Electronic Restoration >> Learn Smoke Damage Electronic Restoration

Class H is the standard military quality level in the MIL-PRF-38534 specification.(3) Class G is a lowered confidence version of the standard military quality level (H) with QML listing per MIL-PRF-38534. It features a lowered temperature range (-40 °C to +85 °C), a manufacturer guaranteed capability to meet the Class H conformance inspection and periodic inspection testing, Learn Smoke Damage Electronic Restoration and a vendor specified incoming test flow. 

The device must meet the Class H requirements for in-process inspections and screening.(4) Class E designates devices that are based upon one of the other classes (K, H, or G) with exceptions taken to the requirements of that class. These exceptions are specified in the device acquisition document; therefore, Learn Smoke Damage Electronic Restoration the device acquisition document should be carefully reviewed to insure that the exceptions do not adversely affect the performance of the system.(5) 

Class D is a vendor specified Learn Smoke Damage Electronic Restoration quality level available to MIL-PRF-38534 t specification. This is a reduced temperature range (0° C to +70° C) part with a vendor specified test flow available from a QML listed manufacturer.(6) Non-QML indicates a hybrid microcircuit device that is not listed in the QML-38534 document. 

Every hybrid is unique in its design and application. The requirements within this section may notbe sufficient, depending on the specific device construction, mission life Learn Smoke Damage Electronic Restoration and reliability goals of theproject. Project parts engineer in close coordination with design engineer shall ensure that the appropriate requirements for each application are included in the procurement, screening andqualification of these parts. 

Hybrid classes G,E, and D are not listed here because the vendors used by NASA programs are not interested in supplying Learn Smoke Damage Electronic Restoration parts to these class levels. Any use of hybrid classes G, E, and D requires permission on a case by case basis from the project.2/ Plastic encapsulated hybrid microcircuits are not covered in this section. 

Refer to Section M4 for PEMs (Plastic Encapsulated Microcircuits) requirements.3/ Acceptable for use as a level 1 part only when a Class K part is not available.4/ Non-QML hybrid microcircuits are not recommended for use in level 1 applications, Learn Smoke Damage Electronic Restoration and a SCD is required if a Class K or H part is not available. 

SCDshall meet all requirements as specified in Tables 2 and 3.5/ For non-QML hybrid microcircuits ( i.e. parts not currently listed in QML-38534), the successful completion of a manufacturer’s facility audit Learn Smoke Damage Electronic Restoration and / or asurvey is required prior to the placement of any flight procurements.6/ Non-QML hybrid microcircuits for level 2 and level 3 shall be procured using a user-controlled procurement specification or source control drawing. 

The procurement specification or SCD shall meet all requirements of Tables 2 and 3. Pure tin plating is prohibited as a final finish in EEE components2/ The lot may be accepted on any of the five runs if the percentage of defective devices is less than 1 percent or one device, whichever is greater. All defective devices shall be removed after each run. Lots that do not meet the 1 percent PDA on the fifth run, Learn Smoke Damage Electronic Restoration or exceed 25 percent defectives cumulative,shall be rejected for use as level 1 and level 2 devices.3/ 

For level 1 hybrids, the burn-in shall be equally divided into two successive burn-ins i.e. 160 hours pre seal and 160 hours post seal. 4/ Interim electrical tests shall be performed after the first burn-in to determine acceptable devices for the second burn-in .5/ All rework/repair on non-QML hybrids for level 1 applications must be fully documented and Learn Smoke Damage Electronic Restoration shall meet MIL-PRF-38534 Class K rework/repairrequirements.6/ 

All rework/repair on non-QML hybrids for level 2 and 3 applications must be fully documented Learn Smoke Damage Electronic Restoration and shall meet MIL-PRF-38534 Class H rework/repair requirements.7/ X-ray may be performed at any step in the sequence after PIND test. These requirements apply to all non-QML hybrids procured through SCDs for level 1 and 2 applications.2/ 

Test at 25 °C for the following electrical characteristics (minimum):a) Resistors: DC resistanceb) Capacitors: 1) Ceramic: Dielectric withstanding voltage, insulation resistance, capacitance and dissipation factor.2) Tantalum: DC leakage current, capacitance, Learn Smoke Damage Electronic Restoration and dissipation factor.3) Metal Insulation Semiconductor: DC leakage current, capacitance, and dielectric withstanding voltage.c) 

Inductors: DC resistance, inductance, and quality factor. For hybrid devices, derating guidelines are divided into two categories: derating of componentsused in hybrid design and Learn Smoke Damage Electronic Restoration manufacture, and derating for applications in which the part is used.These guidelines are provided as follows:1. 

Derating of components used in hybrid design and manufacture:• Derating analysis for existing hybrid devices that are qualified to MIL-PRF-38534 is not required. Custom hybrids shall be designed such that all internal components comply with theelectrical and Learn Smoke Damage Electronic Restoration temperature derating requirements set forth in this document for the specificcommodity device types (i.e., diodes, capacitors, etc.). 

Derating analysis shall be reviewedand approved by the project PCB.2. Application derating for hybrids:A. General requirements for all applications and all device types: Specific electrical parameter derating shall be based on the requirements set forth for similar microcircuit device types. Case temperature derating shall be 75% of the maximum rated case temperature specified bythe manufacturer or 80 °C, Learn Smoke Damage Electronic Restoration whichever is lower. 

Special requirements for high temperature applications Learn Smoke Damage Electronic Restoration and high power hybrids (ex: DC-DCconverters): Additional derating beyond the general requirements stated above may be required in order toprevent localized device overheating within the hybrid, and shall be tailored on a case-by-case basisto account for the application temperature and power dissipation needs. 

Such derating analysis isrequired and shall be submitted to PCB for review and approval. This section covers hermetically sealed Monolithic Integrated Circuits only. For Plastic Encapsulated Microcircuits(PEMs) , Learn Smoke Damage Electronic Restoration refer to Section M4. Monolithic Integrated Circuits shall beselected for the applicable program class or grade level in accordance with Table 1. 

Table 1 alsoindicates screening and qualification testing required for each part designation when applied to thevarious program classes or Learn Smoke Damage Electronic Restoration grade levels. The part designations are discussed below:(1) Class V, Q, S, and B. These designations include parts that are procured as "Class V,”"Class Q,” "Class S,” or "Class B” as defined in MIL-PRF-38535; are tested to MIL-PRF-38535 Tables Ia, II, III, IV, and V, as well as Appendixes A (and B, if applicable); and arelisted in Part I or Part II of QML-38535.

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Four-ply board is the thickness most often used for matting. Larger works of art or those with undulations or raised elements such as seals may require a thicker board for the window portion of the mat. Boards heavier than four-ply are available from conservation suppliers, or they can be made by la  read more..

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