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4 - 38 COMMAND REFERENCE
CALCulate<n>:TRANsform:FREQuency:STATe
CALCulate<n>:TRANsform:FREQuency:TYPE
CALCulate<n>:TRANsform:FREQuency:WINDow
Syntax:
CALCulate<n>:TRANsform:FREQuency:STATe <Boolean>
CALCulate<n>:TRANsform:FREQuency:TYPE ABSolute |
RELative
CALCulate<n>:TRANsform:FREQuency:WINDow RECTangular |
HAMMing | HANNing
<n> [1] | 2
Query form:
CALCulate<n>:TRANsform:FREQuency:STATe?
Response:
0 | 1
Query form:
CALCulate<n>:TRANsform:FREQuency:TYPE?
Response:
ABS | REL
Query form:
CALCulate<n>:TRANsform:FREQuency:WINDow?
Response:
RECT | HAMM | HANN
Description:
The CALCulate<n>:TRANsform:FREQuency:TYPE command selects between
RELative and ABSolute FFT calculation.
The CALCulate<n>:TRANsform:FREQuency:WINDow command defines the
window type that is used with the FFT function. The FFT RECTangular function
transforms a repetitive time amplitude trace into its power spectrum. Displayed is
the amplitude (vertical) versus the frequency (horizontal). The FFT HAMMing and
HANNing functions reduce the side lobes by applying a Hamming or Hanning
window to the input signal. This improves the visibility of the minor frequency
components if the MATH1/MATH2 - FFT - PARAM "limited area" function is not
accurately selected.
The result of the FFT function is stored in M1_1 for CALCulate1 and in M2_1 for
CALCulate2. After a
*
RST command, the FFT type is RELative, the FFT window
is RECTangular, and the FFT functions are switched OFF.