Agilent Technologies 54657A Especificaciones descargar pdf (Pagina 60)

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 noisy signal to the oscilloscope and press

Autoscale .

2 Obtain a stable display by removing the noise from trigger path;

press

Slope/Coupling , then select either the LF Reject softkey

or the

HF Reject softkey.

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.

HF reject (trigger path)

3 dB down point

Pass

Band

0 dB

50 kHz

Figure 2-19

Operating Your Oscilloscope

To reduce the random noise on a signal

2–30

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Agilent Technologies 54657A Especificaciones Pagina 60