Aspect BIS VIEW, Service Information Manual

Page: 31 / 100

SECTION 3 PRINCIPLES OF OPERATION
_______________________________________________________________________
3-7
Caution:
Exposed metal parts are double insulated from live parts of the
monitor and are not wired for safety current. A ground continuity test
is not recommended.
3.2.2.1 The BISx Interface
The BISx interface is composed of two RS-232 serial lines, one going to the BISx and
another bringing data from the BISx, plus a 5 volt line for powering the BISx.
The 5 volt power to the interface is under software control.
3.2.2.2 The Interconnect Board
The Interconnect board provides the physical mounting and electrical connections for the
serial and USB ports. Its mechanical construction includes ESD protection.
3.2.2.3
The Power Supply
The BIS VIEW utilizes a commercial Class I medical-grade power supply which operates on
AC power from 100-240 VAC, 50-60 Hz, with output of 12 VDC, 24 watt maximum. It
charges the battery; 7.2 V (nominal), 2150 mA hr. The power supply contains internal fuses
that are not user accessible.
Signals from the motherboard are provided to the processor to indicate A.C. or battery
powered, and low battery.
Caution:
To turn off all A/C power, disconnect power cord from A/C outlet.
Battery can be removed to shut down unit completely.
3.2.2.4 The Battery
The battery is for backup use only. The battery includes temperature and current control
elements, and has a nominal output of 7.2 volts DC. The battery charges whenever the BIS
VIEW monitor is plugged into A/C power. It is capable of supporting monitor operation
for approximately 45 minutes.
Note:
The BIS VIEW monitor may not power up entirely if battery power is
low. If that should occur, connect unit to wall power and press the
Reset button. (Refer to Section 8.9 “Using the Reset Button.”)
3.3 System Features
3.3.1 System Self Checks
The BIS VIEW monitor has several self-checking features to ensure that the system is
operating properly. These include: