NARDA EHP-50-G, User Manual

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Description 4-5
4.4 Span section
EHP-50G includes an FFT analyzer to show frequency spectrum of
measured field. The span section includes the following:
Span : select one of the 8 available spans, keeping in mind that beside the
EHP-50G minimum operating frequency of 1 Hz, the minimum start
frequency of each Span is 1,2% of Span. For example, selecting 1 kHz
span the minimum start frequency should be 12 Hz (automatically adjusted
to the nearer step available of 12.5 Hz).This to avoid that the 0Hz signal,
common to every spectrum analyzer, is included in the measurement result.
Start frequency of 100 Hz and 200 Hz span is therefore 1 Hz (minimum
operating frequency).
Zoom : EHP-50G performs selective measurement over the entire
frequency range defined by the Span setting. EHP50-TS is able to select
data in order to display a user specified frequency band within the selected
span. For this purpose, the Zoom function can be set by typing the relevant
parameters through the PC keyboard or, graphically, by means of the PC
mouse.
Within the selected frequency
span , you can operate a zoom function to
define a specific frequency range over which perform your measurement.
For this purpose
Start, Stop, Center and Span can be set to easily define
frequencies to be displayed. The Full Span button deactivate the Zoom
function showing the whole Span selected.
Right click and drag on the graph window to define graphically the
Zoom frequency range.
Fig.4-2 Defining frequency band through the PC mouse