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Matt Dralle
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Joined: 08 Nov 2005
Posts: 25627
Location: Livermore CA USA
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 Posted: Sun Apr 11, 2010 9:28 am Post subject: Circuit To Combine Mag P-Lead For RPM Measurements |
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Has anyone found a device or circuit to pick off the output from the P leads on the left and right mags for feeding to an RPM measuring device such as the GRT EIS-4000? The EIS-4000 only has a single RPM input. The installation manual suggests installing a SPDT switch between the left/right mags and then to the input on the EIS-4000 for manually switching between the mags during drop testing. But that's pretty hoekey. Seems like someone should have come up with a simple prioritized switching circuit that would, say, always read the left mag p lead unless there wasn't a signal, then read the right mag P lead output. In my "spare time" maybe I'll make one if there isn't something already out there like this.
I thought that once upon a time I saw an electronic gizmo you could screw into the standard tack drive that would give an electronic output. Anyone have a line on this device and whether its compatible with the GRT EIS?
Thanks!!
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
Status: Final Bits/Inspection/Test Flight
| | - The Matronics RV8-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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Matt Dralle
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gfr56(at)comcast.net
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| Posted: Sun Apr 11, 2010 10:49 am Post subject: Circuit To Combine Mag P-Lead For RPM Measurements |
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I can offer nothing on the pick off option from the P lead....but... The GRT EIS 4000 now can take 2 inputs for RPM and displays RPM #1 if it is present . Your older unit may be upgradable. Jerry
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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25627
Location: Livermore CA USA
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| Posted: Sun Apr 11, 2010 1:20 pm Post subject: Circuit To Combine Mag P-Lead For RPM Measurements |
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Yes, I do remember that thread. In fact, I have those pickups installed, but I'm not getting any reading on the EIS-4000 with either one of them. I'm using the vent hole closest to the engine block. Have you successfully interfaced them to the EIS-4000?
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
Status: Final Bits/Inspection/Test Flight
At 02:12 PM 4/11/2010 Sunday, you wrote:
| Quote: |
Matt,
You may recall that I provided a suggestion of using a Westach inductive sender when you asked this question on the GRT yahoo group over a year ago:
http://groups.yahoo.com/group/GRT_EFIS/message/6872
Skylor
Sent from my iPhone.
On Apr 11, 2010, at 10:26 AM, Matt Dralle <dralle(at)matronics.com> wrote:
Has anyone found a device or circuit to pick off the output from the P leads on the left and right mags for feeding to an RPM measuring device such as the GRT EIS-4000? The EIS-4000 only has a single RPM input. The installation manual suggests installing a SPDT switch between the left/right mags and then to the input on the EIS-4000 for manually switching between the mags during drop testing. But that's pretty hoekey. Seems like someone should have come up with a simple prioritized switching circuit that would, say, always read the left mag p lead unless there wasn't a signal, then read the right mag P lead output. In my "spare time" maybe I'll make one if there isn't something already out there like this.
I thought that once upon a time I saw an electronic gizmo you could screw into the standard tack drive that would give an electronic output. Anyone have a line on this device and whether its compatible with the GRT EIS?
Thanks!!
Matt Dralle
|
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
Status: Final Bits/Inspection/Test Flight
| | - The Matronics RV8-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:
http://www.matronics.com/Navigator?RV8-List |
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Matt Dralle
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skylor4(at)yahoo.com
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| Posted: Sun Apr 11, 2010 1:47 pm Post subject: Circuit To Combine Mag P-Lead For RPM Measurements |
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What are you using for excitation voltage to the sender?
Honestly, I haven't run my engine yet, but I was able to get the EIS to indicate an RPM readind by "waving" a small magnet across the sensor. The excitation voltage has to be 12 volts or so (a 5 volt source doesn't produce enough signal voltage for the EIS).
Skylor
Sent from my iPhone.
On Apr 11, 2010, at 2:19 PM, Matt Dralle <dralle(at)matronics.com> wrote:
Yes, I do remember that thread. In fact, I have those pickups installed, but I'm not getting any reading on the EIS-4000 with either one of them. I'm using the vent hole closest to the engine block. Have you successfully interfaced them to the EIS-4000?
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
Status: Final Bits/Inspection/Test Flight
At 02:12 PM 4/11/2010 Sunday, you wrote:
Matt,
You may recall that I provided a suggestion of using a Westach inductive sender when you asked this question on the GRT yahoo group over a year ago:
http://groups.yahoo.com/group/GRT_EFIS/message/6872
Skylor
Sent from my iPhone.
On Apr 11, 2010, at 10:26 AM, Matt Dralle <dralle(at)matronics.com> wrote:
Has anyone found a device or circuit to pick off the output from the P leads on the left and right mags for feeding to an RPM measuring device such as the GRT EIS-4000? The EIS-4000 only has a single RPM input. The installation manual suggests installing a SPDT switch between the left/right mags and then to the input on the EIS-4000 for manually switching between the mags during drop testing. But that's pretty hoekey. Seems like someone should have come up with a simple prioritized switching circuit that would, say, always read the left mag p lead unless there wasn't a signal, then read the right mag P lead output. In my "spare time" maybe I'll make one if there isn't something already out there like this.
I thought that once upon a time I saw an electronic gizmo you could screw into the standard tack drive that would give an electronic output. Anyone have a line on this device and whether its compatible with the GRT EIS?
Thanks!!
Matt Dralle
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
Status: Final Bits/Inspection/Test Flight
| | - The Matronics RV8-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:
http://www.matronics.com/Navigator?RV8-List |
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