DIT-5200L User Manual
Contents
1. To avoid variations caused by temperature changes of the target use the recommended minimum target thickness in the table below www kamansensors com PART NO 860522 001 Last Revised 5 14 2015 KAMAN Precision Products Measuring Thickness mils mm Gold and Copper Beryllium 17 0 43 Aluminum Brass 300 Series Stainless Steel In applications where the sensors oppose each other with the target between them the minimum thickness should be at least double those listed above to prevent sensor interaction Target Size The minimum target size must be 1 to 2 times the sensor diameter It is preferred that the target size be 3 times the sensor diameter for optimum performance SENSOR FIELD 3 TIMES SENSOR DIAMETER 3xd Figure 7 Sensor Field Size Additional recommendations and guidelines can be found in Kaman s Inductive Technology Handbook The latest copy of this reference guide is located on our website www kamansensors com PART NO 860522 001 Last Revised 5 14 2015 10 KAMAN Precision Products Measuring PART 4 CALIBRATION The DIT 5200L systems are shipped from the factory pre calibrated for a user specified measuring range sensitivity and target material They do not normally require calibration or re calibration Potentiometer locations for the OEM and enclosure version are the same relative to the sensor and I O connector positions The system must be positioned to the null gap b2. Full Range 2 x 500 microns 1 000 microns Step 2 Calculate the Equivalent RMS Input Noise in measurement units by multiplying by the Full Range don t forget to divide by 100 to take into account the percent Resolution at Full Scale is 2E 5 FR VHz x 1 000 microns 100 2E 4 microns VHz Step 3 Multiply by the square root of the measurement bandwidth to calculate the effective resolution Effective RMS Resolution 20kHz 2E 5 FR VHz x 1 000 microns x V20 kHz 0 028 microns Step 4 To approximate the peak to peak resolution multiply by 6 6 Effective peak to peak resolution 20 kHz 0 028 x 6 6 0 185 microns Note Output filtering on the DIT 5200L is set to 20 kHz External filtering is assumed when calculating resolutions at lower bandwidths www kamansensors com PART NO 860522 001 Last Revised 5 14 2015 14 KAMAN Precision Products Measuring PART 6 TROUBLESHOOTING 5 1 Insufficient Gain If attempting to recalibrate for a specific sensitivity measuring range or for a target different from factory calibration specifications there may be insufficient gain control to do this You may need to decrease the desired output in order to calibrate the system Another cause for insufficient gain could be excessive loading of the sensors by conductive material other than the target within the field of the sensors The sensor s field is approximately three times its diameter 5 2 Unable to Zero The DIT
3. of non contacting sensors The DIT 5200L is identical in form to Kaman s previous DIT 5200 product Enhancements have resulted in lower noise better resolution and CE Marking The DIT 5200L uses advanced inductive measurement technology to detect the aligned or centered position of a conductive target For differential measurement applications two precisely matched sensors per channel are positioned on opposite sides or ends of a target In this sensor to target relationship as the target moves away from one sensor it moves toward the other sensor an equal amount Output is differential and bipolar Electrically matched sensors on opposing legs of the same bridge provide exceptional thermal stability J OSCILLATOR DEMODULATOR SAEM A B TARGET SENSORS Figure 1 DIT 5200L Circuit The DIT 5200L signal conditioning electronics is packaged in a die cast aluminum box with MCX style sensor connections The Input Output I O is on a 9 pin mini D connector The input power connections are reverse voltage protected The electronics can also be supplied as a bare PCB for installation inside the user s enclosure Custom configurations can also be designed for OEM application requirements The DIT5200L is CE Marked when purchased in the original enclosure To maintain the CE Marking a ferrite bead Supplied must be installed over the input power wires only on the I O cable www kamansensors com PART NO 860522 001 Last Revised
4. sensors field Because the sensor field radiates in all directions excessive back loading can also be a problem 3 3 Electrical Nulling Procedure NOTE This procedure could result in one sensor having a less than specified NULL Although both sensors may appear to be positioned mechanically this can cause a cumulative error By electrically positioning the second sensor using the system output the error is minimized The sensor coil is mounted at the face of both sensors For purposes of mechanical nulling measure distance from the sensor face Use care not to damage the sensor coil 1 Sensor position relative to the target is critical Make sure the target is in the null position Install the first sensor of a pair start with X in the application fixture Using a dimensional standard precisely locate the sensor at the null gap Secure the sensor and recheck its position 2 Now install the second sensor of the pair X in the fixture and position it to within a few mils 10 s of microns of the required null gap Connect the Power Signal line and apply power to the system The system must be energized for a minimum of 30 minutes for best results Use the output from the system as a guide in the final positioning of this sensor electrical nulling Slowly move the second sensor toward or away from the target as necessary until the system output reads OVDC typically 10mV Secure the sensor and recheck that the output is OVDC T
5. temperature characteristics such as Invar or other substrates as long as the target thickness guidelines are observed Invar is an excellent target substrate as it has a very low expansion coefficient with temperature The figure below shows aluminum tabs which give optimal performance from the DIT 5200L mounted on and Invar fixture Iron nickel and many of their alloys ferro magnetic targets can be used with the DIT 5200L Performance to these materials may not meet standard performance specifications Refer to the DIT 5200L data sheet for performance specifications to aluminum INVAR ALUMINUM TAB a TARGET MOTION Figure 6 Attachment of Aluminum Targets If the system was purchased for use with a target material other than aluminum it has been pre calibrated with pre selected component values at the factory using that specific material Changing the target material will require re calibration and or cause the DIT 5200L to malfunction The effect of target material is due to the resistivity and mainly affects the sensitivity of the system Expect about twice as much noise and drift on a system set up for a stainless steel target as compared to one set up for aluminum Target Thickness The RF field produced by the sensor is maximum on the target surface but it also penetrates below the surface The depth of penetration depends on the target material used For example the RF field will penetrate aluminum 0 018
6. 5 14 2015 KAMAN Precision Products Measuring PART 2 CONNECTING THE DIT 5200L 2 1 What s Included e DIT 5200L Signal Conditioning Electronics e 2or4sensors Typically 15N or 20N e 18 Input Output Cable 2 2 Cautions and Safeguards The sensor faces may be damaged if allowed to strike the target or other hard surface Protective plastic caps should remain in place until the sensors are ready for installation The maximum input voltage to the DIT 5200L is 15 5V exceeding this input voltage will cause damage to the DIT 5200L 2 3 Pin out and Connector Assignments The DIT 5200L I O connections are via an ITT Cannon model MDM 9SL2P connector on the enclosure A mating connector with 18 inch leads is provided as part of the system Connection information is detailed below a Color Black 15V 40 mA typical typical O Power Supply PIN Oo PIN 6 Common OF PIN S loc PIN 9 6 Green YOutput 8 Vidt UN 9 Gray NE Figure 2 I O Connector Sensor connections are the same for both the enclosure style and the OEM DIT 5200L On the OEM DIT 5200L orient the box so the I O connector is on the right and the sensor connections are on the left www kamansensors com PART NO 860522 001 Last Revised 5 14 2015 KAMAN Precision Products Measuring Sensor Label wenn i s DIT 5200 f E Figure 3 Sensor Connections The output on the channel will become mo
7. 5200L is an exceptionally stable measuring system Long term drift is less than 2 micro inches per month If the unit does not work this would most likely be discovered during the functional test If you are unable to calibrate your system in no more than two iterations the problem is most likely poor mechanical repeatability in the fixturing or actuating mechanisms To determine this 1 Do not make any adjustments to the calibration controls Record how much time the next step takes 2 Doat least 12 to 15 iterations of moving the target from null to full range and back to null Record the output at null each time If successive readings of the output at null consistently vary with no clear trend drift in one direction or the other the problem is mechanical repeatability 3 Stabilize the target at null and record the output Leave the target at null for the same length of time it took to accomplish step two and monitor the output 4 If the output remains constant this confirms the problem is mechanical repeatability If the output drifts the problem could be drift in the fixturing drift in the target positioning servos or drift in the DIT 5200L If you can positively eliminate all other variables as the source of the problem consult Kaman Precision Products 5 3 Poor Non Linearity Poor non linearity is typically the result of additional loading on the sensor or the sensor head being slightly tilted www kamansensors com PART
8. KAMAN Precision Products Measuring DIT 5200L Non Contact Displacement Differential Measuring System User s Manual This apparatus when installed and operated per the manufacturer s recommendations conforms with the protection requirements of EC Council Directive 89 336 EEC on the approximation of the laws of the member states relating to Electromagnetic Compatibility Refer to the DIT 5200L Declaration of Conformity or contact Kaman Precision Products for details Copyright 2015 Kaman Precision Products PART NO 860522 001 A Division of Kaman Aerospace Corporation Last Revised 5 14 2015 217 Smith Street Middletown CT 06457 ww kamansensors com KAMAN Precision Products Measuring Table of Contents PART 1 INTRODUCTION siesicsices ccvinsties cectsensdres REEERE Rri EES 3 PART 2 CONNECTING THE DIT 5200L erinan E EN ASE 4 2 1 VAL SGI OCD iceanccocseatinsmaae anaieteeastaseneearne EEE A E ENEE SE Na 4 2 2 Cautions and SafeguardS essseseeseerrersssserrrrrrrrsssssrrerrrrsssssrrirrtrrrsssserrieeresssserereeresssss 4 2 3 Pin out and Connector Assignments ccccccccccccccesesssssceeeeccceceesssssceeeeceeeeserstsseeeeeees 4 PART 3 APPLICATION INFORMATION ccccccccecceee eee eeseeeeeeeseneneeeneceeeeeeeeeeeseneseneneeeaees 6 3 1 Fixturing oo ccccccccccccceccceeeessessesssssneeeeeeeeeeccecceceseeseeeesetesssceeeeeeeecececeseeeeeeeeestttttnsaaaees 6 3 2 Sensor Mounting and Installat
9. NO 860522 001 Last Revised 5 14 2015 15 KAMAN Precision Products Measuring APPENDIX A DIT 5200L SENSOR DIMENSIONS 0 188 in 1 075 in 0 822 in 0 822 in he Up 3X ACTUAL SIZE BELLEVILLE Lat SPRING WASHER THREAD 4 40 UNC2B OPTIONAL 004B total length 0 506 15N Sensor Versions 20N Sensor PART NO 860522 001 www kamansensors com Last Revised 5 14 2015 KAMAN Precision Products Measuring APPENDIX B DIT 5200L ENCLOSURE VO CONNECTOR MINIATURE 9 PIN 10 32 tap 8 32 clearance Standard enclosure Note Single channel systems use the x axis sensor connectors 64 0 141 35 9 2 52 ji 60 0 ma 1524 Note All dimensions shown in inches mm DIMENSIONS www kamansensors com PART NO 860522 001 Last Revised 5 14 2015 17 KAMAN Precision Products Measuring APPENDIX C TERMINOLOGY Null Gap The point at which a target is equidistant from each sensor of a differential pair The system output at null OVDC The actual gap is measured from the sensor face to the corresponding target face and includes a required offset null gap offset plus maximum measuring range Offset The minimum distance between the sensor face and the target Offset is necessary to both prevent the target from striking the sensor face and to optimize performance off
10. alent RMS Input Noise level of 0 2nm VHz results in a system with an effective resolution of 0 2nm VHz x v100 Hz or 2nm www kamansensors com PART NO 860522 001 Last Revised 5 14 2015 18
11. bring the output voltage up or down by half of the difference noted in Step 4 i e Actual output is 9 500 Difference of Step 4 is 250 Adjust output up to 9 750 Note Since the gain is being increased to bring the 9 500 to 9 750 the value of the FS will also increase 6 Check balance between FS Negative Full Scale and FS Positive Full Scale i e Actual Outputs 10 250 250 high and 9 750 250 low Output Span 10 250 9 750 20 000 Vdc 7 Slight adjustments can be made to the Gain control if necessary to improve the balance www kamansensors com PART NO 860522 001 Last Revised 5 14 2015 42 KAMAN Precision Products Measuring PART 5 GENERAL SPECIFICATIONS amp TYPICAL PERFORMANCE Target Material Aluminum Spo Most conductive materials can be preferred considered Null Gap See Data Range and sensor dependant Sheet See Data Sheet Range See Data See Data Sheet Sheet Output Voltage 10 Volts Typical Non 5 FSO Typical rn at Null T 004 FSO Typical p p at 1kKHz BW Resolution at FSO lt 0 015 FSO Typical p p 1kHz BW ae at Null lt 0 005 FSO C Typical ee at FSO FSO PC Typical Power Dissipation at 15N lt 0 5 mW sensor Typical sensor Head Power Dissipation at 20N lt ee Kitai E Sensor Head Power Dissipation a 35 kanad Electronics Frequency Response Weight SE eae Enclosure Version Typical Operating Temperature e Electronics 32t
12. his output indicates the sensor is positioned correctly 3 Repeat steps 1 and 2 for sensor Y and Y The system is now ready for use www kamansensors com PART NO 860522 001 Last Revised 5 14 2015 KAMAN Precision Products Measuring 3 4 Optimizing Performance There are several things to be aware of when using the DIT 5200L in order to optimize the performance of the system e Insure that there are no incidental targets i e targets that the sensor may see that are not to be measured e Insure that the sensor is not tilted with respect to the target as this will cause additional non linearity e Make sure that the system is set up with the proper null gap electrical nulling of the second sensor in a pair is best e Insure you are using the specified calibration material aluminum is the standard e Make certain that you are using stable fixturing and mounting of the sensors e Ensure the target is 3 sensor diameters in size and is thick enough to prevent penetration of the magnetic field reference section 3 6 on Targets e The system will perform the best if both sensors are in a similar thermal environment avoid temperature differentials between the sensor pairs 3 5 Factors That May Degrade Performance Unequal Loading This refers to an unequal amount of conductive material within the field of one sensor as opposed to the other sensor in the pair the sensor s field is approximately three ti
13. ion cc cccccssssssseeeseeccceessssssseeeeeceeesessssseeeeeees 7 3 3 Electrical Nulling ProCeCure uu cece ccccccccccccccccceessssesssssssssceeeeeeescceeceeeeeeeeeseestttstsaaaees 7 3 4 Optimizing Performance 0 occ eeeecccccccccccessssssscceecccecessssssceeeesccccesssssscseeeeeceeeessesstseeeeeees 8 3 5 Factors That May Degrade Performance i ccccceesccceccceceesessssnseeeeececeesssessseeeeeees 8 3 6 Target Characteristics wsiaisseteacicttesnstten waned naventetsindopaaieactnonncasenanasegeledsimcestats Sp orsetaecvands 9 PART 4 CALIBRATION Ce en ee ee ar a ee ea ee ree 11 PART 5 GENERAL SPECIFICATIONS amp TYPICAL PERFORMANCE cccccceceeeceeeeeees 12 PAO TROUBLESHOOTING resect eect nec atc eee cee reais 15 APPENDIX A DIT 5200L SENSOR DIMENSIONS o oo cecc ccc eee eee eeneeeeenesseeneeeeeeeaeees 16 APPENDIX B DIT 5200L ENCLOSURE DIMENSIONS ccc cece eeceeeeeeeeeeeeeseeeeeeneees 17 APPENDIX C TERMINOLOGY rescore eete cree cee eertve rc eevennerace esttaneavernnrrnias geri nieeaeieetoeecse seventeen 18 www kamansensors com PART NO 860522 001 Last Revised 5 14 2015 KAMAN Precision Products Measuring PART 1 INTRODUCTION The DIT 5200L Non Contact Displacement Measuring System is an advance in precision measurement technology It provides exceptional resolution repeatability and nulling accuracy for detecting the aligned centered position of a conductive target relative to a pair
14. mes its diameter Unequal loading causes asymmetrical output from the sensors which induces non linearity in the system output Ideally no conductive material other than the target should be in the sensor s field Some loading may be acceptable if it is equal and the sensors are calibrated in place Even then sensor loading may cause non linearity If unable to calibrate then loading is too great Unequal Displacement For targets using pivot point mount the system should see equal displacement i e the pivot point of the target is perfectly centered between the sensors If the pivot point is a fraction of a centimeter off it can introduce non linearity into the system e The pivot point must be on a common line between the centerline of a pair of sensors e The axis of tilt must be a perpendicular bisector of a line between the centerlines of a sensor pair e The pivot point must be positioned on the target so as not to introduce a translation error This error a function of angle is caused by slight changes in the effective null gap as the target moves about the pivot This results in non linearity www kamansensors com PART NO 860522 001 Last Revised 5 14 2015 KAMAN Precision Products Measuring e The pivot point must not move or change with time 3 6 Target Characteristics Target Material Aluminum is the preferred target material for the DIT 5200L Aluminum targets may be mounted on materials with more stable
15. o 140 F OC to 60 C e Sensors 62 F to 220 F 52 C to 105 C e Cryogenic 20N Sensor 4 K to 220 F 105 C Storage Temperature Range e Electronics 26 F to 180 F 32 C to 82 C e Sensors 62 F to 220 F 52 C to 105 C e Cryogenic 20N Sensor 4 K to 220 F 105 C www kamansensors com PART NO 860522 001 Last Revised 5 14 2015 Oe ee KAMAN Precision Products Measuring Sensor Range Specific Performance Range Range Null Null 75Nj20N Typical l Equivalent mil mm mil mm RMS Input Noise FR VHz FR Null 10 0 25 151040 x 0 15 0 30 0 02 2E 5 2E 5 10 0 25 20 050 x 0 10 0 20 0 02 2E 5 2E 5 20 0 50 25 o0 65 x 0 25 0 50 0 03 20 0 50 40 1 0 x 0 15 0 30 35 0 90 40 10 x 0 50 1 00 0 03 50 1 25 60 15 x 0 25 0 50 0 03 75 190185 22 x 0 50 1 00 0 03 Note Full Range FR is considered as twice the Range Calculating Effective Resolution To calculate the effective resolution take the Equivalent RMS Input Noise and multiply it by the square root of the measurement bandwidth Peak to peak noise is normally 6 6 times higher than the RMS noise assuming gaussian randomly distributed noise For Example to calculate the worst case noise of a 15N system with a 0 5 mm 500 micron range at a 20 kHz bandwidth Step 1 Calculate the full range of the system FR
16. re positive with movement toward the positive sensor The output on the channel will become more negative with movement toward the negative sensor On single channel systems only the Axis 1 X channel is used The system is set up with the sensors as marked Sensors are supplied as matched pairs for optimum performance Swapping sensors will result in degraded performance without factory recalibration www kamansensors com PART NO 860522 001 Last Revised 5 14 2015 KAMAN Precision Products Measuring PART 3 APPLICATION INFORMATION For differential measurement applications the two electronically matched sensors are positioned on opposite sides or ends of the target The sensor to target relationship is such that as the target moves away from one sensor it moves toward the other an equal amount Figure 4 Sensor Target Relationship Standard systems come with two measurement axes four sensors two per axis and can therefore be fixtured a number of ways to provided precise x y alignment The figure below illustrates target configuration for x y alignment of an image stabilization mirror for an electro optical application Y AXIS MIRROR BACK ALUMINUM TAB X AXIS PIVOT Figure 5 Sensor Position on a Stabilization Mirror 3 1 Fixturing The user provides fixturing for the DIT 5200L electronics and sensors The following information establishes fixturing requirements for optimum system performance Both the
17. sensor and target fixturing must be structurally sound and repeatable www kamansensors com PART NO 860522 001 Last Revised 5 14 2015 KAMAN Precision Products Measuring 3 2 Sensor Mounting and Installation The sensors must be securely clamped A collet type fixture is the best It is best to clamp the fixture as close to the sensor face as possible without causing additional loading on the sensor this is to minimize expansion differences between the two sensor housings To insure that the fixturing does not load the sensor and cause performance errors you should have any metal parts approximately 3 sensor diameters away from the tip The target must not strike the sensor face The sensor should have a null gap and measuring range specified on the calibration record As an example a 15N sensor may have a null gap of 15 mils 0 015 0 381mm and a range of 10 mils 0 010 0 254 mm The difference between the null gap and measuring range is the offset distance for the sensors In this example the offset would be 15 10 5 mils for an offset The offset is the closest distance the sensor gets to the target during normal operation This offset is necessary both to optimize performance and to keep the target from contacting and possibly damaging the coils in the sensor face Install the sensors so that only the target interacts with the sensor s field No conductive material other than the target should be present within the
18. set null gap minus max range Measuring Range The full range of target motion over which the various specifications such as resolution linearity and sensitivity can be met The differential sensor arrangement yields a bipolar output and measuring range is expressed as and value either side of the null position measuring range null gap minus the offset Sensitivity scale gage factor Output voltage per unit of displacement Usually expressed as millivolts per mil 0 001 or per millimeter Linearity or non linearity The maximum deviation of any point of a calibrated system s output from a best fit Least Squares straight line Expressed in actual units e g micro inches or as a percentage of the full range the full scale output times 2 Equivalent RMS Input Noise A figure of merit used to quantify the noise contributed by a system component It incorporates into a single value several factors that influence a noise specification such as signal to noise ratio noise floor and system bandwidth Given a measuring systems sensitivity scale factor and the level of white noise in the system Equivalent RMS Input Noise can be expressed using actual measurement units Effective Resolution An application dependent value determined by multiplying the Equivalent RMS Input Noise specification by the square root of the measurement bandwidth Example an application with a 100 Hz bandwidth using a DIT 5200 with an Equiv
19. y first adjusting one sensor to the null gap and adjusting the opposing sensor for a zero volt output Reference section 3 2 NULL GAP A B 0 020 FOR 20N SENSOR OFFSET DISTANCE MEASURING RANGE Figure 8 Sensor Positioning for Calibration R112 Gain Ch X R117 Offset Ch X vi Fil aie Ici toes alalle y cin e ey yey c maT onanan f Er E morom Hle EO ra ae Fae a Hape N cIog4 eae E oes 3 C2 T pae ng ih mu FL go m iala Y i a mt izlel R217 Offset Ch Y R212 Gain Ch Y Figure 9 Potentiometer Locations www kamansensors com PART NO 860522 001 Last Revised 5 14 2015 11 KAMAN Precision Products Measuring Note Offset zero potentiometers R117 and R217 are not normally installed and are not included in this calibration sequence For the purpose of this example the desired Output is 10 000 Vdc a span of 20 000 Vdc 1 Position the target at FS Negative full scale 2 Adjust the Gain control for the measuring channel being calibrated to the full scale voltage 0 005mV unless otherwise specified i e 10 000 Vdc 3 Position the target at FS Positive full scale 4 Compare the actual output voltage to the desired output voltage and calculate the difference i e Actual output is 9 500 Vdc Desired output is 10 000 Vdc Difference is 500 Vdc 5 Adjust the Gain control for the measuring channel being calibrated to
Download Pdf Manuals
Related Search