Rigol DS1000M Guide de l'utilisateur télécharger pdf (Page 140)

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3-4 © Copyright RIGOL Technologies, Inc. 2007.

User’s Guide for DS1000 Series

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 and avoid its interference to the

signal itself.

Figure 3-2

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 cutoff

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 cutoff

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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Rigol DS1000M Guide de l'utilisateur Page 140