Chapter 2 Working with DaqLab 75
Delta Y
)0(
11
=
tGGy
Draws a line of the difference between the Y-coordinate of every point and Y-
coordinate of the first point. Use this function to move the data set along the Y-axis
so that the point will intersect the Y- axis at the origin.
Derivative
ratesampling
t
t
yy
y
nn
n
1
,
2
11
=Δ
Δ
−
=
−+
Draws a line of the slopes of every three consecutive points of a data set. For high
recording rates and small Δt, this line may be very noisy, which is why smoothing the
data set is recommended before applying the derivative function.
Divide
22
11
GC
GC
y =
Draws a line of the division of two data sets
Envelope
(lower)
Lower envelope of G
1
with tolerance of C
1
points
Draws a line that connects the minimum values of a data set. The tolerance defines
the minimum distance (in sampling points) between two minima, so that the envelope
function is able to ignore random noises.
Envelope
(upper)
Upper envelope of G
1
with tolerance of C
1
points
Draws a line that connects the maximum values of a data set. The tolerance defines
the minimum distance (in sampling points) between two maxima, so that the
envelope function will be able to ignore random noises.
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