STG Stethoscope™

A high quality stethoscope, that has been fitted with the adapter, which adds an electronic sensor to the acoustic tube. Allows examiner to listen acoustically while concurrently recording and displaying heart or lung sounds on the Handheld STG or STG for PC. The STG Stethoscope™ cannot be sold as an independent product. It is only available as part of a system, or a replacement part.

To purchase, please email

iPAQ settings:

1. Tap Start > Settings > System Tab > iPAQ Audio > Microphone AGC Tab.
2. Disable Automatic Gain Control.
3. Set Microphone Gain to 27.
4. Tap OK.
5. Tap Start > Settings > System Tab > Backlight > Battery Power Tab
6. Adjust 'Turn of backlight if device is not used for' to 3 min.

Connecting STG Stethoscope to iPAQ:

1. Start recording with the STG software
2. Gently tap the diaphragm. If you don't see sharp spikes occupying all vertical space of the screen, disconnect and reconnect iPAQ cable from the iPAQ until you see spikes. The spikes will appear when iPAQ switches to record from external microphone.
3. Firmly position stethoscope and start recording.

Acoustic Characteristics
Sound quality The sound that you hear with the STG Stethoscope is the sound that you hear with any acoustic stethoscope.
Comparability The STG Stethoscope acoustic quality is comparable to Littmann Master Classic II.
Bell and Diaphragm Modes The chest piece lets you monitor low and high-frequency sounds by alternating pressure on the chest piece. Reduce pressure for the bell mode, increase pressure for the diaphragm mode.
Length 69cm (27in)
Chest piece rim Nonchill plastic rim
Ear tips Soft sealing ear tips
Sound Recording and Visualization
System Frequency Response 50Hz to 2000Hz
Sensitivity -44±4dB
Supply Voltage 1.2V Min, 20V Max
Rated Current Drain 130 µA Max @ Ta –25°C
Temperature -40°C to +70°C
Recording mechanism Electret microphone is positioned in the space continuous with the tubing chamber.
Output jack 3.5mm stereo audio jack. signal is on ring and tip that are tied together.
Safety and EMI tests Has passed Safety and EMI tests.

Recording techniques:
Holding a chest piece by hand often generate artifacts that make visual display unreadable. If you have this problem (and most people do), we suggest that you attach the chest piece to skin so that you do not need to hold it. There are several attachment methods you can use:
1. Just place the chest piece on bare skin. If the chest piece is heavy enough it will stay in place.
2. Attach the chest piece with 3M Double Stick Discs (SKU B11687). You can order it here: 3M Double-Stick Discs pack of 102 Size 1 1/4" 3M SAS2349 (HC) 3M 2181 (Pack).
3. Use a rubber belt to hold chest piece in place. We prefer maternity belt used to hold a doppler monitor in place when the hospitals want to hear the fetal heartbeat for an extended time. It's made of very soft, pliable and stretchy material. You can order it here:, Toco Abdominal Belts, Model ABC-4425