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BURST
In the burst mode, the instrument generates the selected
waveform for the specified mark wave number and
space wave number. No trigger signal is required to initi-
ate the waveforms. The mark wave number and space
wave number can be set by first pressing the
DISPLAY
SELECT
button so that the
LED
is lit next to
GPIB
on the
upper left of the display. When the
LED
is lit next to
GPIB,
the mark wave number and space wave number
can be found on the right side of the display. Then by us-
ing the
4 and. keys advance the cursor to either
mark
wave number or space wave number. Turn the
MODIFY
knob UP (clockwise) to increase the wave number or
DOWN
(counter-clockwise) to decrease the wave num-
ber. The phase where oscillation starts can be set in 0.1"
from +360.0° to - 3 6 0 . 0 ° .
TRIG
(trigger)
In the trigger mode, the instrument generates the se-
lected waveform for the number of specified mark wave
numbers each time a trigger comes from the outside. The
trigger signal is effective o d y while oscillation is
stopped, and trigger signals prior to when the oscillation
finishes are ignored. To
set the mark wave number first
press the DISPLAY
SELECT
button so that the
LED
is lit
next to
GPIB
on the upper left of the display. When the
LED
is lit next to
GPTB, the mark wave number can be
found on the right side of the display. Then use the4and
b
keys to advance the cursor to the mark wave number.
Turn the
MODIFY
knob UP (clockwise) to increase the
mark wave number or
DOWN
(counter-clockwise) to
de-
crease
the
mark wave number.
The
phase where oscilla-
tion starts can be set
in
O . 1 ° units from +360.0° to
-360.0°.
Triggering
is
performed by either using the TlUG IN (ex-
ternal trigger)
BNC
jack or
by
pressing the MAN (man-
ual)
key on the front of the unit.
Figure
3-6
shows the relationship between the trigger
signal and osciIIation in
TRIG
mode.
GATE
In the GATE mode, the unit generates oscillations
as long
as the gate signal (trigger signal)
is
on. When the gate sig-
nal turns
o'ff, the Model
3910 will always
stop oscillating
at the end of one complete cycle even if the gate signal
turns off at the mid point of a cyde. Thus, the Model 3910
always provides integral
cycles
of oscillation. The phase
where the oscillation starts can be set
in 0.1" units
from
+360.0° to - 3 6 0 . 0 ° .
Triggering is performed by either using the
TRIG
IN
(ex-
ternal bigger) BNC jack or by pressing the MAN (man-
ual) key on the front of the unit.
Figure 3-7 demonstrates how the output waveform al-
ways completes the current
cyde
when the gate signal
turns off.
Output
Waveform
I
Trigger
I
1
Signal
I
-
I
I
-
-_.
----
- - - - - - - - - - - + - - - I _ _ _ _
' i
Ignored
Figure 3-6.
Relationship befween Trigger Signal and Oscillation in TRIG Mode
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