1、EIA Lb-LE ? W 3234600 0028555 9 W ANSI/EIA RS-186-E-78 . Approved October 27, 1978 EIA STANDARD STANDARD TEST METHODS FOR PASSIVE ELECTRONIC COMPONENT PARTS METHOD 1: HUMIDITY (STEADY STATE) I (Revision of RS-186-0, Method 1) OCTOBER 1978 1 ELECTRONIC INDUSTRIES ASSOCIATION I EIA 186-LE 78 m 3234600
2、 0028556 O m NOTICE EIA engineering standards are designed to serve the public interest through eliminating mis- understandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with mini- mum del
3、ay the proper product for his particular need. Existence of such standards shall not in any respect preclude any member or non-member of EIA from manufacturing or selling products not conforming to such standards, nor shall the existence of such standards pre- clude their voluntary use by those othe
4、r than EIA members whether the standard is to be used either domestically or internationally. Recommended standards are adopted by EIA without regard to whether or not their adop- tion may involve patents on articles, materials, or processes. By such action, EIA does not assume any liability to any
5、patent owner, nor does it assume any obligation whatever to parties adopting the recommended standards. This Standard contains the major technical contents of International Electrotechnical Com- mission Publication 68-2-3, Test Cu: Dump Heat, Steady Stute. It differs from IEC Publication 68-2-3 by o
6、nly slight variations in control and operating procedure. These differences are well known to the US. Committee of Experts for the International Electrotechnieal Commission Technical Committee 50 and resolution of these differences will be sought in future meetings of TC-50. PubWed by ELECTRONIC IND
7、USTRIES ASSOCIATION Engineering Departnient 2001 Eye Street, N, W., Washingtan, D. C. 20006 Q Electronic indwtcics AMocfetlon 1979 AU rights rewmre PRICE: $3.00 EIA Lb-LE 78 = 3234600 0028557 2 .- RS-186- 1E Page 1 STANDARD TEST METHODS FOR PASSIVE ELECTRONIC COMPONENT PARTS METHOD 1 HUMIDITY (STEAD
8、Y STATE) (From EIA Standard RS-186-D and Standards Proposal No. 1271 formulated under the cognizance of the EL4 P-9 Committee on Test Methods and Procedures.) . INTRODUCTION This Test Method forms a part of the EIA Standard RS-186 which contains test guidance, definitions and standard test condition
9、s. 1. 2. 2.1 2.2 2.3 PURPOSE This test is intended to evaluate the effect of absorption and diffusion of moisture and moisture vapor on component parts. The test in an artificial environmental test, accelerated to shorten the testing time. This test is of value in determining the resistance of the c
10、omponent parts to the inroads of moisture, but should not be considered as a tropical test for all types of component parts. PROCEDURE Mounting - Unless otherwise specified in the individual specification, specimens shall be mounted by their normal mounting means. Pre-Conditioning and Initial Measur
11、ements - Unless otherwise specified, the specimens shall be conditioned at a temperature of 50 *SoC(122 +9“F) for a period of 24 hours. At the end of this period, specimens shall be allowed to thermally stabilize under standard conditions of test, and initial measurements shall then be made as speci
12、fied in the individual specification. Exposure - The specimens shall be placed in a chamber and subjected to a relative humidity of 90 to 95% and a temperature of 40 +2“C(104 +3.6“F) for one of the standard periods of time indicated below, Unless otherwise specified, the 10 day (240 h.) exposure sho
13、uld be used. 96 hours 240 hours 504 hours 1344 hours (4 days) (10 days) (21 days) (56 days) A tolerance of +3% of the total time shall be allowed. 2.4 Controlled Conditions - In order to insure the temperature and humidity are controlled within the limits of the specification. The instrumentation ac
14、curacy should be +l0C on temperature and *i% R.H. on moisutre. The water utilized to produce the atmosphere should be conditioned by an appropriate method to assure consistently pure water with a pH value between 6.0 and 7.2 at 23C(73“F). 2.5 Loading and Polarizing Voltages - If specified in the ind
15、ividual specification, voltage shall be applied specified. * to the specimen during the exposure period: magnitude and points of application shall be as EIA 186-1E 78 m 3234600 0028558 4 W RS-186-1 E Page 2, 2.6 Post-Conditioning - After removal from the chamber, the specMens shall have their surfac
16、e moisture removed by circulating air at room temperature or by wiping with a clean cloth or both. The specimen shall then be allowed to thermally stabilize under the standard conditions of test. shall be made, The period of stabilization shall be not less than 1 hour nor more than 2 hours unless ot
17、herwise specified. The method of measurement shali be as shown in the detailed component standard. 2.7 Final Measurements - At the completion of a period of thermal stabilization, final measurements 3. SUMMARY The following details shall he specified in the individual specification: 3.1 Preconditioning requirements if standard conditions (2.2) are not applicable. 3.2 Initial measurements after preconditioning (2.2). 3.3 Exposure duration (2.3) if other than 10 days. 3.4 Magnitude of voltage and points of application, if applicable (2.5). 3.5 Final measurements after exposure (2*7).
