GE Corometrics 250 Series, Service Manual, Page: 110 / 252

4-30 250 Series Maternal/Fetal Monitor Revision D
2020551-001
Maintenance: Ultrasound Test
6. Use the simulator’s
Manual Adjustment
knob to decrease the heart rate value by
more 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 prints at the last input rate for an additional 3
seconds before blanking the heart rate data and printing a continuous line at
the new input rate.
7. Set the simulator’s
US Rate
switch to the RAMP position. Verify that the FHR1
value counts between approximately 50 and 210 bpm and that the recorder
prints a ramp between the same values. (Refer to figure
“Ultrasound Ramp” on
page 4-31.)
8. Place the simulator’s US Rate switch in each of the individual rate settings (50, 60,
120, and 210 bpm). Verify the following on the monitor:
‹
The FHR1 value reflects the simulator setting ± 1 bpm.
‹
The FHR1 heartbeat indicator ( ) flashes at the simulator setting.
‹
Ultrasound audio is heard coming from the rear panel speaker.
‹
The recorder prints a continuous line at the respective value ± 3 bpm on the
top grid of the strip chart paper.
9. Repeat Step 4 through Step 8 using the second ultrasound channel. (The mode
will show US2 .)
10. Place the simulator’s US Mode switch in the Off position. Verify the following
on the monitor:
‹
The FHR1 value and mode are both 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.
Table 11. Ultrasound Test Simulator Settings
Section Switch Setting
US/FMD
Mode US
Signal Level MED
Rate MANUAL
GENERAL Pattern Memory Off
UA
Main CMR
Mode TOCO