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Old 11-24-2011, 09:43 AM   #1
simple man
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Default SOC meter adjustment.

This is probably a question for " JohnnieB ", but anyone feel free to chime in! In a previous post we were discussing adjustments to the SOC meter by adding some resistance to the circuit ( meter reads high ). Quite by accident, I was moving some things around on the front shelf of my cart and one of these items is a small magnet. I swung this over my dashboard and viola SOC needle moves! I found that I can put the magnet in a certain place ( to the right of the meter )on the dash and it puts the needle right into the top of the green area on the gauge, where it is supposed to be for the battery pack voltage! Ok, is this going to harm the gauge, and will it still read correctly if it is not harmed? If this is Ok to do, what an easy way to adjust an analog gauge!
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Old 11-24-2011, 10:36 AM   #2
yurtle
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Default Re: SOC meter adjustment.

Quote:
Originally Posted by simple man View Post
This is probably a question for " JohnnieB ", but anyone feel free to chime in! In a previous post we were discussing adjustments to the SOC meter by adding some resistance to the circuit ( meter reads high ). Quite by accident, I was moving some things around on the front shelf of my cart and one of these items is a small magnet. I swung this over my dashboard and viola SOC needle moves! I found that I can put the magnet in a certain place ( to the right of the meter )on the dash and put the needle right into the top of the green area on the gauge, where it is supposed to be for the battery pack voltage! Ok, is this going to harm the gauge, and will it still read correctly if it is not harmed? If this is Ok to do, what an easy way to adjust an analog gauge!
The movement of the gauge is electromagnetic, so I wouldn't recommend using a permanent magnet for fine tuning. I've used potentiometers (variable resistors) to correct analog gauges that had numbers on them for direct readout. Since this is only red, green and white, I just memorized where the needle normally was at various states of charge. As the batteries dropped throughout the day, depending on state of charge and number of passengers, I found it was most useful in monitoring as we climbed hills.

You could always draw lines on the lens with a sharpy.
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Old 11-24-2011, 10:55 AM   #3
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Default Re: SOC meter adjustment.

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Originally Posted by yurtle View Post
The movement of the gauge is electromagnetic, so I wouldn't recommend using a permanent magnet for fine tuning. I've used potentiometers (variable resistors) to correct analog gauges that had numbers on them for direct readout. Since this is only red, green and white, I just memorized where the needle normally was at various states of charge. As the batteries dropped throughout the day, depending on state of charge and number of passengers, I found it was most useful in monitoring as we climbed hills.

You could always draw lines on the lens with a sharpy.
Thanks, Just what I need to know! Yeah, I love the gauge! It doesn't bother me a bit that the scale is off some. I will just remember where the percent of charge is in relation to it. The only reason I didn't want a digital voltmeter is that display flipping back and forth would drive me crazy! This gauges readout is smooth and easy to see! I do have an " el cheapo " voltmeter I mounted on a charger plug, so I can just plug it in and compare readings if I want to!
Have a Good Thanksgiving!!!
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Old 11-24-2011, 11:54 AM   #4
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Default Re: SOC meter adjustment.

Here's the basic D'Arsonval meter movement. The spring (green line) tries to keep the pointer counterclockwise and current through the coil tries to deflect it clockwise.
You add resistance in series with the coil to make it a voltmeter and shunt the coil to make it an ammeter.
If you mess with the magnet, you'll change the sensitivity and linearity. (Not that it matters too much for a SOC meter )

Have a Happy Thanksgiving you guys....
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Old 11-24-2011, 12:38 PM   #5
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Default Re: SOC meter adjustment.

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Originally Posted by JohnnieB View Post
Here's the basic D'Arsonval meter movement. The spring (green line) tries to keep the pointer counterclockwise and current through the coil tries to deflect it clockwise.
You add resistance in series with the coil to make it a voltmeter and shunt the coil to make it an ammeter.
If you mess with the magnet, you'll change the sensitivity and linearity. (Not that it matters too much for a SOC meter )

Have a Happy Thanksgiving you guys....
Cool John!
The magnet's been put back over on the right side of the dash, well away from the dash panel!
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Old 11-24-2011, 12:56 PM   #6
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Default Re: SOC meter adjustment.

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Originally Posted by simple man View Post
Cool John!
The magnet's been put back over on the right side of the dash, well away from the dash panel!
Over by the Compass?
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