
RIGOL
Example 4: To reduce the random noise on a signal
If the signal applied to the oscilloscope is noisy (Figure 3-2), you can set up the
oscilloscope to reduce the noise on the waveform. First, stabilize the displayed
waveform by removing the noise from the trigger path. Second, reduce the noise on
the displayed waveform.
Figure 3-2
1. Connect a signal to the oscilloscope and obtain a stable display.
2. Remove the noise from the trigger path by turning on
HF Reject
.
HF Reject
(High frequency reject) adds a low pass filter with the 3 dB point at
150 kHz. Use
HF reject
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 point at 8
kHz. Use
LF Reject
to remove low frequency signals such as power line noise
from the trigger path.
3. Use averaging to reduce noise on the displayed waveform.
Copyright 2004 Rigol Electronic
3-4
User Manual for DS5000 Series