Rohde & Schwarz FSV3000, Руководство пользователя

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Measurements and results
R&S
®
FSVA3000/ R&S
®
FSV3000
315 User Manual 1178.8520.02 ─ 08
Figure 5-53: Intermodulation-free dynamic range as a function of level at the input mixer and of the
selected resolution bandwidth
(Useful signal offset = 10 to 100 kHz, DANL = -145 dBm/Hz, TOI = 15 dBm; typical val-
ues at 2 GHz).
If the intermodulation products of a DUT with a very high dynamic range are to be
measured and the resolution bandwidth to be used is therefore very small, it is best to
measure the levels of the useful signals and those of the intermodulation products sep-
arately using a small span. The measurement time will be reduced, in particular if the
offset of the useful signals is large. To find signals reliably when frequency span is
small, it is best to synchronize the signal sources and the R&S
FSV/A.
5.11.3 TOI results
As a result of the TOI measurement, the following values are displayed in the marker
area of the diagram:
Label Description
TOI Third-order intercept point for averaged levels (s. also Chapter 5.11.3, "TOI results" ,
on page 315 and Figure 5-50 ):
P
U-AVG
+ (P
U-AVG
-P
S-AVG
)/2
TOI (max) P
U-MAX
+ (P
U-MAX
-P
S-MIN
)/2
TOI (min) P
U-MIN
+ (P
U-MIN
-P
S-MAX
)/2
M1 Maximum of first useful signal
M2 Maximum of second useful signal
M3 First intermodulation product
M4 Second intermodulation product
Third order intercept (TOI) measurement