Honeywell VXP, System Maintenance Manual, Page: 19 / 105

Introduction
VXP System Maintenance Manual 1-9
1.2.1 Acquisition Unit
The Acquisition Unit (AU) is a microprocessor controlled signal analyzer which also has a
dedicated DSP processor. It has its own operating system, and runs application specific software
which performs specialized aircraft measurements and analysis. It contains four independent,
high-speed data acquisition paths, and can simultaneously collect and process four channels of
vibration data plus an azimuth signal and a tracker signal. The AU has a total of 48 special
vibration sensor interfaces, as well as built-in charge converters and photocell processors. It
operates from +28 Vdc aircraft power, and has an accessory power supply that can provide DC
power to the printer and Display Unit. It is housed in a rugged aluminum chassis, and is
environmentally sealed. The front panel has discrete connectors for accelerometer and/or
velocimeter inputs, azimuth inputs, power, FasTrak, Strobex, and communications interfaces, and
an expansion connector for additional vibration inputs and specialized interfaces. The Acquisition
Unit is shown in Figure 1-1.
Table 1-3. Acquisition Unit Leading Particulars
Parameter Characteristic
Dimensions 7.1 W x 4.6 H x 10.2 D (inches)
180 W x 117 H x 259 D (mm)
Weight 6.5 lbs. (2.95 kg)
Input Power 18-32 Vdc (28 Vdc nominal), 65 watts
maximum
Power Source 28 Vdc aircraft power or external power
supply
Operating Temperature Range -30°C to +60°C
Storage Temperature Range -55°C to +85°C
Processing 32-bit microprocessor
Digital Signal Processor (DSP)
RISC based Time Processor Unit (TPU)
Memory 6 MB DRAM
2 MB FLASH
2 MB SRAM