6-18 170 Series Monitor Revision C
2000947-004
Functional Checkout Procedure: Ultrasound Transducer Test
Ultrasound Transducer Test
1. Inspect a Model 116/118/120/170 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 170
Series Monitor.
3. Connect the ultrasound transducer to either
US input receptacle on the front
panel of the monitor. Verify the following on the monitor:
The value shows three steady dashes “– – –” in the FHR1 display.
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.
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 and heartbeat indicator are both 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.
ABOUT LATCHING ALARMS
The fetal heart rate alarms are latching alarms which means that
a clinician must acknowledge the alarm using the monitor’s
Alarm Silence button in order to clear the alarm.
Active Threshold Alarm: Press the Alarm Silence button to
cancel the audio component of an active threshold alarm. The
visual indications remain present until the FHR value returns to
within the defined acceptable range. (This is tested in steps 14
to 16 for a high alarm, and steps 22 to 24 for a low alarm.)
Unsilenced, Resolved Threshold Alarm: If a threshold alarm
condition is resolved, prior to be silenced (clinical
acknowledgement), the visual and audible indications both
remain present. Press the Alarm Silence button to cancel both
the audible and visual indications. (This is tested in steps 17 to
19 for a high alarm and 25 to 27 for a low alarm.)
NOTE: For continuous limit violations: a high alarm activates
after 5 minutes; a low alarm activates after 30 seconds.
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