Agilent Technologies 54657A Guía de usuario descargar pdf (Pagina 37)

To make phase measurements automatically

Phase shift between two signals can be measured using the Lissajous method.

Refer to the User and Service Guide for your oscilloscope for more

information.

With the Measurement/Storage Module installed, phase is automatically

measured and displayed. Measurement is made from the rising edge of the

first full cycle on the input 1 signal, to the rising edge of the first full cycle on

the input 2 signal. The method used to determine phase is to measure delay

and period, then calculate phase as follows:

Phase =

delay

period of input 1

x 360

Adjust controls so that a minimum of one full cycle of the signal

connected to input 1 is displayed.

2 Press Time .

3 Press the Next Menu softkey until the Define Thresholds softkey is

displayed on the far left side.

4 Press the Measure Phase softkey. Phase is measured and displayed on

the screen.

Negative phase values indicate the displayed signal on channel 2 is leading

the signal on channel 1.

Automatic Phase Measurement Hints

If one full cycle of the signal connected to input 1 is not displayed, phase will not

be measured.

User thresholds has no effect on automatic phase measurements. Phase is

always measured at the 50% transition point (threshold level).

When using the delayed timebase, the instrument will attempt to perform the

measurement using the delayed window. If the selected channel 1 edge,

channel 2 edge, and channel 1 period cannot be found in the delayed window,

the main window is used. See "Time Measurements" in the User and Service

Guide for your oscilloscope for more information.

Operating the Measurement/Storage Module

To make phase measurements automatically

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Agilent Technologies 54657A Guía de usuario Pagina 37