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Polytec Scanning Vibrometer PSV 300

1. Abbreviation Decoder DC PLL DC HF OVD 04 Example 3DC 4HF means that the velocity decoder PLL DC with 3 measurement ranges and the velocity decoder OVD 04 with 4 measurement ranges are installed IEEE Bus Interface When operating the controller via the IEEE 488 GPIB interface on the back in this line the instrument address can be set in the range 1 30 Note If you control the PSV using the software via the IEEE 488 GPIB interface the IEEE 488 GPIB address of the controller must be set to 5 Serial Interface When operating the controller via the RS 232 interface on the back in this line itis possible to switch between the transfer rates 4800 Baud and 9600 Baud Note For all PSV models here the transfer rate must be set to 9600 Baud 5 11 5 Operating the PSV Menu SETTINGS Menu FOCUS 5 12 Inthe menu SETTINGS the measurement ranges and filters are set The contents of the menu depends on the decoders installed The individual settings have the following meaning Tracking Filter In this line you can set the tracking filter The input signal is pre processed with the tracking filter You will find information on the settings OFF SLOW FAST of the tracking filter in section 4 2 3 Velocity Decoder In this line you can set the active velocity decoder This line is only present if both decoders OVD 04 and PLL DC are installed The velocity decoders are abb
2. 60 A f 0 1 0 2 0 5 1 2 5 10 20 Figure 4 4 Amplitude frequency response of a 3rd order Bessel low pass filter 4 5 4 Making Measurements The amplitude error caused by the filter can be determined from figure 4 5 Amplitude error 0 20 25 30 ur 0 0 0 1 02 0 3 0 4 0 5 0 6 0 7 0 8 0 9 10 fo Figure 4 5 Amplitude error of a 3rd order Bessel low pass filter in the pass band The phase frequency response of the filter is shown in figure 4 6 Phase degrees 0 20 40 60 80 100 Ls 0 0 0 2 0 4 0 6 0 8 40 f Figure 4 6 Phase frequency response of a 3rd order Bessel low pass filter in the pass band 4 6 4 Making Measurements Phase shift An additional time delay is caused by the velocity decoder It depends on the caused by the measurement range and is approximately a few microseconds The resulting velocity overall phase shift Ad can be estimated using the following simple equation decoder AO jpcp f Equation 4 1 p phase shift of the low pass filter refer to figure 4 3 and figure 4 6 p specific phase roll off refer to specifications in section 7 1 3 f frequency in kHz 4 2 3 Tracking Filter The tracking filter is used to improve the signal to noise ratio of the interferometer signal This is particularly good for bridging short dropouts which occur due to the speckled natured of the lig
3. JUNCTION BOX PSV Z 040 H F U OPTION PC RS232 VIDEO ray ACQUISITION BOARD 2 U DIO DAC U o 8 gt model H U WORKSTATION PSV PC AV GENERATOR ACQUISITION only model H Figure 3 18 Cabling of the back panel of the junction box Model F has one 68 pin SCSI type connector instead of the two VHDIC type connectors 3 26 Scanning head hand set PSV Z 051 Pan tilt stage PSV Z 017 Mains connection 3 First Steps 20 If required connect the hand set PSV Z 051 to the 12 pin circular jack REMOTE CONTROL on the front of the scanning head 21 If applicable plug the Scanning Head cable from the connector box of the optional pan tilt stage into the 4 pin circular jack on the underside of the scanning head 22 Plug the Pan Tilt cable from the connector box of the pan tilt stage into the circular jack on the pan tilt stage 23 Plug a mains cable into the back of the workstation and into a wall socket providing protective grounding Caution Always check the setting of the voltage selectors on the back of the workstation and the controller as well as the rating of the fuses on the back of the controller and the junction box before connecting to the mains 24 Plug a mains cable into the back of the junction box and into a wall socket providing protective grounding 25 Plug a mains cable into the back of the contro
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5. DISPLACEMENT LLO REMOTE O RESET 1 Figure 3 1 Front view of the controller POWER LED The LED lights up when the key switch on the controller is turned to position and indicates that the controller is ready to operate Mains switch This key switch disconnects the vibrometer from the mains position O and is used to turn it off in the case of danger Caution Always connect all connecting cables before switching the controller on Liquid Crystal Display LCD with background lighting This display shows the settings of the controller The organization of the display and how to use it to operate the controller without the software are described in section 5 12 FUNCTION keys These keys do not have a function when the controller is operated via the software When the controller is operated without the software the cursor is moved up and down on the display using the T and J keys refer to section 5 12 1 3 3 3 First Steps 3 4 10 11 12 13 SETTING keys These keys do not have a function when the controller is operated via the software When the controller is operated without the software these keys are used to change the settings refer to section 5 12 1 OVER indicator for the velocity The LED lights up when the output voltage exceeds either the positive or negative full scale range peak of the velocity
6. Maximum DC offset Velocity decoder PLL DC 50mV Velocity decoder OVD 04 20mV Measurement Ranges Velocit Measurement Full scale Maximum Maximum SOON range tput ior 2 acceleration decoder g outpu Resolution frequency scaling factor peak peak H U F H U F mos mm um kHz kHz g g PLL DC 1 20 0 3 20 20 150 150 5 100 0 3 50 50 1600 1600 25 500 0 8 50 50 8000 8000 OVD 04 10 200 0 5 200 200 12000 12000 25 500 2 250 1000 40000 160000 125 2 500 5 250 1500 200000 1200000 1000 20000 10 250 1500 1600000 9600000 1 Resolution is defined as the signal amplitude rms at which the signal to noise ratio is OdB in a 10Hz spectral bandwidth RBW measured at 3M Scotchlite Tape 1dB maximum error 7 2 Calibration Accuracy Amplitude error Velocity Measurement decoder range T 25 5 C full operating T 77 9 F temperature range T V of rms reading of rms reading PLL DC 1 5 1 0 1 2 25 OVD 04 10 1 0 1 5 25 1 0 2 0 125 1 5 2 5 1000 15 2 5 Conditions sinusoidal vibration f 1kHz amplitude 70 of full scale range load resistance 2 1MO 7 Technical Specifications Amplitude Linearity Maximum linearity error 1 of rms reading one particular range 2 5 of rms reading overall Linearity error is defined as the amplitude dependent relative deviation of the scaling factor referred to the nominal scaling factor under calibratio
7. 7 Keep the assembly instructions for the tripod and the fluid stage in a safe place If your PSV is equipped with a pan tilt stage you must proceed with the assembly as follows 1 Unpack the pan tilt stage and check it for external damage scratches loose screws etc 2 Check the contents of the assembly kit 1 Adapter plate with 3 Allen screws M6x16 1 Connector box with 4 Allen screws M8x40 3 Allen screws M8x16 with washers 1 Mounting plate with 2 Allen screws M6x20 2 Allen screws M6x16 with washers 1 Allen key size 5 1 Allen key size 6 Caution Make sure that the screws are always tightened to ensure that the system is both stable and functions accurately 3 Attach the mounting plate on the underside of the scanning head with 2 Allen screws M6x20 To do this use the Allen key size 5 Caution Make sure that the mounting plate is correctly aligned The FRONT labeled side of the plate has to be mounted in the direction of the front panel of the scanning head as shown in figure 3 12 3 First Steps T Scanning head a oo Mounting plate g a T 2 Allen screws M6 x 20 Figure 3 12 Fixing the mounting plate on the scanning head 4 Unpack the tripod and check it for external damage scratches loose screws etc 5 Assemble the tripod as described in the assembly instructions from the manufacturer MANFROTTO 6 Unscrew the plate on the top of the tripod and keep the plat
8. Dimensions refer to section 7 3 5 Weight 11kg 7 3 2 Optics Front lens Long range Mid range QR MR Focal length mm 100 60 Minimum stand off distance mm 450 175 Aperture diameter 1 e mm 12 7 Spot size typ um 175 mm 10 450 mm 15 33 1000 mm 42 79 each additional meter plus 50 84 Maxima of visibility mm 14 n 203 nz0 1 2 A label shows the front lens model which is fitted The label can be seen through the top left air vents of the scanning head refer to figure 7 1 Measured from the front panel of the scanning head Label QR or MR inside Figure 7 1 Position of the label for the front lens model 7 Technical Specifications 7 3 3 Scanner Type Maximum deflection Angular resolution Pointing stability 7 3 4 Video Camera 7 8 Video system Sensor Signal to noise ratio Zoom Lens Angle of view horizontal Minimum stand off distance Minimum illumination servo controlled galvo motor horizontal 20 vertical 20 0 002 0 01 hour after warming up CCIR PAL color CCD 1 4 752x582 pixels gt 50dB 72x 4x digital zoom F 1 4 f2 4 1 73mm auto focus auto iris 18 fold motor driven zoom gt 48 2 7 wide end 10mm tele end 800mm 3 lux 7 Technical Specifications 7 3 5 Dimensions 150 50 Beam Beam 12 50 i i l i axis for x motion a i 0 028 4 0
9. 50 100 150 200 250 300 350 400 t 0 0 2 0 4 0 6 0 8 4 Figure 4 3 Phase frequency response of an 8th order Butterworth low pass filter in the pass band 4 4 PSV 300 F U 4 Making Measurements In the PSV 300 F and U low pass filters with 3rd order Bessel characteristics and cutoff frequencies of 5kHz 20kHz or 100kHz are used Characteristic for Bessel filters is the phase linearity from the frequency zero up to the cutoff frequency i e the phase shift increases in proportion to the frequency The filter however causes amplitude errors in the pass band which can be roughly estimated e Up to 20 of the cutoff frequency the maximum amplitude error is 196 e At the cutoff frequency the amplitude error is 3dB approx 30 The phase shift increases in proportion to the frequency from Zero degree at the frequency Zero to approximately 100 degrees at the cutoff frequency refer to figure 4 6 Due to this linear phase frequency response the filter shows optimal transmission behavior for pulses as all frequencies of a complex wave are subjected to the same time delay Thus the shape of the pulse is not falsified but it is merely delayed The complete amplitude frequency response of a 3rd order Bessel low pass filter is shown in figure 4 4 The frequency is normalized to the cutoff frequency f Amplitude dB 10 20 30 40 50
10. ONSE Demodulator V i Signal M Level XY Velocity Signal Level Pepay IIND Output Output Switch Af Af AN Low Pass Amplifier mod mox a Demodulator II Figure C 1 Block diagram of the controller OF V 3001S The RF signal from the scanning head sensor input initially passes the functional block signal conditioning where it is pre processed to optimally drive the following blocks Subsequently follows the velocity signal decoding If the controller is fully equipped there are two velocity decoders installed demodulator and demodulator II The velocity is modulated on the radio frequency of the input signal In the velocity decoder an AC voltage is generated which is proportional to the instantaneous velocity of the object with the aid of so called FM demodulators The individual demodulators require different reference frequencies which are in a fixed relationship to the driver frequency of the Bragg cell in the interferometer They are generated in the central oscillator block synchronized with the driver signal for the Bragg cell The velocity decoder is followed by a low pass filter which suppresses spurious RF components and limits the bandwidth of the output signal to reduce background noise Via the system control various cutoff frequencies can be set for the low pass filter The last block in each signal path is an amplifier which scales the output signals and can optimally drive subsequent signal proc
11. Object Assembly Undo the protective cap from the objective of the close up unit and screw the micro scan lens onto the objective Technical Specifications The stand off distances and scan fields of the different micro scan lenses are shown in table A 2 Table A 2 Stand off distances and scan fields of the micro scan lenses Min Nom Max Vli oid scan field scan field scan field M Depth of field X x Y X x Y X x Y mm mm mm mm um mm OFV CL 80 160 1 2 x 1 0 5x4 14 x 10 7 0 4 OFV CL 150 230 1 8 x 1 3 7x5 23 x 17 13 1 3 OFV CL 300 380 2 6x 3 5 10x14 46 x 35 25 5 0 measured from the front panel of the scanning head at 18x optical zoom 3 with front lens model MR A 4 The nominal scan field values are suitable for orientation Stronger zoom is achieved by interpolation which might reduce the quality of the video image A Optional Accessories for the Scanning Head OFV 056 Fiber Optical Ring Light PSV Z 056 To enhance the quality of the video image the optional fiber optical ring light can be mounted on the micro scan lenses OFV CL 80 and OFV CL 150 For mounting the ring light you proceed as follows 1 Mount the ring light on the micro scan lens and hand tighten the knurled screw 2 Undo the protective cap from the other end of the fiber cable 3 Insert the fiber cable into the Modulamp receptacle of the light source an
12. Polytec Hardware Manual Polytec Scanning Vibrometer PSV 300 d RRR SSO RN Controller OFV 3001S Scanning Head OFV 056 Warranty and Service The warranty for this equipment complies with the regulations in our general terms and conditions in their respective valid version This is conditional on the equipment being used as it is intended and as described in this manual The warranty does not apply to damage caused by incorrect usage external mechanical influences or by not keeping to the operating conditions The warranty also is invalidated in the case of the equipment being tampered with or modified without authorization To return the equipment always use the original packaging Otherwise we reserve the right to check the equipment for transport damage Please mark the package as fragile and sensitive to frost Include an explanation of the reason for returning it as well as an exact description of the fault You can find advice on fault diagnosis in chapter 6 Trademarks Brand and product names mentioned in this manual could be trademarks or registered trademarks of their respective companies or organizations Identification Labels Controller Scanning Head Pan Tilt Head Workstation Sensor Head Test Stand Junction Box Contents Contents 1 Safety Information 1 1 14 Laser Safety eat 1 1 1 2 Laser Warning Labels
13. you can use the software to define and delete scan points please refer to your software manual When the PSV is controlled via the software LEDs REMOTE and LLO are lit up all settings are adjusted via the software refer to your software manual In this case the keys FUNCTION and SETTING on the front of the controller do not have a function You will find information on setting the measurement range and the filters in section 4 2 When the controller is operated without the software you can set the measurement range and the filters via a menu on its display using the keys FUNCTION and SETTING refer to section 5 12 5 11 Overrange Indicator Software Controller 5 8 Overranging is indicated in the software Please refer to your software manual If the LED OVER on the front of the controller is lit up continuously it means that the measurement range set is being exceeded In this case the next highest measurement range must be selected You will find further information on setting the measurement range in section 4 2 1 5 Operating the PSV 5 12 Operating the Controller without the Software 5 12 1 Operating Philosophy In normal operation the keys FUNCTION and SETTING on the controller are deactivated and all settings are adjusted via the software It is also possible to make measurements without using the workstation In this case you can only make single point measurements and you can not make use of the digital data
14. F U 3 9 LED on the junction box model H 3 8 LED on the workstation 3 12 power consumption controller 7 1 junction box 7 5 pan tilt stage 7 11 scanning head 7 7 workstation 7 10 preparing functional test 3 28 PRINTER connector on the workstation model F U 3 16 on the workstation model H 3 14 processor workstation 7 10 protection class controller 7 1 junction box 7 5 PSV models 2 2 start up 4 1 Index R REF jack on the junction box model F U 3 10 REF1 REF2 REF3 jack on the junction box model H 3 9 reference signal cabling 3 22 REMOTE CONTROL jack on the scanning head 3 6 REMOTE FOCUS interface on the controller 3 6 REMOTE LED on the controller 3 4 RESET key on the controller 3 4 key on the workstation 3 12 resolution 7 2 return the PSV 3 2 RF signal conditioning in the controller C 2 ring light for micro scan lenses A 5 rotation velocity pan tilt stage 7 11 RS 232 interface on the controller 3 5 on the junction box 3 11 S safety electrical 1 4 laser 1 1 scaling factor 7 2 scan angle close up unit A 1 scan fields close up lenses A 2 micro scan lenses A 4 scan points defining in the software 5 8 using hand set PSV Z 051 5 7 scan points deleting in the software 5 8 using hand set PSV Z 051 5 8 scanner type 7 8 scanner specification 7 8 vii Index scanning head accessories A 1 air vents 3 8 assembly 3 17 assembly on the telescope drive A 6 beam shutter 3 8 5 1
15. IEEE 488 3 First Steps The back panel of the controller is shown in figure 3 2 INTERFEROMETER 00000000 EXT DEC 000 Figure 3 2 Rear view of the controller Mains connection combination Socket for standard power cord with built in fuses and mains voltage selector Warning Always disconnect from the mains before checking the fuses Caution Always check the settings of the voltage selector and the rating of the fuses before connecting to the mains INTERFEROMETER connector Sub D jack Jack for the interferometer cable to the junction box RS 232 interface 9 pin Sub D jack Jack for the RS 232 cable to the workstation to control the PSV with the software Note To control the PSV using the software in the controller the transfer rate must be set to 9600 Baud refer to section 5 12 3 4 Cooling fan This opening must always be kept free to ensure sufficient cooling The distance from the Caution wall should be at least 50mm IEEE 488 GPIB interface SIGNAL output BNC jack The DC voltage at this output is proportional to the logarithm of the optical signal level 3 5 3 First Steps 7 co REMOTE FOCUS interface 7 pin circular jack Interface for the optional hand set OFV 310 to focus the laser beam refer to section A 3 External decoder interface EXT DEC optional Interface for an external
16. processing of the PSV The velocity signal is then available at the BNC jack VELOCITY OUTPUT on the front of the controller The controller is operated via a menu on its display using the keys FUNCTION and SETTING The operating structure is mainly self explanatory The individual menus are described in section 5 12 3 FUNCTION Using the keys T and J a menu is selected and within the menu a parameter is selected SETTING Settings are changed using the keys and The menu SETTINGS is shown in figure 5 4 as an example of the display Focus T gt Tracking Filter Fast Velocity Decoder HF Velocity Range 125 mm s V Velocity Filter off 1 5 MHz Signal Config J Figure 5 4 Example of the controller s display The parameters are run through vertically on the display using the keys T and J Once the end of the display page is reached it changes to the next menu The possibility of branching off to other menus is shown at the top and the bottom on the right The cursor gt on the left marks a selected parameter The setting of the parameter is changed to higher and lower values with the keys and Adjusted settings are activated straight away As the control processor has a battery supported memory the settings are stored when the instrument is switched off and reloaded when it is switched on again or after RESET This saves time making adjustments for repeated measurements 5 9 5 Operating the PSV 5 12 2 Or
17. 10 and 25 125 and 1000 lt 0 2 lt 54dB 0 395 50dB lt 0 3 lt 50dB lt 0 5 lt 46dB 7 1 4 Interfaces 7 4 RS 232 IEEE 488 GPIB REMOTE FOCUS EXT DEC SIGNAL 8 data bits no parity baud rate 4800 or 9600 9 pin female Sub D cable to the workstation 1 1 wired according to IEEE 488 1 special interface for the optional hand set OFV 310 special interface for an external digital displacement decoder OV 3V DC proportional to the logarithm of the optical signal level load resistance 10kO 7 2 Junction Box PSV Z 040 7 2 1 General Data Mains voltage Power consumption Fuses Protection class Operating temperature Storage temperature Relative humidity Dimensions Weight 7 2 2 Interfaces RS 232 Baud rate Data format Cable Pins 7 Technical Specifications 100 240 VAC 10 50 60 Hz max 75VA 2 0A slow blow protective grounding 5 C 40 C 41 F 104 F 10 C 60 C 49 F 149 F max 80 non condensing 450 mm x 355 mm x 90mm 5 8kg 9600 Baud 8 data bits 1 stop bit no parity bit 9 pin female Sub D cable 1 1 wired pin 2 received data Red pin 3 transmitted data Axed gt pin 5 reference potential GND pin 1 4 6 7 8 9 N A VELO REF REF1 REF3 at Model H Input impedance Input coupling Over voltage protection TRIG IN Compatibility Input voltage Input current
18. 3 11 Scanning head mounted on the fluid stage and on the tripod Before attempting to mount the scanning head all locking mechanisms of the trolley and the tripod particularly screws should be checked to make sure they are tight A loose screw may cause the stand to be unstable and possibly collapse Note It is best to carry out the following assembly when someone is there to help you 3 17 3 First Steps Tripod with fluid stage OFV S2 Tripod with pan tilt stage PSV Z 017 optional 3 18 If your PSV is equipped with a fluid stage you must proceed with the assembly as follows 1 Assemble the tripod as described in the assembly instructions provided by the manufacturer MANFROTTO 2 Then mount the fluid stage as described in the assembly instructions provided by the manufacturer MANFROTTO 3 Open the locking mechanism on the fluid stage by simultaneously pressing the safety latch and opening the safety lever 4 A suitable quick release hexagonal plate has been pre mounted on the scanning head Use this plate to position the scanning head on the fluid stage The safety lever clicks into place automatically 5 Ensure that the quick release plate is attached all the way around This needs to be done before the scanning head is ready to use 6 Whenever you want to remove the scanning head from the fluid stage one person should hold the scanning head while the second person opens the safety lever
19. A 5 picture 2 4 Hang up the scanning head with the adapter plate above at the telescope drive refer to figure A 5 picture 3 5 Secure the scanning head by fixing the adapter plate to the telescope drive using 2 Allen screws refer to figure A 5 picture 4 Cabling For the electrical connection of the test stand you proceed as follows 1 Connect the cable of the telescope drive to the motor connection 3 of the drive control in figure A 6 2 Plug the hand set cable into the Sub D jack 2 in figure A 6 A Optional Accessories for the Scanning Head OFV 056 3 Plug the mains cable into connection 1 of the drive control and into a wall outlet providing protective grounding 2 1 2 3 4 5 QC OX Figure A 6 Connections on the drive control 4 To move the scanning head upstairs press the arrow key T on the hand set Move the scanning head downstairs by pressing the arrow key J on the hand set 5 f you press the arrow key for more than approximately 2 seconds the motor switches over to fast mode After approximately 3 seconds the motor reaches its maximum velocity For fine positioning the arrow key can be repeatedly pressed briefly Technical Specifications Drive control Mains voltage Power output Protection rating Operating temperature Dimensions Weight Telescope drive Protection rating Operating temperature Operating time intermittent Operating time cont
20. A 8 on the hand set PSV Z 051 5 3 on the scanning head 3 7 signal to noise ratio video camera 7 8 software adjusting settings 5 8 define and delete scan points 5 8 focusing the laser beam in the 5 4 other components 3 1 overrange indicator 5 8 positioning the laser beam in the 5 6 signal level display 5 4 specification technical close up unit A 1 controller 7 1 data acquisition board 7 10 junction box 7 5 pan tilt stage 7 11 scanner in the scanning head 7 8 scanning head general 7 7 scanning head optics 7 7 video camera in the scanning head 7 8 workstation 7 10 spot diameter close up lenses A 2 micro scan lenses A 4 Spot size typ 7 7 stabilization of the signal amplitude C 2 stand off distance min scanning head 7 7 video camera 7 8 stand off distances close up lenses A 2 micro scan lenses A 4 scanning head 4 9 start up the PSV 4 1 stop band rejection low pass filter 7 1 storage temperature controller 7 1 junction box 7 5 scanning head 7 7 suitable settings low pass filter 4 2 measurement range 4 2 tracking filter 4 7 summary PSV models 2 2 switch bar dust cover on the scanning head 3 7 switching on controller 5 1 on functional test 3 28 when measuring 4 1 workstation 5 1 SYNC jack on the junction box model F U 3 10 SYNC OUT jack on the junction box model H 3 8 system cabinet assembly 3 21 system components 2 1 T technical specification close up unit A 1 controller 7 1 data acquisition b
21. C 5 C Functional Description of the Controller C 6 D Declaration of Conformity Appendix D Declaration of Conformity ce Konformit tsbescheinigung Declaration of Conformity f r for Gegenstand Objekt Scanning Vibrometer Controller Typ Model OFV 3001 SU3 SU5 SF6 SH6 ID 31955 ID 31965 ID 31969 ID 31966 Sensor Typ Model OFV 056 ID 31956 Junction Box Model PSV Z 040 U PSV Z 040 F PSV Z 040 H ID 31971 ID 31972 ID 32615 Der Hersteller The manufacturer Polytec GmbH Polytec Platz 5 7 76337 Waldbronn Germany best tigt das Einhalten der Richtlinien 89 336 EWG und 73 23 EWG confirms the compliance with the directive 89 336 EEC and 73 23 EEC Das Ger t stimmt berein mit den folgenden Normen The unit comply to the following standards EN 50825 1 Sicherheit von Laser Einrichtungen Safety of laser products EN 61010 Sicherheitsbestimmungen f r elektrische Me Steuer Regel und Laborger te Safety requirements for electrical equipment for measurement control and laboratory use EN 50081 1 Elektromagnetische Vertr glichkeit EMV Fachgrundnorm EN 50081 2 St raussendung Electromagnetic compatibility Emission EN 55011 Grenzwertklasse B FCC Class B EN 50082 1 Elektromagnetische Vertr glichkeit EMV Fachgrundnorm EN 50082 2 St rfestigkeit Electromagnetic compatibility Immunity VDE 0843 2 5 IEC801 1 5 Ausgestel
22. For evaluation the acquired data is directly overlaid onto the recorded video image Data can also be exported to various software packages e g for modal analysis Note If you control the PSV using the software via the IEEE 488 GPIB interface the IEEE 488 GPIB address of the controller must be set to 5 To make a measurement with the PSV you proceed as follows 1 Make sure that the key switch on the controller is in position O and the beam shutter on the scanning head is in position OFF 2 Position the scanning head roughly so that its laser beam aperture points in the direction of the object to be measured If possible set the scanning head up at an optimal stand off distance to the object to be measured You will find information about optimal stand off distances in section 4 3 3 Turn the controller on by setting the key switch to position I Please allow 30 minutes for the laser to warm up before making measurements On the front of the controller the LED POWER lights up Providing all connecting cables have been installed correctly the LED POWER on the front of the junction box and the emission LED LASER on the scanning head also light up Laser light is not yet emitted as the beam shutter is still closed 4 Switch on all optional devices 5 Switch on the workstation start the software and change to the Acquisition Mode as described in your software manual On changing to the Acquisition Mode control of th
23. Limitation of the bandwidth at the input of the signal processing electronics is required because for low velocities only a narrow section of the system bandwidth is occupied by the FM signal In the remaining bandwidth only noise is recorded For this reason at the input section of the controller a switchable filter is installed which limits the noise bandwidth depending on the velocity measurement range set The dropout reduction via tracking filter plays a very important role in optical signal processing The light scattered back from the object has a speckled nature i e at any instant the detector sees a light or a dark speckle The low signal amplitude of the dark speckle can lead to loss of signal so called dropouts When decoding the velocity this interruption of the input signal causes short but high noise signals so called spikes which make it very difficult to analyze the output signal These dropouts are effectively reduced by a so called tracking filter integrated in the input section of the controller This is done by an electronic circuit to regenerate high frequency signals based on the principle of the phase locked loop PLL The principle of signal regeneration by the tracking filter is based on replacing the input signal with a distorted amplitude by a stable signal from a voltage controlled oscillator which is synchronized with the frequency and the phase of the input signal Suitable circuit design can make it possible to
24. PSV Z 035 ready assembled The positions of the individual system components in the cabinet is shown in figure 3 15 1 Undo the housing feet of the system components and keep the housing feet and the screws in a safe place 2 Place the controller at the bottom as the air vents are situated in the bottom plate Caution To ensure sufficient cooling the controller must be situated at the bottom and the junction box at the top of the system cabinet 3 Insert the workstation above the controller 4 Are the air vents of your junction box in the top plate If not please exchange the top and bottom plate 5 Insert the junction box above the workstation m Fix all front panels with the screws provided 7 Place the other system components as shown in figure 3 15 J Monitor Keyboard Junction Box Workstation Controller Figure 3 15 Position of the PSV components on the system cabinet 3 21 3 First Steps 3 4 2 Cabling Workstation Controller gt workstation Controller gt hand set OFV 310 Controller lt junction box Reference signal External trigger 3 22 All system components should now be correctly mounted The individual steps on cabling the PSV are described in the following The complete cabling is shown in figure 3 16 to fi
25. SCSI type connector ACQUISITION BOARD on the back of the junction box and into the two VHDIC type connectors ACQUISITION on the back of the workstation PSV 300 F Plug the Acquisition cable into the SCSI type connector ACQUISITION BOARD on the back of the junction box and into the SCSI type connector ACQUISITION on the back of the workstation 17 Plug the DIO DAC cable into the 37 pin Sub D jack DIO DAC on the back of the junction box and into the 62 pin Sub D jack DAC on the back of the workstation 18 Only PSV 300 H If required plug the Generator cable into the three BNC jacks OPTION 1 2 and 3 on the back of the junction box and into the SCSI type connector GENERATOR on the back of the workstation Caution The cable numbers of the generator cable have to be in accordance with the corresponding number of the jack OPTION 1 2 or 3 on the junction box Junction box 19 The umbilical cable has both a jack with a straight cable exit and a jack scanning with a cable exit on the side The cabling can be freely selected head depending on the way the scanning head has been mounted Plug the Umbilical cable into the industrial style connector on the back of the scanning head and into the industrial style connector SCANNING HEAD on the back of the junction box 3 25 3 First Steps SCANNING HEAD OFV 056 REMOTE CONTROL e HAND SET PSV Z 051 PAN TILT STAGE SIGNAL OUTPUT ouT3 FUNCTION GENERATOR
26. The output is only active if the corresponding option is installed Analog input VELO for the velocity signal BNC jack Analog input for the velocity signal from the controller Analog input REF BNC jack Analog input for the reference signal TTL output SYNC BNC jack Synchronization pulse for the generator signal PSV 300 U The output is only active if the corresponding option is installed TTL input GATE IN BNC jack TTL input for an external gating signal PSV 300 U The input is only active if the corresponding option is installed TTL output AUX OUT BNC jack TTL output for special applications programmable via the optional Visual Basic Engine PSV Z 082 3 First Steps Back panel for The back panel of the junction box for the PSV models H F and U is shown all models in figure 3 7 OPTION PC RS232 DIO DAC oke ACQUISITION BOARD e Jo VIDEO To To SCANNING HEAD VIBROMETER J am d Figure 3 7 Rear view of the junction box 1 Mains connection combination Mains socket with built in fuses The mains voltage input is designed as a wide range input Warning Always disconnect from the mains before checking the fuses Caution Always check the fuses before installing the PSV SCANNING HEAD connector industrial style Jack for the umbilical cable to the
27. VELOCITY OUTPUT 3 4 jack on the junction box model F U AUX IN 3 10 AUX OUT 3 10 GATE IN 3 10 REF 3 10 SIGNAL 3 10 SYNC 3 10 TRIG IN 3 10 VELO 3 10 jack on the junction box model H AUX OUT 3 9 GATE IN 3 9 OUT1 OUT2 3 9 REF1 REF2 REF3 3 9 SYNC OUT 3 8 TRIG IN 3 9 VELO 3 9 junction box cabling 3 22 3 25 connector ACQUISITION BOARD 3 11 connector DIO DAC 3 11 connector VIBROMETER 3 11 control elements back panel 3 11 control elements front panel model F U 3 9 control elements front panel model H 3 8 cooling fan 3 12 description 2 1 interface RS 232 3 11 jack VIDEO 3 11 mains connection 3 11 junction box model F U control keys pan tilt stage 3 9 jack AUX IN 3 10 jack AUX OUT 3 10 jack GATE IN 3 10 jack REF 3 10 jack SIGNAL 3 10 jack SYNC 3 10 jack TRIG IN 3 10 jack VELO 3 10 jacks OPTION 3 11 LED POWER 3 9 junction box model H connector generator cable 3 11 control keys pan tilt stage 3 8 jack AUX OUT 3 9 jack GATE IN 3 9 jack OUT1 OUT2 3 9 jack REF1 REF2 REF3 3 9 jack SYNC OUT 3 8 jack TRIG IN 3 9 jack VELO 3 9 LED POWER 3 8 Index junction box specification general data 7 5 interface AUX IN 7 6 interface AUX OUT 7 6 interface GATE IN 7 5 interface RS 232 7 5 interface SIGNAL 7 6 interface SYNC 7 6 interface TRIG IN 7 5 interfaces OUT1 OUT2 7 6 interfaces REF1 REF2 REF3 7 5 interfaces VELO REF 7 5 K key on the controller CLEAR 3 4 FUNCTION 3 3 RESET 3 4 SETTING 3 4 key
28. cabling 3 27 connector SCANNING HEAD 3 11 control elements back panel 3 7 control elements front panel 3 6 description 2 1 emission indicator 5 1 jack REMOTE CONTROL 3 6 LED LASER 3 7 main connector 3 8 optical configuration B 2 optimal stand off distance 4 9 signal level display 3 7 switch bar for the dust cover 3 7 vertical test stand A 5 SCANNING HEAD connector on the scanning head 3 11 scanning head setting up with the fluid stage 5 2 with the pan tilt stage 5 2 scanning head specification general data 7 7 optics 7 7 scanner 7 8 video camera 7 8 sensor video camera 7 8 serial interface setting baud rate 5 11 setting up scanning head with fluid stage 5 2 with pan tilt stage 5 2 setting up stand off distance 5 2 setting in the controller baud rate of the serial interface 5 11 instrument address of the IEEE interface 5 11 tracking filter 5 12 velocity decoder 5 12 velocity filter 5 12 velocity range 5 12 SETTING keys on the controller 3 4 settings adjusting in the controller 5 8 in the software 5 8 SETTINGS menu in the controller 5 12 settings suitable low pass filter 4 2 measurement range 4 2 tracking filter 4 7 setup measurements 4 1 short circuit protection interfaces junction box 7 6 viii SIGNAL display on the scanning head 3 7 jack on the controller 3 5 jack on the junction box model F U 3 10 signal level display 5 4 in the software 5 4 on the controller 5 12 on the hand set OFV 310 optional
29. digital displacement decoder 3 3 2 Scanning Head Front panel 3 6 On the underside of the scanning head there is a 4 pin circular jack for the cable to the optional pan tilt stage PSV Z 017 The front panel of the scanning head is shown in figure 3 3 REMOTE CONTROL 6 99 00 9 e 9 oF Figure 3 3 Front view of the scanning head 1 Connector REMOTE CONTROL for the hand set PSV Z 051 12 pin circular connector The hand set is used for focusing and positioning the laser beam refer to section 5 6 and section 5 8 Mounting holes for the optional coaxial unit OFV 056 C The optional coaxial unit is used for scanning small parts at short distance refer to section A 1 Video camera front lens The video camera is controlled via the software as described in your software manual Back panel 3 First Steps 4 Laser beam aperture Focusing and positioning the laser beam is controlled via the software as described in your software manual The laser beam can also be focused and positioned using the hand set as described in section 5 6 and section 5 8 Warning Never look directly into the laser beam with the naked eye or with the aid of mirrors or optical instruments 5 Dust cover switch bar Rotating the switch bar to a vertical position closes the apertures for the laser beam and the video camera Caution To protect the lenses and scanner mirrors only
30. illumination video camera 7 8 input coupling interfaces junction box 7 5 input current interfaces junction box 7 5 input impedance interfaces junction box 7 5 input voltage interfaces junction box 7 5 7 6 inspection when unpacking 3 2 installation electrical 3 22 mechanical 3 17 other components 3 1 instrument address of the IEEE interface in the controller 5 11 interface COM 1 on the workstation model F U 3 15 on the workstation model H 3 14 interface COM 2 on the workstation model F U 3 16 on the workstation model H 3 14 interface RS 232 on the junction box 3 11 technical specification 7 5 interface on the controller EXT DEC 3 6 IEEE 3 5 REMOTE FOCUS 3 6 RS 232 3 5 interfaces technical specification AUX IN on the junction box 7 6 AUX OUT on the junction box 7 6 controller 7 4 GATE IN on the junction box 7 5 OUT1 OUT2 on the junction box 7 6 REF1 REF2 REFS on the junction box 7 5 SIGNAL on the junction box 7 6 SYNC on the junction box 7 6 TRIG IN on the junction box 7 5 VELO REF on the junction box 7 5 interferometer heterodyne B 1 Mach Zehnder B 2 INTERFEROMETER connector on the controller 3 5 interferometric measurement theory B 1 internal function generator cabling 3 24 INTRO menu in the controller 5 11 J jack OPTION on the junction box 3 11 jack REMOTE CONTROL on the scanning head 3 6 jack VIDEO on the junction box 3 11 jack on the controller CLEAR 3 4 DISPLACEMENT 3 4 SIGNAL 3 5
31. mains switch and mains voltage selector Instead of using the voltage selector the mains voltage input can also be designed as a wide range input refer to section 3 1 The mains switch disconnects the workstation from the mains position O and is used to turn it off in case of danger Caution If applicable always check the setting of the mains voltage selector before connecting the workstation to the mains 3 13 3 First Steps 3 14 10 11 12 13 14 MOUSE connector 6 pin circular jack KEYBOARD connector 6 pin circular jack Network connector Jack of the Ethernet network board USB port Universal Serial Bus Alternative jack for peripheral devices like mouse keyboard etc Serial interface COM 1 9 pin Sub D connector Jack for the RS 232 cable to the junction box to control the video camera Parallel PRINTER connector 25 pin Sub D jack Serial interface COM2 9 pin Sub D connector Jack for the RS 232 cable to the controller to control the PSV via the software AV connector 9 pin Sub D jack Jack for the video cable to the junction box to transmit the video signal MONITOR connector 15 pin Sub D jack GENERATOR connector for the internal function generator SCSI II type Jack for the generator cable of the internal function generator to the junction box ACQUISITION connector for the data acquisition VHDIC type Jack for the Y shaped acquisition cable to the junction box to transm
32. open the dust cover when your are making measurements The back panel of the scanning head is shown in figure 3 4 Emission ON OFF LASER O Tr z0 0 BN Figure 3 4 Rear view of the scanning head 1 Signal level display SIGNAL The length of the bar is a measure of the amount of light scattered back from the measurement surface N LASER LED The LED lights up when the scanning head is correctly cabled to the junction box and the laser is turned on key switch on the controller in position I The LED indicates that the laser is active even if the beam shutter is closed refer to section 5 2 3 7 3 First Steps 3 Beam shutter EMISSION ON OFF In position OFF the laser beam is blocked Warning Only switch the beam shutter to the ON position when you are making measurements 4 Air vents Caution This opening must always be kept free to ensure sufficient cooling 5 Main connector industrial style Jack for the umbilical cable to the junction box 3 3 3 Junction Box Front panel The front panel of the junction box for the PSV model H is shown in for model H figure 3 5 Q Polytet Psv z o
33. scanning head VIBROMETER connector Sub D jack Jack for the interferometer cable to the controller DIO DAC connector 37 pin Sub D jack Jack for the DIO DAC cable to the workstation to control the scanner mirrors and the pan tilt stage ACQUISITION BOARD connector SCSI II type Jack for the acquisition cable to the workstation to transmit both measurement and control signals Optional connectors OPTION 1 2 3 BNC jacks PSV 300 H Connectors for the generator cable to the workstation for the internal function generator optional PSV 300 F U Up to three BNC jacks can be made available for special applications RS 232 interface 9 pin Sub D connector Jack for the RS 232 cable to the workstation to control the video camera VIDEO output BNC jack Jack for the video cable to transmit the video signal to the workstation 3 11 3 First Steps 9 Cooling fan Caution This opening must always be kept free to ensure sufficient cooling The distance from the wall should be at least 50mm 3 3 4 Workstation Front panel The front panel of the workstation for the PSV models H F and U is shown for allmodels in figure 3 8 The lockable front flap is shown as transparent Figure 3 8 Front
34. surroundings It is very important to ensure that there is sufficient air circulation to keep the system components cool The air vents of the scanning head must never be covered up and the back panels of the electronics cabinets must be at least 50mm away from the wall The housing surfaces of the instrument can be cleaned with mild detergent solutions Organic solvents must not be used Avoid any additional weight on the pan tilt stage by placing objects on top of the scanning head or attaching things to it as this can put strain on the pan tilt stage Always contact Polytec prior to connecting any other hardware or software components to the PSV which are not part of it as this is likely to damage the system and could invalidate the warranty 3 First Steps Opening up Opening up of the equipment without authorization is not necessary for its the equipment operation and will invalidate the warranty 3 2 Unpacking and Inspection Unpacking Inspection 3 2 The PSV consists of the following components controller OFV 3001 S scanning head OFV 056 junction box PSV Z 040 H F U workstation with keyboard and mouse monitor with monitor cable and mains cable tripod with fluid stage OFV S2 umbilical cable interferometer cable video cable acquisition cable DIO DAC cable BNC cable 2 RS 232 cables 1 1 wired 3 mains cables PSV 300 H F hand set PSV Z 051 optional TFT monitor with monitor cable and mai
35. the front of the controller both LEDs LLO and REMOTE light up Before now opening the beam shutter remember the information on laser safety provided in section 1 1 Open the dust cover and the beam shutter of the scanning head The laser beam is now emitted from the scanning head Test the function of the scanning head controls focus and position of the laser beam zoom and focus of the video camera movement of the pan tilt stage as described in your software manual Put a matt white test surface e g a piece of paper at approximately 20cm from the front panel of the scanning head in the beam path Focus the laser beam on the test surface The signal level display will light up to show that the scanning head and the input section of the controller are working correctly If the functional test has been successful you can now make measurements as described in chapter 4 If your PSV does not perform as described above read through the information on fault diagnosis provided in chapter 6 and if necessary contact your local Polytec representatives 3 28 4 Making Measurements 4 Making Measurements 4 1 Start up Setup Switching on Measuring Data acquisition and storage for the PSV is fully controlled via the software A live video image of the object is displayed on the monitor and automatic scan sequences are defined directly on the live video image of the object All acquisition properties are set in the software
36. the optical path difference between the object beam and the reference beam vanishes within the interferometer The resulting path difference is equal to twice the distance between the beam splitter BS2 and the object The Bragg cell in the reference arm of the interferometer generates the additional frequency offset to determine the sign of the velocity The resulting interference signal of the object beam and reference beam is converted into an electrical signal in the photo detector and subsequently decoded in the controller B 2 C Functional Description of the Controller Appendix C Functional Description of the Controller C 1 Overview The main function of the controller is to demodulate the radio frequency signal RF signal provided by the interferometer in the scanning head The frequency of the signal is the carrier of the velocity information Secondary functions such as human interfacing display and filters improve the user friendliness of the system An overview of the functional structure of the controller is shown in figure C 1 li Signal Conditioning Oscillator Sensor TR fio AN n gt aa CN System Control C Input cs N O Velo G Bragg Cell f 99 Front Panel Drive Out RS 232 Control Bus N Level Detector Af Af V mod mod
37. 0 240V 50 60Hz max 350VA min Pentium Ill 700 MHz gt 18GB Microsoft Windows2000 or WindowsXP Ethernet card refer to user manual of the drive manufacturer desktop PC housing PSV Model PSV 300 H PSV 300 F PSV 300 U Data acquisition board PCI 4452 PCI 6111 PCI 4451 Input channels 4 2 2 simultaneously Resolution 16bit 12 16bit effectively 16bit depending on the bandwidth Maximum bandwidth 80kHz 1MHz 40kHz Maximum number of 6400 6400 3200 FFT lines optional 12800 optional 12800 optional 6400 For further information please refer to the manual of the data acquisition board which is installed on the workstation Switch on the workstation and in the Start menu of the task bar select Programs National Instruments NI DAQ Documents There click on the corresponding manual for the data acquisition board of your PSV model 7 Technical Specifications 7 5 Motorized Pan Tilt Stage PSV Z 017 optional Mains voltage Power consumption Operating temperature Relative humidity Maximum angle of rotation Rotation velocity Backlash Dimensions Weight Max load 115 230 VAC 50 60Hz adjustable on the connector box max 30W 20 C 50 C 4 F 122 F max 95 non condensing pan horizontal x 90 tilt vertical 84 limited by limit switch horizontal 6 sec vertical 5 sec 0 5 testing moment 10 Nm top mount 276mm x 149mm x 28
38. 010 134 50 1 149 20 BED iN M6 Ps 178 i M5 3x 207 50 1 4 i 2350 Y H 23 40 a 101 60 136 0 01 430 0 028 0 010 Y d m LL 405 PO aan Y C 1 The connector requires 170 Lat approx 120 mm free space at the back panel of the l scanning head 120 130 m 188 paat 152 62 axis for y motion gt l Wi WR E e co n ley o o Seg o y 28 d L0 EE i x e 6 S 5 Y g Figure 7 2 Views of the scanning head OFV 056 7 9 7 Technical Specifications 7 4 Workstation PSV PC 7 10 Industrial Workstation Mains voltage Power consumption Processor Hard disk drive HDD Operating system Network board CD drive writer Housing Desktop PC Mains voltage Power consumption Processor Hard disk drive HDD Operating system Network board CD drive writer Housing Data Acquisition workstation with voltage selector 115 230VAC 50 60Hz adjustable on the back panel workstation with wide range input 100 240V 50 60Hz max 350VA min Pentium Ill 700MHz gt 18GB Microsoft Windows2000 Ethernet card refer to user manual of the drive manufacturer industrial PC housing workstation with voltage selector 115 230VAC 50 60Hz adjustable on the back panel workstation with wide range input 10
39. 100V and 240V e Defective mains fuses may only be replaced by fuses of the same kind with their rating given on the back e The PSV must not be used with open housing As a general rule before removing parts of the housing the mains cable has to be unplugged e Air inlets and outlets must always be kept uncovered to ensure effective cooling If the cooling fan stops working the PSV is to be switched off immediately 1 4 2 Introduction 2 Introduction 2 1 Area of Application and System Summary The Polytec Scanning Vibrometer PSV measures the two dimensional distribution of vibration velocities on the basis of laser interferometry The system components are shown in figure 2 1 Scanning Head Junction Box Workstation AM Q Polytec Controller Figure 2 1 System components of the PSV The interferometer signal is decoded in the controller with the velocity decoder An analog voltage signal is thus generated which is proportional to the vibration velocity The junction box is the central connection point between the system components and provides the interfaces for peripheral devices The scanning head consists of the interferometer the scanners to deflect the laser beam and a video camera to visualize the measurement object The measurement data is digitally recorded in the workstation The software controls the data acquisition and offers user friendly functions to evaluate the measureme
40. 2 1 dimensions close up unit A 1 controller 7 1 junction box 7 5 pan tilt stage 7 11 scanning head 7 9 scanning head with close up unit A 3 DIO DAC connector on the junction box 3 11 disk drive on the workstation 3 13 displacement measurement theory B 1 DISPLACEMENT jack on the controller 3 4 display on the controller 3 3 signal level 5 12 velocity decoder 5 11 distortion harmonic 7 4 Doppler frequency theory B 1 down mixing of the frequency C 3 drive CD ROM 3 13 disk 3 13 drive control for the test stand cabling A 7 technical specification A 7 dropout reduction via tracking filter C 2 dust cover operating 5 2 switch bar on the scanning head 3 7 Index E electrical installation 3 22 safety 1 4 emission indicator on the scanning head 5 1 EMISSION shutter on the scanning head 3 8 environment operating 3 1 equipment opening up 3 2 EXT DEC interface on the controller 3 6 external trigger cabling 3 22 F fault diagnosis check data acquisition board 6 3 check output signal 6 3 general tests 6 1 no laser beam 6 2 no velocity signal 6 3 fiber optical ring light A 5 filter type low pass filter 7 1 fluid stage assembly on the tripod 3 18 setting up the scanning head 5 2 focal length 7 7 focus of the laser beam optimizing 5 4 FOCUS menu in the controller 5 12 focusing the laser beam in the software 5 4 using hand set PSV Z 051 5 3 using optional hand set OFV 310 A 8 via the controller 5 4
41. 40 H JUNCTION BOX POWER Figure 3 5 Front view of the junction box for the PSV model H 1 POWERLED The LED lights up when the junction box is correctly cabled to the controller and the key switch on the controller is turned to position The LED indicates that the junction box is ready to operate 2 Control keys for the pan tilt head pan Using these keys the optional pan tilt stage is panned clockwise gt or anti clockwise refer to section 5 4 Alternatively it can be controlled via the software as described in the software manual 3 Control keys for the pan tilt head tilt Using these keys the optional pan tilt stage is tilted upward T or downward J refer to section 5 4 Alternatively it can be controlled via the software as described in the software manual 4 TTL output SYNC OUT BNC jack Synchronization pulse for the generator signal 3 8 10 11 12 3 First Steps TTL input TRIG IN BNC jack TTL input for an external trigger signal Generator output OUT 1 BNC jack Output signal of the internal function generator Analog input REF 1 BNC jack Analog input for the reference signal Analog input VELO for the velocity signal BNC jack Analog input for the velocity signal from the controller Analog inputs REF 2 and REF3 BNC jack Analog inputs for 2 additional reference signals Generator output OUT2 BNC jack Additional output signal of the internal function gen
42. 6mm 12kg 18kg 7 11 7 Technical Specifications A Optional Accessories for the Scanning Head OFV 056 Appendix A Optional Accessories for the Scanning Head OFV 056 A 1 Coaxial Unit and Accessories A 1 1 Close Up Unit OFV 056 CF97 or OFV 056 CF99 You can scan small objects at short distance using the close up unit shown in figure A 1 Thereby the beam path of the laser is overlaid to the video image to equalize the parallax error Figure A 1 Close up unit OFV 056 C To ensure a clearly visible laser spot on the video image only a small part of the laser light is used for the video camera The size of that part depends on the back scattering properties of the surface Two models of the close up unit are available which have different special coated beam splitters e OFV 056 CF97 for mat surfaces reduces the intensity of the laser light by 97 e OFV 056 CF99 for highly reflective surfaces reduces the intensity of the laser light by 99 8 Technical Specifications Max scan angle in x direction 5 Max scan angle in y direction 4 Dimensions 135mm x 90mm x 100mm and figure A 2 Weight 1 3kg Block Filter OFV 056 F If the intensity of the laser light is still too high the supplied helium neon block filter should be additionally mounted The block filter is screwed directly to the the camera aperture of the scanning head and reduces once more the intensity of the laser light back scattered to the video cam
43. FREE mode on the hand set PSV Z 051 5 6 frequency response amplitude 7 3 phase 7 3 frequency roll off low pass filter 7 1 frequency max 7 2 front lens technical specification 7 7 video camera 3 6 front lens model label 7 7 front panel controller 3 3 junction box model F U 3 9 junction box model H 3 8 scanning head 3 6 workstation 3 12 full scale output 7 2 function principle micro scan lenses A 4 FUNCTION keys on the controller 3 3 functional description controller C 1 velocity decoder C 5 Index functional test preparing 3 28 switching on 3 28 testing 3 28 fuses controller 7 1 junction box 7 5 G GATE IN jack on the junction box model F U 3 10 jack on the junction box model H 3 9 general tests on fault diagnosis 6 1 GENERATOR connector on the workstation model H 3 14 GRID mode on the hand set PSV Z 051 5 5 H hand set OFV 310 optional focusing the laser beam A 8 signal level display A 8 hand set PSV Z 051 cabling 3 27 define scan points 5 7 delete scan points 5 8 focusing the laser beam 5 3 FREE mode 5 6 GRID mode 5 5 positioning the laser beam 5 5 signal level display 5 3 hard disk drive workstation 7 10 hardware components other 3 1 harmonic distortion specification 7 4 HDD LED on the workstation 3 12 heterodyne interferometer B 1 humidity controller 7 1 junction box 7 5 pan tilt stage 7 11 scanning head 7 7 I IEEE interface on the controller 3 5 setting instrument address 5 11
44. GATE IN Compatibility Input voltage 1MQ in parallel with 100pF AC DC adjustable in the software AC 3dB cutoff frequency 3 4Hz 42V TTL max 5 5V max 1mA TTL max 7 0V 7 5 7 Technical Specifications 7 6 OUT 1 OUT2 OUT3 Only Model H Output voltage swing max 10V referred to GND Output current max 5mA Output impedance 0 10 Short circuit protection permanently short circuit proof Load resistance min 2kQ Load capacity unlimited SIGNAL Only Model F U Output voltage swing max 10V referred to GND Output current max 5mA Output impedance 500 Short circuit protection permanently short circuit proof Load resistance min 2kQ Load capacity unlimited SYNC SYNC OUT at Model H Compatibility TTL Output HIGH voltage min 4 35V lu 3 5mA Output LOW voltage max 0 4V lut 5mA AUX OUT Compatibility TTL Output HIGH voltage min 2 4V lu 15mA Output LOW voltage max 0 5V lu 64 mA AUX IN Only Model F U Compatibility TTL Input voltage max 7 0V 7 3 Scanning Head OFV 056 7 3 1 General Data Laser type Wavelength Cavity length Laser class Laser output power Power consumption Operating temperature Storage temperature Relative humidity 7 Technical Specifications helium neon 633nm 203mm Il 1mW ca 15W 5 C 40 C 41 F 104 F 10 C 65 C 14 F 149 F max 80 non condensing
45. Position of the laser warning labels on the scanning head in EC countries 1 2 1 Safety Information 1 2 2 Non EC Countries The laser warning labels for the PSV in non EC countries are shown in figure 1 3 Label 2 is affixed only within the USA Their position on the scanning head is shown in figure 1 4 CAUTION LASER RADIATION DO NOT STARE INTO BEAM Helium Neon Laser 1 mW max cw CLASS Il LASER PRODUCT 2 This equipment conforms to provisions of US 21 CFR 1040 10 and 1040 11 3 DANGER Laser radiation when open AVOID DIRECT EXPOSURE TO BEAM Figure 1 3 Laser warning labels for the PSV in non EC countries Figure 1 4 Position of the laser warning labels on the scanning head in non EC countries 1 Safety Information 1 3 Electrical Safety The PSV complies with the electrical safety class Electrical shock protection is achieved by a fully metallic housing connected to protective ground Please pay attention to the following safety precautions when using the PSV e The PSV controller and the workstation should only be connected via three pin mains cables to an AC mains supply 50 60Hz with a grounded protective conductor with a nominal voltage which corresponds to the voltage set on the voltage selector e The mains voltage input of the workstation can also be designed as a wide range input like the junction box and therefore be connected to all mains voltages with nominal values between
46. SV Z 017 optional 7 11 Appendix A Optional Accessories for the Scanning Head OFV 056 Appendix B Basics of Measurement Procedure Appendix C Functional Description of the Controller Appendix D Declaration of Conformity Index 1 Safety Information 1 Safety Information 1 1 Laser Safety The light source of the PSV is a helium neon laser It is important to understand that laser light has different properties than ordinary light sources Laser radiation is generally extremely intense due to the beam s low divergence and great care should be taken when handling laser instruments that the direct or reflected beam does not enter the eye To ensure this the following precautions have been taken In general Polytec equipment complies with the standards EN 60825 1 DIN VDE 0837 and CFR 1040 10 US The optical output of the laser is less than 1mW providing the equipment is used in the manner for which it was intended This means that the PSV conforms with laser class Il and is generally very safe Even when optimally focused the laser radiation is not intense enough to harm the skin The scanning head has been equipped with a mechanical beam shutter which can be used to block the laser beam during the warm up phase or when the instrument is not in use although switched on The emission indicator on the scanning head indicates the activity of the laser and thus potential harm caused by emitted laser beams The laser is swi
47. YBOARD 3 14 connector MONITOR 3 14 connector MOUSE 3 14 connector PRINTER 3 14 control elements back panel 3 13 interface COM 1 3 14 interface COM 2 3 14 mains connection 3 13 network connector 3 14 port USB 3 14 wrong delivery 3 2 Z zoom video camera 7 8 Polytec Deutschland POLYTEC GmbH Polytec Platz 1 7 D 76337 Waldbronn Tel 07243 604 0 SR 07243 69944 EU info polytec de ende http www polytec de POLYTEC Physik Instrumente Vertriebs und Beratungsb ro Berlin Schwarzschildstra e 1 D 12489 Berlin Tel 030 6392 5140 Fax 030 6392 5141 E mail polytecberlin 9 polytec de Internet http www polytec de Polytec International Germany D POLYTEC GmbH Polytec Platz 1 7 D 76337 Waldbronn Tel 49 7243 604 0 Fax 49 7243 69944 E mail info vi 9 polytec de Internet http www polytec com France F Polytec PI RMP S A 32 rue D lizy F 93694 Pantin C dex Tel 33 1 481039 30 Fax 33 1 481008 03 E mail info Qpolytec pi fr Internet http www polytec pi fr Great Britain GB Lambda Photometrics Ltd Lambda House Batford Mill GB Harpenden Hertfordshire AL5 5BZ Tel 44 1582 764334 Fax 44 1582 712084 E mail info lambdaphoto co uk Internet http www lambdaphoto co uk Japan J PI Polytec KK Akebono cho 2 38 5 Tachikawa shi J Tokyo 190 Tel 81 425 26 7300 Fax 81 425 26 7301 E mail info pi polytec co jp USA East Polytec PI Inc 16 A
48. beam shutter is open or closed 5 1 5 Operating the PSV 5 4 Setting up the Scanning Head Fluid stage Pan tilt stage optional Stand off distance If your PSV is equipped with a tripod and a fluid stage you can manually setup the scanning head using the three hand grips as described in the assembly instruction provided by the manufacturer MANFROTTO If your PSV is equipped with a heavy duty tripod and a motorized pan tilt stage it is easier to setup the scanning head You control the pan tilt stage either with the software refer to your software manual or using the four control keys on the front of the junction box The scanning head can be panned to the left and right by 90 degrees using the control keys and It can be tilted upward and downward by 84 using the control keys T and J Caution Avoid any additional weighting on the pan tilt stage by placing objects on top of the scanning head or attaching things to it This may put strain on the pan tilt stage Please pay also attention to the information on optimal stand off distances for the scanning head provided in section 4 3 5 5 Dust Cover on the Scanning Head 5 2 The scanning head is equipped with a dust cover to protect the scanner mirrors and the front lens of the video camera when you are not making measurements The dust cover is closed by rotating the switch bar on the front of the scanning head into vertical position Caut
49. bility The stand off distance is measured from the front panel of the scanning head The optimal stand off distances are 14mm n 208mm n 0 1 2 i e at 14mm 217mm 420mm 623mm etc The light source of the PSV is a helium neon laser This is a multimode laser in which a maximum of two modes can exist The interference of the two modes leads to the intensity of the resulting optical signal varying periodically with the stand off distance The intensity increases to a maximum i e a maximum of visibility is present if the optical path difference is an even numbered multiple of the length of the laser cavity 203mm As the optical path difference is equal to twice the stand off distance the beam goes there and back a maximum of visibility is present once per laser cavity length In practice it is not usually necessary to search for the maximum of visibility as the PSV is sensitive enough to make a measurement even close to the minimum A minimum is indicated during the warm up phase by periodic fluctuation on the signal level display 4 9 4 Making Measurements 4 10 5 Operating the PSV 5 Operating the PSV 5 1 Switching On and Off Controller Workstation The controller is switched on by turning the key switch on the front panel to position I The LED POWER above the key switch lights up and shows that the controller is ready to operate Is the PSV correctly cabled as described in section 3 4 2 the LED POWER o
50. ce COM 1 9 pin Sub D connector Jack for the RS 232 cable to the junction box to control the video camera 3 15 3 First Steps 3 16 10 11 12 13 Parallel PRINTER connector 25 pin Sub D jack Serial interface COM2 9 pin Sub D connector Jack for the RS 232 cable to the controller to control the PSV via the software AV connector 9 pin Sub D jack Jack for the video cable to the junction box to transmit the video signal MONITOR connector 15 pin Sub D jack ACQUISITION connector for the data acquisition SCSI II type Jack for the acquisition cable to the junction box to transmit both measurement and control signals PSV 300 U The PSV model U has two VHDIC connectors instead of the SCSI II type connector refer to PSV model H DAC connector 62 pin Sub D jack Jack for the DIO DAC cable to the junction box to control the scanner mirrors and the pan tilt stage Air vents Caution These openings must always be kept free to ensure sufficient cooling The distance from the wall should be at least 50mm 3 First Steps 3 4 Installation 3 4 1 Mechanical Assembly Scanning head The scanning head is mounted on either a tripod with fluid stage OFV S2 or a heavy duty tripod with motorized pan tilt stage optional PSV Z 017 The heavy duty tripod can also be mounted on a trolley optional The scanning head mounted on the fluid stage and on the tripod is shown in figure 3 11 Figure
51. d tighten the fiber optic positioning thumbscrew Warning Never look directly at the ring light when the light source is switched on For more information about the light source please refer to the user manual of the manufacturer A 2 Vertical Test Stand PSV Z 018 You can adjust the stand off distance of the mounted scanning head precisely using the vertical test stand shown in figure A 4 The test stand is especially suitable for scanning very small parts with the close up unit on the scanning head bo Figure A 4 Vertical test stand PSV Z 018 with scanning head and close up unit mounted A 5 A Optional Accessories for the Scanning Head OFV 056 Assembly For mounting the scanning head at the telescope drive you proceed as follows 1 Fix the telescope drive at the measurement location using the 6 screws of the assembly kit refer to figure A 5 picture 1 Use either the metric screws or the separately packed screws with thread basing on inch system 1 4 20x 1 2 UNC 2 If applicable undo the quick release hexagonal plate or the mounting plate for the pan tilt head from the scanning head 2 Figure A 5 Mounting the scanning head to the telescope drive A 6 3 Attach the adapter plate on the underside of the scanning head as shown in figure
52. decoder If it lights up permanently the next highest range must be selected refer to section 4 2 1 Analog voltage output for the VELOCITY signal BNC jack The voltage at this output is proportional to the instantaneous vibration velocity of the object to be measured The voltage is positive if the object is moving towards the scanning head CLEAR socket for the displacement decoder BNC jack This socket allows synchronized resetting of the optional displacement decoder This input is only active if a displacement decoder is installed Analog voltage output for the DISPLACEMENT signal BNC jack The voltage at this output is proportional to the instantaneous displacement of the object to be measured The output is only active if a displacement decoder is installed CLEAR key for the displacement decoder Using this key the optional displacement decoder can be reset manually RESET key The controller processor can be reset using this key REMOTE LED The LED lights up if the controller is being operated remotely via one of the interfaces Manual operation with the keys T J on the front panel is also possible however manual settings are not transferred to the software LLO LED This LED lights up when the status LOCAL LOCK OUT has been activated via the software The keys T 4 on the front panel are then deactivated and the controller is operated exclusively via the software Back panel ce GPIB
53. dent of its sign The direction of the velocity can be determined by introducing an additional fixed frequency shift f in the interferometer to which the Doppler shift is added with the correct sign Thus the resulting frequency at the detector fmog is given by E x Equation B 4 Tod fg 2 Interferometers of this type which are directionally sensitive are described as heterodyne B Basics of Measurement Procedure B 2 Optical Configuration in the Scanning Head In Polytec s vibrometers the velocity and displacement measurement is carried out using a modified Mach Zehnder interferometer The optical configuration in the scanning head is shown schematically in figure B 1 Laser BS 1 BS2 2 4 Lens t Object Beam Q G J Reference Scanner Object Beam Y Y Mirrors Bragg Cell 9763 8 CO Detector Figure B 1 Optical configuration in the scanning head The light source is a helium neon laser which provides a linear polarized beam The polarizing beam splitter BS1 splits the beam into the object beam and the reference beam The object beam passes through the polarizing beam splitter BS2 as wellas a i 4 plate is then focussed by the lens on the object and scattered back from there The polarizing beam splitter BS2 then functions as an optical directional coupler together with the A 4 plate and deflects the object beam to the beam splitter BS3 As both arms of the internal interferometer are symmetrical
54. dividual functions please contact our service personnel The tests described here are not meant to lead you to carry out maintenance work yourself but to provide our service personnel with information which is as accurate as possible Testing the PSV is limited to such tests in which the housing does not have to be opened Opening the housing without authorization invalidates the warranty If required please contact our service department Based on your fault description further procedure will be determined If the PSV has to be sent back for repair please use the original packaging and enclose an exact description of the fault 6 1 General Tests If any system component of the PSV does not function properly please first check the following 1 Is the PSV correctly cabled as described in section 3 4 2 2 Are there only original RS 232 cables from Polytec used 1 1 wired 3 Is the transfer rate set to 9600 Baud refer to section 5 12 3 4 f you control the PSV using the software via the IEEE 488 GPIB interface Is the IEEE 488 GPIB address of the controller set to 5 refer to section 5 12 3 Check whether the data acquisition board is correctly installed To do so proceed as follows 5 Double click the icon Measurement amp Automation on the desktop 6 Change into the folder Devices and Interfaces The data acquisition board is correctly installed if in the folder PCI 4451 or PCI 4452 or PCI 6111 is listed If not
55. e 5 9 dust cover on the scanning head 5 2 requirements 3 1 temperature 3 1 operating system workstation 7 10 operating temperature controller 7 1 junction box 7 5 pan tilt stage 7 11 scanning head 7 7 optical configuration in the scanning head B 2 optimal stand off distances 4 9 optimizing focus of the laser beam 5 4 OPTION jacks on the junction box 3 11 organization of the menus in the controller 5 10 oscillator section C 4 OUT1 OUT2 jack on the junction box model H 3 9 output current interfaces junction box 7 6 output impedance 7 2 output impedance interfaces junction box 7 6 output signal testing 6 3 output swing 7 2 output voltage swing interfaces junction box 7 6 output voltage interfaces junction box 7 6 over voltage protection interfaces junction box 7 5 OVER indicator on the controller 3 4 overrange indicator in the software 5 8 on the controller 5 8 P pan tilt stage assembly on the tripod 3 18 cabling 3 27 operating requirements 3 1 setting up the scanning head 5 2 technical specification 7 11 phase difference theory B 1 phase response specification 7 3 phase roll off specific 7 3 phase shift caused by the velocity decoder 4 7 PLL decoder C 4 pointing stability scanner 7 8 position of laser warning labels in EC countries 1 2 in non EC countries 1 3 positioning the laser beam in the software 5 6 using hand set PSV Z 051 5 5 POWER LED on the controller 3 3 LED on the junction box model
56. e and the screws in case you may need them at a later date 7 Now mount the adapter plate on the top of the tripod using the 3 Allen screws M6x16 as also shown in figure 3 13 Ensure that the knob on the underside of the tripod is always tightened securely Adapter plate T Tripod Figure 3 13 Mounting the pan tilt stage on the tripod 8 Screw the connector box on the adapter plate using the 4 Allen screws M8x40 To do this use the Allen key size 6 3 19 3 First Steps 9 Fix the pan tilt stage on the connector box using the 3 Allen screws M8x16 and the washers Caution Make sure that the pan tilt stage is correctly aligned to the connector box The FRONT labeled sides have to be mounted in the same direction 10 Then mount the scanning head with its mounting plate on the pan tilt stage using the 2 Allen screws M6x 16 and the washers as shown in figure 3 14 Caution Make sure that the FRONT labeled sides of the components are mounted in the direction of the front panel of the scanning head Scanning head Mounting plate 2 Allen screws M6 x 16 7 0 Pan tilt stage Figure 3 14 Mounting the scanning head on the pan tilt stage 11 Keep the assembly instructions for the tripod and pan tilt stage in a safe place For cabling the pan tilt stage refer to section 3 4 2 3 20 System cabinet PSV Z 035 optional 3 First Steps You receive the system cabinet
57. e scanning head and on the display of the controller B Basics of Measurement Procedure Appendix B Basics of Measurement Procedure B 1 Theory of Interferometric Velocity and Displacement Measurement Optical interference can be observed when two coherent light beams are made to coincide The resulting intensity e g on a photo detector varies with the phase difference Ag between the two beams according to the equation i Ag T 1 cosAQ Equation B 1 The phase difference Ag is a function of the path difference AL between the two beams according to AL Equation B 2 AQ 27 where is the laser wavelength If one of the two beams is scattered back from a moving object the object beam the path difference becomes a function of time AL AL t The interference fringe pattern moves on the detector and the displacement of the object can be determined using directionally sensitive counting of the passing fringe pattern On scattering from the object the object beam is subjected to a small frequency shift which is called Doppler shift f and is a function of the velocity component in the direction of the object beam according to MI fp 2 Equation B 3 Superimposing object beam and internal reference beam i e two electromagnetic waves with slightly different frequencies generates a beat frequency at the detector which is equal to the Doppler shift The ratio B 3 to determine the velocity is however indepen
58. e system by the software is activated On the front of the controller both LEDs LLO and REMOTE light up 6 Before now opening the beam shutter remember the information on laser safety provided in section 1 1 7 Open the dust cover on the front of the scanning head and the beam shutter on the back The laser beam is now emitted from the scanning head 8 Data acquisition is now fully controlled by the software Once the laser has warmed up you can make measurements as described in your software manual 4 1 4 Making Measurements 4 2 Selecting Suitable Settings 4 2 1 Measurement Range When selecting a suitable measurement range the maximum expected values for velocity acceleration and frequency have to be taken into consideration Orientation purely on the velocity is often not enough as the various measurement ranges have different bandwidths and maximum accelerations The respective values are given in the specifications refer to section 7 1 3 Most of the applications are covered by the 10 YV range It should therefore be selected for initial measurements with the PSV A higher range only has to be selected ifthe overrange indicator OVER on the front of the controller lights up permanently at scan points with high amplitude For low frequency applications the ranges 1 3 V 5 S V and 25V are available These measurement ranges can be used from the frequency OHz full DC capability For both measurement ranges 1 7 V a
59. e workstation and start the PSV software 2 Change to the Acquisition Mode then to Define Scan Points and select the Point Mode as described in your software manual To define scan points select the FREE mode using the MODE key on the hand set LED FREE is lit up PSV Z 051 Figure 5 3 Defining and deleting scan points using the hand set PSV Z 051 3 Using the four arrow keys move the laser beam to the desired position 4 Press the TEACH button and the scan point is defined The newly defined scan point is shown in the software 5 7 5 Operating the PSV Software 5 10 Settings Software Controller 5 Repeat steps 3 and 4 until all desired scan points are defined Note To get a 3D view style of the data you have to define connections in the software Please refer to your software manual To delete defined scan points select the GRID mode using the MODE key on the hand set LED GRID is lit up The TEACH key now functions as DEL key for deleting 6 Using the arrow keys move the laser beam forwards or backwards to the scan point you want to delete 7 Press the DEL key and the selected scan point is deleted 8 Repeat steps 6 and 7 until all desired scan points are deleted Note If you press the DEL key for more than approximately one second the scan points will be deleted one after the other When the PSV is controlled via the software LEDs REMOTE and LLO are lit up
60. eam is blocked 6 3 6 Fault Diagnosis 6 4 7 Technical Specifications 7 1 Controller OFV 3001S 7 1 1 General Data Mains voltage Power consumption Fuses Protection class Operating temperature Storage temperature Relative humidity Dimensions Weight Calibration recommended 7 1 2 Low Pass Filter PSV 300 H 7 Technical Specifications 100 115 230 VAC 10 50 60Hz adjustable on the back panel max 150VA 1 0A slow blow for 230V 2 0A slow blow for 100 115V protective grounding 5 C 40 C 41 F 104 F 10 C 65 C 14 F 149 F max 80 non condensing 450mm x 355 mm x 135mm 10 8kg every 2 years for typ amplitude and phase frequency response refer to section 4 2 2 Filter type Cutoff frequencies Frequency roll off Stop band rejection PSV 300 F U Butterworth 8th order 400 Hz 102 4 kHz adjustable in steps of 400Hz 160dB dec 48dB oct 80dB for typ amplitude and phase frequency response refer to section 4 2 2 Filter type Cutoff frequencies Frequency roll off Stop band rejection Bessel 3rd order 5kHz 20kHz 100kHz adjustable 60dB dec 18dB oct gt 70dB 7 1 7 Technical Specifications 7 1 3 Signal Voltage Output VELOCITY OUTPUT General Data Output swing Output impedance Minimum load resistance Overrange indicator threshold 10V 502 10kQ 0 5 additional error typ 95 of full scale
61. ector on the junction box 3 11 video camera front lens 3 6 technical specification 7 8 video system 7 8 VIDEO jack on the junction box 3 11 visibility maxima of 7 7 voltage selector 3 1 on the controller 3 5 on the workstation model F U 3 15 on the workstation model H 3 13 W warming up 3 1 warning labels in EC countries 1 2 in non EC countries 1 3 position in EC countries 1 2 position in non EC countries 1 3 warranty invalidate 3 2 wavelength scanning head 7 7 weight close up unit A 1 controller 7 1 junction box 7 5 pan tilt stage 7 11 scanning head 7 7 wide range input on the junction box 3 11 on the workstation model F U 3 15 on the workstation model H 3 13 Index workstation black key for On Off 3 13 cabling 3 22 CD ROM drive rewriter 3 13 control elements front panel 3 12 cooling fan 3 12 description 2 1 disk drive 3 13 key RESET 3 12 LED POWER and HDD 3 12 lock in the front flap 3 13 switching on 5 1 technical specification 7 10 workstation model F U air vents 3 16 connector ACQUISITION 3 16 connector AV 3 16 connector DAC 3 16 connector KEYBOARD 3 15 connector MONITOR 3 16 connector MOUSE 3 15 connector PRINTER 3 16 control elements back panel 3 15 interface COM 1 3 15 interface COM 2 3 16 mains connection 3 15 network connector 3 15 port USB 3 15 workstation model H air vents 3 14 connector ACQUISITION 3 14 connector AV 3 14 connector DAC 3 14 connector GENERATOR 3 14 connector KE
62. ence signal to the BNC jack REF on the front of the junction box for the models F and U Only PSV 300 H You can connect two additional reference signals to the BNC jacks REF2 and REF3 on the front of the junction box for the model H If required connect the external trigger signal to the BNC jack TRIG IN on the front of the junction box 3 First Steps JUNCTION BOX PSV Z 040 x T amp gs gt amp LI LI LI CONTROLLER OFV 3001 S INTERFEROMETER ue REMOTE FOCUS LI Li LI Li a HAND SET OFV 310 optional WORKSTATION PSV PC y 3 R3 E fees i Qr AS 2 com 2 z O 4 Qu E A 1 A D r i i 1 1 1 1 1 1 4 i 1 i L LI O KEYBOARD MONITOR 1 1 1 MOUSE Figure 3 16 Cabling of the controller s back panel 3 23 3 First Steps REFERENCE SIGNAL Model H SIGNAL OUTPUTS FUNCTION GENERATOR EXTERNAL TRIGGER SYNC PULSE EE oO 1 i n Y TTL Y sie y ANALOG IN O 4 0 SYNC OUT TRIG IN OUT 1 N REF 1 VELO lt GATE IN OUT2 REF 2 REF3 oor gt A ACOUSTIC GATE UNIT ADDITIONAL REFERENCE SIGNALS Models F and U SIGNAL OUTPUT FUNCTION GENERATOR EXTERNAL TRIGGER SOURCE INPUT Q SIGNAL VELO 2 2 up Ox ACOUSTIC GATE UNIT LI Li SYNC PULSE u REFERENCE SIGNAL VELOCITY OUTPUT Figure 3 17 Cabling of the fron
63. era by 98 A Optional Accessories for the Scanning Head OFV 056 A 2 Close Up Lenses Together with the close up unit a set of close up lenses with different focal distances 1 2 and 4 diopters is delivered A maximum of two close up lenses or one close up lens and the block filter can be mounted The close up lenses are also screwed directly to the camera aperture of the scanning head before mounting the close up unit The stand off distances and the scan fields of the close up lenses and of combinations of the lenses are shown in table A 1 Table A 1 Stand off distances and scan fields of the close up lenses Lens or Stand off min ee Max Spot combination distance Sean field scan field scan field dam X x Y X x Y X x Y Diopters mm mm mm mm um 2 320 450 5x4 20 x 16 70 x 55 40 241 250 350 4x3 16x8 60 x 45 30 4 200 260 3x2 4 12x10 50 x 40 25 4 1 175 215 2 5x2 10x8 45x34 20 4 2 152 175 2x1 6 8x 6 4 40 x 30 15 measured from the front panel of the scanning head at 18x optical zoom 3 with front lens model MR Mounting the Close Up Unit For transportation the close up unit is secured on the back with a transparent perspex plate For mounting the close up unit you proceed as follows 1 Before mounting undo the perspex plate and keep it in a safe place 2 If required first screw the close up lenses or the block filter to the camera aperture 3 Fixthe clo
64. erator TTL input GATE IN BNC jack TTL input for an external gating signal TTL output AUX OUT BNC jack TTL output for special applications programmable via the optional Visual Basic Engine PSV Z 082 Front panelfor The front panel of the junction box for the PSV models F and U is shown in models F U figure 3 6 JUNCTION BOX POWER G Polytee Psv z o40 F Figure 3 6 Front view of the junction box for the PSV models F and U 1 POWER LED The LED lights up when the junction box is correctly cabled to the controller and the key switch on the controller is turned to position The LED indicates that the junction box is ready to operate Control keys for the pan tilt head pan Using these keys the optional pan tilt stage is panned clockwise gt or anti clockwise refer to section 5 4 Alternatively it can be controlled via the software as described in the software manual 3 9 3 First Steps 3 10 10 11 Control keys for the pan tilt head tilt Using these keys the optional pan tilt stage is tilted upward T or downward J refer to section 5 4 Alternatively it can be controlled via the software as described in the software manual TTL input AUX IN BNC jack TTL input for special applications TTL input TRIG IN BNC jack TTL input for an external trigger signal Generator output SIGNAL BNC jack Output signal of the internal function generator PSV 300 U
65. essing units C Functional Description of the Controller The system control manages communication of the controller with the environment via the front panel and workstation interfaces and also the internal setting of all parameters for the individual functional blocks C 2 Signal Conditioning Measurement of the input signal level Stabilization of the signal amplitude Limitation of the bandwidth Dropout reduction via tracking filter C 2 The RF signal from the scanning head first of all has to be pre processed to optimally drive the various demodulators The signal conditioning includes the following functions e Measurement of the input signal level e Stabilization of the signal amplitude e Limitation of the bandwidth e Dropout reduction via the tracking filter e Down mixing of the frequency The measurement of the input signal level is required to provide the user with information of the back scattering properties of the object and as a help to optimally focus the laser beam The level is converted to a logarithmically scaled DC voltage This signal is visualized on the scanning head and on the controller as a bar display and is available at the BNC jack SIGNAL for external usage Stabilization of the signal amplitude is necessary for the following signal processing steps as the input signal level can fluctuate by several orders of magnitude due to the extremely different back scattering properties of the objects
66. ganization of the Menus 5 10 The organization of the menus is shown in figure 5 5 SETTINGS n CONFIG i Figure 5 5 Organization of the controller s menus Menu FOCUS is optional The menus are organized as follows INTRO SETTINGS CONFIG FOCUS The start menu appears after switching on the controller or after RESET This is the most important menu in which all settings for a measurement in stand alone operation are made i e the measurement ranges and the filters are selected It also displays the signal level This menu provides information on the configuration of the controller i e the decoders and interfaces installed The interfaces can be configured in this menu The laser beam can be focused in this menu It also displays the signal level 5 Operating the PSV 5 12 3 The Individual Menus Menu INTRO Menu CONFIG After being switched on or RESET the controller shows that it is ready to operate with the menu INTRO It is not possible to change back to this menu as it does not have a control function This menu provides information on the decoders and interfaces installed The individual configurations are described in the following Velocity Decoder This line shows the velocity decoders installed and the number of available velocity measurement ranges The following abbreviations are used for the individual decoders Table 5 1 Abbreviations of the individual velocity decoders
67. gure 3 18 All connections must be made easily If not check the plugs for bent contact pins to avoid serious damage being incurred Secure the connections correspondingly Should any problems occur in cabling please contact your local Polytec representative Caution Always connect all components to each other before plugging in the mains cables 10 Connect the keyboard to the socket KEYBOARD on the back of the workstation Connect the mouse to the socket MOUSE on the back of the workstation Plug the monitor cable into the back of the monitor and into the socket MONITOR on the back of the workstation To operate the controller via the software plug an RS 232 cable into the jack RS 232 on the back of the controller and into either of the jacks COM1 or COM2 on the back of the workstation If applicable connect the optional hand set OFV 310 to the circular jack REMOTE FOCUS on the back of the controller Plug the Interferometer cable into the Sub D jack INTERFEROMETER on the back of the controller and into the Sub D jack VIBROMETER on the back of the junction box For transmission of the velocity signal plug the BNC cable into the BNC jack VELOCITY OUTPUT on the front of the controller and into the BNC jack VELO on the front of the junction box PSV 300 H If required connect the reference signal to the BNC jack REF 1 on the front of the junction box for the model H PSV 300 F U If required connect the refer
68. ht scattered back The bridging capability is generally better with a high time constant SLOW however it may not be possible to follow highly dynamic signals any more In this case FAST or OFF have to be selected The best setting therefore has to be determined from case to case or be estimated based on the range diagram in figure 4 7 The range diagram shows the dynamic limits for both settings of the tracking filter plotted versus the frequency Velocity m s 10 velocity limit 3 m s ZH 001 uu Aouenbauy 0 01 0 03 0 1 0 3 1 3 10 30 100 300 Frequency kHz Figure 4 7 Operating ranges of the tracking filter A constant velocity limit of approximately 3m s is characteristic for the lower frequency range If the velocity exceeds this value it means that the tracking filer generally has to be switched OFF In the medium frequency range the velocity limit changes over to become an acceleration limit i e the velocity limit decreases in inverse proportion to the frequency In the upper frequency range a constant velocity limit becomes effective again 4 7 4 Making Measurements 4 8 To set the tracking filter the diagram in figure 4 7 can be summarized in the following general rules e For frequencies above 100kHz as a general rule the tracking filter should be switched off In principle it can follow higher frequencies but in this range amplitude errors of up to appr
69. ias filters which are automatically adapted to the bandwidth set PSV 300 H 4 Making Measurements Inthe PSV 300 H low pass filters with 8th order Butterworth characteristics are used Multiples of 0 4kHz up to a maximum of 102 4kHz can be selected for the cutoff frequency The amplitude error in the pass band can be roughly estimated as follows e Up to 75 of the cutoff frequency the maximum amplitude error is 196 e At the cutoff frequency the amplitude error is 3dB approx 30 The phase shift increases with the frequency as shown in figure 4 3 Up to approximately 5096 of the cutoff frequency the phase shift increases proportionally to the frequency The complete amplitude frequency response of an 8th order Butterworth low pass filter is shown in figure 4 1 The frequency is normalized to the cutoff frequency f Amplitude dB 20 40 60 80 100 t 0 01 0 02 0 05 0 1 0 2 0 5 1 2 5 9 Figure 4 1 Amplitude frequency response of an 8th order Butterworth low pass filter 4 3 4 Making Measurements The amplitude error in the pass band caused by the filter can be determined from figure 4 2 Amplitude error 1 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 Figure 4 2 Amplitude error of an 8th order Butterworth low pass filter The phase frequency response of the filter is shown in figure 4 3 phase degrees 0
70. inuous Velocity stages Max velocity Min travel Max travel Dimensions Weight 230V 50Hz or 115V 50 60Hz 24VDC 5A IP66 0 C 40 C 32 F 104 F 130 mm x 80 mm x 360mm 2 8kg IP30 10 C 40 C 50 F 104 F max 1 min 9min break max 2 5 min 3 5 5mm s approx 0 1mm 300mm 180mm x 180mm x 590mm 300 mm throw 13 8kg A 7 A Optional Accessories for the Scanning Head OFV 056 A 3 Hand Set OFV 310 optional A 8 You can focus the laser beam using the optional hand set OFV 310 shown in figure A 7 Note Never use the optional hand set OFV 310 together with the hand set PSV Z 051 refer to section 5 6 S V SIGNAL FOCUS Polytee OFV 310 FOCUS CONTROL A Figure A 7 Hand set OFV 310 The optional hand set OFV 310 is connected to the jack REMOTE FOCUS on the back of the controller Using the two keys the laser beam is focused as follows e Focusing on infinity key A e Focusing close up key V If you press the keys for more than approximately one second the motor switches over to fast mode For fine positioning the keys can be repeatedly pressed briefly At the end of the adjustment range the motor stops automatically and the respective directional symbol A or V lights up There is also a signal level display on the hand set which helps you to optimize the focus The signal shown is identical to that on th
71. ion To protect the lenses and scanner mirrors only open the dust cover when your are making measurements 5 Operating the PSV 5 6 Focusing the Laser Beam Hand set The hand set PSV Z 051 is connected to the circular jack REMOTE PSV Z 051 CONTROL on the front of the scanning head You can focus the laser beam using the emphasized part of the hand set shown in figure 5 1 PSV Z 051 O FAR G Polytec Figure 5 1 Focusing the laser beam using the hand set PSV Z 051 Note Never use the hand set PSV Z 051 together with the optional hand set OFV 310 refer to section A 3 Using the two arrow keys FAR and NEAR the laser beam is focused as follows e Focusing on infinity key T FAR e Focusing close up key 4 NEAR If you press the keys for more than approximately one second the motor switches over to fast mode For fine positioning the keys can be repeatedly pressed briefly At the end of the adjustment range the motor stops automatically and the respective LED FAR or NEAR lights up Beside the keys for focusing there is a signal level display which helps you to optimize the focus The signal shown is identical to that on the scanning head and on the display of the controller 5 3 5 Operating the PSV Software When the PSV is controlled via the software LEDs REMOTE and LLO are lit up you can use the software to focus the laser beam please refer to your software manual Controller Whe
72. ion 7 1 theory description C 5 low pass filter suitably setting for PSV model F U 4 5 for PSV model H 4 3 M Mach Zehnder interferometer B 2 main connector on the scanning head 3 8 mains connection 3 1 cabling 3 27 on the controller 3 5 on the junction box 3 11 on the workstation model F U 3 15 on the workstation model H 3 13 mains switch on the controller 3 3 mains voltage controller 7 1 junction box 7 5 workstation 7 10 maintenance requirements 3 1 malfunctions 6 1 maxima of visibility 4 9 7 7 measurement procedure basics B 1 measurement range set in the controller 5 12 suitably setting 4 2 technical specification 7 2 measurements making 4 1 setup 4 1 switching on 4 1 measuring 4 1 vi menu in the controller CONFIG 5 11 FOCUS 5 12 INTRO 5 11 SETTINGS 5 12 micro scan lenses assembly A 4 fiber optical ring light A 5 for the close up unit A 4 stand off distances scan fields A 4 mixing frequency C 4 models summary 2 2 MONITOR connector on the workstation model F U 3 16 on the workstation model H 3 14 mounting holes for the coaxial unit 3 6 MOUSE connector on the workstation model F U 3 15 on the workstation model H 3 14 N network connector on the workstation model F U 3 15 on the workstation model H 3 14 no laser beam test on fault diagnosis 6 2 no velocity signal test on fault diagnosis 6 3 O opening up the equipment 3 2 operating controller without softwar
73. is the DC capability of the measurement ranges 125 V and 1000 V For detailed information please request the respective application note The OVD O4HF is a special version of the OVD 04 which provides an extended frequency range up to 1 5MHz when operating in the measurement ranges 25TYV 125 7 V and 1000 X v The PLL DC is a decoder which has been specially developed for applications at the lower end of the velocity and frequency range of vibrations It is an excellent supplement to the broad band decoder OVD 04 as with its three measurement ranges 1 TYV 5 3 V and 25 YV it extends the application range for low frequencies to cover also very low velocities The lower frequency limit of the PLL DC is OHz i e there is no amplitude roll off at very low frequencies Thus it is optimally suited for vibration measurements over long distances on buildings or other structures with low resonance frequencies C Functional Description of the Controller C 4 2 Operating Principle The velocity decoder determines the essential measurement properties of the vibrometer Velocity decoding is in principal an FM demodulation process which converts the velocity dependent Doppler frequency of the interferometer signal into an AC voltage The linearity and bandwidth of the demodulator determine the accuracy of the vibrometer In contrast to FM radio which works with the same modulation procedure considerably higher frequency deviations occur in the vibr
74. it both measurement and control signals DAC connector 62 pin Sub D jack Jack for the DIO DAC cable to the junction box to control the scanner mirrors and the pan tilt stage Air vents Caution These openings must always be kept free to ensure sufficient cooling The distance from the wall should be at least 50mm 3 First Steps Back panel for The back panel of the workstation for the PSV models F and U is shown in models F U figure 3 10 The order of the boards can be different from the picture ACQUISITION PRINTER MONITOR Figure 3 10 Rear view of the workstation for the PSV models F and U Mains connection combination Mains socket with a mains switch and mains voltage selector Instead of using the voltage selector the mains voltage input can also be designed as a wide range input refer to section 3 1 The mains switch disconnects the workstation from the mains position O and is used to turn it off in case of danger If applicable always check the setting of the mains voltage selector before connecting the Caution workstation to the mains MOUSE connector 6 pin circular jack KEYBOARD connector 6 pin circular jack Network connector Jack of the Ethernet network board USB port Universal Serial Bus Alternative jack for peripheral devices like mouse keyboard etc Serial interfa
75. l check the following 1 Is the PSV correctly cabled as described in section 3 4 2 2 Puta matt white test surface such as a piece of paper at approximately 20 cm from the front panel of the scanning head in the beam path Does the signal level display react If the signal level display does not react the input section of the controller is faulty Check the correct function of the data acquisition board and the software as follows 3 Disconnect the BNC cable for the velocity signal from the BNC jack VELO on the front of the junction box 4 Feed the signal of a function generator to this BNC jack 5 Display the time signal in an analyzer as described in your software manual The data acquisition board and the software work properly if the signal of the function generator is displayed correctly In this case there is a problem in the controller Now check the output signal of the controller as follows 6 Re connect the velocity signal to the BNC jack VELO on the front of the junction box 7 Display the time signal in an analyzer as described in your software manual 8 Set the measurement range to 10 YV Does the output signal react to the test surface moving 9 Ifthe output signal does not react check whether a significant DC offset is present Normally a DC voltage of less than 50mV is measured 10 Block the laser beam Is the output signal noisy or is a straight line shown Noise must occur when the laser b
76. l elements back panel 3 5 control elements front panel 3 3 cooling fan 3 5 description 2 1 display 3 3 focusing the laser beam via the 5 4 functional description C 1 mains connection 3 5 mains switch 3 3 menu CONFIG 5 11 menu FOCUS 5 12 menu INTRO 5 11 menu SETTINGS 5 12 operating without software 5 9 organization of the menus 5 10 overrange indicator 5 8 RF signal conditioning C 2 switching on 5 1 controller interface EXT DEC 3 6 IEEE 3 5 REMOTE FOCUS 3 6 RS 232 3 5 controller jack CLEAR 3 4 DISPLACEMENT 3 4 SIGNAL 3 5 VELOCITY OUTPUT 3 4 controller key CLEAR 3 4 FUNCTION 3 3 RESET 3 4 SETTING 3 4 controller LED LLO 3 4 OVER 3 4 POWER 3 3 REMOTE 3 4 controller specification amplitude frequency response 7 3 amplitude linearity 7 3 calibration accuracy 7 2 general data 7 1 harmonic distortion 7 4 interfaces 7 4 low pass filter 7 1 measurement ranges 7 2 phase frequency response 7 3 signal voltage output 7 2 cooling 3 1 cooling fan on the controller 3 5 on the junction box 3 12 on the workstation 3 12 cutoff frequency low pass filter 7 1 D DAC connector on the workstation model F U 3 16 on the workstation model H 3 14 data acquisition board technical specification 7 10 testing 6 3 DC offset max 7 2 deflection scanner 7 8 depth of field micro scan lenses A 4 description controller 2 1 junction box 2 1 low pass filter theory C 5 scanning head 2 1 velocity decoder C 4 workstation
77. l which synchronizes the oscillator is generated in the phase detector which monitors the phase difference between the input signal and the oscillator signal The dynamic characteristics of the configuration are mainly determined by the internal low pass filter The maximum acceleration which the tracking filter can still follow depends on the filter bandwidth The low pass time constant is switched between SLOW and FAST via the system control and thus adapts the dynamic characteristics to the application The tracking filter can be turned off via a bypass if the accelerations are too high or in the case of good optical signals off L Output Phase Low pass vco Amplifier detector filter on Input V Dan u ceel ZN Control Bus Figure C 2 Block diagram of the tracking filter circuit Down mixing of the frequency in the input section is required to convert the carrier frequency of the input signal from 40 4 MHz originally to lower intermediate frequencies With these intermediate frequencies the velocity decoder can work optimally in the individual measurement ranges Down mixing is carried out by a mixing process which does not affect the modulation content of the FM signal The variable frequency f o is produced by the so called local oscillator in a fixed relationship to the drive frequency of the Bragg cell C 3 C Functional Description of the Contr
78. lbert Street Auburn MA 01501 Tel 1 508 832 34 56 Fax 1 508 832 0506 E mail info polytecpi com Internet http www polytecpi com USA West Polytec PI Inc 1342 Bell Avenue Suite 3A Tustin CA 92780 Tel 1 714 850 1835 Fax 1 714 850 1831 E mail info polytecpi com Internet http www polytecpi com Man Vib PSV300 0802 06e
79. ller and into a wall socket providing protective grounding 26 If applicable plug a mains cable into the connector box of the pan tilt stage and into a wall socket providing protective grounding Caution Always check the setting of the voltage selector on the connector box of the pan tilt stage before connecting to the mains The PSV is now completely installed Carry out a functional test as described in section 3 5 3 27 3 First Steps 3 5 Functional Test For an initial functional test of the PSV you proceed as follows Preparing 1 2 Switching on 4 Test 8 10 Install the PSV as described in section 3 4 Make sure that the key switch on the controller is in position O and the beam shutter on the scanning head is in position OFF Position the scanning head roughly such that its laser beam aperture points to a test surface Switch the controller on by turning the key switch to position On the front of the controller the LED POWER lights up Providing all connecting cables have been installed correctly the LED POWER on the front of the junction box and the emission LED LASER on the scanning head also light up Laser light is not yet emitted as the beam shutter is still closed Switch on the workstation start the PSV software and change to the Acquisition Mode as described in your software manual On changing to the Acquisition Mode control of the system by the software is activated On
80. lt von Issued l d M Polytec GmbH Datum Date Figure D 1 PSV 300 declaration of conformity D Declaration of Conformity D 2 Index A acceleration max 7 2 acclimatization period 3 1 acoustic gate unit cabling 3 25 ACQUISITION BOARD connector on the junction box 3 11 ACQUISITION connector on the workstation model F U 3 16 on the workstation model H 3 14 additional error max 7 3 air vents 3 1 on the scanning head 3 8 on the workstation model F U 3 16 on the workstation model H 3 14 amplitude error calibration accuracy 7 2 amplitude linearity specification 7 3 amplitude response specification 7 3 angle of rotation pan tilt stage 7 11 angle of view video camera 7 8 angular resolution scanner 7 8 aperture diameter 7 7 aperture ofthe laser beam 3 7 assembly close up unit A 2 micro scan lenses A 4 scanning head 3 17 system cabinet 3 21 tripod with fluid stage 3 18 tripod with pan tilt stage 3 18 vertical test stand A 6 AUX IN jack on the junction box model F U 3 10 AUX OUT jack on the junction box model F U 3 10 jack on the junction box model H 3 9 AV connector on the workstation model F U 3 16 on the workstation model H 3 14 B back panel controller 3 5 junction box 3 11 scanning head 3 7 workstation model F U 3 15 workstation model H 3 13 backlash pan tilt stage 7 11 baud rate 5 11 7 4 7 5 beam shutter on the scanning head 3 8 5 1 black key on the work
81. maintain the synchronized condition approximately even if the input signal is temporarily lost The mechanical analog for this design is a flywheel which may lose a small portion of its energy if the driving force is briefly interrupted but continues to run at almost the same number of revolutions per minute and can Down mixing of the frequency C Functional Description of the Controller drive a subsequent mechanism without disruption It is easy to see that this effect gets better the higher the inertia of the wheel is Atthe same time the flywheel however loses the ability to follow rapid changes in the revolutions per minute i e tne dynamic response of the drive system gets worse The same correlation also applies to the electronic tracking filter which thus always represents a compromise between the regeneration effect and the dynamic tracking behavior of the input signal Basically good dropout elimination or noise suppression is always involved with limited dynamic response Ifthe maximum acceleration is exceeded the synchronization between the input signal and the oscillator is lost the tracking filter loses lock which leads to drastic signal distortions at the signal output Practical advice for setting the tracking filter can be found in section 4 2 3 The internal structure of the tracking filter circuit is shown in figure C 2 The function of the voltage controlled oscillator VCO has already been mentioned The control signa
82. n the front of the junction box also lights up and shows that the junction box is ready to operate Also the LED LASER on the scanning head lights up and shows that the scanning head is ready to operate and that the laser is active even ifthe beam shutter is closed refer to section 5 2 and section 5 3 To switch on the workstation set the main switch on the back to position Then open the front flap using the key and push the black button 5 2 Blocking the Laser Beam The scanning head is equipped with a beam shutter This can be used to block the laser beam without switching off the laser thus keeping the system in thermal equilibrium The rotary knob for the beam shutter is on the back of the scanning head and is labeled EMISSION ON OFF To block the laser beam turn the knob clockwise until the red mark points at OFF Warning Only switch the beam shutter to the ON position when you are making measurements Warning To position the scanning head switch the beam shutter to the OFF position Only when the head is roughly in place and has been fixed in a stable position switch the beam shutter to ON for precise adjustment 5 3 Indicating Laser Activity On the back of the scanning head the LED LASER below the rotary knob of the beam shutter indicates the laser activity The LED is lit when the laser is active key switch on the front of the controller in position I The LED is lit regardless of whether the
83. n conditions Amplitude Frequency Response Flatness j Measurement range an e Max additional error referred to f 2 1kHz ecoder mm y PLL DC 1 0 Hz 15 kHz 0 1dB 15 kHz 20 kHz 0 1dB 0 25dB 5 and 25 0 Hz 20 kHz 0 1dB 20 kHz 50 kHz 0 2dB OVD 04 10 0 5 Hz 10 Hz 0 5dB 10 Hz 20 kHz 0 05dB 20 kHz 100 kHz 0 05dB 0 2dB 100 kHz 200 kHz 0 05dB 1dB 25 125 and 1000 0 5 Hz 10 Hz 0 5dB 10 Hz 20 kHz 0 05dB 20 kHz 100 kHz 0 15dB 100 kHz 200 kHz 0 3dB 200 kHz 1 MHz 0 8dB The measurement ranges of this decoder can be used from the frequency OHz full DC capability PSV 300 F only Phase Frequency Response With the low pass filter switched off the velocity decoder behaves as a system of constant time delay up to approximately 6096 of the maximum frequency of the measurement range set i e the phase shift is proportional to the frequency The phase shift depends however on the range settings Mud ieri Time delay typ Specific jos roll off p H U F H U F IN us us kHz kHz PLL DC 1 24 24 8 6 8 6 5 7 1 7 1 2 6 2 6 25 6 0 6 0 2 2 2 2 OVD 04 10 6 1 6 1 2 2 2 2 25 5 5 1 9 2 0 0 7 125 5 5 1 9 1 9 0 7 1000 3 5 0 9 1 3 0 33 7 3 7 Technical Specifications Harmonic Distortions Measurement range S V THD f 1kHz up to 70 of full scale range up to full scale 1 5
84. n the controller is operated without the software you can focus the laser beam via the menu FOCUS refer to section 5 12 3 Hand set To focus the laser beam you can also use the optional hand set OFV 310 OFV 310 instead of the hand set PSV Z 051 refer to section A 3 optional 5 7 Optimizing the Focus of the Laser Beam The signal level display helps you to optimize the focus of the laser beam The signal level is shown as a bar display e on the back of the scanning head e onthe display of the controller e inthe software refer to your software manual e onthe hand set PSV Z 051 refer to section 5 6 onthe optional hand set OFV 310 refer to section A 3 5 4 5 Operating the PSV 5 8 Positioning the Laser Beam Hand set PSV Z 051 The hand set PSV Z 051 is connected to the circular jack REMOTE CONTROL on the front ofthe scanning head You can position the laser beam using the clearly visible part of the hand set shown in figure 5 2 To do so proceed as follows 1 Switch on the workstation and start the PSV software 2 Change to the Acquisition Mode as described in your software manual PSV Z 051 Figure 5 2 Positioning the laser beam using the hand set PSV Z 051 3 Press the MODE key on the hand set to select the kind of movement The laser beam can be positioned in the GRID mode or in the FREE mode GRID mode LED GRID is lit up You move the laser beam on already defined scan points using the a
85. nd 5 YV please pay attention to the information on setting the tracking filter provided in section 4 2 3 For high frequency applications the top three ranges of model PSV 300 F 25 V 125V 1000 27 V provide an extended frequency range of up to 1 5 MHz which can be digitally processed up to 1 MHz by the software If either the positive or negative end of the measurement range is reached the overrange is indicated in the software and the indicator OVER on the front of the controller lights up As a general rule the next highest measurement range should then be selected Please note however that the indicator is activated by very short overrange already which could be caused by noise spikes In such cases the measurement range can be retained as long as it is suitable for the amplitude of the required signal Observing the signal in the time domain will provide clarification on this 4 2 2 Low Pass Filter 4 2 The controller is equipped with an adjustable analog low pass filter which adapts the bandwidth of the measurement signal to the application When displaying a signal in the time domain the signal to noise ratio can be improved by limiting the bandwidth to the necessary extent When analyzing in the frequency domain this filter has no additional benefit With the filter switched on its influence on both amplitude and phase of the velocity signal has to be taken into consideration Note that the software uses appropriate antial
86. ne 4 2 4 2 1 Measurement Range ssssssssssssseee eene hehe nen hhee ene rh nenne nennen 4 2 4 2 2 Low Pass Filter iie hr UG EE RE E e RE enses EE ER ERE REP 4 2 4 2 3 Tracking Filter ert e ete tester eei pete oa Het ene Pe Ebo ids 4 7 4 3 Optimal Stand off Distances for the Scanning Head sssseeeeennne 4 9 5 Operating the PSV 5 1 5 1 Switching Omand Off x ord c xi dr eo ier a ree ada tuu 5 1 5 2 Blocking the Laser Beam u an ebenen Deren 5 1 5 3 Indicating Laser Activity oane e AeA EANET ANEA E PEER INE KE KARATEA nnn hn hen nennen nnn 5 1 5 4 Setting up the Scanning Head uussssssnnssnnnnnnnnnnneennnnnnnnnnnnnnnnnnnnnnnnnenen nn nnn nennen nnns 5 2 5 5 Dust Cover on the Scanning Head sssssssssssssseeeeeenenee nennen hne n nennen nnns 5 2 5 6 Focusing the Laser Beam oreore rasa Hann NAE ENEE E A a EEE 5 3 5 7 Optimizing the Focus of the Laser Bean 44444smnssnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnen 5 4 5 8 Positioning the Laser Beam eerren a a e EE TE EA h nennt ennt nennen 5 5 Contents 5 9 Defining and Deleting Scan Points APS uusssssssnsssnnnnnnnnnnnnennnnnnnnnnnnnnnnnnnnnnnnnnnen nen 5 7 510 Setting rete 5 8 5 11 Overrange Indicator 0 eee eee eee eee eee reer eee eee sese ne eee arn nnn 5 8 5 12 Operating the Controller without the Software uussssssssssssnnnennnenennnnnnnnnnnnnnnnnnnnnnne nennen 5 9 512 1 Operating Philos
87. ns cable heavy duty tripod with motorized pan tilt stage connector box and mains cable PSV Z 017 instead of the OFV S2 PSV 300 H generator cable for the internal function generator PSV 300 U hand set PSV Z 051 coaxial unit OFV 056 C acoustic gate unit PSV Z EQ with BNC cable System cabinet PSV Z 035 hand set OFV 310 vertical test stand PSV Z 018 Caution Protect the unpacked scanning head from hard jolts as these can lead to misalignment of the interferometer Please pay attention to the following steps when unpacking the PSV Check the packaging for signs of unsuitable handling during transport 2 After unpacking check all components for external damage scratches loose screws etc In the case of a wrong delivery damage or missing parts inform your local Polytec representatives immediately and give them the serial numbers of the instruments The identification labels can be found on the back of the instruments and also on the inside cover of this manual 3 First Steps 4 Carefully retain the original packaging in case you have to return the PSV Install the PSV as described in section 3 4 and carry out a functional test as described in section 3 5 3 3 Control Elements 3 3 1 Controller Front panel The front panel of the controller is shown in figure 3 1 C POWER X G Polytee orv 3001 S VIBROMETER CONTROLLER VELOCITY OUTPUT OVER
88. nt data 2 1 2 Introduction 2 2 The Range of the PSV Models The decoders and filters in the controller as well as the data acquisition board in the workstation determine the characteristics ofthe PSV Depending on the application there are three different models on offer their characteristics are summarized in table 2 1 Table 2 1 Summary of the PSV models PSV Model PSV 300 H PSV 300 F PSV 300 U High Performance High Frequency Universal Controller Velocity decoder OVD 04 PLL DC OVD 04 HF PLL DC OVD 04 PLL DC Measurement ranges 1 5 10 25 125 1 5 10 25 125 1 5 10 25 125 mm V 1000 1000 Maximum frequency 250kHz 1 5MHz 250kHz Filter 400 Hz 102kHz 5 20 100kHz 5 20 100kHz Digital Data acquisition board PCI 4452 sianal PCI 6111 PCI 4451 9 nternal function generator PCI 6711 processing Maximum bandwidth 80kHz 1MHz 40kHz Input channels 4 2 2 simultaneously Output channels of the 3 1 1 internal function generator The information in brackets is optional 2 2 3 First Steps 3 First Steps 3 1 Operating and Maintenance Requirements Operating environment Mains connection Assembly Connecting cables Warming up Cooling Cleaning Pan tilt stage Installing other components The PSV can be operated in dry rooms under normal climate conditions refer to specifications in chapter 7 In particular the optical components in
89. oard 7 10 junction box 7 5 pan tilt stage 7 11 scanning head 7 7 workstation 7 10 telescope drive for the test stand assembly A 6 cabling A 6 technical specification A 7 test stand for scanning small parts A 5 testing on functional test 3 28 theory of the measurement procedure B 1 threshold overrange indicator 7 2 time delay 7 3 tracking filter block diagram C 3 dropout reduction via C 2 set in the controller 5 12 suitably setting 4 7 TRIG IN jack on the junction box model F U 3 10 jack on the junction box model H 3 9 tripod assembly with fluid stage 3 18 assembly with pan tilt stage 3 18 U underside of the scanning head connector for the pan tilt stage 3 6 unpacking of the components 3 2 unsuitable handling 3 2 USB port on the workstation model F U 3 15 on the workstation model H 3 14 Index V VELO jack on the junction box model F U 3 10 jack on the junction box model H 3 9 velocity decoder amplitude frequency response 7 3 calibration accuracy 7 2 description C 4 display on the controller 5 11 functional description C 5 measurement ranges 7 2 phase frequency response 7 3 set in the controller 5 12 velocity filter set in the controller 5 12 velocity measurement theory B 1 VELOCITY OUTPUT jack on the controller 3 4 technical specification 7 2 velocity range set in the controller 5 12 velocity signal testing for fault diagnosis 6 3 vertical test stand A 5 assembly A 6 cabling A 6 VIBROMETER conn
90. oller C 3 Oscillator Section The oscillator section generates all drive frequencies for operating the other subassemblies in the vibrometer The drive frequency for the Bragg cell is of central importance as it directly determines the optical frequency offset in the interferometer and thus the center frequency of the carrier signal The variable mixing frequency f o is automatically set by the system control dependent on the selected velocity measurement range C 4 Velocity Decoder C 4 1 The Various Velocity Decoders OVD 04 OVD 04 HF PLL DC C 4 Technically it is just about impossible to attain all desirable and realizable characteristics of the velocity decoder in a single universal subassembly The modular concept of the controller thus permits the use of three different velocity decoders whereby a maximum of two can be installed at the same time The selection of the decoders depends on the application The models available are the OVD 04 OVD 04HF and PLL DC which feature the following characteristics The OVD 04 as a broad band decoder is suitable universally for almost all vibrometer applications in the frequency range up to 250kHz Four measurement ranges from 10 27 V to 1000 2 V cover most technical applications with sufficient amplitude resolution Characteristic is the excellent amplitude and phase frequency response with extremely good amplitude flatness up to the highest frequencies A special feature of the OVD 04
91. ometer which make significantly higher demands on the demodulators FM radio max frequency deviation 75 kHz max modulation frequency 53kHz Stereo Vibrometer max frequency deviation 32MHz max modulation frequency 1 5 MHz In the OFV 30018 controller different respectively optimally adapted demodulators are switched on in the individual velocity measurement ranges The decoders and measurement ranges are selected via the system control and the internal bus At the same time the corresponding settings on the subassemblies oscillator and signal conditioning are carried out internally C 4 3 Low Pass Filter The signal generated by the FM demodulator always contains spurious RF components and its noise bandwidth corresponds with the maximum frequency of the respective measurement range A subsequent low pass filter suppresses the RF components and limits the noise bandwidth according to its cutoff frequency This makes a rough adaptation of the measurement bandwidth to the application possible which makes the signal evaluation in the time domain significantly easier due to the improved signal to noise ratio The filters are adjusted via the system control In position OFF the low pass filter has no effect With the filter switched on its influence on both amplitude and phase of the measurement signal has to be taken into consideration The filter characteristics as well as rules of thumb for using them are provided in section 4 2 2
92. on the workstation On Off 3 13 RESET 3 12 KEYBOARD connector on the workstation model F U 3 15 on the workstation model H 3 14 L laser activity indicating 5 1 laser beam aperture 3 7 optimizing the focus 5 4 testing for fault diagnosis 6 2 laser beam blocking 5 1 laser beam focusing in the software 5 4 using hand set OFV 310 optional A 8 using hand set PSV Z 051 5 3 via the controller 5 4 laser beam positioning in the software 5 6 using hand set PSV Z 051 5 5 laser class scanning head 7 7 laser output power 7 7 laser safety 1 1 laser type scanning head 7 7 laser warning labels in EC countries 1 2 in non EC countries 1 3 position in EC countries 1 2 position in non EC countries 1 3 laser wavelength theory B 1 LASER LED on the scanning head 3 7 LED LASER on the scanning head 3 7 Index LED POWER on the junction box model F U 3 9 on the junction box model H 3 8 LED POWER and HDD on the workstation 3 12 LED on the controller LLO 3 4 OVER 3 4 POWER 3 3 REMOTE 3 4 lens video camera 7 8 level measurement of the input signal C 2 limitation of the bandwidth C 2 linearity error max 7 3 LLO LED on the controller 3 4 load capacity interfaces junction box 7 6 load max pan tilt stage 7 11 load resistance interfaces junction box 7 6 load resistance min 7 2 lock in the front flap on the workstation 3 13 low pass filter set in the controller 5 12 suitably setting 4 2 technical specificat
93. opliy o itte tei kennen 5 9 5 12 2 Organization of the Menus ssssssssssssssssssseeeeeneeneeeee nen n nnne nennen nn nennen nna 5 10 12 3 The Individual Menus eet epe eniti reta tee den 5 11 Fault Diagnosis 6 1 SN MEC TITIO ER ea a a Ein REISE 6 1 6 2 No Laser Beam aoo eoo ode ea le aas 6 2 6 3 No Velocity Signal ren er Bi Sed e Lea 6 3 Technical Specifications 7 1 4 Controller OFV 3001 Sinn enter aueh sei eese ek up ipee en Eon d ev oda 7 1 Tell GeneraliDataz i Eee e RER de aetate b e etg Eee eae 7 1 7 1 2 Low Pass Filter o teo a et nes chek ette Meise 7 1 7 1 3 Signal Voltage Output VELOCITY OUTPUT sseeeeeeenemmeeennennen nnn 7 2 FA II TREE 7 4 7 2 Junction Box PSV Z 040 5 m eM aa ee EE e eau op ea E ODER de OPER RE das 7 5 2 1 General Data nce ce p gaaanz nie FER GRE LER 7 5 722 ape 7 5 7 3 Scanning Head OFV 056 usssnnssnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnenn nn nnnnnnnnnnnnnnnnnennnnnnnn 7 7 1 8 1 General Data i tae Rn lin In anni 7 7 TBD OPCS ee 7 7 1 3 3 SCANNEr ar RE ETE EEEE EE A E A seinen 7 8 TOA Vdeo CAMO a cae redes Let ia elle EER PE et Re pee dans 7 8 7 3 5 DIMENSIONS 5 56225 dd een MER REL nee nn nn Weed ERE ERE CUM Eher ate 7 9 7 4 Workstation PSV POr an nn EV re naue ab ag Ye YR RE Ea o ena ddr ea ao 7 10 7 5 Motorized Pan Tilt Stage P
94. oximately 1096 can occur due to dynamic errors e For medium velocities and frequencies the acceleration limits of the tracking filter have to be taken into consideration The optimal setting must be found with the diagram If the velocity or acceleration limits are exceeded the tracking filter loses lock refer to section C 2 This will cause serious signal distortions an example of which can be seen in figure 4 8 200 100 E E v 0 5 2100 amp 200 0 50 100 150 200 Time us 200 2 100 E E w 0 T gm 200 0 50 100 150 200 Time ps Figure 4 8 True velocity signal top and signal when the tracking filter loses lock bottom The upper trace in figure 4 8 shows the sinusoidal velocity signal with the tracking filter in position OFF The lower trace shows the velocity signal with the tracking filter in position SLOW The tracking filter is on the limit of the range where it loses lock the signal is partly distorted e Inthe measurement ranges 1 S V 57V and 10 YV the tracking filter should be set to SLOW as a general rule e Using the velocity decoder PLL DC the tracking filter is particularly important For technical reasons the PLL DC is more sensitive to dropouts than the decoder OVD 04 Thus the tracking filter should be set to SLOW as long as the acceleration limit is not exceeded refer to figure 4 7 4 Making Measurements 4 3 Optimal Stand off Distances for the Scanning Head Maxima of visi
95. please check whether the data acquisition board is properly inserted into its slot in the workstation 6 1 6 Fault Diagnosis 6 2 No Laser Beam 6 2 If no laser beam is emitted check the following 1 Is the PSV correctly cabled as described in section 3 4 2 2 Is the key switch on the front of the controller in position 3 Is the dust cover on the front of the scanning head open switch bar in horizontal position 4 Is the beam shutter on the back of scanning head in position ON 5 Is the LED LASER on the back of the scanning head lit up Warning Always disconnect from the mains before checking the fuses If the LED is not lit up it can be assumed that there is a fault with the power supply of the controller In this case disconnect the mains plug and check the fuses on the back panel Please note that there are two active fuses which can both lead to failure 6 Is the LED POWER on the front of the junction box lit up Warning Always disconnect from the mains before checking the fuses If the LED is not lit up it can be assumed that there is a fault with the power supply of the junction box In this case disconnect the mains plug and check the fuses on the back panel Please note that there are two active fuses which can both lead to failure 6 Fault Diagnosis 6 3 No Velocity Signal Data acquisition Output signal If the laser beam is emitted but there is no velocity signa
96. reviated as described above in table 5 1 Note If the DC decoder is selected and the velocity measurement range 1 TYV is set it is not possible to change to the HF decoder because the HF decoder does not have this velocity measurement range available Velocity Range In this line you can set the velocity measurement range The possible settings depend on the velocity decoder selected You will find information on setting the velocity measurement range in section 4 2 1 Velocity Filter In this line you can set the cutoff frequency of the low pass filter The possible settings depend on the PSV model In position OFF the upper frequency limit of the active velocity decoder is shown You will find information on setting the low pass filter in section 4 2 2 Signal This line shows the optical signal level as a bar display In this menu the laser beam is focused using the and keys The movement of the motor to position the front lens is shown on the display of the controller with following symbols lt and gt Motor is running slowly lt lt and gt gt Motor is running quickly I lt lt and gt gt I Motor has stopped at the end of the adjustment range The bar in the lower line of the display shows the optical signal level 6 Fault Diagnosis 6 Fault Diagnosis Simple tests are described in the following which you can carry out yourself in the case of malfunction In the case of more difficult faults in in
97. rrow keys The order in which the software approaches the scan points is determined by an internal algorithm Using the keys or T you move the laser beam forwards along the scan points and backwards using the keys or J If you press the HOME key the laser beam is positioned on the first scan point Note The longer you hold the arrow key pressed the faster the laser beam moves 5 5 5 Operating the PSV Software 5 6 FREE mode LED FREE is lit up You move the laser beam freely using the arrow keys To do so press the arrow key for the direction you require If you press the HOME key then the laser beam is positioned so that it is emitted from the scanning head perpendicular to the front panel position 0 0 is indicated in the software When the PSV is controlled via the software LEDs REMOTE and LLO are lit up you can use the software to position the laser beam please refer to your software manual 5 Operating the PSV 5 9 Defining and Deleting Scan Points APS Hand set PSV Z 051 Note Defining and deleting individual scan points is only available if you have the software option APS Professional PSV Z 062 The hand set PSV Z 051 is connected to the circular jack REMOTE CONTROL on the front of the scanning head You can define and delete individual scan points using the clearly visible part of the hand set shown in figure 5 3 To do so proceed as follows 1 Switch on th
98. se up unit on the front of the scanning head using the two knurled screws Caution Pay attention to the correct fit of the precision pins and only hand tighten the knurled screws Dimensions Beam 94 i jE 80 T ll i 12 50 0 1385 o oo 240m 134 50 149 20 X M6 178 o ES M5 3x o 8 i o 207 50 5 5 g 213 50 1 2340 i Rs N oa 405 gt Y 170 A Optional Accessories for the Scanning Head OFV 056 150 50 Beam 511 97 90 CI axis for 33 81 88 31 y motion alee The connector requires approx 120 mm free space at the back panel of the scanning head Figure A 2 Views of the scanning head with close up unit mounted 120 x motion x motion A 3 A Optional Accessories for the Scanning Head OFV 056 A 1 2 Micro Scan Lenses OFV CL xxx By attaching the micro scan lenses scan fields down to 1mm x 1 2mm are achieved at a fixed stand off distance The specialty of the micro scan lenses is that the laser beam nearly perpendicular meets the measurement surface as also shown in figure A 3 for the OFV CL 150 Without loss of signal quality mirror like objects can be scanned up to a tilt of 4 Scanner mirrors Micro scan lense c Figure A 3 Function principle of the micro scan lenses
99. station 3 13 Index block diagram controller C 1 tracking filter circuit C 3 block filter for the close up unit A 1 broad band decoder C 4 C cabling controller 3 22 drive control for the test stand A 7 junction box 3 22 3 25 mains connection 3 27 pan tilt stage 3 27 scanning head 3 27 vertical test stand A 6 workstation 3 22 calibration accuracy specification 7 2 calibration controller 7 1 cavity length scanning head 7 7 CD ROM drive rewriter on the workstation 3 13 change in temperature 3 1 cleaning 3 1 CLEAR jack on the controller 3 4 key on the controller 3 4 close up lenses A 2 stand off distances scan fields A 2 close up unit assembly A 2 block filter A 1 micro scan lenses A 4 ring light for micro scan lenses A 5 specification A 1 vertical test stand A 5 coaxial unit close up lenses A 2 mounting holes 3 6 specification A 1 COM 1 interface on the workstation model F U 3 15 interface on the workstation model H 3 14 COM 2 interface on the workstation model F U 3 16 interface on the workstation model H 3 14 compatibility interfaces junction box 7 5 7 6 components of the PSV system 2 1 unpacking 3 2 computer technical specification 7 10 CONFIG menu in the controller 5 11 configuration optical in the scanning head B 2 connecting cables 3 1 connector ACQUISITION on the workstation model F U 3 16 on the workstation model H 3 14 Index connector AV on the works
100. t panels of the controller and the junction box Internal 11 PSV 300 H If required the signal of the internal function generator is function available at the BNC jacks OUT 1 and OUT2 on the front of the junction generator box for the model H and at the BNC jack OUTS of the generator cable PSV 300 F U If required the signal of the internal function generator is available at the BNC jack SIGNAL on the front of the junction box for the models F and U 3 24 3 First Steps 12 PSV 300 H If required the synchronized pulse of the generator signal is available at the BNC jack SYNC OUT on the front of the junction box PSV 300 F U If required the synchronized pulse of the generator signal is available at the BNC jack SYNC on the front of the junction box Acoustic 13 If applicable connect the optional acoustic gate unit PSV Z EQ to the gate unit BNC jack GATE IN on the front of the junction box Junction box 14 To control the video camera plug an RS 232 cable into the jack RS 232 workstation on the back of the junction box and into either of the jacks COM 1 or COM on the back of the workstation 15 Plug the Video cable into the BNC jack VIDEO on the back of the junction box and into the 9 pin Sub D jack AV on the back of the workstation Caution Plug in the SCSI type connectors with great care at the right angles so as not to damage them 16 PSV 300 H U Plug the Y shaped Acquisition cable into the
101. tation model F U 3 16 on the workstation model H 3 14 connector DAC on the workstation model F U 3 16 on the workstation model H 3 14 connector for the keyboard on the workstation model F U 3 15 on the workstation model H 3 14 connector for the mouse on the workstation model F U 3 15 on the workstation model H 3 14 connector GENERATOR on the workstation model H 3 14 connector INTERFEROMETER on the controller 3 5 connector MONITOR on the workstation model F U 3 16 on the workstation model H 3 14 connector PRINTER on the workstation model F U 3 16 on the workstation model H 3 14 connector to the network on the workstation model F U 3 15 on the workstation model H 3 14 connector USB port on the workstation model F U 3 15 on the workstation model H 3 14 connector for the pan tilt stage on the underside of the scanning head 3 6 control elements controller back panel 3 5 controller front panel 3 3 junction box back panel 3 11 junction box front panel model F U 3 9 junction box front panel model H 3 8 scanning head back panel 3 7 scanning head front panel 3 6 workstation back panel model F U 3 15 workstation back panel model H 3 13 workstation front panel 3 12 control keys for the pan tilt stage on the junction box model F U 3 9 on the junction box model H 3 8 controller adjusting settings 5 8 block diagram C 1 cabling 3 22 connector INTERFEROMETER 3 5 contro
102. tched on via a key switch on the controller The key can only be removed when the controller is switched off Itis not necessary to open the housing of the scanning head when using the PSV as intended Opening the housing will invalidate the warranty Please pay attention to the following safety precautions when using the PSV Never look directly into the laser beam with the naked eye or with the aid of mirrors or optical instruments Avoid staying in the scanning area The laser beam can exit the scanning head at an angle of 20 Only switch the mechanical beam shutter to the ON position when you are making measurements To position the scanning head switch the beam shutter to the OFF position Only when the head is roughly in place and has been fixed in a stable position switch the beam shutter to ON Do not use any reflective tools watches etc when you are working in the path of the laser beam 1 Safety Information 1 2 Laser Warning Labels 1 2 1 EC Countries The laser warning labels for the PSV in EC countries are shown in figure 1 1 Labels 2 and 3 are affixed in the language of the customer s country Their position on the scanning head is shown in figure 1 2 1 2 LASER RADIATION DO NOT STARE INTO BEAM CLASS 2 LASER PRODUCT ACCORDING TO EN 60825 1 P lt 1mW A 632 8 nm 3 CAUTION LASER RADIATION WHEN OPEN AVOID EXPOSURE TO BEAM Figure 1 1 Laser warning labels for the PSV in EC countries Figure 1 2
103. the scanning head are sensitive to moisture high temperature jolting and dirt A sufficient acclimatization period should be allowed for before switching the PSV on Avoid condensation on the optical components caused by a rapid change in temperature Before taking the PSV into operation please ensure that the supply voltage set with the voltage selectors of the controller and the workstation corresponds with the local mains voltage Only replace defective fuses by fuses of the same kind and equal rating The mains voltage input of the workstation can also be designed as a wide range input and therefore be connected to all mains voltages with nominal values between 100 V and 240V The scanning head must not be positioned provisionally but mounted properly on a stable tripod using the threads provided As a general rule the PSV must not be switched on until all cables have been connected Make sure that all jack connections are connected properly and firmly Plug in the SCSI type connectors of the acquisition cable with great care at the right angles Only use original RS 232 cables from Polytec for the RS 232 connections 1 1 wired Protect all cables from mechanical damage and from high temperatures The helium neon laser in the scanning head requires a certain period of time to reach optimum stability The PSV should thus be switched on 30 minutes before the first measurements are made to ensure that it is in thermal equilibrium with the
104. view of the workstation 1 Cooling fan Caution This opening must always be kept free to ensure sufficient cooling 2 POWER and HDD LED The green LED POWER lights up when the workstation is switched on using the mains switch on the back and when the black key on the front is pressed The red LED being lit indicates the activity of the hard disk drive HDD in the workstation 3 RESET key Using this key the control processor of the workstation can be reset and the workstation can be restarted The setting of the workstation is subsequently the same as it was straight after switching on You can press this key through the opening using a thin object 3 12 Back panel for model H 3 First Steps 3 5 disk drive CD ROM drive or rewriter You will find an exact description of the drive in the user manual of the manufacturer On Off key Pressing the black key the workstation will be switched on or off Lock with key in the front flap To secure the workstation for unauthorized using the front flap can be locked using the key The back panel of the workstation for the PSV model H is shown in figure 3 9 The order of the boards can be different from the picture GENERATOR PRINTER MONITOR Ol 0 Figure 3 9 Rear view of the workstation for the PSV model H Mains connection combination Mains socket with a

Polytec Scanning Vibrometer PSV 300

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