AVTECH ELECTROSYSTEMS AVRQ-4-B, Instructions Manual

Page: 31 / 75

The next figure illustrates the relationship between the signals when an external TTL-
level trigger is used:
As before, if the delay is negative, the order of the SYNC and OUT pulses is reversed.
The delay and frequency (when in the internal mode), of the OUT pulse can be varied
with front panel controls or via the GPIB or RS-232 computer interfaces.
TRIGGER MODES
This instrument has four trigger modes:

Internal Trigger: the instrument controls the trigger frequency, and generates the
clock internally.

External Trigger: the instrument is triggered by an external TTL-level clock on the
back-panel TRIG connector.

Manual Trigger: the instrument is triggered by the front-panel “SINGLE PULSE”
pushbutton.

Hold Trigger: the instrument is set to not trigger at all.
31
SYNC OUT
100 ns, FIXED
HV PULSE
PULSE
WIDTH
(1-20us)
DELAY > 0
(VARIABLE)
3V, FIXED
> 50 ns
TTL LEVELS
(0V and 3V-5V)
TRIG
(external input)
PROPAGATION DELAY (FIXED)
RISE TIME,
VARIABLE
FALL TIME
(NOT
VARIABLE)
AMPLITUDE,
-1.5 or +1.5 kV
TYPICALLY