118 Chadwick-Helmuth Company, Inc.
Chapter 6 - Maintenance
6.2 Theory of Operation
The Vibrex 2000 and Vibrex 2000 Plus acquire, display, process, and
analyze vibration data for fault analysis and balance correction. The
following basic subsystems make up the Vibrex unit, as explained in this
section:
•Digital
•Display
•Analog
•Power
6.2.1 Digital Subsystem
The digital subsystem resides on the main printed circuit board (PCB).
This subsystem contains the following elements: [for the 13590-3 amd the
Plus, 14490]:
• Microprocessor, Motorola 68332, running at 16.78 MHz [25 MHz]
• Static random-access memory (SRAM), 256 KB [1MB]
• Erasable, programmable read-only memory (EPROM), 256 KB
[1MB]
• Serial communication interface (RS-232)
• Timing pulse output circuitry for the Model 135M-12 Strobex
Tracker
The microprocessor chip executes the operating code that resides in the
EPROM. This chip coordinates sampling with the analog-to-digital
converter (ADC) and also receives, processes, and stores digitized signals
from the ADC.
Additionally, the microprocessor chip scans the keyboard, interpreting
user inputs, programming the vibration and tachometer input channels,
and displaying results and information on the liquid-crystal display
(LCD) screen. Also, the microprocessor transmits data to the outside, that
is, to a printer or PC, via an RS-232 serial interface and a nine-pin
connector.
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