Echo evaluation with | Epson USN 52L, USN 52R instruction

Echo evaluation with DAC/TCG	Operation

5.6Echo evaluation with

DAC/TCG

To be able to evaluate a flaw indication by means of the DAC/TCG, certain requirements have to be met:

•The Distance-Amplitude Curve must already be recorded.

•It only applies to the same probe that was used for recording the curve. Not even another probe of the same type must be used!

•The curve and the DAC/TCG only apply to the material that corresponds with the material of the reference block.

•All functions affecting the echo amplitude must be set as they were during recording of the curve. This especially applies to the following functions:

DAMPING, FREQ.,RECTIF., MTL VEL, PULSER and REJECT.

•TOF is set to PEAK.

•AMPLITUDE is set to dB THRESHOLD.

•Choose the echo amplitude (as dB difference to the curve) using the TV -keys for an enlarged representation in the A-scan.

Krautkramer USN 52R/USN 52L

Issue 05, 02/00

5-31

Image 76

Epson USN 52L Echo evaluation with, DAMPING, FREQ.,RECTIF., MTL VEL, Pulser and Reject, Amplitude is set to dB Threshold

Contents

USN 52R / USN 52L Technical Reference and Operating Manual Introduction Index Basics of operation Function overview Recording a Distance-Amplitude Configuring the USN 52R/USN 52LStoring measured values Data Logger Printing instrument settings Printing display contents and instrumentDocumentation with the PC program Interfaces 10-7 10-210-8 Issue 05, 02/00 Krautkramer USN 52R/USN 52L Introduction Safety information Defects/errors and exceptional stressesIntroduction Storage batteries Important notes Preconditions for testing with ultrasonic flaw detectorsSoftware Operator training Technical test requirements Wall thickness measurements with ultrasonics Limits of testingEffect of the material of the test object Assessing flaws using ultrasonics Effect of temperature variationsMeasurement of remaining wall thickness Flaw boundary scanning method Echo display comparison method Special features of the two versions USN 52R/USN 52LUSN 52R USN 52L Introduction Getting to know the adjustment functions ServiceSpecifications and basic settings Remarks on this manual Layout of this manual Descriptions of functionsOperating steps Keys Issue 05, 02/00 Krautkramer USN 52R/USN 52L Standard package and accessories Standard package and accessories Standard package Product type Description Recommended accessories Required accessoriesProduct type Description Order no Recommended outside products GCH1 Issue 05, 02/00 Krautkramer USN 52R/USN 52L Setting into operation Setting into operation Power supplyPositioning the USN 52R/ USN 52L Setting into operation Battery operation Inserting the batteriesAAttention Nickel Cadmium NiCd Left Alkaline Alk Right LED Using the battery chargerStatus Switching on Probe connection Starting the USN 52 R Reset Screen saver Basics of operation USN 52R and USN 52L Basics of operation USN 52L Display Scan display Functions on the display Measurement line Indications beneath the A-scanAngle and X-VALUE Status line Menu line Function keys KeypadSpecial keys Special keys of the USN 52L for setting the display Setting the function Accelerated adjustmentOperational concept Changing the operating levels Function keys Selection of measured value for enlarged display Keys for special functions Only USN 52L Important basic settings Setting the measurement unitsSet language Operation Issue 05, 02/00 Krautkramer USN 52R/USN 52L Operation Function overview first operating level Operation Gain Gain adjustment Adjustment of the USN 52R/ USN 52LSetting the dB Step Range Calibration range Selection of basic dataCoarse in steps MTL VEL Setting the sound velocity Delay Setting the delay Setting the receiver FREQ. Frequency RECTIF. Setting the rectification mode Damping Electrical damping of the probe Setting the pulser Pulser Changeover of initial pulse REP-RATEset the required percentage value with M Gate adjustment Start Start Start of the gate Thresh Determination of thresholdWidth Width of the gate Calibration functions Start Gate start Adjustment of the freely selected value Zero Probe delayMTL VEL Sound velocity Data set names and Memo mode in .10 on Recall Loading of a stored settingStoring data Clearing the instrument setting Store Storing the instrument settingsSET# Selection of data set Clearing all data Displaying stored A-Scans preview USN 52R/USN 52L calibration Calibration of display range Calibration with a straight-beam probe Straight-beam probe with delay Known sound velocity Calibration with angle-beam probesUnknown sound velocity Path error Flank modeCalibration with a dual T/R probe Automatic calibration Higher sound velocity Preconditions Preparing the instrument for digital measurementGate Logic Calibrating the sensitivity B Recall of dB difference Set Amplitude to dB Threshold DAC/TCG DAC/TCG mode Function group TCG Operation Recording a Distance- Amplitude Curve Operation Operation DAMPING, FREQ.,RECTIF., MTL VEL, Pulser and Reject Echo evaluation withAmplitude is set to dB Threshold DAC mode TCG mode Preparations Measuring thicknessMeasuring the thickness Determining the number of Files Storing measured values Data LoggerNumber of measurement locations = 2500 Number of Files Selecting a File File Mode Thickness Copy Mode Datalogger Measure Clearing FilesStoring measured values File Number Viewing stored readings ErrorClearing the measured values Configuring the USN 52R/ USN 52L Left Table Left function group Center Table Value Diam Right Table MEAS.UNITS Graticule Display graticule Amplitude Amplitude display Intensity Display brightness only USN 52R Freeze Mode Storage modeHigh LOW DB Step Sets step range Gate Logic Setting the gate logic File Number Selecting a file Location Selecting the measurement location Value Displaying the measured value File Mode Enabling the Data LoggerClearing the measured value Language Setting the display language MEAS. Units Setting the measurement units Data set names Data set namesMemo function Data SET Name Entry of a data set name Data SET Direc Data set directory Memo Storing additional information Entering texts Filling in a data header Data set names Issue 05, 02/00 Krautkramer USN 52R/USN 52L Setting the RS232 interface Baud Rate Setting the transfer speedLength Setting the length of a byte Parity Parity check Copy Mode Setting data communication Printer typeHard Copy Mode Setting the flaw location calculation Thickness Material thickness Angle Angle of incidenceValue X-value of the probe Diam Test object diameter Displaying the measured values Setting the measurement methods Measure Method of measurement for sound path measurement TOF Measurement mode for time of flight Function check Locking set valuesAuxiliary devices Power supply Range Suppression Reject Damping Rectification Gate threshold Thickness measurement Issue 05, 02/00 Krautkramer USN 52R/USN 52L Documentation Printing instrument settings and display contents Copy Mode Documentation Documentation with the PC program UltraDOC Issue 05, 02/00 Krautkramer USN 52R/USN 52L Servicing and maintenance Cleaning the USN 52R/ USN 52L Maintenance of NiCd cellsServicing and maintenance Charging NiCd cells Handling NiCd cells Handling AlMn batteries Issue 05, 02/00 Krautkramer USN 52R/USN 52L Interfaces, Peripherals Interfaces, Peripherals InterfacesSerial interface RS Interfaces, Peripherals Layout of 7 pin Lemo socket RS Layout of 4 pin Lemo socket charger socket, switching output Connection of a peripheral Baud Rate Transferring the display contents Printing Data Logger report Operation Set Copy Mode to Report Data Logger report format Interfaces, Peripherals Transferring measurement values Transferring measurements values in the Data Logger to a PC Printing display contents and instrument settings Transfer formats Byte-No Data Format X.XXX USN 52R/USN 52L remote operation Esccodereturn Interfaces, Peripherals Delay Length Store Configuring the Memo function Sequence of commands of the Memo codeDefining data header Number of fields Example for a header definition Eschn 9RETURN Entering Memo text Analog outputs Lemo RF mode Analog voltage for the sound path of an echoRectified echoes Measure = 0 to 1st TTL switching output Specifications Specifications Measurement resolution Echo height resolutionDisplay rectification Frequency -3dB ranges DAC/TCG Storage temperature Operating temperatureBattery mode Probe connectors Issue 05, 02/00 Krautkramer USN 52R/USN 52L Appendix Function directory Appendix Curve TCG DAC Echo TCGDAC/TCG TCG Damping Rcvr Data SET MEM Data SET Preview MEMFREQ. Rcvr Gain MTL VEL Basic Pulser PulsRecall MEM RECTIF. Rcvr Reject Puls REP-RATE PulsStore MEM Velocity #1 EC Certificate of Conformity Krautkrämer GmbH & Co. oHG Service addressesFrance USA Japan 10-10 Issue 05, 02/00 Krautkramer USN 52R/USN 52L Changes Changes Index Copy Mode DAC 12-4 Issue 05, 02/00 Krautkramer USN 52R/USN 52L Parameter Dump 5-58, 6-3 Parity Reject Krautkramer USN 52R/USN 52L Issue 05, 02/00 12-7 Value Zero 5-13 Zoom key Option DGS Operating Manual R5 TCG/DGS R6 TCG/DGS L4 TCG/DGS L5 TCG/DGS Contents DGS-17DGS-29 DGS-6 DGS-4 Issue 02, 03/99 Krautkramer USN 52R/USN 52L Option DGS DGS-5 How to measure with the DGS DGS-7 Overview of the method of proceeding Overview of the DGS menu Switch from TCG to DGS mode DGS modeOverview of the DGS menu Function group DGS mode Menu functions Gain Function table DGS mode PROBE-# ATT-REF Page Operating the DGS Storing a new probe Operating the DGS Operating the DGS Preparing the DGS evaluation Diameter of the equivalent Operating the DGS Carrying out a DGS evaluation Or O Switching off the DGS mode Switching off the DGS mode Storing data Page Codes for remote control Codes for remote control ATT-REF DGS-32 Issue 02, 03/99 Krautkramer USN 5 /USN 52L Option DGS