:FFT Commands 17
Keysight InfiniiVision 3000T X-Series Oscilloscopes Programmer's Guide 351
:FFT:DMODe
(see page 1276)
Command Syntax
:FFT:DMODe <display_mode>
<display_mode> ::= {NORMal | AVERage | MAXHold | MINHold}
The :FFT:DMODe command selects one of the FFT waveform display modes:
• NORMal — this is the FFT waveform without any averaging or hold functions
applied. This is how FFT math function waveforms are displayed.
• AVERage — the FFT waveform is averaged the selected number of times.
Averages are calculated using a "decaying average" approximation, where:
next_average = current_average + (new_data - current_average)/N
Where N starts at 1 for the first acquisition and increments for each following
acquisition until it reaches the selected number of averages, where it holds.
• MAXHold — records the maximum vertical values found at each horizontal
bucket across multiple analysis cycles and uses those values to build a
waveform. This display mode is often referred to as Max Envelope.
• MINHold — records the minimum vertical values found at each horizontal
bucket across multiple analysis cycles and uses those values to build a
waveform. This display mode is often referred to as Min Envelope.
Query Syntax
:FFT:DMODe?
The :FFT:DMODe? query returns the currently set FFT display mode.
Return Format
<display_mode><NL>
<display_mode> ::= {NORM | AVER | MAXH | MINH}
See Also • ":FFT:AVERage:COUNt" on page 347
• ":FFT:CENTer" on page 348
• ":FFT:CLEar" on page 349
• ":FFT:DISPlay" on page 350
• ":FFT:OFFSet" on page 353
• ":FFT:RANGe" on page 354
• ":FFT:REFerence" on page 355
• ":FFT:SCALe" on page 356
• ":FFT:SOURce1" on page 357
• ":FFT:SPAN" on page 358
• ":FFT:STARt" on page 359
• ":FFT:STOP" on page 360
• ":FFT:VTYPe" on page 361
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