CLAD Data Acquisition & Instrument Control

Question 1

What is the primary purpose of a data acquisition (DAQ) device?

Accepted Answer

To convert analog signals to digital

Answer

The primary purpose of a data acquisition (DAQ) device is to bridge the gap between physical analog signals from the real world (like temperature, pressure, voltage) and the digital domain of a computer. It converts these continuous analog signals into discrete digital values that can then be processed, analyzed, and stored by software like LabVIEW. This enables computers to interact with and measure physical phenomena.

Question 2

Which LabVIEW API is commonly used for programming NI DAQ hardware?

Accepted Answer

NI-DAQmx

Answer

NI-DAQmx is the primary driver software and API (Application Programming Interface) developed by National Instruments for programming their DAQ hardware in LabVIEW and other environments. It provides a comprehensive set of VIs and functions for configuring, controlling, and acquiring data from NI DAQ devices, simplifying the process of interacting with the hardware.

Question 3

What is the function of the 'Sample Clock' in a DAQ task?

Accepted Answer

To set the sampling rate

Answer

The Sample Clock in a DAQ task determines how frequently analog input channels are sampled, effectively setting the sampling rate. A higher sample rate means more data points are collected per unit of time, providing a more detailed representation of the analog signal. This is crucial for accurately capturing dynamic signals without aliasing.

Question 4

Which of the following is a common analog input measurement type?

Accepted Answer

Voltage

Answer

Voltage is a very common type of analog input measurement because many physical phenomena can be converted into a proportional voltage signal using sensors (e.g., thermocouples for temperature, strain gauges for force). DAQ devices are designed to measure these varying voltage levels and convert them into digital data for analysis.

Question 5

What is the purpose of a DAQ Task in LabVIEW?

Accepted Answer

To configure the hardware and measurement parameters

Answer

A DAQ Task in LabVIEW (using NI-DAQmx) is a virtual channel or group of channels with timing, triggering, and other properties. Its purpose is to define and configure all the necessary parameters for a specific measurement or generation operation, such as which physical channels to use, the measurement type (e.g., voltage), sampling rate, and trigger conditions, before actual data acquisition begins.

CLAD Practice Test

CLAD Practice Test

CLAD Data Acquisition & Instrument Control