HP 8591C Manual do Utilizador descarregar pdf (Página 179)

100

101

Comparing

Signals

Using

Delta

Markers

Using the spectrum analyzer, you can easily compare frequency and

amplitude differences between signals, such as radio or television signal

spectra. The spectrum analyzer’s delta marker function lets you compare

two signals when both appear on the screen at one time or when only one

appears on the screen.

Example: Measure the differences between two signals on the same display

screen.

1. Connect the spectrum analyzer’s CAL OUT to the

INPUT

Press

(FEE-).

The calibration signal and its harmonics appear on the display.

2. Press (PEAK SEARCH] to place a marker at the highest peak on the display.

The NEXT PK RIGHT and NEXT PK LEFT softkeys move the marker from

peak to peak. Press NEXT PK RIGHT to move the marker to the 300 MHz

calibration signal. See Figure

11.

The signal that appears at the left edge of the screen is the spectrum

analyzer’s local oscillator (LO) and represents 0 Hz.

REF

dRrn”

28.45

dBrn”

PEAK

LOG

dB/

RIGHT

Figure

4-11.

Placing a Marker on the CAL OUT Signal

4-18

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