What is the DAQ Assistant? What is the difference between the block diagram and

ID: 1846734 • Letter: W

Question

What is the DAQ Assistant?
What is the difference between the block diagram and front panel?
On the block diagram of a VI, why are the terminals for the front panel objects different colors
What are colors used to indicate the data types of wires, inputs, and outputs?
What does the DAQ Assistant do? How is it useful over the legacy acquisition methods?
What does FFT stand for and what does it do to a real-time signal? Sketch the output of an FFT analysis performed on a 100 Hz sinewave signal at 1 V.

The purpose of data acquisition is to measure an electrical or physical phenomenon such as voltage,

current, temperature, pressure, or sound. PC-based data acquisition uses a combination of modular

hardware, application software, and a computer to take measurements. While each data acquisition

system is defined by its application requirements, every system shares a common goal of acquiring,

analyzing, and presenting information. Data acquisition systems incorporate signals, sensors,

actuators, signal conditioning, data acquisition devices, and application software.

Execution is determined by the structure of a graphical block diagram

n the front panel allow an operator to input

data into or extract data from a running virtual instrument. However, the front panel can also serve

as a programmatic interface. Thus a virtual instrument can either be run as a program, with the front

panel serving as a user interface

. This implies each VI

can be easily tested before being embedded as a subroutine into a larger program.

blue and red

One benefit of LabVIEW over other development environments is the extensive support for accessing

instrumentation hardware. Drivers and abstraction layers for many different types of instruments

and buses are included or are available for inclusion. These present themselves as graphical nodes.

The abstraction layers offer standard software interfaces to communicate with hardware devices.

The provided driver interfaces save program development time. The sales pitch of National

Instruments is, therefore, that even people with limited coding experience can write programs and

deploy test solutions in a reduced time frame when compared to more conventional or competing

systems. A new hardware driver topology (DAQmxBase), which consists mainly of G-coded

components with only a few register calls through NI Measurement Hardware DDK (Driver

Development Kit) functions, provides platform independent hardware access to numerous data

acquisition and instrumentation devices. The DAQmxBase driver is available for LabVIEW on

Windows, Mac OS X and Linux platforms

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