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CHR150 User Manual - RevD

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1. 150 Operating and maintenance manual STIL S A 595 rue Pierre Berthier Domaine de Saint Hilaire 13855 Aix en Provence cedex 3 France Tel 33 0 4 42 39 66 51 Fax 33 0 4 42 24 38 05 Email stil sa wanadoo fr Web site www stilsa com STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D CONTENTS 1 PRESENTATION OF THE RANGE OF CHR SENSORS 4 2 PRESENTATION OF THE CHR 150 suae aeta eo vacuae aseo eo 4 2 1 CONTROEBLER eere EA eren tbe en dens 4 2 2 OPTICAL PEN AND OPTICAL FIBER 5 3 T Wd of de 6 3 1 THERMAL HAZARDS eerie Pee ERO EEVEE Sons Deere as pe PER 6 3 2 ELECTRICAL HAZARDS eeu MG GNAEUS NITE 6 3 3 OPTICAI HAZARDS rne nibii mme RU 6 3 4 GENERAL RECOMMENDATIONS scssssssssssssssssssssssssssssssssvsssvsvecererecesecsessesssscessessessessssssseesseesseeserererenens 6 3 5 COMPLIANCE TO THE EC REGULATION 69 336 EEC ELECTROMAGNETIC COMPATIBILITY 6 4 INSTALLATION AND SWITCHING ON cscccccscssssssscssccccscsssssccscccsscsssscececcscssssssceecceccsscsscsececesessssees 7 5 COMMUNICATING WITH THE CHR 150 c cccsssssscccssssccssssscccsssccessssccssssccscssseccscssssccsssecccessseeces 8 6 GETTING STARTED TUTORIAL 1 ssicicsccccc
2. One point trigger Function Put the sensor on standby pending receipt of an external trigger signal Upon receipt of the trigger the sensor transmits a single point Control panel Not available Command TRE to activate the mode or CTN to deactivate the mode Parameter Value returned ready 8 9 Request Save the current configuration 8 9 1 Request the current configuration Status The Status command is used for interrogating the sensor on its current configuration in other words all the current configuration parameters Status Function Request the current configuration Control panel Move amongst the configuration s menus Any key F4 then 4 And note the value of all parameters Command STS String of characters SRAn1 MODn2 SENn3 ccc AVRn4 SODb0 b1 b7 ANAn5 n6 n7 n8 n9 n10 SCAn11 ready n1 is the index of the preset sampling rate String returned n2 is the index of the measuring mode n3 is the index of the calibration table ccc ASC or BIN according to the format of data transmission n4 is the averaging n5 is the data item directed to the first analog output 0 7 n6 is the value corresponding to OV for the first analog output n7 is the value corresponding to 10V for the first analog output n8 isthe data item directed to the second analog output 0 7 n9 is the value corresponding to OV for the second analog output n10 is t
3. Page 4 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D The rear panel of the controller features Optional optical fiber Socket for connecting optical pen 2 Analog output coaxial sockets Sync in amp Sync Coaxial sockets Cooling fan RS232 SUB D Extractable drawer 84 264 V 50 60 Hz mains 9 pin socket providing access to input socket the halogen lamp 2 2 Optical pen and optical fiber The optical pen is totally passive since it incorporates no heat sources or moving parts thus avoiding any thermal expansion which could affect the accuracy of the sensor When handling the optical fiber lead which links the optical pen to the controller take care to avoid bending the fiber to a radius of curvature of less than 20 mm When no optical fiber is connected the socket must at all times be fitted with its protection cap to avoid contamination of the fiber tip which could result in malfunctioning of the sensor Page 5 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 3 Safety The CHR 150 is an opto electronic instrument It is safe in normal operating conditions 3 1 Thermal Hazards The temperature of the Halogen lamp and its support is very high Be very careful when changing the halogen lamp in order to avoid the risk of a severe burn Switch the power off and let the instrument cool down for about 20 minutes before
4. Data item mode 0 mode1 Thickness Mode 3 Min max Distance 0 Distance Thicknes 1 noused Distance face 1 2 notused Distance face 2 3 Intnsty noted 4 notusd Intensity face 1 notused 5 notused Intensity face2 6 Barycenter Barycenter face 1 Barycenter face 2 data used by the manufacturer for calibrating the sensor face 1 is the front face nearest to the optical pen of the sample face 2 is the rear face B Data items for the Interferometric measuring mode Data item mode 2 Interferometric Thickness of the layer with the best quality level Thickness of the layer with the second best quality level Thickness of the layer with the worst quality level Quality level of the layer with the best quality level Quality level of the layer with the second best quality level Quality level of the layer with the worst quality level Intensity OO Not used data items 1 2 4 amp 5 are significant for transparent multi layer samples For single layer samples only data 0 3 and 6 are useful Example In Distance measuring mode for the sensor to transmit the values of the Distance and Quality at each measurement the following command must be sent SOD 1 0 0 1 0 0 0 0 Warning The transmission capacity is dependent on the sampling r
5. This chapter is a tutorial intended for users having acquired some initial experience with the CHR 150 sensor in the Distance measuring mode This tutorial covers the following topics e Thickness Confocal 2 surfaces measuring mode e Interferometric and Min max optional measuring modes e Communication with the sensor via the RS232 serial link using the Windows Hyper Terminal utility Synchronisation signals Trigger 7 1 Measuring modes The main measuring mode for the CHR 150 sensor is Distance mode The sensor is calibrated and tested by the manufacturer in this measuring mode and a certificate of the test results is supplied with each optical pen In order to measure the thickness of flat transparent or semi transparent samples the CHR provides two additional measuring modes Thickness available as standard and Interferometric mode available as an option In both these modes the refractive index of the sample must be known The last measuring mode Min max mode dedicated to on line measurement of the thickness of transparent objects is also available as an option This mode enables the measurement of the minimum and maximum thickness measured within a time window determined by the operator and comparison of these values with the thresholds established by the operator CHR sensor measuring modes Measuring mode Distance Thickness Min max Interfe
6. measuring mode When it is known that the Intensity of the signal is very low the detection threshold can be lowered in order to be able to detect very low peaks In the case of false detections measurement when no sample is present the detection threshold should be increased Detection Threshold Function Set request the peak detection threshold Control panel Press any key F4 then F2 until Set detect threshold Command THRn or THR Parameter Value returned n between 0 and 4096 Example THR35 Recommendation Do not adjust the detection threshold too high as this would reduce the sensor s measurement dynamics 10 2 Double frequency mode 10 2 1 Presentation This function is dedicated to the measurement of samples whose reflectivity is very heterogeneous For such samples if the sensor is configured to a low sampling rate the signal saturates at the sample points where the reflectivity is high if the sensor is configured at a high sampling rate the Intensity of the signal is insufficient at the points where the reflectivity is low In the double frequency mode the sensor permanently switches between 2 sampling rates In other words during each measurement cycle the sensor acquires the optical signal twice once with a long exposure time low sampling rate and again with a short exposure time high sampling rate The CHR processor then decides which of the 2 acquisitions
7. Distance Confocal 1 surface and select the 1st and 4 data items Distance and Intensity e the host PC quit any CHR application software to release the sensor serial port e n the Start menu of your PC select Programs then Accessories then Communication and launch the Windows Hyper Terminal utility Name your session then click on e n the Connect using field select the connected COM port e Inthe Port parameters window configure the link as follows baud rate bits per second 115200 data bits 8 parity none Stop bits 1 flux control none e Watch the data output on the PC screen 2 integers Distance and Intensity separated by a comma e Disconnect by clicking on the End icon open telephone Select the File Properties menu then in the window which opens the parameters tab Click on the ASCII configuration button In the ASCII Configuration window check the first and third boxes of the ASCII reception frame This will add lt LF gt after each CR received No box should be checked in the ASCII transmission frame Click twice on OK to return to the main window e Connect again by clicking on the Call icon closed telephone A blank line is inserted after each data line The utility is now ready for communication with the CHR e Using the PC s keyboard enter AVR30 then press Entry This command con
8. The CHR 150 refuses to switch to The dark signal is not valid for that low sampling rate sampling rate Acquire a valid dark signal watch for warning on the LCD display if necessary after cleaning the optical fiber tip The halogen lamp is fused Replace the lamp There is no light coming from the The 12V supply for the lamp is faulty Contact the manufacturer at after sale stilsa com optical pen The CHR 150 is displaying Lamp problem change adjust lamp The fibre optic lead is incorrectly connected to the unit Check the connection see photos 3 The optical fibre is broken Contact the manufacturer at after sale stilsa com The object is not within the measuring field of the optical pen Adjust the position of the object or of the pen The optical pen is not or is incorrectly connected Check the connection see photos 3 The sampling rate is too high for this type of object Reduce the sampling rate The CHR 150 will not measure display of 0 00 for Intensity and The detection threshold has been set Distance too high Lower the detection threshold The connection socket for the fibre optic lead is damaged Contact the manufacturer at after sale stilsa com Unknown reason Check that light is shining from the optical pen then Contact the manufacturer at after sale stilsa com The detection threshold is set too Incre
9. Min Thickness Threshold Min Thickness Threshold Function Set request the minimum authorised thickness threshold Control panel Not available Command MITn n 5 digit integer indicating min thickness between 0 and 32767 Parameter Value returned n min thickness 32767 optical pen measurement range x refractive index Example set the threshold at 600 um for an optical pen whose measurement range is mm 3000 and a refractive index of 1 5 n 600 x 32767 3000 x 1 5 4369 The command to send is MITO4369 10 4 2 Set request the higher limit for thethickness Max Thickness Threshold Max Thickness Threshold Function Set request the maximum authorised thickness threshold Control panel Not available Command MATn n 5 digit integer indicating max thickness between 0 and 32767 Parameter Value returned n max thickness x 32767 optical pen measurement range refractive index 10 4 3 Related Commands e To configure the sensor in Min max measuring mode use command MODS cf Mode To know the optical pen measurement range use command SCA cf Scale To select the data min thickness and max thickness use command SOD0 0 0 0 0 0 1 1 cf Select Output Data Page 40 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D 10 5 Ad
10. The CHR front panel displays real time measurements and the 4 keys keypad allows a direct and easy access to sensor configuration b The RS232 serial link enables sensor configuration using a specific control language as well as acquisition of the measured data For example the Windows Hyper Terminal utility or any other utility intended for controlling a serial link can be used to send the commands and receive the measurements back from the sensor c The CHR Monitor optional software is intended for configuring the sensor and launching measurements three operating modes continuous visualisation point by point measurement acquisition of a temporal profile It can also be used to display save and print out the measurements d The optional CHR DLL optional software is used to interface the sensor with a general purpose user program in language or similar The operating manual of the DLL includes a large number of code samples e Finally the CHR Setup optional software can be used for viewing the signal from the on board spectrometer and for downloading new firmware versions and new calibration tables These advanced features may be useful for some specific applications For further details regarding available software please visit our web site http www stilsa com Recommendation the software applications use the same COM port to communicate with the CHR 150 Remember to always free the
11. and for retrieving the measurement data The RS232 sub D at the CHR 150 controller back panel should be connected to a free COM Port on the host computer COM1 or COMO or on the device used for communicating with the sensor using direct non crossed serial link wire The baud rate of the CHR RS232 link should be matched to that of the host computer or the device used for communicating with the sensor Further in this chapter we use the term host computer to designate any device communicating with the sensor via the RS232 link 9 1 Configuration of the COM port of the host computer The host computer COM port should be configured as follows e Databits 8 e Parity None e Stop bit 1 e Flux control None e Transmission baud rate As high as possible up to 115200 bauds Matched to the sensor baud rate 9 2 Selection of the CHR baud rate This command adjusts the baud rate of the CHR RS232 link The factory setting is 115200 baud Baud Rate Function Adjust the CHR RS232 baud rate Control panel Press any key F4 then F2 F3 until serial port baud rate Command BAUn or BAU Parameter n 9600 or 19200 or 38400 or 57600 or 115200 Example BAU115200 9 3 Command syntax Every command transmitted to the sensor must start with Every command must end with a lt CRLF gt carriage return line feed sequence All letters must be higher case When a command has one or more paramet
12. attempting to open the lamp drawer 3 2 Electrical Hazards The CHR 150 controller box should be opened by qualified technicians only Electrical hazards might exist especially during an inappropriate intervention on the instrument Unplug the instrument from the power outlet before changing accessories maintenance cleaning or changing the halogen lamp 3 3 Optical Hazards The optical pen emits a beam of visible light with wavelengths ranging from 450 to 900 nm The flux contained in this beam is smaller than or equal to a value largely under the MPE Maximum Permissible Exposure Thus independently of the light path inside the room and its possible reflections this light beam cannot induce any burn to the skin nor to the eyes 3 4 General Recommendations Do not use the instrument if it has been dropped and shows signs of damage or functions improperly In this case do not open the instrument and contact our help line after sale stilsa com Repairs should only be carried by qualified technicians using original replacement parts In case of inappropriate use or failure to comply with the instructions the manufacturer disclaims all liability and the guarantee will not apply 3 5 Compliance to the EC regulation 89 336 EEC Electromagnetic Compatibility The CHH 150 sensor complies to the generic or specific requirements of the following harmonized standards e EN 50081 1 Spurious emission e EN 61000 6 2 Res
13. frequency option For the moment we wish to select the lowest rate 30Hz Use F2 several time to select this rate and validate with F1 or F4 Sensor configuration is done When quitting save the current configuration to the EEPROM 6 4 Recording the dark signal The dark signal of the sensor represents an intrinsic offset level generated by parasitic light in the sensor which must be taken into account for the sensor to be able to operate correctly The level of the Dark signal depends on the sampling rate The dark signal should be recorded at all measuring rates in order to be able to subtract it while the sensor is measuring A dark signal acquisition is performed during adjustment by the manufacturer but must be repeated at regular intervals in order to compensate for the halogen lamp ageing phenomenon In order to perform a dark signal acquisition it is essential for there to be nothing within the measurement field or even better to blank off the light beam by applying a piece of paper over the tip of the optical pen Press any key to access the main menu followed by F2 to enter the Dark menu Blank off the light with a piece of paper then press F4 to start dark acquisition The sensor then records the dark signal over a few seconds A message is displayed to indicate the end of this operation The piece of paper can now be removed and the sensor can be used in the normal way Warning If on completion of the dark recordin
14. method the sampling rate is defined by its index The second method is slightly more complicated but provides greater flexibility in the choice of sampling rate In this method the sampling rate is defined by its value in Hz The free rate for the CHR 150 is limited to 489 Hz This paragraph describes both methods followed by some examples 8 3 1 Set request a preset sampling rate Preset Rate The CHR 150 provides 4 preset sampling rates Index 3 4 5 6 Sampling rate 30 Hz 100Hz 300Hz 1000Hz The Preset Rate function is used to Set request the index of the sampling rate Preset Rate Function Set request the index of a preset sampling rate Control panel Press any key F3 then F2 Command SRAn or SRA Parameter Value returned n sampling rate index 3 6 Example 5 Page 23 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 8 3 2 Set request the free sampling rate Free Rate The Free Rate function is used to Set request the value in Hz attributed to the free sampling rate Before issuing the command the duty cycle parameter must be set at 100 cf example below in order to inhibit the double frequency mode The operator can specify any integer sampling rate between 30 Hz and 489 Hz The processor selects the nearest greater floating point value which is compatible w
15. 86b 200503 ready Recommendation Before contacting the supplier for after sales service use the VER command and record the response from the sensor Page 29 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 8 11 Lock or unlock access to keypad This command activates or deactivates the keyboard Locking the keyboard can be very useful when handling the CHR 150 with a machine Warning after switching the CHR OFF and ON again the keypad is automatically activated Lock Function Lock the keyboard to avoid undesirable inputs on the keys Control panel Not available Command LOCn Parameter Value returned 0 keypad unlock n 1 keypad locked Example LOC1 8 12 Restore the default settings This function restores the CHR 150 default configuration settings factory settings which may be necessary when configuration errors have been committed which affect the operation of the sensor Set Default Setting Function Return to factory settings Control panel Press any key F4 then F2 F3 until Set default parameters Command Not available Page 30 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 9 Control and acquisition of the data via the serial link The CHR 150 incorporates an RS232 serial link for controlling the sensor using a specific control language
16. Hz 1 data item For the list of data items available in each measuring mode see Selection of the data to be transmitted Page 35 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 9 7 Decoding of the data e Intensity is encoded over 12 bits 0 4095 To obtain the Intensity in of the dynamic response of the sensor use the following relation Intensity in 100 X Value transmitted 4095 e Distance is encoded over 15 bits 0 32767 To obtain the Distance in um use the following relation Distance Optical pen measurement range X Value transmitted 32767 e Position of the barycenter pixel index is encoded over 15 bits 0 32767 To obtain the position of the barycenter in pixels use the following relation Barycenter Value transmitted 32 520 e For Thickness measuring mode the thickness is encoded over 15 bits 0 32767 To obtain the thickness in use the following relation Thickness z transmitted value x Optical pen measurement range x refractive index 32767 e For the Min max measuring mode the min thickness and the max thickness are encoded over 15 bits 0 32767 To obtain the min max thickness in um use the same relation as in Thickness mode Min max thickness Transmitted value x optical pen measurement range x refractive index 32767 e For the Interferometric measuring mode the thicknes
17. Its distance from the optical pen should be approximately equal to the Working Measurement working distance of the pen distance range Optical pen For pens with a millimetric measurement range the positioning of the object within the measurement range of the optical pen is easy to achieve simply observe the luminous spot focused on the object by the optical pen as the measuring range is approached the spot becomes smaller and smaller and its intensity increases For optical pens with a micrometric measurement range the operation is more difficult position the sample on a stable support on a small manually translating bed with a suitable pitch lead screw As soon as the sample enters the optical pen s measurement field the Distance intensity measured are displayed on bar graphs and digital indicators on the LCD display Dist um 135 00 Recommendation If no measurement is displayed when the object is within the measuring field of the sensor check the following points The optical fiber cable connector is fully plugged into the socket on the front panel A light beam is emitted from the tip of the optical pen and the spot is focussed on the sample The distance between the tip of the optical pen and the surface of the sample is equal to the working distance specified in the table above The optical axis is normal to the surface of the sample The local slope must be less than the max slope indicated in the
18. e Senda command again then send the CTN may be used a software trigger in other words it may replace a hardware trigger signal to restart measurement e Quit the HyperTerminal utility to release the sensor serial port Note The sensor features a second trigger mode called one point trigger In this mode when triggered by the Sync in input the sensor transmits the data of a single sample point and stands by again At each additional trigger signal it transmits one more sample point until the one point trigger mode is desactivated cf Synchronization signals The second tutorial is over At this point you have a general idea of the principal features of the CHR 150 These features are described in a more rigourous way and with greater detail in the next chapters Page 21 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D 8 Main functions of the CHR 150 8 1 Optical pen selection The CHR 150 sensor may accept up to 6 calibration tables corresponding to 6 different optical pens 8 1 1 Optical pen selection Select confocal sensor The Select confocal sensor function is used to specify or to request the index of the calibration table corresponding to optical pen connected to the CHR Select confocal sensor Function Set request the index of the calibration table Control panel Press any key F4 then press F2 F3
19. is the best and calculates the data using that acquisition The decision is taken on the basis of the following information if the low sampling rate acquisition is saturated the sensor uses the high sampling rate acquisition Otherwise it uses the low sampling rate acquisition The configuration includes 2 steps First the cycle sampling rate must be set number of points measured per second using the Rate function SHZ Then the cyclic ratio percentage of integration time dedicated to high sampling rate using the Duty Cycle function SDCY Example One wishes to work at 2 sampling rates 1000 Hz and 250 Hz 1000 Hz corresponds to an exposure time of 1 ms 250 Hz corresponds to an exposure time of 4 ms The acquisition cycle lasts 1 4 5 ms of which 1 5 20 is dedicated to high sampling rate and 4 5 80 are dedicated to low sampling rate The rate for the cycle is 1 5 ms 200 Hz Page 37 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D To configure the sensor to these values using the Control panel e Reach the Cycle frequency by following this process Press any key Select S Rate then F4 Enter 200 using F2 F3 and F4 e Reach the settings of the E Time ratio by pressing F1 e Press F2 and until 80 20 is displayed To configure the sensor to the same values using commands enter the following commands via the seri
20. manual Doc ref CHR2 001 P2 Rev D 4 Unscrew the large screw at the top of the unit then remove the cover and the rear panel 5 Remove the defective lamp and replace it with a new one taking care not to touch it with bare fingers Ceramic ferrule 6 Adjust the position of the filament such that it is exactly opposite the face of the optical fiber which collects the light beam represented by a small white ceramic circle This precise positioning is essential to the Correct Incorrect correct operation of the sensor 7 Reinstall the light box performing the above operations in reverse order 8 Switch the apparatus back on and perform a new dark signal acquisition Page 46 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 13 Troubleshooting Symptom Possible cause Solution Dark signal acquisition was initiated while an object was within the The CHR 150 displays too much Measuring field Remove the object from the field or blank off the tip of the optical pen and try again light on CCD at S rate 30Hz The tip of the optic fibre is dirty and generating too much light noise Clean the optical fiber tip cf Maintenance Despite cleaning the fibres the The optical fibre is damaged and dark signal is still not valid at low must be replaced sampling rates Contact the manufacturer at after sale stilsa com
21. mode enter with F4 and select the Interferometric mode using F2 or then validate with F1 or F4 At that step enter the refractive index and press F1 This measuring mode is dedicated to thickness measurement of transparent coatings or transparent films whose thickness is within the range 2 to 100 um approximately for a refractive index of 1 5 3 to 150 um in air It requires the use of a specific achromatic optical pen and a signal processing algorithm specific to this mode In this measuring mode the sensor calculates an intensity value a quality indicator and a thickness actually it calculates 3 quality indicators for 3 theoretical possible thicknesses The second and third thicknesses are significant for multi layer samples only The Interferometric optical pen is equipped with a removable tip which enables it to work in contact with the object Its working distance is about 42 mm Tip Adjustment Procedure In order to ensure good quality measurements it is essential to comply with the following adjustment procedure e Connect up the Interferometric optical pen to the sensor Select the interferometric measuring mode Interfer thickness Acquire the Dark signal Approach the optical pen to the sample in order to obtain a non zero Intensity signal Adjust the distance by screwing the tip in or out in order to maximise the intensity measurement e According to the reflectivity of the
22. object being measured adjust the sampling rate in order to obtain maximum intensity without saturation Warning If the sensor saturates Intensity 10096 measurement becomes impossible e Finally adjust the distance by screwing the tip in or out in order to maximise the measurement quality parameter The optimum distance obtained by maximising the Quality parameter may be slightly different from that corresponding to maximum intensity When the adjustment is optimum tighten the locknut in order to lock the tip in that position The equipment is now ready to perform thickness measurement Measurement Take the sample to be measured and position the Interferometric optical pen equipped with its tip in contact with the point to be measured The optical pen must be positioned strictly perpendicular to the surface of the object In order to find the correct position slowly pivot the optical pen around the point looking for the maximum intensity value As soon as an available measurement is detected the Quality indicator and the Thickness value are displayed Bracketed mode In order to stabilise the measurements when the quality factor is low it is possible to bracket the thickness measuring range using the keypad Key F4 is pressed to switch successively between bracketed mode with black bases representing the excluded values and non bracketed mode It is also used for adjusting alternately the right hand or left hand limit
23. option Min max option Mode Function Set request the current measuring mode Control panel Press any key then F2 F3 until Select measuring mode Command setting MODn Parameter n Index of the measuring mode 0 3 Example MOD 1 Command interrogation MOD MOD n str Value returned n index of the mode str name of the mode Example MOD O confocal 1 surface ready 8 5 Set request the sample refractive index The sample refractive index is necessary in Thickness and Interferometric modes Refractive Index Function Set request the sample refractive index Control panel Press any key then F2 F3 until Refractive Index Command SRIx or Value returned x sample refractive index 3 decimal digits Example SRI1 512 8 6 Analog outputs configuration As shown in the back side of the device picture two analog outputs lay out of the CHR150 Both outputs are fully configurable by the operator Configuring an analog output consists in specifying the data item to be directed to it Distance Intensity and parameter values corresponding to Vmin and to Vmax respectively Recommendation The analog outputs provide sampled outputs Data acquisition via the analog links requires synchronisation between the CHR 150 and the acquisition device such as the PC acquisition board for example Synchronis
24. port by quitting one application before attempting to connect it to another application Page 8 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 6 Getting started Tutorial 1 This chapter is a tutorial intended for new users who wish to familiarise themselves with the main characteristics of the CHR 150 sensor For simplification purposes this tutorial only introduces one measuring mode Distance mode and one communication method the control panel We recommend that new users follow this tutorial even if they wish subsequently to use another measuring mode or a different method for communicating with the sensor 6 1 Using the control panel Press any key to access the control panel main menu LCD display S Rate 4 key Keypad F1 F2 F3 F4 As symbolised on the keypad each key has its own main function 1 Escape 2 Increase displayed value or move the cursor to the left Decrease displayed value or move the cursor to the right F4 Enter Besides each function displayed on the LCD display can be launched by the keys just bellow it As an example in the main menu shown above F1 may be used to clear the menu F2 to launch acquisition of the Dark signal to set sampling rate F4 to enter the configuration menu which allows setting all sensor parameters When configuration of the sensor is complete the sensor prompts the operator to sa
25. table The sampling rate selected is the lowest shown in the list 30 Hz the measuring mode selected is Confocal 1 surface mode The displacement pitch of the translation bed carrying the sample is suitable for the measurement for example for pen model 020 the pitch must be lt 5 um The Dark signal has been correctly acquired Page 13 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 6 6 Understanding the meaning of the intensity measurement The Intensity parameter measured by the sensor is an indication of the brightness of the signal reflected back off the sample as a percentage of the dynamic response of the sensor Its value is dependent on several parameters e The sampling rate of the sensor e The local slope on the sample angle between the optical axis and the normal to the surface at the point of impact e reflectivity of the sample at the detection wavelength A e The brightness of the halogen lamp at wavelength A e response of the spectrometer at wavelength The detection wavelength Ao varies within the measurement range Thus it is not surprising that the intensity measured at a given point on the sample varies when the latter is moved within the measurement range of the optical pen For each point in the measurement range the value of the intensity varies between 096 and a maximum value Isat Beyond that the sensor is saturated Th
26. until select confocal sensor Command SENn or SEN Parameter Value returned n index of the table between 0 and 5 Example SEN4 8 1 2 Full scale value of the optical pen currently selected Scale This function is used to obtain the measurement range of the optical pen currently selected Scale Function Request the measurement range of the current optical pen Control panel Press any key F4 then press F2 F3 until select confocal sensor the range is indicated to the right of the calibration table index Command SCA Parameter Value returned measurement range in microns 8 2 Acquiring the Dark signal The Function of the Dark signal is explained in the Getting started chapter This signal is dependent on the sampling rate it increases with the exposure time reciprocal of the sampling rate 8 2 1 Acquiring and saving the Dark signal Dark The Dark command records and saves of the dark signal in the EEPROM of the CHR 150 for all sampling rates in succession If the level of the dark signal is too high for low rates the CHR 150 returns the index of the lowest sampling rate which is usable see Set Sampling rate command When done the CHR returns to the last sampling rate before Dark acquisition Dark Function Acquire and save the dark signal Control panel Press any key F2 then F4 to validate Command DRK Value returned Index of th
27. 150 4 eene eee ee ee ee eese tene ee en oett to sese eene seen Pese eese esee eee 22 8 1 OPTICAL PEN SELECTION eee eee T 22 8 2 ACQUIRING THE DARK OONA nnne eene esee tarea asse esent tesa assess ener 22 8 3 SAMPLING RATE SELECTION eeeeetcte A E EEE OEE ER 23 8 4 MEASURING MODE SELECTION vee atv ees 25 8 5 SET REQUEST THE SAMPLE REFRACTIVE INDEX ssssscssccecsesssececececseneaeaecececeeseseseeeescsesessaeceeceeeeensaaes 25 8 6 ANALOG OUTPUTS CONFIGURATION eee eene nene nene ne ene ener enin nene erre renun 25 8 7 ANBRAGING iere Gee ueni hue Ui eie me ter eie 26 8 8 SYNCHRONISATION SIGNALES epiac Ge Mme ORENSE 27 8 9 REQUEST SAVE THE CURRENT CONFIGURATION cccsessscecececsesesnececececeesessaseceeececsesssaeceecesceensaaeeeeeceeeenes 28 8 10 READ THE VERSION OF THE ON BOARD SOFTWARE cccssecesesecececececececececscecececececececececececececeseceesceseceess 29 8 11 LOCK OR UNLOCK ACCESS TO KEYPAD cccccccesecececececececececececececececececscsesesesescseececeeececececesecececececeeseeeecess 30 8 12 RESTORE THE DEFAULT SETTINGS ever aede eroe ee Veo Perseo ee e 30 9 CONTROL AND ACQUISITION OF THE DATA VIA THE SERIAL LINK e ee ecce enne 31 9 1 CONFIGURATION OF THE COM PORT OF
28. 3 Functions related with the Interferometric measuring mode To understand the Interferometric measuring mode cf Going further chapter 10 3 1 Adjusting the quality threshold In Interferometric mode a quality level criterion is associated with each thickness measurement the higher this level the more accurate and reliable the measurement It is possible to use the Set Q threshold menu to adjust the minimum quality level beneath which any measurements will be ignored Quality Threshold Function Set the quality threshold in Interferometric mode Control panel Press F1 then F4 then F2 F3 until Set quality threshold Command QTHn Parameter Value returned n quality threshold 0 99 10 3 2 Activate deactivate the Bracketed mode Bracketed Mode Function Activate deactivate the left or right detection limit Control panel Press F4 Command LMAb LMA Parameter Value returned b 0 to de activate n 1 to activate 10 3 3 Adjusting the left limit of the detection window Left Detection Limit Left Detection Limit Function Adjust the left limit of the detection window in Bracketed mode Control panel Press F2 or F3 when the left detection limit is activated Command LLMn LLM Parameter Naluetret rned n left limit integer between 0 and 32767 The value 32767 corresponds to the measuring range 10 3 4 Adjust
29. 4 15 16 17 18 19 20 21 22 23 24 X X X X X X X X X X DSep Distance face 1 B DSep Distance face 2 B 25 26 27 28 29 30 31 32 33 34 35 36 X digit 0 9 DSep Data separator comma PSep Point separator CRLF 9 5 2 The Binary format Binary Function Configure the sensor for binary transmission format Press any key F4 then F2 F3 until Serial data ASCII BIN press F4 and use F2 F3 to choose Binary Command BIN Parameter Value returned Ready Control Panel In Binary format 2 bytes are transmitted for each data item with no data separator Successive points are separated by two consecutive bytes OxFF decimal value 255 Example Measuring mode Distance Selected data Distance and Intensity A B C Successive measurement points The table below shows the first 12 bytes transmitted Binary transmission format OxFF OxFF MSB LSB MSB LSB OxFF OxFF MSB LSB MSB LSB PSep Dist A Int A PSep Dist B Int B 1 2 3 4 5 6 7 8 9 10 11 12 Most Significant Byte LSB Least Significant Byte PSep Point separator Recommendation for software developers The MSB for an item of data can never be OxFF because all the data are encoded either over 12 bits or over 15 bits cf decoding of data Thus if 3 successive OxFF bytes appear in the flux of data the first OXFF is necessarily the LSB for the data of a meas
30. 6 Status cat eatin elie ened 28 Syncn Sync QUI iet dotted etit 5 T etes 16 Threshold Shas 19 40 TPIS SOR bois Rete ee ie Oey eat 15 27 MUERE ER 21 U Unlock the keypad 30 W White reference 41 Page 49 of 49
31. LAY CONTRAST ccccccccccccccccccceseccscseceseseseseseseseseuceusaueusesesuseesessessseseeeass 41 10 6 ACQUISITION OF THE WHITE REFERENCE SIGNAL eene 41 11 COMMANDS SUMMARY 42 12 MAINTENANCE sorsero 44 12 1 HANDEING THE 5 eerte reete reete terere ce err e c 44 SC DEEANING 2 estet eni ace ei niece S et 44 12 3 REPLACEMENT OF THE HALOGEN 45 13 TROUBLESHOOTING ro de Veo Uo denne oses AUR Rep Fo o vo p SOS aui Un o ee eaa UU 47 TROUBLE SHOOTING CONT see ea peso ee enne Eo se oae EE Ce EE eR ea EE Ue poa 48 Page 3 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 1 Presentation of the range of CHR sensors Based on the innovative optical principle of chromatic confocal imagery STIL patent the range of CHR sensors constitutes a new generation of high resolution non contact dimensional sensors for microtopography shape and texture analysis roughness measurement reverse engineering and many other metrological applications These modular compact and sturdy sensors are capable of operating both in indu
32. THE HOST COMPUTER eeeeee eene 31 9 2 SELECTION OF THE CHR BAUD RATE eeeeeee ee e e e emennn nnnm nnns ese ese esi ise ess e ese esse sse ese esee ases esses 31 9 3 COMMAND tete tete sette esee eee enn 31 9 4 SELECTION OF THE DATA BE TRANSMITTED eeeeetetee e e e emen emen nnnnesns es nses esi ese ess ese etes ese esas es ee 32 9 5 DATA TRANSMISSION rh nn enhn enini nene ne Ee nine nnne 33 Page 2 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D 9 6 LIMITATION OF THE AMOUNT OF DATA TRANSMISSIBLE SIMULTANEOUSLY eeeeer 35 9 7 DECODING OF THE DATA Nue EN Ee blouses eite 36 10 ADVANCED FUNCTIONS p vase eet ea be ea Vo seo E pepe evo va lees Prot oe Du re Pe e EN ERE pU 37 10 1 DETECTION THRESHOLD eee e eme emememennnnm nnnm nne etes ttt ttt e ese E E E E ese ess e sess ese sse ese esas e sese 37 10 2 DOUBLE FREQUENCY 5 MODE sese sese eset ese essais nun 37 10 3 FUNCTIONS RELATED WITH THE INTERFEROMETRIC 5 MEASURING 39 10 4 FUNCTIONS ASSOCIATED WITH MIN MAX 5 MODE eceeete eee nnn nnn nn n nnn annua 40 10 5 ADJUSTMENT OF THE LCD DISP
33. al link e SHZ200 this configures the cycle sampling rate to 200 Hz e DCY20 this configures the integration time for the high sampling rate at 20 of the cycle 10 2 2 Limitations The cycle sampling rate must be between 30 Hz and 489 Hz The cyclic ratio must be between 196 and 49 Note In practice the processor adjusts the precise value of the cycle sampling rate to the closest value which complies with certain internal limitations the integration time for each acquisition must be an integer multiple of a basic interval of around 50 us To obtain the precise sampling rates enter the commands SHZ and DCY The sensor returns the precise values as floating point number 10 2 3 Set request the cycle sampling rate Rate Rate Function Set request the cycle sampling rate in Hz Control panel Press any key F3 then F4 Command SHZn or SHZ Parameter Value returned n Cycle sampling rate in Hz 3 digit integer between 030 and 489 Example SHZ200 10 2 4 Set request the cyclic ratio Duty Cycle Duty Cycle Function Set request the cyclic ratio corresponding to the high sampling rate Control panel Press any key F3 F4 then F1 Command DCYn or DCY Parameter Value returned n 2 digit cyclic ratio integer between 1 and 49 Example DCY13 Page 38 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D 10
34. ase the detection threshold and repeat the low dark signal acquisition The CHR 150 sends erratic measurements even when there is no object within the measuring The dark signal acquisition is Repeat the dark signal acquisition field incorrect The Intensity display flashes on 99 The CCD photosensor is saturated while the object is within the measuring field Increase the sampling rate Page 47 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D Trouble shooting cont The sensor will not send any data via the serial link The CHR 150 has received a character and is awaiting a command Send the rest of the command or CTN to restart the flow of data without changing the configuration The sensor is awaiting a sync signal at the Trigger in input the LCD display is showing Waiting for trigger on Sync in Activate the sync signal or send command CTN via the serial link to exit from trigger standby The operator has programmed the CHR 150 to transmit no data Re activate data transmission by sending command SOD or via the configuration menu Impossible to dialogue with the CHR 150 via the serial link Error on the COM port number used Open dialog to the correct COM port The CHR 150 and the COM port on the PC are not set on the same baud rate Adjust the transmission rate it is recommended to adjust the rat
35. ata SOD1 0 0 1 0 0 0 0 lt CRLF gt SOD1 0 0 1 0 0 0 0 CR ready lt CRLF gt setting Select Output Data SOD lt CRLF gt SOD1 0 0 1 0 0 0 0 ready lt CRLF gt interrogation Version VER lt CRLF gt VER 288 C V2 35 280282 DSPsoft interrogation V0 86b 200503 ready lt CRLF gt Set Ascii Mode ASC lt CRLF gt ASC ready lt CRLF gt setting 9 4 Selection of the data to be transmitted As seen in the Measuring modes chapter the sensor measures several data in parallel at each point of the sample As an example in Distance measuring mode the data available are Distance Intensity and Barycenter The Set Digital Output Data command enables the user to determine for each individual data item if it is to be transmitted over the serial link or not Set Digital Output Data Function Set request which data is to be transmitted via the serial link Control Panel Press any key F4 then F2 F3 until set serial output data Command 500 bO b1 b2 b3 b4 b5 b6 b7 or SOD bi 1 if data item is transmitted or 0 data item is not transmitted Parameter Value returned i 0 7 index of the data item The two tables below show the meaning of the 8 data in the 4 measuring modes Page 32 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D A Data items for the Distance Thickness and Min max measuring modes
36. ate and the data format see further in this chapter Before sending command SOD check that the number of data items selected is compatible with these parameters 9 5 Data transmission formats The sensor provides 2 data transmission formats the ASCII format which is easier to use and the binary format which is more compact and allows higher transmission rates 9 5 1 The Ascii format Ascii ASCII Function Configure the sensor for ASCII transmission format Press any key F4 then F2 F3 until Serial data ASCII BIN press F4 and use F2 F3 to choose ASCII Command ASC Parameter Value returned Ready Control Panel Page 33 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D In ASCII format 5 characters digits are transmitted for each data item The data from the same point are separated by a comma and the successive points are separated by a CRLF string Example Measuring mode Thickness Data selected Thickness Distance face 1 Distance face 2 The successive measurement points are identified A B C etc The table below shows the first 36 characters transmitted ASCII transmission format X X X X X i X X X X X Thickness A DSep Distance face 1 A DSep 1 2 3 4 5 6 7 8 9 10 11 12 X X X X X CR LF X X X X X Distance face 2 A PSep Thickness B 13 1
37. ation is achieved using the Sync out output on the CHR 150 TTL clock signal at the sensor sampling rate The analog values must be latched to the rising front of the Sync out signal Page 25 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D Analog output Function Set request the maximum authorised thickness threshold Press any key F4 then F2 F3 until Config analog out 1 Control panel Or Config analog out 2 Command setting ANAn Xi p q n Analog output index 0 or 1 Xi index of the data item to be directed to the Analog output p param value corresponding to Vmin OV paramere q param value corresponding to Vmax 10V if Xi corresponds to Distance or Thickness 0 lt p lt q lt 32767 if Xi corresponds to Intensity or Quality 0 lt p q lt 4095 Example 1 0 32767 Command interrogation ANA ANAn0 p0 q0 n1 p1 q1 nO is the data item directed to the first analog output 0 7 pO is the value corresponding to OV for the first analog output 40 is the value corresponding to 10V for the first analog output ni is the data item directed to the second analog output 0 7 p1 is the value corresponding to OV for the second analog output q1 is the value corresponding to 10V for the second analog output Value returned Example ANA 0 0 20000 3 0 4095 ready 8 7 Averaging The averaging of the measurement
38. e lowest sampling rate usable Page 22 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 8 2 2 Fast Dark The Fast Dark function only refreshes the dark signal for the current acquisition frequency without saving the recording in the EEPROM If the dark signal measured is too high the CHR150 returns a not valid lt CRLF gt string and the previous dark signal continues in use This command has two optional arguments n is an integer indicating the number of successive acquisitions to be averaged in order to obtain the reference dark default value 50 m default value 32767 indicates the influence of the acquisitions made on the new reference dark according to the formula New Dark 1 32767 x m x Average acquisition 32767 m x Old Dark Fast Dark Function Acquire the Dark signal for the current sampling rate only without saving in the sensor memory Control panel Not available Command FDK or FDKn m n averaging factor for Dark 1 99 Parameter Value returned m weighting factor 1 32767 return Ready or Not valid 8 3 Sampling rate selection The sampling rate of the sensor may be managed by 2 methods e Selection of a preset sampling rate from a list e Definition of a specific sampling rate Free rate The first method which is simple and easy to use is recommended for most applications In this
39. e state of saturation is indicated by an intensity value of 10096 as shown in the graph below Intensitv measured bv the CHR 150 100 pm 1 2 0 2 7 0 Reflectivitv of the sample 10095 The value of Isat is dependent on the detection wavelength and may vary slowly within the measurement range of the sensor Example If the intensity measured oscillates between 100 to 60 this means that lsa 60 and that the sensor is on its saturation limit in such case select a higher rate Recommendation The intensity is a good indicator of the measurement quality It should be as high as possible without however reaching saturation level 6 7 Adjusting the sampling rate When the sample is within the measurement range of the optical pen adjust the sampling rate Modify the sampling rate selected in the CCD SCAN Rate window of the control panel and observe the value of the intensity displayed Recommendation Always select the lowest rate for which the signal does not saturate The first tutorial is over In this tutorial you have learned how to Use the control panel to configure the sensor Select the rate and the optical pen Record the Dark signal Position the sample with the measuring range of the optical pen Use the Intensity data to adjust the measuring range Page 14 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 7 Going further Tutorial 2
40. e to115200 bauds on both units The connecting cable is not suitable Use an RS232 lead with Rx and Tx wires pins 2 and 3 not crossed The display does not light up when the On Off switch is operated The apparatus is not connected to the mains Connect the CHR 150 unit to the mains Electronic fault Contact the manufacturer at after sale stilsa com The measurements displayed are not consistent with the actual dimensions of the object The type of optical pen programmed does not correspond to the optical pen physically connected to the unit Select the correct optical pen either via the keypad or via the serial link command SEN The thickness measured does not correspond to the expected value The refractive index has been incorrectly set Adjust the value of the refractive index either via the menu or by command SRI The configuration changes are lost each time the CHR unit is switched back on The configuration changes have not been saved Reply Yes to the question Save settings to EEPROM before leaving the configuration menu or Send command SSU before switching off the CHR 150 unit Page 48 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D INDEX A Analog outputs 25 Asci format 33 26 B Baud Rate ectetuer 31 Bi
41. erator has to select the calibration table corresponding to the optical pen that is physically connected To configure the controller to right optical pen using the control panel Press any key to access the Main menu Press F4 to enter the Configuration menu Press F2 until you reach the select confocal sensor window if you reach the last menu option change the sense and press F3 until you reach this window Press F4 to enter the select confocal sensor Use F2 F3 to select the desired optical pen Validate with F4 or F1 6 3 configuring of the sensor in Distance measuring mode The next step is to configure the sensor to the desired measuring mode For distance measurement select the Distance mode confocal 1 surface In the configuration menu press F2 or F3 until you reach the select measuring mode window Check that confocal 1 surface is displayed then validate with F1 or F4 Otherwise press F2 or F3 until you see confocal 1 surface displayed Next check that the averaging factor is set to 1 no averaging in the data averaging window The pel step in sensor configuration is setting sampling rate To select the S Rate menu exit the configuration menu using the F1 key In the Main menu select 5 Rate The currently selected rate is displayed CCD SCAN rate XXXX Hz Use F2 and to view the available rates and note the existence of the free double
42. ers the parameters come after the name of the command There should be no comma between the name of the command and the first parameter When a command includes several parameters the parameters are separated by commas For interrogation the parameter is replaced by a Page 31 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D On receipt of character the sensor stops sending data and returns an echo of the command characters including When the CHR 150 receives a complete command and has completed the corresponding actions it returns the string ready lt CRLF gt and switches back to normal operation Note if the command includes one or more parameter the sensor echoes the CR character as well see examples bellow Warning The command External Trigger TRG operates differently Refer to the corresponding paragraph for further details The table below shows some examples of commands and the correcsponding sensor responses Function Command Response Optical Pen SEN lt CRLF gt SEN 1ready lt eCRLF gt interrogation Acquire Dark Signal DRK lt CRLF gt DRK lt CRLF gt Measuring Mode MOD1 lt CRLF gt MOD1 lt CR gt ready lt CRLF gt setting Optical pen SENO lt CRLF gt SENO lt CR gt ready lt CRLF gt setting Measuring Mode MOD MOD 0 confocal 1 surface ready lt CRLF gt interrogation Select Output D
43. figures the averaging factor at 30 Data output is about 3 times faster as averaging changed from 99 to 30 e Enter AVR then press Entry to interrogate the sensor on the averaging value Observe the response from the sensor AVR 30 ready on the screen of the PC e Enter MOD then press Entry to interrogate the sensor on the current measuring mode Observe the response e Enter SCA then press Entry to interrogate the sensor on the measurement range of the current optical pen Observe the response e Enter SRA then press Entry to interrogate the sensor on the current sampling rate Observe the response e Disconnect and quit the HyperTerminal utility to release the serial port Page 20 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D The various commands of the CHR are described later in this manual and the communication with the sensor via the RS232 link is described in the Control and acquisition of data via the serial link chapter 7 6 Using the Trigger mode The CHR 150 includes 2 coaxial sockets see photo in Presentation of the CHR 150 for input and output synchronisation signals TTL 0 5V The Sync out signal is a TTL signal at the sampling rate which is permanently available and which does not require any special configuration The Sync in signal is used to synchronise the CHR 150 sensor with external events s
44. g sequence a warning message appears indicating that there is too much light for a given sampling rate this means that the dark signal is too high for working at lower rates This is generally caused by the presence of dust or impurities at the ends of the optical fiber generating stray light reflections which interfere with correct operation of the sensor Page 12 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D Clean the ends of the optical fiber as described in the maintenance section of this manual then repeat the dark signal acquisition and check that the warning message does not reappear A different cause for such a warning may be that the optical pen lens was not entirely blanked off Recommendation The dark signal acquisition procedure should preferably be performed at least a quarter of an hour after switching on the sensor in order to ensure that the temperature and the optical characteristics of the halogen lamp have stabilised 6 5 Positioning the sample within the measurement range of the optical pen Mount the optical pen on a suitable support for example a V block Position the sample to be measured in front of the pen and move it forward or backward until the working distance is reached Optical axis The zone of the sample to be measured must be located in front of the optical O pen within the measurement range of the pen
45. he value corresponding to 10V for the second analog output bO b7 0 or 1 determine whether or not data 0 to 7 are transmitted n11 is the scale in um Page 28 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D 8 9 2 Save the current configuration Save Setup The Save setup function is used to save the current configuration of the CHR 150 sensor on the sensor EEPROM This is essential for the sensor to be able to retrieve the configuration when it is next switched on If this is not done the next time the CHR 150 is switched on the sensor will lose all the latest modifications made Save Setup Function Save the current configuration in the sensor EEPROM After having escaped from the configuration menu you ll be asked to Press F4 to save the configuration on the EEPROM Command SSU Parameter Value returned ready Control panel Recommendation Use the Save Setup command to avoid the sensor losing the configuration when the equipment is switched off 8 10 Read the version of the on board software Version Function Request the version of the on board software Control panel Displayed few seconds when switching the CHR 150 on Command VER Parameter alte String of characters defining the version of the various components of the returned on board software for example 288 C V2 35 280282 DSPsoft V0
46. iecsscccesssonsteavesessisssnosctesecsessassessseecesssssessscbedesessccseeesscsestencesss 9 6 1 USING THE CONTROL PANEL 5 9 6 2 SELECTING THE OPTICAL news an Baa Sah ea eoe ee Ed 12 6 3 CONFIGURING OF THE SENSOR IN DISTANCE MEASURING 12 6 4 RECORDING THE DARK SIGNAL fecit tese tres eere eee eterbeekes tete esee 12 6 5 POSITIONING THE SAMPLE WITHIN THE MEASUREMENT RANGE OF THE OPTICAL 13 6 6 UNDERSTANDING THE MEANING OF THE INTENSITY eee nnn 14 6 7 ADJUSTING THE SAMPLING RATE eere eene nnn rrr ttt e t e e ete rettet testen renean 14 7 GOING FURTHER TUTORTAL 2 15 7 1 MEASURING MODES eese 15 7 2 CONFIGURING THE SENSOR IN THICKNESS MEASURING 16 7 3 CONFIGURING THE SENSOR IN INTERFEROMETRIC 5 MEASURING MODBE eceeeeeeeee nene 17 7 4 CONFIGURING THE SENSOR IN MIN MAX MEASURING MODE eeeen 18 7 5 COMMUNICATING WITH THE CHR 150 VIA THE RS232 LINK eeeeeeeeeeeeeee 20 7 6 USING THE TRIGGER MODE s0ssssssssssssssssssssssssssssssssssscesesessscsesssscssessssssssssssssssssssssssssssssssssssssseees 21 8 MAIN FUNCTIONS OF THE CHR
47. ing the right limit of the detection window Right Detection Limit Right Detection Limit Function Adjust the right limit of the detection window in Bracketed mode Control panel Press F2 or F3 when the right detection limit is activated Command RLMn RLM n right limit integer between 0 and 32767 The value 32767 corresponds to to the measuring range Supposing that the thickness of the sample is known to be between 5 and 9 um and that the range is 215 y Configure the left limit to value 32767 x 5 215 762 and the right limit to value 32767 x 9 215 1372 Page 39 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 10 3 5 Related commands e configure the sensor to Interferometric mode use command MOD2 cf Mode e To select the Thickness 1 Quality 1 and Intensity data use command S0OD1 0 0 1 0 0 1 0 cf Select Output Data e adjust the display hold time for the measurement which has just been made use directly the keypad Access the menu by pressing F4 adjust the display hold time by pressing keys F2 and the hold time can be adjusted to within 0 5 seconds then exit from the menu by pressing F1 or F4 10 4 Functions associated with Min max mode To understand the Min max mode cf Going further 10 4 1 Set request the lower limit for the thickness
48. irrespective of the sampling rate Note The emission of Sync out signals stops and restarts together with data transmission It is possible to deactivate the trigger in other words to restart acquisition without a rising front at the SUB D connector via command Start trigger Function Put the sensor on standby pending receipt of an external trigger signal Upon receipt of the trigger the sensor starts measuring at the programmed sampling rate Control panel Not available Command TRG to activate the mode to deactivate the mode Parameter Value returned ready Note the Sync in socket should be connected to an external signal source Page 27 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 8 8 2 One point trigger standby One point Trigger The One point Trigger function is similar to the Start trigger function with the following difference when the Sync in signal is received the sensor transmits the data of a single measured point and stops immediately Each successive Sync in signal triggers the transmission of a single point until the trigger mode is deactivated Note For each transmitted point the sensor emits one Sync out signal It is possible to deactivate the trigger in other words to restart acquisition without a rising front at the SUB D connector via 6CTN command
49. is located outside the measurement range Recommendation In Thickness mode center the sample within the measurement range of the pen avoid having either one of the faces close to the limits of the range The thickness of the sample must be compatible with the thickness measurement range of the optical pen used As a general rule the maximum thickness which can be measured is proportional to the refractive index of the material Thus for an OP1000 optical pen whose measurement range in air is 1 mm one can measure the thickness of a sheet of glass up to 1 5 mm If the thickness of the sample is less than the Minimum thickness limit specified the sensor is unable to resolve the two signals reflected from the two faces of the sample and considers them as a single signal Output will be set on zero Experimentation e To select the Thickness measuring mode press any key then F4 Next use F2 and to display Select measuring mode enter with F4 and select the Thickness mode Confocal 2 surfaces using F2 or then validate with F1 or F4 The LCD Screen displays refractive Index enter the value of the refractive index of the sample then click on OK to close the configuration window Warning To obtain a valid measurement in Thickness mode the refractive index of the sample must be accurately known e Position a thickness sample in the measurement range of the optical pen s
50. istance to disturbance Page 6 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 4 Installation and switching on Connect the controller to a mains socket with an earth connection then connect the optical fiber lead from the optical pen to the controller taking care to comply with the correct orientation of the connector Connection and disconnection of the optical fiber lead To connect the optical fiber lead simply insert the plug into the socket as shown in figure 1 until a Click is heard as it locks into position To remove the optical fiber from its socket first press on the locking lever then pull the connector out of the socket Warning When no optical fiber is connected the socket must at all times be fitted with its protection cap to avoid contamination of the fiber tip which could result in malfunctioning of the sensor Switch on the unit by operating the On Off switch When the unit is switched on and after a brief initialisation sequence the sensor displays the following screen The intensity and distance values are both displayed as zero so long as no object is present in the measuring field of the sensor Dist um 0 00 Page 7 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 5 Communicating with the CHR 150 There exist 5 alternative methods for communicating with the CHR 150 sensor a
51. itch from the Closed state to the Open state cf Signal specifications Ensure that the input is Open e Configure the sensor for Min max measuring mode e Adjust the thickness thresholds to E0 0 5 and E1 1 5 respectively e Select the Min thickness and Max thickness data for the bargraphs of the Sensors window C Use the Defect output e Stop the measurement e Connect the Sync out plug Defect output signal to an ohmmeter cf Signal specifications Start the measurement e Move the sample horizontally and observe the ohmmeter the resistance measured should be infinite e Stop the measurement Page 19 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D e Modify the thickness thresholds to E0 0 8 E1 0 2 and E0 0 2 E1 0 8 respectively Start the measurement Move the sample horizontally observe the triggering of the defect signal on the ohmmeter 7 5 Communicating with the CHR 150 via the RS232 link Connect the RS232 sub D at the CHR 150 controller to a free COM Port on your PC COM 1 or COMO using direct non crossed serial link wire e From the CHR 150 control panel enter the Configuration menu and verify that the baud rate is set at 115200 baud Set transmission format serial data menu at ASCII and the data averaging at 99 to reduce the data transmission rate Next set measuring mode to
52. ith its internal constraints the integration time must be a multiple of a basic cycle close to 50 us To know the exact value the sensor can be interrogated immediately after transmitting the command see the example below Rate Function Set request the value in Hz attributed to the free frequency Control panel mode Any key several time until Free Double Exposure is displayed then F4 to choose the rate and F1 to display the Set E Time ratio Command DCY100 followed by SHZn or SHZ Parameter Value returned n value of the free sampling rate in Hz between 30 and 489 8 3 3 Example In the following dialog the operator alternates Preset rate and Rate commands some of them with a wrong parameter value and interrogates the sensor to view the results of each command Read this dialog carefully and make sure you understand the response of the sensor in each case Command Comment Response from the sensor SRA4 Specifies the preset sampling rate of index 4 100 Hz SRA 4 100 Hz ready SRA Interrogates the sensor for the index of the current SRA4 100 Hz ready preset sampling rate SRA1 Specifies the preset sampling rate of index 1 Not valid ready unauthorised value authorized values are 3 6 SRA In case of wrong parameter the previous value is SRA 4 100 Hz ready maintained DCY100 Sets the cyclic ra
53. justment of the LCD display contrast LCD contrast It is possible to adjust the contrast level of the display via the LCD contrast sub menu Use the up and down arrow keys to adjust the level then exit the sub menu by pressing the ESC key 10 6 Acquisition of the white reference signal Take white reference Important This adjustment is made at factory and does not need to be repeated Access to this function is protected by a password which may be provided by a STIL after sales technician if it is found necessary to repeat the white reference signal acquisition Page 41 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 11 Commands Summary Commands E ud Designation Parameters See command description SANAT is 1 Set analog out setting parameters are different than i response parameters ASC 2 ASCII uod 1 Data Averaging n averaging factor 1 999 c 1 Posee n averaging factor 1 999 BAUn 2 Baud rate n baud rate 9600 to 115200 BIN 2 Binary CTN 1 Continue n cyclic ratio epee 4 Duty Cycle for double frequency 0 49 i for free rate n 100 DRK 1 aS n dark averaging factor 1 99 SFDKAM weighting factor 1 32767 5 Left Detection n window left limit 0 32767 5 Bracketed Mode b 0 or 1 Lock Unlock 0 or 1 PEOR keyboard access n 0 for unloc
54. ked cae 6 Max Thickness max thickness threshold 0 32767 SMS 6 Min Thickness n min thickness threshold 0 32767 MODn n index of the mode MOD 1 Measuring Mode ne mode index is followed by mode name eau 5 Quality Threshold quality threshold 0 999 mE 5 SN n window right limit 0 32767 Scale A SCA 1 for response n measuring range in um 1 dr s di n calibration table index 0 5 AF 1 4 Rate Mex rate or cycle sampling rate 2 ee bi 0 or 1 transmission of data i 1 Sampling Rate n presetrate index 3 6 Set Refractive m 1 Index x refractive index e g 1 512 SSU 1 Save Setup Page 42 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D Command summary cont Commands Category Designation Parameters SST 1 Status Cf command description THRn _ THR 3 Detection Threshold n detection threshold 0 4095 TREb 1 One point trigger pen TRG 1 Start Trigger VER 1 Version g Categories of functions on the above Commands table Category Function Chapter 1 General Main functions of the CHR 150 2 Serial link Control and data acquisition via the serial link 3 Detection threshold Advanced functions 4 Double frequency mode Advanced functions 5 Interferometric measuring mode Advanced functions 6 Min max measuring m
55. nary format 34 Calibration table sene 22 CHR MoOnltOr 8 CHR Set rera iD ORE EORR 8 Comimands eite eR ers 42 Contrast iet eed eed nets 41 Control panel cate Re che rese 9 iem Cures 38 D Dark signal mette 12 22 Decoding eene ines 36 Default Setting 30 Double frequency 37 D ty cycle aeos eterne etim ees 38 E EEPROM 9 29 External Trigger 32 F Fast dark tees 23 Free Rate ocn re ee 24 H Halogen lamp ete eee 45 Hyper Terminal 8 20 I Interferometric ssiri 17 33 39 K 2 tee ipd 9 L ECDzZz esee ipu 41 Lock the keypad eee 30 M Max Thickness ees 40 Measuring modes 15 etcetera ete ee eter 9 40 Mode eiie e 25 MPE Maximum Permissible Exposure 6 Optical inrer eee ette 44 Optical pen eee tete retentus 22 Outp ts eee 32 Q Quality indicator 17 Quality threshold esses 39 R Rate M H 38 RS232 amp 21 5 Sampling rate oireeni 23 38 SAV tiie lel epee 9 29 SENSOR DE 22 Serial lnk iiie eer iter 31 standards 2 5 454hc eR eae easel SRS
56. nd tip of the optical fiber optical pen side In case the optical pen has been previously disconnected from the optical pen it is possible that the second tip of the optical fiber should be cleaned as well Disconnect the optical fiber from the optical pen then clean it as described in step 3 In case the problem persists contact the manufacturer at after sale stilsa com for instructions Page 44 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D 12 3 Replacement of the halogen lamp The halogen lamp is the only item subject to wear and has a service life of about 1000 hours A replacement lamp is supplied with the sensor The operator may obtain more lamps if necessary from STIL or from a local distributor To replace a defective lamp proceed as follows 1 Switch off the apparatus and disconnect the mains lead If the appliance was previously switched on wait at least 15 minutes for the temperature of the light box to cool down to an acceptable level This is essential because the temperature in the internal light box may exceed 100 C and cause sever e burns if the operator is too impatient 2 Using a screwdriver unscrew the two screws securing the light box to the rear panel of the apparatus 3 Slide the drawer backwards the light box cannot be completely removed from the apparatus Page 45 of 49 STIL CHR 150 Operating and maintenance
57. ode Advanced functions Page 43 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 12 Maintenance 12 1 Handling the optical fiber When no optical fiber is connected the fiber socket located on the controller front panel must at all times be fitted with its protection cap to avoid contamination of the fiber tip which could result in malfunctioning of the sensor Avoid putting anything on the optical fiber or laying it on the floor not to stamp it Avoid wringing or bending it upwards 70 degrees The best way to avoid contamination of the optical fiber lead is to keep it permanently connected at both ends or if it is necessary to disconnect it to immediately fit a protective cap on the socket at the controller front panel 12 2 Cleaning The first symptom indicating the presence of dust or dirt on the of the optical fiber tips or inside a fiber connector is an increase in the level of the dark signal In such a case when the sensor receives the Dark command it issues a warning on the LCD screen e g much light at s rate lt 30 Hz This means that the dark signal is too high for operating at the indicated sampling rate Other symptoms are increased noise and a reduced dynamics In this case please carry out the following procedure Step 1 Check that the dark signal was acquired with no object present within the measuring range Mask the extremity of the
58. of the window Keys F2 and F3 are then used for displacing the edges of the valid thickness window respectively to the left or to the right Page 17 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D Example starting from non bracketed mode F4 bracketed mode LH edge selected Tif F2 displacement of the LH edge to the left lt F3 displacement of the LH edge to the right F4 non bracketed mode F4 bracketed mode RH edge selected F2 displacement of the RH edge to the left F3 displacement of the RH edge to the right 7 4 Configuring the sensor in Min max measuring mode The Min max measuring mode is optional If your sensor is not equipped with this option skip to the next section 87 5 This mode is dedicated to on line measurement of the thickness of transparent objects To select the Min Max mode press any key then F4 Next use F2 and F3 to display Select measuring mode enter with F4 and select the Min Max mode using F2 or then validate with F1 or F4 Min max measuring mode is used to determine the minimum thickness and maximum thickness measured In this mode the sensor permanently measures the objects passing beneath the optical pen but only records the extreme values observed These values are compared with two thresholds maximum thickness and minimum thickness preset by the operator in order to identify the objects exceeding
59. optical pen with a piece of paper and record the dark signal again Step 2 Check if the problem comes from the controller or from the optical fiber connected to the optical pen Disconnect the optical fiber from the controller front panel Do not cover the socket with the protective cap Record the dark signal If the warning message appears again contact the manufacturer at after sale stilsa com for instructions on cleaning the optical fiber inside the controller Otherwise the problem comes from the optical fiber connected to the optical pen Step 3 Clean the optical fiber tip controller side of the optical fiber Use a very soft lint free cotton cloth or a paper tissue lightly impregnated with alcohol e g methanol or trichloro ethylene Lift the protection tap at the extremity of the green plug and carefully clean the optical fiber tip ensuring that the product used does not leave any stains or marks on drying the product should evaporate almost immediately after wiping with the cloth Cleaning mouvement should be radial from the fiber tip outside and not circular in order to pull dust off the fiber tip Caution The optical pen output lens has an anti reflection coating Do not use any solvents which could damage this coating as this would reduce the performance of the sensor Connect the optical fiber mask the optical pen and acquire the dark signal again If necessary repeat step 3 several times Step 4 Clean the seco
60. ram below shows an example of the operating sequence Activate No Inspection No Inspection No inspection inspection activated inspection activated inspection signal Max threshold Thickness ES Defect No defect Defect detected signal 7 4 2 Experimenting with Min max measuring mode A Prepare a thickness sample and determine the min and max thicknesses e Connect an optical pen to the sensor select the optical pen in the Select confocal sensor window of the control panel configuration menu e Configure the sensor in Thickness measuring mode confocal 2 surfaces e Execute a Dark signal measurement e Place a variable thickness transparent sample within the measurement range of the optical pen for example an ophthalmic contact lens a bottle or a glass The thickness must be compatible with the thickness measurement range of the optical pen see Configuring the sensor in Thickness measuring mode Configure the sensor for the refractive index of the sample e Centre the sample within the measurement range and adjust the sampling rate e Move the sample horizontally in order to measure the thickness variation from one point to the next on the sample Record the min value EO and max value E1 of the thickness B Configure the sensor in Min max mode e Connect the coaxial Sync in plug Activate inspection input to a switch in order to be able to sw
61. rometric Optical principle Confocal microscopy with chromatic encoding White light interferometry Pen models All confocal mode pens Interferometric pen CHR models All All CHR 150 CHR 150 CHR 150 PC CHR 150 PC Availability Standard Standard Optional Optional Thickness Distance face 1 Simultaneously Distance Distance face2 Thickness measured Intensity Intensity face 1 Min thickness Intensity data items Barycenter Intensity face 2 Max thickness Quality indicator Barycenter face 1 Barycenter face2 Metrological test with certificate Yes No No No Distance On line Thickness Application measurement Thickness thickness measurement surface measurement from measurement from 2 um roughness 25 um microtopography Data items used by the manufacturer for calibration of the sensor Page 15 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 7 2 Configuring the sensor in Thickness measuring mode In this measuring mode the sensor searches for 2 signals reflected from the 2 faces of the sample If they are found it calculates the intensity and Distance of face 1 front face i e the nearest face the Distance and intensity of face 2 rear face and the thickness All these data are available simultaneously If the sensor can only detect one signal all the data are reset on zero This can occur if one or other face of the sample
62. s by the sensor improves the signal noise ratio When the averaging factor is greater than 1 the sensor transmits data at the rate fr f where fr data transmission rate fs sampling rate averaging factor Thus for a sampling rate of 1000 Hz and an averaging of 10 the sensor provides 100 measurement points per second In order to obtain measurements without averaging set the averaging factor at 1 Averaging is especially useful for difficult samples for which the signal is low even at the minimum sampling rate Sometimes averaging is used simply to reduce the data transmission rate Recommendation Do not use high averaging for moving samples this reduces the transverse resolution and may lead to false measurements The CHR 150 provides two types of time domain averaging data averaging and spectral averaging In the first type the averaging is performed on the measured data after processing in the second type it is performed on the spectrometer signal before processing The data averaging factor and the spectral averaging factor are independent The last factor is rarely used Recommendation To obtain non averaged measurements set both averaging factors at 1 Page 26 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 8 7 1 Averaging of computed data Data Averaging Data averaging Function Set request data averaging Con
63. s is encoded over 15 bits 0 32767 To obtain the thickness in using this mode use the following relation Interferometric thickness Value transmitted x Measuring Range refractive index x 32767 Note In Binary format 2 bytes are transmitted for each data item The unused bits the most significant bit for Distances thicknesses and barycenters the 3 most significant bits for Intensity are reset on zero Thus the most significant byte for an data item can never be equal to OxFF Note The relationship for decoding Thickness in Interfer thickness mode and in Thickness mode are different in the interferometric mode the refractive index divides the data transmitted whereas in Thickness mode it multiplies the data transmitted Page 36 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 10 Advanced functions 10 1 Detection Threshold This parameter defines the threshold beneath which the CHR150 will not detect any valid Distance information since the signal noise ratio is too low to provide a significant measurement This threshold is expressed in levels of grey at the top of the spectrometer spectral peak and may vary between 0 and 4096 By default this threshold is set at the value 0035 which is the recommended value in Distance measuring mode It is recommended to set the value at 0065 when the sensor is operating in Thickness
64. strial environments for in line inspection during production process and in laboratory environments as high precision instruments The CHR sensors can be used to measure any type of object transparent or opaque polished or rough and any material metal glass ceramic plastic semiconductor fabric paper leather and do not require any preparation of the sample They provide simultaneously Y the distance of the measured sample point Y the intensity of the retro diffused light beam Y the thickness of a transparent sample For further information on the optical measurement principle which forms the basis of the STIL technology and for an overview of available products visit the STIL company web site at the following address www stilsa com 2 Presentation of the CHR 150 The CHR 150 consists of an opto electronic unit controller and one or more interchangeable chromatic objectives optical pens each of them equipped with an optical fiber cable 2 1 Controller The controller comprises a light source Tungsten Halogen lamp a spectrometer and a DSP based processing board This board controls data acquisition performs the computation and provides display and data transmission functions via the RS232 port or via the 0 10 V analog outputs The front panel of the controller features LCD display Control panel Sensor Input Optical fiber lead On Off switch socket 4 Reys keypad Sensor Input
65. these limits The Activate inspection input determines the time interval for thickness measurement In the Closed state the sensor saves the minimum and maximum thickness values measured and compares them in real time with the two thresholds defined by the operator If a thickness measurement exceeds these limits the Defect output signal is activated triggering for example ejection of the object off the production line At the end of the measurement i e when the Activate inspection input returns the open state the min and max thicknesses are transmitted via the serial link as data 7 and 8 see Select output data 7 4 1 Signal specifications e The Activate inspection input and Defect output replace respectively the Sync input and Sync out outputs e Closed state of the Activate inspection input the 2 pins for this signal are short circuited or connected together by an impedance of less than 100 ohms The sensor delivers a voltage of 5V into an impedance of 1 kOhm thus limiting the current to 1 mA e Defect output This output is connected to both pins of an insulated static relay It switches to the Closed state as soon as a defect exceeded threshold is detected The maximum external load for this output is 40V DC and 0 5 Amp Page 18 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D The diag
66. tio at 100 to inhibit the double DCY100 ready frequency mode SHZ32 Sets the free frequency at 32 Hz SHZ32 ready SHZ Interrogates the exact value of the sampling rate SHZ 232 0169 Hz ready SHZ489 Sets the free frequency at 489 Hz SHZ489 ready SHZ Interrogates the exact value of the sampling rate SHZ 489 206800 Hz ready SHZ488 Setsthe free frequency at 488 Hz 5HZ488 ready SHZ Interrogates the exact value of the sampling rate SHZ 489 206800 Hz ready the closest value is still 489 2 Hz the value has not been modified SHZ487 Sets the free frequency at 487 Hz SHZ487ready SHZ Interrogates the exact value of the sampling rate SHZ 487 440800 Hz ready This time the value has been modified SRA Interrogates the sensor for the index of the current SRA255 4801Hz preset sampling rate Following an SHZ command the index switches automatically to 255 to indicate that no preset sampling rate is currently selected SRA3 return to the Preset sampling rate mode select SRA3 ready sampling rate of 30 Hz Page 24 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 8 4 Measuring mode selection The different measuring modes are described in the Going further chapter The Mode command is used to Set request the index of the current measuring mode Index 0 1 2 3 Measuring mode Distance Thickness Interferometric
67. trol Panel Press any key F4 then move left with F2 until Data averaging Command AVRn AVR Parameter Value returned averaging between 1 and 999 Example AVR10 8 7 2 Averaging of raw signal Spectral Averaging An alternative to data averaging this function averages several successive acquisitions of the optical signal then calculates the Distance data from this averaged signal This function is useful when the optical signal has a very low level as it improves the signal noise ratio As with data averaging spectral averaging reduces the number of measurements provided by the sensor Spectral averaging Function Set request spectral averaging Control Panel Press any key F4 then use F2 F3 until Spectral averaging Command AVSn or AVS Parameter Value returned n averaging between 1 and 99 Example AVS10 8 8 Synchronisation signals The synchronisation signals and their use are described in the Going further chapter 8 8 1 Start trigger standby Start Trigger The Start Trigger function puts the sensor on standby for a Trigger signal at the Sync in input pin 1 on the SUB D connector cf Presentation of the CHR 150 The sensor activates as soon as a rising front is detected at the Sync in input Transmission of measurements restarts on receipt of the signal with a response time of the order of 10 microseconds
68. uch as a glass slide a piece of cellophane a transparent plastic film or any other flat transparent sample If it is a sheet or film ensure it is pulled tight Also check that the axis of the optical pen is normal to the surface of the sample The sample thickness should be in the range specified in the table above Slowly move the object to position both faces within the measurement range and to obtain two signals of comparable intensity If the signal saturates adjust the sampling rate Recommendation If you manage to obtain a measurement in Distance mode Confocal 1surface but in Thickness mode Confocal 2surfaces the thickness is zero check the following points e The thickness of the sample must be compatible with the measurement range limits see the table The sample must be sufficiently transparent The sample must be pulled tight The optical axis must be normal to the surface of the sample The sampling rate selected in the Sensors window must be the lowest in the list 30 Hz Page 16 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D 7 3 Configuring the sensor in Interferometric measuring mode The Interferometric measuring mode is optional If your sensor is not equipped with this option skip to the next section 87 4 To select the Interferometric measuring mode press any key then F4 Next use F2 and F3 to display Select measuring
69. uch as the approach of an object travelling on a conveyor belt This mode must be activated by a special command cf Start Trigger On receipt of the command the sensor stands by for the trigger signal The transmission of measurements starts as soon as a rising front is detected at the Sync in input the response time being of the order of 10 microseconds irrespective of the sampling rate Note 1 The use of synchronisation signals is optional In the event that the signals are not used do not connect anything to the coaxial socket 2 For sensors having the Min max option the Sync in input and Sync out output are modified to be used respectively as the Activate inspection and Defect signals Experimenting with the Trigger signal Connect the Sync in socket to an adjustable external signal for example TTL 0 5V signal generator Check that the signal is on OV e Select the lowest sampling rate Connect the sensor RS232 socket to COM port on the PC and Start the Hyper Terminal utility Open a connection to the CHR as described in the previous section use data averaging to slow data transmission down Observe the data on the Hyper Terminal window e Type TRG The message Waiting for trigger is displayed on the CHR front panel and data transmission stops in the Hyper terminal window e Send arising front OV to 5V to the Sync in input to trigger measurement
70. ured point and the next two OxFF constitute the separator between points Page 34 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D 9 6 Limitation of the amount of data transmissible simultaneously The max number of data items transmissible simultaneously per measured point depends on the sensor sampling rate and on the RS232 link baud rate As far as possible the highest baud rate available should be used The tables below specify the measurement transmission capability according to the serial link baud rate and the sampling rate for both transmission formats Max number of transmissible data items for the Binary Transmission format Serial link baud rate bauds Samplin mte 9600 19200 38400 57600 115200 30 Hz 6 data 6 data 6 data 6 data 6 data items items items items items 100 Hz 3 data 6 data 6 data 6 data 6 data items items items items items 300 Hz 1 data item 2 data 4 data 6 data 6 data items items items items 1000 Hz 1 data item 2 data 4 data items items Max number of transmissible data items for the ASCII Transmission format Serial link baud rate bauds Samplin mte 9600 19200 38400 57600 115200 30 Hz 2 data 5 data 6 data 6 data 6 data items items items items items 100 Hz 1 data item 3 data 4 data 6 data items items items 300 Hz 1 data item 1 data item 3 data items 1000
71. ve the modifications made by displaying the following message Save settings in EEPROM If the Yes key is pressed the modifications are saved permanently otherwise the modifications are lost as soon as the CHR 150 is switched off The entire menu trees are presented next pages Page 9 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D Main menu e To access the Main menu of the Control panel press any key e The S Rate and the configuration menus are both described below Hate Menu Free Double Exposure Cycle Frequency Page 10 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 Rev D Configuration Menu CONFIG F2 Set Select Serial data _ detect measuring ASCII BIN LCD Take white threshold mode Contrast reference Data averaging Select Set serial confocal output Serial port sensor data Baud Rate Spectral averaging Set default parameters Page 11 of 49 STIL CHR 150 Operating and maintenance manual Doc ref CHR2 001 P2 D 6 2 Selecting the optical pen The CHR 150 controller may hold up to 6 calibration tables corresponding to 6 different optical pens Available optical pens and their characteristics may be consulted in STIL website www wtilsa com Optical pens are passive devices and the controller can not identify the optical pen which is physically connected to it so the op

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