Possible Problems and Resolutions
| Problems | Possible Causes | Solution |
| There is no response to the function button. | The button can not be pressed to its position | Ensure that the button is fully depressed. |
| Battery capacities are low | The batteries may be missing, discharged, or oriented incorrectly. Replaced them with new ones. | |
| Battery installation error | Please check whether the positive and negative directions of the battery are consistent with the positive and negative directions of the battery compartment. | |
| The Pulse search time is too long |
Perfusion may be too low | Check the patient. Change the measuring site. Try another oximeter. |
| Patient movement | Interference due to patient activity may be preventing the oximeter from tracking the pulse. Keep the patient still, if possible. | |
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Electromagnetic interference may be preventing the oximeter from tracking the pulse. |
Remove the source of interference. |
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There may be interference due to ambient light, or the oximeter may be on an extremity with a blood pressure cuff, arterial catheter, or intravascular line. |
Reposition oximeter, as necessary. |
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Display is dark-or-bright |
Battery capacities are low. |
Replace the batteries. |
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