Electronic Restoration >> How To Restore Flood Damaged Electronics

This table represents a limited listing of connector types that have been used in space applications with acceptable results, and consequently are known as preferred. The listings in this table are limited and do not encompass the entire spectrum of all military or space grade connectors that are available. 2/ NASA - MSFC connectors are specially processed for How To Restore Flood Damaged Electronics outgassing control. 

Military connectors require additional processing for outgassing control when used in applications where cleanliness must be maintained. 3/ The use of SMA connectors with captivated How To Restore Flood Damaged Electronics center contacts and safety wire holes is recommended for RF applications. 4/ For radio frequency applications, the use of TNC and N series connectors is discouraged due to moisture corrosion and atomic oxygen corrosion concerns of the silver plating.

5/ Application notes for MIL-STD-1553 Data bus connectors 5.1/ Military databus connectors have silver plate finish that is not recommended for space flight due to atomicoxygen corrosion How To Restore Flood Damaged Electronics concerns. Some military suppliers offer an electroless nickel plated space grade equivalentthat is preferred. P/N selection to accommodate preferred databus cable M17/176-00002 is recommended.

5.2/ Tool crimp versions of these connectors require How To Restore Flood Damaged Electronics separate procurement of a calibration gage to calibrate dieplacement in open frame crimp tools. Consult the manufacturer for proper gage and availability.5.3/ TRT series connectors with threaded couplings are preferred for improved shell to shell shielding andcontinuity.

6/ Metal shell connectors are preferred over plastic.7/ A. GSFC specifications S-311-P-4 and S-311-P-10 should be used as the How To Restore Flood Damaged Electronics first choice where lowest residual magnetism levels are required. Connectors shall be ordered by the GSFC part number.B. MIL-DTL-24308 Class D connectors (general purpose, /1 to /4, /23, /24) have nickel finish, but do not havenon-magnetic properties. 

Class G connectors are not permitted.C. MIL-DTL-24308 Class M connectors (space grade, /5 to /8, /23, /24) have gold plated shells with How To Restore Flood Damaged Electronics nonmagnetic properties. For Class N connectors, only finish P (passivated stainless steel) is permitted. Class Gconnectors (/23 and /24 only) are not permitted.

MIL-DTL-24308 /23 and /24 contain a nylon or nylon-steel right angle bracket, which may require processing for contamination control due to material outgassing. 8/ Coaxial and How To Restore Flood Damaged Electronics databus connectors that require assembly are designed to accommodate specific size cables. 

Use of cables smaller than the connector design was intended to accommodate, is prohibited, and will likely result inimproper connector assembly, improper cable support and high probability of conductor breakage or pullout How To Restore Flood Damaged Electronics and failure. Connectors procured to military specifications or NASA specifications flagged with this note normally have this test performed on samples. 

Unless otherwise specified, this test does not need to be repeated, How To Restore Flood Damaged Electronics except as deemed necessary by user's receiving inspection.2/ For Level 1 programs, Dielectric Withstanding Voltage (DWV) and Insulation Resistance (IR) tests shall be performed on each lot of flight connectors.These tests are normally performed on a sample basis. 

For critical applications, a 100% inspection is recommended. All NASA MSFC connectors andMIL-DTL-38999 military connectors already meet this requirement without additional testing. For solder type connectors, How To Restore Flood Damaged Electronics test adapters or special test jigsmay be required. For this reason, the use of manufacturer's test facilities is recommended in lieu of user's facilities.

3/ Residual magnetism3.1/ For non magnetic connectors and contacts, nickel shall not be used due to magnetic properties. Tests require the use of specialized test equipment How To Restore Flood Damaged Electronics and should be performed at the manufacturer's facilities. There are four industry accepted levels of residual magnetism: 20,000 Gamma, 2,000 Gamma(Level "A"), 200 Gamma (Level "B") and 20 Gamma (Level "C"). 

Only levels B and C are qualified to GSFC S-311-P-4 or S-311-P-10. When residual magnetism levels of 20 Gamma are required, each connector must be tested. The test procedure in GSFC S-311-P-4 Paragraph 4.5.4 How To Restore Flood Damaged Electronics or S-311-P-10 Paragraph 4.5.5 shall apply. Level "B" is guaranteed by use of non magnetic materials and no further screening is required.

3.2/ In order to verify nonmagnetic properties at the user's incoming receiving and inspection facilities (optional), How To Restore Flood Damaged Electronics the following go-no-go test is suggested: Crimp removable nonmagnetic contacts and nonmagnetic connectors shall be checked for their nonmagnetic properties by exposing them to a mild magnetic field. 

A permanent magnet may be used. Any devices that are attracted to the magnet, shall be rejected. After testing, connectors and contacts that are processed for 20 Gamma (Level "C"), How To Restore Flood Damaged Electronics shall be demagnetized in a field of 1500 Gauss strength, min, for not less than 2 seconds.Performance of this test is not intended as a substitute for screening to specific levels of residual magnetism that is performed at the manufacturer's facilities.

4/ Contact Gold Plating.4.1/ For military contacts, How To Restore Flood Damaged Electronics SAE-AS39029 (Contacts, Electrical Connectors) requires a minimum plating thickness of 50 microinches (1.27 micrometers) per ASTM-B488 (Supersedes MIL-G-45204.) This is the minimum requirement for Level 1 / 2 programs, and preferred for Level 3 programs.

4.2/ Plating thickness shall be measured using Microscopic cross sectioning, Beta backscatter or X-ray fluorescence methods described in ASTM-B488(Gold Coating). Due to the specialized test equipment required to perform this test, How To Restore Flood Damaged Electronics use of manufacturer's testing facilities is preferred.5/ For MIL-DTL-83513 Microminiature connectors and DSCC 94031 

Nanominiature connectors with crimp type pig tail leads, adjacent leads shall be testedfor shorting prior to DWV. Each lead shall be tested. For Microminiature DWV testing, a test potential of 600 VRMS (sea level) shall be used. For Nanominiature connectors, 250VRMS (sea level) shall be used. If the manufacturer can certify that this test is normally performed on each connector, How To Restore Flood Damaged Electronics additional testing is not required.

6/ Low level signal contact resistance.6.1/ Purpose. Experience has shown occasional problems with microminiature type or PWB type connectors with straight or How To Restore Flood Damaged Electronics formed lead terminations orsoldercups that are crimp or weld joined to the contact body. Low level signal contact resistance is intended to test for unacceptable welds or crimp joints.

Not to be confused with socket contact engagement sleeve and contact body. When unsure, contact vendor for construction type used in PWB connectors). Procedure. Unless otherwise specified, How To Restore Flood Damaged Electronics all contacts in each connector sample shall be measured. For best results, precondition temperature cycling isrecommended. 

Measurements can be performed using a micro-ohmmeter and four wire measurements. Mated connector pairs are recommended. Attach current leads at extreme ends of mated connector contacts. Attach voltage leads inside the current leads on contact closest point to dielectric insert. If necessary, How To Restore Flood Damaged Electronics needle probes may be used. 

Apply one milliamp DC or as specified. Measurement shall not exceed 15 milliohms for size 22 contacts, 25milliohms for size 24 contacts terminated to size 25 solid wire or soldercups, 32 milliohms for size 24 terminated to size 26 AWG wire pigtails, 70 milliohms for size 30, or as otherwise specified.7/ For critical applications, How To Restore Flood Damaged Electronics perform DWV on each printed circuit connector. Otherwise perform on two connector samples.

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