analog input 1 loosing signal
Posted: Wed Mar 02, 2011 6:33 am
Hi all,
I had this post in another section, but I had no answer for a few days, so I'm posting here:
I connected a Phormula KS4 knock sensor (http://www.phormula.co.uk/KnockMonitor-KS-4.aspx) to analog input 1 in S300 (I had to mount the 0.1uF capacitor in C42). This knock sensor displays engine noise as a 0-100 value and outputs an analog 0-5v output to connect to logging systems. It was working, I was able to immediately pick the KS4 signal in smanager, showing a minimum 0.2v and going up as engine noise increased.
Problem is, after a few minutes, the signal from analog input 1 in s300 will drop to zero, even when the KS4 displays high noise levels. I mean, after 5-6 minutes, I get a fixed 0v analog input from s300, no matter what value is displayed in KS4.
Turning ignition off and on doesn't cure it, but if I try again the next day it will be fine for another few minutes, but will get stuck to zero after a while.
I'm still doing tests to figure this out, I was able to check the signal output from the sensor, and it remains stable, even when s300 reads zero. I had the feeling that the signal drop occurs after some hard accelerations (too high voltage into S300?), but I'm still to confirm this.
I hope any of you s300 experts could tell me what is going on, and what I can do to fix it. I really need to get knock into the S300 to proceed with my project.
Thanks.
I had this post in another section, but I had no answer for a few days, so I'm posting here:
I connected a Phormula KS4 knock sensor (http://www.phormula.co.uk/KnockMonitor-KS-4.aspx) to analog input 1 in S300 (I had to mount the 0.1uF capacitor in C42). This knock sensor displays engine noise as a 0-100 value and outputs an analog 0-5v output to connect to logging systems. It was working, I was able to immediately pick the KS4 signal in smanager, showing a minimum 0.2v and going up as engine noise increased.
Problem is, after a few minutes, the signal from analog input 1 in s300 will drop to zero, even when the KS4 displays high noise levels. I mean, after 5-6 minutes, I get a fixed 0v analog input from s300, no matter what value is displayed in KS4.
Turning ignition off and on doesn't cure it, but if I try again the next day it will be fine for another few minutes, but will get stuck to zero after a while.
I'm still doing tests to figure this out, I was able to check the signal output from the sensor, and it remains stable, even when s300 reads zero. I had the feeling that the signal drop occurs after some hard accelerations (too high voltage into S300?), but I'm still to confirm this.
I hope any of you s300 experts could tell me what is going on, and what I can do to fix it. I really need to get knock into the S300 to proceed with my project.
Thanks.