Students Generating and Analyzing Electronic Signals, San Francisco State College (Alternate View) (Updated last month)

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Two students work together at an electronics bench, adjusting equipment to generate signals while observing waveform patterns on an oscilloscope. One manipulates controls on the instrument while the other follows along, capturing a collaborative moment of hands-on instruction in signal measurement and analysis.

Tags: faculty, staff, and administration , historic technology , students and alumni

Added to SFSU Over the Years on July 31, 2026.

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Students and Faculty Working Through a Real-World Engineering Simulation Student Testing Audio Circuit in Electronics Laboratory, San Francisco State College Professor Robert Thornton Demonstrating Electronic Equipment to Students, San Francisco State College Student Operating Oscilloscope in Electronics Laboratory, San Francisco State College Professor Robert Thornton Demonstrating Electronic Equipment to Students (Alternate View), San Francisco State College

Information

  • Identifier: TP-ATA-1863
  • Context: <p><strong data-start="153" data-end="193">Main Device in Front (center-right):</strong></p> <h5 data-start="194" data-end="230"><strong data-start="194" data-end="230">Tektronix Type 561A Oscilloscope</strong></h5> <ul data-start="231" data-end="466"> <li data-start="231" data-end="287"> <p data-start="233" data-end="287">A highly respected analog oscilloscope from the 1960s.</p> </li> <li data-start="288" data-end="346"> <p data-start="290" data-end="346">The screen is showing a <strong data-start="314" data-end="326">waveform</strong>&mdash;likely a sine wave.</p> </li> <li data-start="347" data-end="406"> <p data-start="349" data-end="406">Used to visualize voltage signals over time in real-time.</p> </li> <li data-start="407" data-end="466"> <p data-start="409" data-end="466">Multiple knobs: vertical gain, sweep speed, trigger, etc.</p> </li> </ul> <h5 data-start="473" data-end="531"><strong data-start="479" data-end="531">Black Device Sitting on Top of the Oscilloscope:</strong></h5> <h6 data-start="532" data-end="589"><strong data-start="532" data-end="589">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;General Radio Company Type 874-D R.F. Unit or similar</strong></h6> <ul data-start="590" data-end="821"> <li data-start="590" data-end="628"> <p data-start="592" data-end="628">A <strong data-start="594" data-end="627">signal generator or RF bridge</strong>.</p> </li> <li data-start="741" data-end="821"> <p data-start="743" data-end="821">These were used to analyze circuit response over a range of radio frequencies.</p> </li> </ul> <h5 data-start="1028" data-end="1081"><strong data-start="1035" data-end="1081">Rack-mounted Devices (left side of image):</strong></h5> <p data-start="1082" data-end="1144">These are <strong data-start="1092" data-end="1123">electronic test instruments</strong>, probably including:</p> <ol data-start="1145" data-end="1418"> <li data-start="1145" data-end="1216"> <p data-start="1148" data-end="1216"><strong data-start="1148" data-end="1171">Function Generators</strong> &ndash; Generate sine, square, and triangle waves.</p> </li> <li data-start="1217" data-end="1284"> <p data-start="1220" data-end="1284"><strong data-start="1220" data-end="1242">Frequency Counters</strong> &ndash; Measure the frequency of input signals.</p> </li> <li data-start="1285" data-end="1344"> <p data-start="1288" data-end="1344"><strong data-start="1288" data-end="1317">Amplifiers or Attenuators</strong> &ndash; Control signal strength.</p> </li> <li data-start="1345" data-end="1418"> <p data-start="1348" data-end="1418"><strong data-start="1348" data-end="1366">Power Supplies</strong> &ndash; Provide regulated voltage to circuit experiments.</p> </li> </ol> <p data-start="1420" data-end="1539">Most likely made by <strong data-start="1440" data-end="1459">Hewlett-Packard</strong>, <strong data-start="1461" data-end="1478">General Radio</strong>, or <strong data-start="1483" data-end="1496">Tektronix</strong>, based on knob layout and faceplate style.</p> <p data-start="1420" data-end="1539">&nbsp;</p> <p><strong>Credits:</strong>&nbsp;</p> <p>Some technical descriptions and historical interpretations were developed with the assistance of ChatGPT, an AI language model by OpenAI.</p>
  • Geographic Coverage: San Francisco, CA
  • Type: Still Image
  • Format: Negative
  • Source: San Francisco State University Archives
  • Rights: Public

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