Philips PM3350A - Page 45

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4 APPLICATIONS
- Trigger source selection
by pressing the TRIG OR X SOURCE key.
The trigger sources can be seiected from:
A channei A
AB composite channel A and channel B
B channel B
EXT channel EXTERNAL
LINE 50 Hz or 60 Hz sine-wave derived from the line voltage.
In composite triggering (A B) the trigger source alternates between A and B,
therefore this trigger mode is only possible in the alternated display mode.
Notice that in this mode the displayed traces are NOT time related while the
trigger pulses indicate different time moments. An example of composite
triggering is shown on the next page.
Line triggering is used where signals have to be measured that are time related
to the LINE frequency; e.g. measurements of hum.
4.1 USE AS AN ANALOQ OSCILLOSCOPE