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Circuit To Combine Mag P-Lead For RPM Measurements

 
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Matt Dralle
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Joined: 08 Nov 2005
Posts: 26321
Location: Livermore CA USA
PostPosted: Sun Apr 11, 2010 9:28 am    Post subject: Circuit To Combine Mag P-Lead For RPM Measurements Reply with quote
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

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PostPosted: Sun Apr 11, 2010 10:04 am    Post subject: Circuit To Combine Mag P-Lead For RPM Measurements Reply with quote
Matt-

The Vision Microsystems did it on the VM1000 is they have a simple inductive pickup (their P/N 3010005 for the Slick mags) that screws into the vent cap location on the right mag and picks up the movement of the rotor. It's a little pricey though ($380).

-GV

In a message dated 4/11/2010 10:29:21 A.M. Pacific Daylight Time, dralle(at)matronics.com writes:
Quote:
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.

[quote][b]

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Matt Dralle
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Joined: 08 Nov 2005
Posts: 26321
Location: Livermore CA USA
PostPosted: Sun Apr 11, 2010 1:20 pm    Post subject: Circuit To Combine Mag P-Lead For RPM Measurements Reply with quote
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

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khorton01(at)rogers.com
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PostPosted: Sun Apr 11, 2010 4:34 pm    Post subject: Circuit To Combine Mag P-Lead For RPM Measurements Reply with quote
I sent my EIS 4000 back to Grand Rapids for updating to the latest
firmware while my aircraft was down for paint. Looking at the new manual
that came back with the updated unit, I see that it now has two rpm
inputs, and it looks like it will automatically switch between them to
pick the one that has a signal at any given time. This seems to be
intended to solve exactly your problem.

Open questions, which are maybe answered in the manual, but I forgot it
at work, so I can't check now:

1. what happens if the two ignition systems that are connected to the
two inputs require different pulse/revolution numbers? I don't recall
seeing a way to define different pulse/revolution numbers for the two
rpm inputs.

2. which rpm input does it use when both have a signal?

I recommend you contact GRT. Perhaps you simply need to get your EIS
updated. They turn them around pretty quickly, so you won't lose much time.

Kevin Horton
RV-8
Ottawa, Canada

Matt Dralle wrote:
Quote:

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



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