Avtech AV-1010-C-MI Instructions Manual page 18

Fig. 6
THRESHOLD MODULE
Pin connections
1. No connection
2. Input,
connected
to
"EXT
TRIG" BNC
connector
on
the front panel
3. <-15V input
4. TTL
Out
(to pin
15
of clock
module)
5. Ground
6. Ground
7. +5V input
8. +15V input
9,
Level.
This
pin is
connected
to
the front
panel
"LEVEL"
potentiometer.
The
voltage
on this
pin
is proportional
to
the
trigger
threshold.
The
voltage
ranges
between
~-15V and
+15V,
which sets
the
threshold
at
+40V and
-40V,
respectively.
10. No connection