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NDT Systems Nova Eclipse TG930, User Manual

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Nova Eclipse TG930 - Users Manual

10

NDT Systems offers numerous ultrasonic couplants which cover virtually all
application areas for the NOVA TG930.  These specially formulated
couplants are recommended.  Contact NDT Systems for further information.

3.  DISPLAY AND CONTROLS FAMILIARIZATION

This Display Features Section is intended to familiarize the User with the

location and nomenclature applied to the most common display features. 
Other displays and display features respond to various Menu selections and

Nova Eclipse TG930 - Users Manual

11

Touch Commands.  These displays will be shown and described in 

Section

4, Operation Steps,

 and subsequent sections of the Manual.

Summary of Contents for Nova Eclipse TG930

Page 1: ...PS 13 4 1 Power On Battery Check Auto Off 13 4 2 Probe Coupling 13 4 3 Basic Menu Selections and Controls 14 4 4 Calibration Procedures 18 4 5 THICKNESS MODE Sub Menu 19 4 6 ALARMS Sub Menu 20 5 ADVANCED FEATURES 21 5 1 Scrolling B Scan 21 5 2 Data Logging 22 5 3 MODIFY SETUP 26 5 4 Ultrasonic Velocity 32 Longitudinal Ultrasonic Velocity Table 33 6 GAGING TIPS AND TECHNIQUES 34 6 1 Reference Stand...

Page 2: ...rface of the test object A large selection of high frequency single element contact delay line and bubbler type transducers can be used interchangeably to satisfy a multitude of applications 1 1 1 Basics of Ultrasonic Thickness Gaging The NOVA operates on a principle similar to Sonar but at much higher frequencies Megahertz range and electronic speeds An ultrasonic frequency sound beam is generate...

Page 3: ...ance traveled Since the total transit path is twice the actual thickness it is automatically divided by one half and displayed as a decimal thickness On test objects with smooth parallel surfaces the displayed thickness is true within the resolution of the last decimal place displayed Nova Eclipse TG930 Users Manual 5 Functional Diagram This round trip time of the echo is linearly correlated to th...

Page 4: ...ponents 1 3 Major Features Membrane sealed TOUCH COMMAND controls simplify setup and use 128 x 64 pixel high contrast graphic Liquid Crystal Display LCD provides simple plain text menus and easy readability of thickness data Backlight automatic or on off selectable Ultra portability a pocket sized handheld instrument incorporating NDT Systems Easy Grip custom extruded aluminum case State of the ar...

Page 5: ...cknesses of the same material as that of the test object Initial calibration procedures require reference samples representative of the material to be gaged Machined stepped wedges having thicknesses across the range of interest are convenient and commonly used reference standards For the purposes of familiarization with the NOVA TG930 it is recommended to use steel stepped wedges having several s...

Page 6: ...r information 3 DISPLAY AND CONTROLS FAMILIARIZATION This Display Features Section is intended to familiarize the User with the location and nomenclature applied to the most common display features Other displays and display features respond to various Menu selections and Nova Eclipse TG930 Users Manual 11 Touch Commands These displays will be shown and described in Section 4 Operation Steps and s...

Page 7: ... a saved setup or to modify default automatic setups The Battery Level Indicator icon appears on the left side of the LCD display indicating the current battery charge state The NOVA TG930 comes with two AA size rechargeable NiCad batteries installed in its battery chamber If the Battery Level Indicator fails to register more than approximately 20 full scale it is recommended that the batteries be...

Page 8: ...ted to range between 0 050 and 0 100 inch 1 27 and 2 54mm a good Start point might be approximately 0 045 inch 1 14 mm and the Stop point at approximately 0 110 inch 2 80 mm This range will produce the greatest visual motion within the range of expected thickness On the other hand under the example above if the scale is set to Start and Stop at 0 000 and 2 500 inches 0 00 and 63 50 mm the range of...

Page 9: ...hen using NDT Systems Inc NOVA Transducers This method is highly recommended for optimum performance and measurement accuracy Nova Eclipse TG930 Users Manual 17 Direct Contact transducers e g the C11 can also be used The Contact option will yield a measurement range of 0 062 to 20 00 with resolution of 0 001 0 01 mm in the NORMAL mode The Contact HR High Resolution mode also permits certain high f...

Page 10: ...ation toggle down and set Hi Thick to the known high thickness It may be necessary to repeat this Nova Eclipse TG930 Users Manual 19 procedure until the precise thicknesses are set Following two point calibration press MENU to return to the Measurement Display Velocity Calibration For the Velocity Measurement and Calibration procedure refer to Section 5 3 Ultrasonic Velocity As recommended with an...

Page 11: ... object On the display a two dimensional pictorial image is produced The horizontal dimension represents the extent of the scan movement and the vertical dimension represents depth thickness below the surface of the test object Following initial setup and calibration activate the B Scan by pressing the SCAN button on the RIGHT ARROW key The display will present a series of scrolling dots moving ri...

Page 12: ...or toggle the number of Columns and Rows desired Nova Eclipse TG930 Users Manual 23 The number following Avail is the number of data points available for Logged data Toggle down to highlight Create and press ENTER The following displays will be seen The flashing cell outline indicates the cell available for data and its address Row Col The Grid Log File is ready for data to be entered Instructions...

Page 13: ...he LOG FILES Sub Menu If a new Grid or Linear File Type is to be created follow the procedures for producing Grid or Linear File Types above To open a previously created File from the LOG FILES Display toggle down to Review and press ENTER All existing Files will be listed by File Name with the first 13 characters displayed followed by a period if there are more than 13 characters Toggle or scroll...

Page 14: ...y Select Pos or Neg half cycle VEL Velocity Adjust ZERO Zero Adjust IP Blk Initial Pulse Blocking Gate Thresh Thickness Trigger Threshold 0 100 IF Blk Interface Blocking Gate while in Delay mode MeasTm Selects the time period the AGC is actively looking for an echo Example This feature is helpful while using the TG930 with a water or bubbler style probe where the length of the waterpath will permi...

Page 15: ...tting up difficult application specific tests If you are uncomfortable with a test results in this mode then second thought should be given to the question of whether or not the specific application is ideal for digital gaging Often complex geometry can create circumstances whereby the user must use an A trace gage in order to evaluate the received echos on a continuous basis The Figure represents...

Page 16: ...f the sync trace Time measurement for thickness starts here This point is also known as T 0 From this point we have incorporated a dead zone known as an IP Blocking gate where no measurements are possible but time continues to count You can then note that the IF or interface appears next In the delay mode this is where the start of measurement occurs In this example the signal is measuring the 1st...

Page 17: ...ecorded and reference standards are unavailable velocity calibration will produce accurate measurements To set velocity while in the Measurement Display momentarily depress either of the Up or Down ARROW keys VEL or VEL Velocity with the currently stored velocity value is displayed immediately below the thickness readout The ARROW keys can then be used to toggle or scroll velocity until the displa...

Page 18: ...ring foreign substances from the material surface e g dirt loose scale corrosion soil flaking paint Nova Eclipse TG930 Users Manual 35 Excessive surface roughness can cause erratic extremely low or no thickness readout In such cases consider scraping sanding grinding or filing the surface smooth enough to obtain a proper response provided such a procedure and the amount of material removal are acc...

Page 19: ...d as well as for the probe Although it is always good practice to re calibrate for significant changes in ambient temperature the effect can normally be ignored for modest changes The situation becomes more complex when the material temperature is considerably different from ambient One solution is to calibrate on a reference sample at the same temperature as the material Another solution is to ca...

Page 20: ... thickness other than that of the test material 7 4 Worn or Malfunctioning Probes Immediately replace any probe that is malfunctioning or showing excessive or uneven wear 7 5 Material Stacks It is not possible to gage the stack thickness of uncoupled material sheets piled upon one another Ultrasound reflects totally from the back surface of the outer sheet Likewise it is not recommended to attempt...

Page 21: ...TG9XX DTPW TG900 Series Data Transfer Program for Windows This Accessory Program is essential for handling Logged data even relatively small data files Manually transcribing Log Files is time consuming and subject to possible errors The NOVA TG930 has an RS 232 data port next to the probe connector When connected to the serial port on a PC using the transfer cable included Logged Data Files are qu...

Page 22: ...Nova Eclipse TG930 Users Manual 42 Nova Eclipse TG930 Users Manual 43 9 PROBES AVAILABLE ...

Page 23: ...Nova Eclipse TG930 Users Manual 44 Nova Eclipse TG930 Users Manual 45 Several of the probes in this section may work best if modified slightly to meet demanding application requirements See Section 5 3 ...

Page 24: ...battery life will be reduced See Section 4 1 Power On Battery Check Auto Off To change batteries loosen the large cap screw on the bottom of the gage with a coin or screwdriver Remove the discharged batteries and replace them with two new disposable AA size alkaline or NiMH rechargeable batteries Install them with the positive polarity inward Replace and tighten the battery chamber cap screw If th...

Page 25: ...ument or because of circumstances the exclusive remedy provided herein fails of its essential purpose or operates to deprive either party of the substantial value of its bargain then the Purchaser s exclusive remedy will be the return of the purchase price for the instrument The liability of NDT Systems shall in no event be greater then the full amount of the purchase price for the instrument Nova...

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