Testing The Ir Led; Figure 13: Red Led High Light Setting - Nellcor OxiMax SRC-MAX Technical Manual

Note:

Testing the IR LED

1. Turn on the signal generator.
2. Adjust the signal generator output until there is -475 to -
3. Select the Low Light setting on the SRC-MAX.
4. Measure the peak-to-peak voltage across the 1 meg ohm
SRC-MAX

Figure 13: RED LED High Light Setting

The peak-to-peak voltage tolerance includes a
possible probe impedance error.
525 millivolts peak across the 10 ohm resistor (R1 in
Figure 11).
resistor (R2 in Figure 11) on Channel 2 of the
oscilloscope. The peak-to-peak voltage should be 600 to
900 volts peak-to-peak . See Figure 14.
Performance Verification
25