Triggers 10Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide 127The trigger level for a selected digital channel is set using the threshold menu inthe Digital Channel Menu. Press the [Digital] key on the front panel, then press theThresholds softkey to set the threshold level (TTL, CMOS, ECL, or user defined) forthe selected digital channel group. The threshold value is displayed in theupper-right corner of the display.The line trigger level is not adjustable. This trigger is synchronized with the powerline supplied to the oscilloscope.Forcing a TriggerThe [Force Trigger] key causes a trigger (on anything) and displays the acquisition.This key is useful in the Normal trigger mode where acquisitions are made onlywhen the trigger condition is met. In this mode, if no triggers are occurring (that is,the "Trig'd?" indicator is displayed), you can press [Force Trigger] to force a triggerand see what the input signals look like.In the Auto trigger mode, when the trigger condition is not met, triggers are forcedand 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 source and slope inthis menu. The trigger type, source, and level (if applicable) are displayed in theupper-right corner 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 knob to selectEdge.3 Select the trigger source:• Analog channel, 1 to the number of channelsNOTE You can also change the trigger level of all channels by pressing [Analyze] > Features andthen selecting Trigger Levels.
