Revision B 120 Series Maternal/Fetal Monitor 6-31
2015590-001
Functional Checkout Procedure: Dual Heart Rate Test (Non-Pattern)
Dual Ultrasound Modes
As stated previously, the dual ultrasound mode of the 120 Series Monitor cannot be
tested unless two Model 325 Simulators are used or two Model 116/118/120
ultrasound transducers. Do not attempt to test dual ultrasound using one Model 325
Simulator and one ultrasound transducer. This procedure details using two
transducers since it is more practical for a test site.
1. If not already on, depress the monitor’s
Record pushbutton.
2. Plug one ultrasound transducer into the monitor’s
US input receptacle and the
other into the monitor’s
US2 receptacle. Verify the following on the monitor:
The FHR1 mode shows US.
The FHR2 mode shows US2.
The FHR1 value shows three steady dashes “– – –.”
The FHR2 value shows three steady dashes “– – –.”
The recorder prints the messages US and US2 on the center margin of the
strip chart paper.
3. Use your finger to rub the face of the ultrasound transducer connected to the
monitor’s
US input receptacle; try to maintain a steady rate and verify the
following on the monitor:
The FHR1 value responds to the rubbing.
The FHR1 heartbeat indicator ( ) responds to the input.
The recorder prints the heart rate tracing corresponding to the rate and the
trace is plain black ( ).
4. Use your finger to rub the face of the ultrasound transducer connected to the
monitor’s
US2 input receptacle; try to maintain a steady rate and verify the
following on the monitor:
The FHR2 value responds to the rubbing.
The FHR2 heartbeat indicator ( ) responds to the input.
The recorder prints the heart rate tracing corresponding to the rate and the
trace is plain black ( ).
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