Agilent Technologies DP235 Guide de l'utilisateur télécharger pdf (Page 167)

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Using the Oscilloscope

The Scope Trigger Menu

Level field

The Level field shows the voltage value of the trigger level. When the

voltage value on the trigger source input waveform equals the trigger

level voltage value, the oscilloscope triggers.

When you change the trigger level voltage value, the waveform moves

horizontally on the display to maintain the trigger point. (That is, the

point where the waveform voltage value crosses the trigger point

voltage value.)

If the trigger point voltage level is set above or below the waveform

amplitude, the trigger point cannot be found. If Auto-Trig is set to On,

this causes the waveform display to become unsynchronized and to

"float" on the display. If Auto-Trig is set to Off, the message "Waiting for

trigger" is displayed.

The trigger point voltage can be set either by the autoscale function or

by a voltage value set into the Level field. It can be set to any voltage

value contained within the waveform display window, in increments of

0.05% of full scale vertical voltage range (V/Div x 4 divisions = full

scale). For example, if full scale voltage range were 400 mV, trigger

level would be set in increments of 2 mV (V/Div = 100 mV x 4 x 0.005 =

2 mV). Values entered that are not in this range will be rounded to the

nearest 0.05% increment.

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Agilent Technologies DP235 Guide de l'utilisateur Page 167

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