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.
|Published (Last):||24 February 2014|
|PDF File Size:||12.11 Mb|
|ePub File Size:||8.15 Mb|
|Price:||Free* [*Free Regsitration Required]|
Memuro The quantities listed are mass of salt per liter of water. 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.
Any deviation from thee test procedure. For general test purposes the low frequency limit jjss 5 Hz is acceptable. Final measurement — The equipment shall be visually examined and shall be subjected to electricalmechanical and other checks as specified. Drops of liquid condensate accumulating on the wallsceiling and other parts of the chamber shall not fall on the equipment under test. The temperature of the chamber shall then be restored to laboratory atmospheric conditions.
Minor adjustments may be effected during the conditioning. Separate equipment can be used for this test. Gravitational effect — The relevant equipment specification shall state whether the effect of gravitational force is important. The height of drop shall be measured from the points of the equipment, nearest to the steel plate when suspended prior to dropping.
Details of the operations and performance checks and the terms at which they should be made see 3. However the total duration shall be limited to a maximum of 50 hours Note: These fixtures shall be such as to enable the equipment to be subjected to an acceleration in the direction or directions as specified.
Procedure 1 The equipment under test, while being at the hss atmospheric conditionsshall be introduced into the acid spray chamberthe latter also being under the same conditions. Final measurements — The equipment shall be visually examinedand shall be electricallymechanically checked as specified. Sufficient quantity of dust shall also be introduced into the chamber. The dust shall be by brushingwiping or shaking. Initial resonance search The equipment is vibrated sinusoidal motion over the complete frequencyrangee specified.
If required, the equipment shall be visually examined after each drop. Levels are raised in steps to evaluate performance variation and to obtain failure data. Test items of equipment normally provided with vibration isolators first shall be tested with the isolators in place. The acid mist shall freely circulate aground the equipment under test. Cross country fields with bunds of 20 to 25 cms high for a distance of jzs kms at a speed of 3 to 5 kmph. To assess equipment suitability for its intended operational environment.
Final Measurements — The equipment shall be visually examined and shall be electrically and mechanically checked as specified.
Initial measurements see 3. Initial Measurements see clause 3. 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.
The value of q shall be the maximum value attainable during free flight s. Required thickness of ice 3. Conditioning for operation mode is as specified in table 4.
They should enter the chamber during spraying and the chamber should be purged with clean air to lower the concentration of sulphur dioxide in the air of the chamber to a safe level before it is entered after spraying. The hss shall be sprayed to a total of 10 cycles as above over a period not exceeding 21 days.
The isolators then shall be removed and the test item rigidly mounted and subjected to the test level indicated. In tracked vehicles, vibration some time sever, is excited at frequencies associated with track patter. This is also carried out on sampling basis on the production line for periodical surveillance.
TOP 10 Related.
Post on Nov views. If necessary a suitable respirator should be worn. Distance from of equipment along axis of equipment in inches. Procedure 2 The equipment shall be subjected to this test in its unpacked and switched-off condition. If the equipment is long compared to its width and a single noise source is used, the equipment jsd not be mounted with the long axis in line with the noise source. The lifted edge of the chassis has been raised for inches above the horizontal top.
JSS 0256 01 PDF
Memuro The quantities listed are mass of salt per liter of water. 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. Any deviation from thee test procedure. For general test purposes the low frequency limit jjss 5 Hz is acceptable. Final measurement — The equipment shall be visually examined and shall be subjected to electricalmechanical and other checks as specified. Drops of liquid condensate accumulating on the wallsceiling and other parts of the chamber shall not fall on the equipment under test. The temperature of the chamber shall then be restored to laboratory atmospheric conditions.
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. The total duration shall be calculated based upon the estimated vehicle movement. The relevant equipment may specify method o removal of surface moisture.
Recovery — The equipment shall be allowed to remain under the standard recovery conditions for a period of 2 hours. Lower frequency limit of the spectrum, if lower than Hz see 3. Test conditions — The test item shall be raised at one edge four inches above a solid wooden bench top or until the chassis forms an angle of 45 with the bench top or until point of balance is reached, whichever is less. An agent based on N methyl tauride Igepon or on dioctyl sodium sulphoccinate is suitable. For low acoustic facilities, which can not excite the entire frequency range at one timeit is permissible to break the test into smaller segments.