F9 Fetal & Maternal Monitor • User Manual
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A3.5 Trouble with DECG FHR Monitoring
Error Condition
Possible Cause
Corrective Action
No ECG signal
Use a new spiral electrode
Inconsistent trend
Inconsistent display
Bad contact of reference
electrode and patient
Use a new spiral electrode
Inconstant trend
The DECG cable has not been
attached firmly
Connect an attachment pad at
the DECG cable
A3.6 Trouble with Contractions Monitoring (External)
Error Condition
Possible Cause
Corrective Action
The belt is too tight or too loose
Adjust the belt
The belt has no elasticity
Replace the belt
Maternal movement
Request the patient to reduce
movements
Bad trace quality or
fluctuating TOCO
baseline
Frequent fetal movements
Delay the monitoring
Too high TOCO
sensitivity (higher than
100 unit)
The body pressure from uterus to
TOCO transducer is far higher
than the average value
Confirm good contact to
patient skin with TOCO
transducer. Change the
position of TOCO transducer,
if necessary.
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