HP 8591C Instrukcja Użytkownika Pobierz pdf (Strona 165)

100

101

Making Basic Measurements Using Spectrum Analyzer Mode

Resolving Signals of Equal Amplitude Using the Resolution Bandwidth Function

Example: Resolve two signals of equal amplitude with a frequency separation

of 100

kHz.

CAL

OUT

COUPLER

Figure 4-1. Set-Up for Obtaining Two Signals

INPUT

pul17c

1. To obtain two signals with a 100

kHz

separation, connect the calibration

signal and a signal source to the spectrum analyzer input as shown in

Figure 4-1. (If available, two sources can be used.)

2. If you are using the 300 MHz calibration signal, set the frequency of the

source 100

kHz

greater than the calibration signal (that is, 300.1 MHz).

The amplitude of both signals should be approximately 29

dBmV.

3. On the spectrum analyzer, press

CPRESET].

Set the center frequency to

300 MHz, the span to 2 MHz, and the resolution bandwidth to 300

kHz

pressing

CFREQUENCY)

300

INIHz_),

2 (MHz), then

[Bw)

300

IkHz).

single signal peak is visible.

4. Since the resolution bandwidth must be less than or equal to the

frequency separation of the two signals, a resolution bandwidth of 100

kHz

must be used. Change the resolution bandwidth to 100

kHz

by pressing

lew]

100

(kHz.

Two signals are now visible as in Figure 4-2. Use the knob

or step keys to further reduce the resolution bandwidth and better resolve

the signals.

4-4

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