Operating Manual EMI TEST RECEIVER ESIB7 - Rohde & Schwarz

ESIB
Receiver - Search Functions
The peak excursion is preset to 6 dB. This is sufficient for the functions NEXT
PEAK (or NEXT MIN) as the next smallest (or highest) signal is always
searched four.
Functions NEXT PEAK LEFT and NEXT PEAK RIGHT (or NEXT MIN LEFT
and NEXT MIN RIGHT) search for the next relative maximum (or minimum)
irrespective of the current signal amplitude.
As for wide bandwidths, the set 6-dB level change is already reached by the
noise indication of the receiver, the noise values are also identified as peak. In
this case, a value for PEAK EXCURSION which is greater than the difference
between the maximum and minimum noise display reading must be entered.
The following example shows the effect of different PEAK EXCURSION
settings.
0
-10
-20
Marker [T1]
199.0140 MHz
-22.4 dBm
1
1
2
4
-30
3
-40
-50
42dB
30dB
46dB
-60
-70
-80
-90
-100
Fig. 4-9 Example: level measurements at various peak excursion settings
Maximum relative level change of the measured signals:
Signal 2: 42dB
Signal 3 30dB
Signal 4: 46dB
With Peak Excursion 40dB signal 2 and 4 are detected by NEXT PEAK or
NEXT PEAK RIGHT. Signal 3 is not detected since it is only decreased by 30
dB before rising again.
Order in which signals are found:
PEAK: Signal 1 or PEAK: Signal 1
NEXT PEAK: Signal 2 NEXT PEAK RIGHT: Signal 2
NEXT PEAK: Signal 4 NEXT PEAK RIGHT: Signal 4
1088.7531.12 4.131 E-15