Today's Message Index:
----------------------
1. 06:43 AM - Getting the numbers . . . (Robert L. Nuckolls, III)
2. 07:57 AM - Re: Getting the numbers . . . (DeWitt Whittington)
3. 08:43 AM - Re: Getting the numbers . . . (Robert L. Nuckolls, III)
4. 08:45 AM - Re: Getting the numbers . . . (Robert L. Nuckolls, III)
5. 11:15 AM - Re: AeroElectric-List Digest: 8 Msgs - 02/15/14 (D L Josephson)
6. 08:17 PM - Re: Fat wires and plumber's solder (John Evens)
Message 1
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| Subject: | Getting the numbers . . . |
We have long and often lamented a lack of
good data to assist in the resolution of certain
performance issues on the AeroElectric-List over the years.
A few weeks ago I ordered some USB based,
analog and digital data acquisition modules off
eBay.
http://tinyurl.com/m68rbdl
Emacs!
Received them yesterday. I downloaded the
companion software and did a quick look-see
at the graphical user interface and confirmed
that the hardware were all talking to each
other.
This is a real bargain . . . not so much for
the DAS module . . . that's easy to duplicate.
The GUI and the data management is a very
non-trivial task and at first blush, these folks
have done a good job.
The eBay listing says 'limited quantities remaining'
after having sold 438 of the things. My guess is that
they're working down a batch of 500.
But even if they run out of hardware, ALL the software
for both the USB DAS module and the GUI is down-loadable
and can be used with your own incarnation of a
USB DAS module.
I've got a lap-top that will become part of a
system I can mail out to AeroElectric-List readers who are willing
to hook it to their airplanes and record some data.
I've mounted the bare-foot module on a prototype
board so I can add an instrumentation amplifier
to the assembly for the purpose of measuring millivolt
shut levels.
This is moving forward nicely but if anyone on
the List even thinks they'd like to possess such
capabilities, they might want to pick up one or
two of the USB-DAS modules.
If this experiment produces pleasing results, it
may become the topic for a Kitplanes article.
Bob . . .
Message 2
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| Subject: | Re: Getting the numbers . . . |
Bob,
Just noticed this posting. Would this module and the software be useful for
our Egg Subaru 3.6L engine with EGT probes added? Or is it just for
Lycoming and Continentals? We also have a Vertical Power VP-200 and, of
course, the GRT EIS engine monitor with the ability to record to a memory
stick.
Dee
DeWitt (Dee) Whittington
Richmond, VA
804-677-4849 iPhone
804-358-4333 Home
On Sun, Feb 16, 2014 at 9:42 AM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> We have long and often lamented a lack of
> good data to assist in the resolution of certain
> performance issues on the AeroElectric-List over the years.
>
> A few weeks ago I ordered some USB based,
> analog and digital data acquisition modules off
> eBay.
>
> http://tinyurl.com/m68rbdl
>
> [image: Emacs!]
>
> Received them yesterday. I downloaded the
> companion software and did a quick look-see
> at the graphical user interface and confirmed
> that the hardware were all talking to each
> other.
>
> This is a real bargain . . . not so much for
> the DAS module . . . that's easy to duplicate.
> The GUI and the data management is a very
> non-trivial task and at first blush, these folks
> have done a good job.
>
> The eBay listing says 'limited quantities remaining'
> after having sold 438 of the things. My guess is that
> they're working down a batch of 500.
>
> But even if they run out of hardware, ALL the software
> for both the USB DAS module and the GUI is down-loadable
> and can be used with your own incarnation of a
> USB DAS module.
>
> I've got a lap-top that will become part of a
> system I can mail out to AeroElectric-List readers who are willing
> to hook it to their airplanes and record some data.
>
> I've mounted the bare-foot module on a prototype
> board so I can add an instrumentation amplifier
> to the assembly for the purpose of measuring millivolt
> shut levels.
>
> This is moving forward nicely but if anyone on
> the List even thinks they'd like to possess such
> capabilities, they might want to pick up one or
> two of the USB-DAS modules.
>
> If this experiment produces pleasing results, it
> may become the topic for a Kitplanes article.
>
>
> Bob . . .
>
Message 3
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| Subject: | Re: Getting the numbers . . . |
At 09:56 AM 2/16/2014, you wrote:
>Bob,
>
>Just noticed this posting. Would this module and the software be
>useful for our Egg Subaru 3.6L engine with EGT probes added? Or is
>it just for Lycoming and Continentals? We also have a Vertical
>Power VP-200 and, of course, the GRT EIS engine monitor with the
>ability to record to a memory stick.
>
>Dee
This is a stand-alone measurement and recording system.
You might call the USB-DAS module a 5 channel voltmeter
with an input of 0-5v for each channel.
In the investigation of strobe system current profiles
I need to add a shunt to measure current (50 millivolt
drop at 20A), an instrumentation amplifier with a gain
of 100 to boost that 50mV to 5.0v, and an 3:1 attenuator
to drop the 14v bus down to 14/3 to attache to one of
the 5v voltage inputs.
The combination of USB-DAS, laptop and the right
cables, we attach it to the system to be explored . . .
in this case, the strobes that seem to be really
hard on wiring. Turn the strobe on and then get
a few seconds of data. We'll want to get data from
a number of systems . . . both problem and civil
children.
The DYNAMIC voltage-current profiles will, I
hypothesize, give us some insight as to why the problem
children are so hard on switches and other wiring.
If you wanted to use it to gather engine data,
you'd have to craft the same sort of interface between
data points to be recorded and the USB-DAS.
Look at this device as if it were a really dumb
voltmeter with the ability to gather 1000 samples
per second on fast moving data and plot it on a
graph.
Bob . . .
Message 4
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| Subject: | Re: Getting the numbers . . . |
At 09:56 AM 2/16/2014, you wrote:
>Bob,
>
>Just noticed this posting. Would this module and the software be useful
Oops . . . didn't finish. Don't know about the
software. The software OUTPUTS excel or column
delimited text files for the data and will display
the data it gathers on a oscilloscope-like plot.
I don't know yet if it will suck in data
from other sources for graphical observation.
Bob . . .
Message 5
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| Subject: | Re: AeroElectric-List Digest: 8 Msgs - 02/15/14 |
On 2/15/14 11:58 PM, AeroElectric-List Digest Server wrote:
> Question: If one were to use plumbers solder and plumbers flux on a
> joint and thouroughly cleaned it with acetone or lacquor thinner,
> would this be acceptable? I am just not aware of the chemistry
> involved, or if anyone has done any experimentation with this process.
> My sense is that the chemistry that promotes
> corrosion in the "perfect joint" is all on
> the outside and easily neutralized and/or
> cleaned. The biggest risk to joint longevity
> probably has more to do with alloy than with
> removal of residual flux.
The problem is that people don't sufficiently neutralize and/or clean
(how would they have known to test that they did?) and stray bits of
flux remain on surfaces that are not protected by solder. Acetone or
hydrocarbon solvents don't help, use water. Alkaline mineral water helps
get to the point where you can't detect any acid on the surface (battery
terminal cleaner spray with phenolphthalein indicator.) A failure mode
I've seen is on copper terminal lugs where the flux has penetrated into
small gaps between clamped surfaces and continues to attack the metal
from there, very similar to what happens when battery acid gets between
a terminal lug and the terminal. Rosin "electrical" flux is only really
active when it's hot; acid "plumbers" flux (primarily hydrochloric acid
or some metal chloride) continues to work when cold. The alloy doesn't
really matter, in my experience, so long as the joint cooled without
movement.
Message 6
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| Subject: | Re: Fat wires and plumber's solder |
I believe that one thing to keep in mind is that if the solder you're
using is truly 95-5 alloy, it is not advisable to use it with brass.
There is a chemical reaction in the presence of moisture that causes
long-term porosity & pitting of the joint. I'm not sure, but that may
be due to the antimony reacting with something in the brass.
How about the "high-tech" silver-bearing electrical solder, available
from Radio Shack? I've been using it for a few years, believing it to
be superior to the 60-40 standard. I'm sure many of us have seen older
radios or other electronic equipment that suffered multiple
deteriorated solder joints. I had a nice S.A.E. amp at one time that I
had to re-solder just about all of the capacitor leads after it
started having "issues". I'm not sure why that happened, and it
probably had more to do with the soldering technique used in
manufacture rather than the solder itself. That probably doesn't have
much to do with the current discussion, but I wonder if the
"high-tech" stuff might ultimately be more stable.
John
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