Automating hardware test & measurement
summary
A Python datalogger controls a GPIB USB multimeter and an I2C chain via a USB–I2C bridge to sweep a DAC that tunes a digitally controlled ovenized crystal oscillator; measurements are written to CSV with per-step settle, voltage and temperature readings. Hardware includes a quick carrier PCB (breadboards proved useless), an OCXO board, an I2C temp117 sensor (isolator footprint left unpopulated), and a GPIB USB multimeter; code uses Adafruit CircuitPython libraries. DAC linearity shows ~0.1% absolute error (~0.04% relative); frequency closure is unfinished due to counter and PSU failures.
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chapters (7)
- 0:00Introduction
- 1:55Test equipment interfaces history
- 8:25System test equipment and automation
- 10:14I²C as test interface
- 15:11Case study: DAC test setup
- 21:08Automating measurements
- 24:14Q&A
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