Today's Message Index:
----------------------
1. 06:54 AM - Re: Report on New Power Supply (Robert L. Nuckolls, III)
2. 07:09 AM - Re: building a batter capacity tester (Robert L. Nuckolls, III)
3. 08:56 AM - Taming the wiley coax . . . (Robert L. Nuckolls, III)
4. 02:52 PM - Something Special For You (Marty Mason)
5. 04:09 PM - one sensor, two gages? (Chris Barber)
6. 04:53 PM - Re: one sensor, two gages? (Nati Niv)
7. 07:57 PM - Re: one sensor, two gages? (Chris Barber)
8. 08:35 PM - Re: one sensor, two gages? (Richard E. Tasker)
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: | Re: Report on New Power Supply |
At 06:49 PM 9/14/2011, you wrote:
Hi Bob,
Several months ago I too purchased one of these units (or similar) as
it seemed like a great method to power up the panel when working on
the electrical problems, changes, etc. Rated at 13.5 v., 350W, the
first unit I received (they come from China) would not hold voltage
when loaded with about 5-6 amps of panel load. It started at about
13.4 v. and dropped to 12.4 when the panel was powered up. I
contacted the seller and he said to return it and he would replace it.
I did and about 4 wks later he sent me a replacement. It is
functioning in a similar fashion. No load about 13.4 and mild load
drops to 12.75. Still Ok for panel work, etc., but, I believe the
spec indicate that it should be holding a tighter regulation.
Any thoughts on what maybe going on...?
You got me my friend. I've had first-hand contact with
four power supplies from the source I linked. Two are
already out the door, two more are waiting installation in a
project. I just went to the bench and hooked up one
out of the box. It was set for 13.5 zero load. Put
a 1.0 ohm resistor across it (13.5A) and got maybe
0.05 volts drop.
David
PS: ...voltage measurement being done with a cheap digital DVM and I
do not know if the switching power supply would cause errors that I
have not considered.....
I wouldn't think so . . . but there IS a reason for
what you have observed. The mission is to figure out
what it is. Cross checking with another instrument
is a good first step.
Forgive the potential for insult by asking whether you've
accounted for wire drops? The test I just made measured
voltage right at the V+ and V- terminals on the supply.
The 1 ohm resistor was connected to adjacent V+ and
V- terminals.
A tech at HBC built what he thought was a handy
load tester where his power resistor was in a nice
box that plugged onto the front of his multimeter.
The test leads plugged into the front of his load
box. Of course, the meter was making measurements
a the ends of test leads while loaded with significant
current.
Like the 4-wire low-ohms adapter, an accurate
high-loads adapter begs for the same 4-wire
measurement where the instrument and load paths
are not shared. We modified his box to add separate
banana jacks for load and measurement and subsequent
measurements were much more meaningful.
Bob . . .
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: building a batter capacity tester |
From: MLWynn@aol.com
Subject: Re: AeroElectric-List: building a batter capacity tester
Hey Bob,
I was looking over the specs on the West Mountain battery analyzer
you mentioned:
http://www.westmountainradio.com/product_info.php?products_id=cba3&navcode=/cbaLink1
This is a very elegant piece of equipment. The information that it
provides is certainly several magnitudes of more exact than the poor
man's bench tester I was thinking to build. Further, it seems like
something that my EAA chapter could put to more regular use than I
would on my own. It is more than it would cost me to build the
other, but not ridiculously expensive. Thank you for the direction.
Yeah, those are a really good value. I have two
of them. I wish they were a little more robust . . .
say good for 10+ amps while testing a 12v battery
but I HAVE used them to gather a lot of good data.
It was a couple of years into my ownership that it
suddenly occurred to me that they could be used for
long term voltage monitoring and plotting.
Set it up to 'test' a battery with a 0.01 amp
load and a very low 'cutoff voltage' then hook
the test leads to the source being monitored.
With this piece of equipment, would there be any reason to also have
a carbon pile load tester? Harbor Freight has one on sale for
$49.95. It seems to me that I would get much more useful data from
the West Mountain unit and could save on that expense.
BOTH devices are useful for different reasons. But
they can be used together too.
LOAD testing is measure of a battery's internal
impedance . . . I.e. ability to carry a large load.
CAP testing is a measure of available energy at
the terminals under various loads . . . where
we know that useful energy is adversely influenced
by internal impedance. There's more than enough
ENERGY in a couple of alkaline lantern batteries
to start an engine and the West Mountain Radio
device would confirm that assertion. Problem is
that a string of "F-cells" wont dump that energy
at 200+ amps.
Your load tester can be used to check your car's
alternator too. Hook a voltmeter to the alternator's
b-lead terminal while putting a load on the battery
equal to the alternator's rated output with the engine
rpms above 2000 or so. The drop should be nominal . . .
perhaps 0.5 volts max. It might even go UP a bit!
The WMR cap tester will characterize your battery's
ability to support endurance loads for an interval
set my your design goals. The load tester cannot
measure or even help predict that.
I considered doing a kit product consisting of a
USB linked micro-controller and a really FAT mos-fet
but with no heat-sink. Modern computers have a really
great CPU heatsink and fan assembly that one can acquire
from dead computers. A bill of materials for the
hardware is about $15.00.
The hardware is simple . . . the software for
a graphical user interface and data plotting
is a significant task that I just don't have
time to address. If anyone out there is really
whippy in Visual C or some similarly capable
language, we might consider a joint venture
to offer a kit for a DIY cap meter with some
really nice features.
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: | Taming the wiley coax . . . |
A few weeks ago we were talking about getting a hand-held
transceiver connected to the ship's external antenna.
Modern coax like RG141 is pretty stiff . . . RG142 less
so but still . . .
When you extend the ship's coax directly to the hand-held,
the result can look like this . . .
http://www.aeroelectric.com/articles/Antennas/HandHeld-Ant1.jpg
When the radio mounts a 'rubber duck' antenna, it's
very much like a microphone. Sticking that coax directly
into the top-mounted BNC connector makes the radio
a bit awkward.
Consider this approach . . .
http://www.aeroelectric.com/articles/Antennas/HandHeld-Ant2.jpg
A couple of right angle adapters and a rubber band
will route the coax down tight against the back of
the radio.
Bob . . .
Message 4
| 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: | Something Special For You |
I'm finally sending you a link http://www.attic-space-laredo.1stamericanstorage.com/info.html Sorry for taking so long
Message 5
| 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: | one sensor, two gages? |
I regret my lack of knowledge, but could someone enlighten me, in a very la
yman's manner, why you could not hook up a sensor to provide readings to tw
o instruments. No, I am not planning to do it as it is my understanding it
does not work, but what is the reason it does not work. Is it that too li
ttle power is generated to signal two gages, does one interfere with the ot
her. It would seem that the same data would be sent, such as if two people
are looking at the same color and both seeing it as red and then saying it
is red. I have been curious about this for a while and as I wait for my n
ew Dynon engine monitor to supplement my rotary RWS engine monitor I though
t I would ask. Thanks.
Chris Barber
Houston
EFD - Ellington Airport
Velocity N17010
Turbo Rotary 13b
Z-14
Message 6
| 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: one sensor, two gages? |
Chris
To start answering your question it would be interesting to know what gauge
you are referring to because the answer will differ from one gauge to the
other. For some you can actually monitor the same signal with two gauges
(some RPM gouges are just good example)
What exact type of gauge you are referring to?
Nati
Champaign, IL
On Thu, Sep 15, 2011 at 6:04 PM, Chris Barber <cbarber@texasattorney.net>wrote:
> I regret my lack of knowledge, but could someone enlighten me, in a
> very layman's manner, why you could not hook up a sensor to provide
> readings to two instruments. No, I am not planning to do it as it is my
> understanding it does not work, but what is the reason it does not work. Is
> it that too little power is generated to signal two gages, does
> one interfere with the other. It would seem that the same data would be
> sent, such as if two people are looking at the same color and both seeing it
> as red and then saying it is red. I have been curious about this for a
> while and as I wait for my new Dynon engine monitor to supplement my
> rotary RWS engine monitor I thought I would ask. Thanks.
>
>
> Chris Barber
>
> Houston
>
> EFD - Ellington Airport
>
> Velocity N17010
>
> Turbo Rotary 13b
>
> Z-14
>
> *
>
> *
>
>
Message 7
| 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: | one sensor, two gages? |
Nati,
Not any one particular because I don't know that much about it except I hav
e been told that you just can't do it. I guess the ones I was most curious
about would be temps, ie oil and in my rotary, coolant and pressure, oil,
coolant and fuel. The one I have on there now are VDO that were provided b
y the engine monitor from RWS (Tracy Crooks aviation rotary business). I a
m not sure what will be provided with the Dynon, which should be in transit
as I type.
Thanks for the interest.
Chris
________________________________
From: owner-aeroelectric-list-server@matronics.com [owner-aeroelectric-list
-server@matronics.com] on behalf of Nati Niv [n992dn@gmail.com]
Sent: Thursday, September 15, 2011 6:50 PM
Subject: Re: AeroElectric-List: one sensor, two gages?
Chris
To start answering your question it would be interesting to know what gauge
you are referring to because the answer will differ from one gauge to the
other. For some you can actually monitor the same signal with two gauges (s
ome RPM gouges are just good example)
What exact type of gauge you are referring to?
Nati
Champaign, IL
On Thu, Sep 15, 2011 at 6:04 PM, Chris Barber <cbarber@texasattorney.net<ma
ilto:cbarber@texasattorney.net>> wrote:
I regret my lack of knowledge, but could someone enlighten me, in a very la
yman's manner, why you could not hook up a sensor to provide readings to tw
o instruments. No, I am not planning to do it as it is my understanding it
does not work, but what is the reason it does not work. Is it that too li
ttle power is generated to signal two gages, does one interfere with the ot
her. It would seem that the same data would be sent, such as if two people
are looking at the same color and both seeing it as red and then saying it
is red. I have been curious about this for a while and as I wait for my n
ew Dynon engine monitor to supplement my rotary RWS engine monitor I though
t I would ask. Thanks.
Chris Barber
Houston
EFD - Ellington Airport
Velocity N17010
Turbo Rotary 13b
Z-14
ist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
ttp://forums.matronics.com
_blank">http://www.matronics.com/contribution
Message 8
| 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: one sensor, two gages? |
Some you can easily, some you cannot (depends on the gauge and the monitors), some
you can do with a bit of finagling.
Let me know exactly what you will be using for the sensor and the two instruments
and I can give you suggestions.
I have a number of sensors that I share between my Blue Mountain EFISOne and a
Grand Rapids 4000. Most were pretty easy to share.
Dick Tasker
Chris Barber wrote:
>
> I regret my lack of knowledge, but could someone enlighten me, in a very layman's
manner, why you could not hook up a sensor to provide readings to two instruments.
No, I am not planning to do it
> as it is my understanding it does not work, but what is the reason it does not
work. Is it that too little power is generated to signal two gages, does one
interfere with the other. It would seem
> that the same data would be sent, such as if two people are looking at the same
color and both seeing it as red and then saying it is red. I have been curious
about this for a while and as I wait
> for my new Dynon engine monitor to supplement my rotary RWS engine monitor I
thought I would ask. Thanks.
>
> Chris Barber
>
> Houston
>
> EFD - Ellington Airport
>
> Velocity N17010
>
> Turbo Rotary 13b
>
> Z-14
>
> *
>
>
> *
--
Please Note:
No trees were destroyed in the sending of this message. We do concede, however,
that a significant number of electrons may have been temporarily inconvenienced.
--
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! --
|