JSS 0256 01 PDF

JSS (Revision No. 1) MINISTRY OF DEFENCE JOINT SERVICES SPECIFICATION ON ENVIRONMENTAL TEST METHODS. JSS , knowns as the Penta-Five test, is an antifungal product test for electronics. JSS Revision No. 1. LIST OF MEMBERS ASSOCIATED WITH FORMULATION OF THIS STANDARD. 1. This Joint Services Specification has.

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The total number of cycles shall correspond to one of the following test conditions, as required.

If required the equipment shall be switched on and operated for a specified duration at any ime during this period of exposure. At the completion of the test periodthe equipment shall be subjected to recovery conditions and kss measurement shall be made as specified.

When humidity conditions in the chamber are obtained by using dematerialized water, this shall have a resistively of not less than ohm metres.

The total duration shall be calculated based upon the estimated vehicle movement. The relevant equipment may specify method o removal of surface moisture. The liquid which has come in contact with the equipment under test jas not be allowed mss return to the reservoir containing the solution. Final measurement – The equipment shall be visually examined and shall be subjected to electricalmechanical and other checks as specified. Step 5 – Document the results.

JSS 55555 – Antifungal Test – Electronics

The test frequency spectrum shall be determined for Fig 4. The acid solution to be sprayed shall consists of a solution of sulphur – dioxide in distilled water. For items under 45 kg poundsthe 26 drop requirement may be divided among upto 5 times dropping of the same item if desired, in any combination.

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Test Facility – Drops for equipment mass upto kg pounds and having its largest dimension less than 92 36 inches shall be made from a quick release book, or drop tester. To detect such occurrences all equipment shall undergo acceptance testing.

The design and construction of the chamber shall be such that any heat dissipated by the equipment during testingshall not appreciably influence the conditions within the chamber. For the purpose of measurement of quantity of heat, radiometer may be employed, with due corrections if required. Many times DT is used to generate design data on the system. Recovery The equipment shall sjs be removed from the chamber and shall be jsa to remain under standard recovery conditions.

The acceleration and time duration shall be achieved within the tolerance shown by thick lines in fig. The test items shall be exposed on every surface to the sound field by centrally locating it in the test chamber.

Care must be taken to ensure that no spurious acoustic or vibratory inputs jsa introduced. The equipment shall be mounted in the chamber 026 specified in 3. Whether equipment is to be tested with isolators. Procedure 1 is applicable for all equipment.

JSS_0256-01

This step jss not required if for a one hour endurance testthe test level LO is equal or less than the corresponding captive functional test level. Procedure 2 The equipment under test, while being under laboratory atmospheric conditions shall be introduced into the salt spray chamber the latter also being under the same conditions.

Test conditions A and B may be specified for protected and partially protected equipments. In some of the tests, the test conditions are varied in 001 to enable the designers select the conditions which will be adequate to meet the users qualitative requirementscommensurate with the design efforts.

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From para 2 determine the height of the drops to be performed, the number of drops per test item, and the drop surface. Jxs and control should be through connectors on the test panel provided in between the main room and ante room. External connections necessary for measuring purposes shall add a minimum of restraint and mass.

The results of such tests enable design clearance. Transverse Motion – The positive or 025 peak acceleration at the monitoring point perpendicular to the intended jzs of bumps shall not exceed at any time 30 percent of the nominal value of the peak acceleration in the intended direction, when determined with a measuring system conforming to clause 2.

Accuracy – The accuracy of measuring system shall be such that it determines the true value with the given tolerance. The design and construction of the chamber shall be such that any heat dissipated by the equipment during testing shall not appreciably sjs the conditions within the chamber. The locations where the ESD has to be simulated are identified and the number of discharges are decided.

Maintain the condition for 1 hour. The altitude chamber shall also be capable of maintaining a relative humidity of not less than 95 percent as required for procedure 2.

JSS_ – Documents

The lifted edge of the equipment has been raised mm above the horizontal bench top. In this case, three mutually perpendicular directions are usually adequate. The sweeping shall be continuous and logarithmic, and the sweep rate shall be approximately one octave per minute.