Voltage data acquisition

LabVIEW is a graphical programming language designed by National Instruments for scientific and engineering data gathering and reduction. The diagram to the left shows how it interconnects with other software on a computer and to external long term effects of stimulants on the brain. LabVIEW communicates through normal computer peripherals such as screen, keyboard, mouse, and printer and can also read and write data from and to computer storage media.

Other hardware is required to be added using exapansion ports. DAQ devices are multifunction devices that are capable of digitising signals from external analogue transducers, generating analogue voltage outputs, and have various TTL digital signals ports which can be configured to read or send pulses and used for clock timing purposes.

There are a wide variety of different devices which differ in price depending on their capabilities. PCI cards generally require a separate breakout box to which are connected the signal lines from any sensors and devices connected to it.

The USB equivalent has the breakout box integrated with the device but otherwise connects in the same way. In this system a controller card is plugged into the computer and proprietory commands are sent to individual instruments which do all hg8245q2 password data collection themselves.

These instruments are made by several manufacturers and each are connected by its own 16 core cable to the controller. Writing programs in LabVIEW can be made relatively simple if the built in functions and examples are exploited.

This page shows one way of doing this for a data acquisition program. The program is intended to be used to calibrate a sensor. Several readings are to be taken over a period of time and averaged to get each point. After each point is logged a graph will update showing the relationship between the input applied and the output it causes. Figure 1. LabVIEW comes with several examples of its functionality and one of these will almost certainly be ready to use, after a little manipulation, for any purpose required.

Choosing one of these to collect data is step 1. This is for version 7. Clicking the arrow next to the Help Figure 2 shows the Example Finder window which has various ways of looking for examples. Usually browsing by task - left side of the window as shown - is the best method. There are various means of taking analogue measurements of which voltage is the most basic.The following instruNet hardware supports Resistance Measurements with the help of an external shunt resistor :.

For quick setup instructions, click here. Resistance measurement using a voltage divider involves connecting a resistor of unknown value in series with an external user supplied shunt resistor of known value, applying a voltage across the voltage divider circuit, and measuring the voltage across R unknown i.

To do a Resistance measurement using a Voltage Divider, you must wire your sensor per the above diagram and then set up your software via the Interview process started after selecting sensor type in Channel Setup dialog or by manually running through the below steps:. Set the Sensor field in the Hardware settings area to Resistance. Set the Wiring field in the Hardware settings area to Voltage Divider. Set the Rshunt field in the Constants settings area to the value of your external user supplied R shunt resistor, in ohms units.

If working with hardware that has variable internal excitation e. Alternatively, if applying an external excitation voltage, enter -R o value in the Ro edit field e.

Set the Measurement Range in the Hardware settings area. For details, click here. Wire your sensor per the above figures. Click here if you need more guidance setting up the software, and click here if the measured value is not correct If you want a detailed report on your setup, press the Sensor Report button in the Channel Setup dialog. An alternative to the above technique is to use a Bridge circuit to measure small resistance changes from a nominal value e.

Resistance measurement using a bridge circuit involves connecting a resistor of unknown value as one leg of a full-bridge circuit, applying a voltage across the bridge, and measuring the voltage across the two intermediate nodes.

In the below figure, R unknown is a resistor whose value is being measured and R o is a similar valued resistor of known value. If you need to measure a resistance with more range, please use the Resistance Measurement using a Voltage Divider, described above. Resistance Measurement - Bridge Circuit. Set the Wiring field in the Hardware settings area to Bridge. Set the Ro field in the Constants settings area to the value of one R o bridge completion resistor, in ohms units. Wire your voltage source per the above Bridge figure.

Isolated, Industrial Voltage Level Data Acquisition System

Click here if you need more guidance setting up the software, and click here if the measured value is not correct.The toolbox apps let you interactively configure and run a data acquisition session. You can access device-specific features and synchronize data acquired from multiple devices. You can analyze data as you acquire it or save it for post-processing.

You can also automate tests and make iterative updates to your test setup based on analysis results. Interactively configure and run your data acquisition interface without writing code, then generate the equivalent MATLAB code to automate your acquisition in the future.

Configure device channels, preview signals, and record analog input data in the foreground or background.

Data Acquisition

Configure device channels, define and preview signals, and generate analog output signals in the foreground or background. Design audio test systems, acquire multichannel audio data, and generate signals using built-in or external sound cards. Use data acquisition hardware from National Instruments and other vendors.

Access subsystems common to different devices as well as device-specific features. Collect and process data directly from thermocouples, RTD devices, IEPE accelerometers and microphones, current-based sensors, and bridge-based sensors. Record data in physical units such as pascals and gravities. Measure strain, pressure, and force from strain bridges, load cells, and other sensors and transducers.

Measure temperature from thermocouples and resistive temperature devices RTDs in physical units such as degrees Celsius. Generate and read digital signals. Use counters to count events or to measure frequency, pulse width, or position. Generate pulse trains with counter outputs.

Acquire quadrature encoder position, count edges, measure frequencies and pulse widths, and generate pulses. Use analog input and analog output subsystems of your DAQ device to acquire and generate voltage and current signals. Queue output data, acquire in the foreground or background, and log data to disk. Acquire and generate voltage signals on analog input and analog output channels of your DAQ device. Acquire and generate current signals on analog input and analog output channels of your DAQ device.

voltage data acquisition

Synchronize operations with shared start triggers and shared scan clocks. Simultaneously start all devices in a session and synchronize operations on all connected devices.

Arduino Based Data Acquisition

Discover hardware and initiate foreground and background data acquisition with a simplified interface. Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select:.

voltage data acquisition

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Toggle Main Navigation. Data Acquisition Toolbox.Data acquisition systems accurately capture the signals generated by electronic devices and sensors for real-time processing, hardware-in-the-loop simulation, automated test, and data logging.

Analog Devices, the world-leader in data conversion and signal processing products, offers a wide array of data acquisition system solutions for different form factors and sensor interfaces.

These include:. The AD provides a single configurable and reusable data acquisition DAQ footprint, which establishes a new industry standard in combined ac and dc performance and enables instrumentation and industrial system designers to design across multiple measurement variants for both isolated and nonisolated applications. The AD achieves a The AD offers the user the flexibility to configure and optimize for input bandwidth vs. The flexibility of the AD allows dynamic analysis of a changing input signal, making the device particularly useful in general-purpose DAQ systems.

The selection of one of three available power modes allows the designer to achieve required noise targets while minimizing power consumption.

The design of the AD is unique in that it becomes a reusable and flexible platform for low power dc and high performance ac measurement modules. The AD achieves the optimum balance of dc and ac performance with excellent power efficiency.

The following three operating modes allow the user to trade off the input bandwidth vs. The AD offers extensive digital filtering capabilities that meet a wide range of system requirements. The filter options allow configuration for frequency domain measurements with tight gain error over frequency, linear phase response requirements brick wall filtera low latency path sinc5 or sinc3 for use in control loop applications, and measuring dc inputs with the ability to configure the sinc3 filter to reject the line frequency of either 50 Hz or 60 Hz.

All filters offer programmable decimation. This path is quantization noise limited. Therefore, it is best suited for customers requiring minimum latency for control loops or implementing custom digital filtering on an external field programmable gate array FPGA or digital signal processor DSP.

When using the AD, embedded analog functionality within the AD greatly reduces the design burden over the entire application range. The precharge buffer on each analog input decreases the analog input current compared to competing products, simplifying the task of an external amplifier to drive the analog input. A full buffer input on the reference reduces the input current, providing a high impedance input for the external reference device or in buffering any reference sense resistor scenarios used in ratiometric measurements.

The device operates with a 5. The device requires an external reference. The high throughput allows both accurate capture of high frequency signals and decimation to achieve higher SNR, while also reducing antialiasing filter challenges.Configure, price, and purchase your data acquisition system online. Contact us for a wide range of technical support and assistance regarding your application. Select your region below to view a list of Regional distributors in your area.

Use our toll free number and online request form. Dataforth competitve cross-reference data. Locate factory test data for a specific Dataforth module using a serial number lookup.

Online application to request a line of credit with Dataforth. In this application, a MAQ20 Data Acquisition and Control System along with DSCA Signal Conditioning Modules, standard sensors, and actuators control the combustion process of a batch fed cordwood boiler to optimum efficiency throughout a burn cycle by means of a draft inducer blower and modulation of primary and secondary air dampers. Experience the MAQ20 in Action! To demonstrate the power of the MAQ20, we have create two real-time demonstrations that you can use and interact with here on our website.

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voltage data acquisition

Can't find what your looking for? Support Technical Support Contact us for a wide range of technical support and assistance regarding your application. Cross Reference Dataforth competitve cross-reference data.

Online Services Test Data Sheets Locate factory test data for a specific Dataforth module using a serial number lookup. Open a Credit Account Online application to request a line of credit with Dataforth. Application Notes. Tech Notes. DIN rail mounted and ideal for rugged factory, process, and machine automation; military and aerospace, power and energy, oil and gas, and environmental monitoring applications.Forgot Password?

Create an Account. Shopping Cart Summary. Sign In Username. Item s Added To Your Cart. Continue Shopping. View Cart. Skip Navigation Links. Whether you are measuring current, voltage, temperature, strain or digital signals, MCC offers high-quality hardware with accompanying software and drivers for a quick and customizable data acquisition solution for your unique application.

What is Data Acquisition? Data acquisition, or DAQ as it is often referred, is the process of digitizing data from the world around us so it can be displayed, analyzed, and stored in a computer.

A simple example is the process of measuring the temperature in a room as a digital value using a sensor such as a thermocouple. Modern data acquisition systems can include the addition of data analysis and reporting softwarenetwork connectivity, and remote control and monitoring options. As the name implies, this chip takes data from the environment and converts it to discrete levels that can be interpreted by a processor.

These discrete levels correspond to the smallest detectable change in the signal being measured. The resolution of an ADC is essentially analogous to the ticks on a measuring stick. A measuring stick with mm tick marks has more resolution than a measuring stick with only cm tick marks. Whether you need mm or cm tick marks depends on what you are measuring — the same is true for ADC resolution.

8-Channel Thermocouple/Voltage Input USB Data Acquisition system

Sensors Transducers Sensorsoften called Transducers, convert real-world phenomenon like temperature, force, and movement to voltage or current signals that can be used as inputs to the ADC. Common sensors include thermocouples, thermistors, and RTDs to measure temperature, accelerometers to measure movement, and strain gauges to measure force.

Signal Conditioning To make quality measurements on transducers, additional circuitry is often needed between the transducer and the ADC. Different sensors have different signal conditioning needs. For instance, signal conditioning for a strain gauge requires excitation, bridge completion and calibration. Thermocouples, which output signals in the mV range, need to be amplified as well as filtered before going through the ADC.

Many times, signal conditioning circuitry is contained within a data acquisition device, but signal conditioning may also be part of the transducer. Load cells, for example, contain the bridge completion, calibration circuitry, and amplification. Many MEM micro-electro-mechanical sensors also contain signal conditioning. Data Acquisition Options There are a wide variety of systems to choose from: Data Loggers Data Logging is the recording of collected data over a period of time.

Depending on the application, the data can be temperature measurementsvoltages, current, humidity, or other signals of interest. A Data Logger is a self-contained data acquisition system with a built-in processor and pre-defined software embedded in the unit.

Data loggers can run as stand-alone devices and are popular because they are portable and easy to use for specific tasks. All data loggers have local storage to save data and some include SD slots for additional memory.

Web-enabled data loggers can be configured and share data over a network. For additional portability, some data loggers are battery-powered. Data Acquisition Devices A data acquisition device USB, Ethernet, PCI, etc contains signal conditioning and an analog to digital converter, but needs to be connected to a computer to function. These devices are very flexible and can be used in many different applications which this makes them a popular choice.I love data.

Measuring things, plotting the results in a way to instantly visualize the behavior, and — most importantly — analyzing the results. Maybe it's because of my physics training, but even as old as I am, I still get a thrill when I can measure something and have it match the predictions of a simple model.

This is especially exciting when I can collect the measurements by computer and utilize the power of easy-to-use yet powerful tools to perform the plotting and analysis. Figure 1 is an example of the measured voltage from a modified speaker with a large hanging mass that is part of the sensor I use in a seismometer project.

This is the transient response of the system when perturbed, showing the damped oscillations. Measured response from the speaker and the fit to an ideal damped oscillator model.

The setup for this measurement is shown in Figure 2. I used an analog front end to convert the induced current from the speaker into a voltage in the range an Arduino can measure with its analog pin. A complete measurement system consisting of the sensor modified speakerthe analog front end an op-amp mounted in a breadboardthe data acquisition system my Arduinoand a scope used for diagnostics and debugging.

From the measured data, I can fit the resonant frequency and q-factor for an ideal damped oscillator. The agreement of this simple ideal model and this real physical system is really remarkable. At the heart of this process is bringing the data into the computer.

This makes Arduinos potentially great platforms for sensor data acquisition. When I started down this path to use an Arduino as a data acquisition system, the stumbling block for me was how to get the data from the Arduino directly into an analysis tool like Microsoft Excel. Did I mention I wanted it to be easy?

The problem was that I found too many ways of doing this. They generally fell into three categories: in real time through the serial port; data logging into an SD card; or by Wi-Fi into the cloud.

While data logging or sending the data to a cloud server are really cool, for my first application I wanted to use my Arduino as a tethered data acquisition unit and suck out the data over the USB cable. Programming the Arduino to print data to the serial port — while there are a few timing limitations — is easy. Did I mention I wanted an easy process? Then, there were the stand-alone tools that folks had written to read the serial terminal, parse the numbers, and display them in various ways.

I spent time playing around with many of these tools. My criterion was I wanted to look at the data in real time as it came out of the Arduino, and display it in a high quality plot — preferably Excel compatible. Plus, I wanted the learning curve to be at most five minutes with minimal additional code I had to add to my Arduino sketches.

Did I mention I wanted it easy?

voltage data acquisition


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