Nellcor N-200 - Electrical and Environmental

Troubleshooting
82
– 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.
9. When ECG is connected, pulse rate displays but not
saturation.
• 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).
10. Displayed pulse rate does not agree with that of ECG
monitor.
• 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.