SD32+
System Introduction
Figure 11. power transfer cable
3.7.2. amplifier power modes
The Sandman Elite software can control the SD32+ amplifier power modes. When power is
applied to the DC In socket of the amplifier, it automatically enters “stand-by” mode. In this
mode, all internal circuitry is switched off except for a simple circuit that monitors the state of the
Optical Link Port.
When the computer is started, it automatically sends a light signal through the fiber optic
connection. This signal causes the amplifier to enter its “active” or “on” mode, immediately
perform an auto test, and display the test results on the LCD screen. To completely turn off the
amplifier you can either remove the Power Transfer Cable from the DC In socket or unplug the
AC/DC Adapter from the wall outlet (this will power down the elink causing it to stop providing
power to the SD32+ amplifier).
There is an easy check to test the amplifier without involving the computer. Press and hold one of
the five Menu Control Keys until the amplifier enters “active” mode and performs the auto test.
See section 3.4. LCD display on page 17 for more information on these buttons.
3.7.3. surge protection
The AC/DC Adapter used with the SD32+ system contains an electronic fuse that may
automatically turn off the amplifier if a power surge occurs. If the Sandman elink Adapter does
not power up when connected to the AC/DC Adapter, a surge may have triggered this fuse and
it will need to be reset.
To reset the fuse:
1. Unplug the AC/DC Adapter from the wall socket.
2. Wait approximately one minute.
3. Plug the adapter back into the wall socket.
After you reset the fuse the Sandman elink Adapter should power up normally, if it does not, reset
the fuse again. If after repeated resets the Sandman elink still does not power up you should
contact Embla Technical Support for assistance.
3.8. DC expansion box
The DC expansion box provides supplemental DC input sockets in addition to the DC-capable
input sockets labeled “25” to “32” on the SD32+ amplifier headbox. To ensure the patient’s
electrical isolation, the DC expansion box does not connect to the SD32+ amplifier. Instead, it is
located in the control room and sends collected signals directly to the computer. See Figure 12. dc
expansion box input sockets, for an illustration of the sockets available.
Though the amplifier and the DC expansion box are not directly connected, the Sandman Elite
software can collect signals from both units at the same time in a single montage and store them
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