GE Corometrics 250 Series, Service Manual, Page: 109 / 252

Revision D 250 Series Maternal/Fetal Monitor 4-29
2020551-001
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 US connector on the monitor.
2. Set the switches on the Model 325 Input Simulator according to Table 11 .
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.
‹
The strip chart recorder immediately reflects this new input rate.
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