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DAKOTA ULTRASONICS MiniMax v2.0, Operation Manual

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DAKOTA ULTRASONICS MiniMax v2.0 Operation Manual Download Page 5

11.3

 

P

ERFORMING A 

F

IELD 

C

ALIBRATION

 ................................................................................ 109

 

CHAPTER TWELVE MEASUREMENT & WAVEFORM DISPLAY ............... 123

 

12.1

 

Q

UANTITIES OF 

M

EASUREMENT

 ...................................................................................... 123

 

12.2

 

D

ISPLAY 

V

IEW 

O

PTIONS

 ................................................................................................. 124

 

12.3

 

A

DJUSTING THE 

D

ISPLAY

 ................................................................................................ 128

 

12.4

 

G

AIN

 .............................................................................................................................. 132

 

12.5

 

G

ATE

 ............................................................................................................................. 135

 

12.6

 

T

HRESHOLD

 ................................................................................................................... 138

 

12.7

 

I

NTERPRETING THE 

W

AVEFORM

 ...................................................................................... 141

 

12.8

 

M

ANUALLY 

L

OCATING THE 

E

CHO

 .................................................................................... 142

 

12.9

 

A

UTOMATIC 

E

CHO 

O

PTIMIZATION 

(A

UTO 

S

ET

) ................................................................. 144

 

12.10

 

U

NLOADED 

L

ENGTH AND 

E

LONGATION 

M

EASUREMENTS

 ................................................ 147

 

CHAPTER THIRTEEN ADDITIONAL FEATURES ........................................ 148

 

13.1

 

Q

UALITY

/C

ORRELATION 

(T

RANSDUCER 

P

LACEMENT

) ...................................................... 148

 

13.2

 

C

ONTRAST

 ..................................................................................................................... 148

 

13.3

 

B

ACKLIGHT

 .................................................................................................................... 149

 

13.4

 

G

RAPHICS 

O

PTIONS 

(

LOOK 

&

 FEEL

) ................................................................................ 150

 

13.5

 

P

ULSE

 ........................................................................................................................... 152

 

13.6

 

P

ULSER 

V

OLTAGE

 .......................................................................................................... 153

 

13.7

 

D

AMPING

 ....................................................................................................................... 154

 

13.8

 

D

IGITIZER

 ...................................................................................................................... 155

 

13.9

 

P

OLARITY

 ...................................................................................................................... 156

 

13.10

 

A

LARM 

M

ODE

 ............................................................................................................... 157

 

13.11

 

K

EY 

C

LICK

 ................................................................................................................... 160

 

13.12

 

D

ATE 

&

 

T

IME

 ................................................................................................................ 160

 

13.13

 

U

PGRADE 

G

AUGE

 ........................................................................................................ 162

 

13.14

 

F

REEZE 

&

 

C

APTURE

 ..................................................................................................... 163

 

CHAPTER FOURTEEN DATA STORAGE – SETUP, EDIT, & VIEW FILES 165

 

14.1

 

I

NTRODUCTION TO 

G

ROUP 

(

SPREADSHEET

)

 FORMAT

 ....................................................... 165

 

14.2

 

C

REATING A NEW 

G

ROUP

 ............................................................................................... 165

 

14.3

 

S

TORING A READING

 ....................................................................................................... 168

 

14.4

 

V

IEWING STORED READINGS

 ........................................................................................... 169

 

14.5

 

D

ELETING 

G

ROUPS 

(F

ILES

) ............................................................................................ 170

 

14.6

 

E

DITING A 

G

ROUP 

(F

ILE

) ................................................................................................ 173

 

14.7

 

C

HANGING THE ACTIVE 

F

ILE 

-

 

O

PEN

 ................................................................................ 175

 

14.8

 

C

LOSING AN ACTIVE 

F

ILE 

-

 

C

LOSE

 ................................................................................... 177

 

CHAPTER FIFTEEN SETUPS – CREATE, STORE, EDIT, & RECALL ....... 178

 

15.1

 

I

NTRODUCTION TO 

S

ETUPS

 ............................................................................................. 178

 

Summary of Contents for MiniMax v2.0

Page 1: ...OPERATION MANUAL DAKOTA ULTRASONICS MiniMax v2 0 Ultrasonic Bolt Tension Monitor P N P 156 0005 Rev 3 00 June 2019...

Page 2: ......

Page 3: ...A NEW GROUP TO STORE MEASUREMENTS 11 3 5 SETTING THE APPROXIMATE LENGTH 19 3 6 MEASURING REFERENCE LENGTHS 22 3 7 MEASURING ELONGATIONS 23 CHAPTER FOUR KEYBOARD MENU CONNECTOR REFERENCE 25 4 1 MENU KE...

Page 4: ...TER EIGHT MEASURING SYSTEM ZERO CALIBRATION 45 8 1 INTRODUCTION 45 8 2 CALIBRATION ZERO MISNOMER 45 8 3 CREATING A GROUP TO DOCUMENT ZERO CALIBRATION DATA 46 8 4 AUTO ZERO CALIBRATION 54 8 5 USING A S...

Page 5: ...13 2 CONTRAST 148 13 3 BACKLIGHT 149 13 4 GRAPHICS OPTIONS LOOK FEEL 150 13 5 PULSE 152 13 6 PULSER VOLTAGE 153 13 7 DAMPING 154 13 8 DIGITIZER 155 13 9 POLARITY 156 13 10 ALARM MODE 157 13 11 KEY CLI...

Page 6: ...UP 182 15 5 USING THE DEFAULT SETUP 184 15 6 SELECTING A LANGUAGE 185 CHAPTER SIXTEEN SOFTWARE FILE TRANSFER UPGRADES 187 16 1 COMPUTER SYSTEM REQUIREMENTS 187 16 2 INSTALLING DAKVIEW 187 16 3 COMMUNI...

Page 7: ...chanical methods and the MiniMax are complimentary and used in conjunction Dakota Ultrasonics maintains a customer support resource in order to assist users with questions or difficulties not covered...

Page 8: ...eath 1 3 Warranty The Dakota Ultrasonics MiniMax carries a two year limited warranty The warranty only applies to MiniMax units being operated as described in this manual Software and hardware failure...

Page 9: ...new user careful consideration of this entire manual is highly recommended 2 2 New to fastener measurement Assuming you are familiar with ultrasonics but unfamiliar with fastener measurement the chapt...

Page 10: ...our bolting applications Let s have a brief look at the screens you ll be looking at most often A Repeatability Stability Indicator Indicates the reliability of the measured bolt length When all the v...

Page 11: ...Markers Measurement scale of length K Units Displays the current measurement units being used English Metric L Gain The current gain setting can be adjusted at any time while in measurement mode M Te...

Page 12: ...y multiple times to tab left through the hot menu cells Refer to Chapter Four for additional definitions and information on the keypad and menu items Hot Menu Items Note Log and Temp are also listed i...

Page 13: ...x Bolt Tension Monitor 7 End DATA UTILS XFER NEW TEMP MODE UPGRADE GAUGE EDIT ALARM CAPTURE TO FILE OPEN ALARM LOW ABOUT CLOSE ALARM HIGH DELETE ONE FILE KEY CLICK DELETE ALL DATA SET DATE SHOW DATE S...

Page 14: ...nsducer and plug it into the MiniMax 3 If a temperature sensor is being used connect the sensor to the MiniMax 3 3 Setting up the MiniMax Please Read In this section the MiniMax will be setup in its s...

Page 15: ...tab right and the key multiple times to tab left until the SETUP menu is highlighted and displaying the submenu items 3 Use the and arrow keys multiple times to scroll through the sub menu items until...

Page 16: ...ITS is highlighted 3 Press the and arrow keys to scroll through the unit options IN inches IN HR inches hi resolution MM millimeters and MM HR millimeters hi resolution Note The high resolution option...

Page 17: ...to display the list material types 3 Press the and arrow keys multiple times to scroll through the material list until the appropriate type is highlighted 4 Press the key to display the confirmation...

Page 18: ...keys multiple times to scroll through the sub menu items until NEW is highlighted 3 Press the key to display the New Group Edit Box 4 Press the and arrow keys multiple times to scroll through the new...

Page 19: ...save the Group Name and return to the Group List Items menu or to cancel entering the Group Name Creating a Group Note 1 Press the and arrow keys multiple times to scroll through the new Group List It...

Page 20: ...menu or to cancel entering the Group Note Selecting the Number of Bolts in the Group Note A group can contain up to 250 bolts There must be at least 1 bolt in a group 1 Press the and arrow keys multip...

Page 21: ...d 7 Press the key to display the Digits Edit Box and re enter the NUM BOLTS 8 Press the key to save the NUM BOLTS and return to the Group List Items menu or to cancel entering the NUM BOLTS Selecting...

Page 22: ...displayed 7 Press the key to display the Digits Edit Box and re enter the NUM READS 8 Press the key to save the NUM READS and return to the Group List Items menu or to cancel entering the NUM READS I...

Page 23: ...eat steps 3 4 until the START BOLT NUM value is correctly displayed 6 Press the key to save the START BOLT NUM and return to the Group List Items menu or to cancel entering the START BOLT NUM Note If...

Page 24: ...keys multiple times to scroll through the new Group List Items until INCR DIR is highlighted 2 Press the and arrow keys multiple times to toggle the Increment direction NONE NORTH EAST SOUTH or WEST 3...

Page 25: ...e lengths 3 5 Setting the Approximate Length In order to utilize the AUTO SET feature of the MiniMax when measuring reference lengths the MiniMax has to know where to start looking for the detection W...

Page 26: ...to scroll the highlighted value 4 Press the and arrow keys multiple times to scroll the digit locations 5 Repeat steps 3 4 until the ALEN value is correctly displayed 6 Press the key to return to the...

Page 27: ...u items until APPROX LEN is highlighted 3 Press the key to display the Digits Edit Box 4 Press the and arrow keys multiple times to scroll the highlighted value 5 Press the and arrow keys multiple tim...

Page 28: ...target cell cursor to the desired storage location Note The approximate lengths must always be located in the first column A for all bolts in the group 4 Place a small amount of couplant on the trans...

Page 29: ...ime by pressing the key 3 7 Measuring Elongations Now that the reference lengths have been measured and saved we re ready to start measuring elongation values We ll start off by assuming the bolt has...

Page 30: ...is only used when measuring reference lengths If the key is accidentally pressed press it again to turn the high speed mode off 2 Press the key to save the current elongation in the highlighted cell...

Page 31: ...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 na...

Page 32: ...gst 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 and arrow keys to scroll through the sub menu items until the...

Page 33: ...een selected above this function displays and calculates the actual measurement screen containing the known physical length velocity and temperature coefficient of the calibration standard versus the...

Page 34: ...a by the user if necessary STRESS FACTOR This feature allows the user to edit the stress factor at anytime Once a material type is selected the stress factor of the selected material type is stored in...

Page 35: ...the area at anytime Refer to page 106 for further info EFFECTIVE LENGTH The length of the region of the fastener under stress the distance between the nut plus some amount of additional stress that o...

Page 36: ...pulser option selected The standard setting is 150 volts This enables the MiniMax to offer greater penetration for difficult material types or increased resolution on noisy materials Refer to page 153...

Page 37: ...OLD1 Enables the user to set the sensitivity level of Gate1 The amplitude of the signal must reach or exceed the threshold level before a measurement is detected Refer to page 135 for further info 4 8...

Page 38: ...essible Refer to page 184 for further info LANGUAGE Provides the user the ability to select different languages for the MiniMax Refer to page 185 for further info 4 10 DATA Menu NEW Allows the user th...

Page 39: ...its purchased with the automatic temperature compensation option and probe Note Contact Dakota for information on upgrading the MiniMax Refer to page 91 for further info ALARM Toggles alarm mode on of...

Page 40: ...mary functions of the CLR key are to clear a measurement from a grid or sequential log files cell location or set an obstruct backspace in an Alpha Edit Box If a user has already saved a measurement a...

Page 41: ...on keys 4 18 ENTER key The ENTER key is used in the overall menu selection process to activate list and edit boxes display and save measurements to a group file location 4 19 AUTO SET Key The AUTO SET...

Page 42: ...Press the key once to display the measure screen and multiple times to advance the cursor to the next cell right or to advance to the next cell left until the desired function is highlighted 2 Press...

Page 43: ...d on the back label of the MiniMax Note Rechargeable batteries can be used however they must be recharged outside of the unit in a stand alone battery charger USB Type B Connector Refer to Diagram The...

Page 44: ...Send a pulse of energy toward an object in this case the opposite or reflecting end of the fastener and then measure the time between the initial pulse and the returning echo While the concept is com...

Page 45: ...5 MHz pulse Therefore a lower frequency transducer is able to achieve an echo in a longer bolt or in a bolt made of metal with higher resistance to sound transmission attenuation While the lower frequ...

Page 46: ...ducer and the end of the bolt will prevent the sonic energy from crossing The gap must be filled with a suitable coupling fluid Normally a liquid ultrasonic couplant is applied between the transducer...

Page 47: ...l be transmitted toward the side wall and reflect along the bolt yielding poor signal quality and possible measurement errors Avoid alignment errors exceeding 2 degrees Figure 2 Rough and angled trans...

Page 48: ...cause significant errors Avoid Rough reflecting bolt ends As shown in Figure 4 if the reflecting end of the bolt is rough or curved most of the reflected energy will be dispersed and a weak or distor...

Page 49: ...MiniMax Bolt Tension Monitor 43 Figure 6 Reflection in a bending bolt...

Page 50: ...cting the proper frequency the following items should be taken into consideration Higher frequencies are typically a better choice when measuring smaller diameter bolts as the sound is better focused...

Page 51: ...em Since every zeroed MiniMax makes the same time measurement the systems give the same result and are interchangeable System Zeroing is only required if More than one MiniMax or transducer will be us...

Page 52: ...d conditions of the application itself 8 3 Creating a Group to Document Zero Calibration data The first step is to setup a group to document our probe zero data By doing this all the values and settin...

Page 53: ...Items until NAME is highlighted 5 Press the key to activate the Alpha Edit Box 6 Press the arrow keys to highlight the appropriate alpha characters 7 Press the key to select a character and advance to...

Page 54: ...l through the new Group List Items until NOTE is highlighted 2 Press the key to activate the Alpha Edit Box 3 Press the arrow keys to highlight the appropriate alpha characters 4 Press the key to sele...

Page 55: ...olt is used the group will contain 1 bolt If the 3 6 cal bars are being used then the group should contain 2 bolts If the triple sided glass block is being used then the group should contain 3 bolts 1...

Page 56: ...gs Per Bolt Note A bolt can have up to 51 possible measurements and 1 initial length L REF There must be at least one reading per bolt Since this group is being created to store Zero Cal Data and veri...

Page 57: ...splay the Digits Edit Box and re enter the NUM READS 8 Press the key to save the NUM READS and return to the Group List Items menu or to cancel entering the NUM READS If there s not enough memory avai...

Page 58: ...eys multiple times to scroll the digit locations 5 Repeat steps 3 4 until the START BOLT NUM value is correctly displayed 6 Press the key to save the START BOLT NUM and return to the Group List Items...

Page 59: ...keys to scroll through the new Group List Items until INCR DIR is highlighted 2 Use the and arrow keys to toggle the Increment direction NONE NORTH EAST SOUTH or WEST 3 When the correct Increment dir...

Page 60: ...ignal quality and calibration standard used may not always work If valid signals cannot be acquired during the auto set routine the MiniMax will report Can t find stable echo Before eliminating this o...

Page 61: ...menu items until ZERO MODE is highlighted 3 Press the and arrow keys multiple times to scroll the zero mode options until the AUTO option is displayed Note The auto option will perform a two point zer...

Page 62: ...arrow keys multiple times to scroll the highlighted value 9 Press the and arrow keys multiple times to scroll the digit locations 10 Repeat steps 8 9 until the PHY LENGTH value is correctly displayed...

Page 63: ...c for the 3 6 bars supplied by Dakota Ultrasonics If the glass block is used it should be set to 0 The reason for this is because glass has a very low temperature coefficient 18 Press the and arrow ke...

Page 64: ...and display the new velocity and zero values or to cancel the calibration Note If was pressed to calculate the new values pressing the key once will display the CAL menu to review the new ZERO value...

Page 65: ...eys multiple times to scroll the highlighted value 29 Press the and arrow keys multiple times to scroll the digit locations 30 Repeat steps 21 22 until the VELOCITY value is correctly displayed 31 Pre...

Page 66: ...with both ends ground and polished can make a simple and effective calibration standard The primary objective is to verify a zero value prior to measuring to avoid measurement errors if the MiniMax tr...

Page 67: ...til TYPE is highlighted 3 Press the key to display the list of material types 4 Press the and arrow keys multiple times to scroll through the material list until the appropriate material is highlighte...

Page 68: ...rough the sub menu items until ZERO MODE is highlighted 3 Press the and arrow keys multiple times to scroll the zero mode options until the FIXED option is displayed Note Each time the arrow keys are...

Page 69: ...es until the appropriate bolt type is highlighted 8 Press the key to display the confirmation screen 9 Press the key to select the bolt type and return to the menu screen or press to cancel the bolt t...

Page 70: ...ptions until the ELONG option is displayed 14 Press the key multiple times to tab right and the key multiple times to tab left until the AUTO menu is highlighted and displaying the submenu items 15 Pr...

Page 71: ...ghted Note Both the Approximate Length and Auto Set feature could have also been set and activated using the Hot Menu Items and key as well However since we are already in the Tab Menu Items it was ju...

Page 72: ...a for the probe zero bolt we need to document it as outlined in the next section Storing the Reference Length 1 Press the key once to activate measure menu items Press the key multiple times to move r...

Page 73: ...o calibration bolt In this case calculating the probe zero value forces the new hardware to match with the original If the hardware has not changed the user should not use this feature If the hardware...

Page 74: ...sed a confirmation screen will appear to warn the user that the zero mode is being changed Press the OK key to advance to the next mode option 4 Press the and arrow keys multiple times to scroll throu...

Page 75: ...row keys multiple times to scroll the digit locations 10 Repeat steps 8 9 until the PHY LEN 1 value is correctly displayed 11 Press the key to return to the One Point Zero List or to cancel entering t...

Page 76: ...the and arrow keys multiple times to scroll through the One Point Zero List Items until TEMP COEF is highlighted 19 Press the key to display the Digits Edit Box Note Enter the temperature coefficient...

Page 77: ...TRASONIC 1 is highlighted 25 Press the key to display the measurement screen 26 Press the key to automatically adjust the settings and measure the calibration standard 27 Press the and arrow keys mult...

Page 78: ...d it s because the temperature of the bolt has changed In this case the zero value should not be changed but the temperature value should be Therefore the bolt becomes sort of a temperature sensor in...

Page 79: ...ey to display the Group View Box 3 Press the arrow keys to scroll the stored readings and corresponding display view Notice as the cursor is moved to a different cell the display will be updated with...

Page 80: ...to national standards The primary advantage of using these bars block versus setting a standard bolt aside as explained in the previous section is the possibility of losing the stand alone bolt Becaus...

Page 81: ...rometer or other method will be used the temperature mode should be set to manual and the temperature manually entered into the gauge 1 With the menu items still active from the previous section press...

Page 82: ...ase of a one point calibration 4 Press the and arrow keys multiple times to scroll through the sub menu items until MEASURE ZERO is highlighted 5 Press the key to display the Two Point Zero list box 6...

Page 83: ...to the Two Point Zero list or to cancel entering the PHY LEN 1 12 Press the and arrow keys multiple to scroll through the Two Point Zero list until PHY LEN 2 is highlighted Note PHY LEN 2 is the actua...

Page 84: ...is a velocity for each cal bar use the velocity of the longest cal bar as it will be most significant 6 bar If the glass block is being used it will have only one velocity specified for the block 19...

Page 85: ...and arrow keys multiple times to scroll the highlighted value 27 Press the and arrow keys multiple times to scroll the digit locations 28 Repeat steps 26 27 until the TEMP COEF value is correctly disp...

Page 86: ...e correct measurement value during calibration the material velocity and temperature coefficient must be set to the same values as in the calibration section and the stress factor set to 1 000 34 Pres...

Page 87: ...ration unless the transducer transducer cable or instrument has been changed In any event the probe zero calibration should always be checked prior to changing it and only changed if it s required If...

Page 88: ...This will set the quantity display in terms of elongation Note In order to record the data for both the 3 6 1 3 glass block the CAL DATA group created in an earlier section must be opened 4 Press the...

Page 89: ...he log followed by pressing the to confirm load from memory or to cancel opening the log file 9 Press the key multiple times to tab right and the key multiple times to tab left until the CAL menu is h...

Page 90: ...GAIN as well as the POLARITY may need to be adjusted Using a large diameter transducer can produce an extremely strong signal and often the gain can be turned down to allow the user to see the peaks...

Page 91: ...ept the calibration and return to the Two Point Zero list or to cancel the calibration 24 Press the and arrow keys multiple times to scroll through the Two Point Zero list until CALC ZERO is highlight...

Page 92: ...the CAL DATA group Note Since the last data point taken was ULTRASONIC 2 or the 6 cal bar press the arrow keys multiple times to highlight A2 for the first reading of the 6 cal bar 36 Press the key to...

Page 93: ...s to move right and the key multiple times to move left until the LOG cell is highlighted to display the CAL DATA group 41 Press the key to display the CAL DATA group 42 Press the arrow keys multiple...

Page 94: ...d redo the zero cal procedure in its entirety The next section outlines the verification procedures Verifying the Probe Zero at a Later Time 1 Press the key once to activate the menu items tab Press t...

Page 95: ...ransducer and attach it to one end of the cal standard Rotate the transducer clockwise and counter clockwise applying a small amount of pressure to eliminate any excess couplant between the transducer...

Page 96: ...all the columns B ZZ for each individual bolt Therefore no adjustments to the MiniMax should be necessary 10 If the elongation is 0005 and In Spec Press the key to save the current reading in the hig...

Page 97: ...The thermal expansion of the fastener and the ultrasonic change in velocity as a result of temperature are two separate effects However for the purpose of the MiniMax they are combined in a single fa...

Page 98: ...o scroll the highlighted value 6 Alternatively press the key to display the Digits Edit Box 7 Press the and arrow keys multiple times to scroll the highlighted value 8 Press the and arrow keys multipl...

Page 99: ...menu is highlighted and displaying the submenu items 2 Press the and arrow keys multiple times to scroll through the sub menu items until TEMP MODE is highlighted 3 Press the and arrow keys multiple t...

Page 100: ...t or fastener and not accidentally removed or misplaced during the measurement process Selecting Automatic Temperature Mode 1 Press the key once to activate the menu items tab Press the key multiple t...

Page 101: ...material the result will always be an average value of that sample 10 2 Velocity Calibration A velocity calibration is generally performed by adjusting the velocity in the MiniMax to the point where t...

Page 102: ...to display the list of bolt material types 7 Press the and arrow keys multiple times to scroll through the material list until the appropriate material type is highlighted Note If the material type i...

Page 103: ...Press the key to display the Digits Edit Box 13 Press the and arrow keys multiple times to scroll the highlighted value 14 Press the and arrow keys multiple times to scroll the digit locations 15 Rep...

Page 104: ...tion This will help to eliminate any potential measurement errors caused by changing the sound path 19 Press the key and the Ultrasonic Length of the bolt will be displayed Note Alternatively the key...

Page 105: ...to set the Velocity and return to the menu screen or to cancel entering the Velocity 28 Finally press the key to return to the measurement screen The ultrasonic length displayed should now match the...

Page 106: ...ical or electronic height gages Averaged values of length measurement with mechanical and electric micrometers A Dakota Ultrasonics MiniMax Ultrasonic Bolt Tension Monitor A minimum of three sample bo...

Page 107: ...the bolt Rotate the transducer clockwise and counter clockwise applying a small amount of pressure to eliminate any excess couplant between the transducer and bolt Be sure to always place the transdu...

Page 108: ...y a drop of couplant to the bolt or transducer and attach it to one end of the bolt Rotate the transducer clockwise and counter clockwise applying a small amount of pressure to eliminate any excess co...

Page 109: ...ure range only The primary thing to consider is to use a respectable temperature range with at least 5 different temperature points The following procedure outlines the process for experimental determ...

Page 110: ...mperature Factor L0 Ultrasonic Length at Beginning Temperature T0 LT Ultrasonic Length at Ending Temperature T T0 Beginning Temperature T Ending Temperature Calibrating the Temperature Factor 1 Stabil...

Page 111: ...at the target temperatures T1 through T5 48 68 88 and 108 0 F other similar range with 5 temperatures measuring the ultrasonic lengths L1 through L5 respectively This process must be done for each of...

Page 112: ...between load and elongation is a function of the elasticity of the bolt material and the geometry of the bolt in the application being measured Hooke s Law expresses this relationship E L AE l P Hooke...

Page 113: ...of Elasticity of the Bolt Material From Manufacturer The effective length is the average length of the fastener under stress when a load is applied For an applied constant load the elongation of a fas...

Page 114: ...erial constants are unknown or cannot be calibrated in a laboratory environment In cases such as these a field calibration is the most accurate means of calibration A field calibration is accomplished...

Page 115: ...ich method is most suitable for the application and producing the best results 11 3 Performing a Field Calibration This section outlines the necessary procedures to perform a field calibration to dete...

Page 116: ...tiple times to tab left until the DATA menu is highlighted and displaying the submenu items 2 Press the and arrow keys multiple times to scroll through the sub menu items until NEW is highlighted 3 Pr...

Page 117: ...o the next field of the Group Name 8 Use the key to backspace if necessary 9 Repeat steps 6 8 until the Group Name is completed 10 Press the key to save the Group Name and return to the Group List Ite...

Page 118: ...riate alpha characters 4 Press the key to select a character and advance to the next field of the Group Note 5 Use the key to backspace if necessary 6 Repeat steps 3 5 until the Group Note is complete...

Page 119: ...ow keys multiple times to scroll the highlighted value 4 Press the and arrow keys multiple times to scroll the digit locations 5 Repeat steps 3 4 until the NUM BOLTS value is correctly displayed 6 Pre...

Page 120: ...value is correctly displayed 6 Press the key to save the NUM READS and return to the Group List Items menu or to cancel entering the NUM READS 7 Press the key to display the Digits Edit Box and re ent...

Page 121: ...ltiple times to scroll through the new Group List Items until START BOLT NUM is highlighted 2 Press the key to display the Digits Edit Box 3 Press the and arrow keys multiple times to scroll the highl...

Page 122: ...s menu or to cancel entering the START BOLT NUM Selecting the Auto Increment Direction The Auto Increment feature gives the user the ability to specify which direction to advance the cursor after stor...

Page 123: ...UP is highlighted 2 Press the key to accept the group parameters and activate the confirmation screen 3 Press the key to save the New Group or the key to cancel the New Group setup and return to the D...

Page 124: ...highlighted 2 Press the key to display the Group View Box 3 Press the arrow keys to scroll the target cell cursor to the desired storage location Note The first column must be used to store reference...

Page 125: ...steps assume that the user has previously selected a similar material type for the list of materials and the approximate length of the bolt has been entered Therefore the MiniMax is currently setup a...

Page 126: ...Known Load value is correctly displayed 9 Press the key to store the Known Load and return to the measurement screen or to cancel entering the Known Load 10 Increase the applied load to approximately...

Page 127: ...le times to scroll the highlighted value 19 Press the and arrow keys multiple times to scroll the digit locations 20 Repeat steps 18 19 until the Known Load value is correctly displayed 21 Press the k...

Page 128: ...reen Note The regression or vector coefficient will be displayed The closer this number is to 1 the better the fit or least amount of error 4 Press the key to accept the calculation or the key to canc...

Page 129: ...is required as the measurement is simply a difference equation The stress factor and velocity will typically not vary more than 5 in total over the entire range of possible steel fasteners Therefore t...

Page 130: ...specific detection point The RF waveform view is recommended when initially setting up the MiniMax for an application The user can consider either a full RF wave or split screen RF option This displa...

Page 131: ...right and the key multiple times to tab left until the DISP menu is highlighted and displaying the submenu items 2 Press the and arrow keys multiple times to scroll through the sub menu items until VI...

Page 132: ...For both RF and Rectified views it s important to note that a measurement must fall inside the displays viewable range in order to see the waveform However even if the waveform is outside of the view...

Page 133: ...n Markers Measurement scale of length K Units Displays the current measurement units being used English Metric L Gain The current gain setting can be adjusted at any time while in measurement mode M T...

Page 134: ...o move right and the key multiple times to move left until the WIDTH cell is highlighted 2 Press the and arrow keys multiple times to scroll the highlighted value 3 Alternatively press the key to disp...

Page 135: ...TH is highlighted 3 Press the and arrow keys multiple times to scroll the value When the correct width is being displayed proceed to step 8 4 Alternatively press the key to display the Digits Edit Box...

Page 136: ...LAY cell is highlighted 2 Press the and arrow keys multiple times to scroll the highlighted value 3 Alternatively press the key to display the Digits Edit Box 4 Press the and arrow keys multiple times...

Page 137: ...ess the and arrow keys multiple times to scroll the value When the correct Delay is being displayed proceed to step 8 4 Alternatively press the key to display the Digits Edit Box 5 Press the and arrow...

Page 138: ...m If you turn it up too much you can t hear the music clearly If it s turned down too much you can t hear it at all The procedures to adjust the Gain are outlined below Adjusting the Gain using the Ho...

Page 139: ...ess the key once to activate the menu items tab Press the key multiple times to tab right and the key multiple times to tab left until the TUNE menu is highlighted and displaying the submenu items 2 P...

Page 140: ...urn to the measurement screen and begin taking readings The step size of the gain increment can also be adjusted by the user The procedure to set a specific gain increment amount is outlined below Adj...

Page 141: ...el entering the Step Size 9 Finally press the key to return to the measurement screen and begin taking readings 12 5 Gate The MiniMax is equipped with a single gate typically used to block or eliminat...

Page 142: ...ine at the top of D represents the GATE The starting point of GATE has been adjusted just beyond the noise A so that the MiniMax ignores the noise and detects on the true back wall reflection C Altern...

Page 143: ...the and arrow keys multiple times to scroll the highlighted value 5 Press the and arrow keys multiple times to scroll the digit locations 6 Repeat steps 4 5 until the GATE value is correctly displaye...

Page 144: ...correctly displayed 8 Press the key to set the Gate value and return to the menu screen or to cancel entering the Gate value 9 Finally press the key to return to the measurement screen and begin takin...

Page 145: ...ly press the key to display the Digits Edit Box 4 Press the and arrow keys multiple times to scroll the highlighted value 5 Press the and arrow keys multiple times to scroll the digit locations 6 Repe...

Page 146: ...ultiple times to scroll the value When the correct threshold is being displayed proceed to step 8 4 Alternatively press the key to display the Digits Edit Box 5 Press the and arrow keys multiple times...

Page 147: ...k Jump to another cycle later in time with greater amplitude Often times transducers have a very slow ramp up time until reaching maximum energy In other words the amplitude of the first cycle is lowe...

Page 148: ...you re able to notice the peak jump during the process of loading increasing the gain or lowering the threshold will generally correct the error However if it goes unnoticed all your measurements wil...

Page 149: ...ed value 5 Press the and arrow keys multiple times to scroll the digit locations 6 Repeat steps 4 5 until the DELAY value is correctly displayed 7 Press the key to return to the measurement screen or...

Page 150: ...timization The Auto Set uses a variety of algorithms evaluating the positive and negative and negative cycles and selects the best phase polarity to use for measurement It also optimizes the gain sets...

Page 151: ...eps 3 4 until the ALEN value is correctly displayed 6 Press the key to return to the measurement screen or to cancel entering the ALEN The user can also access and set the approximate length from the...

Page 152: ...lighted value 5 Press the and arrow keys multiple times to scroll the digit locations 6 Repeat steps 4 5 until the Approx Len value is correctly displayed 7 Press the key to set the Approx Len and ret...

Page 153: ...counter clockwise applying a small amount of pressure to eliminate any excess couplant between the transducer and bolt surface Be sure to always place the transducer in the same location This will he...

Page 154: ...uring the initial length measurement Rotate the transducer clockwise and counter clockwise making small movements of the transducer position until the active wave matches the symmetry of original wave...

Page 155: ...d arrow keys multiple times to scroll through the sub menu items until CONTRAST is highlighted 3 Press the and arrow keys multiple times to scroll the CONTRAST value 4 Finally press the key to return...

Page 156: ...rrow keys multiple times to scroll the BACKLIGHT options 4 Finally press the key to return to the measurement screen and begin taking readings 13 4 Graphics Options look feel The MiniMax has a few gra...

Page 157: ...MiniMax Bolt Tension Monitor 151 Filled Draws a filled version of the waveform Detect Mark The detect mark is another look and feel option for displaying the detection indicator...

Page 158: ...There are three pulse width options SPIKE THIN and WIDE with adjustable pulser voltages of 100 150 and 200 volts Longer bolts with attenuative material may be optimized best using the 200 volt settin...

Page 159: ...the Pulse options 4 Once the Pulse is displayed press the key to return to the measurement screen 13 6 Pulser Voltage The MiniMax has a 200 volt square wave pulser that can be adjusted for specific bo...

Page 160: ...rrow keys multiple times to scroll the Pulser Voltage options 4 Once the desired Pulser Voltage is displayed press the key to return to the measurement screen 13 7 Damping The MiniMax has a built in d...

Page 161: ...8 Digitizer The digitizer feature provides additional stability to the measurement by increasing the number of samples This can be beneficial when measuring shorter length fasteners with units set to...

Page 162: ...ER options 4 Once the desired DIGITIZER setting is displayed press the key to return to the measurement screen 13 9 Polarity Refer to section 12 7 interpreting the Waveform for a detailed explanation...

Page 163: ...ple times to scroll through the sub menu items until POLARITY is highlighted 3 Use the and arrow keys multiple times to toggle the POLARITY negative or positive 4 Press the key to return to the measur...

Page 164: ...Toggle Alarm on off 1 Press the key once to activate the menu items tab Press the key multiple times to tab right and the key multiple times to tab left until the UTIL menu is highlighted and displayi...

Page 165: ...s Edit Box 3 Press the and arrow keys multiple times to scroll the highlighted value 4 Press the and arrow keys multiple times to scroll the digit locations 5 Repeat steps 3 4 until the ALARM LOW valu...

Page 166: ...le times to tab left until the UTIL menu is highlighted and displaying the submenu items 2 Use the and arrow keys multiple times to scroll through the sub menu items until KEY CLICK is highlighted 3 U...

Page 167: ...the and arrow keys multiple times to scroll through the sub menu items until SET DATE is highlighted 3 Press the key to display the Digits Edit Box 4 Press the and arrow keys multiple times to scroll...

Page 168: ...to your desktop and copied into the MiniMax file folder the procedure to upgrade is outlined below Note The firmware file extension is bch and there can only be one bch file in the MiniMax folder Sim...

Page 169: ...displayed on the screen and save it to a file Each snapshot can be individually named and stored as a tif tagged image file This can be opened using any graphics viewer With the storage capacity of t...

Page 170: ...en 5 To capture a file press the key to display the list box 6 Use the and arrow keys to scroll through the list items until CAPTURE TO FILE is highlighted 7 Press the key to activate the Alpha Edit B...

Page 171: ...considering there is a 4 GB internal SD card on the board Each measurement stored can be considered a page of data as it stores the measurement snapshot of the waveform and all the settings of the Min...

Page 172: ...he key multiple times to tab right and the key multiple times to tab left until the DATA menu is highlighted and displaying the submenu items 2 Use the and arrow keys multiple times to scroll through...

Page 173: ...t a character and advance to the next field Note Use the key to backspace if necessary 8 Repeat steps 6 7 until the NAME NOTE NUM BOLTS NUM READS START BOLT or INCR DIR is completed 9 Press the key to...

Page 174: ...rocedures outline this process Storing a Reading Note Once the group has been created it will automatically be displayed as a grid following the create confirmation screen It is located at the bottom...

Page 175: ...The Group Log can be hidden at any time by pressing the key However in order to display it again the hot menu item LOG must be highlighted When LOG is highlighted press the key to display the group No...

Page 176: ...ice as the cursor is moved to a different cell the display will be updated with the display view saved with the reading Readings stored in memory are indicated by displaying a MEM in the top left corn...

Page 177: ...he key multiple times to tab left until the DATA menu is highlighted and displaying the submenu items 2 Use the and arrow keys to scroll through the sub menu items until DELETE ONE FILE is highlighted...

Page 178: ...ight and the key multiple times to tab left until the DATA menu is highlighted and displaying the submenu items 2 Use the and arrow keys to scroll through the sub menu items until DELETE ALL DATA is h...

Page 179: ...e times to tab right and the key multiple times to tab left until the DATA menu is highlighted and displaying the submenu items 2 Use the and arrow keys to scroll through the sub menu items until EDIT...

Page 180: ...to highlight the appropriate alpha characters 7 Press the key to select a character and advance to the next field of the Comments 8 Use the key to backspace if necessary 9 Repeat steps 6 8 until the C...

Page 181: ...r time The name of the currently active file is always displayed at the top of the Grid Seq Box in measurement mode refer to photo below It s not only important to recognize what file is currently act...

Page 182: ...menu items until OPEN is highlighted 3 Press the key to display the Grid Seq List Box 4 Use the and arrow keys to scroll through the grids until the target grid is highlighted 5 Press the key to acti...

Page 183: ...en or active file Closing an Active File 1 Press the key once to activate the menu items tab Press the key multiple times to tab right and the key multiple times to tab left until the DATA menu is hig...

Page 184: ...needed The user can create as many setup files containing 64 setups per file as is needed 15 2 Opening a Setup Once the MiniMax has been loaded with a number of previously saved setup files for differ...

Page 185: ...Once the MiniMax parameters and features have be adjusted for an application the user may elect to save these setting to a specific setup location for future use This can potentially save time and red...

Page 186: ...e the menu items tab Press the key multiple times to tab right and the key multiple times to tab left until the SETUP menu is highlighted and displaying the submenu items 2 Use the and arrow keys to s...

Page 187: ...characters the key to select characters and the key to backspace through the characters until the Name or Note fields have been edited 7 Press the key to return to the Save Setup Parameters List Box...

Page 188: ...14 Finally press the key to return to the measurement screen Note The Name and Comments of the Setup can be edited at any time by simply repeating the Save Setup routine described above Therefore the...

Page 189: ...e times to tab left until the SETUP menu is highlighted and displaying the submenu items 2 Use the and arrow keys to scroll through the sub menu items until DELETE is highlighted 3 Press the key to di...

Page 190: ...only time this might possibly occur is if the setup file in the MiniMax was somehow corrupted and the user does not have access to a computer to re load the factory setups back into the MiniMax This g...

Page 191: ...supported However be sure to update your gauge firmware often to check for language additions The steps to select a language are outlined as follows Selecting a Language 1 Press the key once to activa...

Page 192: ...Dakota Ultrasonics 186 4 Once the desired language is displayed press the key to return to the measure screen...

Page 193: ...niMax series gauges The MiniMax is equipped with USB acting as a Thumb Drive external storage device when connected to a computer and powered on Therefore the SD memory card can be opened as a drive w...

Page 194: ...ighted and displaying the submenu items 2 Press the key to display the upgrade confirmation screen followed by pressing key to start the upgrade process Note The MiniMax will power down during the upg...

Page 195: ...ith respect to this product Dakota Ultrasonics specifically disclaims any implied warranties of merchantability or fitness for a particular purpose Some states or provinces do not allow limitations on...

Page 196: ......

Page 197: ...PC Software Firmware Note All software downloads and upgrades are available on our website at no additional charge Take advantage and stay current www dakotaultrasonics com...

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