Hewlett-Packard 8591C Manual

A SERVICE OF

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Making Basic Measurements Using Spectrum Analyzer Mode

Resolving Small Signals Hidden by large Signals Using the Resolution Bandwidth Function

If a 30

kHz

filter is used, the 60

dB

bandwidth will be 450

kHz.

Since the

half-bandwidth (225

kHz)

is wider than the frequency separation, the signals

most likely will not be resolved. See Figure 4-5. (To determine resolution

capability for intermediate values of amplitude level differences, consider the

hlter

skirts between the 3

dB

and 60

dB

points to be approximately straight.

In this case, we simply used the 60

dB

value.)

REF

PEAK

LOG

10

dB/

WA

St

SC

F(

COW

3

4

MKR

300.010

MHz

I

CENTER

SRES

300.000

EW

30

MHz

kHr

“SW

30

CHZ

SPAN

SWP

2

000

20

msec

MHZ

Figure 4-5. Signal Resolution with a 30

kHz

Resolution Bandwidth

4-8