nuckolls.bob(at)aeroelect
Guest
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 Posted: Tue Oct 13, 2015 8:46 am Post subject: Technique for DSub Pin / data breakout for RPM issue |
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At 10:01 AM 10/13/2015, you wrote:
| Quote: | --> AeroElectric-List message posted by: "plevyakh" <hplevyak(at)mac.com>
Folks,
I've come across this a few times in the System Test and Flight test of my GlaStar. Can you please share a technique you've used to break into a DSub connector pin and read the data going through that Pin/Wire? |
here is a cheep/n/dirty that I've used many times
using a short chunk of ribbon cable and the appropriate
connectors. Of course, this is for signal/low-power
levels only. Limit this technique to wire currents
of 1A or less.
[img]cid:.0[/img]
More robust techniques call for a specialized
break-out fixture not unlike this
[img]cid:.1[/img]
Here's a breakout box I built in a few hours to explore
signals in a starter-generator controller. Your tool would,
of course, be fitted with d-subs.
[img]cid:.2[/img]
Here's a specific application example for examining data at
altitude and 'from a distance'.
Connectors on the left tied into a system back in the hell-hole
of a Beechjet. The ribbon cable was routed through the gasket
on the baggage compartment door, taped to the side of the
fuselage and brought into the cabin through the passenger
entry door gasket. I sat in pressurized comfort watching
for an intermittent that had plagued the airplane for months.
It only occurred at altitude. Spotted the problem in the
DAS data which led to discovery of a pushed back pin in
a connector on the pressure bulkhead.
Your task DOES have a practical solution that lies somewhere
between the cheap-n-dirty to the high-altitude remote explorations
cited. But you will have to build something.
Bob . . .
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