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3 Spectrum Analyzer Mode

3.2 Swept SA Measurement

Note that because the above couplings depend on which traces are active, they are

re-examined whenever any trace goes active or inactive, except when this leaves no

traces active. Transitioning to the state where no traces are active should not affect

the couplings; in that way, the annotation will always reflect the state of the last

trace which was active.

Not also that some detectors are not available in some measurements, but because

of the way the above rules that does not change the logic of the rules.

Span:3dB RBW

Selects the ratio between "Span" on page 287 and "Res BW" on page 247.

Normally, Span:3dB RBW (Auto) selects a Span: 3dB Res BW ratio of 106:1. If you

manually enter the ratio, the toggle on Span:3dB RBW changes to Man. This

enables you to manually select ratios more suitable for certain measurements.

When Span:3dB RBW is manually selected, it may be returned to the coupled state

by setting the toggle on RBW:3dB RBW back to Auto. This may also be done by

pressing "Auto Couple" on page 2017, or by performing a Preset.

Remote Command

[:SENSe]:FREQuency:SPAN:BANDwidth[:RESolution]:RATio <integer>

[:SENSe]:FREQuency:SPAN:BANDwidth[:RESolution]:RATio?

Example Set a ratio of 200:1, and turn off Auto coupling:

:FREQ:SPAN:BAND:RAT 200

Notes The values shown in this table reflect the conditions after Mode Preset

Dependencies In the Swept SA measurement, this is grayed-out when the EMC Standard is set to CISPR or MIL,

since Res BW is coupled to Center Frequency rather than Span in this case

If the SCPI command is sent, the command is acted upon, but does not affect the current

measurement

Preset 106

State Saved Saved in instrument state

Min 2

Max 10000

Auto Function

Remote

Command

[:SENSe]:FREQuency:SPAN:BANDwidth[:RESolution]:RATio:AUTO OFF | ON | 0 | 1

[:SENSe]:FREQuency:SPAN:BANDwidth[:RESolution]:RATio:AUTO?

Example

:FREQ:SPAN:BAND:RAT:AUTO ON

:FREQ:SPAN:BAND:RAT:AUTO?

Spectrum Analyzer Mode User's &Programmer's Reference 253

Keysight x-series User Manual

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