294 6000 Series Oscilloscope User’s Guide
6 Displaying Data
To reduce the random noise on a signal
If the signal you are probing is noisy, you can set up the
oscilloscope to reduce the noise on the displayed waveform.
First, you stabilize the displayed waveform by removing the
noise from the trigger path. Second, you reduce the noise on the
displayed waveform.
1 Connect a signal to the oscilloscope and obtain a stable
display.
2 Remove the noise from the trigger path by turning on
high-frequency rejection (HF reject), low-frequency rejection
(LF reject), or noise rejection (see the following pages).
3 Use averaging (see page 261) to reduce noise on the displayed
waveform.
HF Reject
High-frequency reject (HF reject) adds a low-pass filter with the
3-dB point at 50 kHz. HF reject removes high-frequency noise,
such as AM or FM broadcast stations, from the trigger path.
• Press Mode/Coupling&HF Reject.
3 dB down point
Pass
Band
0 dB
DC 50 kHz
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