Agilent Technologies FieldFox N9912A, User Manual

Page: 71 / 209

SA (Spectrum Analyzer) Mode 71
NOTE Although the start frequency can be set as low as -100 MHz, amplitude accuracy
is specified above 2 MHz. Below 2 MHz, frequency accuracy is maintained, but
amplitude accuracy is degraded.
The frequency range of the measurement can be changed using the following
methods:

Set Center and Span frequencies

Set Start and Stop frequencies

Toggle between Zero and Last selected span

Set Full Span of the FieldFox

Using Channel selection. Learn how on page 73.

Using Marker -> Center (frequency). Learn how on page 139.
How to set Frequency Range

Press
Freq/Dist
.

Then choose from the following:
o
Center
and
Freq Span
frequencies. This is the most common method of
entering frequency range. Enter the frequency of interest. The Center
frequency is at the exact center of the X-axis. The Frequency Span places
half of the frequency range on either side of center. When the Center and
Frequency Span values are entered, then the X-axis annotation on the screen
shows the Center and Span frequencies.
o
Start
and
Stop
frequencies. Start is the beginning of the X-axis and Stop is
the end of the X-axis. When the Start and Stop frequencies are entered, then
the X-axis annotation on the screen shows the Start and Stop frequencies.

Follow each of these by entering a value using the numeric keypad, the
▲|▼
arrows, or the rotary knob.

When using the
▲|▼
arrows, press
Enter
. The increment setting of the arrows
is based on the current span. This can be changed in SA Mode. See How to
change frequency step size below.

After using the keypad, select a multiplier key. Learn about multiplier
abbreviations on page 19.
Two more ways to change the frequency range

Press
Freq/Dist
.

Then choose from the following:
o
Zero/Last Span
Each key press toggles the frequency span between 0 Hz
and the last specified frequency span.
o
More
o
Then
Full Span
Selects the entire frequency span of the FieldFox. The
Center frequency is set automatically.