Chapter 1 Flashcards
What is the primary purpose of a data acquisition (DAQ) system?
The primary purpose is to measure physical phenomena such as light, temperature, pressure, or sound.
What are the main building blocks of a DAQ system?
Sensor/Signal, DAQ Hardware, Signal Conditioning, and DAQ Software.
How do sensors contribute to the data acquisition process?
They convert physical phenomena into electrical signals that can be measured by a DAQ system.
What types of physical phenomena can sensors measure?
temperature, force, position, sound, and light.
what is signal acquisition?
Signal acquisition is the process of converting physical phenomena into data that can be used by a computer
What are soft/Virtual sensors ?
computational devices which help us to measure and estimate quantities that are impossible/difficult to measure using physical sensors.
What are the requirements of RTD, thermocouple, strain gauge?
RTD - needs excitation current
Thermocouple- needs cold junction compensation
Strain gauge - wheatstone bridge
What are the two main categories of signals you need to identify before acquisition?
The two main categories are digital signals and analog signals.
What types of information can you obtain from a signal after categorization?
state, rate, level, shape, and frequency.
What type of information might you look for when analyzing a digital signal?
state and rate
What type of information might you look for when analyzing an analog signal?
shape, level and frequency
How would you measure the state of a digital signal in a switch-monitoring application?
When the switch is open, you measure 0 V (OFF), and when the switch is closed, you measure 5 V (ON),
What is an example of measuring the rate of a digital signal?
Using an encoder attached to a motor shaft to measure how fast the shaft is spinning
What type of device can convert rotary motion into a digital signal, and how does it work?
An encoder converts rotary motion into a digital signal by producing a series of alternating ON/OFF states (pulse train) for each increment of rotation.
