Agilent Technologies 54657A Guide de l'utilisateur télécharger pdf (Page 47)

To create a mask template using Autostore

An envelope of the passing region can be generated using the Autostore

function. Then the Automask function can read the Autostore screen

information and take the maximum and minimum limits of it as the limit lines

of the mask template. This process allows you to create a mask template

from a known good signal, allowing certain tolerance margins.

Connect a known good signal to the oscilloscope.

2 Set up the oscilloscope with the settings that are required to test the

signal.

3 Press Display , then toggle the Grid softkey to the None

position.

4 Press Autostore .

Make sure that STORE is displayed in the status line. If STORE is not

displayed, press Autostore again.

Set the voltage tolerance by moving the waveform up and down with

the vertical position knob, creating a vertical envelope.

6 Set the time tolerance by moving the waveform back and forth with

the horizontal delay knob, creating a horizontal envelope.

You may need to repeat steps 5 and 6 to fine tune the envelope. Cursors can

be used to accurately measure the margins.

An alternative method is to vary the input signal amplitude (level) and

frequency (time) by the desired amount.

Press

± .

8 Press the Mask Test softkey.

9 Press the Use Mask softkey to select the desired mask number (1 or 2).

10 Press the Define Mask Automask softkey.

Operating the Measurement/Storage Module

To create a mask template using Autostore

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Agilent Technologies 54657A Guide de l'utilisateur Page 47