Avtech AV-1010-C-3MA Instructions Manual page 19

Fig. 8
PULSE WIDTH MODULE
Hou ses le
- PULSE. WIDTH
The pulse width module sets the pulse width of the main
front panel output. The input is a TTL pulse from one
of the two outputs on the clock module, selected by SW5.
If the ADVANCE mode is selected, the SYNC pin of the
clock module triggers the pulse module. If the DELAY or
DOUBLE PULSE mode is selected, the OUT pin of the clock
module triggers the pulse module.
The output pulse width is determined by the resistance
across pins 8 and 9 and by the capacitance across pins 7
and 8. The capacitance is varied in steps by the fixed
capacitors on the PULSE WIDTH RANGE switch (SW6). The
resistance is controlled by the PULSE WIDTH FINE
potentiometer, which is in series with a minimum fixed
resistor also selected by SW6. The output is connected,
through SW2, to both the PG-P and PG-N modules when SW2
is in the INT position.
Pin connections
1. No connection
2. TTL Out (to pin 1 of the PG-P and PG-N modules,
through SW2)
3. TTL Out. This is the TTL complement of pin 2.
Not used.
4. TTL In. Connected to either pin 6 (SYNC) or pin
12 (OUT) of the clock module, through SW5.
5. Ground
6. Ground
8. The timing capacitance is placed across these
pins by SW6.
8,9. The timing resistance is placed across these
pins by PT4 and SW6.
10. Ground