4.Advanced User Guidebook
32
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.
Summary of Contents for Dual-Channel Series
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Page 29: ...3 Junior User Guidebook 22 Double Zoom Single Zoom ...
Page 42: ...4 Advanced User Guidebook 35 Figure 4 2 Rectangle window Figure 4 3 Blackman window ...
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