2- to 8-Channel Anti-Alias Low-Pass Filter and Instrumentation Amplifier Card for Signal Conditioning in Data Acquisition Systems
With Band-Pass Filter Options!
The AAF-3 is a 2- to 8-channel anti-alias low-pass filter and instrumentation amplifier ISA bus plug-in board for front-end signal conditioning in PC-based data acquisition systems. It provides a choice of 8-pole Butterworth, Bessel, Elliptic(Cauer) and linear phase linear phase characteristics to meet specific application requirements.
Each channel on the AAF-3 can have its own instrumentation amplifier with differential inputs. Each channel can be independently programmed for a gain of 0.5, 1, 2, 5, 10, 20, 50, 100, 200, 500 or 1000 giving the AAF-3 an input range capability of 5mV to 20V.
The corner frequency of each 2-channel filter module can be set with an external clock or programmed with one of the two internal clock sources for a range of frequencies from below 1 Hz to 200 kHz. Each 2-channel pair can operate with a different corner frequency, allowing for up to 4 different corner frequencies on each AAF-3.
The input can be wired single-ended or differential. If differential input is required, the AAF-3G must be used as a front end to the AAF-3F filter module or the AAF-2Fe may be used with or without the AAF-3G.
Band-Pass Filter Options
The AAF-3 can be configured as a band-pass filter by using an AAF-HP high pass filter in series with an AAF-2Fe or AAF-3F low pass filter module. This configuration can be made with the AAF-3M-001 factory installed option or the channel series configuration can be made in the external cabling. The filter sections offer a maximum pass band bandwidth of 200:1. For example, a filter with a high pass or lower corner frequency of 1Hz can have a maximum low pass corner frequency of 200Hz.
Alligator Technologies has developed both DOS and Windows based menu-driven and an application program interface (API) DLL library for controlling the functions on the AAF-3. We support both of the Windows 95 and Windows NT device driver configurations making the AAF-3 software compatible to any version of 32-bit Windows and any other operating system supporting the Windows constructs. The operating system is sensed automatically and the proper device driver will operate without user intervention.
Function Libraries- Many applications require direct control over multiple devices in the system. We make the application program interface (API) to the DLL available for applications requiring control written in any high level language so that control of the AAF-3 can be tightly integrated with other device controls.
Example application programs are provided for popular compilers, including Visual C++, Visual Basic, Borland C++, and Borland Pascal.
LabVIEW Driver - AAF3.LLB VI can be graphically assembled with other VIs in a LabVIEW block diagram to create a complete instrumentation system.
HP VEE User-Object - Both 16- and 32-bit user-objects for HP VEE.
Connection to Your Data Acquisition System
All I/O connections from the AAF-3 are made via two 26-pin female high-density D-sub connectors that extend out of the rear of the computer.
Screw Terminal Card - The STA-AAF-3 screw termination board provides labeled one-to-one I/O connections for the AAF-3. The STA-AAF-3 uses Wago connection points, a spring clamping system that reduces wiring time substantially compared to screw-type methods. The clamping force adjusts automatically to wire size, so it provides a reliable contact virtually independent of operator skill. The end-result is secure, vibration-proof, maintenance-free clamping every time.
Cable Accessories - A variety of custom cable accessories are available for connecting the AAF-3 to any A/D board and to any system. These accessories include BNC connector boxes for input and twisted-pair ribbon cables for output.
How to Order
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