Data Acquisition System

 

 



Data Acquistion

DAQ or DAC - abbreviations for Data Acquisition.

DAQ is a means of inputting and outputing electronic signals to and from the real world, this is why it is also called I/O - Input and Output.

Systems that use DAQ data are automated or programmed devices like PCs, PLCs, PACs, Tablets, Embedded Micros, Industrial Computers, even Win 8, Android & Apple Smart Phones and iPods now.

Instrumentation like DVM, DMM, Scopes, Generators etc are special types of DAQ devices, either converting real world signals or generating real world electronic signals. See Instruments

Many of these instruments can be interfaced directly to programmable devices like Computers, Smart Phones, Tablets etc using various interfacing methods - RS-232/485, Canbus, GPIB, USB, Ethernet & Wifi and Bluetooth Wireless.

 

Some examples of real world signals (data) :-

 

  • Analog in and out - 0-10VDC, +/-10VDC, 230VAC, +/-10 Amps DC or AC and 4-20mA
  • Digital out - DC Levels such as TTL/CMOS, Higher voltage DC using Open Collector or FET, AC or DC voltages using Relay, SSR etc
  • Digital in - TTL/CMOS, Isolated volts or current DC or AC, Dry contacts
  • Digital timing I/O, on/off, pulse stream, PWM
  • Digital timing I/O, on/off, counting, period or frequency
  • Digital quadrature for encoders giving distance and direction.
  • Analog Conditioning for transducers and sensors like strain gauges, RTDs, TCs, Thermistors etc

How Data Acquistion Works

DAQ systems take Input signals and convert them into bits (numbers) and store them into memory inside the programmable device.
or

Take digital data inside a programmable device and generate Output signals represented by the data.

Interface Methods

Various interfacing means are used to connect DAQ devices to PCs, PLCs, PACs, Micros, Industrial Computing etc.

The most common methods to connect DAQ devices or boards are:-

  • Sockets - ISA, PCI, PCIe, PXI, cPCI, VXI, PCMCIA, Cardbus
  • Embedded Sockets - PC-104, PC-104+, ITX, and many more
  • UART Ports - RS-232, 422, 485, CanBUS, ModBus
  • HDR - High Data Rate Ports - USB, Ethernet
  • T&M Instruments - IEEE-488 - GPIB
  • Local Wireless - WiFi, Bluetooth, Zigbee.
  • Remote Wireless DAQ - GSM and 3/4G

Types of DAQ converters

There are four main types of converters for DAQ.

SAR =Successive Approximation, used for general purpose applications, can be accurate and fast.

Flash - Used for ultra high speed measurement

Integration - Used in high accuracy devices -DMMs.

Sigma Delta as used in PC sound systems and almost all audio equipment. Very accurate, low noise.

Trends in DAQ

It was very common a few years back to have one converter and a MUX or multiplexer feeding that one converter to make multichannel systems.

Now that the cost is low for ADC or DAC converters, many DAQ units have converter s on each channel, allowing for simultaneous channel sampling, and it removes a layer of in accuracy the MUX added.

Sourcing DAQ

If you want MasTec to source a special DAQ/DAS product for you, just email and we will act as your sourcing agent.

Our Range of DAQ

MasTec has the largest range of DAQ you will find anywhere in the world. No other company has such a broad range or brands and product.

The DAQ companies have been listed A-Z and their main types of connections are highlighted. However when searching for DAQ, there is no substitute for asking for your specific needs or doing research on the all the web pages we have using the links.

Stocking

We stock Adlink, Dataforth, Digi, Labjack, MCC, OPTO 22, Pencom, Sealevel and in many cases can provide DAQ on next day delivery.

Manufacturers

Listed by interface types and some special notes

 

         
 DAQ Front Page     Transducer Sensor Gauges Encoder Front page    
         
 The Range        
A very complete range of high quality Socket based, USB, Ethernet DAQ units for PCs and many many Embedded form factors.   Sockets PCI, PCIe, PXI +Embedded Sockets
UART Ports
Embeeded Forma factors
High Data Rate Ports = USB and Ethernet
   Accesio
         
A very complete range of high quality Socket based DAQ units for PCs and Embedded work. New releases on USB DAQ, plus a broad range of UART 485 DAQ DIN Rail modules for industry and laboratory work.   Sockets PCI, PCIe, PXI +Embedded Sockets
UART Ports
High Data Rate Ports = USB and Ethernet
   ADlink
A very complete range of high quality Socket based DAQ units for PCs and Embedded work. New releases on USB DAQ, plus a broad range of UART 485 DAQ DIN Rail modules for industry and laboratory work. Plus speciality DAQ for PAC and distributed IO systems using 485 or ethernet.   Sockets PCI, PCIe, +Embedded Sockets
UART Ports
High Data Rate Ports = USB and Ethernet
  Advantech
RS-232/485 adn USB DAQ   UART Ports
High Data Rate Ports = USB and Ethernet
   B&B
High Galvanic Isolation with Transducer and Sensor direct inputs, TCs, RTDs, Strain, mV, V, mA, A, ptoentiometer, LVDT, and more.   UART Ports
High Data Rate Ports = USB and Ethernet
   Dataforth
High Voltage AC & DCDAQ
Galvanic Isolation
Transducer and Sensor direct DAQ
  UART Ports
High Data Rate Ports = USB and Ethernet
   DataQ
Wireless Zigbee and Digi Mesh DAQ Endpoints   Wireless Mesh    Digi
A very complete range of high quality Socket based DAQ units for PCs and Embedded work. New releases on USB DAQ, plus a broad range of UART 485 DAQ DIN Rail modules for industry and laboratory work plus wireless DAQ   Very broad range
Sockets PCI, PCIe, +Embedded Sockets
High Data Rate Ports = USB and Ethernet
   Eagle Technology
A large range or RS-485, Ethernet and speciality DAQ units and IO.   Modbus RS-232/485 and TCP, and Ethernet    Exemys
A large range or RS-485, Ethernet and GPIB speciality DAQ units and IO.   Sockets - UART Ports - Software Driven Ports - GPIB    ICS
A large range or RS-485, Ethernet and speciality DAQ units and IO. FRnet and Magic cable devices plus Modbus and Profibus DAQ   Sockets PCI, PCIe, ISA
Modbus, RS-485, USB, Profibus and Ethernet
   ICPDAS
High Channel Count DAQ
Transducer and Sensor direct DAQ
Plus an excellent range of Loggers & Recorders
  Sockets PCI, PCIe
High Data Rate Ports = USB and Ethernet
   IOTech
Excellent USB laboratory grade DAQ units.   High Data Rate Ports = USB and Ethernet    LabJack
The complete solution 
Sockets - Embedded Sockets - UART Ports - HDR Ports - Local Wireless .
+++ Transducer ready input boards and more
+++ Android DAQ
  Sockets PCI, PCIe, +Embedded Sockets
UART Ports = RS232, 422, 485 Canbus
High Data Rate Ports = USB and Ethernet
Local Wireless - WiFi, Bluetooth
   Measurement Computing
A leader in all types of DAQ products   Sockets PCI, PCIe, +Embedded Sockets
UART Ports
High Data Rate Ports = USB and Ethernet
Transducer ready input boards
   National Instruments
A very complete range of high quality Socket based DAQ units for PCs and Embedded work. New releases on USB DAQ, plus a broad range of UART 485 and ethernet DAQ DIN Rail modules for industry and laboratory work.   Sockets PCI, PCIe, +Embedded Sockets
UART Ports
High Data Rate Ports = USB and Ethernet
Transducer ready input boards
   Omega
Industrial and Lab Grade
PAMUX Parallel
OPTOMUX RS-485
SNAP Ethernet
The leader inPAC DAQ with modules to build complete low to super high channel count industrial and laboratory systems.
  UART Ports
High Data Rate Ports = USB and Ethernet
   OPTO 22
RS-232 relay boards - 8 power relays.   UART Ports    Pencom
The complete solution 
PAC DAQ high channel count expansion modulkes
Socket PC and embedded DAQ
USB DAQ
Modbus DAQ
Ethernet DAQ
  Sockets PCI, PCIe, +Embedded Sockets
UART Ports
High Data Rate Ports = USB and Ethernet
Transducer ready input boards
  Sealevel Systems
Extremely powerful solutions

PCI, PCI-e, PC-104
Ethernet DAQ plus a range of conditioning ethernet modules
  Sockets PCI, PCIe, + PC-104

High Data Rate Ports = Ethernet

Transducer ready input boards
  Sensoray
A world leader in high speed DAQ and DSP
Real Time DSP with DAQand Signal filters
.
1800 MFLOP DSP
  Sockets PCI, PCIe, +Embedded Sockets
Ports = USB and Ethernet
   Sheldon Instruments
Wireless DAQ for Rotating Devices   Wireless DAQ    Summation

  © MasTec Ltd