TM 10-1670-305-23&P
0010 00-2
ELECTRONIC TEST CHAMBER ASSEMBLY, MODEL 453
0010 00
OPERATION UNDER USUAL CONDITIONS - CONT
INITIAL ADJUSTMENT BEFORE USE - CONT
NOTE
Ensure that the test chamber is in calibration (WP 0018 00).
1. For all testing, an AR2 shall be installed in the altitude chamber.
2. If necessary, set AR2 JUMP/OFF switch to OFF. Set altitude dial to 1000 feet. Cock AR2 and
remove storage cable and piston rod cap.
3. Open altitude chamber lid (2). Position the cocking support (3) and install the AR2. Align
AR2 JUMP/OFF switch lever with altitude chamber switch lever.
4. Close altitude chamber lid.
NOTE
The unit shall be turned on and warmed up for 30 minutes minimum before
beginning any tests.
5. Plug power cord into 110 VAC 50/60 Hz outlet.
6. When ready to start test, position control assembly ON/OFF switch (21) to ON. When
switching test chamber on, immediately look at the end of vacuum pump/air compressor to
ensure that the cooling fan is spinning. If fan is not spinning, immediately press and release
HOLD DOWN TO COCK switch several times until fan spins.
ALTITUDE STABILITY TEST
1. If necessary, press DUMP switch (15) to extinguish CHAMBER VENTED indicator (16).
Press RESET DISPLAYS switch.
2. Press and hold HOLD DOWN TO SET switch (13). Use SET ALTITUDE control (4) to set
altitude to 2000 10 feet as observed on ALTITUDE (FT MSL) display (20). Release HOLD
DOWN TO SET switch (13).
3. Press and hold HOLD DOWN TO SET switch (13). Turn SET FALL RATE control (5) fully
counter-clockwise.
4. If necessary, reset ALTITUDE (FT MSL) display (20) to 2000 10 feet. Release HOLD
DOWN TO SET switch (13).
5. Record altitude reading.
6. Wait three minutes.
7. Record altitude reading.
