Nellcor N-200 Operator's Manual page 43

For each ECG monitor to be used with the N-200, test
instrument and patch cord function on someone as follows.
1. Position conventional disposable ECG electrodes in the
configuration that will be used clinically. (The ECG output
signal must have the characteristics previously described.)
Use the ECG patch cord to connect the appropriate output
of the ECG monitor (ECG out or defibrillator sync) to the
interface/powerbase ECG IN/OUT connector. Turn on both
instruments.
Verify that a normal tracing is displayed on the ECG
monitor; that the pulse rate displayed by the N-200 is
accurate; and that the ECG IN USE indicator lights
steadily. Apply a NELLCOR sensor to that same person,
following the Directions for Use. Connect the sensor to the
NELLCOR patient module, and verify that a saturation
value is displayed by the N-200 and that the ECG IN USE
indicator lights steadily.
2. Test all instrument functions under both normal and alarm
conditions (for example, ECG leads off) to ensure
appropriate operation before clinical use (see the operator's
and service manuals of the N-200 and the external ECG
monitor).
Should problems arise during any test procedure, first check all
connections. If that does not resolve the problem, contact
qualified service personnel or your local Nellcor representative.
Operation with an ECG Signal
The ECG IN USE indicator flashes when the N-200 locates an
ECG signal. When the N-200 locks on to an adequate signal,
the ECG IN USE indicator lights steadily. The ECG R-wave is
then being used to identify the pulse and synchronize
saturation measurements.
Guide to Operation
37