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3 Spectrum Analyzer Mode

3.2 Swept SA Measurement

changes. When the user adjusts the Marker Noise Band Span, Band Span Auto/Man is set to Manual.

So, the legacy behavior is preserved, but now you can set the Marker Noise Span as well, and that

setting is preserved when Span is changed

N dB Points

Turns N dB points on or off, and lets you set the N dB value. N dB uses the selected

marker. If the selected marker is not on when N dB is turned on, the selected marker

turns on, as a Normal marker, at center screen, and is used by N dB.

See:

–

"N dB Points Results Queries" on page 356

–

"More Information" on page 358

Remote

Command

:CALCulate:BWIDth|BANDwidth:NDB <rel_ampl>

:CALCulate:BWIDth|BANDwidth:NDB?

Notes If the selected marker is turned Off, turns off N dB Points

N DB Points is unaffected by "Auto Couple" on page 2017

Preset –3.01dB

Off, –3.01 dB

State Saved The on/off status and the offset value are both saved in instrument state

Min –140 dB

Max –0.01 dB

Auto Function

Remote Command

:CALCulate:BWIDth|BANDwidth[:STATe] OFF | ON | 0 | 1

:CALCulate:BWIDth|BANDwidth[:STATe]?

Preset

OFF

N dB Points Results Queries

You can query the width of the N dB band as well as the right and left edges of the

band. For example, for the signal shown below, the marker is at 100 MHz and each

graticule division represents 200 kHz. The N dB value is -14.7 dB, and this makes

the width of the NdB band 400 kHz. The frequencies at the left and right edge of the

NdB band are as shown, 99.8 MHz and 100.2 MHz:

356 Spectrum Analyzer Mode User's &Programmer's Reference

Keysight x-series User Manual

Other manuals for Keysight x-series