DESCRIPTION AND USE OF CONTROLS AND INDICATORS - CONT
ELECTRONIC TEST CHAMBER ASSEMBLY, MODEL 453 CONT
CONTROL OR INDICATOR
FUNCTION OR USE
Altitude Chamber Switch Lever Operates AR2 automatic ripcord release JUMP/OFF
switch when AR2 is enclosed in altitude chamber.
Altitude Chamber Lid
Allows access to altitude chamber.
Aligns AR2 and altitude chamber piston rod.
SET ALTITUDE control
Use to set altitude in test chamber.
SET FALL RATE control
Use to set fall rate.
ALTITUDE DWELL indicator
Blinks continuously while the chamber is gaining altitude
and during the time while the AR2 is stabilizing. When
sufficient time at altitude has elapsed, the indicator will
stop blinking and remain steadily illuminated, signifying
that the test may be initiated. The indicator goes out
when a valid FALL command is given.
GO TO ALT AND DWELL
Pressing this switch causes the chamber to climb to the
set altitude. As this altitude is reached, the fall-rate
value will decrease to zero. The switch will function with
the chamber vented, but the chamber will not be able to
gain altitude until the DUMP circuit is disengaged.
Becomes steadily illuminated when a valid FALL
command is given. It remains illuminated while the test
is in progress and after the AR2 actuates. It
extinguishes when the GO TO ALTITUDE AND DWELL
control is pressed.
Pressing this switch initiates the test. Because of
interlocks built into the system, however, the switch will
not function unless the AR2 has been recocked, the
displays have been reset, sufficient dwell time at altitude
has elapsed, the Jump switch has been set to ON and
no other indicators are blinking or illuminated except the
JUMP SWITCH ON indicator.
HOLD DOWN TO COCK
Depressing and holding this switch recocks the AR2
after an actuation. Its function may be verified by
observing the movement of the piston rod through the lid
of the altitude chamber. Interlocks in the system
prevent this switch from functioning unless the AR2 is in
the actuated condition and the JUMP/OFF switch is set
JUMP SWITCH OFF indicator
This indicator remains steadily illuminated whenever the
AR2 JUMP/OFF switch is in the fully OFF position.