Agilent Technologies HP8648A Manuale Utente Scaricare il pdf (Pagina 240)

Using the Oscilloscope

239

Measurement Using the Trigger Control Fields:

•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.

Indicators:

•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.

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Agilent Technologies HP8648A Manuale Utente Pagina 240