Today's Message Index:
----------------------
0. 12:05 AM - Please Make A Contribution... (Matt Dralle)
1. 07:56 AM - Need a tips how best to validate wiring harness work (Howard M. Plevyak Jr.)
2. 07:50 PM - Re: Need a tips how best to validate wiring harness work (Robert L. Nuckolls, III)
3. 08:43 PM - Re: Need a tips how best to validate wiring harness work (David E. Nelson)
Message 0
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Please Make A Contribution... |
Dear Listers,
A quick reminder that November is the annual List Fund Raiser. The Matronics Lists
are 100% member supported and all of the operational costs are provided for
my your Contributions during this time of the year.
Your personal Contribution makes a big difference and keeps all of the Matronics
Email Lists and Forums completely ad-free.
Please make your Contribution today to keep these services up and running!
http://www.matronics.com/contribution
Thank you in advance!
Matt Dralle
Matronics Email List and Forum Administrator
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Need a tips how best to validate wiring harness work |
Hi Folks,
I'm a first time airplane builder and working on a GlaStar. I'm at the point of
instrument panel and electrical system installation. I'm planning around the
Z13/8 architecture and working thru the one system per page designs.
I had an avionics shop wire up some of the panel wiring harness for a number of
instruments (GNS430W, GRT EFIS, SL30, Trig Transponder TT22/TC20, and PS8000BT
audio panel).
My newbie question is around how best to validate the wiring work. I have a multimeter
tester and started to do continuity checks on all the D-Sub pin assignments....then
I thought I'd ask here what's best/disciplined practice to use
when checking out a pre-wired harness? Is there a D-Sub pin test lead tool that
make it easier / faster to check each pin assignment?
I've setup a spreadsheet to capture all the connector type, pin numbers, use /
function, FROM/TO information that I will then use to feed my schematic diagrams
later.
Thanks for any tips!
Howard Plevyak
Cincinnati, Ohio
Glastar
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Need a tips how best to validate wiring harness |
work
At 08:39 AM 11/13/2010, you wrote:
My newbie question is around how best to validate the wiring
work. I have a multimeter tester and started to do continuity
checks on all the D-Sub pin assignments....then I thought I'd ask
here what's best/disciplined practice to use when checking out a
pre-wired harness? Is there a D-Sub pin test lead tool that make it
easier / faster to check each pin assignment?
I've setup a spreadsheet to capture all the connector type, pin
numbers, use / function, FROM/TO information that I will then use to
feed my schematic diagrams later.
Thanks for any tips!
When you do a LOT of harness building and/or troubleshooting,
it's often useful to have a collection of test fixtures that
give you ready access to the wires in a harness to either
check for continuity (correctness) or to sample signals
that run on the wires. I own several dozen such fixtures
that were acquired over several decades of such activity.
Most look like this . . .
Emacs!
Others are more specialized . . .
Emacs!
In every case, the time and expense of fabricating the
tool was more than offset by expediting return to
service on multi-$millions$ airplanes.
Unless you can borrow the tools that mate with
the connectors specific to your project, it's a
certainty that fabricating them for a one-time
task will not offer a return on investment.
Most of my harness ring-out ventures was accomplished
with the aid of an individual who took one probe of
the "buzz box" and ran around to the various far
end connectors as I probed another connector while
calling out far ends by referring to the wiring
diagram. If your harnesses were professionally
built, they should have done this job already.
But it's a lot easier to find errors before the
harnesses are installed in the airplane than
after . . . and there's no really 'easy' way
to do it other than two-pins-and-one-wire-at-
a-time.
Bob . . .
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Need a tips how best to validate wiring harness |
work
Hi Howard,
My avionics harness was professionally built. I still did the pin-x should
connect to pin-y and built up a schematic using the collected data. I'm glad I
did as they built the harness a little differently than what the EFIS vendor
showed in their diagrams. Still workable, just different. Anyways, I think
this potentially saved hours of debugging should the equipment have been plugged
in and not worked correctly.
Also, for my sanity and ease of counting, I wrote the pin numbers on the front
of every DB style connector. This includes the connectors for the 430, SL-40,
etc. On any DB style connector that I assembled, I also wrote the pin numbers
on the back. Note that I didn't write every number down, I just wrote the
numbers that represented the outboard pins. Reference the top/right picture of:
http://caura.dyndns.org/gallery/Panel/acr?full=1 (sorry - large image)
When all the avionics wiring was in-place in the panel, my Wife and I spent
about 30 mins confirming the schematic to "as built" and updating as necessary.
I'm relatively confident that the avionics will work when inserted and
configured. If things don't work, I'm confident that the schematic is accurate
and will lead to a prompt resolution.
Overall, given your situation, I think you're on the right track.
Good luck,
/\/elson
~~ Lately my memory seems to be like a steel trap .... without any spring. ~~
On Sat, 13 Nov 2010, Howard M. Plevyak Jr. wrote:
> Hi Folks,I'm a first time airplane builder and working on a GlaStar. I'm at
> the point of instrument panel and electrical system installation. I'm
> planning around the Z13/8 architecture and working thru the one system per
> page designs.
>
> I had an avionics shop wire up some of the panel wiring harness for a number
> of instruments (GNS430W, GRT EFIS, SL30, Trig Transponder TT22/TC20, and
> PS8000BT audio panel).
>
> My newbie question is around how best to validate the wiring work. I have
> a multimeter tester and started to do continuity checks on all the D-Sub pin
> assignments....then I thought I'd ask here what's best/disciplined practice
> to use when checking out a pre-wired harness? Is there a D-Sub pin test
> lead tool that make it easier / faster to check each pin assignment?
>
> I've setup a spreadsheet to capture all the connector type, pin numbers, use
> / function, FROM/TO information that I will then use to feed my schematic
> diagrams later.
>
> Thanks for any tips!
>
> Howard Plevyak
> Cincinnati, Ohio
> Glastar
>
>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|