1、 TIA-455-190 March 1992 (r 01/2012) FOTP-190 Low Air Pressure (High Altitude) Testing of Fiber Optic Components NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interch
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22、ISHED BY TIA WITHOUT SUCH LIMITATIONS. a a Section 1. 2. 3. 4. 5. 6. 7. 8. APPENDIX _ - - EIA TIA-455-L90 92 m 3234600 0503095 454 EIA/TIA-455-190 FOTP-190 LOW AIR PRESSURE (HIGH ALTITUDE) TESTING OF FIBER OPTIC C0MP“TS TABLE OF CONTENTS INTRODUCTION APPLICABLE DOCUMENTS APPARATUS SAMPLING AND SPECI
23、MENS PROCEDURE CALCULATIONS OR INTERPRETATION OF RESULTS DOCUMENTATION SPECIFICATION INFORMATION COMPARISON BETWEEN FOTP-190 AND IEC, ISO, AND CCITT REQUIREMENTS Paqe 1 2 3 3 4 6 7 8 9 . . _I-. EIA TIA-455-190 72 m 3234600 0503076 390 m EIA/TIA-455-190 Page 1 FOTP-190 LOW AIR PRESSURE (HIGH ALTITUDE
24、) TESTING OF FIBER OPTIC COMPONENTS (From EIA Standards Proposal No. 2243, formulated under the cognizance of TIA FO-6.3, Subcommittee on Fiber Optic Interconnecting Devices, and TIA FO-6.4, Subcommittee on Fiber Optic Test Methods and Instrumentation.) This FOTP is part of the series of test proced
25、ures included within Recommended Standard EIA/TIA-455. 1. INTRODUCTION 1.1 The intent of this test is to provide a means of evaluating the effects of low barometric pressure (high altitude) on fiber optic components. Although intended primarily for the evaluation of devices such as interconnecting d
26、evices, the method may be applied to other components when applicable and when required by a Detail Specification. 1.2 Alternative Method. This test is similar to that prescribed by FOTP-15, except that specimens tested under FOTP-15 are immersed in water during low pressure exposure in order to sim
27、ulate the effects of moisture condensation which accompany rapid descents from high altitude. Also, FOTP-190 provides a wider choice of test pressures than does FOTP-15. Intent. 1.3 Failure Modes. The potential failure modes for this test include, but are not limited to: a. b. Unacceptable changes i
28、n optical transmittance, Unacceptable changes in insertion loss, c. d. Damage to device seals, e. Other failure modes (such as changes in engagement and Unacceptable changes in return loss, separation forces) may be specified by the Detail Specification. This method is similar to Method 105C of MIL-
29、STD-202. EIA/TIA-455-190 Page 2 2. APPLICABLE DOCUMENTS The following documents form a part of this FOTP to the extent specified herein: EIA/TIA-455-A “Standard Test Procedures for Fiber Optic Fibers, Cables, Transducers, Sensors, Connecting and Terminating Devices, and Other Fiber Optic Components
30、IV FOTP-13 (EIA-455-13) Visual and Mechanical Inspection of Fiber, Cables, Connectors and/or Other Fiber Optic Devicespf FOTP-15 (EIA/TIA-455-15A) llAltitude/Immersion of Fiber Optic Componentsf1 FOTP-20 (EIA/TIA-455-20A) Measurement of Change in Optical Transmittancef1 FOTP- 3 4 ( EIA/TIA-455- 3 4A
31、) ffInterconnection Device Insertion Loss Test“ FOTP-107 (EIA/TIA-455-107) !Return Loss For Fiber Optic Components11 MIL-STD- 20 2F4 “Test Methods For Electronic And Electrical Component Parts“ Method 105C lfBarometric Pressure (Reduced)ll IEC-68-2-13, 4th Ed. “Basic environmental testing procedures
32、, Part 2: Tests, Test M: Low air pressure! In process of preparation. Pending publication of this revision, use EIA RS-455-20. In process of preparation. Pending publication of this revision, use EIA-455-34. 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, or from the procuring activity, or as d
33、irected by the contracting officer. Available from Standardization Documents Order Desk, Bldg. I - _s_ _ - EIA TIA-455-190 92 m 3234600 O503098 163 m EIA/TIA-455-190 Page 3 “Connectors for optical fibres and cab les I t 5 IEC-874-1, 3rd Ed. 3. APPARATUS The following apparatus and equipment is requi
34、red to perform this test: 3.1 Altitude Chamber. Use an appropriate altitude test chamber consisting of a suitable sealed chamber which has means for visual observation of the specimen under test, when necessary. 3.2 Vacuum Pump. The test chamber pressure shall be reduced by means of vacuum pump equi
35、pment which is capable of maintaining the reduced pressures as shown in Table I, as required, with a tolerance of k 5% or k 0.1 kPa (.O3 inches of mercury), whichever is larger. Note: A tolerance of k 2 kPa is acceptable for pressures higher than 82 kPa (24.3 inches of mercury). 3.3 Pressure Indicat
36、or. Use a suitable pressure indicator to measure the simulated altitude in the sealed chamber to the tolerances specified in 3.2. 3.4 Other Equipment. Optical and other test equipment shall be available as required by FOTPs -13, -20, -34, or -107 (or other), as appropriate. 4. SAMPLING AND SPECIMENS
37、 4.1 Samples. Unless otherwise specified: (a) Select samples randomly from production lots of the component to be tested. (b) Test specimens shall be fully assembled (mated, if a connector) fiber optic components with appropriate test cables attached. 4.2 Spechen Preparation. After completing proced
38、ure step 5.1, place specimen(s) in the chamber, mounted as specified. The connected cable(s) shall be arranged so as to prevent any extreme bends which might damage the fiber, and with cable ends out for connection to optical measuring equipment. In process of preparation. Pending publication of thi
39、s revision, use IEC SC86B(Central Office)69 dated July 1989. O EIA/TIA-455-190 Page 4 5. PROCEDURE 5.1 Pre-Test Inspection. Before installing specimens in the test chamber, make a visual and physical examination of each specimen in accordance with FOTP-13 to assure that specimens have not been obvio
40、usly damaged before test. 5.2 Pre-Altitude Reference Measurements. After specimens are installed in the altitude chamber, and before evacuating the chamber, perform any pre-test optical tests required by the Detail Specification. Unless otherwise required by the Detail Specification, measure the opt
41、ical transmittance of all optical paths in accordance with the requirements of FOTP-20. (Use of FOTP-34 to measure insertion loss, or of FOTP-107 to measure return loss, may be specified by the Detail Specification as alternatives to FOTP-20.) Record results. Seal the test chamber. 7 TABLE 1 AIR PRE
42、SSURE “EST CONDITIONS Test Pressure - Maximum Equivalent Altitude Condition inches of mm of Letter kPa mercury mercury Feet Meters A 84 24.81 630.17 - near sea level - B 70 20.67 525.02 9,843 3,000 C 58.58 17.3 439 . O0 15,000 4,572 D 55 16.25 412 . 75 15,912 4,850 E 40 11 . 81 299.97 23,622 7,200 F
43、 30.07 8.88 226.00 30;OOO gil44 G 25 7.38 187 . 45 34,121 10,400 15 4.43 112.52 44,619 13,600 H I 11.65 3.44 87.00 50,000 15,240 J 8 2.36 59 . 94 57,743 17,600 K 4.44 1.31 33.00 70;OOO 21;336 M 2 O . 591 15.01 87,270 26,600 1.07 0.315 8.00 100,000 30,480 N L 4 1.19 30.23 72,507 22,100 O 1 O . 292 7.
44、42 102 362 31 200 P 0.146 O. 043 1.09 150,000 45,720 Q 0.032 0.009436 0.24 656,000 200,000 a a _-_-_. EIA TIA-455-190 92 0 3234b00 0503100 641 m EIA/TIA-455-190 Page 5 5.3 Altitude (Low Pressure) Test. 5.3.1 Reduce the chamber pressure from room ambient to one of the test conditions shown in Table 1
45、, as specified by the Detail Specification. If no condition is specified, use test condition F. If required by the Detail Specification, the rate of change of air pressure shall not exceed 10 kPa/min. (2.95 inches of mercury per minute). 5.3.2 Maintain the specified pressure level for the period of
46、time specified in the Detail Specification. Exposure shall be long enough to ensure that all entrapped air in the chamber and in the specimen(s) has escaped. Preferred exposure durations are shown in Table 2. If no exposure time is specified, hold the pressure level for a minimum of 30 minutes. TABL
47、E 2 PREFERRED LOW PRESSURE EXPOSURE DURATIONS Durat ion Minutes Hours 5 30 2 4 16 5.4 Low Pressure Test Measurements. After completion of the required exposure time, and while the specimens are still maintained at the specified pressure, repeat the optical measurements made in 5.2. Compare the resul
48、ts of the post-test measurements with those established in 5.2. Acceptance criteria for such measurements shall be as specified by the Detail Specification. (The note at the end of 5.6 also applies here.) 5.5 Pressure Recovery. Allow the chamber pressure to return to room ambient pressure. If requir
49、ed by the Detail Specification, the rate of change of air pressure shall not exceed 10 kPa/min. (2.95 inches of mercury per minute). a _ - -_ EIA TIA-455-190 52 H 3234600 0503LOL 588 H EIA/TIA-455-190 Page 6 5.6 Post-Altitude Test Measurements. After pressure has returned to room ambient, unseal the test chamber. Unless otherwise specified in the Detail Specification, allow the specimen(s) to remain in the chamber under standard atmospheric conditions for a period of not less than 1 hour, nor more than 2 hour s. Then, unless otherwise specified
