Code 549 - Environmental Test Engineering and Integration

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•	Facilities
	- T/V Facility 225 (9'x14')
	- T/V Facility 237 (7' x 8')
	- T/V Facility 238 (12' x 14')
	- T/V Facility 239 (7' x 8')
	- T/V Facility 240 (3' x 3')
	- T/V Facility 241 (3' x 4')
	- T/V Facility 245 (2' x 3')
	- T/V Facility 246 (3.5' x 5.5')
	- T/V Facility 281 (3' x 4')
	- T/V Facility 290 (27' x 40')
	- T/H Facility 204 (2.2 ft³)
	- T/H Facility 232 (64 ft³)
	- T/H Facility 233 (64 ft³)
•	Personnel

Facility 245 is a horizontal, cylindrical, a turbomolecular pumped thermal vacuum test chamber used for bakeout of small test articles. The payload is placed on a rack that is supported by rails.

Facility 245

Mode of Operation

After the test article is instrumented with thermocouples and placed in the chamber, ground support equipment cabling is connected through penetration plates and ambient functional checks are performed. After roughing down the chamber with the rotary piston mechanical pump, ultimate pressure is achieved with the turbomolecular pump.

Parameters
Test Pressure: <13.3µPa (10-7 torr)
Shroud Temperature:+20°C to +150°C
Chamber Pumping Speed: 1,600 lit/sec @ 133 µPa

Physical Characteristics

Test Volume: 21" x 40"

Integral Instrumentation

Pressure: Capacitance manometer - Atm to 10-3 mmHg
Ion Gauge: 10-3 mmHg to ultimate
Payload Temperature: 18 thermocouple channels
Contamination Monitor: TQCM, coldfinger, residual gas analyzer

NASA Goddard Space Flight Center

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