The small sawtooth waveform are noises generated by muscle electricity, movement and/or poor conductivity. To minimize noises, please:
- Sit down, keep calm and relax.
- Put hands on table or thigh to relax arms.
- Hold the device gently and steadily, make sure that your finger and palm have a stabilizing contact with ECG electrodes.
- Moisten fingers and/or palm to improve conductivity when necessary. Dry skin or thick stratum corneum affects conductivity.