To Reduce The Random Noise On A Signal - HP 54600B User's And Service Manual

Operating Your Oscilloscope

To reduce the random noise on a signal

To reduce the random noise on a signal
If the signal you are applying to the oscilloscope is noisy (figure 2-21), you
can set up the oscilloscope to reduce the noise on the waveform (figure
2-22). First, you stabilize the displayed waveform by removing the noise
from the trigger path. Second, you reduce the noise on the displayed
waveform.
Connect a signal to the oscilloscope and obtain a stable display.
1
Remove the noise from the trigger path by turning on either high
2
frequency reject or noise reject.
High frequency reject (HF reject) adds a low pass filter with the 3 dB point at
50 kHz (see figure 2-19). You use HF reject to remove high frequency noise
such as AM or FM broadcast stations from the trigger path.
Figure 2–19
0 dB
3 dB down point
dc
HF reject
2–28
Pass
Band
50 kHz