User manual

RIGOL Chapter 2 Command System
2-48 DS4000E Programming Guide
function. When the function is disabled, Number of Pixels Per Grid Horizontally is 50; when enabled, it
is 100. For the value of Horizontal Time Base, refer to the :TIMebase[:MAIN]:SCALe command.
 You can set the FFT horizontal scale indirectly by setting the FFT horizontal coefficient (refer to
the :CALCulate:FFT:HSCaLe command).
Return Format
The query returns the horizontal scale in scientific notation.
:CALCulate:FFT:SOURce
Syntax
:CALCulate:FFT:SOURce <source>
:CALCulate:FFT:SOURce?
Description
Sets or queries the source channel of FFT operation.
Parameter
Name Type Range Default
<source> Discrete {CHANnel1|CHANnel2|CHANnel3|CHANnel4} CHANnel1
Return Format
The query returns CHAN1, CHAN2, CHAN3, or CHAN4.
:CALCulate:FFT:SPLit
Syntax
:CALCulate:FFT:SPLit <bool>
:CALCulate:FFT:SPLit?
Description
Turns on or off the split display of FFT operation; or queries the on/off status of the split display of FFT
operation.
Parameter
Name
Type
Range
Default
<bool> Bool {{1|ON}|{0|OFF}} 1|ON
Remarks
 1|ON: turns on split display. The source channel waveform and FFT operation waveform are displayed
separately, with the time domain and frequency domain signals displayed clearly.
 0|OFF: turns off split display. The source channel waveform and FFT operation waveform are displayed
in the same window (namely full-screen display). You can observe the frequency spectrum more
clearly and make more accurate measurements.
Return Format
The query returns 1 or 0.