Lab.gruppen PLM 20K44 - Manual (Page 212)

Lake Controller Operation Manual Rev 1.5.4
Analyzer Plug-in
207
18.4.2.2 Amplitude Range
▸ Move Primary Up:
Move displayed range upward to show higher magnitudes
▸ Move Primary Down:
Move displayed range downward to show lower magnitudes
▸ Zoom Primary In:
Magnify displayed vertical range for most plot types; narrows magnitude range for Spectrograph
▸ Zoom Primary Out:
Decrease magnification of vertical range for most plot types; widens magnitude range for Spectrograph
18.4.2.3 Banding
The BANDING submenu provides options for the horizontal (x‐axis) scaling of the RTA; whole-octave,
1/3-octave, 1/6-octave, 1/12-octave and 1/24‐octave resolutions.
18.4.3 Spectrograph Measurement Mode
The Spectrograph displays frequency content of an input signal over a period of time. Instead of displaying
results for one measurement at a time (whether averaged or instantaneous), as per the Spectrum display,
the Spectrograph displays a measurement history over an adjustable period of time.
A Spectrum analyzer displays magnitude values for each fractional octave frequency band indicated by
vertical bars of varying height; a Spectrograph indicates the “height” using a range of colors to indicate
higher or lower magnitude.
The Spectrograph displays three‐dimensional data (time, frequency, and energy) on a two‐dimensional plot
with time on the y‐axis, frequency on the x‐axis, and magnitude represented by color. Exactly which color
represents which magnitude value is determined by the magnitude range specified.