7-3
IM 701510-01E
Changing
Acquisition and Display Conditions
7
7.2
Setting the Input Filter
1.
Press the
FILTER key
to display the input filter setting menu.
Applying the bandwidth limit
2.
Press the “
20 MHz
” soft key to apply the bandwidth limit. To cancel
the bandwidth limit, select “
FULL
”.
Applying the smoothing function
2.
After step 1 has been completed, press the “
Smoothing
” soft key and
select “
ON
”. To stop smoothing, select “
OFF
”.
Explanation
Bandwidth limit
The bandwidth frequency limit can be “20MHz”. The frequency characteristic when the
bandwidth limit is applied is shown below. When “FULL” is selected, the frequency
bandwidth is 150 MHz.
-3 dB
20 MHz
FULL(150 MHz)
Smoothing process
A moving average value is obtained for each five points of sampling data and the data
obtained is used when displaying the waveform. This process is performed on the data in the
acquisition memory, so it can still continue even if acquisition is stopped.
The following frequency characteristic of the smoothing process is dependent on the sample
rate. The attenuation rate will be –3 dB when the frequency is approximately 13% of the
sample rate. When the acquisition mode is envelope mode, this process cannot be carried
out.
f
0.5f
0.13f
Frequency
0 dB
-3 dB
f : Sample frequency
Attenuation
Keys and Procedure
FILTER key
Rotary knob
Soft keys
