Philips PM3320 Operating Manual page 50

4-30E
4.2.7 TRIGGER SECTION AND MENU STRUCTURE
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Selection of an external applied sampling clock.
This means that the conversion rate depends on the signal which is
applied to the EVENTS/EXT CLOCK input BNC socket and that the
internal time-base circuit is switched off. The signal level on which
the system reacts can be softkey selected via function EV/EXT CLKin
menu TRIGGER COUPLING.
If EXT CLOCK is selected by pushing pushbutton EXT CLOCK, and
EVENTS trigger delay was selected before, a message
EXTERNAL CLOCK selected with EVENTS active!
EVENTS switched off.
is displayed.
EXT CLOCK
BNC input socket for external applied clock signals.
The maximum clock frequency is 50 kHz.
Pushbutton EXT CLOCK must be pressed; built in pilot lamp lights.
EVENTS
BNC input socket for external applied events for trigger delay. For this
function pushbutton EXT CLOCK must be switched off.
Measuring earth socket.
BNC input socket for external triggering, to be used in combination
with the trigger source selection facility.