Arena Service Manual
5.4.7 Slot # 8: Memory Board
The Memory Board contains the 64 KB non-volatile SRAM (Static
Random Access Memory) accessible by software to store the
information about calibrations and Instrument parameters. This
SRAM has a self-contained battery to keep the data.
This memory contains various parameters for configuration, such
as calibration constants and variable data, as well as storage of
treatment profiles and patient information. The memory locations
are divided into various sections, such that variables can be added
without affecting other locations.
Information about various features and implementations of the
dialysis machine is also stored in this SRAM.
Calibration Constants
Space is allocated for up to 250 calibration constants accessible
from the calibration screen via Constant Entry selection. In order
to change these constants a password is required.
For compatibility, default values for the calibration constants are
contained in the software, and overwrite the SRAM contents if
needed.
There are three types of calibration constants:
• Constants that determine the configuration of the machine
and are not intended to be changed, such as Display Type,
Hydraulics Type, etc.
• Constants that are adjustable during calibration at the time
of manufacturing of the Instrument, such as Temperature
Probe Gain, BP Motor EMF, etc.
• Constants that allow the Instrument to be customized, such
as the Date Format, Bleach Name, etc.
WARNING
Calibration constants must only be changed by
authorized Baxter personnel or by specific instructions
provided by Baxter.
5-26 157-1278-912 Rev A
November 2003
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