GE Corometrics 250cx Series, Service Manual, Page: 103 / 252

Revision C 250cx Series Maternal/Fetal Monitor 4-23
2036947-001
Maintenance: FECG Test
FECG Test
This portion of the functional checkout procedure ensures the integrity of the FECG
circuitry and the heart rate channel of the recorder.
1. Connect the simulator’s ECG cable to the
FECG
connector on the monitor’s “Y”
adapter cable.
2. Connect the simulator’s UA cable to the
UA
connector on the monitor.
3. Set the switches on the Model 325 Input Simulator according to Table 2.
4. If not already on, depress the monitor’s
Record
button.
5. Turn the simulator’s
Manual Adjustment
knob counterclockwise and verify the
following on the monitor’s display:
‹
The FECG value is 30 bpm.
‹ The FECG mode is
FECG
.
‹ The FECG heartbeat indicator ( ) flashes at a rate of 30 times per minute.
‹
The UA mode is
TOCO
.
6. Depress and hold the monitor’s
UA Reference
button and release when the UA value
shows 10 relative units in mmHg mode or 1.3 kPa in kPa mode. Verify the following
on the monitor:
‹
The UA value is referenced to 10 mmHg (1.3 kPa) on the display.
‹ The recorder prints a continuous line at 10 mmHg (1.3 kPa) on the bottom
grid of the strip chart paper.
‹
The recorder prints the messages
UA REF
on the strip chart paper.
7. Turn the simulator’s
Manual Adjustment
knob to input an FECG signal of
approximately 120 bpm. Verify the following on the monitor:
‹
The FECG value is 120 bpm.
‹
FECG heartbeat indicator ( ) flashes at a rate of 120 times per minute.
‹ The ECG “beep” volume of the rear panel speaker can be increased or
decreased using the left pair of
Volume
buttons. (Set the volume to the
desired level.)
‹
The recorder prints a continuous line at 120 bpm on the
HR
grid of the strip
chart paper.