HP 8920A Application Handbook page 241

Measurement Using the Trigger Control Fields:
•
•
•
•
Indicators:
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
From Controls select the desired trigger source:
• Internal uses the signal being displayed.
• Ext (TTL) uses the signal connected to the rear panel EXT SCOPE
TRIGGER INPUT connector.
• Encoder uses the optional signaling encoder.
Trigger mode is selected as follows:
• In Auto, a trigger is automatically generated every 50ms (unless a
normal trigger is received).
• In Norm, a defined trigger required.
• In Cont, the oscilloscope sweeps on each trigger occurrence.
• In Single, the oscilloscope sweeps once on a trigger occurrence af-
ter Reset is selected.
Level (div) sets the internal trigger level (vertical divisions). Pos selects
triggering for positive going signals. Neg selects triggering for negative
going signals. Pointer indicates level.
Pre-Trig sets the number of horizontal divisions to be displayed prior
to the trigger. Pointer indicates pre-trigger point.
• Marker Time ms changes the units that the marker position is dis-
played in. Displayed value is the time elapsed from the trigger point
to the current position.
• Marker Lvl V/kHz/% changes units that the marker position is dis-
played in. Displayed value is signal level at current position.
Using the Oscilloscope
239