Mon Oct 28 10:35:53 1996 - Message No. 125
From: Michael Dipper

Subject: Re: Tripmaster Top Speed


Hi,

Achim Muehlberger wrote:

> A really interesting problem, but I haven't figured out why the 
> tripmaster is running faster when the cable gets loose - even if the
> clock is running normal.
> A possibility could be that the sensor in the speedometer measures
> against plus, and because of that the tripmaster thinks of faster > driving.

Solution is simple:

While the clock has got itīs own quarz-stabilized time base and runs as
long as the power climbs over a certain level, the speed information
comes in "pulses" form a sensor at the tachometer cable.

There is an inductive coupling installed which gives every turn one
electrical impulse. The higher the speed, the more impulses/sec are
produced. Now, if the battery cable gets loose, the contact isnīt lost
completely but through the vibrations of driving there a lot of peaks in
the power supply produced. Due to bad filtering these ultra quick
impulses reach the counter of the tripmaster and you have your "flying"
Africa Twin (or sheep, Joerg ?   :-)  )

Greets,

--- Micha ---

-- 
/------------------------------------------------------------\
|  Michael Dipper  -  Ludwigsburg, Germany                   |   
|  Email:  dipper@isd.uni-stuttgart.de                       |
|  WWW:    http://www-normans.isd.uni-stuttgart.de/~dipper/  | 
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