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80
Figure 5-6 shows the test interface for opening all 4 markers and marker 1 opening the
△
mode.
2
Peak Search
By pressing [Peak] directly in the main menu area, user can set the current active marker to the highest
point of the measurement trace and display the frequency and amplitude of the marker in the upper
center of the screen. The [Peak] menu also provides the [Sub Peak] , [Right Peak] , [Left Peak] , [Max] ,
and [Min] soft keys for advanced marker search. The search function of [Peak] button is as follows:
a) Press [Sub Peak] to move the active marker to the next highest point on the trace that is associated
with the current marker position.
b) Press [Left Peak] to find the next peak to the left of the current marker position.
c) Press [Right Peak] to find the next peak to the right of the current marker position.
d) Press [Max] to place a marker at the highest point of the trace and display the frequency and
amplitude of the marker in the upper right corner of the screen. Pressing this button will not change
the activated functions.
NOTE:
If the signal waveform to be test change is relatively small or the
resolution bandwidth setting is large, the microwave analyzer will
consider that the signal has no peak value. To read the maximum
amplitude value of such a signal, Press
【
Mkr
】
, [Peak] ] , [Max] .
e) Press [Min] to place a marker at the lowest point of the trace and display the frequency and
amplitude of the marker in the upper right corner of the screen. Pressing this button will not change
the activated functions.
f)
Press [Mkr → Center Freq] and set the center frequency equal to the marker frequency. This
function quickly moves the signal to the center of the screen.
3
Noise Marker
The noise marker shows the noise power that normalizes the noise to the 1Hz bandwidth near the active
marker. At this time, the detector is set to the sample detection mode. The noise marker averages the
values of 32 data points near the frequency axis or time axis marker (including 16 data points on the left
side of the marker and 15 data points on the right side of the marker). If the noise marker is turned on,
the unit of the marker reading is automatically switched to dBm (1 Hz).
Steps for enabling the noise marker are as follow:
Press
【
Mkr
】
-> [Noise Mkr Off On].
Section 8 Optimization Measurement
This Section illustrates the typical applications of spectrum analyzer measurement techniques, each of
which addresses the different characteristics of the S5105D/E/F microwave analyzer. The section
introduces the following measurement methods and applications:
1. Apply resolution bandwidth to resolve signals with very close frequencies
2. Improve the accuracy of frequency measurement
3. Small signal measurement
4. Noise signal measurement
5. Field strength measurement
6. Power measurement
7. Occupied bandwidth measurement
8. Adjacent channel power ratio measurement
9. AM and FM signal demodulation
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