1 } Bob et all

I installed a digital Ampmeter, connected to a 50mV Shunt which is installed in the #6 cable which comes from the alternator (Subaru engine) to my Exp Bus board.
I assume that this ampmeter indicates the current being produced by the alternator, obviously with the engine running.
But, every time I run the engine (stil at my garage, not yet flying), the ampmeter indication runs very quickly from, let's say 13.7 down to 8.2, then up to 14,6, again down and again up, very quickly.
Why am I geting this kind of reading?
Anything wrong or it's just indicating what it shoud?

Carlos
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href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List

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trigo(at)mail.telepac.pt
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PostPosted: Fri Nov 24, 2006 4:20 pm    Post subject: Ampmeter reading Reply with quote
Since I only got 1 answer (thanks Tim), here it goes again:


Bob et all

I installed a digital Ampmeter, connected to a 50mV Shunt which is installed in the #6 cable which comes from the alternator (Subaru engine) to my Exp Bus board.
I assume that this ampmeter indicates the current being produced by the alternator, obviously with the engine running.
But, every time I run the engine (stil at my garage, not yet flying), the ampmeter indication runs very quickly from, let's say 13.7 down to 8.2, then up to 14,6, again down and again up, very quickly.
Why am I geting this kind of reading?
Anything wrong or it's just indicating what it shoud?

Carlos
[quote][b]

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klehman(at)albedo.net
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PostPosted: Fri Nov 24, 2006 5:23 pm    Post subject: Ampmeter reading Reply with quote
Carlos
I don't think there are many Exp bus user's here but I would consider
this abnormal unless you have a flashing beacon or something that is
intermittantly drawing current. Does the voltage fluctuate? My hall
current sensor is quite steady on my EIS monitor with my Subaru. I do
have strobes. The current pulses to the injectors and ignition do vary
by several amps but that happens much too quickly for current sensors or
voltmeters to register anything other than a steady average current.
Ammeters just aren't fast enough to register those pulses. There are
some posts in the archives about fluctuating ammeters that might assist you.
Ken

Carlos Trigo wrote:

Quote:
Since I only got 1 answer (thanks Tim), here it goes again:

Bob et all

I installed a digital Ampmeter, connected to a 50mV Shunt which is
installed in the #6 cable which comes from the alternator (Subaru
engine) to my Exp Bus board.
I assume that this ampmeter indicates the current being produced by
the alternator, obviously with the engine running.
But, every time I run the engine (stil at my garage, not yet flying),
the ampmeter indication runs very quickly from, let's say 13.7 down to
8.2, then up to 14,6, again down and again up, very quickly.
Why am I geting this kind of reading?
Anything wrong or it's just indicating what it shoud?

Carlos


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Dale Ensing



Joined: 11 Jan 2006
Posts: 571
Location: Aero Plantation Weddington NC
PostPosted: Sat Nov 25, 2006 3:08 pm    Post subject: Ampmeter reading Reply with quote
Carlos,
Only similarity to my system is the EXP bus and the location of the sensor in the line, so therefore not much to go on, but mine does not show any fluctuation as you describe.
You do not indicate any load on the EXP bus when you are running the engine. Try putting about a 10 amp load on the system and let us know results.
Dale Ensing
do not archive
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Dale Ensing
RV-6A
Aero Plantation
Weddington NC
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trigo(at)mail.telepac.pt
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PostPosted: Sun Nov 26, 2006 1:08 pm    Post subject: Ampmeter reading Reply with quote
Dale

Thanks for the tip. I'll try your suggestion and report back.

Carlos
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