Fluke Calibration RUSKA 7615, Руководство пользователя

Страница: 17 / 64

2-1
Chapter 2
Theory of Operation
Introduction
The Calibrator’s power supply, electronics, pneumatics, hydraulics, and sensor combine
to form a complete, stand-alone, measure and control instrument. This portion of the
manual breaks the Calibrator down into its component modules (See Figure 2-1) and
provides a general discussion of each.
The Power Supply
The Calibrator’s universal power supply accepts AC voltages from 115/230 VAC volts.
This outputs supply voltages of +5 VDC, +12 VDC, -12 VDC, and 24 VDC which are
distributed to the Back Plane Board and Control Board.
The Electronics Module
The Calibrator’s electronics module consists of an electronic back plane the
Microprocessor Board, Analog/Digital I/O Board, Pressure Control Board, IEEE
interface, and the Front Panel.
The Back Plane
The Microprocessor Board, Analog/Digital I/O Board, Control Board and the IEEE
Interface all plug into the Back Plane Board. The +5 VDC, + 12 VDC, and – 12 VDC
voltages supplied by the Power Supply is distributed from the Back Plane Board to the
four plug in boards and to the front display.
The Microprocessor Board
All of the systems software resides in non-volatile, programmable, read-only memory
(Flash EPROM) on the Microprocessor Board. This software contains all of the
instructions that operate the instrument, as well as the conversion factors that the
instrument uses to translate the detected pressure into the units selected by the user.
These factors are given in Table 2-1.
When the Calibrator powers up, its software is loaded into random access memory
(RAM), which is also on the Microprocessor Board. At the same time, the values stored
in EEPROM are restored to memory.
Another important component on the Microprocessor Board is the lithium battery, which
continuously updates the Calibrator’s date and time, even when the unit is powered down.
The Microprocessor Board also supports the RS-232 serial interfaces, which allow the
user’s computer to communicate with the Calibrator.