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All magnetic parts processed to the Class S requirements of MIL-STD-981 are acceptable as level 1 parts. Magnetics processed to Class B requirements of MIL-STD-981 are acceptable as level 2 parts. All level 1 and 2 custom magnetics shall be processed to the Learn Water Damage Electronic Restoration applicable requirements of MIL-STD-981.

In the event, a Class B part is intended for a level 1 application, the additional level test requirements of Tables 2 and 3 are applicable.3/ MIL-PRF-39010 provides for R and P established reliability failure rate levels (FRL). If the FRL "R" coil is not available, Learn Water Damage Electronic Restoration an FRL "P" coil may be usedfor Level 1 applications. Both FRL R and P coils require 100% X-ray per MIL-STD-981. 

Screening in accordance with Table 2 and qualification in accordance with Table 3 are required. Any test required by Tables 2 and 3 that is already performed by the procurement specification (military or SCD) need not be repeated. However, Learn Water Damage Electronic Restoration lot specific attributes data for screening tests, and lot specific or generic attributes data as applicable to various test groups of qualification tests must be submitted to show that tests were performed with acceptable results.5/ 

MIL-PRF-15305 coils shall receive radiographic inspection and burn-in in accordance with MIL-STD-981 for level 2 applications.6/ These parts were formerly available to MIL-T-55631. This Learn Water Damage Electronic Restoration specification was declared as inactive for new design, effective 31 March 1999.7/ Inductors and transformers can be procured to MIL-PRF-27 detail specification (slash sheets) when they are available, provided they satisfy therequirements of Tables 2 and 3 herein. 

MIL-PRF-27 and MIL-PRF-21038 have three product levels. Only levels T and M are acceptable for space flight use, subject to the requirements specified in this table.9/ Parts must be fabricated with wires that meet or Learn Water Damage Electronic Restoration exceed the following minimums for magnet wire and terminations/self leads: Users should refer to the nearest equivalent military specification listed in Table 1 if required for better definition of testing requirements.2/ 

Perform inspection using a microscope with 10x minimum magnification.3/ For level 1 parts with magnet wire less than 30 AWG, measure DC resistance before Learn Water Damage Electronic Restoration and after each cycle.4/ Dielectric withstanding voltage shall be measured at sea level and at high altitude. Test voltage and conditions shall be specified.5/ 

For saturating core, applied voltage shall be two times rated peak to peak voltage at two times rated frequency. For pulse transformers, the applied voltage shall be as specified in Table XIV of MIL-PRF-27.6/ Use a Q meter, impedance analyzer, network analyzer, Learn Water Damage Electronic Restoration or equivalent.7/ For Levels 2 and 3, a rejected lot may be reworked to correct the defects, or screen out the defective units, and be resubmitted for reinspection.

Such lots shall be separate from new lots and shall be clearly identified as reinspected lots. Rework of level 1 lots shall not be permitted unless Learn Water Damage Electronic Restoration approved by the procuring activity (i.e., the GSFC Project Systems Assurance Manager). Transformers shall be subjected to fivelife cycles a week for a minimum of 12weeks, i.e., a total of 2,016 hours. 

Four of these cycles shall consist of a 20 hour period during which the transformers are operated at atemperature of 85 degrees Celsius with electrical conditions as specified in the detail drawing or Learn Water Damage Electronic Restoration specification and a 4 hour period of operation at room ambient temperature without excitation.The fifth cycle of the week shall be a 68 hour period at a temperature of 85 degrees Celsius and a 4 hour period ofexcitation at room ambient temperature.

An electrical test circuit shall be devised so that an open circuit or short circuit during this life cycle test shall bedetected and the time of failure recorded. Upon completion of the lifetest, transformers shall be tested for insulation resistance Learn Water Damage Electronic Restoration and dielectricwithstanding voltage (at reduced voltage). Sample also shall be examined for physical and electrical damage. 

The procuring activity shall be notified within 48 hours of any failures. Maximum operating temperature equals Learn Water Damage Electronic Restoration ambient temperature plus temperature rise plus 10 °C allowance for hot spots. The temperature rise may be calculated in accordance with MIL-PRF-27, paragraph 4.7.13. The formula is:( )( ) t T trR rT + − −−∆ = 234.5 Where:∆T = Temperature rise (in °C) above specified maximum ambient temperature 

R = Resistance of winding (in ohms) at temperature (T+∆T)r = Resistance of winding (in ohms) at temperature (t)t = Specified initial ambient temperature in °C)T = maximum ambient temperature (in °C) at time of power shutoff. (T) shall not differ from (t) by more than 5°C.b. The insulation classes of MIL-style inductive parts generally Learn Water Damage Electronic Restoration have maximum operating temperature ratings based on a life expectancy of 10,000 hours.

The derated operating temperatures Learn Water Damage Electronic Restoration are selected to extend the life expectancy to 50,000 hours at rated voltage.c. Custom made inductive devices shall be evaluated on a materials basis to determine the maximum operating temperature. Devices with temperatureratings different from the military insulation classes shall be derated to 0.75 times maximum operating temperature.2/ 

MIL-PRF-21038 has a maximum operating temperature range of 130 C. For MIL-PRF-83446, refer to the detailed specification sheet for the maximum operating temperature. This Section covers hermetically sealed hybrid microcircuits, Learn Water Damage Electronic Restoration multi-chip modules (MCMs), andsimilar devices as defined in MIL-PRF-38534, General Specification for Hybrid Microcircuits. 

ForPlastic encapsulated hybrids, refer to Section M4.MIL-PRF-38534 allows the device manufacturers the flexibility of implementing the best commercial practices to the maximum Learn Water Damage Electronic Restoration extent possible while providing a product that meets militaryneeds. Devices compliant to this specification are built on a manufacturing line that is controlled bythe manufacturer's quality management program.

The hybrids shall be selected for applicable program class or grade level in accordance with Table1. Table 1 also lists screening Learn Water Damage Electronic Restoration and qualification testing required for each part designation whenapplied to various program classes or grade levels. Additional testing may be required for DC-DCpower converters depending on vendor reliability history and problems/failures experienced inprevious NASA programs. 

Also, 3D MCMs are considered a special class of hybrids / MCMs towhich all requirements in Table 1 apply, Learn Water Damage Electronic Restoration and additional testing may be required, depending onapplication environment. The various hybrid classes are defined below:(1) Class K is the highest reliability level provided for in the MIL-PRF-38534 specification. It isintended for space applications.

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