q
RSSI — RSSI provides a way to see the scrolling display of received signal
strength in zero span. Once a full screen of data has been acquired, the oldest
data disappears off the left edge of the display.
q
Time Interval — Time Interval sets the time between data points. The in
-
terval can be set from 150 ms to 1 minute. Enter the number using the
Up/Down arrow key or use the keypad and select the appropriate soft key
for minutes, seconds, or milliseconds.
q
Time Span — Time Span sets the total duration of measurements. This
value can be set from 1 minute to 7 days. A setting of zero (MANUAL )
can also be entered if no limit on the time span is desired.
q
Auto Scale Data — Auto Scale Data sets the reference level and scale fac
-
tor to values that spread the data vertically over as much of the screen as
possible, with the reference level set in 0.1 dB steps and vertical scaling
set in 1 dB steps from 1 dB to 15 dB per division.
q
Log Data Off/On — Log Data Off/On selects if data will be automatically
logged. When data logging is on, information is stored after each full
screen of data has been captured. Saved data is named by using the word
"LOG" and a dash followed by the time to the nearest second in 24-hour
clock format, such as "LOG - 14:43:01. Select the RECALL DISPLAY
(0) key to view and recall the saved data (page 3-15).
q
Back — Returns to the previous menu level.
q
Signal ID — Signal Identification is used to determine, if possible, the air in-
terface standard of a signal. If the instrument is unable to determine the mod-
ulation format, it will display the estimated bandwidth of the signal.
q
Set IA Freq — Set IA Freq is used to enter the center frequency of the in-
terfering signal to be identified. Enter the frequency using the Up/Down
arrow key or use the keypad and select the appropriate soft key for GHz,
MHz, kHz, or Hz.
q
Measure — Pressing the Measure soft key starts the signal identification
process. This process takes approximately one minute to complete. At the
end of the measurement process, a dialog box displays the results. The re
-
sults are also shown in the message area at the bottom of the display.
q
IA Freq to Center — The IA Freq to Center soft key moves the interfer
-
ence analysis frequency to the center of the screen.
q
IA Freq As Marker M1 — The IA Freq As Marker M1 soft key sets the in
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terference analysis frequency to be the frequency of marker M1. This is
the easiest way to enter the measurement frequency. Refer to the Marker
key section on the next page for information on setting the markers.
q
Back — Returns to the previous menu level.
q
Setup — Sets the parameters for IA measurements.
q
Bandwidth — Activates a menu that allows the resolution and video
bandwidths to be either coupled automatically to the span (Auto) or man
-
ually adjustable (Manual).
q
RBW Auto — Sets the resolution bandwidth so that it is automatically
coupled to the span.
q
RBW Manual — Sets the resolution bandwidth manually, independent
of the span, from 30 kHz to 1 MHz in zero span mode, 100 Hz to 1
MHz for a span greater than zero.
Chapter 2 Functions and Operations
2-49
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