t.au>
>I have a Rocky Mountains engine monitor and plan to set it up to monitor all
>four cht's and egt's. An electronics savvy friend of mine modified a video
>switching/sequencing kit which has 8 small relays so that I could take 8
>thermocouples and drive them through to the monitor and it would cycle
>through each one in turn (with adjustable delay set by a potentiometer).
>I'm just about to install it now. Would you anticipate any problems with
>this set-up?
Can't tell. I think there's a risk that it will not. Video is
generally carried on coaxial cable with all signals sharing
a common ground via chassis connections and shielding. Switching
in this product may well be carried out in manner I've depicted
in Figure 14-7A of the thermocouple article found at:
http://www.aeroelectric.com/articles/excerpt.pdf
For error free switching of thermocouples, you need two pole
switching with resonable care to to exactly the same thing to
both sides of the thermocouple path to avoid introduction
of un-compensated new thermocouples that cause error.
>Can I mount it above the radio stack or should I put it
>further away from the panel to avoid any noise getting into the audio
>system?
Thermocouple wiring carries no noise . . . it may be routed
with other wires and close to potential noise victims.
Bob . . .
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( The only time you don't fail is the last )
( time you try something, and it works. )
( One fails forward toward success. )
( C.F. Kettering )
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http://www.aeroelectric.com
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