National Instruments NI myRIO, Essentials Manual

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82 CHAPTER 11. DMM TEST STAND
Functional Requirements: The DMM Test Stand will:
1. Accept an image of the LCD or LED display of a DMM,
2. Display the image with a compound ROI overlay, one for each digit of
the display,
3. Display the detected active segments,
4. Continually run the following measurement sequence while the sweep
button is pressed:
(a) Increment the analog output (AO) voltage by the user-supplied AO
step value,
(b) Wait for the meter display to stabilize,
(c) Read the meter and save the measured voltage to an array, and
(d) Update the plot of measured versus applied voltage.
5. Display the AO voltage applied to the meter and the numerical value read
from the meter,
6. Clear the measurements and initialize the analog output voltage to the
user-supplied AO start voltage when clear is pressed, and
7. Run a single measurement sequence when the step button is pressed.
Required Resources:
1. NI LabVIEW and NI Vision Assistant
2. NI myRIO with power supply and USB cable
3. USB webcam and tabletop camera copy stand
4. Hand-held DMM with LCD or LED display
Deliverables:
1. Lab report or notebook formatted according to instructor’s requirements;
include front-panel screen shots to demonstrate that your application
meets functional specifications
2. .zip archive file containing all project files:
(a) Representative images
(b) Vision Assistant script
(c) LabVIEW project file set