HP 8591C User Manual page 293

The in-channel frequency response test sets the analyzer to view full-field test
signals such as multi-burst, sinX/X, or line sweep. In addition, it can view
an in-channel sweep signal. The sweep signal can either be continuously
or manually swept. Figure 8-16 is the result of manually sweeping a signal
generator across the measurement range.
Multi-burst is a popular signal but it has some limitations. Figure 8-17 shows
full-field FCC multi-burst.
Note that the 0.5 MHz burst packet cannot be resolved in a resolution
bandwidth of 300 kHz. However, 300 kHz is the minimum bandwidth
required for the analyzer to accurately measure burst packets greater than
4.25 ps.
If all the burst packets were the same time duration, a resolution bandwidth
of 100 kHz could be used. The burst height would not be accurate but they
all have the same relative amplitude.
CHANNEL gS (STO)
REF 31.3 dBmV
LOG
START 180.000
WRES EM 100 kHz
Figure E-16. In-Channel Frequency Response
JRN 1995
3
MKR 184.545 MHz
20.64
RESTRRT
MAX HOLD
CALC
FRQ RESP
STOP 186.000
T