Maxim Integrated Santa Cruz (MAXREFDES23) - Manual (Page 23)

Santa Cruz (MAXREFDES23#) Quick Start Guide
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24. If your sensor is working correctly, then click on the Maxim sensor device icon
and then the Oscilloscope tab. Press the Play (triangle button) button. Point
the tip of the MAXREFDES23# sensor at the ceiling towards the ceiling lights
for a few seconds and then cover the tip of the MAXREFDES23# sensor with
your hand, as shown below. Verify that the blue and green waveforms go
higher when pointed at the ceiling lights and the waveform goes lower when
covered with your hand as shown in the graph below. This is the 8-bit visual
life test.