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Keysight InfiniiVision M9241/42/43A PXIe Oscilloscopes SCPI Programmer's Guide
21
:MEASure Commands
:MEASure:FFT:THD
Command Syntax
:MEASure:FFT:THD <tracking>[,<fundamental_freq>][,<source>]
<tracking> ::= {AUTO | MANual}
<fundamental_freq> ::= in NR3 format, required if <tracking> is MANual
<source> ::= {FUNCtion<m> | MATH<m> | FFT} (must be an FFT waveform)
<m> ::= 1 to (# math functions) in NR1 format
The :MEASure:FFT:THD command installs an FFT analysis Total Harmonic
Distortion measurement on screen.
Total Harmonic Distortion (THD) is the ratio of power in the fundamental frequency
to the power contained in the rest of the harmonics and noise. THD is a measure of
signal purity.
Total Harmonic Distortion (THD) measures the power contained in the bands
surrounding each harmonic and compares it to the power in the band surrounding
the fundamental frequency. The width of the bands measured is the same for the
fundamental frequency and each harmonic. That width is 1/2 of the fundamental
frequency.
You can either enter the fundamental frequency as a measurement parameter and
have the fundamental frequency and harmonics be tracked manually, or you can
allow the fundamental frequency and harmonics to be tracked automatically,
where the highest peak is assumed to be the fundamental frequency.
When this measurement is tracked with cursors, the cursors show the band
surrounding the fundamental frequency that is being measured (at ±1/4 of the
fundamental frequency).
Query Syntax
:MEASure:FFT:THD? <tracking>[,<fundamental_freq>][,<source>]
The :MEASure:FFT:THD? query returns the measured Total Harmonic Distortion
value.
Return Format
<return_value><NL>
<return_value> ::= total harmonic distortion ratio percent in NR3 format
See Also
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Содержание InfiniiVision M9241A
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Страница 52: ...52 Keysight InfiniiVision M9241 42 43A PXIe Oscilloscopes SCPI Programmer s Guide 2 Setting Up ...
Страница 178: ...178 Keysight InfiniiVision M9241 42 43A PXIe Oscilloscopes SCPI Programmer s Guide 5 Commands Quick Reference ...
Страница 246: ...246 Keysight InfiniiVision M9241 42 43A PXIe Oscilloscopes SCPI Programmer s Guide 7 Root Commands ...
Страница 268: ...268 Keysight InfiniiVision M9241 42 43A PXIe Oscilloscopes SCPI Programmer s Guide 8 ACQuire Commands ...
Страница 280: ...280 Keysight InfiniiVision M9241 42 43A PXIe Oscilloscopes SCPI Programmer s Guide 9 CALibrate Commands ...
Страница 354: ...354 Keysight InfiniiVision M9241 42 43A PXIe Oscilloscopes SCPI Programmer s Guide 15 EXTernal Trigger Commands ...
Страница 412: ...412 Keysight InfiniiVision M9241 42 43A PXIe Oscilloscopes SCPI Programmer s Guide 17 FUNCtion m Commands ...
Страница 416: ...416 Keysight InfiniiVision M9241 42 43A PXIe Oscilloscopes SCPI Programmer s Guide 18 HCOPY Commands ...
Страница 442: ...442 Keysight InfiniiVision M9241 42 43A PXIe Oscilloscopes SCPI Programmer s Guide 20 MARKer Commands ...
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Страница 1376: ...1376 Keysight InfiniiVision M9241 42 43A PXIe Oscilloscopes SCPI Programmer s Guide 39 More About Oscilloscope Commands ...