4-24 250cx Series Maternal/Fetal Monitor Revision C
2036947-001
Maintenance: FECG Test
8. Repeat
Step 7
for each of the following rates: 30, 60, 210, and 240 bpm.
9. Change the simulator’s QRS Polarity switch from + to –. Verify that the monitor
does not skip any beats.
10. Set the simulator’s ECG Rate switch to the RAMP setting. Verify that the
monitor’s FECG value counts between approximately 30 and 240 bpm and that
the recorder prints a ramp between the same values. (Refer to “FECG Ramp” on
page 4-25.)
11. Access
Install Options Screen 2
and set ECG Artifact Elimination to
Off
; then exit
the service mode by selecting
Restart
at the bottom of the screen.
12. Set the simulator’s ECG Rate switch to the Δ15 position. Verify the following on
the monitor:
The FECG value alternates by 15 bpm.
The FHR1 heartbeat indicator ( ) flashes for each input signal.
The ECG “beep” is heard from the rear panel speaker.
The recorder prints an oscillation of 15 bpm between 110 and 125 bpm on
the top grid of the strip chart paper. (Refer to “FECG Artifact Elimination”
on page 4-26.
13. Repeat Step 12 for rates values of
Δ22 and Δ27. The results should be the
same except that the FHR1 value alternates by either 22 or 27 bpm and the
recorder prints an oscillation of 22 or 27 bpm. The top value is always at
approximately 125 bpm. (Refer to figure “FECG Artifact Elimination” on
page 4-26.)
14. Access Install Options Screen 2 and set the FECG Artifact Elimination to On.
15. Set the simulator’s ECG Rate switch to the
Δ15 position. Verify the following
on the monitor:
The FHR1 value alternates by 15 bpm.
The FHR1 heartbeat indicator ( ) flashes for each input signal.
The ECG “beep” is heard from the rear panel speaker.
Table 3. FECG Test Simulator Settings
Section Switch Setting
FECG/MECG
Rate/CMR RATE
Rate MANUAL
Mode FECG
QRS Amplitude 15 µV
QRS Polarity +
GENERAL Pattern Memory Off
UA
Main CMR
Mode TOCO
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