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Chapter 4 105
Making Measurements
Making the Spectrum (Frequency Domain) Measurement
Changing the Display
The Span key under the Meas Setup menu controls the horizontal span of
the
Spectrum Linear window. If the SPAN X Scale key is pressed, this Span
key is activated, while the
AMPLITUDE Y Scale key allows you to access
the menus to modify the vertical parameters depending on the selected
windows.
Changing the Linear Spectrum Display
If the
Linear Spectrum window is active in the Spectrum Linear view, the
SPAN X Scale and AMPLITUDE Y Scale keys access the menus to modify
the following parameters:
• With the
SPAN X Scale key:
—
Span - Allows you to modify the frequency span. The range is
10.000 Hz to 10.000 MHz with 1 Hz resolution, depending on the
Res BW setting. Changing the span causes the resolution
bandwidth to change automatically, and will affect data
acquisition time.
• With the
AMPLITUDE Y Scale key:
—
Scale/Div - Allows you to set the vertical scale by changing an
amplitude value per division. The range is 1.00 nV to 20.00 V per
division. The default setting is 100.0 mV. However, since the
Scale
Coupling
default is On, this value is automatically determined by
the measurement results. To manually set this value
Scale
Coupling
must be Off.
—
Ref Value - Allows you to set the reference value ranging from
−250.00 to 250.00 V. The default setting is 0.00 V. However, since
the
Scale Coupling default is On, this value is automatically
determined by the measurement results. To manually set this
value
Scale Coupling must be Off.
—
Ref Position - Allows you to set the reference position to either Top,
Ctr (center) or Bot (bottom). The default setting is Ctr.
—
Scale Coupling - Allows you to toggle the scale coupling function
between
On and Off. The default setting is On. Upon pressing the
Restart front-panel key or Restart softkey under the Meas Control
menu, this function automatically determines the scale per
division and reference values based on the measurement results.
To manually set either
Scale/Div or Ref Value values, Scale Coupling
must be Off.