User`s guide

Figure 2-5 demonstrates the relationship between center frequency and reference level. The

box in the figure represents the spectrum analyzer screen. Changing the center frequency

changes the horizontal placement of the signal on the screen. Changing the reference level

changes the vertical placement of the signal on the screen. Increasing the span increases the

frequency range that appears horizontally on the screen.

Note

Spectrum analyzers with Option 001 or 011 display the amplitude values in

dBmV.

Options 001 and 011 are available only for an HP

85901,

or HP 8591E.

f-U

REFERENCE

~FREWENC

LEVEL

AMP1

ii/DE

Figure 2-5. Relationship between Frequency and Amplitude

7. Set the marker.

You can place a diamond-shaped marker on the signal peak to find the signal’s frequency

and amplitude.

To activate a marker, press the

key (located in the MARKER section of the front

panel). The MARKER NORMAL label appears in inverse video to show that the marker is the

active function. Turn the knob to place the marker at the signal peak.

You can also use the

[PEAK

SEARCH]

key, which automatically places a marker at the highest

point on the trace.

Readouts of marker amplitude and frequency appear in the active function block and in the

upper-right corner of the display. Look at the marker readout to determine the amplitude of

the signal.

If another function is activated, the frequency and amplitude can still be identified by

looking at the marker readout in the upper-right corner of the screen.

2-14 Getting Started