Agilent InfiniiVision 2000 X-Series Oscilloscopes User's Guide

Triggers 9The trigger level for a selected digital channel is set using the thresholdmenu in the Digital Channel Menu. Press the [Digital] key on the frontpanel, then press the Thresholds softkey to set the threshold level (TTL,CMOS, ECL, or user defined) for the selected digital channel group. Thethreshold value is displayed in the upper- right corner of the display.The line trigger level is not adjustable. This trigger is synchronized withthe power line supplied to the oscilloscope.NOTEYou can also change the trigger level of all channels by pressing [Analyze] > Features andthen selecting Trigger Levels.Forcing a TriggerThe [Force Trigger] key causes a trigger (on anything) and displays theacquisition.This key is useful in the Normal trigger mode where acquisitions are madeonly when the trigger condition is met. In this mode, if no triggers areoccurring (that is, the "Trig'd?" indicator is displayed), you can press [ForceTrigger] to force a trigger and see what the input signals look like.In the Auto trigger mode, when the trigger condition is not met, triggersare forced and the "Auto?" indicator is displayed.Edge TriggerThe Edge trigger type identifies a trigger by looking for a specified edge(slope) and voltage level on a waveform. You can define the trigger sourceand slope in this menu. The slope can be set to rising edge or falling edge,and can be set to alternating edges or either edge on all sources exceptLine. The trigger type, source, and level are displayed in the upper- rightcorner of the display.1 On the front panel, in the Trigger section, press the [Trigger] key.2 In the Trigger Menu, press the Trigger softkey, and use the Entry knobto select Edge.3 Select the trigger source:Agilent InfiniiVision 2000 X-Series Oscilloscopes User's Guide 113