Bare board test a-la-carte

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Report on latest equipment from Mesrs ATG Electronic GmbH, Germany who offer modular construction, Finger-type probe tester is shown and use of rubber translator offers advantages.

Bare board test: do you know what you are getting ?

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Comments on printed circuit board testing suggests use of known good board is useful approach while testing to Gerber data can fail if data has been corrupted in handling. Testing vs. original CAD data avoids corrupted Gerber problems but outcome will be known only after fabrication. Further option is to check manufacturers CAD data vs. original before fabrication.

Bare board testing - fingerprober at its best

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Details of bare board tester, www.atg-test-systems.de with 16 test heads - asks if parallel tester is now on the way out ?

Bare facts about part stripping

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Various stripping methods are outlined considering chemical stripping, high pressure water blast, hot media, cryogenic pelletised solid carbon dioxide, blasting with various media, and burn-off. Companies to contact for various methods are listed.

Barium Acetate to Treat Chromium Plating Effluent to Precipitate Chromate

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Barium strontium titanate deposition

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Method comprising selectively delivering liquid precursor(s) by vaporizer through by-pass line connect to exhaust system to stabilise vaporisation process; and selectively delivering precursor(s) to deposition chamber to deposit film on substrate.

Barium titanate films synthesized by an anodic oxidation-based electrochemical method

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SURF Barium titanate films were synthesized by anodic oxidation galvanostatically in an electrolyte of 0.5 M Ba(CH3COO)2 with 2 M NaOH. The films were first prepared using a wide constant current range from 5 to 40 mA. XRD results showed that rutile TiO2 was present at 10 mA and cubic BaTiO3 films could be obtained at currents over 20 mA. The Ti anodes were then electrolysed at constant current of 30 mA with various deposition times from 0.5 to 4 h. XRD results showed that TiO2 existed at 0.5 h and BaTiO3 appeared at electrolytic times over 0.75 h. From the XRD results associated with the variations of electrolytic voltage with time, rutile TiO2 has been found to be a precursor for the formation of BaTiO3. BaTiO3 films with uniformly distributed small grains were formed at voltages over 60 V and below the dielectric breakdown voltage. The formation mechanism could be due to dissolution and crystallization. BaTiO3 films with large crater shaped grains were present when voltages reached a dielectric breakdown voltage, which could be due to anodic spark deposition.

Barrel and centrifugal polishing equipment. Limitations of vibratory and other methods

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Trends in barrel and centrifugal polishing are discussed.

Barrel blasting of small items rediscovered

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Suggests that though BB might not be a new idea, the latest equipment brings many advantages. Damage to delicate parts can be minimised using barrels with special modes of rotation of movement. Comments on the blast media impellers and recycling of media

Barrel Centrifugal Finisher

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Barrel Chromating

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Barrel Chromium Plating from Trivalent Electrolyte

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Factorially designed trials examined optimum barrel design & solution comp'n, focussed on conforming anodes. Deposition rate of "2 to 4 millionths/min" is quoted. 13 refs.

Barrel cleaning

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Workpieces are cleaned in barrel with rotary, centrifugal spiral of vibratory motion using abrasive medium and organic acid compound, e.g., acetic acid containing condensate of dibasic acid and complexing agent.

Barrel Cleaning & Plating Unit

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Barrel cleaning method

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Device for cleaning containers with fitting comprising riser pipe with pair of passages, cleaning fluid being introduced into container, turbulence being periodically created in liquid by introducing pressurized fluid at point below level of liquid and gas being released from container above surface level to limit pressure to pre-selected level.