- SEB4LO a écrit:
- The data from a knock sensor is not a frequency but a voltage ...
You get it with a piezo sensor like that
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To get a calibration , i would compare to an HRC unit with dataloguer and the fix the V graduations of the deto as you can find in the dataloguer HRC
as long as you mention any frequency has a tension measred in volts,dB
there is no V graduations ther is a tension measured in Volts.
But dataloggers usually log n. of deto events, not sure what you mean
but don't get me wrong I apreciate the effort to help I assume
The piezoeletric accelerometer (aka knock sensor) measure G force and generates a voltage as result,that can also be express in dB.
a detonation will reverberate in a specific frequency inherent to the engine type,I got this from a car,but it is a wide band sensor and I do have the data sheet
it also detects all the mechanical noise hence the need for filtering
Level calibration is a no brainer
if you have a HRC laying about I can borrow,I'd appreciate because had I the money to buy one I wouldn't be building it.
I will publish a circuit diagram with a bright led VUimeter monitor,3 digit counter and debounced I/0 logic output to drive for ex. a back off advance for the CDI or switch a 2nd curve
All with standard components
I'm asking for a kHz figure for a 2 stroke [Vous devez être inscrit et connecté pour voir cette image]