Figure 16: 3 Volts Peak-To-Peak At 3 Hz - Nellcor OxiMax SRC-MAX Technical Manual

Performance Verification
4. Connect the oscilloscope positive lead to the phone
5. Adjust the oscilloscope for 3 volts peak-to-peak at 1 Hz.
.
Note:
6. The pulse width of the signal should be 50 to 100
7. Select 200 BPM on the SRC-MAX.
8. Adjust the Oscilloscope for 3 volts peak-to-peak at 3 Hz.
28
plug's tip and the ground to the sleeve.
See Figure 16.

Figure 16: 3 Volts Peak-to-Peak at 3 Hz

The period of the signal should be 0.96 to 1.04
seconds.
milliseconds.
See Figure 17.