Agilent Technologies N2781A Guía de usuario descargar pdf (Pagina 120)

120 Agilent InfiniiVision 2000 X-Series Oscilloscopes User's Guide

9 Triggers

• For digital channels, press the [Digital] key and select Thresholds to set

the threshold level.

The value of the trigger level or digital threshold is displayed in the

upper- right corner of the display.

5 Press the pulse polarity softkey to select positive ( ) or negative ( )

polarity for the pulse width you want to capture.

The selected pulse polarity is displayed in the upper- right corner of the

display. A positive pulse is higher than the current trigger level or

threshold and a negative pulse is lower than the current trigger level or

threshold.

When triggering on a positive pulse, the trigger will occur on the high

to low transition of the pulse if the qualifying condition is true. When

triggering on a negative pulse, the trigger will occur on the low to high

transition of the pulse if the qualifying condition is true.

6 Press the qualifier softkey (< > ><) to select the time qualifier.

The Qualifier softkey can set the oscilloscope to trigger on a pulse

width that is:

• Less than a time value (<).

For example, for a positive pulse, if you set t<10 ns:

• Greater than a time value (>).

For example, for a positive pulse, if you set t>10 ns:

• Within a range of time values (><).

For example, for a positive pulse, if you set t>10 ns and t<15 ns:

10 ns

Trigger

10 ns

Trigger

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Agilent Technologies N2781A Guía de usuario Pagina 120