Oscilloscope conversion for biopotential measurements

W. Morton Caldwell, Thomas R. Ebeling, R. P. Patterson, L. C. Stradal

Research output: Contribution to journalArticlepeer-review


A convertor to adapt general-purpose or obsolete oscilloscopes for biopotential measurements has been designed. This device consists of complete vertical and horizontal circuits to drive directly cathode-ray-tube delection plates. Vertical sensitivity ranges from 0·1 to 10 mV/cm and sweep speeds from 0·5 s/cm to 0·1 ms/cm. The linear-sweep sawtooth waveform is generated by an analogue integrator, which is reset by a vertical or external-input trigger signal. The circuits use low-cost operational amplifiers for design simplicity.

Original languageEnglish (US)
Pages (from-to)500-505
Number of pages6
JournalMedical & Biological Engineering
Issue number4
StatePublished - Jul 1973


  • Oscilloscope
  • biopotential
  • differential amplifier
  • sweep circuit


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