Rigol DS1104B Guia do Utilizador descarregar pdf (Página 140)

RIGOL

User’s Guide for DS1000B Series

3-4

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 Signal with noises

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 Press Set Up→HF Reject→ON.

HF Reject (High frequency rejects) 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 rejects) 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.

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Rigol DS1104B Guia do Utilizador Página 140