david.nelson(at)pobox.com
Guest
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 Posted: Fri May 08, 2009 10:59 am Post subject: Radio Noise Problems - Rotax 914 Alternator Problems |
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Hi Darin,
While an o-scope would be preferable, many years ago I was told that I could use
a Volt-Ohm-Meter to do a quick check of a diode bridge for a running alternator
by measuring the AC voltage. I've never had the opportunity (knock on wood) to
verify this, however.
I think our basic alternator is essentially a 3 phase alternator. So if a diode
fails, I'd think the number would be in neighborhood of 12V/3phase = 4 VAC/phase
(there may be a small multiplier in there somewhere) rather in the sub 1 VAC
(ripple voltage).
I'm sure the Bob will chime in here somewhere and either validate or correct.
Either way, I'd like to update my notes.
Regards,
/\/elson
~~ Lately my memory seems to be like a steel trap .... without any spring. ~~
On Fri, 8 May 2009, darinh wrote:
| Quote: |
Joe,
Thanks for the reply. I don't have access to an oscilloscope but can measure
voltage using a meter on AC. What in particular would I be looking for when
comparing the AC vs. DC? I would expect to see around 14.0vdc but what am I
looking for with AC? Maybe a dumb question but I am dumb when it comes to
this stuff.
--------
Darin Hawkes
Series 7
914 Turbo
Kaysville, Utah
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 43151#243151
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