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Nova Eclipse TG950 - Users Manual

9. PROBES AVAILABLE

Nova Eclipse TG950 - Users Manual

Several of the probes in this section may work best if modified slightly to
meet demanding application requirements. See Section 5.3

Содержание Nova 950 Series

Страница 1: ... 12 4 1 Power On Battery Check Auto Off 12 4 2 Probe Coupling 12 4 3 Basic Menu Selections and Controls 13 4 4 Calibration Procedures 17 4 5 THICKNESS MODE Sub Menu 18 4 6 ALARMS Sub Menu 19 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 Standar...

Страница 2: ... of corrosion and other conditions that can impair the safety and function of countless structures systems and materials Measurements are made with access to only one accessible surface 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 Th...

Страница 3: ...cteristic velocity of the test material distance divided by time e g inches or millimeters per microsecond divided by the round trip transit time microseconds yields total distance 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 t...

Страница 4: ...ures Ship Hulls Decking and Propulsion Components 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 an LED Readout provides easy readability of thickness data Backlight automatic or on off selectable Portability Bench Top instrument incorporating NDT Systems Easy Grip...

Страница 5: ...950 Users Manual 7 2 3 Reference Standards To calibrate the NOVA TG950 it is necessary to have one or more known thicknesses 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 Fo...

Страница 6: ...Users Manual 9 3 1 Display Features 1 Probe In Use 2 Echo Mode IP 1st 1st 2nd 2nd 3rd 3 Battery Level Indicator 4 Thickness Display 5 Velocity Reading Displays When or VEL pressed 6 Scan Bar Scale 7 Scan Bar 8 Units in or mm 9 Coupling Indicator 10 Operational Mode A Auto or M Modified 3 2 Touch Commands Some of the Touch Command controls are used to access specific functions Others have multiple ...

Страница 7: ...Nova 950 offers the ability to select either USB or RS232 for interface to a PC where required A driver supplied is necessary to operate the USB connection The switch located to the left of the RS 232 Connector is used for the selection When in the left position the RS 232 is active When in the right hand position the USB port is active NOTE The optional foots witch used for data logging to a PC w...

Страница 8: ...to Section 2 4 Using Couplants Before placing the probe on the Reference Standard note the Coupling Icon on the upper right side of the display With the probe uncoupled the Probe Coupling Icon appears as shown on the left with a space between the probe symbol and the horizontal bar that represents the surface of the test object When the probe is properly coupled the Icon changes to that Nova Eclip...

Страница 9: ... back through the Adjust Scale and DISPLAY Sub Menus and return to the Measurement Display Observe that the Scan Bar scale ranges between the desired Start and Stop values Measurement readings between Start and Stop will produce the analog view of the Scan Bar and both the display reading and the Scan Bar will remain displayed until the next valid reading is obtained If it is chosen not to use the...

Страница 10: ...ilable below the 3 initially shown selections Mode can be toggled between Contact and Delay with the Right and Left Arrow keys In the same manner Gates toggles between Auto IP 1 IF st 1 1 2 2 3 These selection options refer to the measurement st st nd nd rd interval IF First is interface echo to first back echo 1 2 is first back st nd echo to second back echo 2 3 is second back echo to third back ...

Страница 11: ...adout is a line reading Nom followed by the value from a previous setting The desired Nominal thickness Nom is set by using the Up and Down ARROW keys Nova Eclipse TG950 Users Manual 19 Press ENTER Any thickness measurement taken thereafter will be displayed as a value or from the Nominal setting An alternative way to set the nominal thickness value is to couple the probe to a reliable reference s...

Страница 12: ...g the surface and Stop is set to the nominal or maximum expected thickness However for special emphasis or any other reason other values can be set After the Start and Stop limits have been set press MENU three times to return to the Measurement Display An alternative short cut procedure to set the Scan Bar Start Stop limits is to press the MODE button and set the limits directly in the Measuremen...

Страница 13: ...and press ENTER A display will open as shown Nova Eclipse TG950 Users Manual 23 The display prompts for the number of rows and columns for the Log Use the Right and Left ARROW keys to scroll or toggle the number of Columns and Rows desired 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...

Страница 14: ...e into which thickness measurements are to be entered From the opening measurement display press LOG then ENTER to open the 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 Nova Eclipse TG950 Users Manual 25 To open a previously created File from the LOG FILES Display toggle down to Review and press ENTER All ...

Страница 15: ...ity 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 TG950 with a water or bubbler style probe where the length of the waterpath will per...

Страница 16: ... actually triggering the digital display This is very helpful when initially setting 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 o...

Страница 17: ...ideo trace you will not the Initial Pulse is synchronized with the falling edge of 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 wher...

Страница 18: ...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...

Страница 19: ...tions Surface Condition Prior to gaging remove performance hindering foreign Nova Eclipse TG950 Users Manual 35 substances from the material surface e g dirt loose scale corrosion soil flaking paint 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 prov...

Страница 20: ...cy This undesirable effect holds true for the material being gaged 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 ...

Страница 21: ... 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 Nova Eclipse TG950 Users Manual 39 the outer sheet Likewi...

Страница 22: ...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 TG950 has an RS 232 data port on the back panel of the 950 When connected to the serial port on a PC using the transfer cable included Logged Data Files are q...

Страница 23: ...pse TG950 Users Manual 42 9 PROBES AVAILABLE Nova Eclipse TG950 Users Manual 43 Several of the probes in this section may work best if modified slightly to meet demanding application requirements See Section 5 3 ...

Страница 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...

Страница 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 Nova Eclipse TG950 Users Manual 47 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 pur...

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