Quote:
Originally Posted by ArtPE
I agree, a margin of error or tolerance is always required...
what are the specs/accuracy on the accelerometer, A/D convertor, etc. (rhetorical question  ) what are the bits of the signal? this will help us select the sampling rate...
why couldn't you have -a? wouldn't the car 'slow down' (relatively) during the shift...
40 mph
shift
39.9 mph
the accelerate again?
just curious |
The accel is quoted as:
- 0.5 mV/g nominal output (sensitivity)
- bandwidth 0-1.5 kHz, 3% down on output at 500Hz, no specs given for higher frequencies
- 0.3% non linearity
- an odd accuracy spec., 0.3 mg/sqrt(Hz). ???.
You can get the entire spec sheet in my post #10.
The data sheet for the DAQ is attached. So many "accuracy" specs available it is tough to determine how much noise may be from the DAQ. Not my area of expertise. My gut tell me very, very little.
In general a car can slow down during a shift (well D3 yes, S4, no, if we believe this data!). My point was that the car can not be decelerating before any shift initiation (as the car was nearly pegged!). This makes the mounting and noise problems very obvious.
As well, as I mentioned previously, this accel was overloaded on input based on a typo on a supplied data sheet. I am going to get it repaired and recalibrated or replaced (on their dime!) soon, just to be sure.
Lastly a truly regulated DC power supply like
this one. Might improve noise as well.
Any more donors??