SD32+
System
Introduction
Figure 5. headbox electrode sockets
Monopolar Input Sockets –
These input sockets, labeled with numbers ranging from “1” to “32”,
accept monopolar signals from the patient. The amplified signal is the difference in potential
between a monopolar input socket and its reference electrode socket. Channels collected using
these input sockets may be referenced to the Neutral (NE) input sockets.
Bipolar Input Sockets –
These input sockets, labeled with letters ranging from “A” to “H”,
accept inputs from bipolar monitoring devices such as a respiratory belt, snore microphone,
thermocouple, or any device with a bipolar output. The amplified signal is the difference of
potential between the “+” and “–” connection.
Neutral (NE) Sockets –
These sockets accept monopolar analog signals and may be used as an
input reference for sites plugged into the sockets labeled “1” to “32” (i.e. they may be used to
accept a general reference input such as CZ for numbered AC channel inputs). There are three
parallel neutral input sockets on the Headbox labeled “NE”. This is also used as the reference
when impedance testing is done.
Isolated Ground (ISO GND) Sockets –
These sockets, labeled “ISO GND”, accept and isolate the
patient ground to prevent leakage current from making a direct path to the patient. The 13
Isolated Ground input sockets connect the patient to ground.
Warning: The output from any DC device plugged directly into the Headbox must provide
an electrically isolated signal. Do not plug a non-isolated DC signal into the
Headbox as this compromises patient safety.
Temperature Sockets –
These two sockets, labeled “T°”, accept input from an external
temperature probe. These input sockets are disabled if you have connected the Headbox to the
amplifier with the Headbox to Amplifier Cable.
Calibration Sockets –
When these two sockets, labeled “C”, are enabled, they output the
amplifier’s calibration signal. You can connect the signal to any input (including the lead used for
the connection) for testing. These sockets are disabled if the Headbox is connected to the
amplifier with the Headbox to Amplifier Cable.
13
