3M Littmann 3200 Manual page 7

5. Select Filter
This electronic stethoscope allows the user to select between three different digital frequency fi lters to better emphasize the
specifi c patient sounds of interest.
• The Bellmode amplifi es sounds from 20 - 1000Hz, but emphasizes lower frequency sounds between 20 - 200Hz.
• The Diaphragm mode amplifi es sounds from 20 - 2000Hz, but emphasizes the sounds between 100 - 500Hz.
• The Extended Range mode amplifi es sounds from 20 - 2000Hz similar to the Diaphragm Mode, but provides more
low frequency response between 50 - 500Hz.
The default setting is the Diaphragm fi lter. Instructions for changing the default fi lter setting are given in the Custom
Confi guration section below.
To select fi lter: Depress and release fi lter button (as shown in diagram) until desired fi lter mode appears on the LCD display.
Extended
Range Mode
Icon
6. Adjust Sound Amplifi cation Level
The Model 3200 sound level can be amplifi ed in 8 increments up to 24X amplifi cation of a non-electronic (cardiology-level)
stethoscope. Level 1 is equal to a non-electronic stethoscope. Level 9 is equal to 24X amplifi cation of a non-electronic
stethoscope. The greater the amplifi cation, the more bars you will see.
A default start-up amplifi cation level can be set using the instructions provided in the Custom Confi guration section below.
The default setting is marked by the box on the vertical bar shown in the volume icon in the LCD display. The illustration
shows a default amplifi cation setting at Level 3.
• Increase Amplifi cation: Press ( + ) button until desired amplifi cation level is achieved
• Decrease Amplifi cation: Press ( - ) button until desired amplifi cation level is achieved
Bell
Mode
Icon
6
Diaphragm
Mode
Icon