Rigol DS2000E Series - Page 77

2 Command System RIGOL
DS2000E Programming Guide
2-61
:CALCulate:FFT:HSCale
Syntax
:CALCulate:FFT:HSCale <hscale>
:CALCulate:FFT:HSCale?
Description
Set or query the horizontal coefficient of FFT operation. This command indirectly sets the horizontal scale
of FFT operation.
Parameter
Name Type Range Default
<hscale> Discrete {1|2|3|4} 2
Note: You can use the :CALCulate:FFT:HSPan command to set the horizontal scale of FFT operation directly.
Explanation
 The FFT horizontal coefficient represents the relationship between the FFT horizontal scale (Hspan)
and the current FFT sample rate of the screen (Sa).
1: Hspan=Sa/20
2: Hspan=Sa/40
3: Hspan=Sa/100
4: Hspan=Sa/200
 The current FFT sample rate of the screen=the number of pixels per grid horizontally/the horizontal
timebase. The number of pixels per grid horizontally is related to the on/off status of the
aunti-aliasing function; it is 50 when the anti-aliasing function is disabled and 100 when the
anti-aliasing function is enabled. For the horizontal timebase, refer to the
:TIMebase[:MAIN]:SCALe
command.
Return Format
The query returns 1, 2, 3, or 4.