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Old 08-26-2011, 06:14 PM   #1
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Default DIYPNP/MTX-L Signal voltage

I know this subject has been beat to death, but I'm coming up with a voltage difference between my MTX-L output and where it meets the Db15 connector. From the MTX-L it measures a steady .5 VDC Lower than where it meets the MS. So where is the extra voltage coming from? I'v tried about a million different ground locations, so I have ruled that out. Is there some reason the MS would be sending voltage to the connection?

This thing is driving me batshit crazy.
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Old 08-26-2011, 06:32 PM   #2
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Pics always help. I do realize that soldering is the proper way, and all other connections are soldered. This one is using a butt connector because I don't want to solder/heatshrink the connection until I'm sure I won't have to take it apart again.
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DIYPNP/MTX-L Signal voltage-imag0155.jpg   DIYPNP/MTX-L Signal voltage-imag0158.jpg  
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Old 08-26-2011, 06:50 PM   #3
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use the custom calibration for the AFR input, make it match and win.

I have to use .22v for my 7.35:1 value.



your DMM shows a .06v difference.
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Old 08-26-2011, 07:25 PM   #4
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Yeah, it was bouncing back and forth between .5 and .6 difference when I took the picture. Ok, I'm trying the custom linear wideband setting, and it seems to be working. Getting the voltage at 22.3 is easy, how do I calculate the what voltage should be at 7.35?
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Old 08-26-2011, 07:34 PM   #5
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thats just what i changed to get my two gauges to match.
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Old 08-26-2011, 08:01 PM   #6
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Cool. I'll set the point at 22.3 and play around with the 7.35 to match. Really appreciate the help.
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