Making Measurements Using Spectrum Analyzer Mode

Stimulus-Response Measurements

4.Put the sweep time of the analyzer into stimulus-response auto-coupled mode by pressing More I of 2 , then SWP CPLG SR SA until SR (stimulus-response mode) is underlined. Auto-coupled sweep times are usually much faster for swept-response measurements than they are for spectrum analyzer measurements.

N O T E

In the stimulus-response mode, the II (reactance versus resistance) of the OUT can determine the fastest rate at which the spectrum analyzer can be swept. To determine whether the analyzer is sweeping too fast, slow the sweep time and note whether there is a frequency or amplitude shift of the trace. Continue to slow the sweep time until there is no longer a frequency or amplitude shift.

I

4

REF 48.8

<lBmV

AT 10

dB

 

 

 

 

 

 

 

 

 

PEAK /

/

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

SPAN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

I500

0

MHz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FULL

 

 

 

 

 

 

 

 

 

 

 

 

 

u

\

I

 

 

 

 

 

 

 

SPQN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ZERO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SPAN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LAST

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SPAN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

:ENTER

350 .O

MHz

 

 

 

 

 

 

 

 

SPAN

500.0

MHz

#RES

BW

3.0

 

MHz

 

VBW 1 MHz

 

 

SWP

20.0

msec

Figure 5-6. Spectrum Analyzer Settings According to the Measurement Requirement

5-17