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Essential Guide to Electronics Lab Techniques and Safety Protocols

This comprehensive guide provides essential electronics lab techniques and safety protocols for students. It covers the basics of equipment usage, such as voltmeters, soldering iron care, and maintaining lab books. Key topics include proficiency demonstrations, optical mount assembly, and testing of mounts for stability. Learn important soldering skills, op-amp debugging tips, and how to properly align optical components in various setups. Ensure safety and skill in electronics with expert advice and best practices for lab work and machine operation.

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Essential Guide to Electronics Lab Techniques and Safety Protocols

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  1. Course status

  2. Course materials • Lab access • Everyone should have • lab book • proto board • voltmeter • jumper wires • resistor card • Write name on yours • maintain -- example battery in voltmeter

  3. Electronics maintenance tips • Voltmeter has battery • turn off when not in use • Soldering iron corrodes if left on all night

  4. Course status - basics • Enough to get started in lab • Machine safety • Mount assembly • Optics cleaning • Mach Zender alignment • Basic electronics -- diff amp, integrator • Soldering • Lab book writeups of above skills

  5. Next step • Proficiency demonstrations • like test questions • if done correctly -- full credit • otherwise -- partial credit • compare to others to be sure same performance gets same grade • Written tests • first test is sample -- next class period

  6. Lab proficiency demos • Second optical mount assembly • Construct and align interferometers • Michaelson • Sanac • etalon • white light interferometer • Iris alignment • Others ? • Spatial filter • Confocal etalon • Acousto optics setup • Fabry-Perot filter setup • Stabilize laser intensity using simple servo • acousto-optic shifters, VCOs • Lock optical spectrum analyzer (Fabry-Perot) to laser • lock-in amplifiers and ac servos, etc. • Construct servo box • design and packaging of special-purpose electronics • Optimize both servos and Bode plots

  7. Soldering • Steps to get good joint • Melt drop of solder on iron • Contact work • Flow solder directly on both work pieces • can “tin” in advance • Last action • contact with fresh flux • can be in fresh solder • Too much solder ? • remove with pump or wick • Learn to be fast -- heat damage can result

  8. Op amp debugging tips • Check dc voltage at key pins of op amp chip • Pin 4 = -15 V, Pin 7 = +15 V • if not, check power supply, grounding • Pin 6 (output) • if greater than +/- 10 V -- saturated ? -- check inputs • Pin 2 (+ input) = ground (or reference voltage) • if not, connect • Pin 3 (- input) = pin 2 • if not -- saturated, output load impedance, bad op amp • Saturated ? • Check voltage at each resistor connected to summing junction • set to zero ? • Feedback path closed ? -- short integrator • Check ac voltage at pin 6 • MHz oscillation ? -- add capacitors on power leads • above 1 micro Farad -- electrolytic -- observe polarity

  9. More machining • Second set of mounts • learn tool change • tool sharpen (lathe) • machine setup an tear down • cleanup • Testing of mounts • stability -- nothing loose or vibrating • operation -- knobs and levers work • far field test (mirrors)

  10. screen marks Laser beam laser mirror Long distance screen Far field test -- mirrors • Deflect laser beam with mirror • send long distance • shine on card and mark position • test alignment and stability

  11. Iris 1 Iris 2 Optical sub-assembly Mirror 2 Mirror 1 Input Iris alignment • Align optical sub-assembly • interferometer ? • Place irises in position • one close to second mirror • the other far from second mirror • Disturb input laser beam alignment • Reset alignment using only input mirrors and irises • first center on close iris (1) using mirror 1 • then center on far iris (2) using mirror 2 • iterate

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