Avtech AV-1011-C-OP1 Instructions Manual page 12

(12)
(13)
(14)
(15)
R_ OUT RANGE Switch. A two-position switch which sets
the output resistance at 2 Ohms or 50 Ohms. In the 2
Ohm range, the unit will provide up to 100 Volts (toa
50 Ohm load) while in the 50 Ohm range, the unit will
provide up to 50 Volts to a 50 Ohm load.
AMPLITUDE FINE. The ten turn amplitude vernier
provides continuously variable control of the peak
amplitude of the main output from 0 to 50 Volts (50
Ohm range) or 0 to 100 Volts (2 Ohm range). When the
unit is operating at a low duty cycle and an attempt
is made to reduce the output amplitude, the amplitude
will decay slowly with a time constant of several tens
of seconds. If a rapid decay is required, briefly
switch the rear panel HV switch to the "OFF" position
(and then back to the "ON" position).
OUT. BNC connector provides output to load impedance
of 50 Ohms or higher.
OVERLOAD. An automatic overload protective circuit
controls the front panel overload light. If the unit
is overloaded (by operating at an exceedingly high
duty cycle or by operating into a very low impedance),
the protective circuit will turn the output of the
instrument OFF and turn the indicator light ON. The
light will stay ON (i.e. output OFF) for about 5
seconds after which the instrument will attempt to
turn ON (i.e. light OFF) for about 1 second. If the
overload condition persists, the instrument will turn
OFF again (i.e. light ON) for another 5 seconds. If
the overload condition has been removed, the
instrument will turn on and resume normal operation.
Overload conditions may be removed by:
1) Reducing PRF (i.e. switch to a lower range)
2) Reducing pulse width (i.e. switch to a lower
range)
3) Removing output low load impedance (if any)
4) Reducing the output amplitude (i.e. switch to a
lower range)
Note that the output stage will safely withstand a
short circuited load condition.