DAKOTA ULTRASONICS PVX-B Manual de usuario

OPERATION MANUAL

DAKOTA ULTRASONICS

X-

-B

Precision Visual Thickness Gauge

P/N P-195-0002 Rev 1.0, September 2014

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CHAPTER ONE INTRODUCTION......................................................................1

CHAPTER TWO QUICK STARTUP GUIDE.......................................................2

CHAPTER THREE KEYBOARD, MENU, & CONNECTOR REFERENCE.......11

CHAPTER FOUR PRINCIPALS OF ULTRASONIC MEASUREMENT ............20

CHAPTER FIVE SELECTING THE MEASUREMENT MODE..........................23

CHAPTER SIX MAKING MEASUREMENTS....................................................26

CHAPTER SEVEN USING THE DIGITS & B-SCAN DISPLAYS......................38

CHAPTER EIGHT THRU PAINT MEASUREMENT TECHNIQUE ...................51

CHAPTER NINE ADDITIONAL FEATURES OF THE PVX-B...........................52

CHAPTER TEN DATA STORAGE – SETUP, EDIT, & VIEW GRIDS...............57

CHAPTER ELEVEN SETUPS – CREATE, STORE, EDIT, & RECALL............74

CHAPTER TWELVE USING THE UTILITY SOFTWARE.................................81

APPENDIX A - VELOCITY TABLE ...................................................................82

APPENDIX B - SETUP LIBRARY.....................................................................84

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CHAPTER ONE

INTRODUCTION

The Dakota Ultrasonics model PVX-B is a precision ultrasonic thickness gauge with a

time based B-Scan and alpha numeric data logger. Based on the same operating

principles as SONAR, the PVX-B is capable of measuring the thickness of various

materials with accuracy as high as 0.0001 inches, or 0.001 millimeters. The

principle advantage of ultrasonic measurement over traditional methods is that

ultrasonic measurements can be performed with access to only one side of the

material being measured.

Dakota Ultrasonics maintains a customer support resource in order to assist users

with questions or difficulties not covered in this manual. Customer support may be

reached at any of the following:

Dakota Ultrasonics Corporation

1.1 Disclaimer

The PVX-B is a full-featured precision thickness gauge with a great deal of features

and measurement modes allowing a great deal of control over the functionality and

electronic performance of the instrument. As this provides the user greater control

and versatility for a variety of applications, it also requires that the user be

comfortable with the operation of these features and modes when operating the

instrument. It is strongly recommended that the contents of this manual be read in its

entirety. It is also recommended that a sufficient amount of time be allocated to

working with the instrument in a test environment prior to use in the field.

Responsibility for proper use of the instrument and recognition of this phenomenon

rest solely with the user of the instrument.

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CHAPTER TWO

QUICK STARTUP GUIDE

Turn the PVX-B on and off using the switch located on the bottom right corner of the

keypad. When PVX-B is initially turned on, a flash logo and blinking lights will be

displayed prior to entering into the main measurement screen. Note: This section is

primarily written as a basic startup guide only.

2.1 Selecting the Transducer Type

The first step in using the PVX-B is to select the transducer type stored in a setup.

There are 18 factory setups containing different transducer types that can be loaded,

modified and stored in a new setup location. By selecting the transducer type from a

predefined setup list, the PVX-B can recall specific properties about the transducer,

setup the display area and predefined scope settings. Note: Once the transducer

has been selected, the PVX-B will store and recall this setup, containing the

transducer type, every time the PVX-B is powered on/off. This setup will only change

if the user physically selects another setup from the list. Therefore, if you have

previously gone through this section and selected the appropriate setup, proceed to

the next section. Use the following steps to select your setup (transducer type):

Selecting a Setup for use with a specific Transducer Type

1) Press the MULTI MODE key once to activate the load setup list containing

the transducer types and settings.

2) Use the UP and DOWN arrow keys to scroll through the setup list until the

target setup is highlighted.

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PVX-B Precision Visual Thickness Gauge

3) Press the ENTER key to display the confirmation screen.

4) Press the OK key to select the setup and return to the measure screen, or

ESC to cancel the selecting a setup.

2.2 Calibration

The next step is to calibrate the PVX-B to the material and transducer being used. If

a sound velocity is not known, the PVX-B can be calibrated to a known thickness

sample. This demo will briefly explain each of possible calibration techniques. Read

through the various calibration techniques and select one of the following:

Known Velocity

If the material velocity is known, the user may wish to simply enter the velocity

number into the PVX-B, rather than have the PVX-B calculate the velocity value

using a know thickness. The steps for entering the velocity are outlined below:

Using a Known Material Velocity

1) Press the MENU key once to activate the menu items tab. Press the MENU

key multiple times to tab right and the ESC key multiple times to tab left until

the CAL menu is highlighted and displaying the submenu items.

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2) Use the UP and DOWN arrow keys to scroll through the sub menu items

until VELOCITY is highlighted.

3) Press the ENTER key to display the Digits Edit Box.

4) Press the UP and DOWN arrow keys to scroll the highlighted value.

5) Press the LEFT and RIGHT arrow keys to scroll the digit locations.

6) Repeat steps 4 & 5 until the velocity number is correctly displayed.

7) Press the OK key to set the velocity and return to the menu screen, or ESC

to cancel entering the velocity.

8) Finally, press the MEAS key to return to the measurement screen and begin

taking readings.

Known Thickness

Sometimes the sound velocity of a material is not known. In this case a sample with

a known thickness can be used to determine the sound velocity. It would be very

handy to carry a set of mechanical calipers to use in conjunction with the PVX-B for

calibration in the field:

Using a Known Thickness

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PVX-B Precision Visual Thickness Gauge

1) Physically measure an exact sample of the material or a location directly on

the material to be measured using a set of calipers or a digital micrometer.

2) Apply a drop of couplant on the transducer and place the transducer in

steady contact with the sample or actual test material. Be sure that the

reading is stable and the repeatability indicator, in the top left corner of the

display, is fully lit and stable. Press the MENU key once to activate the

menu items tab. Press the MENU key multiple times to tab right and the

ESC key multiple times to tab left until the CAL menu is highlighted and

displaying the submenu items.

3) Use the UP and DOWN arrow keys to scroll through the sub menu items

until ONE POINT is highlighted.

4) Press the ENTER key to display the Digits Edit Box.

5) Press the UP and DOWN arrow keys to scroll the highlighted value.

6) Press the LEFT and RIGHT arrow keys to scroll the digit locations.

7) Repeat steps 5 & 6 until the known thickness value is correctly displayed.

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8) Press the OK key to calculate the velocity and return to the menu screen, or

ESC to cancel entering the velocity.

9) Finally, press the MEAS key to return to the measurement screen and begin

taking readings.

Note: CHECK YOUR CALIBRATION! Place the transducer back on the

calibration point. The thickness reading should now match the known

thickness. If the thickness is not correct, repeat the steps above.

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Basic Material Type

If the material velocity is unknown, and a sample thickness cannot be taken from the

material, the user may opt to choose a basic material type from a list with

approximate velocity numbers. It’s important to note that these velocities will not

always be an exact representation of the material being tested. Use these values

only if a close approximation is acceptable. Follow the steps below to select a basic

material type:

Selecting a Basic Material Type

1) Press the MENU key once to activate the menu items tab. Press the MENU

key multiple times to tab right and the ESC key multiple times to tab left until

the CAL menu is highlighted and displaying the submenu items.

2) Use the UP and DOWN arrow keys to scroll through the sub menu items

until MATERIAL is highlighted.

3) Press the ENTER key to display the list of material types.

4) Press the UP and DOWN arrow keys to scroll through the material list until

the appropriate material is highlighted.

5) Press the ENTER key to display the confirmation screen.

6) Press the OK key to select the material and return to the menu screen, or

ESC to cancel the material selection.

7) Finally, press the MEAS key to return to the measurement screen and begin

taking readings.

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2.3 Measure

The PVX-B is now ready to measure. There are two different measurement view

options, each with a specific purpose. The steps below outline how to toggle

between the different view mode options:

Selecting the Measurement View Option

1) Press the MENU key once to activate the menu items tab. Press the MENU

key multiple times to tab right and the ESC key multiple times to tab left until

the DISP menu is highlighted and displaying the submenu items.

2) Use the UP and DOWN arrow keys to scroll through the sub menu items

until VIEW is highlighted.

3) Use the LEFT and RIGHT arrow keys to scroll the view options.

4) Once the view is displayed, press the MEAS key to return to measurement

mode.

DIGITS: Is a general digital view of the thickness value using a larger font size.

BSCAN: The Time Based B-Scan provides the user with a cross sectional view of

the material being tested. This mode is useful when there is concern regarding the

profile of the blind surface.

Once the view has been selected according to the application requirements, the

BSCAN START (B-ST) and BSCAN DEPTH (B-DEP) of the screen will potentially

need to be adjusted if the view has been set to BSCAN. Use the following steps to

adjust these settings directly from the measurement screen as follows:

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