Product Manual

291, 292, 294
Users Manual
General
Triggered burst and gated modes are selected from the MODE screen, called by the
MODE
key, as alternatives to the default continuous mode.
MODE: off
continuous
gated setup…
triggered setup…
In triggered burst mode a defined number of cycles are generated following each trigger
event. This mode is edge triggered.
In gated mode the generator runs whenever the gating signal is true. This mode is level
sensitive.
Triggered burst mode and gated mode can be controlled by either the internal trigger
generator, an external trigger input, by the front panel
MAN TRIG key or by remote
control.
In both modes the start phase, i.e. the starting point on the waveform cycle, can be
specified.
Internal Trigger Generator
The period of the internal trigger generator is set with the
period soft key on the
TRIGGER IN
set-up screen called by the TRIG IN key.
source: int force
slope: positive
level: +1.4 V
period: 1.00ms
The internal trigger generator divides down a crystal oscillator to produce a 1:1 square
wave with a period from 0·01 ms (100 kHz) to 200 s (0·005 Hz). Generator period
entries that cannot be exactly set are accepted and rounded up to the nearest available
value, so that for example 0·109 ms is rounded to 0·11 ms.
When triggered burst or gated modes are selected the
SYNC OUT source automatically
defaults to
trigger which is the output of the internal trigger generator when internal
triggering or gating is specified.
In triggered burst mode the selected edge of each cycle of the trigger generator is used to
initiate a burst; the interval between bursts is therefore 0·01 ms to 200 s as set by the
generator period.
In gated mode the output of the main generator is gated on whilst the internal trigger
generator output is true; the duration of the gate is therefore 0·005 ms to 100 s in step
with trigger generator periods of 0·01 ms to 200 s.
External Trigger Input
External trigger or gate signals are applied to the front panel
TRIG IN socket which has a
variable threshold level set using the
level soft-key; the level can be set from -5·0 V
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