General Information; Basic Pulse Control - Avtech AVR-8F-B-P-ADB1A Instructions Manual

BASIC PULSE CONTROL

This instrument can be triggered by its own internal clock or by an external TTL trigger
signal. In either case, two output channels respond to the trigger: OUT and SYNC. The
OUT channel is the signal that is applied to the load. Its amplitude and pulse width are
variable. The SYNC pulse is a fixed-width TTL-level reference pulse used to trigger
oscilloscopes or other measurement systems. When the delay is set to a positive value
the SYNC pulse precedes the OUT pulse. When the delay is set to a negative value the
SYNC pulse follows the OUT pulse.
These pulses are illustrated below, assuming internal triggering and a positive delay:
SYNC OUT
(generated by the
internal oscillator)
MAIN OUTPUT
If the delay is negative, the order of the SYNC and OUT pulses is reversed:
SYNC OUT
(generated by the
internal oscillator)
MAIN OUTPUT
The next figure illustrates the relationship between the signal when an external TTL-
level trigger is used:

GENERAL INFORMATION

100 ns, FIXED
DELAY > 0 PULSE WIDTH
Figure A
DELAY < 0
PULSE WIDTH
Figure B
3V, FIXED
AMPLITUDE,
VARIABLE
100 ns, FIXED
3V, FIXED
AMPLITUDE,
VARIABLE
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