Sensor Calibration (Internet)

Detection and monitoring of the Valsalva Wave in real time is an evolving science. For this reason, Sensor Calibration instructions are not yet "embedded" in the instrument.

When correct, the Pulsewave (heart beat) should be consistently detected and the Valsalva Wave average should be "flat", i.e. not drifting downward continuously.

- Attaching: The Sensor should be attached as loosely as possible while still detecting the pulse. After attaching, check Get Started, Basic Signals to make sure the Pulsewave is being detected. You may note that it is possible to attach the sensor such that the Valsalva Wave is detected but the pulse is not. This is because the Valsalva Wave is larger, slower, and easier to detect than the smaller, faster pulsewave. Heart Rate is derived from the Pulsewave, so if the Pulsewave is in error, Heart Rate will be in error.

- Drift Kit: A "drift kit" (see photo) is normally installed when the ear sensor is shipped. It consists of a small plastic block and a rubber band that secures it to the ear sensor. The block prevents "biological" drift due to continuous squeezing of the ear by the ear clip spring. The block keeps the ear clip blocked open such that it does not squeeze past the point where the sides of the clip are parallel. This solves the drift problem but leads to a looser fit and therefore requires additonal care in attaching it to a part of the ear where it fits well. As long as the sensor picks up the AC Pulsewave signal (see Basic Signals), then it is secure enough.

Click the "Calibrate Sensor" tab on the Navigation Bar to return.

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