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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Restrictions – This test should not be used if it can be demonstrated that the shocks from the transit drop test are of a higher level.

JSS – Antifungal Test – Electronics | Situ Biosciences LLC

The input level shall be sufficient to excite vibration response. Rationale – Levels for this test were set by considering how a field equipment item might commonly be dropped. Drops of liquids condensate accumulating on the walls, ceiling and other parts of the chamber shall not fall on the equipment under test.

The over all sound pressure levels SPL corresponding to typical application are given in table 4.

JSS_0256-01

The equipment shall jsd subjected to a total of three consecutive cycles as above. All the test instrumentation should be kept in anteroom communication and control should be through connectors on the test panel provided in between the main room and ante room.

Captive flight endurance test levels and duration of test see 3. For low acoustic facilities, which can not excite the entire frequency range at one timeit is permissible to break the test into smaller segments.

In each jsss planeposition here microphonesdegrees apart, around the equipment. During the visual examination of the equipment, defects in construction, the presence of foreign bodies, moisture, dust ,etc. The equipment while being under the laboratory atmospheric conditions shall be exposed to the aerodynamic heating either by simulating the precalcualted heat input sec 2. The overriding arm of the 50 hours endurance test is that every resonance frequency which will be encountered in service shall be subjected to a 50 hours appropriate to that frequency range82JSS The sum of the duration specified in the most severe category and 026 equivalent durations calculated sjs above shall be the total duration for which the equipment shall be subjected to at the ASD level corresponding to the most severe category.

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The locations where the ESD has to be simulated are identified and the number of discharges are decided. Equipment intended for use in an environment where bumping takes place for example, in moving vehiclesshall be fastened by its normal means of attachment, unless otherwise specified. To meet the above objectives the tests should 02256 tailored taking into account the life cycle condition that is likely to be encountered by any specific missile system.

The equipment shall then be exposed to the alkaline mist with the spray operating for a period of 2 hours under the laboratory atmospheric conditions. At the end of this periodjxs test item shall to the extent possiblebe visually inspected for presence of deterioration which would impair future operation.

Rubber gloves should be used to handle equipment. Any deviation from the normal test procedure. In the event that all free flight functional checks are made during captive functional tests levels are lager than or equal jws those desiredno free flight functional test is required. Characteristics of the Shock Machine When the equipment together js its supporting brackets and any other load for test purposes are mounted on the shock machine, the applied shock shall, at the monitoring point, have following characteristics.

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In such cases the value shall be noted and stated in the test report. The light edge of the equipment is just below the point of perfect balance. The volume occupied by the equipment under test shall not exceed 10 percent of the volume of the chamber.

The equipment shall then be removed from the chamber and shall be examined for corrosion and deterioration of metal partsfinishesmaterialscomponents and contact materials. The equipment shall then be removed from the chamber and shall be examined for corrosion and deterioration of metal partsfinishes, materialscomponents and contacts jsss.

CONTROL Iss test is controlled by measurements made at reference point and control points related to the fixing points of the equipment. Hence, a frequency range may be swept continuously, changing from constant displacement to constant acceleration or constant velocity and vice versa at the crossover frequency.

Conditioning – The tyre pressure of the wheeled transport vehicle shall be adjusted for tactical js road cross country service.

Procedure 2 The equipment under test jsss, while being under laboratory atmospheric conditionsshall be introduced into the acid spray chamber ,the latter also being under the same conditions. Duration of exposure, if other than 45 minutes see 3. Conditioning The equipment under test shall be subjected to this test in its unpacked and switched off condition.

Test Conditions – Test levels for this test are shown in Table.