Agilent Technologies 11970 Series, Руководство пользователя

Страница: 33 / 78

Chapter 2 33
Operation
Using the Mixers with the 856X Series Spectrum Analyzers
O
p
er
ati
o
n
Figure 2-10 Store and correct for conversion loss.
The second method for storing conversion-loss information lets you save individual
conversion-loss data points at specific intervals across the harmonic band, using
CNV
LOSS VS FREQ
.
To view or enter a conversion-loss data point:
a. Press
CNV LOSS VS FREQ
.
b. Enter the conversion-loss data at the frequency shown.
c. Use the step up
⇑
key to step through the band, entering the conversion loss at each
step.
Signal Identification
5. The IF output of a harmonic mixer contains many mixer products (frequencies of LO
±
source, 2LO
±
source, 3LO
±
source…nLO
±
source). As a result, within a single
harmonic band, a single input signal can produce many responses, only one of which is
valid.
These responses come in pairs, where the members of the valid pair are spaced 621.4
MHz apart (see
Figure 2-11
) and the right-most member for the pair is the correct
response (for this analyzer, the left member of a pair is not valid).