RIGOL
DS4000E Programming Guide
2-47
is 100. For the value of Horizontal Time Base, refer to the :TIMebase[:MAIN]:SCALe command.
The FFT horizontal scale is related to the FFT sample rate and FFT horizontal coefficient, refer to
the :CALCulate:FFT:HSPan command.
Return Format
The query returns the horizontal position in scientific notation.
:CALCulate:FFT:HSCaLe
Syntax
:CALCulate:FFT:HSCale <hscale>
:CALCulate:FFT:HSCale?
Description
Sets or queries the horizontal coefficient of FFT operation.
Parameter
Name
Type
Range
Default
<hscale>
Discrete
{1|2|3|4}
2
Remarks
This command indirectly sets the horizontal scale of FFT operation (refer to the :CALCulate:FFT:HSPan
command). Different FFT horizontal coefficients represent different relationships between the FFT
horizontal scale (Hspan) and FFT sample rate (Sa), as shown below.
1: Hspan = Sa/20
2: Hspan = Sa/40
3: Hspan = Sa/100
4: Hspan = Sa/200
FFT Sample Rate = Number of Pixels Per Grid Horizontally/Horizontal Time Base
Wherein, Number of Pixels Per Grid Horizontally is related to the on/off status of FFT anti-aliasing
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.
Return Format
The query returns 1, 2, 3, or 4.
:CALCulate:FFT:HSPan
Syntax
:CALCulate:FFT:HSPan <span>
:CALCulate:FFT:HSPan?
Description
Sets or queries the horizontal scale (namely the frequency value per grid horizontally) of the FFT operation
waveform. The default unit is Hz/div.
Parameter
Name
Type
Range
Default
<span>
Real
Refer to Remarks
1.25 MHz/div
Remarks
The FFT horizontal scale is related to the current FFT sample rate (Sa), and it can be Sa/20, Sa/40,
Sa/100, or Sa/200.
FFT Sample Rate = Number of Pixels Per Grid Horizontally/Horizontal Time Base
Wherein, Number of Pixels Per Grid Horizontally is related to the on/off status of FFT anti-aliasing
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