GE Corometrics 250cx Series Service Manual page 101

Revision C
Maintenance: MECG Test
Table 2. MECG Test Simulator Settings
Section
FECG/MECG
GENERAL
UA
10. Repeat Step 9 for each of the following rates: 30, 120, 210, and 240 bpm.
11. Change the simulator's QRS Polarity switch from + to –. Verify that the monitor
does not skip any beats.
12. Set the simulator's ECG Rate switch to the RAMP setting. Verify that the
monitor's MHR value counts between approximately 30 and 240 bpm and that
the recorder prints a ramp between the same values. (Refer to figure on "MECG
Ramp" on page 4-22.)
13. Set the simulator's ECG Rate switch to the Δ15 position. Verify the following on
the monitor:
The MHR value alternates between two rates 15 bpm apart on the recorder
printout.
The MHR heartbeat indicator ( ) flashes for each input signal.
The ECG "beep" is heard from the rear panel speaker; the volume can be
adjusted on the MHR/P Setup screen.
The recorder prints an oscillation of 15 bpm between 110 and 125 bpm on
the top grid of the strip chart paper. (Refer to "MECG Oscillation" on
page 4-22.)
Repeat Step 13 for rate values of Δ22 and Δ27. The results should be the
same except that the MHR value alternates between two rates 22 bpm or 27
bpm apart and the recorder prints an oscillation of 22 or 27 bpm. The top value
is always at approximately 125 bpm. (Refer to "MECG Oscillation" on
page 4-22.)
Set the simulator's ECG Rate switch to the MANUAL position and the Manual
Adjustment knob to the counterclockwise position. Disconnect the ECG
simulator cable from the monitor's y-adapter cable. Verify the following on the
monitor:
The MHR/P value and Pulse mode are both blank.
The recorder stops printing maternal heart rate data on the strip chart paper.
The recorder prints the message CARDIO INOP on the center margin of the
250cx Series Maternal/Fetal Monitor
2036947-001
Switch
Rate/CMR
Rate
Mode
QRS Amplitude
QRS Polarity
Pattern Memory
Main
Mode
Setting
RATE
MANUAL
MECG
500 µV
+
Off
CMR
TOCO
4-21