Agilent Technologies 54503A User's Guide download pdf (Page 223)

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Chapter 4 223

Key Function Descriptions

Key Descriptions

Front-panel key access: FREQUENCY

CF STEP AUTO MAN Adjusts the center-frequency step-size. When this

function is in coupled (AUTO) mode and center

frequency is the active function, pressing a step key

yields a one-division shift (10 percent of span) in the

center frequency for spans greater than 0 Hz. For zero

span, pressing a step key when center frequency is the

active function yields a center-frequency shift equal to

25 percent of the resolution bandwidth. For manual

(MAN) mode, the step size can be adjusted using the

data keys, the step keys, or the knob. After entering a

step size and changing the active function to CENTER

FREQ, use the step keys to adjust the center frequency

by the step size selected. This function is useful for

quickly tuning to the harmonics of an input signal. For

example, to tune to the harmonics of a 300 MHz signal,

set CF STEP AUTO MAN to MAN and enter 300 MHz.

If the center frequency is at 300 MHz, pressing the step

key increases the center frequency to 600 MHz, which

is equal to the second harmonic. Pressing the STEP key

again increases the center frequency by another 300

MHz, to 900 MHz. CF STEP AUTO MAN indicates

whether the step size is in a coupled (AUTO) or manual

(MAN) mode. When the step size is in manual mode,

pressing CF STEP AUTO MAN returns the function to

coupled mode.

Front-panel key access:

AUTO COUPLE or FREQUENCY

CH EDGES→∆MKR Moves the marker locations to ±0.5 channel

spacings from the center frequency. This allows power

measurements within a channel with the ∆MARKER

OCC BW softkey while multiple channels are shown in

the displayed frequency span.

Front-panel key access:

MEAS/USER

CHAN PWR OVER BW Calculates the power and power spectral density

in the channel power bandwidth speciﬁed by the

CHPWR BW [ ] softkey, and centered around the

spectrum analyzer center frequency. The center

frequency, reference level, and channel power

bandwidth must be set by the user.

Front-panel key access:

MEAS/USER

CHAN DN Moves the center frequency of the spectrum analyzer

lower in frequency by one channel spacing.

Front-panel key access: MEAS/USER

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