4-20 250cx Series Maternal/Fetal Monitor Revision C
2036947-001
Maintenance: MECG Test
5. Insert the green plug of the FECG/MECG adapter cable, cat. no. (REF)
1442AAO, into the monitor’s FECG/MECG connector.
6. Connect the sub-cables of the other end of the simulator interconnect cable into
the color-coded connectors on the monitor/adapter: ECG, US, and UA.
7. Turn on the Model 325 Simulator. Verify that the green Power indicator
illuminates.
8. Turn on the 250cx Series Monitor.
MECG Test
This portion of the functional checkout procedure ensures the integrity of the MECG
circuitry and the heart rate channel of the recorder.
1. Connect the simulator’s ECG cable to the
MECG
connector on the monitor
adapter cable (1442AAO).
2. Connect the simulator’s UA cable to the UA connector on the monitor.
3. Set the switches on the Model 325 Input Simulator according to Table 2.
4. If not already on, depress the monitor’s Record button.
5. Turn the simulator’s Manual Adjustment knob counterclockwise and verify the
following on the monitor’s display until the monitor reads a value of 30 bpm:
The MHR/P mode is MECG.
The MHR heartbeat indicator ( ) flashes at a rate of 30 times per minute.
The UA mode is TOCO.
6. Access the
Install Options Screen 2
and note the
Default TOCO Reference
value. Exit
the service mode by selecting
Restart
at the bottom of the screen.
7. After the monitor restarts, press the monitor’s front panel UA Reference button.
8. Verify the following on the monitor:
The UA value is referenced to the default value.
The recorder prints a continuous line at the default value on the bottom grid
of the strip chart paper.
The recorder prints the message UA REF on the strip chart paper.
9. Turn the simulator’s Manual Adjustment knob until the monitor displays an
MECG signal of approximately 60 bpm. Verify the following on the monitor:
The MHR value is 60 bpm.
The MHR heartbeat indicator ( ) flashes at a rate of 60 times per minute
(1 per second).
The ECG “beep” volume can be heard from the rear panel speaker. The
volume can be adjusted on the MHR/P Setup screen.
Or using the Volume increase/decrease buttons, set HR/PR Trace to On in the
MHR/P Setup screen The recorder should print a continuous line at 60 bpm
on the top grid of the strip chart paper.
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