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4-26 250cx Series Maternal/Fetal Monitor Revision C

2036947-001

Maintenance: Ultrasound Test

FECG Artifact Elimination

Ultrasound Test

This portion of the functional checkout procedure ensures the integrity of the

ultrasound circuitry and the heart rate channel of the recorder.

1. Connect the simulator’s US cable to the

connector on the monitor.

2. Set the switches on the Model 325 Input Simulator according to Table 4.

3. If not already on, depress the monitor’s Record button.

4. Turn the simulator’s Manual Adjustment knob to input an ultrasound signal of

approximately 120 bpm. Verify the following on the monitor:

 The FHR1 value is 120 bpm.

 The FHR1 mode is US.

 The FHR1 heartbeat indicator ( ) flashes at a rate of 120 times per minute.

 Ultrasound audio volume from the rear panel speaker can be increased or

decreased using the upper-left pair of Volume buttons. (Set the volume to

the desired level.)

 The recorder prints a continuous line at 120 bpm on the top grid of the strip

chart paper.

 The recorder prints the message US on the center margin of the strip chart

paper after approximately 20 seconds.

5. Use the simulator’s Manual Adjustment knob to increase the heart rate value by

less than 13 bpm from the 120 bpm baseline. Verify the following on the

monitor:

 The FHR1 value immediately reflects this new input rate.

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