Technical Manual
Page 5
CODEL
OPS.109
Issue : B
Rev. : 1
Date : 23/10/13
Doc. i/d : 0109/6
Ref. : 090028
In the V-CEM5100 the correlogram is inverted as follows:
Consequently in order to determine the
max. value the correlogram is scanned to find the minimum.
The first element of the correlogram corresponds to a zero time delay and the 256th element corresponds to
255 time delay increments. Hence, if a
DATA RATE
of 1ms is selected the 256th element corresponds to a time
delay of 255ms.
Displacement is the point on the ‘x’ axis of the correlogram that coincides with the minimum. The correlation
coefficient is defined as :
Correlation Coefficient =
max. value
– min. value
x
100%
max. value
and is a measure of the confidence at the measurement. Coefficient values of less than 10% would indicate a
non-acceptable measurement.