Fetal Movement Detection Test - GE Corometrics 250 Series Service Manual

Fetal Movement Detection Test

Revision D
Maintenance: Fetal Movement Detection Test
This portion of the functional checkout procedure ensures the integrity of the fetal
movement detection circuitry and the heart rate channel of the recorder. (Refer to
figure "Fetal Movement Detection"
Connect the simulator's US cable to the US connector on the monitor. Select the
1.
FHR2 mode field. Ensure FM Detect is On.
2. Set the switches on the Model 325 Input Simulator according to
If not already on, depress the monitor's Record button.
3.
Turn the simulator's Manual Adjustment knob to input an ultrasound signal of
4.
approximately 120 bpm. Verify the following on the monitor:
The FHR1 value is 120 bpm.
The FHR1 mode is US.
The FMD indication displays in between the FHR1 and FHR2 mode title
locations if alerts are not enabled.
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.
Fetal movement markers
then off for 8 seconds, then on for 1 second, etc.
The recorder prints the messages US and FMD
the strip chart paper after approximately 20 seconds.
250 Series Maternal/Fetal Monitor
2020551-001
on page 4-32.)
are shown on for a duration of 1 second,
on the center margin of
Ultrasound Ramp
Table 12.
4-31