TM 10-1670-305-23&P
DESCRIPTION AND USE OF CONTROLS AND INDICATORS
0007 00
KEY
CONTROL OR INDICATOR
FUNCTION OR USE
12
JUMP SWITCH ON indicator
This indicator remains steadily illuminated whenever the
AR2 JUMP/OFF switch is in the fully JUMP position. Its
color, green, matches that on the AR2 JUMP/OFF
switch and signifies that the AR2 is prepared for the test.
The FALL switch will not function unless this indicator is
illuminated. Once the fall has been initiated, however,
the JUMP/OFF switch may be returned to the OFF
position without affecting the test. The AR2 will not
actuate with the JUMP/OFF switch OFF.
13
HOLD DOWN TO SET switch
When this switch is depressed, the displays show the
altitude and fall rate to which the chamber has been
adjusted. As long as the button is held down, the values
displayed on the meters are the set values. When the
button is released, the meters display the presently
existing chamber conditions. This switch will function at
any time (even during a fall) except when the displays
are locked.
14
SET VALUES DISPLAYING
indicator
This indicator blinks continuously only while the HOLD
DOWN TO SET switch is depressed.
15
DUMP switch
Pressing this switch vents the chamber to rapidly return
to ambient altitude. This switch has a latching
mechanism which keeps it locked in the on (CHAMBER
VENTED) position until it is pressed again.
16
CHAMBER VENTED
indicator
This indicator blinks continuously whenever the DUMP
circuit is engaged.
17
RESET DISPLAYS switch
This switch clears the values locked into the displays
from the previous actuation. To prevent inadvertent loss
of data, the switch will not function until after the AR2
has been recocked.
18
DISPLAYS LOCKED
indicator
This indicator becomes illuminated at the instant the
AR2 actuates and blinks continuously while the displays
are in the locked condition. It goes out when the
RESET DISPLAYS switch is pressed, provided the
correct conditions are present to reset the meters.
19
FALL RATE (FT/SEC) display This indicator displays fall rate.
20
ALTITUDE (FT MSL) display
This indicator displays altitude.
21
ON/OFF switch
Use to turn unit ON and OFF.
22
Fuse, 5 AMP, slow blow
Protects circuitry in Control Assembly.
23
Calibration port
Use to connect calibration standard to control assembly.
24
Identification decal
Identifies Model 453 Electronic test chamber Assembly.
25
Control Assembly decal
Identifies control assembly and adjustment screws.
26
Control Assembly
Contains testing control components.
27
Lifting Handle
Use to lift test chamber.
0007 00-7/8 Blank
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