GE Corometrics 126, Service Manual

Page: 199 / 440

Revision B 120 Series Maternal/Fetal Monitor 6-21
2015590-001
Functional Checkout Procedure: Ultrasound Transducer Test
Ultrasound Transducer Test
1. Inspect a Model 116/118/120 ultrasound transducer as follows:
‹
Ensure there are no cracks around the transducer face.
‹ Visibly assess the condition of the cable, strain relief, and connector pins.
2. Disconnect the simulator’s ultrasound cable from the front panel of the 120
Series Monitor.
3. Connect the ultrasound transducer to either the
US
or
US2
input receptacle on
the front panel of the monitor. Verify the following on the monitor:
‹ The FHR1 value shows three steady dashes “– – –.”
‹
The FHR1 mode is US .
‹ The recorder prints the message
US
on the center margin of the strip chart
paper after approximately 20 seconds.
4. Gently rub each crystal of the ultrasound transducer rhythmically. (There are
nine crystals. Eight are arranged around the circumference of the transducer;
one is in the center.) Verify the following:
‹ Good sensitivity is apparent.
‹
The monitor’s FHR1 value follows the input rate.
‹ The recorder follows the input rate.
‹ The FHR1 heartbeat indicator ( ) flashes for each input.
‹
The FHR1 mode shows US .
‹ Ultrasound audio is heard coming from the monitor’s rear panel speaker.
5. Disconnect the ultrasound transducer from the front panel of the monitor.
Verify the following on the monitor:
‹ The FHR1 value, mode, and heartbeat indicator are all 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.