User Manual

3.10 FFT Analysis Modes

Waveform Example

This instrument provides a circular cross-correlation function.

Analysis results are normalized to the maximum value.

Cross-Correlation Function CCR

Using two input signals, shows the correlation of two points on the input signal at time differential t.

Output is displayed as a function of differential time t.

Main uses:

• To determine the phase shift of two signals per unit of time

• To determine the speed and distance of time lag between two signals

See About the Functions "3.10.2 Analysis Mode Functions" (⇒ p. 102)

Axis Display Type Description

X axis Linear

Time display

The center (t = 0) is the reference. To the right is lag time (+t), and to the left is

lead time (-t)

Y axis Lin-Mag

+1 to -1 is displayed in dimensionless units.

At time differential t, this value is +1 when the correlation of input and output sig-

nals is the closest, and 0 when correlation is the least. -1 indicates completely

reversed polarity.

X axis: Linear

Y axis: Lin-Mag

CH1 (Input 1)

CH2 (Input 2)

CCR (Output)