DMI Universal Multichannel Instrument
Contents
1. DMI Universal Multichannel Instrument User Guide MAN 00018 R5 If the equipment described herein bears the C symbol the said equipment complies with the applicable European Union Directive and Standards mentioned in the Declaration of Conformity DMI OPERATING MANUAL SAFETY INFORMATION The following safety instructions must be observed whenever the DMI instrument is operated Failure to comply with any of these instructions or with any precaution or warning contained in the DMI Operating Manual is in direct violation of the standards of design manufacture and intended use of the DMI conditioner FISO Technologies inc assumes no liability for the customer failure to comply with this safety requirments This product is not designed with components of level of reliability suitable for use in life support or critical applications IN NO CASE WILL FISO TECHNOLOGIES INC BE LIABLE TO THE BUYER OR TO ANY THIRD PARTIES FOR ANY CONSEQUENTIAL DAMAGE OR INDIRECT DAMAGE WHICH IS CAUSED BY PRODUCT FAILURE MALFUNCTION OR ANY OTHER PROBLEM IMPORTANT SAFETY INSTRUCTIONS When using any electrical appliance basic safety precautions should be followed including the following WARNING Use only the wall plug in power supply or the power cord delivered with your DMI instrument and verify that the voltage specifications indicated on the wall plug in power supply or indicated near by the panel power connector are com2. Note that in the case of absolute pressure type of transducer FISO Technologies provides separately a calibrated value of E The offset function in Internal Unit allows the user to enter this value and assign it to the Gage Factor of that transducer See section 2 1 3 2 Force amp Load Transducer the Gage Factor of this transducer provides only the sensitivity S At first the DMI conditioner fixes the default value of the Gage Zero to zero Lro 0 nm However the zero and offset adjustment functions of the conditioner allow the user to automatically define at any time a new value of the Gage Zero See sections 2 1 3 1 and 2 1 3 2 DMI OPERATING MANUAL Displacement Transducer the Gage Factor of this transducer provides only the sensitivity S At first the DMI conditioner fixes the default value of the Gage Zero such as to obtain 0 mm or 0 inch at the center position of the transducer However the zero and offset adjustment functions of the conditioner allow the user to automatically define at any time a new value of the Gage Zero See sections 2 1 3 1 and 2 1 3 2 Refractive index gauge the Gage Factor of this transducer provides only the optical cavity length After a simple zeroing which corresponds to the physical cavity length then the gage is ready to use See APPENDIX A 2 1 3 1 Zero adjustment of the transducer The zero adjustment forces the data measurements of a given transducer to be equal to zero immediately af
3. Since FISO Technologies signal conditioner has the capability to measure the absolute cavity length there is no need for probe calibration The user must first enter and specify a gage factor that indicates to the system that a refractive index transducer is being used User is referred to the ADD and SELECT functions described in this manual While still in air the probe is zeroed NULLing function As a result of the zeroing the conditioner memorizes the cavity length in air which corresponds to the physical cavity length described above From there any new cavity length will be divided by this memorized physical cavity length to give the refractive index As with other probe types displayed resolution can be increased by signal averaging The gage factor to be ADDed and SELECTed that corresponds to a refractive index transducer is G F 08000XX The first 5 digits are specific to a refractive index transducer The last two digits are used to differentiate the refractive index transducers that may be used simultaneously on the same conditioner It is important for each probe connected to the same conditioner to be distinguishable since the physical cavity lengths are saved in the memory location that corresponds to the zero of the probe Using the same last two digits would force the probes to use the same physical length and thus inaccurate measurements will occur It is important to note that the refractive index measured by the system is n
4. always connected to the power supply battery charger 4 to 5 years According to the above table waiting for a complete discharge of the batteries before recharging strongly reduces the battery lifetime so it is not recommended DMI OPERATING MANUAL On the other hand it is recommended during a long period storage of the DMI to recharge the battery once every six months in order to maintain its original capacity The time to recharge the external battery can vary from 2 to 8 hours depending on the remaining charge of the battery 1 4 2 Operating status The red and green LEDs provide information to the user about the operating status of the DMI as explained in the following table Red LED Green LED ACQ Status ON OFF e DMI is ON Acquisition Mode not activated ON ON e Acquisition Mode activated e Data measurements going on e Acquisition Mode activated OFF ON e DMlis in the Sleep State i e waiting for the next data measurement OFF OFF e The DMI is off The DMI can be remotely turned on by sending a string character over the RS 232 serial link or by calling the DMI internal modem See next sections 1 4 2 1 Automatic shutdown The DMI goes completely off automatically after 15 minutes of inactivity unless it is in Sleep Mode The DMI can be remotely turned off at any time with the aid of SYSTEM OFF WF remote control command see REMOTE CONTROL COMMANDS MANUAL or with FISOQCommander software T
5. COMMANDS MANUAL or with the aid of FISOCommander software Delayed Acquisition tab An Acquisition Program consists of the following parameters 1 Starting Time 0 to 23h59m59 9 See PROGRAM STARTTIME command 2 Starting Date yyyyMMdd See PROGRAM STARTDATE command 3 Acquisition Rate 0 05 to 09h59m 95 See PROGRAM RATE command 4 Averaging Time 0 05 to 54m36 75 See PROGRAM AVERAGE command 5 Ending time 0 05 to 23h59m59 95 See PROGRAM ENDTIME command 6 Ending Date yyyyMMdd See PROGRAM ENDDATE command 22 DMI OPERATING MANUAL An Acquisition Program is said enabled when its Acquisition Rate value is different from zero One can disabled a given Acquisition Program by setting its Acquisition Rate to zero To activate a set of enabled Acquisition Programs first use the ACQUISITION MODE TM3 or TM9 command to select the appropriate programmable Acquisition Mode Then send the TRIGGER TS1 command These steps can be done as well in the Delayed Acquisition tab of FISOCommander software The DMI will run the set of activated Acquisition Programs in chronological order as given by the Starting Time and Starting Date TM9 mode only of each program In case of time and date overlap between different Acquisition Programs the Starting time or date of a given Acquisition Program has priority over the Ending time or date of the preceding Acquisition Program It means that the DMI may jump to the next Acquisition Program whi
6. SI units 3 M 1 4 t 2000 10 25 WX 17h35 V M n r i Kb x 3 t 4 nv Templ t Temp2 t Pressl t Press2 Gage Name 4755823 t 4852321 t 6024195 t 6025592 152 1 t 148 9 t 54 96 t 55 10 n r Gage Factor 152 3 t 148 8 t 54 96 t 55 14 n r 152 5 t 148 6 t 54 92 x 55 10 ER 152 6 t 148 8 t 54 94 M 55 16 n r 152 8 t 148 9 t 54 94 t 55 10 n r 153 9 t 148 7 t 54 92 t 55 14 n r 154 0 t 148 5 M 54 94 V 55 12 n r Data on the same line are separated with a tab character Each line ends with Line Feed and Carriage Return characters 4 4 4 4 Deleting the Memory Buffer We recommend clearing the contents of the memory buffer once the data measurements have been downloaded This ensures that the full capacity of the memory buffer is available for the next Acquisition Sessions To delete the contents of the memory buffer use the CLEAR BUFFER CB remote control command or go in the Delayed Acquisition tab of the FISOCommander software 4 4 5 Direct Data Acquisition If a direct data acquisition mode is selected each data measurement is immediately sent to the RS 232 or modem link of the conditioner without storage in the memory Use the ACQUISITION MODE TMZ or TM8 remote control command to select the appropriate direct Acquisition Mode and then send the TRIGGER TS1 command to activate the acquisition When the direct data acquisition is set in manual scan RS 232 TM2 mode a space character separates
7. any channel Repeat the preceding steps for all the transducers that will be used with your DMI signal conditioner in order to create the so called Gage List This list can contain up to 50 different Gage Factors This list is stored in a non volatile memory so it will not be erased when turning off the DMI If not already done connect each transducer to the corresponding channel input connectors of the DMI signal conditioner 3 Assign the Gage Factors to the measuring channels To use a transducer with the DMI you must first assign its Gage Factor to the corresponding channel DMI OPERATING MANUAL Select a DMI channel by moving the mouse pointer into the Transducer assignment box Double click on the desired channel Make sure that your pointer is located on the channel no The selected channel will then appears in bold n the Transducer assignment box click on the selected channel cell located in the Gage Name and Gage Factor column A drop down menu will appear and propose you all the Gage Factor stored in the Gage List According to the transducer select the corresponding transducer Gage Factor Note the default assigned Gage Name and Gage Factor is FISO1000 for internal use only Repeat the preceding steps for all the transducers that will be used with your DMI conditioner Turn off all unused channels by selecting the OFF option in the Gage List 4 Zero adjustment of the transducers Y Go directly to
8. each data measurement taken on a single channel that is sent to the RS 232 output The string READY is sent at the end of the last data measurement No information is given on the acquisition parameters the Gage Factor the unit of the measure etc The next figure shows the output of seven data measurements taken on a single channel 24 DMI OPERATING MANUAL FIGURE 5 DATA MEASUREMENTS OUTPUT FOR DIRECT DATA ACQUISITION WITH RS 232 TM2 MODE 42 5 92 5 39 5 22 4 22 6 232 5 292 5 READY The string READY is sent at the end of the Acquisition Session When the direct data acquisition is set in automatic scan RS 232 SCAN TM8 mode each data measurement collected on the different channels are placed on separate lines The line begins with the channel number ex CH01 followed by a tab character then the data measurement and it terminates with a line feed n and carriage return r character No information is given on the acquisition parameters the Gage Factor the unit of the measure etc The example below shows the output of data measurements when in automatic scan mode FIGURE 6 DATA MEASUREMENTS OUTPUT FOR DIRECT DATA ACQUISITION WITH RS 232 SCAN TM8 MODE example shows channels 1 to 4 CHO1 t22 5 n r CHO2 t22 4 n r Channel number 1103 22 4 n r HO4 t22 MO D measurement H01 t22 2 n r ata me HO2 t22 1 n r HO3 t22 4 n r Tab character Gue4 22 3 n r CHO1 t22 3 n r CH02V
9. not be smaller than the Averaging Time If the user tries to set the Averaging Time larger than the Acquisition Rate the later will be automatically reset at the start of the acquisition to a value equal to the Averaging Time 4 4 3 Data Acquisition in Automatic Scan When the conditioner is set to automatic scan the data acquisition is performed by storing or by directly outputting to the RS 232 or modem link at every interval of time given by the Acquisition Rate the data measurements taken during one scanning cycle See Figure 3 for the timing diagram of the data acquisition when in automatic scan It should be noted that the data measurements are taken according to the Averaging Time initially set by the user section 4 1 That is the averaging process is done on a 20 Hz sampling rate basis which means the DMI conditioner calculates an average value of the data readings collected at every 0 05 second and during the period of time set with the Averaging Time parameter The averaging process is always started at the beginning of the period as set with the Acquisition Hate parameters For example a DMI 32 with its thirty two channel activated has the Averaging Time set to 1 90 second and the Acquisition Rate set to 120 seconds The conditioner starts the acquisition on channel no 1 with the averaging of 38 data readings 20 Hz x 1 90 s The resulting data measurement is then stored in memory or outputted to the RS 232 link Thereafter the condi
10. of the transducer is located inside the rigid region close to the tip e Strain Gage do not touch the sensitive part of the transducer This part must be kept clean until it is bonded e Avoid tension or twisting of the fiber optic cable e Avoid pinch points and Scissors when setting in place the transducers e Do not pull on fiber optic cable to clear tangles carefully unwind instead e Avoid allowing fiber optic connectors to drop or scrape on hard surfaces e Keep the surface of the fiber optic connector clean 1 5 2 Cleaning the transducer connectors ST type For proper use of the fiber optic transducers the fiber optic connectors must be kept clean and free of dust at all times Any dust may obstruct the light transmitted from one connector to the other and reduce the signal to noise ratio to an unusable level It is a good practice to always clean the transducer connector before mating it to the conditioner Wiping the end with low lint tissue such as Kimwipes or lens cleaning tissues is a simple and easy way to clean transducer connectors By keeping your transducer connectors clean you will also prevent the contamination of the DMI input connectors However we recommend cleaning the DMI input connectors occasionally Use the specially designed 2 5 mm Mini Foam Swab provided with our cleaning kit for cleaning the input connector of DMI 1 5 3 Transducer technical notes Additional information is available on specific fiber
11. operating principle of this function differs according to the selected unit A Offset with physical units The offset adjustment function in physical units is the same as the zero adjustment except that the entered value is different from zero The entered value will thus correspond to the data measurements displayed right after the function is activated Using the ZERO PHYSICAL ZO Offset value remote control command or with FlSOCommander software lt lt PHYSICAL gt gt button in the Config Transducer tab the offset value is entered in the units that correspond to the transducer actually connected to the selected channel For example the value is entered in psi or Bar in the case of a pressure transducer 1 Immediately after receiving the ZERO PHYSICAL ZO Offset value remote control command or after confirming your offset entry in the Physical dialog box of the FlSO Commander software the conditioner performs a measurement of Leavin of the transducer 2 Thereafter the conditioner recalculates a new value of L from the measured value of Leaviry and the offset value just entered the later being assigned to M in equation 2 In other words the conditioner calculates a L value that gives a value of M equal to the offset value Lero L S x offset value zero cavity DMI OPERATING MANUAL 3 At this point one could see that the values of the data measurement taken right after the offset adjustment are e
12. principal characteristics of the offset adjustment that should be reminded are The measurement of the cavity length 7L performed during the offset adjustment in physical units is done the same way as the data measurements see section 4 0 Thus parameters such as the Averaging Time will affect the results Obviously the value of the stimulus must be as stable as possible during the measurement of La in order to make an accurate offset adjustment A new value of L is redefined each time the offset adjustment function is activated The new value replaces the preceding one and becomes the current value of L To look for the current value of Lero use the ZERO DOWNLOAD SEE REMOTE CONTROL COMMANDS MANUAL remote control command or go in the Config Transducer tab of the FISOCommander software Despite the fact that the offset adjustment is only active with the selected measuring channel this function is transducer specific the resulting value of L will be associated to the Gage Factor currently assigned to the selected channel That means the Gage Zero will always stick to its associated Gage Factor even though the later is re assigned to another channel Note that removing a Gage Factor from the Gage List will erase its associated Gage Zero as well The offset adjustment function is automatically disabled in the case of a temperature transducer The offset adjustment function with Internal Unit can be useful to enter a calibrated v
13. software using Windows operating system 1 2 3 4 5 Insert the CD ROM in the CD ROM drive If your computer is handling automatic loading will prompt you the installation menu automatically If not press Start and select Run Type d Setup exe where d is your CD ROM drive location and press Enter Once completed launch the software 2 Save the Gage Factors in the memory of the DMI The Gage Factor is a 7 digit number located near by the fiber optic connector of the transducer This number provides the DMI signal conditioner with the information related to the transducer type sensitivity etc Before using a transducer its Gage Factor must first be saved into the non volatile RAM memory of the conditioner See section 2 1 for more details In FiSOCommander software go to the Configuration Transducer tab In the Transducer Gage Factor box click on Add button Enter the transducer Gage Factor written on a tag close by its connector If you are reading the Gage Factor from the clear plastic box pay attention to do not confuse the Gage Factor with the identification number Once completed click on OK For easier Gage Factor management you may enter a mnemonic name called a Gage Name for every Gage Factor stored This entry is optional If you do not want to save a Gage Name click on OK The Gage Factor will then be stored and will remain in the memory buffer even if itis not assigned to
14. 000 The Gage Name associated to this factor is FISO This factor is permanently saved into the conditioner memory and cannot be erased The Gage Factor is printed on a label close to the fiber optic connector of the transducer It is a 7 digit number where the first digit indicates the type of transducer 0 being the default number value and is not associated with a specific type of transducer The different numbers used to identify the transducer are listed next 0 Is used for non specific type transducers 08 Is used for refractive index transducers OX is reserved for future use Is used for non compensated strain gage transducers Is used for pressure transducers of type 1 Is used for force amp load transducers of type 1 Is used for temperature transducers of type 1 Is used for compensated strain gage transducers Is used for pressure transducers of type 2 Is used for force amp load transducers of type 2 Is used for linear displacement transducers Is used for temperature transducers of type 2 co Joo Po In the case of force amp load and pressure transducers the second digit of the Gage Factor is used to differentiate within a transducer lot the ones with same type and sensitivity The third digit corresponds to a multiplying factor while the last four digits correspond to the sensitivity S of the transducer divided by the multiplying factor It is the same for the strain gage and the linear displacem
15. 000 data measurements that may limit the maximum value of the Acquisition Duration To use the full capacity of the memory simply set the Acquisition Duration to 00h00m00 00 In that case the Acquisition Session will terminate when the memory buffer is full The other time based parameters of the Acquisition Session are the Averaging Time and the Acquisition Hate These acquisition setting parameters can be adjusted with the remote control commands ACQUISITION AVERAGE and ACQUISITION RATE respectively See preceding sections 4 4 4 2 Programmable Data Acquisition Up to five different Acquisition Sessions can be programmed and each one of them can be activated at a specific date and time These programmed Acquisition Sessions are called the Acquisition Programs To create an Acquisition Program the user must download into the conditioner memory from a PC computer the program parameters starting and ending date amp time Averaging Time etc Each Acquisition Program is numbered from one to five This programmed mode of acquisition can be activated with the TRIGGER TS1 remote control command or with FiSOCommander software in the Delayed Acquisition tab When activated the DMI conditioner will start the Acquisition Programs in chronological order as given by their respective Starting Date amp Time The user creates its own Acquisition Programs via the different PROGRAM remote control commands see PROGRAM Z command in REMOTE CONTROL
16. C or deactivation after activation READY string See PROGRAM PROGRAMCONT Te Autori Y TS1ITSc commands paid a amireng IN REVOTF repeated every clay SC CONTROL COMMANDS day or deactivation MANUAL None UN Averaging Tine Aca Durati READY TM Manual Yes TSi TSo conmands Starts intrediately dad n Acquisition Rate after activation READY string TMs RESERVED FOR INTERNAL USE None Aca isition D A A ing Ti SCAN TIME Automatic Yes TSi TSo commands Starts irrrrediately Sa S en s bd R activation or deactivation Acquisition Rate TM RESERVED FOR INTERNAL USE Z2 SCAN TM No yrs None continuous Averaging Ti e d S Direct isition A d Ge as SCH SE e eelerer Ge acquisition NM after activation Ending Date and 7 PROCRAN PROGRAMDATE TM Automatic Yes TS1ITSc comens perds a hec us dime sius Starting Tine Ve Ud CONTROL COMMANDS deactivation Note the DMI switches immediately to manual or automatic scan according to the Acquisition Mode selected DMI OPERATING MANUAL Figure 2 Timing Diagram of Data Acquisition in Manual Scan Mode Example given with channel no 1 selected The Conditioner goes automatically into Sleep State if the remaining time Averaging Time adjustable gt 0 05 s before the next measurement is larger than 12 seconds Acquisition Rate adjustable gt Averaging Time Channel no 1 selected 3 Data acquisition repeated at every interval
17. DIX A REFRACTIVE INDEX TRANSDUCERS es sssssuus 27 1 0 GETTING STARTED 1 1 PRODUCT AND FEATURE DESCRIPTION The DMI signal conditioner is a universal multichannel fiber optic signal conditioner It is used with FISO Technologies fiber optic transducers to perform Strain Temperature Force amp Load Displacement Refractive index and Pressure measurements in hostile locations that were formerly inaccessible with other measuring instruments The DMI conditioner has a 14 bit resolution without averaging with a relative dynamic range of 15 000 1 The resolution and the full scale output depend on the type and sensitivity of the transducers used with the DMI Data averaging data logging direct and delayed acquisition etc are different features that come with the DMI The DMI signal conditioner can be remotely controlled via a PC computer using the FISO Commander software More details can be found in the following sections with instructions about installing and using your DMI conditioner 1 2 INSTALLATION 1 2 1 Installing the DMI e The DMI may be powered by an external power supply or with the provided battery see section 1 4 1 Whenever it is possible use the provided external power supply to operate the DMI Connect the wall plug in or tabletop power supply to a power outlet Connect the power cable to the DMI power connector Figure 1 VERIFY THAT THE VOLTAGE SPECIFICATIONS INDICATED ON THE WA
18. LL PLUG IN POWER SUPPLY COMPLY WITH THE AC VOLTAGE AND FREQUENCY DELIVERED AT THE POWER OUTLET WARNING DMI OPERATING MANUAL THE FRONT PANEL OF THE DMI SIGNAL CONDITIONER IS DISPLAYED IN FIGURE 1 PRIOR TO USE THE SYSTEM THE USER SHOULD MAKE SURE TO HAVE ALL CONNECTIONS MADE REFER TO SECTIONS 1 4 AND 1 5 for more information about the front panel connections Power connection section 1 4 1 RJ 11 Modem connection Section 1 4 4 Operating Status LEDs Section 1 4 2 Hardware reset button section 1 4 5 RS 232 connection section1 4 3 ON OFF button see automatic shutdown and anti shutdown functionalities at section 1 4 2 1 Measuring channels and their fiber optic input connectors SECTION Figure 1 Front panel of DMI 1 2 2 Installing the transducers 1 Connect the transducer connectors to the input connectors of the DMI Figure 1 READ THE HANDLING PRECAUTIONS IN SECTION 1 5 1 BEFORE INSTALLING AND USING THE TRANSDUCERS FOR THE FIRST TIME CAUTION DMI OPERATING MANUAL 1 3 GETTING STARTED Follow the next instructions to make your first measurements with the DMI conditioner 1 nstallation of FISO Commander software The FlSOCommander software is easy to use and provides an access to all the signal conditioner parameters For more information about the software functionalities please refer to the FlSOCommander user s manual Here are the steps to install the
19. alue of Lero This is particularly the case with absolute pressure transducers 4 DMI OPERATING MANUAL 3 0 CONDITIONER REMOTE CONTROL 3 4 FISOCOMMANDER SOFTWARE FISO Technologies offers specially designed remote control software for the DMI conditioner This software called the FISOCommander provides an effective and simple tool for remotely controlling your DMI as well as for downloading and viewing in real time the data measurements directly from your PC computer The figures below show few of the many features offered by this software FISO Commander is offered in a free demonstration version Lite version or is sold in Full version For more information about the FiSOCommander please refer to the software user s manual ER E xi Transducer selection Version K271 Serial Number 88v4067 Hardware version Pova2UTC4L115 ComPot P z About Gauge Name and Gauge Factor Gauge Zero Channel 1 FISO 1000 Channel 2 TEMP2 4657653 Channel 3 TEMPO 3001000 x Channel 4 p Transducer Gauge Factor r Transducer selection _ Hemd Channel 2 Channel 3 TEMPO 3001000 Channel 4 TEMP1 9756323 Gauge Factor FISO 1000 TEMP2 4657653 TEMPO 9001000 9756323 OFF FISO 1000 TEMP2 4657653 TEMP1 3756323 Channel selected 1 Transducer Offset Transducer Assignment dialog box Null In
20. ck on OK to have your computer modem call the DMI internal modem Once the communication is established with the DMI the FiSOQCommander software will bring its standard user interface window 1 4 5 Hardware Reset Button This button is used to reset the DMI signal conditioner to its original configuration as set at the factory For a full hardware reset the power supply must be connected to both a power outlet and your DMI conditioner Note that all the Gage Factors of the Gage List and their associated Gage Zero will be erased from memory 1 4 6 Memory The DMI signal conditioner is equipped with a non volatile RAM type memory where all the settings of the conditioner Gage Factors Gage Zero etc are stored Each time the DMI conditioner is turned on it is reset with the same settings in use just before the last time it was turned off The DMI signal conditioner has also a non volatile memory buffer which can store close to 50 000 data measurements These stored data can be downloaded to a computer via the RS 232 serial or modem link See section 4 4 4 for more information DMI OPERATING MANUAL 1 5 USING THE TRANSDUCERS 1 5 1 Handling of the transducers READ THE FOLLOWING PRECAUTIONS BEFORE INSTALLING AND USING THE N TRANSDUCERS CAUTION e Avoid sharp radius turns in the fiber optic cable radius less than 10 mm e Temperature probe do not bend the rigid region at the end of the cable The sensitive part
21. eans that one of the DMI Acquisition Modes is activated and still active for example an Acquisition Program is to be started at a set date and time but no data measurements is being taken nor is being planned for at least the next 12 seconds Low power state using system without battery When it goes in low power state the DMI rackmount signal conditioner keeps the minimum hardware ON for remote communication and turns OFF all other non necessary hardware ex Lamps The user has still access to the Hemote Control Commands such as for example downloading data or programming the conditioner This state means that one of the DMl rackmount Acquisition Modes is activated and still active for example an Acquisition Program is to be started at a set date and time but no data measurements is being taken nor is being planned for at least the next 2m30s The lower power state will be set automatically by the system Since the system has no display this event will be transparent for the user 26 DMI OPERATING MANUAL APPENDIX A REFRACTIVE INDEX TRANSDUCERS The refractive index transducer is based on the variation of the optical Fabry Perot cavity length that results from the refractive index properties of the liquid The liquid filled cavity length hereinafter called optical cavity length Loptica is given by the physical cavity length sel multiplied by the refractive index of the liquid niu L el optical Toi uid Physical 4
22. ed channels GAO remote control command DMI OPERATING MANUAL It is strongly recommended to deactivate all unused channels OFF option otherwise the conditioner automatically assign the default Gage Factor 1000 and its corresponding Gage Name FISO Note that when the Gage Factor 1000 or 0001000 is assigned the conditioner gives the actual value of the output signal of the transducer that is the value of its cavity length La This value is given in nternal Units i e in nm See section 2 1 1 2 1 3 Calibration As explained in section 2 1 1 FISO Technologies fiber optic transducers are characterized by a linear relationship between the stimulus M and the output signal produced by the transducer that is the cavity length Leavin of the Fabry P rot interferometer The factory calibration of the transducer is made by measuring for a set of accurately known values of M the corresponding values of Leviy These measurements establish the calibration curve of the transducer by providing the value of the sensitivity S and the value of the Gage Zero Lero Once these two parameters are known it is easy to assign to each measured value of Leavin the corresponding value of the stimulus M The conditioner uses the following equation to calculate and output the values of M as a function of the output values Leaviy of the transducer L cavity Loo S M Caos 2 The factory calibration varies depending of the ty
23. ent transducer except that the last five digits correspond to the sensitivity S In the case of the temperature transducers the last six digits correspond to the sensitivity and the Gage Zero Lero See section 2 1 3 for more information 2 1 2 1 To add or remove a Gage Factor to the Gage List To add or remove a transducer Gage Factor use the GAGE ADD remote control command described in REMOTE CONTROL COMMANDS MANUAL or go in the Config Transducer tab of the FISOCommander software You may enter with the Gage Factor a Gage Name to facilitate the identification of the corresponding transducer The Gage Name can be composed of up to five alphanumeric characters 0 9 A Z If you do not want to assign yourself a Gage Name just enter the Gage Factor The conditioner will then assign a default Gage Name 2 1 2 2 To assign the Gage Factors to the measuring channels To use a transducer with the DMI you must first assign its Gage Factor to the corresponding channel that is the one to which the transducer is connected Use the GAGE SELECT GA Gage Factor or GA Gage Name remote control command as described in REMOTE CONTROL COMMANDS MANUAL or go in the Config Transducer tab of the FISOCommander Your selection must correspond to the Gage Factor of the transducer actually connected to the measuring channel Repeat the preceding steps for all the measuring channels that will be used Select the OFF option to deactivate the unus
24. h the ACQUISITION MODE remote control command See Table 2 and the next sections for additional explanation on each Acquisition Mode When using the FISO Commander software the selection of the proper Acquisition Mode is done automatically by the software 4 4 2 Data Acquisition in Manual Scan When the conditioner is set to manual scan the data acquisition consists of storing or directly outputting to RS 232 or modem link one data measurement at every interval of time given by the Acquisition Rate parameter See Figure 2 for the timing diagram of the data acquisition when in manual scan It should be noted that the data measurements are taken according to the Averaging Time initially set by the user section 4 1 That is the averaging process is done on a 20 Hz sampling rate basis which means the DMI conditioner calculates an average value of the data readings collected at every 0 05 second and during the period of time set with the Averaging Time parameter DMI OPERATING MANUAL The averaging process is always started at the beginning of the period as set with the Acquisition Rate parameters For example if the Averaging Time is set to 40 seconds and the Acquisition Rate is set to two minutes the DMI conditioner will store or output the average value of the first 800 data readings 20 Hz X 40 s of the 2400 20 Hz X 120s available data readings rounded to the closest integer It should be noted that the Acquisition Rate parameter could
25. hannels 4 3 MANUAL SCAN When set to manual scan mode the data measurements are taken with one measuring channel This mode gives the fastest means of measurement that is up to 20 data measurements per second In manual scan the amount of time between two consecutive data measurement is equal to the Averaging Time since there is no stabilization time 4 4 DATA ACQUISITION 4 4 44 Acquisition Modes The DMI conditioner offers different methods of making data acquisition through a selection of several Acquisition Modes These modes are divided into two classes that is the direct data acquisition and the delayed data acquisition the later is subdivided into two other classes data acquisition at set duration and programmable data acquisition The direct data acquisition means that each data measurement is immediately sent to the RS 232 or modem link of the conditioner without storage in the buffer memory On the other hand the data measurements taken during the delayed data acquisition set duration or programmable are stored into memory and must be downloaded with the DATA DOWNLOAD remote control command or with the aid of FISOCommander software Delayed Acquisition tab Each Acquisition Mode offers other options such as data acquisition in automatic or manual scan of the measuring channels The DMI switches immediately to manual or automatic scan depending on the Acquisition Mode that is selected The Acquisition Modes are selected wit
26. he automatic shutdown feature can be disabled and enabled default state with the aid of the POWER MANAGEMENT GPX remote control command See REMOTE CONTROL COMMANDS MANUAL Note this function is irrelevant for NON BATTERY POWERED SYSTEM 1 4 2 2 Anti Shutdown protection The DMI is equipped with an anti shutdown protection that prevent against unattended shutdown that could happen by pushing the ON OFF button while a DMI Acquisition Modes section 4 4 1 is still active In this case the user must hold down the ON OFF button during at least 5 seconds and then release the button to turn off the conditioner Note this function is irrelevant for NON BATTERY POWERED SYSTEM RS 232 Link The DMI signal conditioner is remotely controlled via a PC computer or other computer device with the aid of the RS 232 serial link or the modem connection see next section A set of Remote Control Commands provides all the functions to operate the conditioner For more details about the RS 232 remote control of the DMI consult the REMOTE CONTROL COMMANDS MANUAL If the DMI is off or in Sleep State a string character must be sent to the DMI in order to turn it on DMI OPERATING MANUAL FISO Technologies suggests using its specially designed remote control software for the DMI conditioner This software called the FISOCommander provides an effective and simple tool for remotely controlling your DMI as well as for downloading and viewing in real time
27. iemal Physical Zero 0 Config Conditioner Config Transducer DitectAcquicition Graph DirectAcquisition Bar T ee ee Remu e memes xe MEM D Transducer Configuration Menu pass a i Rate nso FISO Commander English ll Version 4 271 Serial Number S8v4067 Hardware version DOV42UTCALMS ComPot 2 7 About Channel 1 Channel 2 Channel 3 Channel 4 cy A0 gt 120 400 gt 180 000 20 40 em om 100 om wm S o HI z CES MEE oem 20 gt 70 300 gt 30 E Auto Save at every 5 gue L 348 25 99 70 349 85 143 85 Dicicqisiion Graph Direct Data Acquisition window Line Graph Graph DirectAcquisition Bar cH011348 250 Direct Data Acquisition window Bar Graph with alarms 15 DMI OPERATING MANUAL 4 0 THE DATA MEASUREMENT amp ACQUISITION 4 1 DATA SAMPLING AND AVERAGING The signal conditioning of FISO Technologies fiber optic transducers consists of the following steps L The DMI conditioner samples the transducer signal connected to one of the measuring channels at a fix Sampling Rate of 20 Hz Consequently the conditioning process of the sampled signal from the transducer generates one data reading every 1 20 or 0 05 second 2 The data readings generated at this 20 Hz Sampling Rate are averaged during an adjustable period of time as set by the user with the Averaging Time parameter 3 The average value of the data readings referred as the da
28. le the actual Acquisition Program is not terminated yet Note in TM3 mode the Acquisition Programs are run again every 24 hours the date is ignored until the next TRIGGER command is sent to the DMI The following example shows a list of the Hemote Control Commands to send to the DMI for creating a TM9 Acquisition Program SF 3 20001124 Set the Starting Date of Acquisition Program 2 to 2000 11 24 SA 2 013000 Set the Starting time of Acquisition Program 2 to 01h30m00s SG 2 20001126 Set the Ending Date of Acquisition Program 2 to 2000 11 26 SB 2 023000 Set the Ending time of Acquisition Program 2 to 02h30m00s SC 2 000100 00 Set the Acquisition Rate of Acquisition Program 2 to 1 minute SD 3 0010 00 Set the Averaging Time of Acquisition Program 2 to 10 seconds The listing of a given Acquisition Program can be viewed with the PROGRAM SHOW remote control command Refer to the REMOTE CONTROL COMMANDS MANUAL for more information 4 4 4 3 Data Logging and Downloading Each time an Acquisition Session is started a new data file is created and opened in the memory of the DMI conditioner The content of this file includes the data measurements and other useful information on the acquisition The file ASCII characters text file is called the Acquisition Series and can be easily downloaded to a computer with the aid of the DATA DOWNLOAD DD command or using the FISOCommander software The Acquisition Series file incl
29. ll the activated channels in a period of time given by the Scanning Cycle 5 Data acquisition Scanning Cycle repeated at every interval of time given by the Acquisition Rate Time Scale 21 DMI OPERATING MANUAL 4 4 4 Delayed Data Acquisition The DMI signal conditioner has an integrated data logger memory buffer for real time storage of the data measurements The process of making a delayed data acquisition and data storage in memory is called an Acquisition Session The term delayed means that the data measurements will be available as soon as the acquisition session has begun logging 4 4 4 1 Data Acquisition at set duration Use the ACQUISITION MODE command to select the appropriate Acquisition Mode among the ones that have a set duration see Stop parameter in Table 2 The duration of the Acquisition Session is adjusted with the Acquisition Duration parameter Use the ACQUISITION DURATION remote control command to set the value of this parameter or go in the Config Conditioner tab of FISOCommander software To activate the Acquisition Session send the TRIGGER TS1 command Note The data acquisition at set duration can be done with the FISOCommander software as well To stop the Acquisition Session send the TRIGGER TS0 command otherwise Acquisition Session terminates when the elapsed time since the beginning of the session becomes equal to the Acquisition Duration Note that the memory buffer store close to 50
30. n all the FISO Technologies conditioners The unit used to measure Lu is the nanometer this is the internal unit of the conditioner used to represent the output signal of the transducer as opposed to the physical units C Bar etc used to represent the value of the stimulus It should be emphasized that the full scale or the span of the transducer output Leaviy does not begin at zero In other words FISO Technologies fiber optic transducers are made and delivered with an initial cavity length L i not equal to zero 2 1 2 The Gage Factor Before using a transducer with the DMI conditioner its calibration factor called the Gage Factor must be stored in memory and then assigned to one of the measuring channels of the conditioner Up to fifty Gage Factors can be stored in the non volatile memory of the conditioner which represent the so called Gage List The Gage Factor allows the conditioner to 1 Identify the type of transducers connected Know the sensitivity S of the transducer as determined by the factory calibration Know the Gage Zero Lero of the transducer temperature transducers only as determined by the factory calibration 1 The physical signal measured from the fiber optic transducer is a light signal This light signal carries the information about the cavity length of the Fabry P rot interferometer DMI OPERATING MANUAL The Gage List contains a default Gage Factor that is the number 0001000 or 1
31. nty Totormation m ii 1 0 GETTING STARTED E 1 1 1 Product and feature AESCHIPtTION s ccceccccsecccsenesscenssnnencssnenseenesnencssnansasenssuensesanansasenesssneesnanenenes 1 EE TR H 1 2 1 Installing the DM 1 1 2 2 Installing the transducers sse entere nnn sitter 2 1 9 Gelting Started E 3 1 4 Operating Functionalities eiae eese e seen esee saei n nien nani anna nnn n ann n rana annuas nana aa nasa an rasan aaa nnn 5 1 4 1 Power supply and external battery operatton nten tenn nenn nnt 5 1 4 1 1 External battery lifetime cyclic and standby use 5 1 4 2 Obperatingistatus iret teo ctn ceti e tee tee UR rue del eed E ee Eee Bes Lasers eade 6 1 4 2 1 Pee m 6 1 4 2 2 Anti Shutdown protection eene enne en nenas 6 1 4 3 SS IPANU Cm 6 1 4 4 Modem Beien beet 7 1 4 5 Hardware Reset Button aee ette LE ENEE eta x ae rn ead o Fea PER Ed aea Fea Ze 7 1 4 6 MOMO rrer 7 1 5 Using the transdUCers E 8 1 5 1 Handling of the ranscucers eene nennen en nens 8 1 5 2 Cleaning the transducer connectors ST wvpel 8 1 5 8 Transducer technical notes AA 8 2 0 TRANSDUCER amp CONDITIONENHM 55 55 245 45 5 4 5052555 00nsuc En usn nu on cH gu cH nsn i n 9 Al TVAINSOUCCIS IE 9 2 1 1 Principle Of OPSFAtlON TEE 9 2142 The Gage FactQE toit t pix eege E pega eege EENS EE 9 2 1 2 1 To add or remove a Gage Facto
32. of time given by the Acquisition Rate 2 One data measurement produced by the averaging of the data readings collected during the Averaging Time This example shows the averaging of 3 data readings and stored in the memory if using delayed acquisition or sent to the RS 232 or modem link if using direct acquisition 1 One data reading of the transducer collected every 0 05 s Time Scale 20 DMI OPERATING MANUAL Figure 3 Timing Diagram of Data Acquisition in Automatic Scan Mode Example given with channels no 1 to 4 activated Acquisition Rate adjustable gt Scanning Cycle Scanning Cycle Scanning Time x Number of activated channels The Conditioner goes automatically into Sleep State if the remaining time before the next measurement is larger than 12 seconds Scanning Time Averaging Time 0 1 second Stabilisation Period 0 1s Averaging Time adjustable gt 0 05 s Sampling Rate 0 05 s 2 3 Measuring Channels A 1 One data reading of the transducer collected every 0 05 s 2 One data measurement produced by the averaging of the data readings collected during the Averaging Time this example shows the averaging of 3 data readings 3 One data measurement per channel stored in the memory if using delayed acquisition or sent to the RS 232 or modem link if using direct acquisition at every interval of time given by the Scanning Time 4 Data measurements completed on a
33. ommander software Despite the fact that the zero adjustment is only active with the selected measuring channel this function is transducer specific the resulting value of E will be associated to the Gage Factor currently assigned to the selected channel That means the Gage Zero will always stick to its associated Gage Factor even though the later is re assigned to another channel Note that removing a Gage Factor from the Gage List will erase its associated Gage Zero as well The zero adjustment function is automatically disabled in the case of a temperature transducer The zero adjustment should be performed when the strain gage force amp load refractive index or gage pressure transducers are being used for the first time for absolute pressure see section 2 1 3 2 It is recommended to take note of the current value of Lo when doing a zero adjustment Knowing that it is possible to re enter an arbitrary value of L it could be useful in the case the conditioner is reset or its memory content is lost See the ZERO DOWNLOAD remote control command in REMOTE CONTROL COMMANDS MANUAL 2 1 3 2 Offset adjustment of the transducer The offset adjustment of the transducer done with the aid of the ZERO PHYSICAL or ZERO INTERNAL remote control command or with the FISOCommander software in the Config Transducer tab forces the data measurements of a given transducer to be equal to an arbitrary value immediately after it is activated The
34. optic transducers Ask your local representative for FISO Technologies specific Fiber optic Transducer Technical Note and Installation Guide such as our Fiber optic Strain Gage Installation Guide DMI OPERATING MANUAL 2 0 TRANSDUCER CONDITIONER 2 1 TRANSDUCERS 2 44 1 Principle of operation All the fiber optic transducers made by FISO Technologies are of interferometric type More specifically the sensing element of the transducers is a miniature Fabry P rot interferometer This sensing element is designed such that a stimulus i e the physical parameter being measured temperature pressure displacement etc produces a change in the cavity length Leni of the Fabry P rot interferometer Therefore the cavity length can be seen as the output signal of the fiber optic transducer The output stimulus relationship which establishes the dependence between the output of the transducer designated by Leavin and the stimulus designated by M is characterized by the following linear equation L SAM L cavity gt zero Where Sis the sensitivity of the transducer in nanometers per physical unit and LL Gage Zero is the output of the transducer when M 0 in nanometers The accurate factory calibration of the sensitivity S and of the Gage Zero L provides all the necessary information to calculate from the measurement of Leavin the true value of the stimulus M The measure of Leaviy is the basic principle used i
35. orce amp load or pressure transducer the conditioner will output a non zero value of M even though there is no physical or real stimulus applied on the transducer see equation 2 This situation will remain until the user redefines a new value of L In the case of the strain gage transducer the zero adjustment is usually done after bonding the transducer to the structure For pressure transducer of gage type the zero adjustment is done at atmospheric pressure or in vacuum See next section for absolute pressure The technical notes published by FISO Technologies for pressure and strain gage transducers provide more information on this subject The principal characteristics of the zero adjustment that should be reminded are The measurement of the cavity length L i performed during the zero adjustment function is done the same way as the data measurements see section 4 0 Thus parameters such as the Averaging Time will affect the results Obviously the value of the stimulus must be as stable as possible during the measurement of Lavin in order to make an accurate zero adjustment DMI OPERATING MANUAL A new value of L is redefined each time the zero adjustment function is activated The new value replaces the preceding one and becomes the current value of L To look for the current value of L use the ZERO DOWNLOAD REMOTE CONTROL COMMANDS MANUAL remote control command or go in the Config Transducer tab of the FiSOC
36. ot for one single wavelength as it is usually reported in the literature but is the refractive index averaged over the wavelength covered by the internal light source The light source extends from 650nm to 1000nm As a rule of thumb it is generally acceptable to consider that the refractive index is measured for a central wavelength of 800nm 27
37. patible with the AC voltage and frequency delivered at the power outlet Do not operate in wet damp conditions Do not operate in an explosive atmosphere Keep product surfaces clean and dry DISCLAIMER Information published in this manual is believed to be accurate and reliable However FISO Technologies assumes no responsibility for the use of such information FISO Technologies reserves the right to make revisions or changes to any parts of this manual or to the software described herein at any time without obligation to notify of these changes DMI OPERATING MANUAL WARRANTY INFORMATION FISO Technologies warrants the DMI conditioner sold has been made in good workmanlike and proper manner that it will perform according to the specifications if used in compliance with the guidelines provided that when shipped it will be in proper working order free from any defects in either workmanship or material and that for a period of one year from the date of delivery we will repair or replace without cost any part that may prove to be defective This warranty does not apply to the transducers sold for use with the DMI DMI OPERATING MANUAL CONTENTS SAFETY INFORMATION meu T i IMPORTANT SAFETY INSTRUC TIONS irren cnin aso nup raum nnn ahi nano rk an ERR iR Va ina an Ram RE RR RR RR SENE RARE SERA RR S i DISCLAIMER e i Warra
38. pe of the transducers as explained next Temperature Transducer the Gage Factor of the temperature transducer provides both the sensitivity S and the Gage Zero Lero Therefore the temperature transducer is fully calibrated and ready to use Strain Gage Transducer the Gage Factor of this transducer provides only the sensitivity S The Gage Zero is not included at the factory because it would have no physical meaning at this point Clearly the Gage Zero of the strain gage transducer has in general a real signification only when it is installed that is when it is bonded to the structure to be studied At first the DMI conditioner fixes the default value of the Gage Zero to zero Lero 0 nm However the zero and offset adjustment functions of the conditioner allow the user to automatically define at any time a new value of the Gage Zero for example after bonding the transducer See sections 2 1 3 1 and 2 1 3 2 Pressure Transducer the Gage Factor of this transducer provides only the sensitivity The Gage Zero is not included at the factory because in general these transducers are of gage type i e pressure measured relative to the ambient or atmospheric pressure At first the DMI conditioner fixes the default value of the Gage Zero to zero L 0 nm However the zero and offset adjustment functions of the conditioner allow the user to automatically define at any time a new value of the Gage Zero See sections 2 1 3 1 and 2 1 3 2
39. qual or close to the offset value Indeed if the value of the stimulus has not changed or very little since the offset adjustment its calculated value M from equation 2 must be equal or close to the offset value knowing that Loain Larn T s x offset value cavit B Offset with Internal Unit As opposed to the zero and physical units offset adjustment functions there is no measurement of Leaviry since the entered value is directly assigned to Lrs without any other calculation Using the ZERO INTERNAL ZP Offset value remote control command or with FISOCommander software lt lt INTERNAL gt gt button in the Config Transducer tab the offset value is entered in nternal Unit that is in nanometers 1 Immediately after receiving the ZERO INTERNAL ZP Offset value remote control command or after confirming your offset entry in the Internal dialog box of the FISOCommander software the conditioner assigns the entry to Ler and it becomes the new current value 2 At this point the new current value of L will affect the values of the data measurement according to equation 2 The offset adjustment with Internal Unit is generally used to re enter a given value of Le for example when the current value of L is accidentally erased from the conditioner memory or when the transducer is to be used with another conditioner This function can also be used to enter a calibrated value of LL as for absolute pressure transducers The
40. r to the Gage st 10 2 1 2 2 To assign the Gage Factors to the measuring channels 10 E See EE 11 2 1 3 1 Zero adjustment of the transducer ssesssssssssesee ene 12 2 1 3 2 Offset adjustment of the transducer enne 13 3 0 CONDITIONER REMOTE CONTROL eeeeeeeeeeeeeen enne nnne nennen nnne nnne nnns 15 3 1 FlSOCommander SoftWare eeeeeee ee eaae nana nana aa nana nana nu an aa aa 444444 RR RR aa aa NERA R4 0 RR RARE EREREE ananas 15 DMI OPERATING MANUAL 4 0 THE DATA MEASUREMENT amp ACQUISITION eese 16 4 1 Data sampling and averaging e eeeii eese ee esses ees n nn nn nana anna nnns hann asas anna anas a aa Pasa anna sana nana 16 e BE Wiper meum 16 C LECHE e ET Em 17 4 4 Data PCQUISI ON etm 17 4 4 1 eegene 17 4 4 2 Data Acquisition in Manual Geam ener nennen nnns tnter 17 4 4 3 Data Acquisition in Automatic Scan ssssssssssssssssseeeeeeen ene 18 4 4 4 Delayed Data Acquisition ssssssssssessssssees enne enne nint enne nn nns 22 4 4 4 1 Data Acquisition at set duration enne 22 4 4 4 2 Programmable Data Acquisition ssesssssssseeseeeerenneneen nennen 22 4 4 4 3 Data Logging and Downloading sse 23 4 4 4 4 Deleting the Memory Butter 24 4 4 5 Direct RE Ee TELE 24 44 6 Sleep RE 25 4 4 7 Low power state using system without hatten 26 APPEN
41. t22 1 Vn fer Line feed and carriage return CHO3 t22 5 n F characters C C C C The duration of the direct data acquisition set with the Acquisition Duration parameter can be adjusted only in the RS 232 TM2 mode The RS 232 SCAN TM8 mode is continuously running and stops with the TRIGGER TSO remote control command The other time based parameters of the direct data acquisition are the Averaging Time and the Acquisition Hate These acquisition setting parameters can be adjusted with the remote control commands ACQUISITION AVERAGE and ACQUISITION RATE respectively The direct data acquisition can be performed with the aid of FISOCommander software as well See Direct Acquisition tabs in the software 4 4 6 Sleep State Note the sleep state is irrelevant for NON BATTERY POWERED SYSTEM When it goes in Sleep State the DMI signal conditioner turns off most of its hardware so to reduce its power consumption By doing so the system will preserve the battery power If the user wants to communicate with the DMI while in Sleep State a wake up signal must be send first to the DMI 25 DMI OPERATING MANUAL This can be done by three different ways pushing once the ON OFF button sending a string character via the RS 232 link or by way of modem communication i e calling the DMI internal modem section 1 4 4 The red LED off with the green LED on the front panel indicates that the DMI is in the Sleep State This state m
42. ta measurement is thereafter available for memory storage or outputting to the RS 232 or modem port depending on the Acquisition Mode selected 4 During data acquisition see section 4 4 the three preceding steps will be repeated at every interval of time given by the Acquisition Rate if manual scan mode is selected If the automatic scan mode is selected the conditioner will first switch to the next channel and repeat the preceding steps The complete scan of the channels will be repeated at every interval of time given by the Acquisition Rate See section 4 4 the timing diagrams of Figure 2 and Figure 3 for more information The Averaging Time is set with the ACQUISITION AVERAGE remote control command or in the Config Conditioner tab of FISOCommander software The minimum value of the Averaging Time is 0 05 second where in this case there is no averaging since the data measurement is obtained from one data reading To calculate the number of data readings that is used to produce one data measurement simply multiply the Averaging Time by 20 Hz The Acquisition Rate is set with the ACQUISITION RATE remote control command or in the Config Conditioner tab of FiSOCommander software The meaning and permitted values of Acquisition Rate depends of the scanning mode see sections 4 4 2 4 4 3 Figure 2 and Figure 3 The default value of Averaging Time for the DMI Long Range version is factory preset at 1 0 second and should not be decreased
43. ter it is activated This is achieved with the aid of the ZERO PHYSICAL remote control command REMOTE CONTROL COMMANDS MANUAL or with the FlSOCommander software lt lt NULL gt gt button in the Config Transducer tab The operating principle of this function is described next 1 Immediately after receiving the ZERO PHYSICAL ZO0 remote control command or after pressing the lt lt NULL gt gt button in the Config Transducer tab of the FiSOCommander software the conditioner performs a measurement of Lu of the transducer Thereafter the conditioner assigns this value of Leavity to Lzero that iS Leavity gt Lu At this point one could see that the values of the data measurement taken right after the zero adjustment are equal or close to zero Indeed if the value of the stimulus has not changed or very little since the zero adjustment its calculated value M from equation 2 must be equal or close to zero knowing that Leavin Lzero The zero adjustment function allows the user to specify or select the physical conditions at which the calculated value of the stimuli M must equal zero It should be emphasized at this point that 1 FISO Technologies transducers are made and delivered with an initial cavity length Leaviy not equal to zero 2 Except for temperature and displacement transducers the default value of the Gage Zero of the transducers is set to zero Leo 0 nm Consequently when using for the first time the strain gage f
44. the data measurements directly from your PC computer see section 3 1 using either an RS 232 or modem connection 1 4 4 Modem connection The DMI is equipped with a V 90 standard internal modem that allows the user to remotely control the DMI through a telephone connection The internal modem supports communication speed from 300 bps to 56 kbps To use the modem communication simply connect the DMI to your telephone line using a standard RJ 11 to RJ 11 cable The DMI internal modem answers automatically immediately after receiving the second telephone ring signal even if the DMI is off or in Sleep State Indeed the modem automatically turns on the DMI Once connected via the internal modem the remote operation of the DMI is the same as with an RS 232 link After the remote user hangs up the internal modem needs approximately one minute to shut off itself after which 15 minutes later the DMI will turn off or goes back in Sleep State The FISOCommander software can be used with a modem connection Simply select in FISOCommander software the COM port on which the computer modem is installed and the modem initialization window will pop up Enter the telephone number For long distance call it may be necessary to enter pauses in the dialing sequence of numbers The easiest way to accomplish this is by using the standard modem dialing string character which causes dialing to pause for each occurrence ex 1 222 111 3333 When ready cli
45. the next point if you are using temperature probes only The zero adjustment forces the reading of the transducer to be equal to zero immediately after it is activated The zero adjustment of the transducer is necessary when using for the first time a strain gage force amp load refractive index or a pressure transducer The zero adjustment function is automatically disabled in case of a temperature transducer See section 2 1 3 for more details To zero adjust a selected transducer with the FISOCommander software click on the NULL button in the Config Transducer tab 5 First acquisition and graphical display From this point your DMI signal conditioner is ready to display the data measurements taken with the fiber optic transducers For this purpose we recommend the step by step procedure describe in the FISOCommander software user s manual DMI OPERATING MANUAL 1 4 OPERATING FUNCTIONALITIES 1 4 1 Power supply and external battery operation The DMI conditioner comes with a wall plug in or tabletop power u supply battery charger and with an external battery already connected to the External battery conditioner The battery is located inside the NEMA enclosure The former is used to power the conditioner and recharge the external battery The allowed power supply DC operating voltage is 9 to 15 Volts with a minimum current capacity of 500 mA The external battery is a 6 Volts 4 5 A hour capacity The operating temperat
46. tioner switches to channel no 2 and performs the same steps These steps are repeated for each channel until the end of the scanning cycle total duration of 64 seconds including stabilization period of 0 1 second per channel that is at channel no 32 This cycling process is repeated at every interval of time given by the Acquisition Rate that is 56 seconds after the last data measurement taken on the channel no 32 The lowest possible value of the Acquisition Rate is equal to the Scanning Time multiply by the number of activated channels that is the time of a scanning cycle If the user tries to enter a lower value the Acquisition Rate will be automatically reset at the start of the Acquisition Session to this limiting value 19 DMI OPERATING MANUAL TABLE 2 ACQUISITION MODES See ACQUISITION MODE command in REMOTE CONTROL COMMANDS MANUAL OTHER SPECIFIC SCAN ACTIVATION START STOP NAVE COMMAND MODE DATA STORAGE DEACTIVATION PARAMETER PARAMETER PARAMETERS AND FEATURES None Aca sition D A ing Ti NORMAL TM Manual Yes TSi TSo conmands Starts irrrrediately iua iMd en s de ne activation or deactivation Acquisition Rate None si data SINGLE M Manual Yes TSi TSo commands Starts intrediately singe Averaging Tire after activation None DES Averaging Tine RS 232 TM Manual no TSi TSo conmmands Starts intrediately Ter il Acquisition Rate Direct acquisition G
47. udes a four line header and the data measurements taken during the duration of the Acquisition Session First line of the header contains the Acquisition Series number the value of the Acquisition Rate the value of the Averaging Time the date of the Acquisition Session the time at which the Acquisition Session was started and the system of Units The Acquisition Series number indicates the chronological order of the Acquisition Session i e 1 is the first Acquisition Session 2 is the second Acquisition Session etc The second line of the header indicates the channel numbers from which the data measurements are taken Each channel number defines a row under which is written the Gage Name third line of the header followed by the Gage Factor fourth line of the header and then next by the data measurements each line of data corresponding to a scanning cycle if in automatic scan mode Use the LIST TAG LT command or FISOCommander software to get a listing of all the Acquisition Series stored in the memory buffer without the data measurements FIGURE 4 shows an example of the content of an Acquisition Series file 23 DMI OPERATING MANUAL FIGURE 4 CONTENT OF THE ACQUISITION SERIES FILE This example shows the acquisition made on channel 1 to 4 Acquisition Session no 3 Acquisition Rate 4 0 second Averaging Time Starting date of the Starting time of the 1 4 second Acquisition Session Acquisition Session System of Units Mz
48. ure is from 0 C to 40 C The external battery is mainly used as a back up power supply during a shutdown of the external power It can also be used as a main power supply in remote location where no external power is available In the later case the DMI autonomy depends of course on the remaining charge in the battery but it also depends on the operating conditions of the DMI The next table provides information about the DMI autonomy during battering operation for different type of operating conditions DMI AUTONOMY DURING BATTERY OPERATION 25 C BATTERY FULLY CHARGED DATA ACQUISITION CONDITIONS DMI AUTONOMY Data acquisition of 32 channels with maximum speed of data 12 hours measurements no averaging Data acquisition of 32 channels with data acquisition rate of 5 data 350 hours measurements no averaging per hour and per channel Data acquisition of 32 channels with data acquisition rate of 1 data 900 hours measurements no averaging every 6 hours and per channel 1 4 1 1 External battery lifetime cyclic and standby use The battery lifetime that is the maximum number of charge discharge cycles before the external battery lose most of its retention capacity and must be replaced depends on the capacity taken from the external battery The following table gives the battery lifetime as a function of the depth of discharge of the battery Depth of discharge Number of cycles 100 200 to 300 0 standby use
49. when using transducer with long length of fiber optic cable Whenever it is possible it is recommended to set the Averaging Time to a value larger or at least equal to 1 0 second 4 2 AUTOMATIC SCAN The measuring channels of the DMI conditioner can be scanned in two ways automatic and manual scan The scanning method is selected by mean of the Acquisition Modes See section 4 4 1 When set to automatic scan mode the data measurements are sequentially taken on each of the activated DMI channels The conditioner switches from one active channel to the next active one in ascending order ex channel no 1 523 4 This scanning cycle is continuously repeated 12593o45 21222 DMI OPERATING MANUAL The Scanning Time is defined as the time required for switching to a channel a get a data measurement of that channel This time varies with the Averaging Time and with a stabilization time fixed at 0 1 second Note The stabilization time is fixed at 0 4 seconds for a DMI Long Range version Scanning Time Averaging Time 0 1 second seconds channel 3 The smallest and default value of the Scanning Time is 0 15 second channel that is when the Averaging Time is set to its minimum value of 0 05 second It should be emphasized that the conditioner skips the deactivated channels i e channels turned OFF Consequently it is recommended to set the non used channels to OFF to minimize the time required for a complete scan of the c
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