VFR 1 Recorder USER MANUAL
Contents
1. 51322E40 Low Range of the data The sensitivity for each channel must be entered on Page 3 oimply sliding the bars or typing in a value sets the Bias and Gain for each channel The range is O to 255 If the Bias is set for 127 the voltage output of the analog channel will be 77 of Vref or 1 65 volts center scale The Gain setting is not the actual gain but is displayed just to the right Note It is not recommended to set the bias below a value of 20 when the channel is used as differential inputs because of ground distortion problem associated with single supply amplifiers INFO To use an analog channel as a single ended input set the Bias Setting to 0 and ground the IN input DO NOT EXCEED 3 3 volts in the IN and IN inputs When the Gain setting is changed the actual gain of the analog channel is display here This display is the Units per Bit value based on the current gain setting This is the important display When the Bias setting is moved up and down the total range remains the same but the High and Low Range will move up and down If the Bias is set for 127 the High and Low Range will be the same magnitude When the Gain setting is changed the total magnitude will increase or 24 decrease but the bias center point will remain the same IMPORTANT The sensor sensitivity and excitation voltage for each channel must be entered on Page 3 before these values will be correct Thi2. Example VFR Settings 51 This appendix contains four common tests that are performed at Eglin AFB and suggested VFR settings for each Gun Shot with Triggering on Wall Impact Setting Trigger 1 Pad 350 G switch between this pad and Vcc Position the G switch so that it will close on setback Trigger 2 Pad 350 G switch between this pad and Vcc Position the G switch so that it will close on impact Accelerometer Speed Mode Slow Speed Select OO Mode 0 1 Memory Size Min Fast Speed Time Min Slow Speed Time Auto Sensor Balance Start Auto Sensor Balance Test Trigger Channel Trigger Level Above Bias Auto Trigger Point CH Bias CH Gain Battery Test Press this button to verify accelerometer bias level The Bias Level should appear on the CH Bit Value of the Main Menu Stop Press this button after Battery Test is completed Quick Startup After T1 Disabled T1 Min Pulse Width Ee T1 Start Press when ready to load VFR into test item Start Note This setup will keep the VFR in a sleep mode until activity is seen on the T1 Trigger switch The Trigger 1 switch will turn on the recorder when the gun is fired The first 6 millseconds of data will be on the positive rail as the power supplies turn on The data at the positive rail will cross the Auto Trigger Point and put the VFR in a High speed mode The VFR will stay in the High Speed mode until the memory is filled after approximately 2 2 seconds of data collection
3. 52 Gun Shot with Triggering on Gun Set Back Method 1 Description Trigger 1 Pad Unused 350 G switch between this pad and Vcc Position the G switch so that it will close on set back Connect so that acceleration provides a positive output Slow gt Fast Slow Speed Select Select a slow speed that will give you time to get the test item from the lab to the gun Selecting a 7 will give you approximately 20 hours to get the test completed Mode 0 1 As desired 512K Min Fast Speed Time 255 Min Slow Speed Time Auto Sensor Balance Start On On Select channel with the accelerometer Select a value that is below peak G level Above Staring Bias 128 As desired N A N A Disabled Do not press Press when ready to load VFR into test item Note This setup will start the recorder in the low speed mode at the lab when the start button 1s depressed Insure that you have enough battery power to operate the VFR for the time required to complete the test as it will be in a high current mode until the test is completed When the gun set back forces close the Trigger 2 G switch or the auto trigger circuit see a signal above the bias level the VFR will go into a high speed mode and will remain in the high speed mode until the memory is filled Auto Sensor Balance Test 53 Gun Shot with Triggering on Gun Set Back Method 2 Setting Trigger 1 Pad Wire to outside of test item with the circuit described below Trigger
4. Mode 1 33 Digital Channel Titles 34 VFR Software Program Display Data This is the Display Data menu of the VFR program It allow the User to Display the data collected modify the channel data print it and save it as an ASCII file When in this program the recorder and computer will not communicate i Display VFR Data File vi File Edit Operate Windows Help VER e uhe Ei 17 0880E 6 540 126E 0 ECA Seen F Wc co icu CH3 cH4 CHE mH CHE 0 a Soe Depa tesi Pie Lew Reset r1 f T2 f T2 Linkof Gnd f vec i E o BU Press the Read File switch to load a data file from disk The data file should have a suffix of TES If not type in the entire name of the data file Then press Open 35 Enter the name of the data file to read Look in Files of type Custom Pattern IES a Display VFR Data File vi Eile Edit File Edit Operate Project Windows Help 999 Project Windows Help uhe on FC 2 36PM 2 6 98 Be M 23 1030E 3 3 4 894E 0 D PIER Seer Hc cen ice mcH3 cHs 4 CHE gH cue Riead File Save File Ti f re T link off Gna ENENERURESIENEREN i 17 0880E 6 139 9849E 3 36 CAPressurelES VFR DD15 Gun Test zl Shows the data file name and path Displays the serial number of the recorder that collected the data the date of the test and the test title The date and time the data was downloaded and the nam
5. The vibration table could damage the accelerometer if the frequency of the vibration is too high After the test the recorder must be removed from the glass beads to enable the interface connection Paraffin Encapsulation The recorder must first be interfaced with all sensors that are to be contained within the paraffin The recorder is positioned and centered within the test fixture Small strips of porous foam function well as centering devices The test fixture is filled with paraffin that has been preheated to 750C 1670F Fill the test fixture approximately half full and then slowly agitate the paraffin by moving the test fixture to insure that all trapped air pockets are allowed to escape Complete the filling As the paraffin cools shrinking occurs and more paraffin must be added to fill the void After the test the recorder must be removed from the paraffin encapsulation to enable the interface connection The procedure is a time consuming process due to the temperature limitation of the recorder Position the recorder in an oven and heat to 750C 1670F until all the paraffin has turned to liquid Care should be exercised in positioning the encapsulated 49 recorder to insure that the interface board does not make contact with a metal surface as the paraffin melts WARNING Using heat above 750C 1670F exceeds the operating temperature limits of recorder components and could result in failure of the recorder 50 Appendix A
6. occurs press the Program Are your sure you wantta PROGRAM CHANNEL DATA PREVIOUS CHANNEL DATA IN THE RECORDER WILL BE ERASED CONTINUE ABORT Channel Data button again Always re read the Channel Data to verify it was programmed successfully 32 Sample time 1 0cbe b Test Date Operator s Name John Doe CHO Title 2 Axis CHO SensorModel Endevco 8511 CHO Sensor Serial AGT CHO Sensor Units PS CHO Sensor Sensitivity 0 024e 3 TERMES CHO Sensor Excitation 10 CHO Units per Bit CHO Zero Level Bit CH3Tile Ch3Anslog CH4Title ChdAnalog CH5 Title ChbAnslog CHE Title CH amp Analog If blinking the recorder is communicating properly with the program It will stop blinking when the software is programming the recorder and resume when finished If is stops inspect the power supply and the serial cable This section is for general information concerning the test Note The Sampling Time MUST be entered correctly for proper operation of the recorder This section contains information about each channel Do not enter a value for the Units per Bit or Zero Level Bit blocks This is calculated by the software when the data is downloaded Note The Sensor Sensitivity and Excitation MUST be entered correctly for proper operation of the recorder Analog Channel Title s for Ch3 through Ch6 which are only valid for theVFR2 recorder in
7. battery voltage Note If the battery voltage falls below 5 volts while the recorder is collecting data the recorder will automatically put itself into High Speed until the memory is full and shut itself down to save battery energy and prevent data loss The current recorder temperature is displayed while the serial link is connected Also the maximum temperature the recorder has seen in its lifetime is displayed The display can be either in F or C 15 FastSpeed 17 0880E 6 Slow Speed 349952E 3 After a test has been completed the highest and lowest temperature during that test is displayed These values are reset when the Start button is pressed and the serial link is disconnected After a test has been completed the starting and ending battery voltages are displayed The recorder starts monitoring the voltage only after the serial link is disconnected The voltage is monitored about once a minute The current memory size This can be selected for 512K or 32K data points The memory size dedicated for each channel The value is determined by the mode number of analog channels activated and the memory size selected 32K or 512K data points The Channel mode is either 0 or 1 for the VFR2 recorder Mode 0 has 3 programmable analog channels only Mode 1 has 3 programmable analog channels and 4 buffered analog channels The VFR2 recorder has only Mode 0 which is 1
8. by high gain This can be over ridden by disabling the Auto sensor Balance at Start reducing the gain or fixing the sensor INFO To balance the sensor bridge set the Bias level to 127 use the desired gain level for the test and program the settings Press the Battery Test button to put the recorder in the STANDBY mode Then put a resistor decade box across IN and ground or IN and ground and adjust the resistance until the output of the analog channel is 1 65 volts or bit level 127 Install the resistor and enable the Auto Sensor Balance at Start The sensor can be automatically balanced when the recorder first starts to record data So if the desired bias level is 50 but because of gain and sensor unbalance the output is 60 this feature will automatically adjust the bias to give the output of 50 This is done just before the recorder starts collecting data only This feature should be disabled when using single ended inputs Pn slow speed ONLY Mult S Slow gt Fast Speed 34 9962E 3 17 0880E 6 127 The reason for this feature is compensate for a sensor drifting due to temperature changes The higher the gain the worse this problem can become If enabled the recorder will automatically adjust the bias to maintain it at the starting bias level This is only done during the Slow sampling rates occurs at slow intervals of approximately 30 60 seconds and will only change up o
9. correct There are two methods of determining at what level the Auto Trigger will activate The first method Above Starting Bias triggers the recorder into High speed when the signal exceeds the delta Trigger Level above the Starting Bias line the bias line when the recorder first started to record data Therefore if the signal exceeds the exact same voltage level anytime during the test the recorder will be triggered The second method Above Floating Bias triggers when the signal exceeds the delta Trigger Level above the current bias line Therefore the bias line on which the Auto Trigger is based on can continually change throughout the test This Floating point will only change one bit at a time over several seconds and DOES NOT change the actual bias line setting of the analog channel It is an internal reference only When the Trigger Level slide switch is changed the actual trigger level value is displayed here based on the sensitivity entered on Page 3 This value is either Above 26 the Floating Bias level or Above the Starting Bias level This section Enables or Disables the Auto Sensor Balance features of the recorder INFO If the Auto Sensor Balance at Start is enabled and a Sensor Error occurs when the START button is pressed the recorder is turned off and put in the Standby mode The reason can be a bad sensor bad wire or an unbalanced sensor bridge caused
10. of each item on that menu VFR Software Program Main Menu Page 1 of the Main Menu This is the opening menu of the VFR program It shows the current status of the recorder allows the control of the recorder and download and display of the data Il VFR Main VI vi File Edit Operate Windows Help bas Version 4 0 2 402 About ms 0016 Status Sensor Error Status Memor Size K al haa COM Polling Data points CH 15 CH 0 Bit Value 2S ees 128 K 8 CHI BitValue LINK CH Made 3 CH2BitValue o Battery _ Current Temp a FastSpeed 17 0880E 6 C 5 Baud Rate 33600 34898952E 3 Fa slow Speed 91 Max Temp Version 40 2 About Displays the Serial Number and the current vrR2 0016 operating status of the recorder Displays the program version and copyright credits shown below VFR version 4 0 2 1 23 38 This is the main used to link to the VFR change the settings download the data and display it This software is far use on only one computer at ane time I there are any questions please contact IES Inc This software was written by Instrumentation and Engineering Services Inc IES for ES and created using Lab lE 4 1 from National Instruments LabVIEW executable Lab EW copyright 1996 National Instruments Corporation All Rights Reserved United States Patent Nos 4 301 221 4 914 560 5 231 587 5 301 355 and 5 475 951 Other patents pending eamartHeap memo
11. point amplitude and time positions are updated and displayed Both the delta and the actual value are displayed The Zero button is used to set a reference Note The timing information is ONLY VALID in the High Speed areas Even in the Low Speed areas each data point you move the 40 Time 46 1889E 3 Amp 306 731E 0 A Pnt vent TE show Slow Data Only Show Multi speed cursor the time change will be at the High Speed sampling rate To allow this display to work with Low Speed sampling rates the Display Slow Data Only button must be pressed When this button is pressed the green displayed is zeroed at that cursor location When the Zero button is pressed and the cursor is moved the numbers displayed here will change based on this New zero reference Effectively the new values are the delta value from this zero point X Pts and Y Pts are the actual BIT value of the data point This displays the actual time amplitude and BIT values of the data at the cursor location of the active channel Note The Amplitude and the Y Pnt are based on the Zero Bias found in the View VFR Settings When Show Multi speed is selected all of the data is displayed both the Slow Speed and High Speed data points Note When the Show Multi speed is selected only the High Speed sampling rate is used to calculated the t
12. sse te ep et b adds bu adii 450 micro amps typical Sensor Reference VOllaBe iuste riti qi teret aH eT tide qiia diu tiui m tes 3 3 volts sensor Supply Current Per Channel ssse 20 milliamps maximum Physical SHOCK SUPVIVADINILY mimiriimimimmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm 100 000 g Temperature TRAM ecoute tedio en P dens o ttc etui abet eni ipn 320F to 160 F Temperature Range With Screening ccccccccccccecccssseeessseseeseeeeeeeeeeeees 650F to 160 F Encapsulation Size VER 1 146 dea Figure 1 VFR 1 Size Operational Theory Figure 2 shows a simplified block diagram of the VFR1 The major components of the recorder are the control logic the memory the analog to digital A D converter and the micro controller Following is a description of each functional block Control Logic The control logic provides the control logic that enables data collection when the recorder is triggered places the recorder in a data retention mode when the incoming data has filled the memory and enables an external computer to interrogate the memory to extract the data The control logic also provides correct timing for writing the data into memory and sequentially addresses all available memory locations ANALOG CH Z INPLIT BUFFER ANALOG CH 1 INPLIT BUFFER ANALOG CH B INPLIT BUFFER i GAIN AMPLIFIER LOW PASS FILTER DIGITAL CH CONTROL LOGIC MICHO CONTROLLER RS 25I DILIT
13. the non inverting input of an operational amplifier Do not apply a voltage greater than Vref or less than 0 volts to this input CH 0 OUT CH O OUT is the recorder channel 0 amplifier output This signal is also the input for the analog multiplexer Use only high impedance instruments to measure this signal OSC OUT OSC OUT is the output signal of the internal recorder oscillator The frequency of the oscillator out signal is the sampling rate of each channel This output is not active when the recorder in a sleep mode Vcc Vcc is the regulated power supply output This output will source 10 milliamps for an external load Vref Vref is the regulated power supply for powering sensors This power supply is only active while the recorder is acquiring data This output will source 30 milliamps GND GND is the power and signal ground SW GND This signal is a switched ground When the recorder 1s collecting data the SW GND is at ground potential When the recorder is in the sleep mode the SW GND is at Vcc level This single can only source sink milliamp BATT BATT is a connection for an external battery This input is not diode coupled to any of the other battery connections and should not be used in conjunction with any other battery This connection is intended to power the recorder when only one battery is used Use of this connection for powering the recorder eliminates the diode voltage drop that the other battery connections hav
14. 2 Pad 350 G switch between this pad and Vcc Position the G switch so that it will close on set back Accelerometer Connect so that acceleration provides a positive output Speed Mode Multi Speed Slow Speed Select select a slow speed that will give you time load and fire the gun selecting a 5 will give you approximately 20 minutes of data Mode 0 1 Memory Size 512K Min Fast Speed Time 100 mSec Min Slow Speed Time n n Auto Sensor Balance Start Auto Sensor Balance Test Trigger Channel Trigger Level Above Bias Auto Trigger Point CH Bias CH Gain Battery Test Stop Quick Startup After TI T1 Min Pulse Width T1 Start Start Note The VFR will be in a low speed mode until you apply an external Trigger 1 using the circuit below When the external Trigger 1 is applied the VFR will go into a high speed mode for 100 mSec then go to the low speed mode When the gun set back forces close the Trigger 2 G switch or the auto trigger circuit see a signal above the bias level the VFR will go into a high speed mode and will remain in the high speed mode for 100 mSec then go back to a low speed mode ECT PRE EXTERNAL E E RECORDER TRIGGER S secu AE bais 7V EXTERNAL IGS AS wey Ri d GK ND pane 54 Sled Track Test with Triggering on Wall Impact Setting Trigger 1 Pad 25 G switch between this pad an
15. Instrumentation and Engineering Services Inc VER 1 Recorder USER MANUAL ies iesrecorders com IES Inc Tel 1 850 515 1244 7552 Navarre Parkway Suite 42 Fax 1 850 515 1245 Navarre FL 32566 iT RA Trop l WISIS CHICA ONS arane a I Ia Teiug e essee E teens dy beatin adel sh tana dil houtiaat I POW Ce ghaimhhmmhanhamhnimmmhammhaannamhannmreamhaamahahhaamnmmaimnierernnihamhanminmnnnmhnnareimhmmaa 2 Idas rec Ce 2 Operational DIO es acest inte uas un had mesa ida ique me teu da imu dE 2 reri ol Faoi a aa hele Same ethane tee TRUE 2 Amalop to Dreital A D C OBVetlet o ida medic adven med dor 3 NEDO encontre tomi aa ence E E to wee EU UD uita 3 Nicro Conlie a 3 Oscillatot S DEE ireti en e ES E SN 4 PIMP UPS GAINS Gode EEE deut hn or utn E E nenas 4 7A 001 0 DU HU is he er Sr oS eL nee 4 PIAS CSrIN GS NWIOCS e M 4 Recorder Operational MOS dos cols ete be rbv ttem uc ies ae eee 5 SIS SUI Lae et St ee PER Se eta ee Pe Pa ee ee 5 SUING OY MEER 5 ETOCS 06 Ln CA eee rane ad NL MM E MM MAN EID TS er a 5 Awane ET vids o pb hd vt usi pute iia Hebe et edes distans lebe teu 5 Data BALLA 07216 mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmiH 5 Interface Signals Location and Description cccccccssssssseeseseeeeeeeceeeeeeeeeeeeeaaaaaes 5 Operattolal SOW ATE aaiae kanne TE E A O E A A O 9 VER Software Program Main Menu sssseeeeeeeseeeeeeee eene nn
16. PLIT INTERFACE MEMORY Figure 2 Block Diagram of VFR 1 MULTIPLE XEF amp BIT 440 Analog to Digital A D Converter The recorder utilizes a CMOS 8 bit A D converter for digitizing data The control logic selects the sampling rate The A D contains a multiplexer that 1s controlled by the control logic The multiplexer sequentially switches the A D input through all of the available channels samples the channel output digitizes the sampled level and then places the 8 bit digital word on the data bus for transfer to memory Memory The data storage device used is a CMOS low power static random access memory The recorder storage capacity is 524 288 data words 512K x 8 bits Each sample digitized by the A D is an eight bit word and is stored as a data word in the memory The A D sequentially samples each analog channel generating a data word for each and writing it in memory Once all of the analog channels have been sampled an addition eight bit data word is written in memory This data word contains the information from the eight digital channels Micro controller The micro controller is the brain that enables the recorder flexibility The laboratory computer communicates with the recorder through the micro controller The micro controller accepts recorder configuration data from the laboratory computer through an RS 232 serial link The configuration data contains instructions for oscillator speed amplifier gains amplifier
17. Stop button must be pressed before the data can be downloaded 13 The Start button must be pressed to start recording data Data will start at the beginning of the memory and sample at the slow sampling rate and ALL previous data will be erased A message shown below will prompt the User to be sure they are ready to start recording data Pressing Stop will turn off the data recording After the recorder is in the Recording Data mode the serial connection can be removed Note If there is a Sensor Error the recorder will put itself into the Standby mode an error Will sound and no data will be recorded You will need to correct the sensor problem before recording data Are your sure you wantto START the recorder ALL PREVIOUS DATAIN THE RECORDER vyvILL BE ERASED Version 4 0 2 About VFR2 0016 Awaiting External T1 indicates the recorder is in the Sleep mode waiting for the correct external 3 3 volt pulse on the T1 pin of the recorder to wake it The external pulse is ignored when the serial link is on When T1 occurs the recorder will automatically go into the Recording mode sampling at the slow sampling rate Note If there is a sensor error the recorder will be shut down into the Standby mode So it is recommended that the recorder be put into the Recording data mode on the bench before the test to verify proper operation After the recorder status indicates it is A
18. ad Data Control vi This screen pops up when downloading data The User can stop the downloading process by pressing the ABORT DOWNLOADING button It is Normal 16 for the memory counter to go slightly past the memory size and stop for a short period of time This message is displayed when ALL the data has been successfully downloaded from the Dewean Deia Camere d recorder s memory The data can be downloaded as many times as the Users wants but it will be erased if power is removed from the recorder or the START button is pressed If this message appears there was a problem downloading the data Either there was a bad connection or the User aborted the download process Simply try downloading the data again This message appears if not all the WARNING Only 60K of data was downloaded data was downloaded indicating You may want to try downloading again how much was actually received 18 After the data is downloaded it can be viewed by pressing the VIEW DATA button For normal operation with a serial connection to a recorder the switch should be in the VFR Link position This allows communication between the computer and the recorder If there is no recorder connected to the computer put the switch in the View data only position This disables the software from trying to establish a serial link with the recorder This is used for viewing data files only EXIT S the sof
19. bias and triggering modes Oscillator Speed The oscillator speed controls the recorder sample rate The VFRI has one high speed and eight low speed options for the oscillator The low speed is programmable and can be changed between tests Table 3 1 lists all of the available sample rates the sample periods and the recording time available at that rate 553 mSeconds 72 566 Seconds 450 Hz 2 215 mSeconds 4 838 Minutes 112 Hz 8 858 mSeconds 19 351 Minutes 35 433 mSeconds 77 404 Minutes 141 730 mSeconds 5 160 Hours Table 1 Oscillator Sample Rates and Recording Times Amplifier Gains The amplifier gain sets the full scale level of the data window It 1s similar to setting the volts division on a laboratory oscilloscope The gain adjustment allows the user to reconfigure the recorder for different test requirements and different sensors Unlike other commercially available recorders requiring gain calculations using complex formulas followed by gain settings through the installation of a calculated resistor value the VFRI is programmable using a laboratory computer Amplifier Bias The amplifier bias adjustment is similar to adjusting the vertical position control of a laboratory oscilloscope The bias adjustment allows the user to select the zero location of the data amplitude The bias adjustment allows the user to reconfigure the recorder for different test requirements and different sensors Triggering Modes The user is able t
20. chamber and evacuated to a pressure of less than 6 inches of Hg absolute greater than 24 inches of Hg gauge This reduced pressure should be maintained for at least 5 minutes The de aerated resin mix should be used in the subsequent steps as soon as possible Compound Application Introduce the de aerated casting compound into the mold The mold should be filled to the final desired height of the casting Place the filled mold in a vacuum chamber and evacuate to a pressure of less than 6 inches of Hg absolute The reduced pressure should be maintained for 15 minutes Return the mold to atmospheric pressure and remove the mold from vacuum chamber Remove the overflow chamber from the mold Additional casting compound may be required to fill the mold to the final desired height Compound Cure The filled mold should be cured at room temperature for at least 24 hours Do not leave the object in the mold for longer than 24 hours WARNING Do not heat the filled mold to accelerate the curing process Externally applied heat can aggravate the natural exothermic reaction and permanently damage the recorder or battery 48 Recorder Packaging The recorder has been encapsulated in a shock resistant epoxy resin to enhance the shock survivability An additional encapsulation is required to physically locate the recorder within the test fixture fill all of the voids and prevent any motion during hostile tests The three methods of encapsulation that
21. d Vcc Position the G switch so that it will close on setback 350 G switch between this pad and Vcc Position the G switch so that it will close on impact Min Slow SpeedTime 0 Press this button to verify accelerometer bias level The Bias Level should appear on the CH Bit Value of the Main Menu Press when ready to load VFR into test item Note This setup will keep the VFR in a sleep mode until activity is seen on the T1 Trigger switch The Trigger 1 switch will turn on the recorder when the when the test item on the sled track 1s fired The first 6 millseconds of data will be on the positive rail as the power supplies turn on The data at the positive rail will cross the Auto Trigger Point and put the VFR in a High speed mode and the VFR will stay in the High Speed for 100 mSec them return to Low Speed At impact when either the Trigger 2 switch closes or the auto trigger feature is activated the recorder will go to the High Speed mode and collect data for 100 mSec 55 Appendix B VFR 1 Signal Locations 56 osc our an 5 e o 5c pwr 5232 rx 22x LL cHa IN THG 2 CH2 IN Dig 7 ig amp ig 5 Dig RATT RATT 1 RATT 2 GND SW GND OG 7 THG 1 GND CH1 IN AG a OG 1 OG 2 OG 3 57
22. d to the recorder When an Auto Trigger occurs several Speed Modes can be programmed to occur If the Slow Speed ONLY mode is selected the Auto Trigger is ignored and the recorder will remain in Slow Speed In the Multi Speed mode the recorder starts out in Slow Speed and when an Auto Trigger occurs the recorder is put into High Speed for a certain length of time then returning to the Slow sampling mode If another trigger event occurs the recorder will go back into High Speed This can be repeated until memory is filled In the Slow Fast Speed mode the recorder starts in Slow Speed until an Auto Trigger occurs and the recorder is then put into High Speed until the memory is full Note This switch does not control the external T2 pulse so when T2 occurs the recorder is put into High Speed 29 slow speed select 3 4 slow Sample Periodfsec 14 B DB000DE 0 p 127 The recorder is put into the Fast Speed sampling rate when the Auto Trigger or external T2 occurs Otherwise the recorder samples at a Slow Speed rate which can be selected by this switch This is the Fast Speed sampling rate of the recorder when an Auto Trigger of external T2 occurs The User cannot change this The maximum time data will be collected based on the Slow Speed selected and the memory size This can be shorter if there are multiple High Speed events reco
23. displayed When there is a High Speed event it is represented as a single spike of date with the correct magnitude Note When the Show Slow Data Only is selected the time is calculated using the Slow Speed sampling rate when the cursor is moved Allows the User to view how the recorder was programmed for the test The Channel data can be edited This is covered in another section of the software manual Data can be EXPORTED to an ASCII data file in a spreadsheet form for further data analysis 44 When pressed this display appears and gives several options for making an ASCII data file This can be aborted by pressing the EXIT button Note The display data will be saved in an ASCII file De Populate the ASCII data file i c T cmm aum If YES is selected the time base in the spreadsheet data file will begin with ZERO time Otherwise the current time displayed on the graph will be used veg Reduction Facto If YES is selected the data Populate the ASCII data file AS file size is reduced by the Reduction Factor that is entered For example if the reduction factor is 10 every 10th data point is saved to the ACSII file reducing the physical size of the file by 90 Save File This saves any changes to the data file record A Either the ENTIRE data file can be saved or just the DISPLAYED data Read File Loads a data file from the disk n 45 Ex
24. e BATT 1 BATT 1 1s a connection for an external battery This input 1s diode coupled to Battery 2 and External Power Input BATT 2 BATT 2 1s a connection for an external battery This input 1s diode coupled to Battery 1 and External Power Input EXTERNAL POWER INPUT EXTERNAL POWER INPUT is a connection for an external battery This input is diode coupled to Battery 1 and Battery 2 inputs This input is used by the interface box for application of external power during the recorder programming and data retrieval TRIG 1 TRIG 1 1s a latched input signal that provides a method of initiating the recorder data collection operation This trigger signal is a positive pulse that can be between the voltage range of 3 0 to 10 volts TRIG 2 TRIG 2 1s a latched input signal that provides a method of initiating the recorder high speed data collection operation This is a CMOS input with a 10K ohm pull down resistor Do not apply input signals greater than 3 3 volts to this input RS232 TX RS232 TX is an RS232 level signal used for communications between the recorder and the laboratory computer Operational Software The operational software was written as a menu driven computer operating system utilizing the LabView programming language This chapter is intended as a user manual for the operating system A graphics approach has been taken to describe the operating system Below is a display of each of the screen menu followed by a description
25. e of the test operator The analog channel titles of ChO Ch1 and Ch2 The analog channel titles of Ch3 Ch4 Ch5 and Ch6 This is valid for the VFR2 recorder in Mode 1 The size of the file in K data points The tool bar for the manipulating the data in the display window Displays the full data window in the X direction time 37 LI z S a Batt sage min 0 Batt zj m is Max Temp C EB 0 CH Mode Fast sec 17 0880E 6 Slow sec 138 8848E 3 Displays the full data window in the Y direction magnitude Magnifies the data Pans the data The cursor control Allows grabbing the cursor with the mouse pointer The amount of time the battery was used during the test The starting and ending battery voltage during the test This does not start until the serial link has been disconnected and is sampled every few minutes If the test is too short such as a test where an external T1 pulse turns on the recorder and T2 shuts the recorder down after a short time these values may be O The maximum and minimum temperatures in degrees Celsius which occur while recording data during the test The maximum temperature in degrees Celsius which has occurred during the life of the recorder The Mode of the VFR2 recorder used to collect the data This does not apply to the VFR recorder Displays the Fast and Slow sampling rates of this data file 38 Th
26. ecorder to test calibrate the analog section Recording Recording data indicates the analog section 1s on and the recorder 1s actually storing data into memory When the memory is full the recorder will automatically turn itself off and go into the Sleep mode to conserve power If the recorder is recovered after a test and it is still in the Recording data mode memory was not filled up the Stop button must be pressed before the data can be downloaded Awaiting T1 Awaiting External T1 indicates the recorder is in the Sleep mode waiting for the correct external 3 3 volt pulse on the T1 pin of the recorder to wake it The external pulse is ignored when the serial link is on When T1 occurs the recorder will automatically go into the Recording mode sampling at the slow sampling rate Note If there is a sensor error the recorder will be shut down into the Standby mode So it is recommended that the recorder be put into the Recording data mode on the bench before the test to verify proper operation After the recorder status indicates it is Awaiting External T1 the serial connection can be removed Data Downloading Data transfer for the VFR recorder 1s accomplished using the same menu driven computer operating system that is used to program the recorder The software is a user friendly menu driven program that allows the user to retrieve display and store data records In addition the soft
27. eeeeeeeeeese 28 9 kHz Analog Channel Sample Rate Low Speed 1 7 2 kHz Analog Channel Sample Rate Low Speed 2 1 8 kHz Analog Channel Sample Rate Low Speed 3 seen 45 Hz Analog Channel Sample Rate Low Speed 4 112 Hz Analog Channel Sample Rate Low Speed 5 28 Hz Analog Channel Sample Rate Low Speed 6 eeeeeeeeeeeeeenneneeeeereeeeeccseeeeeeeneeessese 7 Hz Analog Channel Sample Rate Low Speed 7 seen 1 8 Hz Analog Channel Signal Bandwidth selectable 2 3kHz or 9 3kHz Analog Channel Amplitude Resolution eeeeseeeeeeeeeee 256 digital steps Analog Channel Programmable sss Filter8 pole elliptic low pass Total Stora ee Capacity dett ide deo Hs piti ach fuc es 524 288 data words 512K x 8 E xternal TEIpeet 19d mmmmmmmmmmmmmmmmmmmmmmrmmrucac aa 3 0 to 10 0 volt pulse External TriBgset 2 SIBBAL s repo qr ith mem 2 3 to 3 3 volt pulse External Trigger 2 Input Impedance eese 10 000 ohms Internal TIS caren er eer us mls tutes etit Idee id de OTe ese Slope Programmable itemak LISSE cepe cete En DOO DES E idem ounce edid Level Programmable Power UIP PL Feliu M 6 to 15 volts Staind Dy CUNG mM 450 micro amps typical Operatmo CUELECTIE ooi s EIU PEN USA IDE IRE PREND SS 10 milliamps typical Data Retention Cutten
28. have been successfully used are listed below WARNING It is important to prevent any motion of the recorder while in a hostile environment Failure to properly restrain the recorder could result in permanent damage Epoxy Encapsulation This encapsulation provides a rigid method of mounting the recorder to the test fixture and requires the least amount of space The recorder must first be interfaced to all sensors that are to be contained within the encapsulation Provisions must be made for the relocation of the input signals and edge connector pads outside of the encapsulation The recorder is positioned and centered within the test fixture Follow the battery encapsulating procedure to totally encapsulate the recorder within the test fixture The disadvantage of physically locating the components in this manner is the inability to recover the components after the test This procedure should only be used in the cases where the available space will not allow any of the other encapsulation methods Glass Bead Encapsulation The recorder must first be interfaced to all sensors that are to be contained within the glass beads The recorder is positioned and centered within the test fixture The test fixture is filled with glass beads beads with a diameter of less than 0 005 inch work well The test fixture must be constantly vibrated during the filling to insure that all air voids are filled although a vibration table should be avoided if possible
29. he memory size allocated for each channel is display on Page 1 Two memory sizes can be selected Either 32K data points or 512K data points The advantage of using 32K is when battery power is crucial The smaller memory size will fill up more quickly conserving battery power This determines the analog filter for all the programmable channels The two selections are 9 25 KHz and 2 3 KHz 22 Controls for the External T1 signal The width of the external 3 3 volt T1 pulse required to wake the recorder from sleep and start it recording data can be selected The pulse can range from a simple positive edge 0 milliseconds up to a minimum pulse width of approximately 2 55 seconds If the pulse goes negative during this the pulse width counter may reset itself If Quick Startup is disabled the normal analog warm up and Auto bias at Start if enabled occurs but this can up to several seconds and data will not be recorded until this is completed If Quick Startup is enabled the normal warm up and Auto bias at Start are ignored allowing a much quicker turn on time Note If disabled there may be garbage data at the beginning of the file until the analog section and sensor has had time to stabilize This section is used to program the gain and bias level of the sensor Note The CHANNEL DATA on Page 3 must be read first to properly display the High and 29 EXER
30. imes when the cursor is moved When Show Slow Data Only is selected only the Slow Speed data is displayed When there is a High Speed event it is represented as a single spike of date with the correct magnitude 41 EE lI C ale T z A E Note When the Show Slow Data Only is selected the time is calculated using the Slow Speed sampling rate when the cursor is moved The digital data is displayed both in an analog graph and m UE 7 as indicators The cursor ligital 0 eas fe position peter elon indicators are lit based on the digital values This graph shows the digital activity for the data window currently displayed The red signal is Digital channel 0 and the green signal is Digital channel 1 Digital channel 0 contains the recorder s internal signals LOW indicates the recorder is sampling data in the Slow Speed rate HIGH indicates the recorder is sampling in the Fast Speed rate uP OK indicates no internal reset occurred during the test This should lit at all times When lit this indicates that an external T1 pulse has occurred When lit this indicates that en external T2 pulse has occurred 42 T2 Link off 1 i co LOW Saeed Note If the T2 pulse is too narrow this indicator may not light This is the latched T2 pulse indicator This also lights when an externa
31. is is the display window for the data The top window shows the analog data The window below it shows the digital data represented in an analog type of display The two rows of indicators show the um D actual digital lines as ems pat the cursor is moved CHO WICH OCH sS CH i m l mico Mc Hi T E around in the window Cursor These buttons determine which data channels are displayed on the graph CH3 to CH6 are valid for only VFR2 Mode The amplitude scale for the current selected data channel is displayed here The colored bar on the left indicates the channel which has been selected In this case channel 0 the red channel is the scale which is shown 39 ag reer 46 1009E 3 306 731E 0 18 This section is used to control the cursor The button must be pressed to put the graph in the cursor mode Picking it with the mouse then can move the cursor This button determines which channel the cursor is active with and which amplitude scale is displayed If the data window was zoomed and the Cursor has disappeared press this button to bring the cursor back into the currently displayed window The cursor can be moved with the mouse or my pressing these buttons The inner blue buttons will move the cursor by one data point The outer green buttons will move it by 100 data points at a time As the cursor is moved the current data
32. its the Data Display section of the program 46 Encapsulation Encapsulation is important for shock survivability The general rule for shock survivability is if it can move it will break Once the recorder or a battery pack is constructed and tested it should be stabilized using an encapsulation compound The Epoxy casting section below describes the procedure used for the encapsulation Having encapsulated the recorder and battery an additional encapsulation is required to physically locate the recorder within the test fixture fill all of the voids and prevent any motion during hostile tests This second encapsulation is described below in Recorder Packaging section Epoxy Casting The compound selected for the VFR 1 and the batteries is a epoxy casting resin manufactured by _ A suitable mold should be constructed out of nylon or Teflon to yield the desired final shape The mold should also include an overflow chamber for expansion of the encapsulating compound during the de aeration process Compound Formulation The casting compound is formulated from the materials listed below taken in the requisite proportions on a weight basis The tolerance on weights of materials is 2 percent Maximum batch size is 90 grams Mold Preparation The mold or housing should be clean and free of contaminants When the mold is not an integral part of the component it should be cleaned and coated with a suitable mold release agent and al
33. l balancing the sensor or reducing the gain for that channel This error could also indicate a bad sensor or sensor wire 11 This is the main section for controlling the T ofl Battery Test recorder f Clear Errors E T1 Start Clears any Error Status or Sensor Error Status warnings and silences the beeping If the errors are not cleared with this button there is a more serious problem with the recorder These indicators flash to remind the User to READ SETUP on page 2 of the Main program and READ CHANNEL DATA on page 3 of the Main program This is VERY important to do as soon as serial link has been established with the recorder This allows the User to verify the current settings programmed into the recorder s EEPROM These will usually flash when the recorder is first connected to the serial port Note Data can still be downloaded even if the READ CHANNEL DATA or READ SETUP indicators are flashing Version 40 2 About J Sleeping indicates the recorder in the low vrRz0016 current mode It will draw 10 14 mA while the serial link is connected When the serial is Sleeping disconnected the recorder will draw under 500 uA and will be dormant The recorder can be programmed and data downloaded while the serial link is connected but the analog section will remain off 12 Version 4 0 2 About VFR2 0016 fl Battery Test 26 CH BitVal
34. l T2 pulse occurs so if the pulse is too narrow to be recorded by the T2 indicator the User will still know that an external T2 occurred It will turn off after the recorder goes back into the slow Speed mode Indicates the serial link is not connected to the recorder Indicates the serial link is connected to the recorder Always OFF Always ON Som poem TS 5 FS To il a Channel 1 contains the 8 User defined digital channels OFF indicates a low signal and ON indicates a high signal Indicates at the current cursor position the data was sampled at the Low Speed rate Indicates at the current cursor position the data was sampled at the High Speed rate 43 Show Slow Data Only Show Multi speed Save Display ta Ascii File Read File Save Filg show Slow Data Only Show Multi speed Save Display ta Ascii File This section controls the reading and saving of that data file converting the data to an ASCII data file changing the current channel settings and viewing the test setup and displaying the data in High Slow speeds When Show Multi speed is selected all of the data is displayed both the Slow Speed and High Speed data points Note When the Show Multi speed is selected only the High Speed sampling rate is used to calculated the times when the cursor is moved When Show Slow Data Only is selected only the Slow Speed data is
35. lowed to dry Container Preparation All mixing or handling containers should be clean and moisture free WARNING The components of the casting compound may be toxic Hence adequate ventilation should be provided in the han dling of the components to prevent exposure to vapors Ingestion or skin contact with these materials shall be avoided If accidental skin contact should occur the exposed areas should be washed immediately with soap and water 47 Compound Preparation For best results during the subsequent de aeration step use a container whose diameter is approximately equal to its height and whose volume is at least four times the volume of the mixed compound The requisite amounts of each component should be combined in accordance with the following procedures Remove the from the refrigerator and allow them to warm to room temperature This should be done at least 24 hours in advance Mix the entire contents of the container to a uniform consistency During shipment and storage the low density filler may crust on the top This is normal and it must be remixed for proper results Weigh the desired amount ol into a clean container Castings requiring more than 75 grams of should be done in steps to minimize the heat from the exothermic reaction Weigh an amount of into another clean container Add the and mix thoroughly Compound De aeration As soon as the mixing is complete the mixture should be placed in a vacuum
36. n nnn n nnne 9 Pa e of tbe iam Ie eost omo 5 hasan eetue etna ccs conde det ae eau cc ud acabe 9 lcu s Ore MaE NIONU E AE T 20 Page 01 VCs VIG eria mai iiirmiinmmheimiiiminiirmas 31 VER Software Program Display Data cccccsssesssssseeeeseeeeeeeeeecceccesenenaaassssesees 35 BN CADSUlAMOM ennan e a a A O OA a 47 Epoxy CIUNE aioa a P 47 Compound F OMIA Oese ansa T T AAT 47 Mold PrepdtatiOD voee chia cn tate ET A T oun DU dep nd Eds 47 Container Prepari oie oso O TO EE 47 Compound PreDarablOfi mm mmmmmwwwuwwvwwewwwuwwwvvwwvwwvvwvwwuvwvwwwvwvwvwvvwwevwewvwvvvvv 48 Compound De aefatlotk xoxo T eles 48 omnpound APPlICAOM ssk a GHABHA dA Hi be Tdv 48 Compound C Ure ctc C M 48 Recorder Packa noster teda ebbe tide indiiuobli oet ta dese edea nae 49 Epoxs BneapsulallOti emi sette otn DR Adr NO c Meets tu i pelea vaewe es MacsmueR ei 49 Glass Bead B capsulatiOtkss iieuoie bois etx EO g eu Pho e eta period b RR tait o e Dletlav tede etum ihs 49 Para titi Encapsuldtlobli ss Stout oak occas eid M EU ud 49 ADD S are te Me Nem mee Iovem ded mv ED dme MM ePi d Ud 51 I xample V EI SCHUNS enti oin ena godut ener eee erin Sena oe ee ee neem Ste aay a 51 Fata 015 6 6 0 b eee ome ee im e e oi DEI A nee eee 56 VER 1 Signal LOGCOUOtSu cierto etes toot oae net eas etae E eade a vede mass 56 VFR 1 Overview The VFRI is a reusable compact high shock solid state recorder designed to acquire data in hostile test envi
37. nnels Bin E Endeves 8511 DB Tithe EE D4 Title ensor Seria i l CH1 Sensor Units ES ps wg cas CH1 Sensor Sensitivity 0 0246 3 Benin Db Tithe CH1 Sensor Excitation 10 D3 Title D Title CH1 Units per Bit CH Zero Level Bit 31 When the recorder is first connected to the serial link the READ CHANNEL DATA indicator will blink This is a reminder to press the READ Channel Data button to read the channel information which have been stored in the recorder s EEPROM The Channel Data must be read from the recorder before the entered values can be changed and saved Note Press the READ Channel Data before putting the recorder in the RECORDING mode to ensure the proper data has been entered After the Channel Data on this page have been entered or edited it must be programmed back into the recorder s EEPROM before it will take affect Once programmed it will not change unless this button is pressed again The battery can be removed and the Channel Data will not change The message below appears when this button is pressed to verify that the User really wants to change the EEPROM settings Note When the Program Channel Data button is pressed the button will blink and the Serial Link indicator will stop blinking while the EEPROM is being programmed This will take several seconds When finished the Serial Link indicator will start blinking again If a Serial Error
38. o program the recorder for either the standard G switch triggering and or an auto triggering mode In the auto trigger mode the micro controller monitors the recorder channel zero output and generate a trigger 2 signal when the signal crosses a bit threshold The bit level selection for triggering the recorder when in the auto trigger mode is programmable by the user so the level can be changed between tests or it can be disabled The auto trigger allows the recorder to be triggered in the same manner that a laboratory oscilloscope is triggered If a G switch is attached to the normal trigger pads the recorder is triggered by the first signal generated either the G switch or the auto trigger The G switch cannot be disabled it must be removed to prevent it from triggering the recorder Recorder Operational Modes Sleeping Sleeping indicates the recorder is in the low current mode It draws 10 14 mA while the serial link 1s connected When the serial is disconnected the recorder draws under 500 uA and is dormant The recorder can be programmed and data downloaded while the serial link 1s connected but the analog section remains off Standby Standby indicates the analog section of the recorder 1s powered but data 1s not being stored into memory This mode is useful for measuring the data collection current of the recorder because the sensors are powered in this mode Also the analog outputs are active so signals can be connected to the r
39. programmable analog channel and 2 buffered analog channels Displays the current high speed and low speed settings which are programmed into the recorder 16 Controls the downloading of the data after the test If the recorder is still in the Recording Data mode the STOP button must be pressed first to stop the data collection This will put the recorder into High speed until the memory is full Note The data will remain valid in memory until either power is removed from the recorder or the START button is pressed Also data can still be downloaded even if the READ CHANNEL DATA or READ SETUP indicators are flashing and do not need to be read before downloading the data Downloads ALL the data in the recorder Either 32K or 512K data points depending on how the recorder was programmed When downloading this operation can be canceled If there is a problem while downloading such as a parity error the User will be warned and the data can be downloaded again Sometimes when data from a test is written into memory not all the memory is used In that case the recorder indicates the Valid Memory Size By pressing the Quick Download button only the memory which was used during the test is downloaded This reduces the time required for downloading If there are any uncertainties the User can simply download ALL the data by pressing the Download ALL Data button 17 if Downlo
40. r down one bit at a time This feature should be disabled when using single ended inputs This section controls the time functions and speed modes of the recorder including the minimum time to sample at the Fast sampling rate the length of time the recorder is forced to sample at the Slow rate after a High speed event occurs and the speed mode for collecting data After a trigger event from either the Auto Trigger or an external T2 pulse occurs the recorder is switched into a Fast sampling rate Even if the trigger event instantly disappears the recorder will stay in the High Speed mode for at least the time chosen by this switch up to a maximum time of 255 milliseconds The minimum time is 5 milliseconds This guarantees that there will be High Speed data collected for a minimum length of time 28 After the recorder is trigger into the High Speed mode it could stay in that mode as long as the signal was above the Auto Trigger threshold This may not be desired so by setting this switch to a certain number of seconds the recorder will be forced back into the Slow sampling rate for at least the time selected If the value is set to O this switch is ignored and the recorder will stay in the High Speed mode as long as the signal is above the Auto Trigger threshold Note An external T2 pulse will override this switch setting It is also ignored when the serial link is connecte
41. rded 30 Page 3 of the Main Menu This is the third page of the VFR Main Program You can get to this screen by sliding the bar at the bottom of the screen or clicking just to the right of the bar with the mouse arrow This page is used to read and program the recorder s Channel Data and miscellaneous information concerning the test The Channel Data must be read first before any changes can be made These settings are stored in EEPROM and will not be erased if power is removed Note The Channel Data information on this page should be read first before adjusting the Trigger Level or selecting the sensor High Range and Low Range found on Page 2 The Sampling Time Sensor Sensitivity and Sensor Excitation MUST be entered correctly for proper operation of the recorder Iii VFR Main VI vi bas Sample time i7 0886 6 a CH Title X Axis Gun Test 1 CH2SensorModel Endevco 8511 TestDate M1538 CH Sensor Serial ABS CH Sensor Units PSI Operator s Mame UohnDoe CH Sensor censitivity 0 0246 3 CHO Title 7 Axis CH2 Sensor Excitation 10 CHO Sensor Madel s Endevco 8511 CH2 Units per Bit CHO Sensor Serial AB CH2 Zero Level Bit jt CHO Sensor Units ES HC Analog Ch3 Analo CHO Sensor Sensitivity 0 02463 ED s cree CHO Sensor Excitation 10 T DEAE CHO Units per Bit CHE Title Ch5 Analog CHO Zero Level Bit CHE Title CHE Analog CH1 Title Y Axis A EE Digital Cha
42. ronments The epoxy encapsulated unit was designed to fit inside of a general purpose bomb fuze booster cup By installing the recorder in the place of the fuze booster and lead the user 1s able to record the impact acceleration event as well as several analog and eight digital events The VFRI can be programmed for various trigger modes filter frequencies sample rates amplifier gain and amplifier bias All of the programmable features are available to the user through a menu driven computer operating system operating in a Windows environment On line computer aided assistance is available to the user when setting up the amplifier gain and bias The user has a visual display of the recorder range and zero settings rather than relying on calculations Low power consumption allows the test instrumentation to be built weeks before the test and extends the time for data retrieval After a test the recorder data is retrieved using a personal computer and the same computer operating system that is used to program the recorder Specifications Electrical Number of Programmable Analog Channels cccccccccccccccccececeeeseeseeeeeececeeeeeeeeeeeeaaaas l Number or Buttered Analog Cannel Saanio b A Neues 2 AN mberor Detale Hanne mmmmuwvwwwwvmwwwvvwvvvvvvwwvvvwvwvvvwvvmvvvvwwwvwvvwvvvvvvmvvvvvv 8 Analog Channel Sample Rate High Speed assassinaram 57 8 kHz Analog Channel Sample Rate Low Speed 0 eeeeeeeeeeeeneeeeeeereeeeeeceee
43. ry manager Copyright 1991 1994 Arthur D Applegate All Rights Reserved Allows the selection of the serial port for communicating with the recorder The choices are COM1 COM2 COM3 and COMA If the proper port has been selected and communication has been established the LINK OK will turn on and the Polling indicator will flash on and off 10 NO RESPONSE The recorder cannot be found No serial link can be established Possible NO LINK causes are no power to the recorder a bad cable connection or the wrong serial com port is selected Allows selection of different baud rates Note This is the default value and should not be changed Occasionally when first connecting the recorder to the serial port a SERIAL ERROR can occur A beep will be heard This is OK unless the recorder continues to have error problems It could indicate more serious problems such as loss of serial link or a problem with the recorder Other errors can occur under Error Status If this occurs there is a serious problem with the recorder EE fa Sensor Error occurs it means the o Channel Auto Bias at Start was enabled for the channels displayed and the recorder was unable to set the Sensor bias when the START button was pressed The recorder will not start recording data until the problem is corrected Possible solutions are disabling the Channel Auto Bias at Start for that channe
44. s section controls the Auto Trigger of the recorder When the recorder is recording data it samples at the Slow sampling rate When an external T2 or auto trigger occurs the recorder is put into a High sampling rate for a certain length of time Note An external T2 pulse will put the recorder into a High sampling rate even if no auto trigger occurred or the auto trigger is disabled Enables the Auto Trigger If enabled and the signal exceeds the trigger level the recorder is put into a High sampling rate If disabled the Auto Trigger is ignored and the only way the recorder will go into High speed is if an external T2 pulse occurs Note An external T2 pulse overrides the Auto Trigger Determines which channel is used as for the Auto Trigger For the VFR1 recorder only channel 0 is allowed The VFR2 recorder can use channel 0 1 or 2 25 Trigger Level above Bias o 3a a TD 0 100 255 Auto Trigger Point Above Starting Bias Above Floating Bias Trigger Value Above Floating Bias The Auto Trigger level can be set by sliding the bar switch or typing in the value desired The range is 0 to 255 The trigger point is the entered value above the bias line of the analog output It requires a positive going signal to cause a trigger IMPORTANT The sensor sensitivity and excitation voltage for each channel must be entered on Page 3 before these values will be
45. tting for this page are stored in the recorder s EEPROM and must be Read before changes can be made and programmed back into the recorder Note Press the Read Setup before putting the recorder in the RECORDING mode to ensure the proper settings have been entered After the settings on this page have been selected they must be programmed back into the recorder s EEPROM before they will take affect Once programmed they will not change unless this button is pressed again The battery can be removed and the settings will not change The message below appears when this button is pressed to verify that the User really wants to change the EEPROM settings 21 Are your sure you wantta PROGRAM THE RECORDER SETTINGS PREVIOUS RECORDER SETTINGS wILL BE ERASELII CONTINUE ABORT If blinking the recorder is communicating properly with the program It will stop blinking when the software is programming the recorder and resume when finished If is stops inspect the power supply and the serial cable This determines the mode of operation for the VFR2 recorder In Mode 0 there are 3 programmable analog channels that are active CH 0 1 2 and 8 digital channels In Mode 1 there are 3 programmable analog channels and 4 buffered analog channels that are active and 8 digital channels The VFR 1 recorder has only one mode which is 1 programmable analog channel 2 buffered analog channels and 8 digital channels T
46. tware program and returns you to Windows 19 Page 2 of the Main Menu This is the second page of the VFR Main Program You can get to this screen by sliding the bar at the bottom of the screen or clicking just to the right of the bar with the mouse arrow This page is used to read and program the recorder s operational settings The setup must be read first before any changes can be made These settings are stored in EEPROM and will not be erased if power is removed Note The Channel Data information on page 3 should be read first before adjusting the Trigger Level or selecting the sensor High Range and Low Range These values are based on the sensor s sensitivity which is located on the third page IH VFR Main VI vi Slow Speed ONLY Multi Speed Slow gt Fast Speed Program Recorder 20 Frogram Recorder Frogram Recorder F These two controls are used to read and program the settings to the recorder s EEPROM found in this window Note Even after power is removed from the recorder the settings will be retained When powered back up the same settings will appear When the recorder is first connected to the serial link the READ SETUP indicator will blink This is a reminder to press the Read Setup button to read the settings which have been stored in the recorder s EEPROM The current settings must be read from the recorder before they can be changed and saved The se
47. ue 78 CH1 BitValue 113 CH2 BitValue Version 4 0 2 About VFR2 0016 STOP will put the recorder into the SLEEP mode if it is currently RECORDING data in STANDBY or AWAITING T1 If the recorder is already in the SLEEP mode nothing will happen NOTE If the recorder is currently RECORDING data the STOP button MUST be pressed before any data can be downloaded Standby indicates the analog section of the recorder is powered but data IS NOT being stored into memory This mode is useful for measuring the data collection current of the recorder because the sensors are powered in this mode Also the analog outputs are active so signals can be connected to the recorder to test calibrate the analog section Pressing this button will put the reocrder into the Standby mode If the recorder is in the Recording data mode this button is ignored When in the Standby or Recording modes these indicators display the analog outputs 0 255 bits of the amplified analog channels In the Standby mode these values will float towards zero Recording data indicates the analog section is on and the recorder is actually storing data into memory When the memory is full the recorder will automatically turn itself off and go into the Sleep mode to conserve power If the recorder is recovered after a test and it is still in the Recording data mode memory was not filled up the
48. waiting External T 1 the serial connection can be removed INFO The recorder will start recording data when the START button is pressed in the lab This will work in most test applications 14 T1 Start Battery Current Temp cL F3 91 Max Temp because the recorder is collecting data at a low speed until an external T2 occurs or the auto trigger is activated But certain tests require low current and the recorder may remain dormant for long periods of time such as a sled track test This requires the recorder to be in the SLEEP mode until woken by an external 3 3 volt signal T1 The width of the T1 pulse required to wake the recorder can be selected on Page 2 The T1 Start button will put the recorder into the Awaiting External T1 mode Pressing the Stop button will turn this off and put the recorder back into the Sleep mode Displays the current battery voltage A good way to determine the strength of the battery is to apply a load to it Pressing the Battery Test button can do this This turns on the analog section the recorder and which loads down the battery The LOW BATT indicator blinks when the battery voltage is below 5 0 volts It is highly recommended that a new battery be used if this occurs The recorder monitors the battery voltage during a test and if it falls below a safe limit the recorder is put into high speed and is shut down to conserve
49. ware enables the user to magnify portions of the data record and with a cross hair obtain timing and amplitude information and print the display Interface Signals Location and Description Figure 3 illustrates all of the VFR1 signal locations Following is a description of each input output signal DIG 0 to DIG 7 Digital channel inputs with CMOS inputs impedance Do not apply a voltage greater than Vcc or less than 0 volts to these inputs CH 0 Non inverting input to the channel 0 differential amplifier This signal is connected directly to the non inverting input of an operational amplifier Do not apply a voltage greater than Vref or less than 0 volts to this input CH 0 Inverting input to the channel 0 differential amplifier This signal 1s connected directly to the inverting input of an operational amplifier Do not apply a voltage greater than Vref or less than 0 volts to this input osc our e a our lon Vec OOOODO S o oo OOOoOoooo onn FEFEFE FEF OD th M gt di x I D Ea Ba g m p p p buain ALLEE Fa t Mh Figure 3 VFR 1 Input Output Signal Location CH 1 IN Non inverting input to the channel 1 operational amplifier This signal 1s connected directly to the non inverting input of an operational amplifier Do not apply a voltage greater than Vref or less than 0 volts to this input CH 2 IN Non inverting input to the channel 2 operational amplifier This signal 1s connected directly to
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