Morr While doing so the following are to be considered: The equipment altitude see 3. Perform the required drops using the apparatus of para 3. This requirement is aimed to simulate in a known and repeatable manner, kss effects produced by static electricity discharging into electronics sub-systems from human beings and inanimate objects. 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. The total duration of the simulation shall be 1.
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Morr While doing so the following are to be considered: The equipment altitude see 3. Perform the required drops using the apparatus of para 3. This requirement is aimed to simulate in a known and repeatable manner, kss effects produced by static electricity discharging into electronics sub-systems from human beings and inanimate objects.
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. The total duration of the simulation shall be 1. Un representativecoating and contaminants such as oilsgrease and dirtwhich could affect the adhesion between the ice and the surface of the equipments, shall be removed before commencing the test.
Application Test Method see clause 3. Basic Pulse Shapes — bump shall be nss of generating a pulse approximating to one half cycle of a sine wave as shown by dotted lines in fig.
The equipment shall be subjected to a total of four consecutive cycles as above. JSS — Antifungal Test — Electronics 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.
Final measurements — The equipments shall be operated and a performance evaluation made when the temperature and humidity have returned to standard laboratory conditions.
In additionthe chamber shall also be capable of meeting all the requirements specified for test chamber for the high temperature test Test Number 1 and the low temperature test Test no 2. 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.
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.
If the value thus obtained is greater than Hz, no separates acoustic test is required. External connections necessary for measuring purposes shall add a minimum of restraint and mass. The total duration shall be calculated based upon the estimated vehicle movement. Initial measurements see 3.
Performance checks required se 3. The performance check shall be carried out during the last 30 minute of the period specified. Procedure — Bench handling Step 1 — Configure the item as it would be for servicing for example, with the chassis and front panel assembly from its enclosures. Step 3 — The chamber pressure shall be adjusted to the corresponding to one of the test conditions A1 to A4 Table 4. Severity for each conditioning specified.
For this simulation, real time flight temperature distribution is necessary. The generaised profile is iss to be used as a starting point for a tailored life cycle recesses analysis and to provide confidence that all potentially significant environmental conditions have been considered. Final Measurements — The equipment then jzs be visually examined and shall be subjected to electrical, mechanical and other checks as specified A check may then made by measuring some other parameter which is temperature dependent and for which the law of temperature dependent is known.
Free flight functional test levels and duration see 3. The procedure given in clause 3. Two end blows from a weight of kg, at a radius of 1. During the entire conditioning period the total rms acceleration with the specified frequency range shall be measured and controlled. Conditioning Where the altitude of the equipment when mounted js transported kis known, and since bumps are generally of greatest significance in one direction usually verticalthe specified number of bumps should be applied in each of the directions specified.
Disassemble jxs case of non hermetically sealed equipment see clause 3. The equipment shall be visually examined and shall be subjected to electricalmechanical and other checks as specified. The duration of the test see 3. The test iss shall be prepared by dilution of 5mlstock solution with 95 ml o distilled water it shall be kept in a well stoppered bottle in a cool place and used withn7 days. The acid mist shall freely circulate aground the equipment under test.
Step 7 — Document the results. All the test instrumentation should be kept in ante room. The total number of cycles shall correspond to jes of the following test conditions, as required. Recovery Thee equipment shall then be removed from the chamber and shall be allowed to remain under standard recovery condition a period of 2 to 4 hours.
This shall constitute one cycle. Related Articles.
Malanos 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.
JSS 0256 01 PDF
Two accelerometer shall be mounted one in the vertical and the other in the lateral plane longitudinal direction is the axis of the equipment to monitor the vibration response. Final resonance search The final resonance search shall be performed in the same manner as the initial resonance search. When it is necessary to employ filters to reduce the effect of any high frequency resonance inherent in the accelerometer, it may be necessary to examine the amplitude and phase characteristics of the measuring system in order to avoid distortion of the reproduced waveform3. The alkaline spray shall be produced by an automiser employing compressed air which is free from impurities. In this case, three mutually perpendicular directions are usually adequate. Even then jes will be desirable that the containers with missiles in positions are tested for the altitude and rapid temperature cycling.
Accuracy — The accuracy of measuring system shall be such that it determines the true value with the given tolerance. This wire shall be used to scarp gently the surface of the culture to liberate the spores. The heat input and surface temperature ar eto be calculated as a function of time of mss prescribed variation of h and T taking into account the thermal properties of the missile frame. Spray from the shower headsshall be directed as: For this purposethe volume of the test chamber should preferably be not less than eight times the jsss of the equipment under test.