4-30 250cx Series Maternal/Fetal Monitor Revision C
2036947-001
Maintenance: Uterine Activity Test
The recorder prints the message US on the center margin of the strip chart
paper after approximately 20 seconds.
4. Gently rub each crystal of the ultrasound transducer rhythmically. (There are
nine crystals. Eight are arranged around the circumference of the transducer;
one is in the center.) Verify the following:
Good sensitivity is apparent.
The monitor’s FHR1 value follows the input rate.
The recorder follows the input rate.
The FHR1 heartbeat indicator ( ) flashes for each input.
The FHR1 mode shows US.
Ultrasound audio is heard coming from the monitor’s rear panel speaker.
5. Disconnect the ultrasound transducer from the front panel of the monitor.
Verify the following on the monitor:
The FHR1 value, INOP mode, and heartbeat indicator are all blank.
The recorder stops printing the fetal heart rate trace.
The recorder prints the message CARDIO INOP on the center margin of the
strip chart paper after approximately 20 seconds.
Uterine Activity Test
This portion of the functional checkout procedure tests the uterine activity section of
the 250cx Series Monitor.
1. Set the switches on the Model 325 Simulator according to Table 6,
“Uterine
Activity Test Simulator Settings,”
on page 4-31.
2. Connect the simulator’s UA cable to the UA connector on the monitor.
3. Access the Install Options Screen 2 and select Pressure units: mmHg mode.
4. Access the Install Options Screen 2 and note the Default TOCO Reference value.
(The monitor is shipped from the factory with this value set at 10 mmHg
(1.3 kPa); however, your unit may have been custom configured.) Exit the
service mode by selecting Restart at the bottom of the screen.
5. If not already on, depress the monitor’s Record button.
6. Briefly press the monitor’s UA Reference button. Verify the following on the
monitor:
The UA value is the default setting.
The UA mode is TOCO.
The recorder prints a continuous line at the default value on the uterine
activity channel of the strip chart paper.
The recorder prints the messages UA REF on the strip chart paper.
7. Press and hold the UA Reference button on the monitor to cycle through the
available selections for UA reference: 5, 10, 15, 20, or 25 relative units in mmHg
mode. Test each of these reference settings. Verify that the UA value is
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