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A low-cost, high-precision scope calibrator. A delayed pulse generator with an isolated output
Pflugers Archiv : European Journal of Physiology
|January 31, 1979
Summary
This study introduces a cost-effective oscilloscope calibrator for precise voltage and time measurements. The device offers isolated, low-impedance output with high accuracy for biological signal analysis.
Area of Science:
- Electronics
- Biomedical Engineering
- Instrumentation
Background:
- Accurate calibration of oscilloscopes is crucial for precise measurement of electronic signals.
- Existing calibrators may be expensive or lack specific features required for biological signal analysis.
Purpose of the Study:
- To develop a simple, low-cost oscilloscope calibrator.
- To provide accurate voltage and time calibration for simultaneous display with biological signals.
Main Methods:
- Design of a square pulse generator with calibrated amplitude and pulse-width.
- Integration of adjustable delay for synchronizing with CRO sweep.
- Implementation of ground isolation and low output impedance.
Main Results:
- Achieved amplitude range of 10 µV–1 V and pulse-width range of 0.2–1000 ms.
- Demonstrated accuracy of less than +/- 1% for both amplitude and pulse-width.
- Exhibited negligible output drift against power supply and temperature variations.
Conclusions:
- The developed oscilloscope calibrator offers high performance at a low cost.
- It utilizes readily available components, facilitating easy construction.
- The device is suitable for accurate calibration in applications involving biological signals.