Acquisition Daq
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In short data acquisition systems are also referred to as DAS or DAQ which generally includes acquisition of signals and waveforms and then interpretation of signals to obtain desired information. These different properties which are analyzed through data acquisition are facts such as temperature, pressure, density, viscosity etc.
Data acquisition systems have a huge use in scientific and medical research purposes such as magnetic resonance imaging, microelectrode recording, and Eco cardiology, remote monitoring, laser Doppler flow etc.
They serve as an important part of gathering any vital information using data analysis software and equipments.
Some of the common forms of data acquisition at larger scale are seismic data acquisition, wireless data acquisition, pc data acquisition and SCADA (supervisory Control and Data Acquisition) which is the most widely used system referring to a computer system monitoring industrial, infrastructure or facility based processes like manufacturing, production, power generation, water treatment distribution and energy consumption.
Let’s get familiar with some more technical terms in data acquisition:
• Analog-to-digital converter (ADC) An electronic device that converts analog signals to an equivalent digital form. The analog-to-digital converter is the heart of most data acquisition systems.
• Digital-to-Analog Converter (D/A) An electronic component found in many data acquisition devices that produce an analog output signal.
• Digital Input/Output (DIO) Refers to a type of data acquisition signal. Digital I/O is discrete signals which are either one of two states. These states may be on/off, high/low, 1/0, etc. Digital I/O is also referred to as binary I/O.
• Differential Input Refers to the way a signal is wired to a data acquisition device. Differential inputs have a unique high and unique low connection for each channel. Data acquisition devices have either single-ended or differential inputs, many devices support both configurations.
• General Purpose Interface Bus (GPIB) Synonymous with HPIB (for Hewlett-Packard), the standard bus used for controlling electronic instruments with a computer. Also called IEEE 488 in reference to defining ANSI/IEEE standards.
• Resolution The smallest signal increment that can be detected by a data acquisition system. Resolution can be expressed in bits, in proportions, or in percent of full scale. For example, a system has 12-bit resolution, one part in 4,096 resolutions, and 0.0244 percent of full scale.
• RS232 It’s a standard for serial communications found in many data acquisition systems. RS232 is the most common serial communication, however, it is somewhat limited in that it only supports communication to one device connected to the bus at a time and it only supports transmission distances up to 50 feet.
• RS485 It’s a standard for serial communications found in many data acquisition systems. RS485 is not as popular as RS232, however, it is more flexible in that it supports communication to more than one device on the bus at a time and supports transmission distances of approximately 5,000 feet.
• Sample Rate The speed at which a data acquisition system collects data. The speed is normally expressed in samples per second. For multi-channel data acquisition devices the sample rate is typically given as the speed of the analog-to-digital converter (A/D). To obtain individual channel sample rate, you need to divide the speed of the A/D by the number of channels being sampled.
• Single-ended Input (SE): Refers to the way a signal is wired to a data acquisition device. In single-ended wiring, each analog input has a unique high connection but all channels share a common ground connection. Data acquisition devices have either single-ended or differential inputs. Many support both configurations.
With the progress in technology data acquisition has become more advanced and reliable have come all the way from using simple devices to highly sophisticated computer systems and has proved to be the greatest engineering marvel in achieving data precision.
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To learn more about data acquisition systems and the process of data logging, visit the official website of Biopac.
Article Source: ArticlesBase.com - Engineering marvel of Data Acquisition Systems
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USB Temperature Logger $59.00 For industrial or home use: Perishable food, manufacturing, warehouses, museums, HVAC, refrigeration trucking, mold control, vacation homes, greenhouses, wine cellars, humidors, nurseries, attics, crawl spaces, workshops, barns, vehicle cargo spaces, documentation storage. The USB-501 logs up to 16,382 temperature measurements in the -31 to +176 ºF (-35 to +80 ºC) range. Simply plug the USB-501 ... |
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USB Data Acquisition Module $129.00 The USB-1208LS from Measurement Computing adds a low cost analog and digital I/O interface to any USB port. Providing 8 single-ended or 4 differential analog inputs with 12-bit resolution, the USB-1208LS offers sample rates up to 1.2 kilosamples/sec (8 kS/s for up to 4000 samples). The USB-1208LS also offers 8 software selectable input ranges, making it ideally suited for a wide assortment of meas... |
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USB Temperature & Humidity Logger $82.00 For industrial or home use: Perishable food, manufacturing, warehouses, museums, HVAC, refrigeration trucking, mold control, vacation homes, greenhouses, wine cellars, humidors, nurseries, attics, crawl spaces, workshops, barns, vehicle cargo spaces, documentation storage. The USB-502 logs up to 16,382 temperature and 16,382 relative humidity measurements concurrently. Simply plug the USB-502 logg... |
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USB Analog Input Module $189.00 The USB-1208FS is a USB-based device that sets a new standard for low-cost, PC-based analog and digital I/O. Providing 8 single-ended inputs with 11-bit resolution or 4 differential inputs with 12-bit resolution, the unit offers sample rates up to 50 kilosamples/sec with 8 software selectable input ranges. The unit also provides 2 channels of 12-bit analog output, one 32-bit counter and 16 bits of... |
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U3-LV $111.50 USB DAQ device with up to 16 12-bit analog inputs, up to 20 digital I/O, 2 10-bit analog outputs, up to 2 counters, and up to 2 timers. All LabJack products are shipped via UPS Ground (1-5 days shipping) within the continental USA. Amazon, however, bases shipping rates on USPS only, so a $3.50 fee has been included in the price shown to cover the difference. Unlike USPS, UPS Ground provides insur... |
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U3-HV $117.50 USB DAQ device with 4 12-bit high-voltage analog inputs, up to 12 low-voltage analog inputs, up to 20 digital I/O, 2 10-bit analog outputs, up to 2 counters, and up to 2 timers. All LabJack products are shipped via UPS Ground (1-5 days shipping) within the continental USA. Amazon, however, bases shipping rates on USPS only, so a $3.50 fee has been included in the price shown to cover the differen... |
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LJTick-CurrentShunt $42.50 The LJTick-CurrentShunt (LJTCS) is a signal-conditioning module designed to convert a 4-20 mA current loop input signal into a 0.47-2.36 volt signal compatible with the LabJack U3 or UE9. The 4-pin design plugs into the standard AIN/AIN/GND/VS screw terminal block found on newer LabJacks such as the U3 and UE9. All LabJack products are shipped via UPS Ground (1-5 days shipping) within the continen... |
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USB Temperature Measurement Module $359.00 The USB-TC is a USB-based temperature measurement device that provides 8 thermocouple temperature inputs. The USB-TC offers the most accurate temperature measurement possible, since the internal measurement electronics accuracy exceeds the accuracy specifications of the temperature sensors. In other words, the USB-TC will provide the best measurement your sensor is capable of. The combination of t... |
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Introduction to Data Acquisition with LabVIEW CD-ROM $122.92 King's Introduction to Data Acquisition with LabVIEW teaches students how to measure physical properties with a computer based instrumentation system. It uses numerous examples and the National Instruments LabVIEW graphical programming environment to lower the barriers to learning and reduce the time required to successfully perform automated measurements. LabVIEW is a powerful graphical progra... |
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LabVIEW for Data Acquisition $40.00 The practical, succinct LabVIEW data acquisition tutorial for every professional. No matter how much LabVIEW experience you have, this compact tutorial gives you core skills for producing virtually any data acquisition (DAQ) application-input and output. Designed for every engineer and scientist, LabVIEW for Data Acquisition begins with quick-start primers on both LabVIEW and DAQ, and builds your... |
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