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22/08/12
Hi Marcell. Bad news the pullup resistor does not work. I fitted a trimpot 80-100kohm and adjusted voltage from 130mv to 170mv in 5mv increments with no luck. Please find attached log files. It seems we have to go 60-2. Thank you. Morne 21/07/2012 Measurement results with scope on G4 sensor. Conclusion signal way lower than standard, too low for VEMS to pick up. * Stock sensor (but non-standard pin in the flywheel) 130mV AC. |
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Non-standard flywheel, crankhome-VR signal way lower than standard, apparently signal is lower than noise ?
* Stock sensor (but non-standard pin in the flywheel) only 130mV AC (10 times lower than factory). |
| ** reason for the low signal: flywheel was replaced with a spec unit and the pin is not as bulky as the original pin on the original flywheel. |
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* Bad news the stronger pullup resistor does not work.
** I fitted a trimpot 80-100kohm and adjusted voltage from 130mv to 170mv in 5mv increments with no luck. * Please find attached log files. where exactly ? * It seems we have to go 60-2. * there is one more thing that could be used to suppress the extreme noise (compared to the very low level signal), a capacitor between crankhome-VR signal and GND: ** maybe 100nF initially, good to test the concept but finally max 47nF capacitor would be desired if possible (so delay=C*1kOhm would be less than about 2 crankdeg at 6000 RPM). |
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I managed to find the reason for the low signal from the sensor. The flywheel was replaced with a spec unit and the pin is not as bulky as the original pin on the original flywheel. |
| * other option: make the sectrig extremely sensitive (and hope that noise does not become a problem). |
| * other option: make the sectrig extremely sensitive (we did that, but noise does not become a problem). |