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MITECH MFD500B, User Manual

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MITECH MFD500B User Manual Download Page 13

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displayed); the receiver is connected with right, the pulse is connected with left.

Select the probe model step:

1

Activate the PROBE submenu (located in the CAL menu) by pressing the menu key below it.

2

Select the function item titled PROBE.

3

To change the probe mode, turn the knob. Each available probe mode is represented by an icon

on screen display whenever that probe mode is indicated.

4

The probe mode will be set to the last one displayed.

4.5 Selecting a Rectification Mode

You can select the rectification mode of the echo pulses according to your application in the function

RECTIFY (BASIC→ECHO→RECTIFY).
Rectification affects the orientation of the A-Scan on the display screen. The A-Scan represents the

pulse (echo) that’s returned from the material being tested to the instrument. The series of echoes looks

like the Radio Frequency (RF) signal.

Note that the RF signal has a negative

component below the axis, and a positive

component above the axis.

RF rectification is useful when evaluating a

probe.

RF rectification is forbidden when displaying

the DAC/AVG curves.

Positive Half Rectification means that only

the upper (positive) half of the RF signal is

displayed.

Negative Half Rectification means that only

the bottom (negative) half of the RF signal is

displayed. In the figure above, note that

even though it’s the negative half of the RF

signal, it’s displayed in the same orientation

as a positive component. This is only to

simplify viewing. The signal displayed in the

view identified as Negative Rectification is

the negative component of the RF signal.

Full-Wave

Rectification

combines

the

positive and negative rectified signals

together, and displays both of them in a

positive orientation. Full-wave rectification is

recommended for most inspections.

Use the following procedure to select a rectification mode

1

Activate the ECHO submenu (located in the BASIC menu) by pressing the menu key below it.

Summary of Contents for MFD500B

Page 1: ...MITECH ULTRASONIC FLAW DETECTOR MFD500B User s Manual MITECH CO LTD www mitech ndt com ...

Page 2: ...elay 10 4 4 Selecting the Probe Test Mode 11 4 5 Selecting a Rectification Mode 11 4 6 Setting the A Scan Reject Level 11 4 7 Setting the Gain 12 4 8 Changing the Gain Adjustment Increment DB STEP 13 4 9 Auto Gain Feature 13 4 10 Configuring the Gates 13 4 11 Setting the Damping Level 14 4 12 Setting the Pulse Energy Level 14 4 13 Setting the Pulse Width 17 4 14 Adjusting the Pulse Repetition Freq...

Page 3: ...nd Angle Beam Probes 21 5 2 Calibration with Dual Element TR Probes 23 5 3 Distance Amplitude Curve 23 5 4 Measuring with DGS AVG 26 5 5 Curved Surface Correction 28 5 6 AWS D1 1 Weld Rating Feature 28 5 7 Crack Height Measuring Feature 28 5 8 Envelope Function 29 5 9 Peak Hold Feature 29 5 10 B Scan Feature 30 5 11 Weld Figure Feature 30 5 12 Coded Echo color 30 5 13 Data Storage 32 6 Maintenance...

Page 4: ...nts 3 High performance security battery module is easy to assemble and disassemble the instrument can work continuously more than eight hours Display Hi resolution 320 240 pixels full digital TFT LCD with adjustable brightness it is capable of providing high contrast viewing of the waveform from bright direct sunlight to complete darkness The hi resolution TFT LCD display with fast 60 Hz update gi...

Page 5: ...eld Figure Feature Magnify Gate spreading of the gate range over the entire screen width Video Recording and Play Auto gain Function Envelope Simultaneous display of live A scan at 60 Hz update rate and envelope of A scan display Peak Hold Compare frozen peak waveform to live A Scans to easily interpret test results A Scan Freeze Display freeze holds waveform and sound path data B Scan display fea...

Page 6: ...rall Dimensions 263H 170W 61D mm Relative Humidity 20 95 RH Power Supply DC 9V Operating Temperature 10 to 50 Storage Temperature 30 to 50 1 3 Instrument Standard Configuration No Item Qty Remarks Standard config 1 Main unit 1 with full digital TFT LCD Display 2 Straight Beam Probe 1 4 MHz Φ10 3 Angle Beam Probe 1 4 MHz 8 mm 9 mm 60 4 Probe Cable 1 Q9 C5 or optional C9 C5 5 Battery Module 1 8 8 am...

Page 7: ...of range settings and measured values On the first status line Echo height is displayed as 24 5 It means that the peak echo height inside the current selected gate is 24 5 FSH Full Screen Height of the wave area Flaw size value means ERS Equivalent Reflector Size of the reflector signal inside the current selected gate It is displayed after the AVG curve is switched on When the DAC curve is on thi...

Page 8: ...selected gate is gate A sound path 24 0 mm The names of the menus or submenus are displayed at the bottom of the screen The selected menu or submenu is highlighted Indicated at the right of the display next to the A Scan are the functions of the corresponding menu The status area at the bottom right corner shows the system status The following status will be showed Indicates the battery capacity S...

Page 9: ...nd fast operating in difficult inspection environments Functions of the keys Home key immediately returns the instrument to the main screen full screen Freeze key freezes the A Scan Magnify key expands the gate range to full screen For turning the instrument On Off Db Step key selects the gain submenus or switch the db step A B Gate key Gate functions selecting gate functions and Gate A B switch R...

Page 10: ...ed the functions contained in that submenu are listed in the Function Bar down the right hand side of the display screen Functions are then selected by pressing and Turning the Function Knob will change the value shown in the selected function s box Note that some functions like RANGE have both coarse and fine adjustment modes There are three steps in the fine adjustment mode Coarse and fine modes...

Page 11: ...talled probe The Instrument will operate with one or two single element probes or with a dual element probe To install a single element probe connect the probe cable to either of the two ports on the front of the instrument When two probes or a dual element probe is connected to the instrument the Receive probe connector should be installed in the right port and the Transmit probe connector in the...

Page 12: ...he surface of the test object or in a section of the test object starting at a later point This allows you to shift the complete screen display and consequently also the display zero If the display should for example start from the surface of the test object the value in D DELAY must be set to 0 To set the display delay 1 Activate the BASE submenu located in the BASIC menu by pressing the menu key...

Page 13: ...signal Note that the RF signal has a negative component below the axis and a positive component above the axis RF rectification is useful when evaluating a probe RF rectification is forbidden when displaying the DAC AVG curves Positive Half Rectification means that only the upper positive half of the RF signal is displayed Negative Half Rectification means that only the bottom negative half of the...

Page 14: ...ection gain are also displayed on the top right corner of the screen The maximum of the total gain the basic gain plus the offset gain plus the correction gain is 110 dB The offset gain is for the purpose of flaw evaluation The DAC AVG curves remain unchanged when adjusting the offset gain Sensitivity correction gain Compensate for the transfer losses in the material under test This correction gai...

Page 15: ...poses of flaw detection and material thickness evaluation When the signal crosses the A or B Gate the maximum point peak of the signal in the specific gate is used for evaluation purposes The measured value is indicated on the status line Selecting a Gate Selecting a gate by using the GATE SEL function in the GATE submenu You can also repeatedly press A B to switch the selected gate between Gate A...

Page 16: ...etting a Gate s Threshold Vertical Position You can determine the threshold value of the gates within the range of 0 to 99 FSH Full Screen Height for triggering the LED alarm if this value is exceeded or not reached depending on the setting of the LOGIC function 1 Activate the GATE submenu located in the BASIC menu 2 Select the gate to be positioned using the GATE SEL function 3 Select the THRESH ...

Page 17: ... following procedure to turn the horn off or on 1 Activate the LOGIC submenu located in the BASIC menu by pressing the menu key below it 2 Select the ALARM function and turn the audible alarm ON or OFF Setting the Gate Work Mode Two options for the gate work mode SINGLE and E E SINGLE measures the distance from the work piece surface to the peak echo inside the selected gate E E Echo Echo mode mea...

Page 18: ... The function is no available in this model 4 14 Adjusting the Pulse Repetition Frequency PRF The pulse repetition frequency indicates the number of times an initial pulse is triggered per second You can determine whether you need the highest possible PRF value or whether you are satisfied with a low value The PRF value ranges from 10 Hz to 1000 KHz The larger your work piece the smaller PRF value...

Page 19: ...the flaw position The angle of incidence for the straight beam probe is fixed to 0 Adjustment range 0 80 4 20 Magnifying the Contents of a Gate Whenever an A Scan is active pressing the key enlarges the displayed portion of the A Scan contained in the selected gate Any of the available gates may be specified as the selected gate The width of the magnified gate determines the level of magnification...

Page 20: ...measurement will be set to the choice last displayed 4 24 Scale Setting As an alternative to the measured values the instrument enables to display a scale on the first status line The scale gives you an overview of the position of echoes The following settings are possible S PATH Display of sound path scale P VALUE Display of projection distance scale DEPTH Display of depth distance scale Select t...

Page 21: ... turn the knob 4 The A Scan echo will remain the color last displayed 4 29 Setting the Menu Color 1 Activate the LCD submenu located in the CFG menu by pressing the menu key below it 2 Select the function titled MNU COLOR There are ten color options 3 To change the menu s color turn the knob 4 The menu will remain the color last displayed 4 30 Key Sound The key sound can be turned on off using the...

Page 22: ...with the instrument via the USB port A Scan display instrument settings and videos stored in the memory of the instrument can be transferred to the computer through the USB port Detailed information of the communication software and its usage refer to the DataPro software manual 5 Calibration and Measurement Before working with the instrument you have to calibrate the instrument you have to adjust...

Page 23: ...e screen Set the range so that the second calibration echo is located on the right edge of the screen 2 Select the function group PDELAY CAL PDELAY 3 Enter the distances of the two calibration echoes in S REF1 and S REF2 4 Position one gate on the first calibration echo 5 Position the other gate on the second calibration echo 6 Press key when CAL is selected to trigger the calibration The calibrat...

Page 24: ...all wall thicknesses the above described effect leads to an echo amplitude drop which has to be especially taken into account with thicknesses less than 2 mm A stepped reference block having different wall thicknesses is required for calibration The wall thicknesses must be selected so that they cover the expected readings Calibration Process We recommend to use the semiautomatic calibration funct...

Page 25: ...x appears on the top right corner of the display 3 Couple the probe to the first reference point and adjust the gate so that it is broken by the primary echo If necessary adjust the gain so that the echo crosses the gate and the highest peak in the gate is at approximately 80 of full screen height The highest peak must not be higher than 100 full screen height Note that you can press or to search ...

Page 26: ... REF selection The options include RL SL EL and ML The dB equivalent height of the signal above or below the corresponding DAC Reference Curve amplitude is displayed as a comparison result The comparison result is shown as right figure Note that the result is like RL 1 2 It means that the peak echo height inside selected gate is 1 2 dB offset to the DAC RL line Deleting a DAC Curve To delete a sto...

Page 27: ...nfluencing variables already mentioned there are other factors determining the curve shape sound attenuation transfer losses amplitude correction value probe and etc The following probe parameters affect the curve shape Element or crystal diameter Frequency Delay length Delay velocity You can adjust these parameters on the instrument in such a way that you can use the AVG method with many differen...

Page 28: ...gs Creating AVG Offset Curves When operating with AVG turned on three AVG curves including the AVG UL the AVG ML and the AVG DL are typically displayed The three curves can be offset by user inputted equivalent flaw size values in the AVG UL AVG ML and AVG DL selection The offset values will usually depend on the largest acceptable flaw size Deleting AVG Curve To delete stored AVG curve 1 With the...

Page 29: ... plan to carry out the flaw position calculation for the curved surface workpieces the CSC function should be turned on Otherwise turn off the CSC function 5 6 AWS D1 1 Weld Rating Feature This feature allows analysis of welds according to AWS specification D1 1 and provides a D1 1 rating The AWS D1 1 feature utilizes four AWS specified variables including INDICAT Gain in dB required to position a...

Page 30: ...ded reference simply repeat steps to 5 7 Crack Height Measuring Feature This feature allows measuring the height of a crack found inside the workpiece Before starting to use the Crack Height Measure function the instrument and the probe must be correctly calibrated 1 Activate the CRACK submenu locating in the FUNC menu by pressing the corresponding key below it 2 Position the selected gate over th...

Page 31: ...function item titled PEAK HOLD 3 To turn on off the Peak Hold function continue pressing the key or turn the knob Also you can repeatedly press PEAK HOLD to turn on off the PEAK HOLD function Note that PEAK HOLD and ENVELOPE can not function simultaneously 5 10 B Scan Feature In B SCAN mode the instrument displays a graphical cross section of the workpiece Use the following procedure to switch to ...

Page 32: ...press to trigger the weld figure function It will prompt out to input the distance from the weld center to the probe front Measure and input that value Finally press the key below OK Weld figure is displaying and a icon indicates the position of the flaw Press any key to exit from the weld figure display Note The weld figure feature apply only to angle beam transducers Probe parameters should be c...

Page 33: ...eady occupied It is not possible to overwrite an occupied file Users should select another file name which is still empty or clear the occupied file to save to To avoid loss of data e g in case of a software update you should save the file to a PC Wave RECALL You can recall a stored wave file your instrument will then display all the test relevant technical features that existed at the moment of t...

Page 34: ...to save these settings to current channel file you can carry out the channel STORE operation Channel CLEAR Channel files are cleared using this procedure 1 Activate the CHANNEL submenu located in the MEM menu by pressing the menu key below it 2 Select the function item titled FILE Turn the knob until the desired file name appears 3 Select the function item titled CLEAR Press key or turn the knob t...

Page 35: ...erating conditions the instrument is conditionally guaranteed to be free from defects in material and workmanship for a period of two years from date of shipment This warranty shall not apply to equipment subjected to misuse or abuse improper installation alteration neglect or accident Excluded from this warranty are expendable items such as transducers interconnecting cables and batteries This wa...

Page 36: ... being used for ultrasonic inspections the charging time is about 8 hours This charging time applies to ambient temperatures from 25 to 30 Please take into consideration that the batteries are not charged to their full capacity at higher temperatures The POWER LED display at the top right corner of the keypad indicates the status of the charging process It will flash red green during the charging ...

Page 37: ...METER OFFSET S REF2 COPY WAV COLOR DELETE REF TYPE T CORR CAL CLEAR MNU COLOR FINISH REF SIZE GATE GATE SEL ANGLE ANGLE AWS INDICAT V I D E O FILE H O R N KEY SOUND O F F S E T DAC RL OFF SET AVG UL START HL DIAM REFRNCE DAC SL AVG ML WIDTH HL DEPTH ATTEN RECALL DAC EL AVG DL THRESH CAL RATING CLEAR SIZE REF LOGIC GATE MODE PULSER DAMPING CRACK HEIGHT B S C A N B SCAN D E L DEL DAC DEL DEL AVG B L...

Page 38: ...online reporting to repair sheet In accordance with the international relevant regulations the following are not within the scope of free warranty Damage caused by man made or improper keeping Self dismantle or non special repair shop dismantle Do not follow the requirement of service registration or warranty expired Consumable parts Service Promise MITECH users have lifelong maintenance service F...

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