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RUSKA 7750i
Users Manual
Power Supply
The ADTS's universal power supply accepts AC voltages from 100 – 120 VAC and
220 – 240 VAC at 50 / 60Hz. This quad-output supply produces +5 VDC, +/-12 VDC,
and 24 VDC, which are distributed to the Control and Backplane Boards.
Electronics Module
Back-Plane Board
The Back-plane Board is used to interconnect all of the plug-in electronic boards and
distribute power. The Microprocessor Board, the Digital Control Board, and the
IEEE-488 Interface all plug into the Back-plane Board. The Front Panel communicates
with the Microprocessor Board via cables. The Sensor Board communicates with the
Microprocessor board through an internal RS-485 serial communication bus.
Microprocessor Board
All of the ADTS's software resides in nonvolatile, programmable, read-only memory
(Flash EPROM) on the Microprocessor Board, which plugs directly into the Back-plane
Board. This software contains all of the instructions that operate the ADTS, as well as the
conversion factors that the ADTS uses to translate the internal pressure unit-of-measure
of kPa into the units selected by the user. These factors are given in Table 2-1.
Data that is subject to change after the ADTS leaves the factory is held in electrically
erasable, programmable, read-only memory (EEPROM). This includes the current units
of measure, the coefficients from the zeroing process, the current pressure medium,
calibration coefficients, and the conversion factors for the four user-defined units of
measure.
When the ADTS powers up, its software is loaded into random access memory (RAM),
also on the Microprocessor Board. At the same time, the values stored in EEPROM
Board are restored to memory.
Another important component on the Microprocessor Board is the lithium battery. The
battery continuously updates the ADTS's date and time, even when the unit is powered
down. This battery has a varying life. If the instrument is left on 24 hours a day, it will
last 5 to 10 years. If the instrument is stored, it may only last one year.
The Microprocessor Board also supports the RS-232 serial interface that allows the user's
computer to communicate with the ADTS.
Unless specified otherwise, conversion factors are based on ANSI 268-1982.
2-2
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