8- 4 Keysight N9912-90001 User’s Guide
SA (Spectrum Analyzer) Mode
SA Mode Settings
8-
SA Mode Settings
Select SA Mode before making any setting in this chapter.
Because there is no calibration, these settings can be made in any order.
How to select SA Mode
—Press Mode_
—Then SA
.
Frequency Range
The X-axis frequency range determines the frequencies that are measured for
each sweep. The default Start frequency is 0 Hz. However, the Start frequency
can be set as low as –100 MHz. The internal LO of the FieldFox can be seen at
0 Hz, which will mask signals that may be present.
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 in “Channel Selection” on page 8-7.
— Using Marker -> Center (frequency). Learn how in “How to use Marker
Functions” on page 16-12.
How to set Frequency Range
—Press Freq/Dist.
— Then choose from the following:
— 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.
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.
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