Introduction to NI ELVIS
Dr. Kevin Craig
Greenheck Chair
in Engineering Design
&
Professor of Mechanical Engineering
Marquette University
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DAQ
• What is DAQ?
– DAQ (data acquisition) systems capture, measure,
and analyze physical phenomena from the real world.
– Light, temperature, pressure, and torque are
examples of the different types of signals that a DAQ
system can measure.
– Data acquisition is the process of collecting and
measuring electrical signals from sensors and test
probes, and sending them to a computer for
processing.
– Data acquisition may also include the output of
analog or digital control signals.
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Virtual Instrumentation
• Virtual Instrumentation is defined as the combination of
measurement and control hardware and application
software with industry-standard computer technology to
create user-defined instrumentation systems.
• Virtual Instrumentation provides an ideal platform for
developing instructional curriculum and conducting
scientific research.
– Tools must be flexible and adaptable, both in instructional labs,
where experiments combine measurement, automation, and control,
but also in research environments, where the needs are
unpredictable.
– Modularity, and hence new functionality, and economy are important
attributes.
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Traditional Instrumentation
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NI ELVIS
Engineering System Investigation Process
START HERE
Physical
System
System
Measurement
Parameter
Identification
Physical
Model
Mathematical
Model
LabVIEW
Measurement
Analysis
Mathematical
Analysis
Comparison:
Predicted vs.
Measured
Design
Changes
YES
Is The
Comparison
Adequate ?
NO
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NI ELVIS II
Design and Prototyping Platform for Engineers
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Variable Power Supply
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Digital Multimeter
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Function Generator
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Arbitrary Waveform Generator
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Oscilloscope (Time-Response Plots)
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Bode Analyzer (Frequency-Response Plots)
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DSA – Dynamic Signal Analyzer
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Impedance Analyzer
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Time Domain – Frequency Domain VI
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ELVIS Breadboard
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Indicates Continuity
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ELVIS Exercises
• Measurement of Component Values with the DMM
– Resistor (1.0 kΩ and 2.2 kΩ)
– Measure component values using the DMM by
connecting the components across the Banana A and
Banana B inputs.
– Resistors in Series and Parallel
• Building a Circuit and Measuring Voltage and Current
using the DMM
– Measure Voltage Source and Current Through Single
Resistor
– Voltage Divider Circuit
– Current Divider Circuit
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Measuring Resistance
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Resistors in Series
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Resistors in Parallel
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Current Divider
Iin = I1 + I 2 = Iout Iin
R1
eout
ein
R2
= ein
R1 + R 2
I1
R2
R1
Introduction to NI ELVIS
I2
eout
R2
I1 = Iin
R1 + R 2
Voltage Divider
R2
Iout
R1
I 2 = Iin
R1 + R 2
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Using the DMM to Measure Voltage
Banana A
Banana B
Using the DMM to Measure Current
Banana B
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Banana C
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DC Voltage Divider
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Measuring Current through a Resistor
5 volts
i=
= 0.005122 A
0.9762 kΩ
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Current Divider
5 volts
i=
= 0.007359 A
0.6794 kΩ
⎛ R2 ⎞
i1 = i ⎜
⎟
R
R
+
1
2
⎝
⎠
975.9
⎛
⎞
= ( 0.007359 ) ⎜
⎟
⎝ 2168.7 + 975.9 ⎠
= 0.002284 A
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• Time Response of a Voltage Divider
– Response to a Square Wave Input (Step Response)
and Sine Wave input
• ELVIS Connections
– Circuit Input to FGEN
– FGEN to Analog Input Signal AI 6+
– Measured Signal to Oscilloscope AI 7+
– Oscilloscope AI 7- and AI 6- to DC Ground
– Circuit Ground to DC Ground
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Time Response
Function Generator
FGEN
Oscilloscope
Channel AI 6+
Oscilloscope
Channel AI 7+
DC Ground
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Oscilloscope
Channels AI 7- and AI 6K. Craig
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Voltage Divider Time Response
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• Frequency Response (Bode Plot) of a Voltage
Divider
– ELVIS Connections
• FGEN to Circuit Input
• Measured Signal to Analog Input Signal AI 0+
• FGEN to Analog Input Signal AI 1+
• DC Ground to Analog Input Signals AI 0- and AI 1and circuit ground
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Frequency Response
Function Generator
FGEN
Analog Input Signal
AI 1+
DC Ground
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Analog Input Signal
AI 0+
Analog Input Signals
AI 0- and AI 1K. Craig
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Voltage Divider Frequency Response
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Semi-Log Paper
1.0
1.1
1.2
10
1.0
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1.3
1.4
1.5
1.6
1.7
50
20
30
40
1.301
1.477
1.602
log10
1.8
60
1.9
2.0
70 80 90 100
1.699 1.778 1.845 1.903
2.0
1.954
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