Fluke PM3370B user manual PRE-TRIGGER View

GETTING STARTED 3 - 15

3.10 PRE-TRIGGER VIEW

One of the powerful features in the digital mode is the ability to capture and view signal contents prior to the actual trigger. The amount of pretrigger information can be as long as one full acquisition/record. The trigger position is adjusted with the TRIGGER POSITION control.

Step 1 Turn the TRIGGER POSITION control counter clockwise. Now the triggering edge shifts to the center of the screen. A trigger point marker (s) indicates the trigger point. The part to the left of the marker is called pretrigger view. The pretrigger view is indicated in the bottom of the screen (in divisions)

1

TRIGGER

POSITION

1

DELAY=−5.00dV

ST6686

PRE-TRIGGER

VIEW

Step 2 The TRIGGER POSITION control can also be used to adjust time delay. Rotate the TRIGGER POSITION control clockwise until the readout displays "0". When you continue to turn the TRIGGER POSITION control clockwise, a positive delay between trigger point and acquisition is set. The delay is no longer read out in divisions of pretrigger information, but in seconds, or fractions of seconds to indicate how much delay is used.