Electronic Restoration >> How To Clean An Electronic Circuit Board After It

In comparison with semiconductor devices, MnO2-based tantalum capacitors are generally considered to be insensitive to radiation. Small shifts of roughly 10 mV/krad (Si) are observed in the open-circuit voltage of previously discharged capacitors, but this effect is transient and generally only of interest in high impedance, How To Clean An Electronic Circuit Board After It small-signal circuits. 

However, tantalum capacitors are rarely used in such circuits, even when radiation is not of concern. Moreover, radiation-generated oxide defect concentrations for doses in excess of 10 Mrad (Si) are estimated to be orders of magnitude lower than intrinsic defect levels and How To Clean An Electronic Circuit Board After It are not thought to significantly impact long-term performance or reliability. 

Since the same dielectric anddielectric thickness are employed in tantalum polymer capacitors, these devices are expected to be similarlyinsensitive to radiation effects.Vacuum impacts tantalum polymer capacitors in two ways. Convection is eliminated as a coolingmechanism and How To Clean An Electronic Circuit Board After It all internal moisture will be lost via diffusion through the plastic case.

Because a significant cooling mechanism is lost, higher device temperatures are expected in vacuum forsimilar levels of power dissipation. This is equally true for capacitors with MnO2 and conductive polymercathodes. However as previously discussed, How To Clean An Electronic Circuit Board After It the conductivity of the polymer cathode begins to degrade atlower temperatures than are true for MnO2. 

Thus, careful attention must be paid to thermal design to avoidchronically exceeding peak temperature ratings, a condition which can increase ESR and capacitance rolloff.The second impact of vacuum is that all internal moisture will eventually be lost via diffusion through theplastic case. As previously discussed, How To Clean An Electronic Circuit Board After It it is expected that the DC leakage current of tantalum polymer capacitors will rise somewhat as the moisture level falls. 

However, no clear connection has been madebetween this effect and loss of long-term reliability, so it appears that this effect is only of concern whenproper circuit operation depends on very low and stable DC leakage current. However, How To Clean An Electronic Circuit Board After It almost all tantalumpolymer capacitors are used in power circuits where increases in leakage current that remain belowspecification limits are not generally of significant concern.

Path ForwardThe FY06 task will involve competitive testing of representative tantalum polymer capacitors. Directcomparisons will be made of similar part types from multiple vendors, How To Clean An Electronic Circuit Board After It and appropriate contrasts will bedrawn against MnO2-based capacitors of similar capacitance and voltage ratings. Results of thiscompetitive evaluation will be published in FY06 as the phase-two NEPP task deliverable for this project.

Connector Section C2, General Section, added new paragraphs 5), 6), and 7) on Page 2.5) Prohibited connectors. The following connectors are prohibited for Level 1 and Level 2applications. The following connectors are not recommended for Level 3 applications. The How To Clean An Electronic Circuit Board After It screening and qualification tables that follow do not apply to connectors listed as prohibited.a. 

CompactPCI® connectors and 2.0mm Hard Metric connectors, as well as otherconnector designs (e.g. Eurocard, VME) with flat bifurcated "tuning fork" type femalecontacts.b. Other connector contact systems having two (2) points of contact engagement, or less, How To Clean An Electronic Circuit Board After It that do not utilize a military style hood "clamping" mechanism to support female contact engagement tines.c. 

Connectors with compliant pin "press fit" terminations to flight boards.d. MIL-DTL-55302/ 131 through 134 Eurocard type PWB connectorse. MIL-DTL-55302/ 157 & 158 VME type PWB connectorsf. All MIL-C-28754 & MIL-A-28859 modular connectors How To Clean An Electronic Circuit Board After It and assembliesg. All MIL-DTL-32234 blade and fork connectorsh. 

All DSCC drawing high density blade and fork connectors 6) Connectors used in Level 1 and Level 2 space flight applications shall employ an approved, How To Clean An Electronic Circuit Board After It high reliability contact system such as those approved by the NPSL. 

Examples may includeconnectors with a hood "clamping" mechanism surrounding the female contact How To Clean An Electronic Circuit Board After It engagement tines such as those typically used with circular military socket contacts or the reverse gender "bulgedwire twist" pin used with microminiature (Micro-D) style connectors. 

Connectors used inLevel 3 applications should also employ similar contact systems as those approved for Levels 1and 2. Other contact systems shall be reviewed with the project parts engineer and parts controlboard prior to use.7) When CompactPCI® architecture is desired for flight applications, How To Clean An Electronic Circuit Board After It connectors shall be procured to the NASA GSFC S-311-P-822 specification, from a source of supply specified onthe GSFC QPLD. 

Connector Section C2, Table 1A, Notes, add new note 1.5.1.5 The listing of a military or NASA specification in this table does not imply that all variantsof this detail drawing or How To Clean An Electronic Circuit Board After It specification are acceptable for use in flight applications. Therequirements of this table do not apply to prohibited connectors. Please refer to the Generalsection for connectors, note 5).

Connector Section C2, Table 1B, Notes, add new note 1.3.1.3 The listing of a military or NASA specification in this table does not imply that all variantsof this detail drawing or How To Clean An Electronic Circuit Board After It specification are acceptable for use in flight applications. Therequirements of this table do not apply to prohibited contacts. Refer to the General sectionfor connectors, note 5). 

Since its founding, NASA has been dedicated to theadvancement of aeronautics and space science. TheNASA Scientific and Technical Information (STI)Program Office plays a key part in helping NASAmaintain this important role.The NASA STI Program Office is How To Clean An Electronic Circuit Board After It operated byLangley Research Center, the lead center forNASA’s scientific and technical information. 

TheNASA STI Program Office provides access to theNASA STI Database, the largest collection ofaeronautical and space science STI in the world.The Program Office is also NASA’s institutionalmechanism for disseminating the results of itsresearch and development activities. These resultsare published by NASA in the NASA STI ReportSeries, How To Clean An Electronic Circuit Board After It which includes the following report types: 

TECHNICAL PUBLICATION. Reports ofcompleted research or a major significant phaseof research that present the results of NASAprograms and include extensive data ortheoretical analysis. Includes compilations ofsignificant scientific and How To Clean An Electronic Circuit Board After It technical data andinformation deemed to be of continuing referencevalue. 

NASA’s counterpart of peer-reviewedformal professional papers but has less stringentlimitations on manuscript length and extent ofgraphic presentations. TECHNICAL MEMORANDUM. Scientific andtechnical findings that are preliminary or ofspecialized interest, e.g., How To Clean An Electronic Circuit Board After It quick release reports,working papers, and bibliographies that containminimal annotation. Does not contain extensiveanalysis. CONTRACTOR REPORT. Scientific andtechnical findings by NASA-sponsoredcontractors and grantees.

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The second observation is that the first breakdown for the tantalum polymer capacitors occurs at 1.75 times rated voltage. This is roughly twice as high as the lowest voltage seen for the MnO2-based capacitors.While the precise numerical value of this advantage varies somewhat with manufacturer and   read more..

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