ADC 657 User Manual page 5

4. Operation
Binaural positioning
CORRECT INCORRECT
Adjusting spring tension
To reduce the tension, grip the binaurals firmly using both hands with fingers at the
center of the "Y" in the tubing, thumbs at each side where the tubing branches out.
Flex binaurals gradually until the desired tension is obtained. To increase the tension,
grip the binaurals in the hand and squeeze the binaural tubes together gradually.
Excessive adjustment of the spring tension could weaken the spring.
Power ON/OFF
Press the one-touch soft power button lightly to turn the ADC
Green LED will light. Holding down the the power button for 1.5 seconds turns off the
ADC ® 657, and the Green LED will go out. The ADC
minutes of last activation. Depressing any button extends "power on" time by 3 minutes.
Volume control
During auscultation, press the volume button "
press the volume button "
eight levels.
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The ADC ® 657 electronic stethoscope is designed to provide comfortable
ear fittings and the best sound transmission, considering morphology of
the outer ear canal. The binaurals (ear tubes) are angled at 15° to permit
a comfortable, acoustically sealed aural fit. Eartips should point
forward, towards the bridge of the nose to fit properly. The ADC ® logo
on the battery compartment should be visible by the patient.
® 657 stethoscope on. A
® 657 turns off automatically after 3
'' to increase the sound level, and
'' to decrease the volume. The volume level is divided into
2.
Features
Main features of the ADC ® 657 electronic stethoscope
• Improves low frequency sound transmission characteristics with the use of a piezopolymer film contact microphone.
• MPU controlled automatic power-off.
• Mode selection (Bell, Diaphragm, Wide).
• 8-level digital volume control.
• Memorizes the mode and volume of the previous operation.
• Ergonomic design for comfort.
An acoustic microphone used in most electronic stethoscopes may have frequency characteristics not suitable for
body sounds, especially for the low frequency heart sounds. Other stethoscopes provide the internal body sounds not
directly from the body surface, but through the air layer between the body surface and the microphone.
The ADC ® 657 solves those problems with the use of its piezopolymer
film contact microphone, which is at the heart of the ADC ® 657.
The ADC ® 657 has wide frequency characteristics, enabling you to
detect the heart and lung sounds more precisely.
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