CHAPTER THIRTEEN USI NG THE UTILITY SOFTWARE.............................122
APPENDIX A - VELOCITY TABLE ...................................................................124
APPENDIX A - SETUP LIBRARY.....................................................................126
CHAPTER ONE
INTRODUCTION
The Dakota Ultrasonics model CMXDL is an ultrasonic thickness gauge that
measures with extreme versatility. It has the ability to measure simultaneously
measure coatings and material thicknesses while maintaining the ability to locate pits,
flaws and defects in the material. Based on the same operating principles as
SONAR, the CMXDL is capable of measuring the thickness of various materials with
accuracy as high as ± 0.001 inches, or ± 0.01 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,
1500 Green Hills Road, #107
Scotts Valley, CA 95066 USA
• Telephone: (831) 431- 9722
• Facsimile: (831) 431-9723
• http://www.dakotaultrasonics.com
1.1 Disclaimer
Inherent in ultrasonic thickness measurement is the possibility that the instrument will
use the second rather than the first echo from the back surface of the material being
measured. This may result in a thickness reading that is TWICE what it should be.
Responsibility for proper use of the instrument and recognition of this phenomenon
rest solely with the user of the instrument. Other errors may occur from measuring
coated materials where the coating is insufficiently bonded to the material surface.
Irregular and inaccurate readings may result. Again, the user is responsible for
proper use and interpretation of the measurements acquired.
CHAPTER TWO
QUICK STARTUP GUIDE
Turn the CMXDL on and off using the switch located on the bottom right corner of the
keypad. When CMXDL is initially turned on, a flash logo and blinking lights will be
displayed, followed by attempting to identify the transducer(probe) currently plugged
into the gauge. The CMXDL is equipped with an “Auto Probe Recognition” feature
that attempts to identify special transducers with this built in feature. If the CMXDL
doesn’t find a transducer equipped with this feature, the user will be advanced to a
list of transducers requiring the u ser to select a specific transducer type. The
following sections outline each scenario. Note: This section is primarily written as a
basic startup guide only.
2.1 CMXDL Overview
In order to understand how to operate the CMXDL, it’s best to start off with an
understanding of what it is we’re looking at exactly. The CMXDL has a lot of great
features and tools that will prove to be a huge benefit for the variety of applications
you’re constantly facing on a continual basis. Let’s have a brief look at the screens
you’ll be looking at most often:
A. Repeatability/Stability Indicator – This indicator should be commonly used
in conjunction with the digital thickness values displayed. When all the vertical
bars are fully illuminated and the last digit on the digital thickness value is
stable, the CMXDL is reliably measuring the same value 3 to 200 times per
second, depending on which measurement mode and features are enabled.
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CMX DL High Performance Material & Coating Thickness Gauge
B. Battery Icon – Indicates the amount of battery life the CMXDL has remaining.
C. Velocity – The material velocity value the CMXDL is currently using or
calibrated for. Displayed in both English or Metric units, depending on the
what units the gauge is set for.
D. Feature Status Bar – Indicates the features currently enabled and in use in
the following order:
• Measurement Mode
• Differential Mode
• High Speed Scan Mode
• Alarm Mode
• Gain Setting
E. Digital Material Thickness Value – Extra large font size for viewing ease.
F. Scan Bar – Another view of material thickness in a deflection style horizontal
bar. This is a visual tool that would enable the user the ability to see thickness
changes during high speed scans from flaws and pits.
G. Units – The current measurement units being used (English, Metric).
H. Digital Material Thickness Value – Smaller font size when the B-Scan
display view is enabled.
I. Coating Thickness Value – Displays the actual thickness of any coating
adhered to a metallic material surface (PECT Mode), or a coating adhered to a
non-metallic surface (CT Mode).
J. Minimum Material Thickness – Part of the Al arm feature. Displays the
minimum thickness value found during a scan.
K. Maximum Material Thickness – Part of the Alarm feature. Displays the
maximum thickness value found during a scan.
L. B-Scan Display – Cross section view of the material. Provides the user with
graphical view of the opposite/blind surface (i.e. inside pipe wall surface), to
give the user some idea of the condition, or integrity of the material being
tested.
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2.2 Auto Probe Recognition
When the CMXDL is initially powered up, the gauge will automatically check to see if
the transducer plugged into the gauge can be recognized. The steps that follow
assume the CMXDL recognized the probe type:
Probe Automatically Recognized
1) Press the OK key once to use the identified probe, or ESC to display a list of
optional transducers. Note: if the CMXDL recognizes a specific transducer,
the user should always select OK to use the identified probe. The only time
an alternative probe should be selected from a list is if the user switched
probes following initial power up and recognition.
2) Assuming the CMXDL recognized the probe and the OK key was pressed,
the CMXDL will advance to a Zero Probe menu. If the transducer was
identified as a special transducer capable of measuring coating thickness, a
menu will be displayed allowing the user the ability to toggle the coating
thickness display on/off as follows:
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CMX DL High Performance Material & Coating Thickness Gauge
3) Press the UP and DOWN arrow keys to toggle the coating option on/off.
4) Wipe all couplant from the transducer face and advance to the Probe Zero
& Calibration section outlined below.
2.3 Selecting the Transducer Type
If the CMXDL does not identify a specific transducer type on initial power up, the user
will be required to select a type from a predefined list of types by diameter and
frequency. By selectin g a transducer type from a predefined list, the CMXDL can
recall specific properties about the transducer. Note: Once the transducer has been
selected, the CMXDL will store and recall this transducer type every time the CMXDL is
powered on/off. The type will only change if the user physically selects another
transducer type from the list, or selects a previously saved setup. However, the
CMXDL will continue to take you through these steps each time the gauge is powered
up. You’ll notice that the probe type previously selected will be highlighted every time
the probe type screen is displayed. Use the following steps to select your transducer
type:
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Selecting the Transducer Type
1) Press the OK or ESC keys to display the factory list of transducer types (by
diameter and frequency).
2) Press the UP and DOWN arrow keys to scroll through the transducer list
until the appropriate type is highlighted.
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CMX DL High Performance Material & Coating Thickness Gauge
3) Press the ENTER key to select the transducer type and display overwrite
existing probe screen.
4) Press the OK key to overwrite the existing probe type with the newly
selected probe type. The zero probe screen will be displayed. Proceed to
the zero probe section that follows.
2.4 Probe Zero & Calibration
The next steps are to perform a probe zero and calibrate the CMXDL to the material
and transducer being used. If the sound velocity is unknown, the CMXDL can be
calibrated to a known thickness sample. This demo will briefly explain both of these
techniques.
The CMXDL is equipped with two zero options:
1) Off Block Zero (Automatic Probe Zero) – When this feature is enabled the
CMXDL will do an electronic zero automatically, eliminating the need for a zero
disk or block.
2) On Block Zero (Manual Probe Zero) – When this feature is enabled the
transducer must be placed on the probe zero disk (battery cover located on the
top of the unit.
Note: Transducers of the same type will have very slight mechanical and electrical
variations. If it’s discovered that the linearity is off following an initial auto probe zero
and extreme accuracy is required, a manual zero should be performed followed by an
auto zero. This will adjust and eliminate any error. This is only required if it’s
discovered the transducer is non-linear following an initial auto probe zero.
The procedures are outl ined as follows:
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Performing an Auto Probe Zero (Off Block)
Coating Probe Identified Coating Probe Not Identified
1) Be sure all couplant has been removed from the face of the transducer.
2) Press the OK key to perform the automatic probe zero, or ESC key to
cancel the zero operation.
Coating Probe Identified Coating Probe Not Identified
3) The screens illustrated above will be briefly displayed followed by the main
measurement screen. The CMXDL is ready to be calibrated.
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CMX DL High Performance Material & Coating Thickness Gauge
Performing a Manual Probe Zero (On Block)
Note: When the zero probe option is set to manual, the probe zero disk
(battery cap) located on the top of the gauge, will be used as a zero standard
and the warning screen illustrated above will be displayed.
1) Press the OK or ESC keys to enter the main measurement screen and
begin the manual zero process.
2) Apply a drop of couplant on the transducer and place the transducer in
steady contact with the probe zero disk, and obtain a steady reading.
3) 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 PRB menu is highlighted and displaying the submenu items.
4) Press the UP and DOWN arrow keys to scroll through the sub menu items
until ZERO PROBE is highlighted.
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Coating Probe Identified Coating Probe Not Identified
5) Press the ENTER key to display the confirmation screen.
6) If a coating transducer was identified use the UP and DOWN arrow keys to
toggle coating on/off.
7) Press the OK key to complete the probe zero function, or ESC key to cancel
the probe zero function.
8) Remove the transducer from the probe zero disk, and proceed to the
calibration section.
Note: The value that is displayed will change depending on the current velocity
setting in the CMXDL. Disregard the number that is displayed. It is not important. What is important is accurately performing the steps outlined above
to insure reliability of the probe zero calculation.
One Point Material Calibration
For the purposes of this quick start section, we’ll only be covering the most common
one point calibration option to determine the sound velocity of the test material. It
would be very handy to carry a set of mechanical calipers to use in conjunction with
the CMXDL for calibration in the field:
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CMX DL High Performance Material & Coating Thickness Gauge
Using a Known Thickness
Note: Be sure that the probe zero procedure has been performed prior to
performing this calibration procedure.
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 MATL 1PT is highlighted.
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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.
8) Press the OK key to calculate the velocity and return to the menu screen, or
ESC to cancel the one point calibration.
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.
2.5 Zero Coating
In order to account for very slight electronic differences in transducers of the same
type, frequency, and diameter, the CMXDL has been equipped with a “zero coating”
feature. This enables the CMXDL to obtain very accurate readings on coatings,
eliminating potential errors incurred from slight differences in the manufacturing
processes. The procedure is outlined below:
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CMX DL High Performance Material & Coating Thickness Gauge
Performing a Coating Zero
1) Press the MULTI MODE key once to activate the measurement mode
options.
2) Use the UP and DOWN arrow keys to scroll through the sub menu items
until Coating Only (CT) mode is highlighted.
3) Press the ENTER key to select the measurement mode and return to the
measurement screen.
4) Apply a drop of couplant on the transducer and place the transducer in
steady contact with the probe zero disk (battery cover) and obtain a steady
reading.
Note: The coating measurement displayed will potentially be a value greater or
less than 0.
5) 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 PRB menu is highlighted and displaying the submenu items.
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6) Use the UP and DOWN arrow keys to scroll through the sub menu items
until ZERO COATING is highlighted.
7) Press the ENTER key to display the confirmation screen.
8) Press the OK key to zero the coating and return to the PRB menu, or ESC
to cancel the coating zero process.
9) Press the MULTI MODE key once to activate the measurement mode
options.
10) Use the UP and DOWN arrow keys to scroll through the sub menu items
until Coating On (PECT) is highlighted.
11) Press the ENTER key to select the measurement mode and return to the
measurement screen, and begin taking readings.
2.6 Coating Calibration
The CMXDL has been preset to a default coating velocity of 0.0850 in/µsec (2159
m/sec). This will be very close to the most common coating material velocities used
in the field. If the velocity of the coating is known, and different than the above
default setting, the user can simply enter the coating velocity into the CMXDL.
However, if the velocity is unknown, the CMXDL can also be calibrated to a specific
coating sample/type using the 1pt calibration option in PECT (pulse-echo coating)
mode, or a two point calibration is CT (coating only) mode. For the purpose of this
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CMX DL High Performance Material & Coating Thickness Gauge
quick start section only the 1pt option PECT (pulse-echo coating) mode will be
covered. Refer to the calibration section of the manual for a complete explanation on
the coating calibration options. The following steps below outline the necessary
steps to either set the velocity of the coating, or perform a one point calibration to
calculate the coating velocity:
Known Coating Velocity
If the coating velocity is known, the user may wish to simply enter the velocity
number into the CMXDL, rather than have the CMXDL calculate the velocity value
using a known thickness on a coating sample. The steps for entering the velocity are
outlined below:
Using a Known Coating Velocity
12) 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.
13) Use the UP and DOWN arrow key s to scroll through the sub menu items
until COATING VEL is highlighted.
14) Press the ENTER key to display the Digits Edit Box.
15) Press the UP and DOWN arrow keys to scroll the highlighted value.
16) Press the LEFT and RIGHT arrow keys to scroll the digit locations.
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17) Repeat steps 4 & 5 until the velocity number is correctly displayed.
18) Press the OK key to set the coating velocity and return to the menu screen,
or ESC to cancel entering the coating velocity.
19) Finally, press the MEAS key to return to the measurement screen and
begin taking readings.
Known Coating Thickness
When the exact velocity of a coating is unknown, the user has the option of
performing a one point calibration on a sample of the coating with a known thickness
to determine the sound velocity. It would be very handy to carry a set of mechanical
calipers to use in conjunction with the CMXDL for calibration in the field:
Using a Coating Sample to Calibrate
1) Physically measure a location on a coating sample using a set of calipers or
a digital micrometer.
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CMX DL High Performance Material & Coating Thickness Gauge
Important Note: In PECT (pulse-echo coating) mode, the coating sample must
be coupled to metal in order to calibrate successfully. Simply place a drop of
couplant on a piece of metal, lay the coating sample over the couplant on the
metal and proceed to step 2.
2) Apply a drop of couplant on the transducer and place the transducer in
steady contact with the coating (on metal) 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 COATING 1PT 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 coating velocity and return to the menu
screen, or ESC to cancel the one point calibration.
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 coating thickness reading should now match the known
coating thickness sample. If the thickness is not correct, repeat the steps
above.
2.7 Measure
The CMXDL is now ready to measure. There are two different measurement view
options, each with a specific purpose – Digits & B-Scan. 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.
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CMX DL High Performance Material & Coating Thickness Gauge
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: Displays the digital thickness value using a large font size. This view is
useful when the CMXDL is being used as a basic thickness gauge.
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. This can also be a useful view when scanning for pits and
flaws.
Once the view has been selected according to the application requirements, the B-START and B-DEPTH of the screen will potentially need to be adjusted if the view
has been set to BSCAN. Use the following steps to adjust these as follows:
Note: The B-Start and B-Depth are also used to adjust the parameters of Scan
Bar.
Adjusting B- START & B-DEPTH
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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 B-START or B-DEPTH is highlighted.
3) Use the LEFT or RIGHT arrow keys to increase/decrease the start or depth
values in coarse increments/decrements.
4) Repeat steps 2 & 3 until the range is correctly being displayed.
Alternatively, the B-START and B-DEPTH values can be changed using the Digit Edit Box as follows:
1) Use the UP and DOWN arrow keys to scroll through the sub menu items
until B-START or B-DEPTH is highlighted.
2) Press the ENTER key to display the digits edit box.
3) Press the UP and DOWN arrow keys to scroll the highlighted value.
4) Press the LEFT and RIGHT arrow keys to scroll the digit locations.
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CMX DL High Performance Material & Coating Thickness Gauge
5) Repeat steps 3 & 4 until the B-START or B-DEPTH value is correctly
displayed.
6) Press the OK key to set the B-START or B-DEPTH value and return to the DISP menu , or ESC to cancel entering the B-START or B-DEPTH value.
Note: the adjusted value will appear next to the B-START or B-DEPTH
menu labels.
7) Finally, press the MEAS key to return to the measurement screen and begin
taking readings.
DIGITS B-SCAN
In the upper left corner of each of the display photos above, is the repeatability
indicator. The repeatability indicator is represented by five vertical bars and
represents how repeatable the measurements are. In regular measurement mode,
the CMXDL makes 8 measurements a second. In scan mode, the CMXDL makes 200
measurements a second. If the coating mode option is activated, the CMXDL makes
3 measurements a second in regular measurement mode and 65 measurements a
second in scan mode. When the CMXDL is idle, only the left vertical bar will be
displayed. However, when the CMXDL is making a measurement, four or five of the
bars should be displayed on the repeatability indicator. If f ewer than four bars are
showing, the CMXDL is having difficulty achieving a stable measurement and the
thickness value displayed is potentially unstable.
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CHAPTER THREE
KEYBOARD, MENU, & CONNECTOR REFERENCE
3.1 Menu Key (Operation & Sub Menus)
The Menu key activates the primary menu structure containing 8 menu tab groups.
These tab groups then contain sub menu items, or functions. The sub menu items
have been organized in tab groups according to how closely they are related to the
individual tab group names. L et’s first get familiar with how to move around in these
tabs before continuing on to the sub menu functions. This procedure is outlined
below:
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CMX DL High Performance Material & Coating Thickness Gauge
Activating and Getting Around in the Menu Items
1) Press the MENU key once to activate the menu items tab. Pr ess the MENU
key multiple times to tab right, and the ESC key multiple times to tab left
until the desired tab group is highlighted and displaying the submenu items.
The tab groups are illustrated above (A).
Now that you’re familiar with activating and moving amongst the tab groups, let’s
have a look at how to move around in the sub menu items as follows:
Getting Around in the Sub Menu Items
1) Use the UP and DOWN arrow keys to scroll through the sub menu items
until the desired function is highlighted. The sub menu items are illustrated
in the diagram above (B).
2) Depending on which function is highlighted, use the LEFT, RIGHT, and Enter keys to scroll the options or activate the Digit Edit and List Box
options.
The sections to follow will provide the user with an explanation of the sub menu
functions:
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3.2 Probe – Menu
ZERO PROBE: The CMXDL is zeroed in much the same way that a mechanical
micrometer is zeroed. If the CMXDL is not zeroed correctly, all of the measurements
made using the CMXDL may be in error by some fixed value. The CMXDL is equipped
with an optional automatic or manual zero feature. Refer to the section on page 43,
for an explanation of this important procedure.
ZERO COATING: In order to account for very slight electronic differences in
transducers of the same type, frequency, and diameter, the CMXDL has been
equipped with a “zero coating” feature. This enables the CMXDL to obtain very
accurate readings on coatings, eliminating potential errors incurred from slight
differences in the manufacturing processes. Refer to the section on page 43, for a
detailed explanation.
TYPE: Enables the user to select the type of transducer being used from a chart of
transducer types. This provides increased linearity between transducers. Refer to
page 39 for a further explanation.
3.3 CAL – Menu
MAT: Select the material velocity from a chart of basic material types when a known
sample thickness, or material velocity cannot be obtained. Refer to page 52 for
further info.
MATL 1PT: Performs a single point calibration. This option allows the user to
automatically calculate the velocity by entering a known sample thickness. Refer to
page 49 for further info.
MATL 2PT: Performs a two-point calibration. This option allows the user to
automatically calculate the velocity by entering a second known sample thickness.
Refer to page 51 for further info.
VELOCITY: Function to calibrate the CMXDL by setting the velocity to a known
material velocity. Refer to page 46 for further info.
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CMX DL High Performance Material & Coating Thickness Gauge
COATING 1PT: Performs a single point coating calibrat ion. This option allows the
user to automatically calculate the velocity by measuring a known coating sample
thickness. Refer to page 77 for further info.
COATING 2PT: Performs a two-point coating calibration. This option allows the
user to automatically calculate the velocity by entering a second known coating
sample thickness. Refer to page 77 for further info.
COATING VEL: F unction to calibrate the CMXDL to a specific coating material type
by entering a coating velocity. Refer to page 15 or page 71 for further info.
3.4 DISP (display) – Menu
VIEW: Selectable BSCAN (cross section), and DIGITS (large digits) views. Refer to
page 56 for further info.
B-START: Provides the user the ability to change the start position of the B-SCAN
view. Refer to page 60 for further info.
B-DEPTH: Provides the user the ability to change the overall depth of the viewable
measurement area. It functions a lot like a zoom on a camera. Refer to page 62 for
further info.
UNITS: Toggle between English or Metric units. The readout will change from
inches to millimeters.
BACKLIGHT: Selectable OFF, ON, AUTO, or INVERT backlight option.
CONTRAST: Adjustable display contrast for variable light conditions.
3.5 TUNE – Menu
MEASURE MODE: Toggles a variety of unique measurement modes for different
application requirements. Refer to page 32 for further info.
GAIN: A 5 position gain switch in 2 db increments from 40 to 50 dB. Increase for
better penetration or punch, and decrease to eliminate unwanted noise or better
resolution. Refer to page 64 for further info.
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3.6 SETUP – Menu
OPEN: Displays a list of factory and user defined setups currently stored in memory.
These setups can be recalled and used at any time. Refer to page 112 for further
info.
SAVE: Provides the user with the ability to save a custom setup that has been
modified or created by the user. Refer to page 114 for further info.
DELETE: Provides the user with the ability to delete specific setups previously save
in memory. Refer to page 118 for further info.
DEFAULT SETUP : Loads a basic default setup. Use only as a last resort when the
setups in the CMXDL have been corrupted and a computer is not accessible. Refer to
page 119 for further info.
LANGUAGE: Provides the user the ability to select different languages for the
CMXDL. Refer to page 121 for further info.
3.7 DATA – Menu
NEW: Allows the user the ability to creat e a new alpha numeric grid, or sequential
log file with auto identifiers. Equipped with custom parameters, rows, and columns
depending on the users application reporting requirements. Refer to page 88 for
further info.
EDIT: Giv es the user the ability to change parameters of grid or sequential file
previously saved. Note: Pre-defined coordinates cannot be changed once they have
been created. Refer to page 105 for further info.
OPEN: This function provides the user with the ability to recall grids or sequential log
files that currently exist in memory, from a list of grids. Refer to page 108 for further
info.
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