Product Detail
PGA-16__________
16 Channel
Instrumentation Amplifier Card
16-Channel Instrumentation Amplifier Card With Programmable Gain and AC/DC Coupling
Now available with DASYLab drivers!
Features
- Instrumentation amplifier on each of 16 channels
- Differential input
- Software-selectable gains of 0.5, 1, 2, 5, 10, 20, 50, 100, 200, 500, 1000 per channel
- Programmable AC or DC coupling
- Comes with programs and libraries for DOS, Windows 3.1/95/NT, LabVIEW, HPVEE and DASYLab
- New HP VEE user-object available on request
- Menu-driven software with easy-to-use graphical interface
- Use several boards together in AT-SYS-1000 with RS-232 programmability
Overview
The PGA-16 is a 16-channel instrumentation amplifier with differential input, single-ended output, programmable AC or DC input coupling and pre-filter gain. The PGA-16 may be used as an input conditioner for any A/D converter or for our AAF-16 anti-alias filter card.
Each channel of the PGA-16 has its own instrumentation amplifier with differential inputs. Using the included software, you can configure each channel independently for a gain of 0.5, 1, 2, 5, 10, 20, 50, 100, 200, 500, or 1000.
Performance on the PGA-16 is outstanding from DC to 200kHz, and a slew rate of 9V/microsec allows the card to handle large, fast signals.
Advantages of Pre-Filter Gain
Many data acquisition boards provide multiple input ranges by using software-programmable gain amplifiers. While this kind of gain lets you change the input range, it also can present a new problem: amplification of electrical noise added by the measurement system to the signal.
If the gain is on the A/D board (post-filter gain), it amplifies not only the signal, but also any noise added by common measurement-system sources, such as the signal conditioner, the computer interconnections, or the A/D input circuit. On the other hand, if the gain is directly on the signal (pre-filter gain), only the signal is amplified. Pre-filter gain, which the PGA-16 provides, can make the low-level signal override the measurement-system noise, providing a dramatic improvement in signal-to-noise ratio. Post-filter gain cannot, since it amplifies the measurement-system noise along with the signal.
In addition, the A/D board post-filter gain usually multiplexes multiple channels into a single amplifier. The settling time of the amplifier can cause artificial signal errors unless delays are built into the sampling control. With the PGA-16, each channel has its own full-time amplifier, eliminating this restriction.
Support Software
Alligator Technologies has developed both menu-driven and driver-level software for controlling key functions on the PGA-16.
Menu-Driven Software - The menu-driven program uses a single setup screen with pop-up menus for selecting such key parameters as gain setting, AC or DC coupling and board address. Once selected, a combination of settings can be saved as a PGA-16 description file. Once saved, the settings stored in this file can be easily applied to other boards by selecting the file.
DOS and Windows Drivers - If you prefer to develop your own programs, the PGA-16 comes with DOS and Windows linkable libraries that provide high-level functions for configuring and controlling the PGA-16. Example application programs are provided for popular compilers, including Visual C++, Visual Basic, and Pascal.
LabVIEW Driver - PGA16.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.
DASYLab Driver - Provides radio buttons for selecting the filter type, clock source and gain setting.
Connection to Your Data Acquisition System
Inputs from the signal sources connect to the PGA-16 via a 44-pin high-density D-sub connector, which extends out of the rear of the computer. If you are using an AAF-16 filter, you can connect PGA-16 outputs to AAF-16 inputs either externally via a 26-pin connector or internally via a 34-pin dual-row ribbon-cable connector.
Filter Systems - The PGA-16 plugs into the PC and is programmable through the ISA bus.
|
|
||
| LAPLACE INSTRUMENTS
LTD 3B, Middlebrook Way, Holt Road, Cromer, Norfolk, NR27 9JR, UK |
Tel: + 44 (0)1263 515160 Fax: + 44 (0)1263 512532 E-mail:tech@laplace.co.uk |
|
|
|
||
