HP Cable Box 8591C manual Decrease the Resolution Bandwidth to Improve Sensitivity

Making Measurements Using Spectrum Analyzer Mode

Stimulus-Response Measurements

5.Since we are only interested in the rejection of the low-pass Iilter, tune the spectrum analyzer’s center frequency so that the roll-off of the filter comprises the majority of the trace on the display (see Figure 5-6).

6.Decrease the resolution bandwidth to increase sensitivity, and narrow the video bandwidth to smooth the noise. In Figure 5-7, the resolution bandwidth has been decreased to 10 kHz.

REF

48.8

dBmV

AT

10 dB

PES

PEAK

AUTO

ML\N

LOG

10

“IO

BW

dB/

a MAN

VBW/RBW

RATIO

VI0

AVG

ON

02

WA

SB

\

SC

FC

CORR

\

‘4

EM1

BW

W”U

I

CENTER 350 .O

MHZ

SPAN

500.0

MHz

#RES

BW

10

kHr

VBW 10 kHz

SWP

15.0

set

Figure 5.7. Decrease the Resolution Bandwidth to Improve Sensitivity

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