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:MEASure Commands 24

Keysight InfiniiVision 4000 X-Series Oscilloscopes Programmer's Guide 593

:MEASure:FFT:OBW

(see page 1610)

Command Syntax

:MEASure:FFT:OBW <percentage>[,<source>]

<percentage> ::= percent of spectral power occupied bandwidth is

measured for (in NR3 format)

<source> ::= {FUNCtion<m> | MATH<m> | FFT} (must be an FFT waveform)

<m> ::= 1 to (# math functions) in NR1 format

The :MEASure:FFT:OBW command installs an FFT analysis Occupied Bandwidth

measurement on screen.

Occupied Bandwidth measures the bandwidth (frequency range) containing some

percent (usually 99%) of the total spectral power. While 99% is the industry norm,

you can specify the percent you want to use in the measurement.

The center frequency used in the measurement is the one defined for the FFT

function, and the FFT span represents the total spectral power.

When this measurement is tracked with cursors, the cursors show the measured

bandwidth (frequency range).

Query Syntax

:MEASure:FFT:OBW? <percentage>[,<source>]

The :MEASure:FFT:OBW? query returns the measured Occupied Bandwidth value.

Return Format

<return_value><NL>

<return_value> ::= occupied bandwidth, Hz in NR3 format

See Also • ":MEASure:FFT:ACPR" on page 591

• ":MEASure:FFT:CPOWer" on page 592

• ":MEASure:FFT:THD" on page 594

Keysight Technologies InfiniiVision 4000 X Series User Manual

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