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nuckolls.bob(at)aeroelect
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 Posted: Tue Mar 23, 2010 5:09 am Post subject: Getting the numbers |
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At 05:38 PM 3/22/2010, you wrote:
--> AeroElectric-List message posted by: Kevin Boddicker <trumanst(at)neitel.net>
Thanks for the offer. I have two.
Good for you. Over the course of several seminars
my opening presentation was on DC power and the value
of knowing the numbers, I would query the class as
to how many folks did not possess at least one multi-meter
of reasonable accuracy (handy little analog
testers need not apply). Generally there were three
or four who would raise their hands.
I immediately handed out meters from Harbor Freight.
The cost was trivial and it helped me emphasize
very early in the class that having some grasp
on the "size of things" was pretty important to
successful implementation of recipes for success.
I will try to get some data on my next airport visit.
I will record some numbers and get back to you. Is there anything I should be aware of,or a certain protocol, before proceeding?
Not a critical one . . . it's time consuming
to sit and watch the setup for the purpose
of plotting performance. Data points acquired are
pretty coarse. Just see what the "float" voltage
is after a couple of days. Then turn something on
to put drag a couple a.h. of energy out of the
battery. Hook the 1562 up and see if you can
catch a top-off voltage along with some sense
of time that it stays in the top-off mode.
Speaking of data acquisition systems. There are
dozens of new players in the data logging business.
[img]cid:.0[/img]
This USB interface voltage logger can be reviewed
at:
http://www.microdaq.com/lascar/usb/el-usb-3.php
It has 0-30 volt input range, sample rates from
1 sec to 12 hours and a 1% overall accuracy.
I suspect it's resolution is much better than
1% and may be as great at 0.1% of full scale
(10 bits) so for more exacting work, one might
be able to characterize a given instrument for
better performance in analysis of the data.
At $75 its a pretty good value. Folks with a
curiosity about such things are encouraged
to investigate this market for themselves.
I've got several good tools for doing this task
but none that are so handy as this . . . I'll
probably decide that I just have to get one
pretty soon.
By the way, if any of you own one of those
West Mountain Radio battery analyzers
http://www.westmountainradio.com/CBA.htm
They can be pressed into service as a
useful data logger/plotter. This curve
was gathered with just such a device.
http://www.aeroelectric.com/Pictures/Curves/Battery_Tender_Recharge.pdf
You set the thing up to "test" a battery
with say a 10 milliampere "load" and
set the end-of-test voltage very low. You
have to fool it into thinking that you're
testing a real 7 or perhaps 8-cell battery
to get the upper end of the voltage plot
where you need it. Then hook it across the
system being monitored. It will dutifully
gather voltage data for days if needs be
and produce nice plots too at no extra charge.
Of course, this ties up a PC for the
duration of the test. I keep a number of
junker 'putes around for just this kind
of task.
Bob . . .
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trumanst(at)neitel.net
Guest
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| Posted: Wed Mar 24, 2010 4:57 am Post subject: Getting the numbers |
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Thanks Bob. I will report back.Kevin
On Mar 23, 2010, at 8:07 AM, Robert L. Nuckolls, III wrote:
[quote] At 05:38 PM 3/22/2010, you wrote:
--> AeroElectric-List message posted by: Kevin Boddicker <trumanst(at)neitel.net (trumanst(at)neitel.net)>
Thanks for the offer. I have two.
Good for you. Over the course of several seminars
my opening presentation was on DC power and the value
of knowing the numbers, I would query the class as
to how many folks did not possess at least one multi-meter
of reasonable accuracy (handy little analog
testers need not apply). Generally there were three
or four who would raise their hands.
I immediately handed out meters from Harbor Freight.
The cost was trivial and it helped me emphasize
very early in the class that having some grasp
on the "size of things" was pretty important to
successful implementation of recipes for success.
I will try to get some data on my next airport visit.
I will record some numbers and get back to you. Is there anything I should be aware of,or a certain protocol, before proceeding?
Not a critical one . . . it's time consuming
to sit and watch the setup for the purpose
of plotting performance. Data points acquired are
pretty coarse. Just see what the "float" voltage
is after a couple of days. Then turn something on
to put drag a couple a.h. of energy out of the
battery. Hook the 1562 up and see if you can
catch a top-off voltage along with some sense
of time that it stays in the top-off mode.
Speaking of data acquisition systems. There are
dozens of new players in the data logging business.
<2769199.jpg>
This USB interface voltage logger can be reviewed
at:
http://www.microdaq.com/lascar/usb/el-usb-3.php
It has 0-30 volt input range, sample rates from
1 sec to 12 hours and a 1% overall accuracy.
I suspect it's resolution is much better than
1% and may be as great at 0.1% of full scale
(10 bits) so for more exacting work, one might
be able to characterize a given instrument for
better performance in analysis of the data.
At $75 its a pretty good value. Folks with a
curiosity about such things are encouraged
to investigate this market for themselves.
I've got several good tools for doing this task
but none that are so handy as this . . . I'll
probably decide that I just have to get one
pretty soon.
By the way, if any of you own one of those
West Mountain Radio battery analyzers
http://www.westmountainradio.com/CBA.htm
They can be pressed into service as a
useful data logger/plotter. This curve
was gathered with just such a device.
http://www.aeroelectric.com/Pictures/Curves/Battery_Tender_Recharge.pdf
You set the thing up to "test" a battery
with say a 10 milliampere "load" and
set the end-of-test voltage very low. You
have to fool it into thinking that you're
testing a real 7 or perhaps 8-cell battery
to get the upper end of the voltage plot
where you need it. Then hook it across the
system being monitored. It will dutifully
gather voltage data for days if needs be
and produce nice plots too at no extra charge.
Of course, this ties up a PC for the
duration of the test. I keep a number of
junker 'putes around for just this kind
of task.
Bob . . .
[b]
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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