REFLECTOR: Odd fuel pressure Problem

[Scott Derrick]

Brian,

It is interesting as others have related that they too have experienced the 
problem but after running awhile with nary an alert?  I've not had an alert 
in 300+ hours?  Then  I get then every time I fly?  Possibly the sensor 
changing over time?

The snubber(restrictor) will reduce, change or possibly  eliminate the 
pulses from the pump and pulse/vibrations transmitted from the engine at 
large into the fuel system.

Scott

At 09:05 AM 11/27/2004, you wrote:
>This is a digital instrument.  It has a shortcoming that analog gauges do
>not have; it must sample the signal.  Scott, I'm sure you are aware of the
>Nyquist limit, but others here may not.  Basically Nyquist says that you
>must sample a signal at twice the highest possible frequency that may be
>present in the signal you are sampling.  This can be applied to noise (for
>aliasing), and for data resolution, like how many pixels does it take to
>resolve an object, or how high of a frequency is required to represent
>something.
>
>Anyway, the Vision Micro must sample the signal, and it should have a
>bandpass filter before the sampling circuit so that noise over a certain
>frequency can't be aliased onto the resulting data.
>If this is the problem, which doesn't sound like the case here, I would look
>at a couple of things.
>
>1) Does the Vision Micro sample the fuel pressure at some rate near engine
>RPM?  Does the fuel pump cause pressure pulses in this range?
>2) has something changed where the signal line now has spikes on it that
>possibly change with engine RPM?  This relates to the previous point.
>3) Has something damaged the bandpass filter?  This one is a bit of a reach.
>
>  Brian Michalk  <http://www.michalk.com>
>Life is what you make of it ... never wish you had done something.
>Aviator, experimental aircraft builder, motorcyclist, SCUBA diver
>musician, home-brewer, entrepreneur and barely single
>
>
>
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