RIGOL
3-4 Copyright ©1998-2008 RIGOL Technologies, Inc.
User’s Guide for DS1000CA Series
Example 4: To Reduce the Random Noise on a Signal
If the signal is noisy (Figure 3-2), set up the oscilloscope to reduce the noise on the
waveform and avoid its interference to the signal.
Figure 3-2
Waveform display
1. Set the probe and the channel attenuations to 10X.
2. Connect a signal to the oscilloscope and obtain a stable display.
3. Improve the trigger by setting the Coupling
(1) Press the MENU in the Trigger control area.
(2) Press Set Up→Coupling→LF Reject or HF Reject
HF Reject (High frequency reject) adds a low pass filter with the -3 dB
cut-off point at 150 kHz. Use HF rejects to remove high frequency noise such
as AM or FM broadcast stations from the trigger path.
LF Reject (Low frequency reject) adds a high pass filter with the -3 dB
cut-off point at 8 kHz. Use LF Reject to remove low frequency signals such as
power line noise from the trigger path.
4. To reduce the noise by setting the acquisition type and adjust the waveform
intensity
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