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Using Features for Advanced Applications
3–210
TDS 500C, TDS 600B, & TDS 700C User Manual
Rectangular Window
0 dB
-20
-40
-50
Hanning Window
0 dB
-20
-40
-60
-80
Hamming Window
0 dB
-20
-40
-60
Blackman-Harris Window
0 dB
-20
-40
-60
-80
-100
-101
FFT Window Type Bandpass Filter
0.89
–3 dB Bandwidth Highest Side Lobe
1.28
1.28
1.28
–13 dB
–32 dB
–43 dB
–94 dB
Figure 3–100: FFT Windows and Bandpass Characteristics
Waveform Differentiation
The Advanced DSP Math capabilities of the TDS Oscilloscope include
waveform differentiation. This capability allows you to display a derivative math
waveform that indicates the instantaneous rate of change of the waveform
acquired. This section describes how to setup the oscilloscope to display and
measure derivative math waveforms.
Derivative waveforms are used in the measurement of slew rate of amplifiers and
in educational applications. You can store and display a derivative math
waveform in a reference memory, then use it as a source for another derivative
waveform. The result is the second derivative of the waveform that was first
differentiated.