Instruction Manual

19
for better interpretation or record the sounds from
some body spots that are not commonly used.
⚫ Choose Stemoscope PRO LITE frequency
modes
The auscultatory sounds can be filtered in three
different frequency modes: bell mode, diaphragm
mode, and extended range mode respectively. The
following table shows the frequency ranges of
these modes.
The Bell mode emphasizes the low frequency
sound, which makes the major part of normal
heart sounds, while the Diaphragm mode
weakens the low frequency sounds, which may
reduce the interference of heartbeat when you
listen to the lung sounds. The Extended range
mode covers the whole frequency range from 20-
2000 Hz. You may switch among these modes
based on your preference. We don’t make
recommendations on what frequency mode
should be used.