User`s Manual to Computer Program CALIBRAT: A Program
Contents
1. This report is the third of four reports which describes work done on Project 913 Development of an Absolute Calibration System for Nondestructive Testing Devices The study is being conducted at the Center for Geotechnical and Highway Materials Research the University of Texas at El Paso with the cooperation of the Texas State Department of Highways and Public Transportation Many people have contributed their help towards the completion ofthis report Thanks are extended to the University of Texas at El Paso Civil Engineering Department Secretarial staff and Mr Amin Solehjou for excellent work in preparing the electronics parts Invaluable comments and support were provided by Mr Robert Briggs Richard Rogers and all other personnel of SDHPT Vivek Tandon Soheil Nazarian August 1990 iii LIST OF REPORTS Research Report 913 1F Volume 1 Comprehensive Evaluation of Five Sensors Used for Pavement Monitoring by Vivek Tandon and Soheil Nazarian presents an extensive testing program to evaluate the accuracy and precision of five deflection sensing transducers used in pavement engineering for use by Texas State Department of Highways and Public Transportation August 1990 Research Report 913 1F Volume 2 An Absolute Calibration System for Nondestructive Testing Devices by Vivek Tandon and Soheil Nazarian presents a system developed for the absolute calibration system of the FWD and Dynaflect devices for use by the Te2. DYNAFLECT lt 2 gt FOR FWD lt 3 gt FOR OTHERS Option 1 selects the default values suitable for the calibration of the Dynaflect device While option 2 selects the default values suitable for the calibration of the FWD device If Option 1 or 2 is selected Steps 4 and 5 will be skipped However if Option 3 is selected Steps 4 and 5 will appear The default values for Option 3 Others are similar to that of the FWD device The following question will appear on the screen WOULD YOU LIKE TO HAVE EXTERNAL TRIGGER Y N STEP 5 STEP 6 STEP 7 3 If Y is selected the A D board will be activated using the external trigger provided by the SCU for data collection otherwise if N is selected the data collection process will start immediately See Step 11 The nature of load applied to the pavement is defined in response to the following question PLEASE ENTER THE TYPE OF LOAD IMPARTED lt 1 gt STEADY STATE SINUSOIDAL LOADING lt 2 gt IMPULSE LOADING If option 1 is selected the imparted load by the device will be assumed to be sinusoidal Conversely if Option 2 is selected the load will be assumed to be an impulse loading Once the type of load is selected the default values used by the program will be shown on the screen The default values can be seen in Table 1 Basically the total number of channels number of geophones number of load cells are set based upon the calibration system developed If any other
3. Data Translation Inc Version 1 11 DIG LIB and VIG LIB graphics library Microsoft FORTRAN Version 4 1 Libraries ATLDEFS FOR The file has information about the board and the board is initialized and identified by the definitions available in this file ATLERRS FOR the errors detected by the board are displayed on the screen with the help of this file CALIBRAT FOR this program CALIBRAT BAT this file is used to compile the program and is included in Appendix A For compiling the program the COMPILE command should be typed at the DOS prompt 1 3 EXECUTION OF PROGRAM The program can be started by typing CALIBRAT at the DOS prompt The execution of the program is described in the following steps STEP 1 STEP 2 STEP 3 STEP 4 The following message will appear on the screen WELCOME to CALIBRATION PROGRAM PRESS ENTER TO CONTINUE At this point user should use the enter key to proceed The following message will appear on the screen TO STOP EXECUTION AT ANY TIME PLEASE ENTER 99 PLEASE CHOOSE ONE OPTION lt C gt COLLECT AND REDUCE DATA lt R gt REDUCE COLLECTED DATA One of the two options should be selected If Option C is selected the program will resume to the next step However if Option R is selected the program will skip Steps 3 through 12 The type of machine needed to be calibrated can be selected by answering the following question WHICH DEVICE DO YOU WANT TO CALIBRATE lt 1 gt FOR
4. IS READY TO COLLECT THE DATA INPUT THE NAME OF OUTPUT FILE TEMP TEMP ALREADY EXISTS DO YOU WANT TO OVERWRITE Y N 11 2 INPUT THE NAME OF OUTPUT FILE TEMP1 HIT ENTER TO BEGIN ACQUISITION lt CR gt PLEASE WAIT WHILE DATA IS COLLECTED 5 6 5 59 0 0 0 8 0 0 0 2 9 2 0 0 9 0 0 9 0 0 6 0 0 0 0 0 9 0 0 6 0 0 0 8 0 9 0 9 8 8 0 0 5 2 8 9 0 0 8 0 0 8 0 0 0 0 DATE ON WHICH DATA COLLECTED 05 08 1990 30 0 0 8 0 0 5 0 6 9 2 9 0 2 0 8 85 9 0 0 8 9 8 0 045 0 6 8 3 8 9 4 8 2 9 5 0 9 2 02 9 5 0 0 2 5 0 0 0 9 8 0 0 2 2 0 6 9 TOTAL NUMBER OF CHANNELS NUMBER OF GEOPHONES NUMBER OF LOAD CELLS NUMBER OF OTHER DEVICES O Y ro a CHANNEL DESCRIPTION CHANNEL GAIN ID NAME 1 1 G1 GEO 1 2 1 G2 GEO 2 3 1 L1 LCEL 1 4 1 L2 LCEL 2 5 1 L3 LCEL 3 4495 9 0 9 9 9 9 9 9 9 0 8 0 0 0 0 0 0 0 0 0 0 0 0 9 0 0 0 0 0 0 0 0 8 8 0 0 0 0 0 0 0 8 9 0 0 0 0 0 0 8 8 0 0 09 0 TIME SPAN FOR COLLECTING DATA SECONDS 250 DATA POINTS PER CHANNEL 512 PRESS ENTER CONTINUE lt CR gt DEFLECTION FROM GEOPHONE G1 27 29 MILS PEAK DEFLECTION FROM GEOPHONE 63 18 29 MILS LOAD FROM LOAD CELL L1 2345 Ibs LOAD FROM LOAD CELL L2 1800 Ibs LOAD FROM LOAD CELL L3 2400 Ibs PRESS ENTER TO CONTINUE THIS PROGRAM HAS A CURSOR TO FIND THE COORDINATES OF ANY POINT ON THE GRAPH 1 CHOOSE ONE OF THE P
5. lt 1 gt STEADY STATE SINUSOIDAL LOADING lt 2 gt IMPULSE LOADING reee HE DEFAULT VALUES ARE mor rrer peer eee BRLELEBRLLELEBLOERDEBYBDL BELL EL _ _ _ _____ _ __ ____ ____ __ TOTAL NUMBER OF CHANNELS NUMBER OF GEOPHONES NUMBER OF LOAD CELLS NUMBER OF OTHER DEVICES O C ro Cn CHANNEL DESCRIPTION CHANNEL GAIN ID NAME 1 1 G1 GEO 1 2 1 G2 GEO 2 3 1 1 LCEL 1 4 1 2 LCEL 2 5 1 L3 LCEL 3 17 TIME SPAN FOR COLLECTING DATA SECONDS 1250 DATA POINTS PER CHANNEL 256 DO YOU WANT TO CHANGE DEFAULT VALUES Y N DO YOU WANT TO READ DEFAULT VALUES FROM A FILE Y N WHAT VALUES DO YOU WANT TO CHANGE lt T gt OTAL NUMBER OF CHANNELS lt D gt ESCRIPTION OF CHANNELS lt S gt TIME SPAN FOR COLLECTING DATA lt N gt UMBER OF DATA POINTS lt A gt LL VALUES ENTER NUMBER OF GEOPHONES ENTER NUMBER OF LOAD CELLS ENTER NUMBER OF OTHER DEVICES ENTER DESIRED CHANNEL FOR GEOPHONE NUMBER 1 1 ENTER DESIRED GAIN 1 10 1 ENTER CHANNEL NAME 20 CHAR MAX GEOPHON1 ENTER DESIRED CHANNEL FOR GEOPHONE NUMBER 2 2 ENTER DESIRED GAIN 1 10 1 ENTER CHANNEL NAME 20 CHAR MAX GEOPHON2 ENTER DESIRED CHANNEL FOR LOAD CELL NUMBER 1 2 TWO CHANNELS ARE CONNECTED TO SAME DEVICE REVISE THE CHANNEL NUMBER ENTER DESIRED CHANNEL FOR LOAD CELL NUMBER 1 3 ENTER DESIRED GAIN 1 10 1 ENTER CHANNEL NAME 20 CHAR MAX LOAD1 ENTER DESIRED CHANNEL FOR OTHER DEVICE 1 4 ENTER DESIRED GAIN 1 10 1 ENTER CHANN
6. BER OF LOAD CELLS 3 NUMBER OF OTHER DEVICE 0 CHANNEL DESCRIPTION CHANNEL GAIN ID NAME 1 1 G1 GEO 1 2 1 G2 GEO 2 3 1 L1 LCEL 1 4 1 L2 LCEL 2 5 1 L3 LCEL 3 TIME SPAN FOR COLLECTING DATA SECONDS 1250 DATA POINTS PER CHANNEL 256 10 lt gt lt 0 250 512 DO YOU WANT TO CHANGE DEFAULT VALUES Y N DO YOU WANT TO READ DEFAULT VALUES FROM A FILE Y N WHAT VALUES DO YOU WANT TO CHANGE S TIME SPAN FOR COLLECTING DATA lt N gt UMBER OF DATA POINTS A LL VALUES FOR FWD DEVICE TIME SPAN SHOULD BE 20 125 Sec DO YOU STILL WANT TO CHANGE IT Y N THE TIME SPAN SHOULD BE IN MULTIPLES OF 0 125 Sec ENTER TIME SPAN FOR COLLECTING DATA Sec ENTER THE DESIRED NO OF DATA POINTS PER CHANNEL 256 512 1024 664348 080480948662449 44481443423414349442922404280405983094434 rr HE NEW VALUES ARE xxx rre ERR 4144559884854434838406498383848884982809HM4861 883 880444498044 TOTAL NUMBER OF CHANNELS NUMBER OF GEOPHONES NUMBER OF LOAD CELLS NUMBER OF OTHER DEVICES OWN nN CHANNEL DESCRIPTION CHANNEL GAIN ID NAME 1 1 G1 GEO 1 2 1 G2 GEO2 3 1 L1 LCEL 1 4 1 L2 LCEL 2 5 1 L3 LCEL 3 TIME SPAN FOR COLLECTING DATA SECONDS 250 DATA POINTS PER CHANNEL 2512 DO YOU WANT TO CHANGE DEFAULT VALUES Y N N DO YOU LIKE TO SAVE CHANGED VALUES IN A FiLE Y N Y INPUT FILE NAME FOR NEW DEFAULT VALUES TEMP DAT TEMP DAT ALREADY EXISTS DO YOU WANT TO OVERWRITE Y N Y NOW BOARD
7. EA AREA a mm millimetres squared 0 0016 square Inches Int Int square inches 6452 comimetrasaquared m metres squared 10 784 square feet fe w square fest 0 0929 metres squared 2 kilometres squared 0 39 square miles mi square yards 0 836 metres squared m ha hectores 10 000 2 53 acres ac mit square miles 2 59 kitometres squared km ac acres 0 395 hectares ha z MASS welght T 0 grams 0 0353 ounces or MASS welght 2 kg kilograms 2 205 pounds Ib megagrams 1 000 kg 1 103 short tons T ounces 28 35 grams 9 lb pounds 0 454 kilograms kg 2 T short tons 2000 Ib 0 907 megagrams Mg VOLUME mL mittititres 0 034 fluid ounces f oz i L litros 0 264 gallons ga VOLUME mt metres cubed 35 315 Cubic feet te m metres cubed 1 308 cubic yards yd fi oz fluid ounces 2957 milittitres mL gal galions 3 785 litres L ff feet 0 0328 ietres cubed m z TEMPERATURE exact cubic yards 0 0765 metres cubed m e esi 3 sius 9 5 then ahrenhelt oF NOTE Volumes greater than 1000 L shall be shown In m temperature add 32 temperature e 32 96 6 212 TEMPERATURE exact PIU 3 40 20 0 20 80 100 Fahrenheit 5 9 anor Colslus A A temperature subtracting 32 temperature These factors conform to the requirement of FHWA Order 5190 1A SI Is the symbol for the International System of Measurements PREFACE
8. EL NAME 20 CHAR MAX OTHER1 ENTER THE ID OF GEOPHONE NUMBER 1 3 CHAR MAX G1 ENTER THE ID OF GEOPHONE NUMBER 2 3 CHAR MAX G3 18 4 5 799 L4 2345 O1 5 67 125 512 ENTER THE NATURAL FREQUENCY IN Hz FOR GEOPHONE G3 ENTER THE DAMPING RATIO IN DECIMAL FOR GEOPHONE G3 ENTER THE TRANSDUCTIVITY FOR GEOPHONE G3 VOLTS in Sec ENTER THE ID OF LOAD CELL NUMBER 1 3 CHAR MAX ENTER THE CALIBRATION FACTOR IN mV ibs FOR L4 ENTER THE D OF OTHER DEVICE 1 3 CHAR MAX ENTER THE CALIBRATION FACTOR FOR OTHER DEVICE O1 ENTER TIME SPAN FOR COLLECTING DATA Sec ENTER THE DESIRED NO OF DATA POINTS PER CHANNEL 256 512 1024 9 2 0 0 05 2 0 0 0 9 0 0 0 9 5 8 0 0 2 5 8 8 8 0 G 04 5 0 0 0 0 9 0 8 0 0 0 5 2 0 2 9 0 9 0 0 8 0 6 9 8 4 8 rr rro rre THE NEW VALUES ARE _ __ _ __ ____ _ ___ ______________ _ __________ TOTAL NUMBER OF CHANNELS 4 NUMBER OF 5 2 NUMBER OF LOAD CELLS 1 NUMBER OF OTHER DEVICES 1 CHANNEL DESCRIPTION CHANNEL GAIN ID NAME 1 1 G1 GEOPHON1 2 1 G3 GEOPHON2 3 1 L4 LOAD1 4 1 01 OTHER1 TIME SPAN FOR COLLECTING DATA SECONDS 125 DATA POINTS PER CHANNEL 512 DO YOU WANT TO CHANGE DEFAULT VALUES Y N N DO YOU LIKE TO SAVE CHANGED VALUES IN A FILE Y N Y INPUT FILE NAME FOR NEW DEFAULT VALUES TEMP DAT TEMP DAT ALREADY EXISTS DO YOU WANT TO OVERWRITE Y N Y INPUT THE NAME OF OUTPUT FILE TEMP TEMP ALREADY EXISTS DO YO
9. F CHANNEL NUMBER 2 lt 7 gt REDUCED DATA OF CHANNEL NUMBER 3 lt 8 gt REDUCED DATA OF CHANNEL NUMBER 4 lt 17 gt DEVIATION FROM AVERAGE OF EACH LOAD CELL lt 19 gt CONTINUE COLLECTION OF DATA lt 20 gt QUIT The selection of graph option will produce the graph for that channel on the screen
10. F CHANNEL NUMBER 3 DATA OF CHANNEL NUMBER 4 REDUCED DATA OF CHANNEL NUMBER 1 REDUCED DATA OF CHANNEL NUMBER 2 REDUCED DATA OF CHANNEL NUMBER 3 REDUCED DATA OF CHANNEL NUMBER 4 DEVIATION FROM AVERAGE OF EACH LOAD CELL CONTINUE DATA COLLECTION QUIT Options 1 through 8 are self explanatory Actually Options 1 to 16 are reserved for raw and reduced data The numbers shown on the screen will vary depending on the number of channels activated Option 17 plots the deviation of loads from average If Option 19 is selected the execution of the program will be returned to Step 11 while the Option 20 will stop the execution of the program 4 EXAMPLE 1 In Example 1 the calibration program is used for calibrating a FWD device The default values and the test conditions will be shown in the next paragraph The answers entered from the keyboard are highlighted for better understanding The following message will appear on the screen WELCOME to CALIBRATION PROGRAM PRESS RETURN TO CONTINUE TO STOP EXECUTION AT ANY TIME PLEASE ENTER 99 lt CR gt PLEASE CHOOSE ONE OPTION lt C gt COLLECT AND REDUCE DATA lt R gt REDUCE COLLECTED DATA O WHICH DEVICE DO YOU WANT TO CALIBRATE lt 1 gt FOR DYNAFLECT lt 2 gt FOR FWD lt 3 gt FOR OTHERS FEE eee eee HE DEFAULT VALUES ARE rrr rrer errr rrer _ a a naaa aa ia Aa eai _ ada aad diaaa ea a TOTAL NUMBER OF CHANNELS 5 NUMBER OF GEOPHONE 2 NUM
11. LOT OPTIONS 2 HIT ENTER TO INITIALIZE THE CURSOR 3 USE CURSOR KEYS TO MOVE AROUND THE GRAPH 4 HIT ENTER TO GET THE COORDINATES 5 HIT ENTER TO RETURN TO PLOT OPTION MENU 12 IN CASE YOU DON T WANT TO USE CURSOR HIT ENTER THREE TIMES TO RETURN TO PLOT OPTION MENU PRESS ENTER TO CONTINUE PLEASE ENTER THE PLOT OPTION 1 RAW DATA OF CHANNEL NUMBER 1 2 RAW DATA OF CHANNEL NUMBER 2 lt 3 gt RAW DATA OF CHANNEL NUMBER 3 4 RAW DATA OF CHANNEL NUMBER 4 5 RAW DATA OF CHANNEL NUMBER 5 6 REDUCED DATA OF CHANNEL NUMBER 1 lt 7 gt REDUCED DATA OF CHANNEL NUMBER 2 8 REDUCED DATA OF CHANNEL NUMBER 3 lt 9 REDUCED DATA OF CHANNEL NUMBER 4 10 REDUCED DATA OF CHANNEL NUMBER 5 17 DEVIATION FROM AVERAGE OF EACH LOAD CELL 19 CONTINUE COLLECTION CF DATA 20 QUIT If Option 1 is selected a graph similar to one shown in Figure 1 will appear on the screen In this figure the raw velocity obtained from the geophone is shown The Option 6 will show the plot on the screen as shown in Figure 2 In this figure deflection obtained from the geophone is shown Options 8 9 and 10 will result in graphs on the screen similar to that shown in Figure 3 Options 3 4 and 5 will also show the similar graph with only one difference the graph will show the raw voltage obtained from the load cell Option 17 will result in a graph similar to Figure 4 Finally a data file will be obtained consisting of the test con
12. U WANT TO OVERWRITE Y N N INPUT THE NAME OF OUTPUT FILE repo 19 HIT ENTER TO BEGIN ACQUISITION PLEASE WAIT WHILE DATA IS COLLECTED DATE ON WHICH DATA COLLECTED 05 08 1990 TOTAL NUMBER OF CHANNELS 4 NUMBER OF GEOPHONES 2 NUMBER OF LOAD CELLS 1 NUMBER OF OTHER DEVICES 1 CHANNEL DESCRIPTION CHANNEL GAIN ID NAME 1 1 G1 GEOPHON1 2 1 G3 GEOPHON2 3 1 L4 LOAD1 4 1 O1 OTHER1 TIME SPAN FOR COLLECTING DATA SECONDS 125 DATA POINTS PER CHANNEL 512 PRESS ENTER TO CONTINUE PEAK AT FREQUENCY 15 Hz FOR GEOPHONE G1 PEAK AT FREQUENCY 10 Hz FOR GEOPHONE G3 DEFLECTION FROM GEOPHONE G1 43 MILS PEAK DEFLECTION FROM GEOPHONE G3 56 MILS PEAK LOAD FROM LOAD CELL L4 2345 Ibs OUTPUT FROM OTHER DEVICE O1 2 3 VOLTS PRESS ENTER TO CONTINUE lt CR gt THIS PROGRAM HAS A CURSOR TO FIND THE COORDINATES OF ANY POINT ON THE GRAPH 1 CHOOSE ONE OF THE PLOT OPTIONS 2 HIT ENTER TO INITIALIZE THE CURSOR 3 USE CURSOR KEYS TO MOVE AROUND THE GRAPH 20 4 HIT ENTER TO GET THE COORDINATES 5 HIT ENTER TO RETURN TO PLOT OPTION MENU IN CASE YOU DON T WANT TO USE CURSOR HIT ENTER THREE TIMES TO RETURN TO PLOT OPTION MENU PRESS ENTER TO CONTINUE lt CR gt PLEASE ENTER THE PLOT OPTION lt 1 gt RAW DATA CHANNEL NUMBER 1 lt 2 gt RAW DATA OF CHANNEL NUMBER 2 lt 3 gt RAW DATA OF CHANNEL NUMBER 3 lt 4 gt RAW DATA OF CHANNEL NUMBER 4 lt 5 gt REDUCED DATA OF CHANNEL NUMBER 1 lt 6 gt REDUCED DATA O
13. USER S MANUAL TO COMPUTER PROGRAM CALIBRAT A PROGRAM FOR CALIBRATION OF NONDESTRUCTIVE TESTING DEVICES by Vivek Tandon and Soheil Nazarian Research Project 913 DEVELOPMENT OF AN ABSOLUTE CALIBRATION SYSTEM FOR NONDESTRUCTIVE TESTING DEVICES Conducted for Texas State Department of Highways and Public Transportation by Center for Geotechnical and Highway Materials Research The University of Texas at El Paso Research Report 913 1F Volume 3 August 1990 ABSTRACT The Falling Weight Deflectometer FWD and Dynaflect devices are presently being used by highway agencies The primary function of the FWD and Dynaflect devices is to measure a deflection basin due to a load imparted to the pavement Deflection basins measured in the field are used in backcalculating modulus profiles of pavement sections As such it is critical to determine the deflection basins in the field with great accuracy Velocity transducers also called geophones are used to determine the deflections and load cells are utilized to measure applied load It has become increasingly important in recent years to be able to evaluate the performance of the deflection and load sensors of the Falling Weight Deflectometer or the Dynaflect devices It has been shown that a small error in the deflection measured in the field may yield significantly erroneous modulus values As such a very reliable method for evaluating the accuracy of the sensors used for determinin
14. ation factors for each sensors Depending on the type sensor selected the program will request the identification codes for each channel ENTER THE 10 OF GEOPHONE NUMBER 1 3 CHAR MAX ENTER THE ID OF LOAD CELL NUMBER 1 3 CHAR MAX if the entered ID of the geophone is G1 or G2 and ID of the load cells are L1 L2 and L3 the program will skip the next step Otherwise the program will ask for the natural frequency damping ratio and transductivity of each geophone and the calibration factor for each load cell as shown ENTER THE NATURAL FREQUENCY IN Hz FOR GEOPHONE G3 ENTER THE DAMPING RATIO IN DECIMAL FOR GEOPHONE G3 ENTER THE TRANSDUCTIVITY FOR GEOPHONE G3 VOLTS in Sec ENTER THE CALIBRATION FACTOR IN Ibs Volts FOR LCEL4 However if the selected sensor is other than the geophone or load cell the program is capable of only considering a constant calibration factor The next message will appear on the screen if Option S is selected in Step 8 ENTER TIME SPAN FOR COLLECTING DATA Sec This option allows the user to change the time span for collecting the data For FWD device the time span is 0 125 mSec and for Dynaflect device the time span is 1 0 Sec However the program is not capable of collecting data for more than 1 0 Sec due to limitations of the A D board The following message will appear on the screen ENTER THE DESIRED NO OF DATA POINTS PER CHANNEL 256 512 1024 The number of data points per channel to be collected can be chang
15. ditions used for testing and data obtained from the sensors For this example this file will be called TEMP1 See Step 11 This file can be utilized for future reference Amplitude Volta Deflection mila 13 4 0 00 0 05 0 10 0 15 0 20 0 25 Time Sec Figure 1 Example of Raw Data Obtained from a Geophone 2 4 0 00 0 05 0 10 0 15 0 20 0 25 Time Sec Figure 2 Example of Deflection Obtained from a Geophone 14 Load kips 1 0 000 0 025 0 050 0 075 0 100 Time Sec Figure 3 Example of Load Obtained from Load Cells 0 125 15 Average Load Load cell 1 Load cell 2 Load cell 3 Load kips 1 0 000 0 025 0 050 0 075 0 100 0 125 Time Sec Figure 4 Example of Average Load Compared with Individual Load Cells 16 5 EXAMPLE 2 This example is selected to show how the devices other than the Dynaflect and FWD can be calibrated The program can be started as described in Section 1 3 The following message will appear on the screen lt CR gt O lt WELCOME to CALIBRATION PROGRAM PRESS RETURN TO CONTINUE TO STOP EXECUTION AT ANY TIME PLEASE ENTER 99 PLEASE CHOOSE ONE OPTION lt C gt COLLECT AND REDUCE DATA lt R gt REDUCE COLLECTED DATA WHICH DEVICE DO YOU WANT TO CALIBRATE lt 1 gt FOR DYNAFLECT lt 2 gt FOR FWD lt 3 gt FOR OTHERS WOULD YOU LIKE TO HAVE EXTERNAL TRIGGER Y N PLEASE ENTER THE TYPE OF LOAD IMPARTED
16. ed using this option However the maximum limit is 1024 data points per channel The Option A of Step 8 will ask the questions of Step 9A through Step 9D However the Option T and D of Step 8 are not available if Option 1 or 2 of Step 3 was selected After changing the default values the following message will appear on the screen DO YOU WANT TO CHANGE THE DEFAULT VALUES Y N If the answer to the above question is Y the program will go back to Step 8 However if the answer is N the program will proceed STEP 11 STEP 12 STEP 13 STEP 14 STEP 15 The following message will appear on the screen NOW BOARD IS READY TO COLLECT DATA INPUT THE NAME OF OUTPUT FILE The filename should not be longer than eight characters and the extension of the filename should not be more than three characters the file is straight binary file The content of the file will be the selected test conditions and the data collected by the board After the data file has been selected the program is ready to collect the data through the A D board The following message will appear on the screen HIT ENTER TO BEGIN ACQUISITION When no external trigger is used as soon as the enter key is depressed the data acquisition will start However if the external trigger is used the data acquisition will start as soon as the triggering level is satisfied The following message appears on the screen PLEASE WAIT WHILE DATA IS COLLECTED If Option R is s
17. elected in Step 1 then the program will skip all these steps and asks the following question ENTER THE INPUT FILENAME The filename should not be longer than eight characters and the extension of the filename should not be more than three characters The program will read the data from the specified file and will display the test set up In this step the data will be reduced The following message will appear on the screen PRESS ENTER TO CONTINUE The program will reduce the data and will show on the screen the final deflection and load values obtained from the geophones and load cells The following messages will appear on the screen giving the information about how to use the cursor in the plot option PRESS ENTER TO CONTINUE THIS PROGRAM HAS A CURSOR TO FIND THE COORDINATES OF ANY POINT ON THE GRAPH 1 CHOOSE ONE OF THE PLOT OPTIONS 2 HIT ENTER TO INITIALIZE THE CURSOR 3 USE CURSOR KEYS TO MOVE AROUND THE GRAPH 4 HIT ENTER TO GET THE COORDINATES 5 HIT ENTER TO RETURN TO PLOT OPTION MENU IN CASE YOU DON T WANT TO USE THE CURSOR HIT ENTER THREE TIMES TO RETURN TO PLOT OPTION MENU For example for a four channel set up the following statements will appear PRESS ENTER TO CONTINUE PLEASE ENTER THE PLOT OPTION lt 1 gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt 7 gt lt 8 gt lt 17 gt lt 19 gt lt 20 gt RAW RAW RAW RAW DATA OF CHANNEL NUMBER 1 DATA OF CHANNEL NUMBER 2 DATA O
18. g these deflections is necessary If geophones are used to determine deflections the algorithm developed for calculating deflection also becomes important A geophone measures the so called raw particle velocity of the pavement surface directly underneath it Therefore the methodology and algorithm employed to obtain the actual displacement must be carefully considered Errors in the load cell measurements are not as important but should be avoided for reliable results This report contains a user s manual for a computer program called CALIBRAT The program has been developed to control the acquisition and digitization of sensor s signals to reduce the collected data and to present the data The program is coded for an IBM PC Compatible equipment with DT 2825 Analog to Digital board manufactured by Data Translation Inc The program is written in FORTRAN and compiled with MICROSOFT FORTRAN 4 1 Compiler KEY WORDS Falling Weight Deflectometer Dynaflect Sensors Calibration Software METRIC SI CONVERSION FACTORS APPROXIMATE CONVERSIONS TO SI UNITS APPROXIMATE CONVERSIONS TO SI UNITS Symbol When You Know Multiply By To Find Symbol Symbol When You Know Multiply By To Find Symbol LENGTH LENGTH mm millimetres 0 038 Inches in ape bolas m metros 3 26 feet ft yd rd 48 metres 1 09 yards yd yards 0 914 metres m km kilometres 0 621 mites mi mi miles 1 61 kilometres km E AR
19. he five reserved Identification Codes are used the program will inquire about the calibration characteristics of the sensor Step 9C will appear if Option S is selected so that the sampling period can be varied Should the number of data points per record be changed Option N should be selected Step 9D will appear as the result of selecting this option The following messages will appear on the screen if Option T is selected ENTER NUMBER OF GEOPHONES ENTER NUMBER OF LOAD CELLS ENTER NUMBER OF OTHER DEVICES The computer program will activate the number of channels of A D board depending upon the total number of channels selected The program will resume from the next step The following questions will be asked if Option D or is selected ENTER CHANNEL NAME 20 CHAR MAX ENTER DESIRED GAIN 1 10 ENTER DESIRED CHANNEL FOR GEOPHONE NUMBER 1 The first question will change according to the selected sensor For example if load cell is selected instead of geophones then the program will ask to enter the desired channel for load cell 1 The second question requests information about whether the data collected by the board needs to be multiplied by that factor The third question requests to give some name for identification These messages will appear for all the channels selected for collection of data After above three questions are answered the program will resume and ask about the STEP 9C STEP 9D STEP 10 calibr
20. lt Values for Dynaflect and FWD Devices Item Total Number of Channels Number of Geophones Number of Load Cells Number of Other Sensors Geophones Connected to Load Cells Connected to ID of Geophones ID of Load Cells Time Spans Sec Note that these identification codes are reserved for well calibrated sensors see step 5 Number of Data Points The default values of other devices are similar to the Dynaflect Device Dynaflect 2 3 Falling Weight Deflectometer 5 Channels 1 and 2 Channels 1 and 2 Channels 3 and 4 Channels 3 4 and 5 G1 and G2 256 G1 and G2 L1 L2 and L3 0 125 256 used in the system 3 STEP 8 STEP 9A STEP 9B In this step facilities for changing the default values are provided The question is WHAT VALUES DO YOU WANT TO CHANGE lt T gt OTAL NUMBER OF CHANNELS lt D gt ESCRIPTION OF CHANNELS lt S gt TIME SPAN FOR COLLECTING DATA lt N gt UMBER OF DATA POINTS A LL VALUES if Option 1 or 2 was selected in Step 3 the first two items cannot be changed Depending on the option selected one or all of Steps through 9E may appear If is selected Step 9A will appear In general the number and nature of channels and sensors used are defined If D is selected the user will be able to change the identification codes of different channels as described in Step 9B Once again it should be mentioned that unless one of t
21. ram coded for the purpose of calibrating nondestructive testing devices The program had been developed to control the acquisition digitization and retrieval of analog data produced by the calibration sensors to reduce the collected data and to present the data The program provides software controlled initialization and identification of the analog to digital conversion A D board and facilitates the collection of data using Direct Memory Access DMA This program is coded for an IBM compatible computer equipped with a DT 2825 A D board manufactured by Data Translation Inc The program is written in FORTRAN and compiled with Microsoft Version 4 1 FORTRAN compiler In addition two graphics libraries also required N N O 11 2 INITIAL PREPARATION The following equipments are needed for executing the calibration program IBM PC or Compatible Dos 3 3 Compaq or later versions Microsoft FORTRAN Compiler Version 4 1 ATLAB Software by Data Translation Inc Version 1 11 PLOTIT Graphics Software Floating point math coprocessor 80387 Signal Conditioning unit Two well calibrated geophones Three or Two Depending on the device load cells and power amplifiers for load cells Triggering mechanism only for calibration of the FWD device Proper connectors for geophones and load cells For compiling the calibration program the following files and libraries are needed ATLAB LIB developed by
22. sensors are utilized the user can add these sensors to the configuration The identification code of the load cells and geophones are used to distinguish different sensors It is important to note that Identification Codes of G1 G2 L1 L2 L3 are reserved Identification codes G1 and G2 correspond to the two well calibrated geophones provided by the calibration system The calibration characteristics of these five sensors are internally stored in the program if any other Identification Codes are used the program will inquire about the calibration characteristics of the sensor The time span and number of data points can be changed as needed However the user is discouraged from changing these values for Options 1 and 2 The next question can be used to change the default values DO YOU WANT TO CHANGE DEFAULT VALUES Y N Due to a negative response the execution of the program will resume from Step 10 However the selection of Y will give the message described in the next step This question will appear DO YOU WANT TO READ DEFAULT VALUES FROM A FILE Y N This option will allow the user to read the default values from a file previously stored by the program Then the following message will appear on the screen if the response to the previous question is Y INPUT THE NAME OF INPUT FILE The filename should not be longer than eight characters and the extension of the filename should not be more than three characters Table 1 Defau
23. teady state sinusoidal load or an impulse load can be calibrated If this option is selected a table containing variables that can be varied as well as default values for these variables will appear on the screen The variables consist of a number of channels used for collection of data the type of sensor used with each channel the calibration properties of each sensors the time span for collection of data and the number of data points per channel The default values can also be read from a file previously saved IMPLEMENTATION STATEMENT The software can be immediately used for the purpose of calibrating the eleven FWD devices owned and operated by the SDHPT TABLE OF CONTENTS ABSTRACT ooo it A A Gale Ova ened Soe eet aw td i PREFACE oes vou ce las e D water s e Mees LIST OF REPORTES sta oa rl dew RS eee oe Seer aa dU ea aa RAS a he cds iv SUMMARY iaa daa OTE oe Roe cow aedi al ee ab sawed er deb dra i IMPLEMENTATION STATEMENT co a CR ER vi INTRODUCTION us its a Tg a A 1 CHAPTER 2 INITIAL PREPARATION 1 CHAPTER 3 EXECUTION OF PROGRAM 2 CHAPTER EXAMPLE Toon o SAA A ERR dw OR is ca 9 CHAP DER 5 EXAMPLE 2 AA bre Rew be Sew A ead 16 vii COMPUTER PROGRAM CALIBRAT 1 INTRODUCTION Program CALIBRAT is an interactive prog
24. xas State Department of Highways and Public Transportation August 1990 Research Report 913 1F Volume 3 User s Manual to Computer Program Calibrat by Vivek Tandon and Soheil Nazarian contains a user s manual for a computer program called CALIBRAT for use by the Texas State Department of Highways and Public Transportation August 1990 Research Report 913 1F Volume 4 Appendices and Supporting Data by Vivek Tandon and Soheil Nazarian for use by the Texas State Department of Highways and Public Transportation August 1990 iv SUMMARY A software was developed for a Compaq Portable 386 computer manufactured by Compaq Computer Corporation The computer program is capable of 1 controlling the acquisition and retrieval of the analog data captured by the sensors 2 reducing the collected data and 3 displaying and analyzing the raw and reduced data The program provides software controlied initialization and identification of the A D board and facilitates the collection of data using Direct Memory Access DMA The acquired data are stored in a file for further processing The program can be used in two modes 1 the data are collected through the board and processed or 2 previously collected data are reduced The software is preprogrammed for calibration of either the dynaflect the FWD device order to make the system flexible a third option is provided With this option any other type of sensor under either a s
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