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Old 09-12-2022 | 09:57 AM
  #783  
cmulder
 
Joined: Jan 2005
Posts: 228
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From: cork, IRELAND
Post try a "pull down" resistor
Originally Posted by Cat 1
Dave, Do you use the RCExl tach output for an RPM feed into OpenXsensor? I seem to be having trouble with getting a good signal there - Its very noisy (high frequency). If I Play with the scope settings I can see the pulse for the ignition but lots of noise on top of it.. Is a filter required?

Im was assuming the signal is an +5v / 0V situation like the Trigger Hall but it seems to be A weak (low voltage/current?) signal. Should be signal to pin 8 and ground to ground correct...
Likely there is almost no current flowing so any external noise has a relative big influence.
If you place a resistor between the pulse and ground then that resistor will "short" the noise but not the signal.
The sensor is designed to be able to give a current high enough to still have a good output pulse.

more theory and how to choose resistor value
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