Today's Message Index:
----------------------
1. 12:47 AM - Re: AeroElectric-List Digest: 12 Msgs - 06/14/12 (Franz Fux)
2. 07:41 AM - Re: G3X Garmin EFIS (Robert L. Nuckolls, III)
3. 10:41 AM - Re: Inexpensive CAD software (D L Josephson)
4. 10:49 AM - Re: SL-40 (Robert L. Nuckolls, III)
5. 11:44 AM - Re: Re: Inexpensive CAD software (John Loram)
6. 02:34 PM - Re: Re: Inexpensive CAD software (Henador Titzoff)
7. 05:22 PM - Re: Re: Inexpensive CAD software (Robert L. Nuckolls, III)
8. 06:54 PM - Re: G3X Garmin EFIS (fedico94@mchsi.com)
Message 1
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| Subject: | Re: AeroElectric-List Digest: 12 Msgs - 06/14/12 |
only intermittent access to e-mail until June 19th, in an urgent matter contact
info@lastfrontierheli.com
Message 2
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| Subject: | Re: G3X Garmin EFIS |
At 05:45 PM 6/14/2012, you wrote:
need advice
I want to test the hall effect sensor wire input to the G3X (Slick
Mag sensor from UMA). I have never gotten the rpm sensor to test as
one would a cam shaft hall effect sensor on a car with an analogue voltmeter.
Sensors that can be 'read' with an analog
voltmeter are generally variable reluctance
devices . . .
Magnetic sensors by CRA Division of Electro-Numerics
These have a permanent magnet center pole piece with
many turns of 'cat hair' wound around them. When the
teeth of a ferrous gear fly past the end of the pole
piece, the change in magnetic flux around the wires
generates a small, generally sinusoidal, ac waveform
with a frequency equal to teeth-per-second and an
amplitude proportional to teeth-per-second.
On the other hand, a 'hall effect device' for RPM
sensing generally depends on an external magnetic
field (like the one that spins around the shaft of
a magneto). It's usually a 3-wire device (ground,
signal and power) but CAN be a 2-wire device for
accommodating instruments. These need to be powered
up by 3-15 volts DC and the output signal is generally
a square wave, again frequency equal to pole passages
per second but an amplitude fixed to some value close
to the power supply voltage.
Emacs!
So if the sensor you're trying to test is indeed a Hall
Effect device, you'll need to wire it up to emulate the
power supply and signal loads present in normal operations.
Observation of a the output signal will require an
oscilloscope as opposed to a simple voltmeter.
According to Klaus Savier's instructions the input signal from his
device will record on the G3X
His signal from the Plasma II puts out a square wave (rather than
sine wave) at 10V amplitude and
0.3me ? width. 2 pulses per revolution so about so for 2k rpm need
4K pulses per min.
Is there a reasonably priced pulse generator that will send out a
signal like this or is there place to get it locally like radio shack ?
Sure, it's called a 555 timer.
The flap indicator does not work. it is dependent upon a slde
potentiometer from Ray Allen
Is there a way to build a device to send a signal down the input wire
to the G3X that varies voltage ? The G3X displays 0.3 V on the flap
panel but no chage as I run the flaps up and down. I assume the max
voltage going in is 0.3V. I thought of using a 9 V battery with a
potentiometer and this may be useful for the fuel senders as well.
That seems likely.
I have yet to test the fuel tank senders to see if they work. Very
disappointed that this professionally assembled suite of Garmin
equipment has some major problems in receiving a signal.
Hard to tell if it is the senders or the LSU computer brain. So far
the senders all check out as working properly. My main problem is
getting access to data to safely test the input signal wires for the
RPM sensor, but Klaus Savier has some information on his Plasma II
device for electronic signal to the input of the RPM of the
G3X. Prior to installation I use OHM meter to make sure the supplied
harneses had continuity and correct pin readout. So much for plug-n-play.
Garmin is pretty good at displaying the right
numbers representing various system values. The
problem is with the wide variety of sensor styles,
scale factors, offsets and wave shapes. Had Garmin
supplied all components they would have been married
in production. But as you've discovered, doing the
engagement, marriage and honeymoon yourself can
be challenging.
These have a permanent magnet center pole piece with
many turns of 'cat hair' wound around them. When the
teeth of a ferrous gear fly past the end of the pole
piece, the change in magnetic flux around the wires
generates a small, generally sinusoidal, ac waveform
with a frequency equal to teeth-per-second and an
amplitude proportional to teeth-per-second.
On the other hand, a 'hall effect device' for RPM
sensing generally depends on an external magnetic
field (like the one that spins around the shaft of
a magneto). It's usually a 3-wire device (ground,
signal and power) but CAN be a 2-wire device for
accommodating instruments. These need to be powered
up by 3-15 volts DC and the output signal is generally
a square wave, again frequency equal to pole passages
per second but an amplitude fixed to some value close
to the power supply voltage.
So if the sensor you're trying to test is indeed a Hall
Effect device, you'll need to wire it up to emulate the
power supply and signal loads present in normal operations.
Observation of a the output signal will require an
oscilloscope as opposed to a simple voltmeter.
>According to Klaus Savier's instructions the input signal from his
>device will record on the G3X
>His signal from the Plasma II puts out a square wave (rather than
>sine wave) at 10V amplitude and
>0.3me ? width. 2 pulses per revolution so about so for 2k rpm need
>4K pulses per min.
>Is there a reasonably priced pulse generator that will send out a
>signal like this or is there place to get it locally like radio shack ?
Sure, it's called a 555 timer. See schematic
Emacs!
According to the calculator just below this image at
http://home.cogeco.ca/~rpaisley4/LM555Astable.GIF
100 ohms at R1, 3300 ohms at R2, 4.7 uF at
C1 will give you about 45 Hz, 2700 pulses
per minute or 1350 rpm equivalent test signal.
Running this test generator on a 9v battery
would probably be close enough to the 10v pulse
generated by the Lightspeed system.
The flap indicator does not work. it is dependent upon a slde
potentiometer from Ray Allen
Is there a way to build a device to send a signal down the input wire
to the G3X that varies voltage ? The G3X displays 0.3 V on the flap
panel but no chage as I run the flaps up and down. I assume the max
voltage going in is 0.3V. I thought of using a 9 V battery with a
potentiometer and this may be useful for the fuel senders as well.
That seems likely.
I have yet to test the fuel tank senders to see if they work. Very
disappointed that this professionally assembled suite of Garmin
equipment has some major problems in receiving a signal.
Hard to tell if it is the senders or the LSU computer brain. So far
the senders all check out as working properly. My main problem is
getting access to data to safely test the input signal wires for the
RPM sensor, but Klaus Savier has some information on his Plasma II
device for electronic signal to the input of the RPM of the
G3X. Prior to installation I use OHM meter to make sure the supplied
harneses had continuity and correct pin readout. So much for plug-n-play.
Garmin is pretty good at displaying the right
numbers representing various system values. The
problem is with the wide variety of sensor styles,
scale factors, offsets and wave shapes. Had Garmin
supplied all components they would have been married
in production. But as you've discovered, doing the
engagement, marriage and honeymoon yourself can
be challenging.
Bob . . .
Message 3
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| Subject: | Re: Inexpensive CAD software |
We have used Autocad LT for years and it just works, but have been
looking for something more recent, just because some of our contractors
and customers send us files too new for our LT to read. I was very
pleasantly surprised with nanoCAD which seems to be a functional clone
of recent Autocad. It's from Russia and is free. Their business model
seems to be that the basic program is free but they have various other
add-on tools for sale. I haven't evaluated it closely yet but it looks
promising.
Another possibility is DraftSight from Dassault Systems (yes, the
Dassault that makes airplanes and owns SolidWorks). It's also free, for
Mac, Windows and soon Linux.
Message 4
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>Bob, the problem fuse is on the E-bus (Z-16) going to the SL-40
>radio. I have a 5A fuse there as called out in the installation manual.
Yeah, I recall now.
Okay, if you're blowing that fuse, it's because the
radio draws enough current to do it. Do I recall that
the fuse does not pop if the alternate feed switch to
the e-bus is closed? A useful experiment would be to
leave the alternate feed switch on for all normal ops.
Turn it on before master switch, off after master
switch. See if the fuse blowing behavior changes.
Bob . . .
Message 5
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| Subject: | Re: Inexpensive CAD software |
And then there's Siemens' Solid Edge Drafting, the 2D version of their super
expensive 3D Solid Edge PLM software.
It's free:
http://www.plm.automation.siemens.com/en_us/products/velocity/solidedge/free
2d/
-john-
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On
> Behalf Of D L Josephson
> Sent: Friday, June 15, 2012 10:25 AM
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Re: Inexpensive CAD software
>
> --> <dlj04@josephson.com>
>
> We have used Autocad LT for years and it just works, but have
> been looking for something more recent, just because some of
> our contractors and customers send us files too new for our
> LT to read. I was very pleasantly surprised with nanoCAD
> which seems to be a functional clone of recent Autocad. It's
> from Russia and is free. Their business model seems to be
> that the basic program is free but they have various other
> add-on tools for sale. I haven't evaluated it closely yet but
> it looks promising.
>
> Another possibility is DraftSight from Dassault Systems (yes,
> the Dassault that makes airplanes and owns SolidWorks). It's
> also free, for Mac, Windows and soon Linux.
>
Message 6
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| Subject: | Re: Inexpensive CAD software |
Are nanoCAD, DraughtSight and Solid Edge Drafting files compatible with lat
est and greatest AutoCAD files?- How easy or hard is it to migrate betwee
n all of these CAD packages?
Henador Titzoff
--- On Fri, 6/15/12, John Loram <johnl@loram.org> wrote:
From: John Loram <johnl@loram.org>
Subject: RE: AeroElectric-List: Re: Inexpensive CAD software
And then there's Siemens' Solid Edge Drafting, the 2D version of their supe
r
expensive 3D Solid Edge PLM software.
It's free:
http://www.plm.automation.siemens.com/en_us/products/velocity/solidedge/fre
e
2d/
-john-
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On
> Behalf Of D L Josephson
> Sent: Friday, June 15, 2012 10:25 AM
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Re: Inexpensive CAD software
>
> --> <dlj04@josephson.com>
>
> We have used Autocad LT for years and it just works, but have
> been looking for something more recent, just because some of
> our contractors and customers send us files too new for our
> LT to read. I was very pleasantly surprised with nanoCAD
> which seems to be a functional clone of recent Autocad. It's
> from Russia and is free. Their business model seems to be
> that the basic program is free but they have various other
> add-on tools for sale. I haven't evaluated it closely yet but
> it looks promising.
>
> Another possibility is DraftSight from Dassault Systems (yes,
> the Dassault that makes airplanes and owns SolidWorks). It's
> also free, for Mac, Windows and soon Linux.
>
le, List Admin.
Message 7
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| Subject: | Re: Inexpensive CAD software |
At 04:21 PM 6/15/2012, you wrote:
>Are nanoCAD, DraughtSight and Solid Edge Drafting files compatible
>with latest and greatest AutoCAD files? How easy or hard is it to
>migrate between all of these CAD packages?
>
>Henador Titzoff
I just downloaded and installed the nanoCAD program. Installation
was seamless. It has the look and feel of contemporary AutoCAD
programs. Opens, edits, prints and saves my .dwg AutoCAD files.
Fantastic value for the price . . . $0.
Bob . . .
Message 8
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| Subject: | Re: G3X Garmin EFIS |
thanks for your timely and accurate advice. I researched the internet last night
and it seems a number of schools use the 555 timer circuits. Your calculations
and drawing will make my my breadboard assembly easy. Unfortunately I found
major wiring snafu in G3X system. The signal input wire does trace to the
appropriate pin 17 of the 80 pin J732 LSU connector. Unfortunately I get a voltmeter
reading of 13.5 out of this wire. The power should come form pin 58
wire but has no power coming out. It seems this system is to complex to assemble,
even for a large avionics shop in northern US.
----- Original Message -----
From: Robert L. Nuckolls, III <nuckolls.bob@aeroelectric.com>
Sent: Thu, 14 Jun 2012 23:55:18 -0500 (CDT)
Subject: Re: AeroElectric-List: G3X Garmin EFIS
At 05:45 PM 6/14/2012, you wrote:
need advice
I want to test the hall effect sensor wire input to the G3X (Slick
Mag sensor from UMA). I have never gotten the rpm sensor to test as
one would a cam shaft hall effect sensor on a car with an analogue voltmeter.
Sensors that can be 'read' with an analog
voltmeter are generally variable reluctance
devices . . .
Magnetic sensors by CRA Division of Electro-Numerics
These have a permanent magnet center pole piece with
many turns of 'cat hair' wound around them. When the
teeth of a ferrous gear fly past the end of the pole
piece, the change in magnetic flux around the wires
generates a small, generally sinusoidal, ac waveform
with a frequency equal to teeth-per-second and an
amplitude proportional to teeth-per-second.
On the other hand, a 'hall effect device' for RPM
sensing generally depends on an external magnetic
field (like the one that spins around the shaft of
a magneto). It's usually a 3-wire device (ground,
signal and power) but CAN be a 2-wire device for
accommodating instruments. These need to be powered
up by 3-15 volts DC and the output signal is generally
a square wave, again frequency equal to pole passages
per second but an amplitude fixed to some value close
to the power supply voltage.
Emacs!
So if the sensor you're trying to test is indeed a Hall
Effect device, you'll need to wire it up to emulate the
power supply and signal loads present in normal operations.
Observation of a the output signal will require an
oscilloscope as opposed to a simple voltmeter.
According to Klaus Savier's instructions the input signal from his
device will record on the G3X
His signal from the Plasma II puts out a square wave (rather than
sine wave) at 10V amplitude and
0.3me ? width. 2 pulses per revolution so about so for 2k rpm need
4K pulses per min.
Is there a reasonably priced pulse generator that will send out a
signal like this or is there place to get it locally like radio shack ?
Sure, it's called a 555 timer.
The flap indicator does not work. it is dependent upon a slde
potentiometer from Ray Allen
Is there a way to build a device to send a signal down the input wire
to the G3X that varies voltage ? The G3X displays 0.3 V on the flap
panel but no chage as I run the flaps up and down. I assume the max
voltage going in is 0.3V. I thought of using a 9 V battery with a
potentiometer and this may be useful for the fuel senders as well.
That seems likely.
I have yet to test the fuel tank senders to see if they work. Very
disappointed that this professionally assembled suite of Garmin
equipment has some major problems in receiving a signal.
Hard to tell if it is the senders or the LSU computer brain. So far
the senders all check out as working properly. My main problem is
getting access to data to safely test the input signal wires for the
RPM sensor, but Klaus Savier has some information on his Plasma II
device for electronic signal to the input of the RPM of the
G3X. Prior to installation I use OHM meter to make sure the supplied
harneses had continuity and correct pin readout. So much for plug-n-play.
Garmin is pretty good at displaying the right
numbers representing various system values. The
problem is with the wide variety of sensor styles,
scale factors, offsets and wave shapes. Had Garmin
supplied all components they would have been married
in production. But as you've discovered, doing the
engagement, marriage and honeymoon yourself can
be challenging.
These have a permanent magnet center pole piece with
many turns of 'cat hair' wound around them. When the
teeth of a ferrous gear fly past the end of the pole
piece, the change in magnetic flux around the wires
generates a small, generally sinusoidal, ac waveform
with a frequency equal to teeth-per-second and an
amplitude proportional to teeth-per-second.
On the other hand, a 'hall effect device' for RPM
sensing generally depends on an external magnetic
field (like the one that spins around the shaft of
a magneto). It's usually a 3-wire device (ground,
signal and power) but CAN be a 2-wire device for
accommodating instruments. These need to be powered
up by 3-15 volts DC and the output signal is generally
a square wave, again frequency equal to pole passages
per second but an amplitude fixed to some value close
to the power supply voltage.
So if the sensor you're trying to test is indeed a Hall
Effect device, you'll need to wire it up to emulate the
power supply and signal loads present in normal operations.
Observation of a the output signal will require an
oscilloscope as opposed to a simple voltmeter.
>According to Klaus Savier's instructions the input signal from his
>device will record on the G3X
>His signal from the Plasma II puts out a square wave (rather than
>sine wave) at 10V amplitude and
>0.3me ? width. 2 pulses per revolution so about so for 2k rpm need
>4K pulses per min.
>Is there a reasonably priced pulse generator that will send out a
>signal like this or is there place to get it locally like radio shack ?
Sure, it's called a 555 timer. See schematic
Emacs!
According to the calculator just below this image at
http://home.cogeco.ca/~rpaisley4/LM555Astable.GIF
100 ohms at R1, 3300 ohms at R2, 4.7 uF at
C1 will give you about 45 Hz, 2700 pulses
per minute or 1350 rpm equivalent test signal.
Running this test generator on a 9v battery
would probably be close enough to the 10v pulse
generated by the Lightspeed system.
The flap indicator does not work. it is dependent upon a slde
potentiometer from Ray Allen
Is there a way to build a device to send a signal down the input wire
to the G3X that varies voltage ? The G3X displays 0.3 V on the flap
panel but no chage as I run the flaps up and down. I assume the max
voltage going in is 0.3V. I thought of using a 9 V battery with a
potentiometer and this may be useful for the fuel senders as well.
That seems likely.
I have yet to test the fuel tank senders to see if they work. Very
disappointed that this professionally assembled suite of Garmin
equipment has some major problems in receiving a signal.
Hard to tell if it is the senders or the LSU computer brain. So far
the senders all check out as working properly. My main problem is
getting access to data to safely test the input signal wires for the
RPM sensor, but Klaus Savier has some information on his Plasma II
device for electronic signal to the input of the RPM of the
G3X. Prior to installation I use OHM meter to make sure the supplied
harneses had continuity and correct pin readout. So much for plug-n-play.
Garmin is pretty good at displaying the right
numbers representing various system values. The
problem is with the wide variety of sensor styles,
scale factors, offsets and wave shapes. Had Garmin
supplied all components they would have been married
in production. But as you've discovered, doing the
engagement, marriage and honeymoon yourself can
be challenging.
Bob . . .
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