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Data Acquisition (DAQ)

Image Part Number Description / PDF Quantity Rfq
779678-01

779678-01

NI

NI USB-6218 ISOLATED BUS-POWERED

5
196203-03

196203-03

NI

NI USB-6211 OEM BUS-POWERED M SE

5
779081-01

779081-01

NI

NI PCI-6510 INDUSTRIAL 32 SOURCE

3
777387-01

777387-01

NI

PCI-DIO-96 AND NI-DAQ FOR WINDOW

2
H1750M-1

H1750M-1

DGH Corporation

24-BIT, DIGITAL I/O, MODBUS RTU

5
779513-01

779513-01

NI

NI PCIE-6259 M SERIES MULTIFUNCT

2
780108-01

780108-01

NI

NI USB-6216 ISOLATED BUS-POWERED

8
779973-01

779973-01

NI

NI USB-6225 M SERIES DAQ, SCREW,

4
779675-01

779675-01

NI

NI USB-6210 BUS-POWERED M SERIES

9
780055-01

780055-01

NI

NI USB-6289 M SERIES DAQ, SCREW

1
D1142M

D1142M

DGH Corporation

+/-10VIN, RS-485 OUT, MODBUS RTU

15
779974-01

779974-01

NI

NI USB-6225 M SERIES DAQ, MASS,

2
781044-01

781044-01

NI

NI PCIE-6321, X SERIES DAQ (16 A

5
195959-02

195959-02

NI

NI USB-6221 OEM M SERIES DAQ DEV

3
MDAQ300

MDAQ300

MagicDAQ

USB DAQ 14-BIT 48KS/S MULTIFUN

19
779976-01

779976-01

NI

NI PCIE-6509 96 CH, 5V DIO WITH

8
D6500

D6500

DGH Corporation

ANALOG OUTPUT, 2-CH, MODBUS RTU

5
779958-01

779958-01

NI

NI USB-6255 M SERIES DAQ, SCREW,

1
781445-02

781445-02

NI

NI USB-6366, X SERIES DAQ (8 SIM

2
778316-01

778316-01

NI

NI PCI-6703 AND NI-DAQ SOFTWARE

3

Data Acquisition (DAQ)

1. Overview

Data Acquisition (DAQ) refers to systems that convert physical phenomena (e.g., temperature, pressure, voltage) into digital data for analysis, monitoring, and control. Modern DAQ systems integrate hardware and software to sample, condition, and process signals. They are critical in scientific research, industrial automation, automotive testing, and medical diagnostics, enabling precise data-driven decision-making.

2. Main Types and Functional Classification

TypeFunctional FeaturesApplication Examples
Portable DAQCompact, battery-powered, USB/Wi-Fi connectivityField testing, mobile diagnostics
Modular DAQCustomizable slots for various I/O modulesProduction line monitoring
Virtual Instrument DAQSoftware-centric with PC-based processingLab experiments, R&D
Industrial DAQRuggedized, high noise immunityFactory automation, HVAC systems

3. Structure and Components

A typical DAQ system comprises:

  • Hardware: Sensors/transducers, signal conditioning circuits, analog-to-digital converters (ADC), processors (e.g., FPGAs), communication interfaces (Ethernet, PCIe).
  • Software: Driver layers (e.g., NI-DAQmx), data visualization tools, analysis algorithms (FFT, filtering), and storage modules.

Example: A vibration analysis DAQ system uses accelerometers, charge amplifiers, and a PXI chassis for signal processing.

4. Key Technical Specifications

ParameterDescriptionImportance
Sampling RateMeasure of data points captured per second (up to GSPS)Determines fidelity of high-frequency signals
ResolutionADC bit depth (12-24 bits)Impacts measurement precision
Input RangeVoltage/current range compatibilityEnsures sensor compatibility
IsolationElectrical separation between channelsProtects system from surges

5. Application Fields

  • Industrial: Machine condition monitoring (e.g., Siemens SIMATIC IOT2000)
  • Automotive: Crash test data logging (e.g., Kistler KiDAQ)
  • Medical: ECG signal acquisition (e.g., National Instruments PXIe-4143)
  • Aerospace: Flight test instrumentation (e.g., Curtiss-Wright DAQ systems)

6. Leading Manufacturers and Products

ManufacturerRepresentative ProductKey Features
National InstrumentsPXIe-63638-channel, 16-bit resolution, 2MS/s sampling
Keysight Technologies34972A LXI DAQ20-bit resolution, 250kS/s, modular design
Teledyne LeCroyHDO6000 DAQ12-bit ADC, 1GHz bandwidth oscilloscope integration

7. Selection Guidelines

Consider the following factors:

  1. Application Requirements: Determine signal types (analog/digital), environmental conditions (temperature, vibration).
  2. Performance: Match sampling rate/resolution to signal characteristics (e.g., audio vs. RF).
  3. Compatibility: Ensure interface alignment (USB, PCIe) and software support (LabVIEW, MATLAB).
  4. Scalability: Modular systems allow future expansion.
  5. Budget: Balance cost with precision needs (e.g., 24-bit ADCs for high-accuracy labs).

8. Industry Trends

Future DAQ systems will emphasize:

  • Smart Integration: AI-driven edge computing for real-time analytics.
  • Wireless DAQ: IoT-enabled systems with 5G/Wi-Fi 6 connectivity.
  • Miniaturization: MEMS-based sensors reducing DAQ size.
  • High-Speed ADCs: Adoption of 10+ GSPS converters for 5G and radar testing.
  • Cloud Compatibility: Direct integration with cloud platforms (AWS, Azure) for remote monitoring.
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