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 in any life cycle stress analysis, the pated stresses experienced by the hardware each mode should be evaluated and the significant of these incorporated in the programme. It is important that the level and time of application of the vibration be kept to a minimum.
JSS 55555 – Antifungal Test – Electronics
The chamber shall be capable of achieving in its working space, the rate of change of temperature as required in 3. Drops of liquid condensate accumulating on the wallsceiling and other parts of the chamber shall not fall on the equipment under test. Initial Jss see clause 4. All the test instrumentation should be kept in ante room.
The time for transfer shall not exceed 6 minutes, unless otherwise specified. Step 3 – Repeat step 2 with the test item resting on other faces until it has been dropped for a total of four times on each face which the test item could be placed practically during servicing. Power supply to DUT and test, instrumentation should be from different phases and through suitable isolation transformers.
Distance from nose of equipment along axis of equipment in inches. Any condensed water from js walls and roof the chamber jsss not fall on the equipment.
Prior to final resonance search term it may be necessary to provide a period of time in which to allow the equipment to attain the same conditions as existed at the commencement of the initial resonance search for example, as regards temperature.
The low frequency range may need extended below 20 Hz for those equipment which have a low frequency response and for tests where an isolator system is included with the equipment. To assess equipment suitability for its intended operational environment.
Procedure 1 The equipment under test, while being at the laboratory atmospheric conditionsshall be introduced into the acid spray chamber js, the latter also being under the same conditions. 011 equipment under test while being under the laboratory atmospheric conditionsshall be introduced into the alkaline spray chamber the latter also being under the same conditions.
Conditioning – Two procedures are specified procedure transportation.
JSS – Antifungal Test – Electronics | Situ Biosciences LLC
De Barry Arnaud Baininer Thom. It is checked functionally and examined for any frequency dependent effects such as mechanical resonances and malfunctioning. The stiffness of the mounting fixture shall be such that it induced resonant frequencies are as high as possible but none are below one-third of any of frequencies.
The equipment shall be mounted on the centrifuge as in clause jws.
Manufacturers techniques sometimes inadvertently alter the design; assembly procedures leave room for mistakes; all these would result in creeping of substandard workmanship and human error. Where the effect of gravitational force is not important, the equipment may be mounted in any altitude.
The equipment shall then ;be allowed to drop back freely to the horizontal wooden bench 0526. Deviation from the planned test programme.
If these are to be used only with the remainder of the main equipment, the impact machine shall have weights mounted on the target approximately kg. The duration of the test and the amplitude shall be as specified and shall be selected from severities given in 4.
Final Measurements – The equipment shall then be visually examined and shall be subjected to electrical, mechanical and other checks as specified. Transverse Motion – The positive or negative peak acceleration at the monitoring point perpendicular to the intended direction 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. The mounting fixtures shall be such as to enable the specimen to bevibrated along the various axes specified for conditioning.
Measurements see clause 3. The salt mist chamber or a humidity chamber shall be used for the storage of the equipment under test for exposure to the conditions specified in 3.
The missile system shall be electrically and mechanically checked as specified. Small items will be tested to higher levels during transit 011. Procedure The equipment under test while being in laboratory atmospheric conditions shall be introduced into the chamber the latter also being under the same condition.