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20

20

ZERO & VELOCITY

The next two functions, VEL and ZERO are adjustments necessary to "calibrate" the gage to the
accurately measure the specific material under test.

In our example, using a 0.500 inch thickness step, we have yet to perform any operations to
"calibrate" the Thickness readout. Most probably the reading is close to 0.500 inch, since the
FACTORY setup defaults are deliberately designed to produce nearly correct calibration for a
contact transducer being used on steel having longitudinal sound velocity of 0.2330
inches/microsecond.

21.

As a first step in becoming familiar with the VEL and ZERO functions, lets complete the
calibration for thickness measurement using the step block in our example. 

VEL - Set the cursor at VEL and adjust it to 2330 In/us.

ZERO - Using the Left/Right arrow, reposition it at ZERO, probe zero control position. Using the
Up/Dn arrow keys adjust the thickness reading to 0.500". When 0.500 inch [or whatever the
known actual thickness of the step] is achieved in Thickness readout, the upper range
calibration is complete. Note that zero may change through up to 5 or 10 counts (on the display)
before the indicated thickness changes. Choosing zero roughly at the mid-point of the range
needed to move from 0.499 inch to 0.501 inch. This procedure can improve thickness gaging
precision.

22.

Remove the transducer from the 0.500 inch step and couple it to the other steps on the block. If
the test block has been accurately measured and the material is steel with a VELOCITY (VEL)
of 0.2330 in/us, the other step measurements should be within ±0.001 inch of the actual
measured values and reproducible.

21.

If some material other than steel is used, a different procedure will be required. For a
transducer of similar type as used in these procedures, reset the ZERO to approximately
that of the default (130). Depress the up arrow key to position the cursor at VEL (velocity).
With the transducer coupled to the thickest step, use the Up & Down arrow keys to
increase/Decrease the velocity until the known thickness of the material is displayed on
the thickness readout.

 NOTE : to measure to thinnest step on the block it may be necessary to adjust IP-

BLK as per step 15 above

Содержание Avenger EZ-AWS

Страница 1: ...PERATOR S MANUAL TG400 Ultrasonic Thickness Gage Featuring SplitView SplitScan AutoTrack NDT Systems Inc 17811 Georgetown Lane Huntington Beach CA 92647 Phone 714 893 2438 FAX 714 897 3840 Rev 1 0 07 06 ...

Страница 2: ... may have a question with C Chapter 2 deals with the menu structure a description of the features This would be recommended reading There are a few images to help you better understand the concepts C Chapter 3 4 is where the features are described in more detail through tutorials on various methods of operation You will also find this chapter help teach how to select the best transducer for the ap...

Страница 3: ...20 000 nanoseconds Synchronization IP Initial Pulse IF Interface Delay Transducer Modes Single or dual element Display Modes RF positive negative full wave rectified Flaw Mode Two 2 gates selectable positive or negative threshold Visible and audible alarms triggered at pulse repetition rate Gate start variable over entire displayed range Gate width variable from gate start to maximum displayed ran...

Страница 4: ...typical depending upon display back light usage 3 AA NiMH furnished Battery Charger 5 hours for full charge Transducer Cable Lemo Connectors Connectors Size Top Section 3 25 W x 7 L x 1 4 D Weight Including Approximately 1 pounds 0 6kg Battery Pack ...

Страница 5: ...iety of keys menu selections are available to change continuous variables such as range delay gate positions alarm levels and reject SCROLLING When a key is continuously depressed to change a variable the effect is referred to as scrolling Scrolling produces either a visible change in the display a digital readout of the changing value of the variable or both TOGGLING Toggling refers to the kinds ...

Страница 6: ...c A free catalog will be sent on request by contacting Customer Information at NDT Systems Inc 17188 Georgetown Lane Huntington Beach CA 92647 phone 714 893 2438 FAX 714 897 3840 In many cases equivalent transducers produced by other manufacturers will also yield acceptable results It should be kept in mind though that no matter how capable the ultrasonic instrument system performance and test res...

Страница 7: ...split Opt1 is reserved for future use MENU FLOW The following represents the menu flow of the TG400 Pressing the MENU ESC key repeatedly will sequence through the menus as shown Note The branch if menu choices is determined by the MODE selection in the MAIN menu I E if FLAW were selected in the main menu under the MODE command then the branch would follow the flaw mode selected to GATE1 then GATE2...

Страница 8: ...s using many kinds of transducers to be successfully performed highly precise flaw detection tests may require refinements to the default variables to better match transducer instrument characteristics GAIN Used to adjust the amplitude of the A trace display Increasing or Decreasing the GAIN will cause the A trace signal to increase or decrease in amplitude Directly Adjustable via up or down arrow...

Страница 9: ...e useful ness of this feature would be evident on material with varied attenuation properties such as painted and non painted surfaces or corroded back surfaces AGC may also help overall reading accuracies due to the fact that the thickness gate will be reading to the same height on the echo flank first rising edge It is generally not acceptable to use AGC with Dual Element Transduc ers used for c...

Страница 10: ...crease or Decrease the Measurement Threshold level Any echo or echo half cycle with amplitude equal to or greater than the Thickness Gate Threshold will be measured The threshold gate is the bar on the left of the A Trace frame extending to the first echo in the figure Directly Adjustable via up or down arrow ECHO BLOCKING GATE ECHO BLK Allows Increase or Decrease the length of the echo blocking g...

Страница 11: ...ovide optimal personal viewing BACKLIGHT BKLT Turns the backlight to AUTO ON or OFF Auto will turn the backlight on while making measurements OO will turn the backlight on continuously and OFF will leave the backlight off at all time It is recommended to leave the setting set to off if using the gage in high ambient light conditions This will conserve battery life You will not notice any better vi...

Страница 12: ...w can not exceed the set Range of the Main Trace window For instance if the Main Trace is set to 3 the Track window can not be set to 4 Usually the Track window is something like 20 40 of the Main Trace window This operates with AutoTrack Mode ON or OFF ALARM MENU ALARM STATUS Turns Alarms on off LO THK Sets Low thickness alarm point HI THK Sets High thickness alarm point STATUS MENU ALRM OFF No A...

Страница 13: ...12 12 instrument setups Note If the gage is powered ON with the ENTER button depressed the Factory Default setup will be loaded ...

Страница 14: ...hat the water path to the IF will be seen as well as the IF to destination target back wall Be sure this rule stays in place throughout the water path change probability It is OK to select a long MAIN range and a short IP For instance I even set 20 inches as a MAIN range and then used a IF range of 2 The IF range can never be longer than the MAIN range We think we rang this all out but if a limit ...

Страница 15: ...ces However such transducers will be relatively expensive and not readily attainable Standard inexpensive delay line transducers highly damped in the frequency range of 10 to 20 MHZ will ordinarily produce good results down to approximately 0 008 inch 0 20mm Given smooth surfaces in metals having relatively low attenuation like wrought steel or aluminum such transducers can be used to gage up to 0...

Страница 16: ...and be used over a broad range of thicknesses test material attenuation may dictate a compromise While higher frequencies produce thinner thickness resolution attenuation is more pronounced at higher frequencies For relatively flat smooth surfaced steel or aluminum test objects highly damped contact transducers in the frequency range from 5 to 10 MHZ generally will produce acceptable results in th...

Страница 17: ...allic Test Materials Virtually all the techniques and applications described above can be applied to a host of non metallic and composite materials It is not possible to cover the numerous applications in this manual Transducer selection for non metals often is much more involved However The TG400 s unique design can accommodate a huge variety of transducer types For advice contact our Transducer ...

Страница 18: ...d way of observing these effects and to become quickly familiar with TG400 s controls is to perform the following procedure 1 Attach a highly damped broadband transducer such as the OPTIMA CHG053 or NOVA C11 5 MHZ 3 8 inch element diameter to the micro dot connector on the ML 01 transducer cable supplied with TG400 Insert the Lemo connector in the receptacle marked with a dot on the top closure of...

Страница 19: ...tive gain accordingly 11 To become familiar with the RANGE function position the cursor at RNG The up arrow key will squeeze the echos on the A trace to the left that is except for the initial pulse If multiple back echos are present they will move toward the left and approach each other more closely In our 0 500 inch steel block example depress the UP arrow key until the first back echo originall...

Страница 20: ...At this point use the Up Dn arrow keys to change the length of the IP BLK gate in order to observe the effects of the control 16 The IF BLK interface echo blocking functions in a similar fashion as the IP BLK but when Interface Synchronization IF is selected IF Sync automatically starts the T gate at the leading edge of the interface echo the echo between the delay line and the test object surface...

Страница 21: ...n Thickness readout the upper range calibration is complete Note that zero may change through up to 5 or 10 counts on the display before the indicated thickness changes Choosing zero roughly at the mid point of the range needed to move from 0 499 inch to 0 501 inch This procedure can improve thickness gaging precision 22 Remove the transducer from the 0 500 inch step and couple it to the other ste...

Страница 22: ... when using single element transducers with thin elastomeric membranes or on coated test objects 23 Cursor to ECHO BLOCKING GATE ECHO BLK Note the thick horizontal bar on the Thickness gate Use the right arrow key to select the length of the echo blocking gate that is appropriate to block out any unwanted signals between multiple echos in the thickness mode The FACTORY default value is 200 inch EC...

Страница 23: ...mponents This mode of display RF reveals all the details of the signal If necessary to more faithfully reproduce the waveform in the figure above it may be necessary to key to GAIN and change the gain Now examine the details of the back echo The first half cycle is negative going but has less relative amplitude than the next half cycle with respect to each following half cycle or which is positive...

Страница 24: ...range of the TG400 has been set to a long range and the RF display is selected there will be poor detail in the presentation of the RF In order to expand the RF display of the back echo under such condition delay can be used to reposition the back echo very near the left side of the A trace Then reducing full scale range to 0 50 12 7mm reproduces the RF of the back echo similar to that of a much t...

Страница 25: ...the constant distance paths taken by the sound beam in traversing the dual delay lines a measurement can be made of the travel distance in the test object only Since the sound beam travels at a slight angle into and out of the test object the path taken is slightly longer than in the case where the sound beam enters and exits perpendicular to the test object surface Calibration at a specific thick...

Страница 26: ...RO to produce the thickness readout corresponding to a known thickness in this case 0 500 inch Note when you check the measurement of the 0 200 inch step note it produces 0 205 inch This error is due to V Path Error mentioned above Then check the thicknesses in between and note the variations 4 With the error having been determined to be 0 005 inch in the range from 0 200 to 0 500 inch the safer w...

Страница 27: ...00 If it close adjust the VEL to adjust to exact material velocity Option B Connect TG506 Transducer From MAIN Menu Select SETUP and PICK the appropriate transducer from the list Press ZERO ECHO front panel key The gage will display the screen to the right requesting you to place the probe on the ZERO Disc and then pressing the ENTER key From this point place the transducer on a thickness represen...

Страница 28: ...In this case the ECHO BLK will need to be extended out far enough to pass the multiple echo cycles of the first echo This will limit the low end thickness capability In the lower image a TG560P transducer is attached In this case the transducer is optimized to allow for thinner material measurement This technique can be used with many dual element transducers to measure painted or coated objects o...

Страница 29: ...ove right when you move the cart to the left the B Scan Cursor move to the right ENCODED L L Left to Left When you move the cart to the right the B Scan Cursor move right when you move the cart to the left the B Scan Cursor move to the right SCALE Adjusts the speed of the timed B Scan OR the represented Distance the scanner moves For instance when in the TIMED mode a scale of 10 takes 10 seconds p...

Страница 30: ... on screen from the thickest area to the thinnest area of your sample 2 Go to the SETUP Menu and select the PX506 if it is shown If not select TG506 This should set the instrument up in general terms Adjustments for a particular probe now will have to be made 3 Set Range to about 0 750 4 Set Delay to about 0 000 5 Set probe on thin section of test block For instance 0 250 Do not worry yet about th...

Страница 31: ...uld not have to go through the extra steps 11 Once calibrated press the B SCAN Key 12 Cursor to TYPE and use the Up Dn arrows to select T SCAN This will provide a Cross Section view of the area being inspected 13 Move the Cursor to Select POS on the Menu 14 Use the Up Dn arrows to select ENCODED L R or any other desired plotted motion 15 Place the cart on a surface to be inspected and the pointer ...

Страница 32: ...aracteristics such as the presence of scattering reflectors impedance an isotropy Modula and other physical and mechanical properties all interact with ultrasonic sound beams somewhat differently than in metals Despite the differences most polymers and glasses some ceramics and composite materials can be tested with the same transducers and procedures as for metals except for the obvious adjustmen...

Страница 33: ...e AA style batteries inserted into the bottom panel via the rear panel access cap The gage is charged via an external battery charger Once fully charged the TG400 will run for up to 20 hours before requiring another charge Charge time is 6 8 hours for a full charge from empty The TG400 is also capable of running from Alkaline batteries available from many outlets should you need to use the unit wh...

Страница 34: ...ing optional TG400 accessories are available ATRP1 TG400 Carry Pouch A light weight leatherette protective case The TG400 fits firmly into a case like compartment supported at an adjustable angle stand The integrated stand also snaps around a belt Refer to the appropriate section within this manual for instructions on the use of the Data Logger if installed ...

Страница 35: ... 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 Inc shall in no event be greater then the full amount of the purchase price for the instrument Any attempt by NDT Systems Inc to rep...

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