Datasheet

Signal Conditioning Amplifier System
A2
Vishay Micro-Measurements
www.vishaymg.com [e-mail] Document Number: 11005
12 Revision: 24-Aug-06
FEATURES
• Strain gage, transducer, and thermocouple inputs
• Frequency response to 110kHz
• Analog output of ±10VDC
• Operation with 12 to 15VDC and 120/240Vac power
• Scalable from 8 to 128 channels in high-density enclosures
• Digital control from both front panel and PC over Ethernet
• Remote channel-by-channel monitoring of signals by
Ethernet
DESCRIPTION
The A2 is an analog signal conditioner and amplifier system
for strain gages, strain-gage-based transducers,
thermocouples and various other sensors with high-level
signals. Scalable in multiples of eight channels to a
maximum of 128 for each system, the A2 features digital
control of the system instrumentation and monitoring of the
analog outputs, both locally on the control panel and
remotely by Ethernet from a PC. The Model A2 is an
embedded web server. All system, card, and channel
settings are accessible using simple HTTP (hypertext
transfer protocol) commands or by using the graphical user
interface provided by the system. Ordinary web browsers,
such as Internet Explorer, can be used to control the system.
The A2 is specially designed to function as the front-end for
DAQ’s and recorders accepting high-level analog signals.
Instrumentation hardware, available as individual eight-
channel cards for strain gage, thermocouples, and high-level
signals, features high stability with temperature and time.
Strain-gage instrumentation accepts full-, half-, and
quarter-bridge circuits and has built-in bridge completion
resistors for 120-, 350- and 1000-ohm quarter bridges.
Amplifiers gain; bridge excitation and balance; shunt
calibration; and signal filtering are digitally controlled.
Instrument design enables sensors to remain connected
when cards are removed from the system for bridge
configuration.
SPECIFICATIONS
General
All specifications are nominal or typical at +23°C unless
noted. Performance may be degraded in the presence of
high-level electromagnetic fields.
System Configuration
Each system consists of a Model A2-MC-8 Controller and at
least one 8-channel instrumentation card. Stackable expan-
sion cabinets are added when two or more instrumentation
cards are used.
Physical Dimensions:
Eight Channel Enclosure with Controller:
17” W x 12” D x 8.5” H [43.2cm W x 30.5cm D x 21.6cm H]
40 Channel Enclosure with Controller:
17” W x 12” D x 17.5” H [43.2cm W x 30.5cm D x 44.6cm H]
72 Channel Enclosure with Controller:
17” W x 12” D x 26.5” H [43.2cm W x 30.5cm D x 67.3cm H]
104 Channel Enclosure with Controller:
17” W x 12” D x 35.5” H [43.2cm W x 30.5cm D x 90.2cm H]
128 Channel Enclosure with Controller:
17” W x 12” D x 44.5” H [43.2cm W x 30.5cm D x 113.0cm H].
Input Power:
115 or 230VAC with optional external “line lump” power
supply (15VDC output). Will also work from a 12V battery
with reduced specifications.
Controller with Model A2-EC Expansion Cabinets