Avtech AV-1010-C-NCSU Instructions Manual page 8

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C) FRONT PANEL CONTROLS
POWER Switch. The POWER push button switch applies AC
prime power to the primaries of the transformer, turning
the instrument on. The push button lamp (#382 type) is
connected to the +15V DC supply.
INT/EXT Switch. In the "INT" position the instrument is
internally triggered and the "SYNC OUT" connector
provides a SYNC output which allows one to trigger other
instruments, such as_ oscilloscopes. In the "ExT"
position the instrument is triggered by a +0.5V to +40V
50 ns (or wider) input pulse on the "TRIG IN" connector,
or by pressing the "SINGLE PULSE" push button.
SINGLE PULSE Push Button. The "SINGLE PULSE" push
button will trigger the instrument manually for one
cycle of output, when the "INT/EXT" switch is in the
"EXT" position. Otherwise, the push button has no
effect.
SYNC OUT. When the "INT/EXT" switch is in the "INT"
position, this connector supplies a SYNC output that can
be used to trigger other equipment, particularly
oscilloscopes. This signal leads, or lags, the main
output by a duration set by the "DELAY" controls and has
an approximate amplitude of +3 Volts to RL 1K witha
pulse width of about 50 ns.
TRIG IN. When the "INT/EXT" switch is in the "ExT"
position, the external trigger (+0.5 Volts to +40 Volts,
PW 50 ns) is applied to this connector. This input
presents a high impedance (1 M Ohm).
TRIGGER LEVEL. This one turn control varies the EXT
trigger level from +0.5 Volts to +40 Volts.
GATE Input. The GATE input will suppress the triggering
of the instrument if grounded or taken to a TTL LOW
level (i.e. 0 to 0.8V). If it is left open or taken to
a TTL HIGH level (i.e. +2.4V to 5.0V), normal triggering
will occur (RIN = 50 Ohm).