ADLINK DAQ-2000 Synchronous Sampling and Acquisition Card Selection Guide

The two channel analog output uses a 12 bit multiplication DAC and supports the following output ranges:

Internal reference: ± 10V or 0-10V;

External reference: ± AO_deTREF or 0~AO_deTREF (up to ± 10V external reference can be connected).

Dynamic performance:

Update rate: 1 MS/s (1 μ s update interval);

Pendulum rate: 20 V/μ s, establishment time 3 μ s (up to ± 0.5 LSB);

Driving capability: ± 5mA (capable of driving capacitive loads up to 1500pF).

Analog output also supports triggering (software, external digital/analog, SSI), as well as post triggering, delayed triggering, and repeated triggering modes, which can achieve synchronous excitation signal output with analog input, forming a complete closed-loop testing system. The output FIFO size is 2K sampling points and also supports DMA transfer.

Digital I/O and Timer/Counter

4.1 24 channel digital I/O

Based on the classic 8255 chip, it can be programmed into three 8-bit ports (PA, PB, PC), each of which can be independently configured as an input or output. The PC port can also be further divided into two 4-bit half bytes. All signals are 5V TTL compatible and can be read and written through software polling, suitable for controlling relays, indicator lights, reading switch status, etc.

4.2 2-channel 16 bit timer/counter

Each channel supports:

Internal 40MHz reference clock (programmable frequency division);

External clock input (up to 10MHz);

Multiple modes: event counting, frequency measurement, pulse width modulation, square wave generation, etc.

Typical applications include speed measurement, pulse width measurement, and generating synchronous pulses.

Multi card synchronization (SSI bus)

When more than 4 analog input channels or 4 analog output channels are required, up to 4 DAQ-2000 series cards can be connected through the SSI (System Synchronization Interface) bus to achieve cross card synchronous sampling/updating. The SSI bus transmits the sampling clock, trigger signal, and synchronization status to ensure that all cards operate at the same time base with extremely low phase deviation between channels.

The matching SSI bus cables include ACL-SSI-2, ACL-SSI-3, and ACL-SSI-4, which support synchronization of 2, 3, and 4 cards respectively. When in use, simply connect the SSI interfaces of each card in series through cables and set the synchronization mode on the main card, and the slave cards will automatically follow. This is extremely practical for multi-channel array acquisition, such as sonar, radar, and multi axis vibration.

Software development and driver support

ADLINK provides a comprehensive software stack for the DAQ-2000 series:

D2K-DASK: Core driver and API library for Windows 98/NT/2000/XP/2003, supporting mainstream languages such as VB/VC+/BCB/Delphi.

D2K-DASK/X: Linux version, suitable for open source systems.

DAQ-LWIEW PnP: VI driver in LabVIEW for quickly building graphical programs.

DAQ-MTLB: MATLAB toolbox for algorithm validation and data analysis.

DAQPench: ActiveX control package, which allows drag and drop programming in Visual Studio.

All drivers support advanced features such as Scatter Gate DMA, automatic calibration, and trigger configuration, and provide rich sample programs to greatly shorten the development cycle.

Terminal board and wiring

The matching DIN-68S/1M terminal board provides a 68 pin SCSI-II connector and supports DIN rail installation. It comes with a 1-meter ACL-10568 shielded cable. Screw connection terminals are provided on the terminal board for easy connection of on-site sensors and actuators. It is recommended to use shielded twisted pair cables to connect analog signals and connect the shielding layer to the AGND of the terminal board at one end to reduce noise coupling.

Typical application cases

Multi channel dynamic signal acquisition: Four piezoelectric accelerometers are simultaneously connected to DAQ-2016, with a sampling rate of 800kS/s. They are used in conjunction with pre triggering to capture the waveform at the moment of machine tool impact for fault diagnosis.

Servo system characteristic testing: Use the analog output of DAQ-2010 to generate swept sine excitation (through AO0/AO1), and collect encoder or LVDT feedback signals through AI0-AI3 to measure the frequency response function.

Battery monitoring: DAQ-2006 samples 4 battery voltages (differential input) at 250kS/s, and combines digital I/O to control load on/off, achieving charge and discharge curve recording.

Multi card synchronous array: Two DAQ-2016 chips are synchronized through SSI to achieve synchronous acquisition of 8-channel vibration signals for large-scale structural modal analysis.

Calibration and maintenance

The DAQ-2000 series supports fully automatic calibration without the need for any external voltage source or potentiometer. Onboard high-precision reference source (temperature drift ± 2 ppm/℃, long-term stability 6 ppm/1000 hours), can be used to complete gain and offset correction of input/output channels by calling the AutoCalibration function in software. It is recommended to perform calibration once a year or when the ambient temperature changes by more than 10 ℃ to ensure accuracy indicators.