Aspect BIS VISTA - Diagnostic Codes; Monitor Data Memory; System Check

SECTION 3 PRINCIPLES OF OPERATION
_______________________________
_
_______________________________________
3-7
3.3.1.1 System Check
Software image checksums and trend data memory are tested and repaired if necessary
when the system is powered up for the first time, after a new battery or power supply are
installed, or after the system has been reset.
3.3.1.2 Equipment and Connection Checks
The system checks continuously to be sure that the BISx, the PIC, and patient sensors are
operating properly and have not become disconnected.
3.3.1.3 DSC Self Test
The DSC Self Test tests the digital signal acquisition and conversion functions of the BISx.
It is a thorough test of the entire signal processing chain. The DSC Self Test may be initiated
from the Diagnostics Menu (See Section 6.2.2., “The BISx Checkout Procedure”)
3.3.1.4 Sensor Integrity Check
This test begins each time that a sensor is connected to the PIC. It checks to make certain
that a valid, unexpired sensor is in use.
3.3.1.5 Impedance Check (Sensor Check)
Electrode impedance is tested when the BISx and PIC are connected and is monitored
continuously unless the user has turned impedance checking off in the menu system.
Caution:
Continuous impedance checking may need to be disabled if the 1
nanoampere 128 Hz impedance check signal interferes with other
equipment, e.g., evoked potential monitors.
3.3.2 Diagnostic Codes
The BIS VISTA monitor provides diagnostic codes to assist the user in tracing the source of
any problems that may occur. Codes are displayed in the Message Region only if the user has
requested them in the Diagnostics Menu.
3.3.3 Monitor Data Memory
The monitor stores recorded trend data with time and date of acquisition. The duration of
trend data stored is approximately 72 hours. Trend memory can be viewed on the screen by
pressing the [Trend Review] key or, while a case is in progress, by using the Review arrow
key [◄] .
Information on the current sensor can be viewed in the “Configuration Information”
Screen.
When the memory is full, the oldest data are automatically erased as new data are stored.
Memory will be retained even if the battery has been discharged and remains when the
monitor is in the power off condition.