Introduction
SD32+
System
3. Introduction
3.1.
Sandman
®
Digital 32+
™ amplifier (
SD32+
)
The SD32+ amplifier is a self contained, fully programmable, digital amplifier that is designed
specifically for use with the Sandman Elite
®
software (version 7.2 or greater) and the Sandman
Spyder™ software. It collects physiological signals from patients through electrodes/sensors;
amplifies and converts them to digital data; converts the data to an optical signal; then sends the
data to the Sandman elink™ Adapter via a fiber optic link (the Sandman elink then passes the data
to the computer running the Sandman Elite software).
The SD32+ amplifier has the following features; provides electrical references for individual
input channels, generates calibration pulses, allows for impedance testing, provides a dynamic
range (gain), provides a choice of sampling rate, and is equipped with anti-alias signal filtering.
The SD32+ system consists of seven key components: the Headbox, Amplifier, Headbox to
Amplifier Cable, Sandman elink Adapter, pulse oximetry sensor, External Medical Grade AC/DC
Adapter, and the DC expansion box. These components can be seen in Figure 1. the SD32+ system.
The Headbox provides an electrical connection between the patient and the SD32+ amplifier
using electrodes.
The Headbox to Amplifier Cable allows the Headbox to function without being physically
mounted to the SD32+ amplifier allowing for greater flexibility in lab setups.
The Sandman elink Adapter receives optical digital data from the SD32+ amplifier and converts it
for transmission over an Ethernet network to relay it to the computer running the Sandman Elite
software. The SD32+ amplifier communicates with the Sandman elink Adapter via fiber optic
cable.
The External Medical Grade AC/DC Adapter (“AC/DC Adapter”) provides an isolated +15V
direct current (DC) voltage to the SD32+ amplifier through the Sandman elink. The +15V DC
output is electrically isolated from the AC supply mains using methods compliant with the
International Electrotechnical Commission’s (IEC) safety standard IEC 601-1 for Class I, type B
equipment. The AC/DC Adapter is plugged into an Uninterruptible Power Supply (UPS); which,
in turn, is plugged into an electrical outlet. The UPS is used to prevent undesirable effects of the
electrical system such as electrical noise; power outages, sags, or surges; etc. from adversely
affecting the performance of the SD32+ system.
The SD32+ amplifier’s internal Pulse Oximeter receives data from a finger probe attached to the
patient. This data is then sent to the Sandman elink Adapter; which passes it on to the computer
running the Sandman Elite software.
The DC expansion box accepts analog input signals from a variety of DC devices (e.g. CPAP or
pressure) and sends their signals directly to the computer running the Sandman Elite software.
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