GE Corometrics 250 Series, Service Manual, Page: 111 / 252

Revision D 250 Series Maternal/Fetal Monitor 4-31
2020551-001
Maintenance: Fetal Movement Detection Test
Ultrasound Ramp
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” on page 4-32.)
1. Connect the simulator’s US cable to the
US
connector on the monitor. Select the
FHR2 mode field. Ensure
FM Detect
is
On
.
2. Set the switches on the Model 325 Input Simulator according to Table 12 .
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
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 are shown on for a duration of 1 second,
then off for 8 seconds, then on for 1 second, etc.
‹
The recorder prints the messages
US
and
FMD
on the center margin of
the strip chart paper after approximately 20 seconds.