GE Corometrics 250cx Series, Service Manual, Page: 117 / 252

Revision C 250cx Series Maternal/Fetal Monitor 4-37
2036947-001
Maintenance: Alarm Test
Model 325 Simulator and one ultrasound transducer. This procedure details using
two transducers since it is more practical for a test site.
2. If not already on, depress the monitor’s
Record
button.
3. Plug one ultrasound transducer into the monitor’s
US
input connector and the
other into the monitor’s
US2
connector. Verify the following on the monitor:
‹
The FHR1 mode shows
US
.
‹ The FHR2 mode shows
US2
.
‹
The FHR1 value shows three steady dashes “– – –.”
‹ The FHR2 value shows three steady dashes “– – –.”
‹
The recorder prints the messages
US
and
US2
on the center margin of the
strip chart paper.
4. Use your finger to rub the face of the ultrasound transducer connected to the
monitor’s
US
input connector; try to maintain a steady rate and verify the
following on the monitor:
‹
The FHR1 value responds to the rubbing.
‹ The FHR1 heartbeat indicator ( ) responds to the input.
‹
The recorder prints the heart rate tracing corresponding to the rate and the
trace is plain black ( ).
5. Use your finger to rub the face of the ultrasound transducer connected to the
monitor’s
US2
input connector; try to maintain a steady rate and verify the
following on the monitor:
‹
The FHR2 value responds to the rubbing.
‹ The FHR2 heartbeat indicator ( ) responds to the input.
‹
The recorder prints the heart rate tracing corresponding to the rate and the
trace is bold black ( ).
Alarm Test
This portion of the test ensures the integrity of the audio alarms and tests the alarm
limit software.
1. Connect the FECG/MECG adapter cable to the
FECG/MECG
input connector on
the 250cx Series Monitor.
2. Connect the Model 325 Simulator’s ECG cable to the adapter’s
MECG
input.
3. Use the Trim Knob control to access the
MHR/P Setup
screen.
4. Set the MHR/P source to
MECG
.
5. Set the MHR/P high alarm limit value to 120 bpm.
6. Set the MHR/P low alarm limit value to 60 bpm.
7. Set the alarm volume to a level you can easily hear.
8. Exit the
MHR/P Setup
screen.
9. Access the
Master Alarm Setup
screen.