If sounds from the Chest Piece are heard at the headset, then the AMD-3700 units are
working properly and if problems arise in connecting the unit to the Data Channel, it is
appropriate to the concentrate on getting the signal through the Data Communications
Channel.
C. Mode
Selection
If there is no Chest Piece Assembly plugged into the Chest Piece jack of the unit, then
the unit will be in Receive Mode and the RX Mode light will be illuminated. The TX
Mode light will be OFF.
If a Chest Piece Assembly is plugged into the Chest Piece jack of the unit, then the unit
will be in Transmit Mode and the TX Mode light will be illuminated. The RX Mode light
will be OFF.
III. Operation
For a normal remote auscultation exam, the AMD-3700 unit located with the patient is in
Transmit Mode and the AMD-3700 unit with the clinician is in the Receive Mode.
A. TX
Mode
To operate as an auscultation transmitting unit the AMD-3700 must have a Chest Piece
Assembly plugged into the Chest Piece jack. That will put the unit into Transmit Mode
and illuminate the TX Mode light located just over the Chest Piece jack. Sounds from
the Chest Piece will be converted to digital signals and sent out over the RS232 data
interface.
In addition to transmitting the digital signals, the auscultation sounds from the Chest
Piece are looped back and presented at the local Headset jack. Thus, with an optional
Headset, the local user can listen to the same auscultation sounds that the listener at
the remote AMD-3700 (in Receive Mode) would hear.
Volume to the Headset can be increased by turning the Volume control clockwise.
Increasing the volume too high can cause distortion in the Headset and will also
increase the background noise. Start with the lowest volume necessary to hear the
sounds, then turn up the volume as needed to focus in on specific sounds.
The B/D Switch can be used in an auscultation exam similarly to a traditional
stethoscope. The Bell (B) position cuts off the high end at 250 Hz and boosts the low
frequencies below 100 Hz for enhanced heart auscultation. The Diaphragm (D) position
slightly reduces the very low frequency sounds and extends the high frequencies to
1,400 Hz.
Adjusting the Volume or changing the B/D Switch only affects what the local listener
hears and does not affect what the remote AMD-3700 listener would hear. The remote
AMD-3700 listener has independent Volume and B/D Switch controls.
AMD Global Telemedicine, Inc.
73 Princeton Street North Chelmsford, MA 01863
978-937-9021 (phone) 978-937-5249 (fax)
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