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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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An auto miser jes compressed air, which is free from all impurities, shall produce the salt spray. The conditioning shall be as per Table 4. The relevant equipment specification shall define the acceptable performance limits during and after the specified environmental tests.

AT In reality, materials and processes often do not work on the designers expectation. The heaters are controlled so as to supply the system with the calculated heat input as a function of time.

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. Conditioning – The equipment to be tested shall in all casebe in a condition representative of operational use.

Unless otherwise specified, the total duration shall be equally divided for 10 at each frequency in each of the three axes of the equipment. Equipment deployed in submarines. Whether gravitational effects are significant See 3.

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The maximum vibration amplitude at the fixing points of the equipment in any direction normal to the intended including that due to rocking, torsional vibration ,etc. Recovery see clause 3. If cables, pipes 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. For sealed equipment this test may be applied only to components and finishes located outside the seal.

JSS_ – [PDF Document]

The dust shall conform to the following requirements. The duration of operation of equipment and time mss which this operation should be commenced see 3. The temperature range may be extended beyond these limitsup to 10 c to 40 c for large equipment. The resistance of EEDs has to be checked fro change in resistance or pre-mature ignition.

Unless otherwise specified the duration shall be equally divided on all axes. Accuracy – The accuracy of measuring system shall be such that it determines the true value with the given tolerance.

The preferable method is to heat it to a temperature of c, in a moisture saturated atmosphere for 1 hour. Likelihood of problems disclosure by the test methods.

JSS 55555 – Antifungal Test – Electronics

The isolators then shall be removed and the test item rigidly mounted and subjected to the test level indicated. Basic Pulse Shapes – The bump shall be capable of generating a pulse approximating to one half cycle of a sine wave as shown by dotted lines in fig.

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Simulation of Precalculated surface temperature.

Performance checks see 3. The device shall be circulated for 5 minutes and the dust shall be allowed to settle down.

A sufficient quantity of dust shall be available in the chamber originally in order to give the specified dust concentration throughout the chamber. Typically, ten ;discharges at a vulnerable point are considered adequate.

The ground plane should be grounded and better than one ohm impedance id desireable. Procedure 1 The equipment under test, while being at the laboratory atmospheric conditionsshall be introduced into the acid spray chamberthe latter also being under the same conditions.

JSS_0256-01

With reference to Fig. The equipment under test shall be subjected to this test in un parked conditions. Conditioning – The equipment under test shall be subjected to this test in its 0265 packed and switched off condition.