HP 8591C User Manual page 270

System CSO
3.
This test is performed on the channel specified using the
SYS BTS TST CHML softkey in the Setup menu. This applies to the system
measurements mode.
The system CSO test measures the beat product at an offset from the test
channel set by CSO FREQ OFFSET The default for CSO FBECj OFFSET
is 4.75 MHz. This can be set to +7.25 when measuring higher channel
numbers. Figure 8-5 shows the analyzer measuring the level of the beat
product and noise level for CSO beat products.
With this method of measuring CSO, a preamplifier is not generally needed
for accurate testing.
1993
GTPOS
LOG
56.768 MHz
WRES BW 38 kHz
Figure 8-5. Determining the level of the Beat Product and Noise Level
Composite Second Order (CSOI Test Description
MKR 54.888
-33.83
:
SPAN 6.888 MHz
6.98
Test Descriptions
RT
8-17