Zero Span Measurements - Keysight N9912A User Manual

 When the sweep time exceeds 4000 seconds (about 1 hour),

Zero Span Measurements

When setting the frequency span to Zero, there is NO spectrum of frequencies to
display, so the X-axis units becomes Time. The SA becomes like a tunable
oscilloscope, with the center frequency being the frequency of interest. This
capability is useful for analyzing modulation characteristics, such as pulsed
measurements.
GSM signal, framed data format, timeslot 0 and 3 on. Sweep Time is set to
approximately the frame interval. Press Single several times until the
waveform section of interest is viewable and stable. Then markers can be
used to measure the timeslot width and interval as shown.
How to set Zero Span
 Set
How to change Sweep Time in Zero Span.
 Press Sweep 3
 Then
 Enter a value using the numeric keypad.
 Then select a multiplier key. Learn about multiplier abbreviations on page 19.
When the sweep time is longer than can be acquired with the current available
memory,
Four times the amount of memory is available with the FieldFox A.04.00 release,
allowing longer sweep times in Zero Span.
84
annotated on the screen. Accuracy cannot be guaranteed.
to the frequency of interest
Center
then set to 0 Hz
Span
o
or select Span. Each key press toggles the frequency span between
Zero/Last
o
0 Hz and the last specified frequency span.
SweepTime
is displayed on the screen. Learn more on page 91.
Meas UNCAL
is
Meas UNCAL
FieldFox User's Guide