Guide to Operation
34
Changing Operating Mode
Press and hold the HIGH RATE and LOW RATE buttons. Turn
the control knob until the desired value appears in the PULSE
RATE display.
C-LOCK ECG Synchronization
WARNING: An ECG monitor output that is delayed by
more than 40 milliseconds from the actual QRS complex
may prevent the N-200 from calculating and displaying
saturation or may display inaccurate measurements. If
this condition is observed, disconnect the patch cord
and use the N-200 without C-LOCK ECG synchroniza-
tion, or substitute a different ECG monitor, or connect
the patient ECG leads directly to the connector on the
NELLCOR C-13-200 or C-20-200 patient module.
To provide reliable saturation measurements in a high-motion
environment or when a patient has poor perfusion, the N-200
can use an ECG (R-wave) signal to identify the pulse and
synchronize the saturation measurements.
Connecting the ECG Signal
The N-200 monitor can receive an ECG signal either directly
from the patient by a conventional three-lead ECG cable
connected to a patient module connection, or from a bedside
ECG monitor by the proper patch cord. For proper operation,
only a Nellcor-approved three-lead ECG cable from the
monitored patient should be connected to a C-13-200 or
C-20-200 patient module ECG connector. Do not connect any
other signal, such as the output from an ECG monitor, to this
connector.
Signal Requirements
For signals from a bedside ECG monitor, the peak of the ECG
signal must be between 0.5 and 15volts. The QRS complex
must be at least 10 milliseconds wide at 50% of peak
amplitude. To ensure optimal performance, the output signal
should be delayed by no more than 40milliseconds from the
actual QRS complex. For direct, patient-connected ECG
signals, the R-wave amplitude must be between 0.5 and
5.0millivolts.
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