Philips PM3320 Operating Manual page 125

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Figure 4.49 ROLL-mode action.
No trigger is needed in this mode. ~~.
During the ROLL mode action, the text RUN in the softkey text area is intensified displayed. The
ROLL mode can be stopped by pressing the RUN/STOP softkey once again. The text STOP in
the softkey area is then intensified displayed.
When TRIG STOP is selected, the ROLL mode can be stopped by a trigger signal. The triggered
STOP can be delayed by selecting a trigger delay.
The resolution is 4000 dots over 10 divisions in single channe! mode and 2000 dots {per channel)
over 10 divisions in dua! channel mode.
The ROLL mode can be started again by depressing the RUN/STOP softkey or pushbutton
CLEAR.
NOTE: In AUTO trigger mode every 0,1 s a trigger pulse is generated which gives a
triggered stop.
If trigger. delay 0 is selected, the trigger (stop) point is at the left side of the screen. .
This means that after the actual stop signal the screen continues 10 divisions,
EXT CLOCK mode
By applying an external clock frequency of max. 50 kHz to the EVENTS/EXT CLOCK BNC input
socket and with the pushbutton EXT CLOCK depressed, the user is able to determine the
conversion rate.
The interna! digital time-base generator is not used then, which is indicated by the text TB
EXTERN in the top text area on the C.R.T. screen.
The trigger delay facility still functions but can only be selected in divisions.
Cursor time measurements are not possibie, which is indicated in the top text area by the text
EXT.CLOCKI! in stead of dV... .