Nellcor N-200 Operator's Manual page 88

Troubleshooting
9. When ECG is connected, pulse rate displays but not
saturation.
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10. Displayed pulse rate does not agree with that of ECG
monitor.
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– The input signal from the ECG monitor may be
incorrect. Use high level (0.5 to 15 V) ECG analog
output or defibrillator sync pulse wave.
– AC power to the N-200 may have been interrupted.
– An ESU may be interfering. Refer to discussion in
Item 7.
Check the patient.
The sensor may be improperly applied or connected;
check it. The patient's perfusion may be inadequate;
test the monitor on someone else; try another sensor
(see the NELLCOR Sensors section for suggestions).
Excessive patient motion may be making it impossible
for the N-200 to find a pulse pattern. If possible, keep
the patient still; check whether the sensor is applied
securely and properly and replace if necessary; use
C-LOCK ECG synchronization; move the sensor to a
new site; use a sensor that tolerates more motion; or
set the N-200 for Mode 3.
The patient may have a pronounced dicrotic notch,
which causes the pulse rate measurement to double.
Try another sensor site.
If C-LOCK ECG synchronization is in use, an artifact
or low-quality signal may be present on the ECG
monitor. Adjust ECG leads to improve quality of ECG
signal. Refer to the manual for that monitor.
An ESU may be interfering. Refer to discussion under
Item 7.