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USB Power Sensors

Doug Millar K6JEY. USB Power Sensors. Old Style Meters. Good Points Thermistor Sensor could cover a wide frequency range. The HP 8487A= 10mhz- 50ghz 50DB range Accuracies of <1% in some cases Very simple and portable Bad Points Meter and sensor have to be calibrated and zeroed.

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USB Power Sensors

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  1. Doug Millar K6JEY USB Power Sensors

  2. Old Style Meters • Good Points • Thermistor Sensor could cover a wide frequency range. The HP 8487A= 10mhz- 50ghz • 50DB range • Accuracies of <1% in some cases • Very simple and portable Bad Points • Meter and sensor have to be calibrated and zeroed. • Sensor has to be calibrated for frequency • No data management easily done.

  3. So What are They • The new HP model is pretty typical • Good points • Internal calibration for zero, temperature and frequency • Wide dynamic range -60 to +20 DBM • All RF and A/D done in the head • Extensive data management • Can be remoted • Can run for days recording power measurements. • Can be integrated into other test gear- only a software problem.

  4. More • Bad Points • More limited frequency ranges available • Won’t work without a computer • Expensive and not surplus yet. About $5K • >2% accuracy

  5. How do they work? • Added multiple sensors for greater power range on the same chip • At least one CPU and EPROM in the head. • The head zeros, offsets for temperature, selects frequency range and digitizes the output level. • Cal. data is stored in non volatile memory.

  6. Then What? • The computer program receives the reading or stream (20samples/sec) • Displays the results in a scalable analog display, a digital display and a continuum display • Readings can be averaged, stored displayed and exported. • The meter can take and store measurements over time.

  7. Conclusions • Older power sensors are cheap and very usable in most circumstances. They offer a wide frequency range and need considerable set up time. • Newer sensors are more plug and play, can record data over time, and digitize results. • Which one? Depends on your applications.

  8. The Beginning • Resources: • Hp Sensor • Anritsu Sensor

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