54
│ 4 Settings
4.3.1.3 Correlation curve
The correlation curve can be displayed in different ways.
The options are:
●
Positive
Displays the magnitude of the positive and negative values.
The correlation curve is above the x-axis.
●
Positive and negative
Displays both positive and negative values. The correlation
curve oscillates around the x-axis.
4.3.1.4
Blocking filter
The blocking filter is an electronic filter which filters out the mains
frequency of the power supply. This minimises the impact of cur-
rent-carrying electrical lines on the noise.
The options are:
●
60 Hz | 50 Hz
Mains frequency that can be selected.
●
Off
The blocking filter is disabled.
4.3.2
Filter basis
The noises can be displayed as a graph based on different func
-
tions in the
Filter
menu.
The options are:
●
Coherence
●
Cross spectrum
●
Spectrum 1
●
Spectrum 2
●
Sound velocity
Up to a maximum of two functions can be displayed at the same
time.
