Philips PM3320 Operating Manual page 124

4-104E
4.3,10.2
4,3,10.3
SINGLE and MULTIPLE-modes
SINGLE and MULTIPLE shots can be taken in the direct mode (time base range 5 s/div ... 200
ns/div). This is very useful for displaying single phenomena.
SINGLE and MULTIPLE scans can be taken in the random sampling mode (time base range 5
ns/div... 100 ns/div), and in the direct mode when the MAXIMUM RESOLUTION modeis on (time
base range 500 us/div ... 200 ns/div). Then the pilot lamp "REP ONLY" is on.
During a scan there are taken as many sweeps as necessary to make a complete picture on the
screen.
When the SINGLE-mode is selected, the contents of register RO is refreshed once after a trigger
pulse and the selected delay-time, and the refreshed contents of register RO is displayed on the
C.R.T. screen.
As long as the instrument is waiting for a trigger pulse, the pilot lamp NOT TRIG'D will light.
When the MULTIPLE-mode is selected, the previously described SINGLE-action is repeated
four times. The result of the first SINGLE action in register RO is copied to register R3, the second
result is copied to register R2, the third to register R1 and the fourth stays in register RO. This is
independent of the registers being displayed or not.
The number of single actions to be executed is counted down in the top text area on the C.R.T.
When either the SINGLE- or the MULTIPLE-action is not completed, the text ARMD (ARMeD) in
the soft-key text area is intensified.
A new shot or scan can be taken by pressing the relevant softkey or the CLEAR pushbutton.
In the time base range 5 s/div...1 ms/div, the resolution is 1x4096 or 2x2048 samples (the same as
in RECURRENT mode).
In the time base range 500 us/div...200 ns/div, the resolution is 512 samples per channel at each
shot.
The samples are placed in the locations 0/, 8, 16, 24, etc. of register RO. Intermediate samples
until 1x4096 or 2x2048 are calculated and not displayed if DOTS if on.
In the time base range 100 ns/div...5ns/div, a scan takes as many sweeps until 512 samples, or
2x512 samples, are taken. intermediate samples unti! 1x4096 or 2x2048 are calculated and not
displayed if DOTS is on.
ROLL mode
The continuous ROLL mode is typically used for very low frequency signals and is effective with
TIME/DIV settings from 50 ms/div... 360 s/div. The signal is recorded in register RO and is
built-up point-by-point from the right-hand side of the C.R.T. screen and continuously shifted
towards the left.
This mode can be selected via the HORIZONTAL MODE menu and can be started by pressing the
RUN/STOP softkey once.