Abstract
The probability distributions of switching delay in the circuit of wall attachment devices can be described as similar to a weibull distribution. Histograms and probability distributions are investigated by 500 or 600 measurements in each test. The effects of tubing to swiching probability are measured statistically in cascaded OR-NOR devices. The minimum switching delay is evaluated by extrapolation 0.55ms by a series of 100 measurements.
The triggering pressure levels to open and to close the gate of electronic time counter have a close connection with the switching probability distribution. Noise effect in output signal can be eliminated by setting the triggering level at 90% of the output height is obtained after the effect of reflection is taken away.
The reflected compression waves cause a high rate of switching probability density observed also in the initial switching. On the other hand, reflected expansion waves cut down the probability density or switch back the main jet after switching in a particular case. The tube size to match the nozzle size of the device is calculated to be 1.25mm in the evaluated signal height. The minimum switching delay was obtained with a 2mm tube.
