JSS 0256 01 PDF

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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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Position the item as it would be for servicing. The quantity of solution sprayed per hour shall be approximately one per cent of the volume of jss chamber.

Recovery Thee equipment shall then be removed from the chamber and shall be allowed to remain under standard recovery condition for a period of 2 to 4 hours. Whether visual examination is required at the end of each drop see clause 3. Test Chamber – An enclosure in which the equipment environmental test conditions.

Vibration shall be applies at an input level sufficient to excite vibration response. Initial resonance search The equipment is vibrated sinusoidal motion over the complete frequencyrangee specified.

Final Measurement See 3.

JSS_ – Documents

Characteristics of the Shock Machine When the equipment together with 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.

Static accumulation in the flight due to missile engine charging, precipitation and friction and induced charged due to clouds. When humidity conditions in the chamber are obtained by using dematerialized water, this shall have a resistively of not less than ohm metres. Any periodic change nss temperature shall not exceed 10 rate of 1 c per hour.

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Such instructions, together with the incidence jws grouping of equipments for tests for the purposes of design approval and the acceptance inspection shall be specified in the relevant equipment 001. Unless otherwise specified the peak driving force shall be limited to a level not less than m.

The criteria for failure if other than that specified see clause 3. Step 2 – Using one edge as a pivot, lift the opposite edge of the chassis until one of the following conditions occur whichever occurs first.

The duration and amplitude for each fixed frequency see clause 3. Applicability for a particular equipment is to be decided by the designer in consultation with users and inspection Authority taking all relevant factors into account.

Distance from nose of equipment along axis of equipment jzs inches.

The equipment shall be sprayed to a total of 10 cycles as above over a period not exceeding 21 days. A suitable heater consists of a tungsten filament enclosed by a quartz tube and connected to a controllable electrical supply. The amplitude and duration shall be as specified. In such casesthe actual values used shall be given in the jsss report.

Procedure The equipment shall be conditioned in a low temperature chamber as specified in low temperature test until its temperature has stabilized at level determined by previous experiments, that will permit hard clear ice to form on the item when water jss sprayed upon it.

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Suspend the test item by spring or cords.

JSS_0256-01

The test items shall be exposed on every surface to the sound field by centrally locating it in the test chamber. It is usually continued for at least half an hour after equipment has commenced functioning or performance check is completed whichever is longer.

After this periodthe chamber temperature will be brought back to 55 c. Edgewise be drop test: Conditioning – The equipment under test shall be subjected to this test in un packed conditions. The chamber used for the purpose shall satisfy the requirements specified for Tropical Exposure. Whether gravitational effects are significant See 3. Where called for ,it is the first process in the test procedure. A sufficient quantity of dust shall be available in the chamber originally in order to give the jjss dust concentration throughout the chamber.

To assess equipment suitability for its intended operational environment. Two lateral blows from a weight of kg, at a radius of 1. In this case, the equipment shall be so mounted that the gravitational force acts in the same directions it would 0265 use.

The procedure specified in clause Applicable test conditions depending on altitude ceiling for operation Refer Table 4.