Students Generating and Analyzing Electronic Signals, San Francisco State College

Main Device in Front (center-right):

Tektronix Type 561A Oscilloscope

• A highly respected analog oscilloscope from the 1960s.
• The screen is showing a waveform—likely a sine wave.
• Used to visualize voltage signals over time in real-time.
• Multiple knobs: vertical gain, sweep speed, trigger, etc.

Black Device Sitting on Top of the Oscilloscope:

General Radio Company Type 874-D R.F. Unit or similar

• A signal generator or RF bridge.
• These were used to analyze circuit response over a range of radio frequencies.

Rack-mounted Devices (left side of image):

These are electronic test instruments, probably including:

1. Function Generators – Generate sine, square, and triangle waves.
2. Frequency Counters – Measure the frequency of input signals.
3. Amplifiers or Attenuators – Control signal strength.
4. Power Supplies – Provide regulated voltage to circuit experiments.

Most likely made by Hewlett-Packard, General Radio, or Tektronix, based on knob layout and faceplate style.

 Credits: 

Some technical descriptions and historical interpretations were developed with the assistance of ChatGPT, an AI language model by OpenAI.