TM 11-6625-2980-14
Environmental Requirements. The following
paragraphs describe the environmental operating
conditions for the pulse generator.
The pulse generator can be operated where the
ambient temperature is in the range of 0° to +50
0C,
and
can be stored where the temperature range is -40° to
+750 C. After storage at temperatures outside of the
operating range, allow the chassis temperature to
stabilize within the operating limits before applying
power.
Components that require the most cooling are
provided with individual heatsinks. Clearance must be
provided on all sides for air flow. Do not block or restrict
air flow through any holes in the cabinet by placing
objects on or against the pulse generator.
Two thermal cutouts in the pulse generator provide
protection by interrupting power to the unit if the internal
temperature exceeds a safe operating level. Power is
automatically restored when the temperature returns to
a safe level. Operation in confined areas or near heat-
producing equipment may cause the thermal cutouts to
actuate.
The normal operating position of the pulse generator
is horizontal, setting on a flat surface, on the four feet
provided on the bottom surface, or with the front bail
extended, lifting the front panel for ease in reading or
adjusting controls. However, under difficult operating
conditions (such as limited space), the pulse generator
may be used in other positions without impairment of
the electrical characteristics, including setting the
cabinet on the four protective bumpers on the rear
surface or left side. It is important to remember that, in
positions other than normal horizontal position,
characteristics such as cooling and resistance to shock
and vibration are altered, therefore, operation in other
than the normal position should be for short periods only
and with more than normal care exercised to protect the
pulse generator from damage.
Power Requirements. The pulse generator is
designed to be operated from either a 115-volt nominal
or 230-volt nominal line voltage source. In addition, one
of three operating ranges may be selected around each
nominal voltage. The voltage selector jumper in the
power module allows selection of the operating voltage.
Space Requirements. The pulse generator is
provided with feet on the bottom surface to provide
space for cooling air flow, as well as the front bail.
Maintain this clearance by always using the front bail or
setting all four feet solidly on a flat surface. In addition,
always maintain at least two inches of clearance at both
sides, top, and rear of the unit.
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