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Digital Oscilloscope Series
91
MATH
FFT_SCALE | FFTS
Command /Query
DESCRIPTION
The FFT_SCALE command sets the vertical
scale of FFT waveform. The unit is related to the
vertical scale type of the current FFT and the
unit of the channel.
The FFT_SCALE? query returns the current
vertical scale of FFT waveform.
COMMAND SYNTAX
FFT_SCALE <scale>
<scale>:={0.1,0.2,0.5,1,2,5,10,20} when scale
type is dBVrms or dBm.
<scale>:={0.001,0.002,0.005,0.01,0.02,0.05,0.1,
0. 2,0.5,1, 2,5,10,20} when scale type is Vrms.
QUERY SYNTAX
FFT_SCALE?
RESPONSE FORMAT
FFT_SCALE <scale>
<scale>:= Numerical value in E-notation with
SI unit.
EXAMPLE
• When the Math function is on, and the
operator is FFT, the following steps set the
vertical scale of FFT to 5 dBVrms.
Step 1: Send command to set the scale unit to
dBVrms.
Command message:
FFTU DBVRMS
Step 2: Send command to set the scale to 5.
Command message:
FFTS 5
• When the Math function is on, and the
operator is FFT, the following steps set the
vertical scale of FFT to 100 mVrms.
Step 1: Send command to set the scale unit to
Vrms.
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