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4.Advanced User Guidebook
Digital Filter
Digital filter provides 4 types of filters (low pass, high pass, band pass and band reject).
The specified frequencies can be filtered by setting the cut-off frequency.
1. Press the Math button to display the math menu in the bottom.
2. Select DIR in the bottom menu.
3. In the right menu, select channel as CH1 or CH2.
4. In the right menu, select type, select the desired filter type.
5. In the right menu, select window, select the desired window.
6. When low-pass or high-pass type is selected, select cut-off fre in the right menu.
When band-pass or band-reject type is selected, select upper or down in the right
menu. Turn M knob to adjust the frequency.
7. In the right menu, select Vertical (div), turn M knob to adjust the vertical position of
Math waveform. The voltage division of Math waveform is the same as the selected
channel.
Note: On the Scan format, digital filter is disabled.
Using FFT function
The FFT (fast Fourier transform) math function mathematically converts a time-domain
waveform into its frequency components. It is very useful for analyzing the input signal on
Oscilloscope. You can match these frequencies with known system frequencies, such as
system clocks, oscillators, or power supplies.
FFT function in this oscilloscope transforms 8192 data points of the time-domain signal
into its frequency components mathematically (the record length should be 10K or above).
The final frequency contains 4096 points ranging from 0Hz to Nyquist frequency.
Taking the FFT operation for example, the operation steps are as follows:
1. Press the Math button to display the math menu in the bottom.
2. Select FFT in the bottom menu.
3. In the right menu, select Source as CH1.
4. In the right menu, select Window. In the left menu, turn the M knob to select the
proper window type.
5. In the right menu, select Format. In the left menu, turn the M knob to select
amplitude unit (V RMS, Decibels) or phase unit (Radian, Degrees).
6. Select Hori (Hz) in the right menu; select repeatedly to make the symbol in front
of the horizontal position value (the upper one), turn the M knob to adjust the
horizontal position of FFT waveform; then select to make the symbol in front of
the time base value below, turn the M knob to adjust the time base of FFT waveform.
7. Select Vertical in the right menu; do the same operations as above to set the vertical
position and vertical division.
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