User`s guide

4 Triggering

86 InfiniiVision Oscilloscopes User’s Guide

pre-trigger buffer, the trigger will not be found. If you use Normal mode and wait for the

trigger condition indicator to flash before causing the action in the circuit, the

oscilloscope will always find the trigger condition.

Some measurements you want to make will require you to take some action in the device

under test to cause the trigger event. Usually, these are single-shot acquisitions, where

you will use the [Single] key.

Trigger Level Adjustment

You can adjust the trigger level for a selected analog channel by turning the Trigger Level

knob. The position of the trigger level for the analog channel is indicated by the trigger

level icon (if the analog channel is on) at the far left side of the display when DC

coupling is selected. The value of the analog channel trigger level is displayed in the

upper-right corner of the display.

The trigger level for a selected digital channel is set using the threshold menu in the

Digital Channel Menu. Press the [D15-D0] key on the front panel, then press the

Thresholds softkey to set the threshold level (TTL, CMOS, ECL, or user defined) for the

selected digital channel group. The threshold value is displayed in the upper-right corner

of the display.

The line trigger level is not adjustable. This trigger is synchronized with the power line

supplied to the oscilloscope.