Re: [DMCForum] DMCH new fuel sender
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Re: [DMCForum] DMCH new fuel sender



I took the sender apart again and held it to my ear while running the
float
up & down.  What I heard sounded like magnetic reed switches clicking
along
the way.  So I hooked it to an ohm meter to confirm my suspicion.  Sure
enough, the output stepped incrementally at a rather low resolution.  What
this means is that the output is (in a crude sense) digital.  By counting
the steps, I can see that at best the gauge can only show 1/8 step
increments.  The only thing to smooth out the readings is the sloshing
motion of the fuel in the tank and the slow response time of the dash
gauge.
It's cheap, but simple & durable.

I got the following readings: (in ohms)
4/4 - 92
7/8 - 90
3/4 - 58
5/8 - 52
1/2 - 47
3/8 - 42
1/4 - 25
0    -  0

>From these measurements it is apparent that the designer purposely fudged
the output to be weighted toward center scale.  Why would he do that?

Walt



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