aRotax 914?
Message text written by Graham Singleton
>In my experience this often fails to work reliably, because the switching
resistance varies more than the voltages of the EGT probes. IMHO the only
way is 4 probes and 4 displays, bar graphs ideally for me, but digital is
better than nothing. We had a switched system on a couple of Long EZs.
Neither were much use after a short time in service.
<
Was the switched system using a digital or anologue gauge? Analogue gauges
have a lower resistance and therefore load the output so that switch
contact resistance becomes more significant. A digital indicator should
have an input impedance of several megohms which should make any contact
resistance negligable by comparison.
Nigel Charles
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