Kit Encoders...Why x2 and x4 have extra noise!?

[vamfun]

2010 Thread update:


Team 1771 took some near max speed encoder data in support of this thread http://www.chiefdelphi.com/forums/sh...d=1#post953400. I analyzed the data and posted it here:

http://www.scribd.com/doc/29880227/1771-Encoder-Tests. Downloading will give a better format on the pictures and data.

It compares about 1.5 seconds of data for 1x,2x,4x encoder configs.
Summary:
Left Encoder
1x sigma = .30 fps (4.1% of average)
2x sigma = .48 fps (6.5%)
4x sigma = 1.68 fps (18.2%)

Right encoder
4x sigma = .49 (5.2%)