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Manual No. OM5000
Jan X/04 Ver 1.40

iii

5.20 GATE DISPLAY SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.21 GATE DISPLAY "T" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.22 GATE DSPLAY "IP" (Initial Pulse, or Main Bang) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.23 GATE DISPLAY "IF" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.24 GATE DISPLAY "TAC" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.25 ALARM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.26 Setup Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.27 Save and Recall Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

FRONT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DELETE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RECALL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

STORE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

EDIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

EXT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.29 Pulser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.28 Store Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.30 T-GATE/START/STOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.31 ANALOG OUTPUT OFFSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.32 CONTACT - DELAY/IMMERSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.33 ALARMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.34 PULSE RATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.35 MAT'L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6. OPERATIONAL SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1

CONTACT THICKNESS GAGING SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.1 Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.2 Turn Power On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.3 Select Transducer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.4 SYNC SWEEP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.5 Initial SCOPE SWEEP SPEED Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.6 Adjusting Echo Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.7 SYNC SWEEP DELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.8 Setting DAMP Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.9 Setting IP-GATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.10 Setting T-GATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.11 Choice Between AGC and Manual Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.12 Thickness Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.13 Gaging Difficulties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2

DELAY LINE AND IMMERSION GAGING SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2.1 To Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2.2 Turn Power On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2.3 Select Transducer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2.4 SYNC SWEEP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2.5 Initial SCOPE SWEEP SPEED Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2.6 Immersion Transducer Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2.7 Adjusting Echo Amplitudes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2.8 SYNC SWEEP DELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2.9 Setting DAMP Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2.10 Setting IP-Gate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2.12 Setting T-Gate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2.13 Choice Between AGC and Manual Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2.14 Thickness Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2.15 Immersion/Delay Line Gaging Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2.16 Gaging Difficulties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.3 PULSE RATE (PRF) SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Содержание NovaScope 5000

Страница 1: ......

Страница 2: ... 2 2 Scope Display 7 4 2 3 A Scan Presentation 8 4 2 4 Resolving Power and Sensitivity 10 4 3 THICKNESS GAGING MODES 12 4 3 1 Contact Mode 12 4 3 2 Immersion Delay Line Mode 12 4 4 GATES 14 5 FUNCTIONAL DESCRIPTION OF NovaScope CONTROLS 16 5 1 GENERAL TOUCH INTERFACE INSTRUCTIONS 16 5 2 SCOPE SWEEP SPEED 18 5 2 1 VARIABLE SWEEP SPEED CONTROL 18 5 3 SCOPE INTENSITY 18 5 4 SCOPE FOCUS 18 5 5 SCOPE T...

Страница 3: ...EP 28 6 1 5 Initial SCOPE SWEEP SPEED Adjustment 28 6 1 6 Adjusting Echo Amplitude 28 6 1 7 SYNC SWEEP DELAY 30 6 1 8 Setting DAMP Control 30 6 1 9 Setting IP GATE 30 6 1 10 Setting T GATE 30 6 1 11 Choice Between AGC and Manual Gain 34 6 1 12 Thickness Calibration 34 6 1 13 Gaging Difficulties 34 6 2 DELAY LINE AND IMMERSION GAGING SETUP 34 6 2 1 To Start 34 6 2 2 Turn Power On 34 6 2 3 Select Tr...

Страница 4: ...RATION WITH VELOCITY 50 7 3 MATERIAL VELOCITY MEASUREMENT 51 7 4 CALIBRATION OF ALARMS 51 7 4 1 To Calibrate Only the LO Control 51 7 4 2 To Calibrate Only the HI Control 51 7 4 3 To Calibrate for LO HI Combination 52 8 CALIBRATION SAMPLES 52 9 TRANSDUCER SELECTION 52 10 COUPLANT SELECTION 52 11 AC POWER START UP REQUIREMENTS 53 11 1 SAFETY 53 11 2 AC LINE VOLTAGE SELECTION 53 11 3 AC LINE FUSE 53...

Страница 5: ...ope input or output terminals A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation DANGER ARISING FROM LOSS OF GROUND Upon loss of the protective ground connection all accessible conductive parts including knobs and controls that may appear to be insulating could render a dangerous electric shock USE THE PROPER POWER CORD Use only the p...

Страница 6: ...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 than the full amount of the purchase price for the instrument Any attempt by NDT Systems Inc to repair or replace any instrument sold hereunder shall not co...

Страница 7: ...ay T Gate IP Gate IF Gate T Gate Start Stop TAC Gate Switchable To 50 ns Div Continuously Adjustable 50 MHz A Scan Selectable Gate Traces IP IF T or TAC Full RF Positive and Negative Rectified Delay Sync 1 us To 80 us Thickness Gate Adjustable Sync 0 25 To 20 us On Contact 1 0 To 90 us On Delay And Immersion 0 1 To 8 0 us Selects Polarity Of Echo s Leading Half Cycle Multi Adjustable Time Compensa...

Страница 8: ...th stationary or in motion products using either a manual or automatic mode of operation The NovaScope which operates from either a standard nominal 115 or 230 VAC power outlet It also features a highly versatile dual digital port This port offers both high speed binary or RS 232C digital interfacing with peripheral equipment computers printers other test instruments and NDT Systems Inc s PortaSca...

Страница 9: ...4 GAGING STATIONARY PRODUCTS Many products with simple or complex shapes contours can be gaged manually with small handheld transducers contact or delay line types For gaging on particularly sharp contours or in very small spots effective results can be obtained using a bubbler or immersion transducer with a finely focused ultrasonic beam A non contact immersion type transducer mounted in a miniat...

Страница 10: ... a process known as attenuation a combination of wave scattering from inhomogeneities and absorption Sound waves typically attenuate much more in gases than in many common liquids and solids Also attenuation normally increases rapidly with frequency for example high frequency MHz range ultrasonic energy travels only exceedingly short distances through air before it is virtually attenuated Ultrason...

Страница 11: ...63 5 90 5 85 5 66 6 07 1 48 4 65 may exhibit wide velocity variations depending upon alloy or type NOTE These reported ultrasonic velocities are only approximations because of effects due to chemical and physical variations 4 1 2 Thickness Gaging Concept The NovaScope operates on a pulse echo principle quite similar to that used for ranging with both sonar and radar With regard to the NovaScope a ...

Страница 12: ...sn t exhibit excessive unknown inherent velocity variations to permit accurate thickness measurement In fact many common industrial materials have velocities so constant that very precise measurements can be made However changes in composition grain structure direction and even temperature or residual applied stress can affect the characteristic velocity for a given material resulting in thickness...

Страница 13: ...cts as an echo from the material surface adjacent to the transducer while the remainder of the pulse propagates through the material and reflects back as an echo from the opposite parallel surface These two echos from the material surfaces sequentially impinge on the transducer and are thereby converted into similarly shaped and similarly time sequenced electrical pulses This pair of electrical pu...

Страница 14: ...the waveform in Figure 2 can be inverted or flipped Thus the side of the subject waveform with only one peak half cycle could be oriented in either the positive or negative polarity direction A single half cycle rectified display will be used in this Operating Manual except where it is more informative to use the RF display 4 2 3 A Scan Presentation The most common scope display for observing ultr...

Страница 15: ...ans will result Thus it is not possible to differentiate between material thickness and velocity variations by using the pulse echo ultrasound method even with the A scan scope readout Fortunately for applicable materials changes in echo round trip time essentially can be ascribed to thickness changes rather than ascribed to unknown inherent velocity variations in a given material One fundamentall...

Страница 16: ...nterface to first back surface echo period The dotted curve across the tips of the echos in Figure 5 shows the rate at which the amplitude of the echo multiples decreases or decays and is related to the degree of ultrasonic attenuation for a given material This entire echo pattern of such multiples is sometimes called a ringing pattern 4 2 4 Resolving Power and Sensitivity One of the performance c...

Страница 17: ...echo ultrasonics and A scan presentations is sensitivity For thickness gaging it refers to the overall equipment ability both instrument and transducer to detect an echo from the back surface of a given material Equipment that detects back surface echos from thick materials or attenuative materials is said to have a higher sensitivity than equipment that is unable to detect such echos Sensitivity ...

Страница 18: ...ith the superimposed IF echo to the return of the first back surface echo This is called synchronizing the thickness echo period measurement with the IP or main bang or more commonly IP sync With IP sync the scope sweep initiation is also synchronized with the IP This is called IP sweep sync Note the distorted non ideal and quite wide signal on the left side of the trace in Figure 7 representing t...

Страница 19: ...line transducer coupling mode serves the important purpose of delaying the initiation of the IF echo until the receiver has fully recovered from being undesirably saturated by the high amplitude IP Thus considerably better resolving power and hence thinner material gaging results when compared to contact gaging The thicker the buffer material the longer it takes the ultrasonic pulse to travel thro...

Страница 20: ... be conveniently shown time aligned on an additional trace located beneath the respective A scan trace as shown in Figure 10 a This standard type of gate shown has a rectangular waveshape along the lower baseline trace which sweeps in synchronization with the associated upper A scan trace The gate is on only during the time that the trace is elevated above the normal gate baseline position It turn...

Страница 21: ...e noise will cause the automatic thickness gate to erroneously stop or hang up Such noise can be blocked from interfering with the setting of the thickness gate by simultaneously using another adjustable gate called a blocking gate Figure 10 c shows how a blocking gate can be adjusted so its width is long enough to block the IP noise which would otherwise prevent the thickness gate from properly t...

Страница 22: ... permitting the user to save and recall all setup parameters with up to 60 alphanumeric characters With this you can save descriptive setup names For example A file could be saved including the users name transducer used and part under inspection all as part of the file name There are a couple of options to interface with these controls First and foremost to select any control to adjust simply tou...

Страница 23: ...move to the velocity display mode Another touch would toggle the position back to thickness Figures 11 and 16 can be used as a convenient reference for locating each of these controls during their description Section 4 of this manual should be read and understood before proceeding with this section ...

Страница 24: ...ntrol for material thickness or ultrasonic velocity compensation 5 9 ZERO A time delay control for calibrating the readout at the thin end of the thickness range to be gaged Technically it automatically compensates for 1 inherent time delays in the electronics 2 An extra half cycle that is sometimes required in the T GATE to produce the most reliable practical thickness readout 3 Slight mechanical...

Страница 25: ...ansducer operation When the SWEEP SYNC switch is in the IF position and with the sidepanel CONTACT DELAY IMMERSION switch in the DELAY IMMERSION position the sweep initiates from the IF for normal delay line transducer or immersion transducer operation When the SWEEP SYNC switch is in the DELAY position the adjustable DELAY control delay sync is activated to allow the sweep to be delayed from the ...

Страница 26: ...witch during delay line or immersion transducer gaging A IF To First back surface echo in 1st switch position B First back surface echo to first multiple in 2nd switch position C First multiple to second multiple in 3rd switch position D Arbitrary selection of multiple period with switch in 3rd position ...

Страница 27: ...T Gate See Figure 14 Also as mentioned in Section 5 18 and shown in Figure 12 d the IF Gate can be adjusted to choose on which multiple echo period the T Gate synchronizes The IF Gate is operational whether or not it is being displayed 5 24 GATE DISPLAY TAC TAC or Thickness Amplitude Compensation is a supple mental adjustable gate that changes the receiver amplifier gain as a function of time alon...

Страница 28: ...tact Gaging Blocking IP noise B Immersion Gaging Blocking potential waterpath noise between IP IF echo Preliminary setup Slow Sweep Speed Note Blocked Noise echo occurring prior to IF echo and back echo pattern C Delay line transducer Gaging Blocking plastic delay line path just prior to IF echo ...

Страница 29: ...al No OM5000 Jan X 04 Ver 1 40 23 FIGURE 14 Use of IF Gate to block noise following IF Sync Sweep mode during immersion or delay line transducer gaging FIGURE 15 TAC Gate and its three adjustable functions ...

Страница 30: ...ed setup You will be prompted for confirmation of the request 3 RECALL highlight a desired setup and then press RECALL The setup will be recalled and you will be returned to the front panel At this point you may change the setup in any way 4 STORE This option performs an option similar to save as allowing the user to save a setup with an existing name on the list Caution is recommended in this cas...

Страница 31: ...ding you that the setting will be save internally c Press the EXT button You should notice that the text over the Save Recall screen reflects External device selected d You will now notice the EXT button name has changed to INT internal You may now select STORE to save the existing setup to the EXTernal device under the same name as you did under the INTernal setup name Otherwise you may select NE...

Страница 32: ...libration parameters under the existing file name You will be prompted for confirmation as all settings associated with this name will be changed If you desire to save a given setup under a new name it is advised to use the NEW function Pressing SETUP leads to the following screen Pressing NEW will provide the Pop Up keypad ...

Страница 33: ...IMMERSION switch 5 33 ALARMS Three function alarms for indicating thickness readings below a selectable lower tolerance LO above a selectable upper tolerance HI or both LO HI The four position switch activates the alarm s and permits the selection of either the LO HI or combination LO HI function The LO and HI controls adjust the respective alarm trigger levels Out of tolerance is indicated by the...

Страница 34: ...liminary experimentation may be necessary to determine the optimum choice of transducer Couple the selected transducer using a suitable liquid couplant to the material or sample of the material to be gaged See Section 10 regarding choice of ultrasonic liquid couplants 6 1 4 SYNC SWEEP Set switch to IP position 6 1 5 Initial SCOPE SWEEP SPEED Adjustment Couple the transducer to the thickest step on...

Страница 35: ...Manual No OM5000 Jan X 04 Ver 1 40 29 ...

Страница 36: ...Until Control Clicks 1 4 Turn CW For Contact and Delay Line Transducers for Immersion Transducers 0 Position Full CCW Turn Off by Setting TAC AMPLITUDE to Off VIRTUAL SIDEPANEL CONTROLS PULSER SECTION T GATE SECTION START Switch STOP Switch CONTACT DELAY IMMERSION Mode Switch ALARMS SECTION PULSE RATE SECTION MAT L SECTION Set Switch to LO CONTACT DELAY LINE IMMERSION Inoperative POS NEG POS POS N...

Страница 37: ... of the back surface echo 3 the least baseline noise immediately following IP and just prior to the first back surface echo 4 the least overall echo distortion and 5 a relatively high echo amplitude See Figure 18 Note that the temporary use of the optional RF VIDEO display can be helpful when setting the DAMP control While very slowly rotating the DAMP control all of the above mentioned optimum wa...

Страница 38: ...ay Sync During Contact Transducer Gaging of Thicker Materials A Without Sweep Delay and sweep speed expansion first back surface echo highly compressed causing poor visibility of echo details B With Sweep delay and sweep speed expansion first back surface echo details clearly visible ...

Страница 39: ...r DAMP Control Adjustment for Contact Gaging A POSITIVE VIDEO Proper setting of damp control B POSITIVE VIDEO Improper setting of damp control C RF VIDEO Proper setting of damp control same setting as 17a D RF VIDEO improper setting of damp control same setting as 17b ...

Страница 40: ...Manual No OM5000 Jan X 04 Ver 1 40 34 FIGURE 19 Proper A Scan and T Gate Sync for Contact Gaging NOTE IP Noise on extreme left blocked by preliminary adjustment of IP Gate ...

Страница 41: ...MMERSION position If immersion gaging is to be used see Section 6 2 15 for additional information 6 2 2 Turn Power On Refer to Section 11 regarding the proper setup for using AC line sources and corresponding line fuses The AC Line Voltage Selector switch and line fuse on the rear panel of the NovaScope must be set to match the AC line voltage Turn power on by pressing the PWR switch to its inner ...

Страница 42: ... desirable location along the A scan trace See Figure 20 During the initial operational setup it will be necessary to go back and forth between IF and SYNC SWEEP DELAY Once the NovaScope is set up and calibrated it is optional as to whether or not to use Sync Sweep Delay continuously during the gaging procedure Since Sync Sweep Delay is always triggered synchronized from the IP any waterpath chang...

Страница 43: ...ransducer Gaging A Positioning and sweep expansion of IF Echo normally observed only against left side of display in IF sync mode T Gate shown B Positioning and Sweep expansion of first back surface echo or multiple echos normally possibly Compressed on IF Sync or for thicker or lower ultrasonic materials T Gate mode shown ...

Страница 44: ...mersion or Delay Line Transducer Gaging with SYNC SWEEP DELAY Control Operational A Negative VIDEO Proper setting of Damp Control B Negative VIDEO Improper setting of Damp Control C RF VIDEO Proper setting of DAMP control same setting as 20a D RF VIDEO Improper setting of damp control same settings as 20b ...

Страница 45: ...cked from false triggering the T Gate as shown earlier in Figure 14 6 2 12 Setting T Gate Set the GATE DISPLAY switch to the T position to display the T Gate the IP Gate and IF Gate remain operative even though the GATE DISPLAY switch now prevents their display Optionally set the SYNC Section T GATE to 1st for IF echo to first back surface echo gaging The T Gate should now synchronize between thes...

Страница 46: ...s readout Water multiples result from the multiple reverberation of ultrasonic pulses between the transducer and the near surface of the material This can sometimes cause a spurious echo pattern overlap condition which visually appears similar to the Rep Rate overlap phenomenon described in Section 6 3 Water multiples and Rep Rate overlap are identified by their relatively rapid movement across th...

Страница 47: ...d 3 19 2 10 3rd 2 26 1 3 10mm 1st 6 4 19 1mm 10mm 2nd 3 1 9 1mm 10mm 3rd 2 2 6 4mm 100mm 1st 34 3 101 6mm 100mm 2nd 17 2 50 8mm 100mm 3rd 11 2 33 0mm TABLE IV Waterpath Limits During Immersion Transducer Gaging RANGE SWITCH NOMINAL WATERPATH LIMITS POSITION MINIMUM MAXIMUM 1 0 2 Rep Rate Dependent 10 1 0 Rep Rate Dependent 10mm 5 1mm Rep Rate Dependent 100mm 25 4mm Rep Rate Dependent Rep Rate Over...

Страница 48: ...identified by their movement across the display while the waterpath is being changed Decreasing the waterpath can eliminate the condition if a slower Rep Rate isn t desired Another similar spurious echo phenomenon which can occur during immersion or delay line transducer gaging is known as water multiples see Section 6 2 14 Use as high a Rep Rate as possible to maintain the brightest possible disp...

Страница 49: ...ntact Transducer Gaging Material to thick or material velocity to slow for selected Rep Rate Select a slower Rep Rate B Immersion Delay Line Transducer Gaging Combination of water path delay line length plus material thickness to great for selected Rep Rate Select a slower Rep Rate ...

Страница 50: ...tion A TAC GATE Initially turned on A Scan not shown for clarity B Unsuccessfully gaging noisey material without TAC C Adding proper TAC to b with GATE DISPLAY switch in TAC position D Results of proper T GATE Sync with TAC in c GATE DISPLAY switch is now int the T position ...

Страница 51: ...procedure allows improvements in resolving power where the IF echo is too high in relationship to a small first back surface echo 6 4 2 T GATE START STOP Switches for Contract Transducer Gaging 6 4 2 1 General The two START STOP switch positions prescribed in Table II for the contact transducer mode should be adequate for typical gaging applications If for some reason such as non typical gaging ap...

Страница 52: ...pical echo polarities during delay line transducer gaging are inverted or reversed from those normally associated with immersion transducer gaging See Figure 25 These polarity inversions are caused by the differences in the acoustic impedances experienced by the ultrasonic pulses as they travel through the different transducer types and coupling media Because of these polarity inversions it is nec...

Страница 53: ...ity second half cycle of back surface echo The first smaller negative half cycle would not be the most suitable or stable half cycle to use due to the fact that it is close to the same amplitude as the second negative half cycle thereby creating a condition where potential exists to false trigger between the two If the above echo happend to be INVERTED then the appropriate half cycle to use would ...

Страница 54: ...trol If the third half cycle is improperly selected for T Gate start then the thickness readout will probably not be as stable because the T Gate may sometimes false trigger on the small amplitude leading half cycle If the small leading half cycle of the IF echo can be successfully suppressed at all times with the RECEIVER REJECT or GAIN controls the largest third half cycle can be considered a ca...

Страница 55: ... second half cycle is selected regardless of polarity because it has a higher amplitude than the actual first half cycle The amplitude of the small first positive half cycle depends on the impedance reflectivity of the material being measured T GATE STOP switch set to NEG in this example to Sync on the two higher amplitude negative half cycles for multiple echo gaging Typical for immersion or bubb...

Страница 56: ...s an adequate amplitude to create a reliable sync 6 4 5 HI RES NORM Switch The NovaScope allows the selection of either normal or exceptionally high resolving power via the left sidepanel HI RES NORM switch for only those interface gating applications using a delay line or immersion transducer where plastic thickness is being gaged between the interface echo and the first back surface echo This sw...

Страница 57: ...rther adjustment g Always re calibrate whenever changing the echo period over which the T Gate operates except where no errors result when gaging on multiples with either delay line or immersion transducers 7 2 THICKNESS CALIBRATION WITH VELOCITY If the ultrasonic velocity for the material to be gaged is accurately known set the THICKNESS VELOCITY switch in the VELOCITY position and adjust it unti...

Страница 58: ...ed whose thickness falls within the anticipated thickness range c Be certain that the THICKNESS VELOCITY switch is set in the THICKNESS position d Set the Alarms function switch to the function desired either LO HI or LO HI e Couple the transducer to the material described in Section 7 4 2 7 4 1 To Calibrate Only the LO Control With the transducer coupled to the material initially adjust the CAL c...

Страница 59: ... standard for each alloy of similar composition This is true for many groups of steels aluminum alloys and magnesium alloys especially if optimum gaging precision is not needed There are noticeable ultrasonic velocity differences even between similar alloys or heat treat conditions which can lead to small calibration errors Experimentation is necessary to establish what liberties can be taken in t...

Страница 60: ...re 28 Table V and information on the NovaScope rear panel The NovaScope may be damaged if operated with the wrong AC line voltage applied TABLE V Rear Panel Electrical Information For Voltage Selector Switch Fuse And Power Cord Receptacle Fuse 250 V Fuse 250 V Line Voltage Acceptable Line UL 198 6 3AG IEC 127 Voltage Range 1 4 x 1 4 5 x 20mm 115 VAC 95 128 VAC 2 0 A slow 1 6 A slow T 230 VAC 190 2...

Страница 61: ...or future application expansion VGA is for external VGA use remember this is for the graphics screen view only Touch Screen is active on front panel only This is also provided for future application expansion NovaScope 5000 Rear Panel View FIGURE 28 NovaScope Rear Panel Photo Line Fuse And Power Cord Receptacle ...

Страница 62: ... of its local offices representatives or delerships Once the proper AC LINE FUSE Section 11 3 inspections have been performed the detachable AC line power cord can now be attached as follows 11 4 1 Attachment To NovaScope Insert the female connector on the power cord into the appropriate receptacle on the rear panel of the NovaScope see Figure 28 The NovaScope has a three wire power cord with a th...

Страница 63: ...t for the source voltage to be used c Fuse type verified d Power cord attached into the NovaScope s receptacle e Adequate ventilation ensured around the instrument f Power cord plugged into the appropriate power source outlet that has a properly grounded protective ground contact Now turn on the NovaScope by pressing in the POWER switch Observe that the graphic display illuminates and the system b...

Страница 64: ...n range The dynamic range of the OFFSET control is equal to the maximum thickness limit on the READOUT RANGE switch position selected 12 2 IP SYNC Output SMB connector for internal IP initial pulse main bang trigger output It can be used to sync peripheral instrumentation to the NovaScope IP including other NovaScopes see Section 12 3 The output electrical specifications for the IP SYNC OUTPUT are...

Страница 65: ...mportant Notice The VELOCITY function on the front panel THICKNESS VELOCITY Switch is not useable inoperative when the NovaScope is being slaved via its EXT PRF mode Therefore if calibration is to be performed by entering a known velocity value temporarily switch the NovaScope to one of its own Pulse Rate values so it s operating on its own built in PRF sync and then enter the velocity value Once ...

Страница 66: ...sed to derive the virtual LED thickness readout on the front panel of the NovaScope The virtual LED display which updates approximately 10 times per second which is a suitable speed for visual observation obtains its input as averaged high speed binary accomplished in conjunction with the micro processor 12 4 2 RS 232C Interface 12 4 2 1 General The DATA connector provides an RS 232C bidirectional...

Страница 67: ... SPEED BINARY 6 S Q Bit 7 Low 0 Grd 0V 19 S Q Bit 6 High 1 5V 7 S Q Bit 5 20 S Q Bit 4 8 S Q Bit 3 21 S Q Bit 2 9 S Q Bit 1 22 S Q Bit 0 LSB 15 S Q Spare Pin 23 S Q RS 232C Out 11 S Q RS 232 In 12 S Q CTS Clear To Send RS 232C 14 S Q Print Command 13 S Q HI Alarm ALARMS 25 S Q LO Alarm Off 0V On 5V 24 S Q HI LO Alarm Combination Open Collectors With 5 7 K Ohm Pull up Resistors 10 S Q Range Short O...

Страница 68: ...ote that the information format for digital printers contains the actual measurement units in in us mm mm us The word overrange is printed whenever the thickness value T Gate exceeds that specified on the front panel range switch 12 4 2 4 Computer Interfacing Figures 32 and 33 show the digital format and interface connection respectively between a typical computer and the NovaScope while Figure 34...

Страница 69: ...Manual No OM5000 Jan X 04 Ver 1 40 63 FIGURE 30 RS 232C Format For Serial Printers ...

Страница 70: ...Manual No OM5000 Jan X 04 Ver 1 40 64 FIGURE 31 Typical RS 232C Interconnect Between NovaScope 5000 And Serial Printer ...

Страница 71: ...Manual No OM5000 Jan X 04 Ver 1 40 65 FIGURE 32 RS 232C Format For Computers ...

Страница 72: ...Manual No OM5000 Jan X 04 Ver 1 40 66 FIGURE 33 RS 232C Interconnect Between The NovaScope 5000 And A PC Or IBM Compatible Computer ...

Страница 73: ...n the system it is better to permit the computer s software to set alarm levels etc based on the digital thickness information from the NovaScope s DATA port 12 4 4 PortaScan RANGE UNITS Output Referring to Figure 29 RANGE Pin 10 and UNITS Pin 2 are special outputs 0 5 volt used in conjunction with the high speed binary NovaScope Computer interface for the PortaScan imaging system Both outputs are...

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