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nuckolls.bob(at)aeroelect
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 Posted: Mon Oct 15, 2012 1:00 pm Post subject: Course deviation electrical specification |
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At 04:12 AM 10/15/2012, you wrote:
| Quote: | Hi
Can anyone let me know where to find the electrical specification
for the deviation signal pair to a CDI indicator as the KI206.
I know the deviation is:
Input impedance: 1K ohms
Deflection sensitivity: 150mV for full scale deflection.
What I can't find is any specification for the limits on the common
mode voltage of the CDI pair.
Obviously the the deviation can go negative or positive driven by
the +/-150mV pair of wires. I assume that these sit somewhere above
aircraft ground and are not isolated but I can't find any details
Any help appreciated
Thanks
Peter
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The CDI needle is a meter movement and does
not operate 'against ground' . . . it floats.
So common mode is limited by the insulation
resistance of the internal conductors. It's
probably much higher than your proposed application
could produce.
Bob . . .
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pmather
Joined: 17 Sep 2009
Posts: 33
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| Posted: Mon Oct 15, 2012 2:52 pm Post subject: Course deviation electrical specification |
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Bob
That is true of a conventional CDI, but not of something like the Sandel.
This has to process the input pair electronically. I've managed to establish
that the GNS430 uses a fixed 2.5V above ground for the CDI - and the KNS80
uses 4.5V. I'm building an experimental autopilot so I need to know if 4.5V
is as high as it goes or if there is some definition of the actual standard
that needs adhering to.
Any further info appreciated
rgds
Peter
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enginerdy(at)gmail.com
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| Posted: Mon Oct 15, 2012 6:44 pm Post subject: Course deviation electrical specification |
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A common practice for CAN bus systems is to use a part that is tolerant of the system bus voltage on the signal lines.
That's just a datapoint for you though, not a real answer.
Daniel Hooper
On Oct 15, 2012, at 5:51 PM, "Peter Mather" <peter(at)mather.com> wrote:
[quote]
Bob
That is true of a conventional CDI, but not of something like the Sandel.
This has to process the input pair electronically. I've managed to establish
that the GNS430 uses a fixed 2.5V above ground for the CDI - and the KNS80
uses 4.5V. I'm building an experimental autopilot so I need to know if 4.5V
is as high as it goes or if there is some definition of the actual standard
that needs adhering to.
Any further info appreciated
rgds
Peter
--
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