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User manual PICAS

1. Phase 5 KHz exc ref EX The Controller board Analog Excitation Analog anplifiers reference signals controls 1234 The blockdiagram shows the basic elements of the central processor module M ltiplexer Further hardware components Apart from the basic module the PICAS cabinet further houses the power supply the LCD display module the front with integrated pushbuttons and a backpanel with various input and output connectors USB RS232 RS485 Vin Frontpaneel Unstab pesos UDODDUDODBDBUODOD Page 6 of 59 Peekel Instruments User manual PICAS V2 6 1 2 Connecting the instrument 2 1 Carrier frequency inputs on CA2CF The following pages show examples of the various options of how to connect various input signals and transducers to the instrument Later in this document further details are given of how to actually measure these signals 2 1 1 Connecting the Transducers The carrier frequency amplifier is mainly used for straingauges and lvdt s They are connected in full half or quarter Wheatstonebridge configurations having 4 2 or 1 external straingauges resistors inductances or capacities respectively The other arms of the bridge can be completed with the internal on board 1 2 and 4 bridge complementary resistors As a standard these are 240 Q for 1 2 bridge and 120 Q for 1 4 bridge The precise value for a half bridge completion is not important as long as the
2. 42 dB Octave 0 1 10 Hz 2 3 or 4 wire configuratieons 5V 0 1 max 50 mA Maximum for 4 channels together is 100 mA 1mAz 5 max 7 5kQ 24VDC max 80mA galvanic separated from inputs Page 58 of 59 Peekel Instruments Input Measurement range Voltage Current Resistor Temperature Input filter 3 dB Filter type Input resistance Max input voltage Max input current only is current mode Common Mode voltage User manual PICAS V2 6 1 20 mV 10V 5 mA 100 mA 1002 75000 PT100 200 590 C PT1000 200 590 C Type B 250 1820 C Type E 200 1000 C Type y 200 1200 C Type K 200 1370 C Type N 200 1300 C TypeR 50 1760 C Type S 50 1760 C TypeT 50 390 C Cold Junction Compensation with a PT100 on channel 1 of the CA4Al card 10 Hz 2 pole low pass Butter worth 10 MQ 35V 120 mA 12V un t The CA4AI board does not have an analog output for each input channel Controller Boards PB6000 PB6100 A D converter 16 Bit Amplifier calibration per Software and D A converter Synchronization of carrier frequency digital with other PICAS units Interfaces 1x RS232 1x RS485 1x USB V1 1 Digital outputs solid state switch for trip generation max 48VAC DC 300mA Max total conversion speed 100 Hz 20 000Hz Measurement value storage 29 000 values 500 000 valu
3. GENERAL channel menu and can be set by pressing the ENTER key This will move the Page 27 of 59 Peekel Instruments User manual PICAS V2 6 1 cursor to the right and makes it a small edit underline character Then the numbered keys the decimal dot the key and or the exponent keys can be used to type the required value The EXP and EXP gt keys switch the value suffix or the physical unit suffix between p n 1 m none k M Gand T for micro milli none kilo mega giga en tera Use ENTER to accept this edited value or CANCEL to restore the previous value Notice that when channel information is shown at the bottom left of the screen a measurement of the amplifier output voltage is shown This enables directly viewing the effect of the settings on the amplifier status Page 28 of 59 Peekel Instruments User manual PICAS V2 6 1 3 4 Measuring Display To display the measurement values PICAS has 4 display layouts Actual the actual value of the selected channel will be presented on the PICAS display in a large font Peak values the low and high peak values of each channel will be presented on the display Sum amp Diff the sum and difference value of channel 1 amp 2 and channel 3 amp 4 will be presented on the display Bar graph for each channel a bar graph is presented on the display The actual value is presented as a level in the bar graph The actual values are also presented in numbers if there is room o
4. O 27 3 4 M asuring Display PC 29 3 4 1 Act al value display tiere teer ted eerte Rte i 29 3 4 2 Peak value display ini iaia A Ren 30 3 4 3 Sum difference value display i 31 3 4 4 Bar graph value display iii 31 3 5 System MeNU Si EE 32 3 5 1 System menu GENERAL ica vata dente e Ic Es etre te T eee etg 34 3 5 2 System menu Communication iii 35 3 5 3 System menu ACTORS toes do mr e ect te e die n 36 3 5 4 System menu Memory sssssssssssssesses esent nee nennt nnns en nnn nennen enne sen trt senten nennt nnns 37 Page 2 of 59 Peekel Instruments User manual PICAS V2 6 1 System menu Measuring Parameters i 38 System menu Datalog i 39 System menu PaSSWord inneren nnns enne nnns entrent nnne 41 GAGE Channel Menu Sic ira ira eot mei vetet on beer O E alti rat 42 GA 2GF men GENERAL tete od eiie ete neue meted ee aban beets en 43 GAPGF menu SENSQR iii e eee eee tt 45 GA2GE menu STRAIN iius tta teet tr 46 CA2CF menu RANGE ee nneneennn ennt thitis sss sns n n sins s tnnt ass s n sess sss dass nna 47 CA2CF menu BALANCE e ehmhhenennnnnnnRhneni sss ssn nn tins spes ss ssp n a ess sss sss s nna 48 CGA2GE menti TRIBS ii tcr ree ed este Asian ee bas eis Se a isa 49 CAAAI channel menu s a a sss ss nnn lise sess sss n a aain 50 GA4AI menu GENERAL ein
5. The values will only be updated when the complete menu is updated To set the date time just enter the actual value and the instruments will active this date time when entered Page 37 of 59 Peekel Instruments User manual PICAS V2 6 1 On the last line a password can be entered When the correct password is entered the selection of the action Store Setup will be possible When the password is set at O this last 3 5 5 System menu Measuring Parameters This menu sets the presentation mode of the local display DEVICE 1 PRESENTATION AMPLIF Vout SYSTEM DISP TIME S 40 5 DISPLAY Actual MENU RESET PEAK Execute MEAS PARMS PEAK OPTION Hold Controls and Functions Presentation selectable Signal V V Physic Unit Output V Disp Time s adjustable 0 1 45 0 Display selectable Actual Peak values Sum amp Diff Bargraph Reset peak execute Peak option selectable Hold Runn Functional description The presentation parameter defines how measurements are presented on the display When set to amplif Vout the value represents the output voltage of the amplifier When set to amplifier the value represents the input signal of the amplifier in V V volts per volt When set to physic unit the display shows the physical unit as chosen in Channel Menu 4 Range with the range of parameter In that case the presentation can be either with the sensor unit the straingauge unit or again the amplifier
6. hence you can have the instrument execute that action by selecting the second line and pressing ENTER With Source Chan you can select any one of 4 channels from which to copy parameters Channel 1 Channel 4 can be set to YES or NO to instruct if such channel is taking part in the centralized ACTION ACTION Description Calibration When this command is given the bridge supply will be calibrated with the use of the sense lines Copy Params Copies the parameter from the source channel to the selected channel Auto Balance Performs an auto balance action to all selected channels Disable Bal Switches OFF the use of the balance function for the selected channels Use Balance Switches ON the use of the balance function for the selected channels Page 36 of 59 Peekel Instruments User manual PICAS V2 6 1 3 5 4 System menu Memory This menu allows storage of all 4 amplifier settings and system settings DEVICE 1 CHOOSE ACTION STORE SETUP SYSTEM SCOPE CHANNELS CHANNEL SETUP 1 MENU ACTION execute MEMORY DATE 27 11 03 TIME 13 45 23 Password Controls and Functions Choose Action selectable Store Setup Get Default Get Setup Scope selectable Channels System Chan System Channel selectable Setup 1 Setup 4 Action lt execute gt Date editable current date day month year Time editable current time hour minute seconds Password editable always displayed with characters These it
7. when entering data plus or minus when entering data Shortcut to System menu MEAS PARMS scroll downward through exponents or engineering unit suffixes when entering data Shortcut to measuring display large figures scroll upward through exponents or engineering unit suffixes when entering data Page 26 of 59 Peekel Instruments User manual PICAS V2 6 1 General At the LCD screen three different groups of displays can be shown SYSTEM menu s CHANNEL menus MEASURE display With the SYSTEM menus the various settings of a DEVICE can be set With the CHANNEL menu s the behavior of each of the CHANNELS of a DEVICE can be set The MEASURE display is generally used when actually measuring It shows 1 selected channel in large figures and all other channel outputs of a DEVICE selected in small figures For the SYSTEM and CHANNEL menu s the LCD screen is divided in 3 columns At the left are the various menu names device and channel number as selected by the pushbuttons In the middle are the specific functions which belong to the menu chosen and at the right are the individual settings fields Some fields can be chosen or set by the user some cannot be changed and are dictated by the system The upper left portion of the display shows the device as chosen by the DEVICE pushbutton With only one device in use one PICAS instrument this will always show 1 If more PICAS instruments are connected to the RS 48
8. K FACTOR CHANNEL 1 BRIDGE FACTOR USE E MODUL E MODULUS E MOD UNIT Controls and Functions K Factor adjustable Bridge Fact adjustable Use E Modul selectable No Yes E Modulus adjustable 1 0000 10 000 and selectable pico gt gt gt Tera E Mod unit fixed N mm Functional Description The k factor can be copied from the datasheet of the manufacturer of the strain gauges The bridge factor is basically equal to the number of active strain gauges in the bridge If applicable it can also be used for the correction of Poisson effects in strain gauges configurations When using half and quarter ridge configurations be sure to connect the internal bridge completion resistors through the bridge connector These built in bridge completion resistors are 120 Q for 1 4 bridge completion and 2 x 240 Q for 1 2 bridge completion see page 5 The above parameters allow calculation of the signal into the strain unit m m If further calculations are to be done to obtain the stress in the material the e modulus parameters may be set Set the use e modul line to yes and set the e modulus unit and value as appropriate for the material to be tested Page 46 of 59 Peekel Instruments User manual PICAS V2 6 1 3 6 4 CA2CF menu RANGE By this menu the amplifier can be set to a certain measurement range DEVICE 1 RANGEOF Signal V V CHANNEL 1 RANGE UNIT MENU Output V RANGE 0 0577 V Controls a
9. Ta I I li I bag I Fog I I ry 1 I I I bog I I I I I I I I I I I I I I I I I I I I Fog V c I I I I lx 1 A I ya I tia I Fog I I I Pa I I X I I I I I Ur V 4 to chassis 4 9 6 Figure 15 4 20 mA Sensor connection note make sure that the sensor can handle the 24VDC supply Page 17 of 59 Peekel Instruments User manual PICAS V2 6 1 2 2 6 Connection of a 0 20mA Sensor Connection of a current sensor 0 20 mA or 4 20mA when the sensor power supply from PICAS is not used to chassis Q 6 Figure 16 0 20 mA Sensor connection 2 2 7 Connection of a Thermocouple element A thermocouple element is connected like a voltage signal For the compensation of the cold junction at the screw terminals the first channel of the CA4AI card is used With this channel the temperature of the junction must be measured with a PT100 element A i il tt i pa tot tot tot I I I tot tot tot tou tot tot tol tol va Vt NI Vl iui M to chassis 0 6 Figure 17 Thermocouple connection Page 18 of 59 Peekel Instruments User manual PICAS V2 6 1 2 3 Outputs 2 3 1 Combined analog output pin 1 Amplifier output 1 v Seen against pin2 Amplifier output 2 Ouiput s 7 female pin3 Amplifier output 3 Amplifier 1 10 1 pin4 Amplifier output 4 Amplifier 2 20 pind Screen gnd Apinae de pin d
10. at the amplifier input In the shown example a load cell is specified that gives 1 mV V signal if a force of 10000 Newton is applied These values can often be read from the datasheet and represent mostly full load signals But the values in the sensor menu can also be obtained from in house calibration and they do not necessarily have to be full load signals If you have measured and know that your 10kN load cell produces 0 83mV V if 8 3kN is applied those values would do the job as well The parameter physic unit specifies the physical unit of the sensor A load cell could have tor Nas unit and an lvdt could have m meter as in centimeter millimeter as unit The sensor calibration can automatically be done with this menu First the sensor must be placed in a zero position condition Now the Auto Balance command must be give After this the measured value will be at zero AT this time the sensor must be placed in a known position situation for example at a load cell 8 3kN is applied Now the meas sensor command is given The input signal level is measured and the sensor sensitivity is calculated and presented on the display at the line sensor v v Page 45 of 59 Peekel Instruments User manual PICAS V2 6 1 3 6 3 CA2CF menu STRAIN This menu is specifically intended for using with experimental strain gauge measurements If you measure a complete sensor like a load cell or an LVDT it is easier to use the sensor menu number 2 DEVICE 1
11. gt 410 000 with pico Tera 10 000 gt gt gt 10 000 with pico Tera When the range information of a sensor is known this information can be entered in this menu At the fields Sensor max and Sensor min the physical limits of the sensor are entered At the field Signal max and Signal min the electrical signal values belonging to the mentioned physical limits are entered PICAS will now calculate the correct physical value from each measured signal value Page 52 of 59 Peekel Instruments 3 7 3 CA4Al menu Range Controls and Functions Functional Description Device 1 Channel 3 Menu Range 00 006 V Range of Range Unit Range of Range Unit selectable selectable Meas value 10V V User manual PICAS V2 6 1 Signal V V Sensor see table below provided by system The selection of Range of selection will influence the presentation of the measured value in physical units When Sensor is selected the displayed value will be in the units entered in the Sensor menu The selection of the Range value depends on the type of measurement selected in the General menu and are Voltage Current Resistor Temperature measurement 10V 100mA 4000 Q PT100 200 590 C 5V 50 mA 2000 Q PT1000 200 590 C 2V 10 mA 500 Q Type B 250 1820 C 0 5 V 5 MA 100 Q Type E 200 1000 C 0 1V Typ eJ 200 1200
12. iue pu 09 Signal Ground pin7 roun J ping Ground i pin9 Ground Through these connections all 4 outputs 0 10 V are continuously available They might be used for connecting an external multiplexer or other device Cable screen should be connected to the connector case Do not connect to pin 5 Individual analog outputs For each Carrier frequency channel the same output voltage 0 10 V is also available on a BNC connectors at the rear of the cabinet Note The Channels from the CA4Al card do not have an analog output Not on the board itself and not on this combined analog output connector 2 3 2 Digital Outputs O Connection diagram for Pin 1 4 de Seen against channel 1 The other channels are chi 20 mae contac identical just use other pins AC or DC Ch2 30 ch 2 40 max 48V Ch3 50 PET Ch 3 60 Ch 4 70 Pin 2 Ch4 80 Imax 300 mA Ve 2 3 3 Digital Inputs Imp dopu O O A Sat On the same connector 2 digital inputs are present These inputs are connected through 5 24VDC optocouplers to the processor Pin 10 Pin 11 Imax mA Page 19 of 59 Peekel Instruments User manual PICAS V2 6 1 2 4 Communication ports 2 4 4 RS232 interface This port can be used to connect a COM port of a PC The Baudrate can be selected with System Menu 02 pin 1 N pin2 RXD C pins TXD 5m d pin4 Ground 5 N Seen against pin5 Ground c male c
13. measurement speed can not be matched a message Datalog speed too high will be displayed and the measurement will not start PB6000 The device can perform up to 100 measurements per second PB6100 The device can perform up to 10000 measurement per second Up to 20000 measurement per second can be achieved when all the channel intervals are the same This setting can only be done using a PC with the appropriated software It is possible to filter the storage of measurement values based on digital inputs or trips When the Logfilter option is set to a digital input logging will only be performed when the input is activated The display shows armed while logging is active without the input being active no measurement values are stored and logging when the input is active When the Logfilter option is set to an active trip on a channel logging will only be performed when the channel is tripped Page 40 of 59 Peekel Instruments User manual PICAS V2 6 1 3 5 7 System menu Password This menu is only available when the PB6100 controller is in use In this menu a password can be entered to protect the instrument settings in nonvolatile memory to be overwritten When the correct password is entered the command to store the settings is available When the used has logged off the settings can be altered but cannot be stored DEVICE 1 Password kx SYSTEM Set password execute Log off execute MENU Password Co
14. signal in V V The value disp time s indicates the display update time interval Depending on the time chosen the instrument calculates the average value of the number of actually measured values in that time This average time is only used when the channel value is displayed in a large font and by the calculation of the trip values The setting of Display will influence the presentation Actual the actual value of the selected channel will be presented on the PICAS display in a large font Peak values the low and high peak values of each channel will be presented on the display Sum amp Diff the sum and difference value of channel 1 amp 2 and channel 3 amp 4 will be presented on the display Bar graph for each channel a bar graph is presented on the display The actual value is presented as a level in the bar graph The actual values are also presented in numbers if there is room on the display When PICAS is in measuring mode the presentation can be changed with the enter key Page 38 of 59 Peekel Instruments User manual PICAS V2 6 1 3 5 6 System menu Datalog This menu is only available on devices where the datalog option is enabled It allows the user to perform a measurement and store measurement data in the internal memory of the device The memory will retain the data for 48 hours after switching the device off or unplugging it from its power source The data can be retrieved from the device at a later time using a PC and
15. the Signasoft 6000 software The differences in this function between the PB6000 and PB6100 controller are mentioned in the text DEVICE 1 DATALOGGING INACTIVE SYSTEM LOGFILTER Off CLEAR BUFFER execute MENU FACTOR 10 msec DATALOG CHANNEL 1 0 096 CHANNEL 2 CHANNEL 3 Controls and Functions Datalogging selectable Inactive Cyclic Log Log amp Fill RAM Logfilter selectable Off Dig Input 1 Dig Input 2 Trip Ch 1 Clear Buffer execute for the PB6000 controller Factor selectable 10 msec 1 sec Channel 1 editable 000 250 Channel 2 editable 000 250 Channel 3 editable 000 250 Channel 4 editable 000 250 for the PB6100 controller Factor selectable 100usec 1 sec Channel 1 editable X interval time see text Channel 2 editable X interval time see text Channel 3 editable X interval time see text Channel 4 editable X interval time see text Functional Description To store a measurement in RAM the buffer must be empty The device can not store several different measurements in RAM Select the clear buffer function and press ENTER to remove previous measurement data Beware once the buffer has been cleared the measurement data can not be recovered To configure a measurement the measurement interval must be configured for all channels The interval for all channels can be selected in steps PB6000 the selectable steps are 10 msec or 1 second For each channel a numb
16. the operational mode for Channel 1 Menu 1 The instrument has to be switched on for at least 15 minutes before the instrument will operate within the specified accuracy 3 1 2 Presentation of numbers Throughout the channel settings floating point numbers are used They are internally stored as 4 bytes and can take very small and very large values They are generally shown in the format 41 2345 or 412 345 or 4123 45 where the plus sign might be replaced by the minus sign As an example values smaller than 1 0000 will be shown as 4123 45 m where m stands for milli or 1 1000 Remember also that 123 45mV for example is the same as 0 12345V The m can be understood as a prefix to the physical unit V in this case but can also be thought of as a suffix to the value 123 45 in this case PICAS always presents its floating point numbers using the suffixes p n u m none k M G and T standing for pico nano micro milli none kilo Mega Giga and Tera A value of 825 0 uV V is for example the same as 0 825 mV V On the other side values larger than 999 99 will be shown for example as 1 2345 k where k stands for kilo or 1000 Note that there are 2 keys on the frontpanel EXP and EXP that easily toggle the discussed suffix while editing a number 3 1 3 Conventions In this manual the following conventions are being used Any line in a menu shall firstly be selected by putting the cursor in front of it using the UP DOW
17. voltage OV pin6 Screen Ground Pin 1 is on the left side of each terminal when one is looking at the rear site of PICAS to chassis 0 6 Figure 11 Interne connection of the analog input Connection pinout of the Power terminal pini 24VDC pin2 24VDC Pin 1 is on the left side of each terminal when one is looking at the rear site of PICAS 9 2 Figure 12 Interne connection of the 24VDC supply This power supply can deliver 80 mA maximum and is galvanic isolated from PICAS Page 15 of 59 Peekel Instruments User manual PICAS V2 6 1 2 2 2 Potentiometer connection screen end Q 6 Figure 13 Potentiometer connection 2 2 3 Connection of a resistor sensor like a PT100 screen end 0 6 gt Figure 14 Resistor connection This connection diagram is used with a PT100 sensor Page 16 of 59 Peekel Instruments User manual PICAS V2 6 1 2 2 4 Connection of a voltage signal A voltage signal is directly connected to the signal input terminals of the channel to chassis 0 6 Figure 17 Voltage signal connection 2 2 5 Connection of a 4 20 mA Sensor Normally these sensors will deliver a 4 mA signal when the measured signal is at minimal level This 4 mA signal is also used as a power supply for the sensor In this case a 2 wire connection to the sensor is used The 24VDC supply can be used for these sensors f n I I Active 4 20 mA sensor
18. with a variety of Wheatstone bridge based sensors PICAS can hold 2 input cards These input cards can be the CA2CF or CAAAI cards The CA2CF card comprises 2 high accurate galvanic isolated carrier frequency amplifier channels each with its own analog output On these channels a variety of resistive straingauge configurations can be connected for experimental materials testing Also Load cells can be connected for industrial weighing and force measurements L VDT s Linear Variable Differential Transformers can be used for measuring linear or angular displacements and also Capacitive Transducers can be connected The CAAAI card comprises 4 input channels for voltage current or resistor measurements PICAS contains a control board which comprises a microprocessor which controls the amplifier settings keyboard and display handling and the communication to external systems through the serial communication channels 1 3 The Carrier Frequency principle High accuracy measuring at the output of passive transducers is usually configured into some sort of a Wheatstone Bridge circuit which always needs some form of reference bridge supply voltage DC bridge supply is by far the most popular for resistive transducers but when it comes to the highest sensitivity DC might introduce different spurious voltages which makes the measuring unreliable In the late 50 s PEEKEL already developed the Carrier Frequency principle for these applications where an
19. 5 bus these other DEVICES can be selected and displayed The next line shows the selected channel Each one of the 4 channels is selected with the CHANNEL button The third line the first in the next box shows the active menu followed by the name of that menu in the next line The menu of your choice is selected with the MENU button This will bring you through all settings for the selected channel A quicker method is to use one of the short cut keys 1 6 of the lower row of 14 pushbuttons These will bring you directly to a specific channel menu The names of these menus are also printed on these keys The keys ACTIONS MEMORY SYSTEM and set SET MEAS will bring you directly to one of the system menu Use the up down keys to go to the required line indicated by a black cursor in front of the name of that field in the middle column 3 3 2 Fields The column at the right of the LCD display largest area shows the fields with the parameters settings of the currently selected menu Selectable fields which represent a pre defined choice like LANGUAGE in the GENERAL system menu can be modified with the left right keys Fields which represent actions like CALIBRATION in the GENERAL channel menu can be activated by pushing the ENTER key Such a field shows execute and switches temporarily to wait during when the action is being executed Adjustable fields require manually introduced numbers like BRIDGE VOLT in the
20. AC voltage is being used for the supply which eliminates most of these spurious and misleading signals Furthermore AC bridge supply can be also used together with capacitive and inductive transducers If dynamic signals are being measured the AC bridge supply voltage will be modulated by the measuring signal and by detecting this signal the output signal becomes available This way of measuring through modulation of a carrier frequency with detection in a later step is similar to the principle of AM radio Hence the term Carrier Frequency is being used The inherent use of isolation transformers assures a complete isolation between the sensing circuit and the rest of the system Page 5 of 59 Peekel Instruments User manual PICAS V2 6 1 1 4 General design principles The following drawings only show the basic principles of the carrier frequency amplifier as itis outside the scope of this user s manual to go in full detail Basically PICAS houses 1 controller board which controls the settings of the amplifiers as well as the communication with external devices like a PC Also PICAS can hold up to 2 input cards of the type CA2CF or CA4AI or a mix of those cards The carrier frequency Amplifiers The drawing shows the evident advantage the two transformers fully isolating the measuring input from the 125 uV V 1V V ZERO 9pM vd Input rest of the system Dsub Control PA Bridge completion 2400 2402
21. C 50 mV Type K 200 1370 C 20 mV Type N 200 1300 C Type R 50 1760 C Type S 50 1760 C Type T 50 390 C Page 53 of 59 Peekel Instruments 3 7 4 CA4AI menu Tara Device 1 Channel 3 Menu Tare 00 006 V Controls and Functions Auto Tare Tare Unit Use Tare Functional Description Auto Tare Tare Unit Use Tare execute execute 10 0 V Yes provided by system or adjustable User manual PICAS V2 6 1 100 0 100 0 and selectable pico milli provided by system selectable Yes No When a measured signal is at zero level this command can be given The presented value will be corrected by the value displayed at the Tare line This correction is activated by the Auto Tare command The balance values are displayed and entered in the unit displayed in this menu The unit value cannot be changed in this menu Page 54 of 59 Peekel Instruments User manual PICAS V2 6 1 3 7 5 CA4Al menu Trips Device 1 Trip value 0 0 Channel 3 Hysteresis 0 0 Unit N Menu Trips 00 006 V Trip control Inactive Act period 9 Controls and Functions Trip Value editable 0000000 999999 Hysteresis editable 0000000 999999 Unit provided by system Trip Control selectable unactive high signal low signal Act Time selectable 0 100 ms 200 ms 60 m Functional Descripti
22. ENU TRIPS 30 0577 V BRIDGE VOLT SIGNAL MODE POLARITY CALIBRATION BRIDGE LOAD BRIDGE COMPL PRESENTATION SENSOR RANGE PHYSIC UNIT SENSOR V V MEAS SENSOR K FACTOR BRIDGE FACTOR USE E MODUL E MODULUS E MOD UNIT RANGE OF RANGE UNIT AMPLIF Vout AUTO BALANCE R BALANCE C BALANCE UNIT USE BALANCE TRIP VALUE HYSTERESIS UNIT TRIP CONTROL ACT PERIOD Page 42 of 59 5 0 NORMAL NORMAL lt execute gt 120 0 1 1 BRIDGE Default 10 0 k N 1 0 m lt execute gt 2 0 4 0 NO 200 0 k N mm Signal V V 1 0m VIV 10 0 lt execute gt 0 0 0 0 VIV YES 890 2k kN HIGH SIGNAL 200 ms Peekel Instruments User manual PICAS V2 6 1 3 6 1 CA2CF menu GENERAL DEVICE 1 BRIDGE VOLT 450 CHANNEL 1 SIGNAL MODE NORMAL POLARITY NORMAL MENU CALIBRATION zexecute 40 0577 V BRIDGE COMPL 1 1 BRIDGE PRESENTATION pefault Controls and Functions Bridge Volt adjustable 0 5 5 volts Signal Mode selectable Normal Capacitive Polarity selectable Normal Inverted Calibration lt execute gt Bridge Load adjustable 60 0 gt gt gt 3000 Q Bridge compl Selectable 1 1 Ya 14 1200 or 1 4 3500 Presentation selectable default Output V Signal V V Physical unit Functional Description The first line bridge volt defines the excitation voltage of the transducer or straingauges Values from 0 5 5 volt are poss
23. N buttons After this the following controls may be used adjustable means that a value can be entered and edited by using the keyboard To start editing push ENTER To leave this mode push ENTER again selectable means that a choice can be made from a pre defined list of expressions etc which can be scrolled by using the LEFT RIGHT buttons adjustable and selectable means that after adjusting the numerical value the suffix can be selected with the UP DOWN buttons execute means that a command can be given by pressing the ENTER button after which the required command is then being executed Page 24 of 59 Peekel Instruments User manual PICAS V2 6 1 3 1 4 Settings Protection When the device is completely configured the settings can be stored in nonvolatile memory When the same settings are needed again at a later time they can simple be loaded from this memory In total 4 of these memory locations are available In order to prevent that the settings are accidentally overwritten it is possible to setup a password protection in the instrument This will disable the storage of the settings in the nonvolatile memory All the settings are free to be changed just the storage is prohibit When the instrument is delivered the password is set to 00000 With this password the protection is off There are 3 modes in which the instrument can be regarding to the password protection these are 1 Protection is active In the me
24. PICAS V2 6 1 SYSTEM menu structure Overview The device or PICAS unit with which the keyboard display is communicating ew NGLISH DEVICE ADDR 001 CARRIER FREQ System menu 1 CF MASTER The cursor indicates the selected field of the menu DEVICE 1 SYSTEM System menu 2 MENU COMMUNICAT The menu type seleced either CHANNEL or SYSTEM Eug MENU ACTIONS System menu 3 The menu number and its name DEVICE 1 SYSTEM CHOOSE ACTION SCOPE CHANNEL ACTION DATE TIME Password System menu 4 DEVICE 1 SYSTEM MENU MEAS PARMS System menu 5 Page 32 of 59 RS 232 SPEED RS 485 SPEED DEVICE nr 2 DEVICE nr 3 DEVICE nr 4 Configure CHOOSE ACTION ACTION SOURCE CHAN CHANNEL 1 CHANNEL 2 CHANNEL 3 CHANNEL 4 PRESENTATION DISP TIME S DISPLAY RESET PEAK PEAK OPTION 5000 Hz YES 00009918 SERIAL NUMBR FIRMWARE i W The field names and settings within a menu 19200 BAUD 19200 BAUD 00000000 00000000 00000000 execute CALIBRATION execute 01 YES YES YES YES STORE SETUP CHANNELS SETUP 1 execute 27 11 03 13 45 12 AMPLIF Vout 0 5 Actual lt execute gt Hold Peekel Instruments System menu Password menu DEVICE 1 DATALOGGING SYSTEM CLEAR BUFFER FACTOR CHANNEL 1 CHANNEL 2 CHANNEL 3 CHANNEL 4 MENU DATALOG 0 0 DEVICE 1 SYSTEM MENU Password User ma
25. S485 bus all the PICAS systems should be master or just 1 PICAS is master and all the other systems are slave If more then 1 PICAS is master the synchronization frequency on the RS485 will be the sum of the frequencies send by each PICAS This signal will be out of specification to be used for synchronizing the PICAS units In this case the slave PICAS will not operate within specifications Serial number this is automatically displayed and cannot be altered Firmware version no this is the automatically displayed version number of the firmware installed and cannot be altered Contrast this is the contrast setting of the display A higher number will darken the display Page 34 of 59 Peekel Instruments User manual PICAS V2 6 1 3 5 2 System menu Communication With this menu you can set up the various parameters for communication between 2 or more PICAS instruments via the RS 485 port and or using a PC which is connected via the RS 232 connection DEVICE 1 RS 232 SPEED 19200 BAUD SYSTEM RS 485 SPEED 19200 BAUD DEVICE nr2 00000000 DEVICE nr3 00000000 DEVICE nr 4 00000000 Configure lt execute gt Controls and Functions RS 232 Speed selectable 4800 9600 19200 38400 RS 485 Speed selectable 9600 19200 38400 Device nr 2 editable 00000000 99999999 Device nr 3 editable 00000000 99999999 Device nr 4 editable 00000000 99999999 Configure execute Functional Description In the first and sec
26. User manual PICAS PEEKEL INSTRUMENTS B V PEEKEL INSTRUMENTS GMBH p E E KE L INDUSTRIEWEG 161 BERGMANNSTRASSE 43 3044 AS ROTTERDAM 44809 BOCHUM INSTRUMENTS TEL 010 415 27 22 TEL 0234 904 1603 FAX 010 437 68 26 FAX 0234 904 1605 EMAIL sales peekel nl EMAIL Peekel t online de Peekel Instruments B V User manual PICAS V2 6 1 Contents 1 INTOdUCUIN Pr me Deme 1 1 pe ee Re Ei Aaa 4 1 2 General a ftd etu ee o ananas 5 1 3 The Carrier Frequency principle nennen enne 5 1 4 General design principles i 6 2 Connecting the instrument 7 2 1 Carrier frequency inputs on CA2CF ii 7 2 1 1 Connecting the TransdOUcers i 7 2 1 2 About Cable capacitance i 7 2 1 3 Bridgeconnector piNOUt ii 8 2 1 4 FulEbridge aaa ia 9 2 1 5 alti OG cierra ar ito 10 2 1 6 Quarter bridge using 2 wires ii 11 2 1 7 Quarter bridge using 3 wires ii 11 2 1 8 Displacement Transducers sssessssseseeeeeeeeneeeen nnne nennen nennen nnne nnn 12 2 1 9 Potentiometer connection iii 13 2 2 Analog inputs on CAAAI enne nene ntes entres a Aaii E A Taai 14 2 2 1 Analog input connector PINOUT ccoooccccccnoccccconancncnonnnccncnanoncncnnnnnnncnnnn eene 15 2 2 2 Potentiometer connection ui 16 2 2 3 Connection of a resistor
27. V V at 5 volt excitation This allows for 1 25Q total leadwire resistance in series with a 120Q straingauge A bridge voltage of 0 5 volt however gives a 10 times balance range and enables 12 50 leadwire in series with a 1200 straingauge The temperature influence on the cable resistance cannot be compensated The temperature coefficient of copper of 0 4 C will give rise to 8 3 u V V offset change for each Q in series with a 1200 straingauge Short and thick cabling is evidently necessary 2 1 7 Quarter bridge using 3 wires Most of the problems mentioned before can be avoided by using the 3 wire connection method It adds the resistance of the Ex leadwire to the external straingauge and it adds the resistance of the wire leading to the internal t4 bridge completion to this internal 1 4 bridge resistance Only the difference in leadwire resistance and connector contact resistance gives signal offset EX E c el EX 1 4 IN 1 4 o 9 polig 9 05 male Sub D a gt _ i Connect cable screen to mu connector case t B TIN Figure 6 Quarter bridge 3 wire straingauge connection Page 11 of 59 Peekel Instruments User manual PICAS V2 6 1 A similar situation as with the Y2 bridge connection method has appeared Every 1 ma of difference in resistance when using 1200 straingauges gives a change in signal offset of 2 u V V This m
28. arts The trip value can be set to a numerical value at which a switching action of the tripping function has to work This value shall be any level from within the measuring range see range menu Hysteresis can be set as the value at which the trip function goes back to normal again Normally this is a percentage of the trip value Example you wish to get a trip at 98 of the maximum measured value of say 100 You then set the Trip Value at 98 If you now adjust the hysteresis at 3 the trip mechanism will perform a switch action at the digital output for connections see 3 5 3 This digital output will switch back to normal when the measured value reaches a value of 98 3 95 The digital output switches again if the measured value then comes to 98 again Unit is automatically displayed according to the measuring range set earlier Trip Control offers the facility of either not tripping at all tripping when a high level or tripping when a low level of the measured value is reached Act Period Activation Period determines the minimum time span during which a trip will remain active When set to anything other than 0 the trip will stay active for at least the given amount of time If after this time the trip is still active another span of the same duration is entered Page 49 of 59 Peekel Instruments User manual PICAS V2 6 1 3 7 CAAAI channel menu s Device Excitation 5V Channel Meas Type V
29. ay be compensated internally by the balance circuit However the temperature influence cannot be compensated for Short and thick cabling is again highly recommended 2 1 8 Displacement Transducers LVDT s or Linear Variable Differential Transformers may be configured as full or half bridges The connection method for both possibilities is shown in the next figures EX EX EX IN 9 polig male Sub D 9 05 j Connect cable screen whl EX connector case 7 Anes See eae gt IN Figure 7 Connection of a full bridge Ivat EX n FEX A E ae ee ae EX SE SE IN ds 9 polig a male Sub D 19 2 05 Connect cable screen whl EX connector case IN Figure 8 Connection of a half bridge Ivdt Page 12 of 59 Peekel Instruments User manual PICAS V2 6 1 2 1 9 Potentiometer connection A potentiometer can be connected as a half bridge 3 wire connection EX SE SE 9 polig male Sub D 19 05 Connect cable screen if EX connector case f 9 IN Figure 9 Potentiometer connection as a half bridge 3 Wire The linearity of the measurement is influenced by the impedance of the potentiometer When the potentiometer value is between 120 and 350 Ohm the linearity of the measurement i
30. e devices if connected at the RS 485 bus display UP DOWN RIGHT LEFT Page 25 of 59 Peekel Instruments User manual PICAS V2 6 1 CHANNEL scrolls through the 4 channels of the ENTER to acknowledge an edited command or to Picas device selected initiate an action if ENTER is required MENU scrolls through the menu selected SPACE to type a space when editing either SYSTEM or CHANNEL CANCEL to cancel a manually edited command The example above shows the MEASURE display with one channel large in engineering units GENERAL 1 SENSOR 2 STRAIN 3 RANGE 4 BALANCE 5 TRIPS 6 ACTIONS 7 MEMORY 8 9 Logging 0 SYSTEM SET MEAS lt EXP MEASURE EXP gt and all 4 output signals small in volts Shortcut to Channel menu GENERAL decimal 1 when entering data Shortcut to Channel menu SENSOR decimal 2 when entering data Shortcut to Channel menu STRAIN decimal 3 when entering data Shortcut to Channel menu RANGE decimal 4 when entering data Shortcut to Channel menu BALANCE decimal 5 when entering data Shortcut to Channel menu TRIPS decimal 6 when entering data Shortcut to System menu ACTIONS decimal 7 when entering data Shortcut to System menu MEMORY decimal 8 when entering data decimal 9 when entering data Shortcut to System menu Logging decimal 0 when entering data Shortcut to System menu GENERAL decimal dot
31. e a ei 51 GAGA menu Sensors imc nec tabe dettes lid 52 CAAA Menu Ra till eap eli o talca dd 53 GAAA ment Tatin dd toda 54 CAGA ments TIDS treat ertt er E P I REED dabas 55 Problem resolving s 57 Technical Specifications 58 Version number Release date March 2008 Author J H Steeneveld Page 3 of 59 Peekel Instruments User manual PICAS V2 6 1 1 Introduction 1 1 Power The instrument is powered from an earthed 230 V 50 Hz mains through a standard euro plug The power switch is at the rear WARNING Do not open the case There are no user serviceable parts inside Danger for electrical shock hazard Just below the power switch the fuse of 1A slow is present WARNING Replacing the fuse must be done with the power cord disconnected to prevent electrical shock hazard Page 4 of 59 Peekel Instruments User manual PICAS V2 6 1 1 2 General PICAS is a tabletop stand alone compact amplifier system from Peekel Instruments B V It can be connected as one node station in a larger decentralized system by using the integrated RS 485 bus connection PICAS is delivered with an LCD front and pushbuttons for the operation of the system The PICAS can be also be connected to a external PC through a RS232 or USB interface It is designed to be used for high accuracy experimental and industrial measurements and can be used
32. e does not change and can be used again by setting use balance to yes again When a sensor or strain gauge bridge with unknown unbalance is connected it is possible to use the auto balance function If enter is pressed on the appropriate line a measurement is done and the result is placed on the balance lines The output of the amplifier should be near 0 volt In the larger ranges an output signal of a few millivolts may be left In the 100uV V range however a maximum of 50mV may be left at the output because of the 0 5uV V resolution of the input balance The balance values are displayed and entered in the unit displayed in this menu The unit value cannot be changed in this menu Page 48 of 59 Peekel Instruments User manual PICAS V2 6 1 3 6 6 CA2CF menu TRIPS This menu offers the possibility to monitor the measured value and add trip functions to each measurement DEVICE 1 TRIP VALUE CHANNEL 1 HYSTERESIS UNIT TRIP CONTROL HIGH SIGNAL ACT PERIOD 200 ms Controls and Functions Trip Value editable 0000000 999999 Hysteresis editable 0000000 999999 Unit provided by system Trip Control selectable unactive high signal low signal Functional Description Of each PICAS each one of 4 channels can be selected in this menu by CHANNEL up or down Before setting the trip levels all other parameters have to be set Adjusting Trip Levels is practically the last adjustment before actual measuring st
33. e signal mode is usually set to normal In capacitive mode the amplifier does not measure the normal resistive signal from the straingauges but the capacitive phase shifted signal caused by cable capacitance and other parasitic causes Although the amplifier is designed to distinguish between the desired measurement and error signals when this signal is large full scale or more it can affect the accuracy of the normal measurement Capacitive unbalance is mostly observed in quarter bridge configurations with several meters of cabling Page 43 of 59 Peekel Instruments User manual PICAS V2 6 1 At the Bridge load line the bridge load seen from the input of the amplifier must be entered This value is used together with the input impedance from the amplifier about 50KQ to optimize the measurement value When a bridge with a large impedance is used this value becomes more important because the voltage division at the input will cause an error in the measurement At the Bridge compl line the internal bridge complementation can be selected A selection can be made from the following options 1 1 bridge with this selection a full bridge must be connected Ye bridge with this selection the internal 1 2 bridge is connected toe the IN pin The external 2 bridge must be connected to the IN pin Y gt 1200 with this selection a 120 resistor is internally connected between the Ya pin and the EX pin Just connect 1 1200 staingauge betwe
34. ection The connection of the 2 bridge completion to IN sets the amplifier for positive gain so connecting the IN signal to EX gives a positive outputsignal although in overload Half bridge connections are more critical than full bridge The leadwire resistances in the EX lines are in series with the 2 straingauges in the Wheatstone bridge Any slight unbalance in these leadwire resistances will give rise to signal offset Every 1mQ difference in resistance on a 1209 bridge gives 2 uV V offset This may be compensated by use of the internal balance circuit However temperature influence can not be compensated Short thick cabling is highly recommended Page 10 of 59 Peekel Instruments User manual PICAS V2 6 1 2 1 6 Quarter bridge using 2 wires Application of quarter bridges is the simplest but least accurate way of measuring The leadwires in 2 wire configurations are completely incorporated in one arm of the straingauge bridge Every 1 mQ of cabling resistance in series with a 1200 straingauge will directly add 2 u V V signal offset though in practical situations it is more likely to meet several ohm s of resistance EX j EX SE SE HN _ 9 polig ny o gt male Sub D pm oy Pa Connect cable screen to l connector case E K IN Figure 5 Quarter bridge 2 wire straingauge connection The internal balance compensation range is 65 m
35. el menu Page 57 of 59 Peekel Instruments User manual PICAS V2 6 1 5 Technical Specifications Carrier frequency inputs of the CA2CF card General Typical accuracy class Bandwidth 3 dB Maximum cable length Sensor connection Bridge supply transformer isolated Supply voltage Voltage accuracy Frequency Frequency accuracy Load Internal bridge completion Measuring input transformer isolated Ranges 5V excitation Input Filter High pass Max Common Mode Voltage Common Mode Rejection 50 Hz Serial Mode Rejection Capacitive input overload Special input filtering for noise reduction Balance control R balance C Balance at 120 Q bridge Output Full scale voltage Protection Maximum capacitive load Maximum cable length Frequency 3 dB Filter type Analog inputs of CA4Al card General Typical accuracy class Bandwidth 3dB Sensor connections Sensor supply Voltage Current Power for active sensors 0 196 2000 Hz 500m 2 9 4 or 6 wire configurations 0 5 5V adjustable t 0 05 5 kHz t 196 60 1000 O 0 1 1000 3000 O 50 1926 Ve bridge und V4 bridge 120 350 t 100 uV V 1 V V gt 500 Hz 200V gt 120 dB gt 66 dB max 7x range permissible 65 mV V up to 10 nF 10 V long term short circuit allowed 10nF 100 m 0100 pF m lt 2000 Hz 7 pole low pass Butter worth
36. ems are only available on the PICAS with the USB controller Functional Description With action you select if you want to store setup load setup or get default parameters The default values are factory set and can always be used as a safe starting point with known values The action Store setup is only available when the instrument is not in the protected mode The scope allows you to save recall the settings of the channels only the system only or both the system channels at the same time As the system parameters do not need a change too often here it is usually sufficient to select channels 4 different channel settings can be saved At start up PICAS will always load Setup 1 If the cursor of this menu points to memory pressing the ENTER button saves all current Channel and System settings into the instrument s non volatile memory What is saved exactly is defined by the action and scope settings see corresponding paragraphs Note that you must deliberately save parameters before they can be recalled Changes in amplifier settings are not automatically stored Note that PICAS always starts up with loading channel Setup 1 If you do not save your settings deliberately the saved settings may be those from earlier measurements with totally different settings Therefore first check all parameters for your application or load default values The Date and Time lines will display the actual date time when the menu is selected
37. en the EX and the 4 pin to measure this strain gauge Y gt 350 Q with this selection a 350 resistor is internally connected between the Ya pin and the EX pin Just connect 1 3500 staingauge between the EX and the 4 pin to measure this strain gauge With the presentation setting the presentation of the value on the display is influenced When it is set to default the presentation will follow the setting in System menu 5 When it is set to another value this setting will overrule the setting in the system menu 5 Page 44 of 59 Peekel Instruments User manual PICAS V2 6 1 3 6 2 CA2CF menu SENSOR This menu specifies the connected sensor like a load cell or a LVDT If plain strain gauges are used it is easier to use the strain gauge menu number 3 DEVICE 1 SENSOR RANGE 10 0 k CHANNEL 1 PHYSIC UNIT N SENSOR V V 10m MENU MEAS SENSOR execute SENSOR AUTO BALANCE execute 0 0577 V Controls and Functions Sensor Range adjustable 10 000 gt gt gt 10 000 with selectable suffix pico Tera Physic Unit selectable N Nm N mm Pa ppm psi t V V V bar C g g mm G Hz inch K Ibs m m m m s or m s Sensor V V editable 00 000 gt gt gt 10 000 with selectable suffix pico Tera Meas Sensor execute Auto Balance execute Functional Description Sensor range specifies the physical stimulus force displacement that will generate sensor v v
38. er can be entered This number multiplied by the factor indicates the measurement interval for the channel When 000 is entered for a channel that channel will not be measured Page 39 of 59 Peekel Instruments User manual PICAS V2 6 1 The maximum number which can be entered is 250 PB6100 the selectable steps are 100 usec 1 msec 10 msec 100 msec or 1 second For each channel an interval time can be entered This interval time must be a multiply of the selected step The maximum interval time is 65000 x selected step To start the measurement select cyclic log or log amp fill RAM on the datalog line In log fill RAM mode the device will measure until the available RAM is full In cyclic log mode the device will continue measuring until stopped manually overwriting old measurement data when the buffer is full The percentage on the left side of the display shows the current usage of the buffer The buffer can contain up to about 29500 for the PB6000 and 500000 for the PB6100 measurement values Due to bookkeeping overhead this total amount will be lower when the interval times are higher ie for slower measurements PB6000 If you attempt to start a new measurement while there is still data in the buffer the message Clear buffer first will be displayed and the measurement will not start Use the clear buffer function to remove the previous measurement or transfer it to a PC first If the configured
39. es Housing PICAS 250 x 330 x 110 mm Bx T x H Power supply Operating temperature 100 240 VAC 50 60 Hz 0 50 C Note the PB600 controller board is not used in new systems Page 59 of 59
40. eset Runn At the right side of the display the low and high peak values of each channel are displayed Those values are updated whenever the peak values changes On the bottom of the display 2 commands are present As shown above none of these commands are selected With the left and right cursor keys a command can be selected A selected command is displayed between brackets like lt Reset gt The selected command can be given with the enter Button When no command is selected the enter button has the same functionality as by the actual values display When the lt Runn gt is displayed it means that the peak holding function is running Pressing the enter button when the lt runn gt command is selected will stop the peak holding option The last peak values remain on the display but will not be updated anymore The lt Runn gt text will be changed in lt Hold gt When the peak holding option is running this function will be activated all the time even when the peak holding display is not on the screen The Hold Runn and Reset commands can also be given in Set Meas menu When a channel or system menu is displayed and the measure button is pressed the setting in Set Meas menu will determine whether the actual value or the peak value display is shown When the Reset command is given the low peak values will be set at and the If the Peak option is not running and the reset command is given the followi
41. ible There is a 1096 margin to compensate cable losses when using 6 wire connections sensing This allows for e g 12 Q total cable resistance when using 120 Q straingauges at 5 volt excitation After the value is accepted for bridge volt the amplifier will automatically perform a calibration It measures the real bridge voltage using the sense lines and corrects any deviation It is therefore necessary that the sense lines are connected on the bridge connector When sensing is not used to compensate cable losses it is still necessary to connect the sense lines on the connector itself This calibration can also be done later with the calibration parameter It is even necessary when another sensor or straingauge with different resistance is connected to the amplifier Just press the ENTER button at this line while the sensor and sense lines are connected 2 Notice that the output voltage of the amplifier will be disturbed during the calibration Null and full scale reference measurements are done and will be visible in the amplifier output signal The local display will not show any error because it just does not measure during the calibration The polarity parameter gives an easy method of changing the polarity of the output voltage without changing the wiring But use normal if you do not need inverted polarity Inverted polarity is the same as a negative gain When such a negative gain is entered the polarity will be on inverted mode Th
42. is entered When a channel is in the Trip status this is presented on the display a on the left side of the display after the unit of the measured value a up or down arrow is presented T o 1 b in the Measure Display on the bottom line the text TRIPPED is displayed Only channel 1 to 4 have a digital output on the trip status When a channel exceeds the trip level the output will be activated Page 55 of 59 Peekel Instruments User manual PICAS V2 6 1 Page 56 of 59 Peekel Instruments 4 Problem resolving Error description User manual PICAS V2 6 1 Possible course The connected sensor does not generate any signal Is the sensor supply present 1 Is the CF MASTER in the general system menu selected to YES 2 If 2 or more PICAS units are used and the CF are synchronized only 1 PICAS must have the CF MASTER to YES At the other units the CF MASTER must be at NO Check the cabling of the RS485 connectors The measurement signal is changing with a slow sinus wave form When more PICAS units are used together it is possible that the different carrier frequencies will influence each other In this case the PICAS units must be synchronized see General system menu The linearity of the signal is not within specifications When the sensors have a higher impedance a error may occur at the input To compensate this the correct impedance must be entered in the general chann
43. ll give 0 04 C change in sensitivity Short thick cabling is therefore recommended EX TEX EI EX SE SE Je 6 oV HN SIGNAL SN o 9 polig 5 male Sub D 9 05 Pas Connect cable screen to a EX connector case T IN e IN Figure 1 Full bridge 4 wire straingauge connection EX EX SE EX SE SE 6 HN O4 SIGNAL SN 9 polig P male Sub D 9 05 as Connect cable screen FN EX connector case CXOCXCOCOCOCOXON T IN Figure 2 Full bridge 6 wire straingauge connection Page 9 of 59 Peekel Instruments User manual PICAS V2 6 1 2 1 5 Half bridge Figure 2 shows half bridge configured straingauges The 2 bridge completion resistors are internally connected to IN EX EX EX SE SE 6 ol Y IN o 9 polig 3 male Sub D 97 05 2 Connect cable screen to A1 EX connector case B 7 9 IN Figure 3 Half bridge 3 wire straingauge connection EX EX SE SE 6 ol IN TO e 9 polig P E male Sub D 9 05 Pas Connect cable screen to c EX connector case T SE D IN Figure 4 Half bridge 5 wire straingauge conn
44. menu Thermocouple measurement This is a special case measurement because 2 temperatures has to be measured First of course the signal on the terminals of the CA4AI card Somewhere in the connection of the thermocouple a junction is present The temperature of this point must be known to determine the correct temperature measured by the thermocouple This extra measurement must be done with channel 1 The selected type must be CJC and a PT100 must be connected to the input of channel 1 This PT100 must be placed near the junction of the thermocouple connection A special item is available to measure the temperature of the terminal of channel 1 Due to this no more then 3 thermocouple signal can be measured on each CAAAI card Page 51 of 59 Peekel Instruments 3 7 2 CA4Al menu Sensor Device 1 Channel 3 Physic unit Sensor max Sensor min Signal max Signal min Menu Sensor 00 006 V Controls and Functions Physic Unit selectable Sensor max adjustable selectable suffix Sensor min adjustable selectable suffix Signal max adjustable selectable suffix Signal min adjustable selectable suffix Functional Description User manual PICAS V2 6 1 N Nm N mm Pa ppm psi t V V V bar C g g mm G Hz inch K lbs m m m m s or m s 10 000 gt gt gt 10 000 with pico Tera 10 000 gt gt gt 10 000 with pico Tera 10 000 gt gt
45. mory menu an extra line is displayed to enter the password On top of this menu at the selection of the actions the Store setup command is not available The Password menu is also not available 2 The user is logged on To do this the right password must be entered on the bottom line of the Memory menu After this the selection of the Store setup is available again Also the password menu can be selected by pushing 3 times on Menu 3 The protection is switched off In this case the password is set at 0 This is also the default condition of the instrument The Password menu is available and the extra line at the Memory menu is not displayed because there is no need to log in How to enter a new password is explained at the description of the password menu 3 2 Software Installation 3 2 1 Loading new versions of firmware Updates New firmware versions are distributed on CD or e mail If new firmware versions becomes available this can be easily installed into the firmware memory of your PICAS system After connecting the communications port of the PICAS with a COM port of your PC just run the UPDATE program from the update diskette 3 3 Human Interfacing 3 3 1 Navigating the LCD display and the pushbuttons The functioning of each individual pushbutton on the frontpanel of PICAS will now be explained DEVICE scrolls through the various Picas The 4 CURSOR keys are for navigating through th
46. n the display When more then 4 channels are present in the PICAS scrolling through the list of channel values can be done with the arrow up down keys Pressing the measure button the selected view will be presented on the display Pressing this button again will select the next display layout 3 4 1 Actual value display When the measure button is pressed the following display will be presented DEVICE 1 04 738 V 01 546 V 06 432 V 09 089 V CHANNEL 1 Pressing the enter button will change the unit of the presentation of the values in Signal V V which presents the value of the input signal Output V which presents the output voltage of the amplifier and Physic Unit which present the physical unit of the measured signal This selection can also be made in the presentation line on System menu 5 When a measured value reaches the level of trip setting in channel menu this trip status will be presented on the display as follows DEVICE 1 04 738 V 08 734TV 06 432 V 09 089 V CHANNEL2 TRIPPED When this display is presented and the measure button is pressed again the peak value display will be presented Page 29 of 59 Peekel Instruments User manual PICAS V2 6 1 3 4 2 Peak value display The peak value display has the following layout ar DEVICE M Low Peak High Peak 404 738 V 01 789 05 645 08 734 V 03 342 09 786 06 432 V 04 536 07 687 09 089 V 03 879 09 123 R
47. nd Functions Range of selectable Signal V V Sensor Strain Range adjustable 10 0 10 0 and selectable pico Tera Unit provided by system Output V Maximum voltage on output when input voltage is equal to the range Functional Description The parameter range of determines the interpretation of the range parameter As it is set to amplifier the range represents the amplifier range in V V When it is set to sensor the range takes into account the values from the sensor menu and the range is shown with the physical unit from the sensor menu If range of is set to strain the range is calculated using the values in the strain menu and the physical unit will be m m g mm2 or N mm2 As the range of parameter is changed the unit parameter will change as well That unit can not be modified from within this menu but only in the sensor and strain gauge menu s The range of parameter also determines how measurements are shown on the display when the presentation parameter in the system menu 5 behind the set meas button is set to physic unit The electrical range of the amplifier when range of is set to amplifier can be set between 100uV V and 1 V V Using smaller bridge voltages than 5 volt this has limitations on the smallest value that can be set as the range If the range is adjusted wrongly an indication Calc gain too large Settings adjusted appears in the lower part of the LCD display The settings are adjusted
48. ng display will be presented A DEVISE H Low Peak High Peak 04 738 V 08 734 V 06 432 V 09 089 V Reset When the peak holding option is on every 10 milli seconds 1 channel is measured This value is used for the peak holding determination In this way every channel is converted every 40 milli seconds When this display is presented and the measure button is pressed again the Sum diff value display will be presented Page 30 of 59 Peekel Instruments User manual PICAS V2 6 1 3 4 3 Sum difference value display This display has the following layout DEVICE 1 04 738 V 01 734 V 06 432 V 02 089 V On the right side the sum and difference values of channel 1 amp 2 and channel 3 amp 4 are displayed In case of a 2 channel PICAS the values related to channel 3 amp 4 are not displayed When this display is presented and the measure button is pressed again the Bar graph value display will be presented 3 4 4 Bar graph value display This display has the following layout 1 04 472 mV V 2 06 143 mV V DEVICE 1 The actual value of the channels is presented on the left in a bar graph view On the right the actrual values are presented as numbers When this display is presented and the measure button is pressed again the Actual value display will be presented Page 31 of 59 Peekel Instruments 3 5 System menu s User manual
49. ntrols and Functions Datalogging selectable Inactive Cyclic Log Log amp Fill RAM Password editable a numeric value can be entered here which is larger then 32000 and smaller then 32000 Set password execute When this command is given the entered password is saved and made active Log off lt execute gt After this command the entered password is erased and the protection is activated Functional Description This menu is only available when the correct password is entered in the Memory menu or if the password protection is not activated At the first line a password can be entered Choose a numeric value between 32000 and 32000 enter this value and give the command Set password Now the password is saved in nonvolatile memory To enter the protected mode give the command Log off Because this menu is only available in the non protected mode this menu will immediately disappear when the Log off command is entered Page 41 of 59 Peekel Instruments 3 6 CA2CF channel menu s Channel menu 1 Channel menu 2 Channel menu 3 Channel menu 4 Channel menu 5 Channel menu 6 User manual PICAS V2 6 1 CHANNEL menu structure Overview DEVICE 1 CHANNEL 1 MENU GENERAL 30 0577 V DEVICE 1 CHANNEL 1 MENU SENSOR 30 0577 V DEVICE 1 CHANNEL 1 MENU STRAIN 30 0577 V DEVICE 1 CHANNEL 1 MENU RANGE 30 0577 V DEVICE 1 CHANNEL 1 MENU BALANCE 30 0577 V DEVICE 1 CHANNEL 1 M
50. nual PICAS V2 6 1 Password Set password Log off Page 33 of 59 INACTIVE lt execute gt 10 msec 002 002 000 000 Kk oR lt execute gt lt execute gt Peekel Instruments User manual PICAS V2 6 1 3 5 1 System menu GENERAL This menu is for the most general system settings DEVICE 1 LANGUAGE ENGLISH CARRIER FREQ 5000 Hz GENERAL SERIAL NUMBR 00009918 FIRMWARE FW 991012 CONTRAST 57 Controls and Functions Language selectable English Deutsch Nederlands Device Address selectable 1 gt gt gt 99 Carrier frequency provided by system CF Master selectable Yes No Serial number provided by system Firmware version no provided by system Contrast selectable Functional Description Language can be toggled here between English German Deutsch and Dutch Nederlands f you want to start up always with the same language you must specifically save the system settings from within the system menu 3 memory Device Address can be selected from 1 to 99 and is to be used when more than one PICAS are connected to the bus Carrier frequency this is automatically displayed and cannot be altered CF master should always be set to yes if the device is operated separately If more than one PICAS is connected to the bus only one is to be called the master and the other s being slaves should be set to no When more PICAS systems are connected to each other through the R
51. oltage Hena Generar MENU Presentation Default General 00 006 Device Physic unit Channel Sensor max Sensor min Menu Sensor Menu Signal max Sensor 00 006 Signal min Device Range of Meas value Channel Range 10V Menu Range A Unit V Menu Range 00 006 Device Auto Tare execute Channel Tare 40 0 Menu Tara Unit V Menu Tare 00 006 Use Tare Yes Device 1 Trip value Channel 3 Hysteresis Menu Trips Menu Uu Trip control Inactive Act Period Trips 400006 V di Page 50 of 59 Peekel Instruments User manual PICAS V2 6 1 3 7 1 CA4AI menu GENERAL Device 1 Excitation 5V Channel 3 Meas Type Voltage ZZZ Presentation Default MENU General 00 006 V Controls and Functions Excitation selectable SVorlmA Meas Type selectable Voltage 20mV 10V Current 5mA 50 mA Resistor 100 75000 PT100 PT1000 CJC Only selectable on channel 1 On channel 2 3 and 4 of each card the following thermocouples can be selected Type B E J K N R S and T Presentation selectable default Signal V V Physical unit Functional Description In this menu the general settings for the channel are made At first a choice must be made for the sensor excitation to be Voltage of Current The next selection is the type of measurement to be done In this menu only the type is selected The range selection is made in the Range
52. on Before setting the trip levels all other parameters have to be set Adjusting Trip Levels is practically the last adjustment before actual measuring starts The trip value can be set to a numerical value at which a switching action of the tripping function has to work This value shall be any level from within the measuring range see range menu Hysteresis can be set as the value at which the trip function goes back to normal again Normally this is a percentage of the trip value Example you wish to get a trip at 98 of the maximum measured value of say 100 You then set the Trip Value at 98 If you now adjust the hysteresis at 3 the trip mechanism will perform a switch action at the digital output for connections see 3 5 3 This digital output will switch back to normal when the measured value reaches a value of 98 3 95 The digital output switches again if the measured value then comes to 98 again Unit is automatically displayed according to the measuring range set earlier Trip Control offers the facility of either not tripping at all tripping when a high level or tripping when a low level of the measured value is reached Act Period Activation Period determines the minimum time span during which a trip will remain active When set to anything other than O the trip will stay active for at least the given amount of time If after this time the trip is still active another span of the same duration
53. ond line you can select the Baudrate with which to communicate with the external device s It shall be noticed that the other device s are set to the same Baudrate The device from which you can communicate with the other s is always device number 1 Device 1 thus is the Master on the RS 485 bus For Devices numbered 2 3 4 the serial numbers can be entered Serial numbers can be found at the labelsticker but are also fixed in the firmware and can be read in System Menu 1 General With the cursor at configure and pressing ENTER device number 1 sends a broadcast over the bus informing the devices with the respective serial numbers that from then on they are named Device 2 3 and so on Page 35 of 59 Peekel Instruments User manual PICAS V2 6 1 3 5 3 System menu Actions This menu enables the user to order a number of centralized ACTIONS which then can be performed by the system in one go DEVICE 1 CHOOSE ACTION CALIBRATION SYSTEM ACTION execute SOURCE CHAN 01 MENU CHANNEL 1 YES ACTIONS CHANNEL2 YES CHANNEL3 YES CHANNEL4 YES Controls and Functions Choose Action selectable Calibration Copy Params Auto Balance Disable BAL Use Balance Action execute Source Chan selectable 01 04 Channel 1 selectable Yes No Channel 2 selectable Yes No Channel 3 selectable Yes No Channel 4 selectable Yes No Functional Description In the first line you can select the required action
54. ontacts pin6 TXD 3 pin7 RXD 26 M pin8 IB in le pin 9 gt Sr 2 4 2 USB This interface is only present on the fast controller It is used for data communication between the PICAS and the PC The PICAS is a USB device and the USB connector on the back side is a type B connector It is a USB V1 1 interface When the PICAS has a USB interface only 1 RS485 connector is present Page 20 of 59 Peekel Instruments User manual PICAS V2 6 1 2 4 3 RS485 interface The RS 485 interface connector is used to build a network bus between 2 or more PICAS units By using System menu 02 this communication can be established Connections shall be made on a 1 to 1 basis with twisted pair lines The SYNC connection is to synchronize the oscillator frequencies of the various units The cable used for this connection must have separated shielded twisted pairs for the communication lines and the sync lines to avoid interference between the communication and synchronization signals If not used sometimes the measuring might be disturbed pint do not use this connection pin2 Ground Seen against ping DATA mete o N contact in4 i 5 Signal Ground Gianni 29 pin 6 DATA 39 68 DATA pin 7 SYNC 4 i 09 SYNC pin8 DATA Signal Ground 50 J ping SYNC Lol rear side C rear side of PICAS RS 485 Cs rear side C of PICAS RS 485 CJ of PICAS RS 485 Terminator
55. plug Cable screen should be connected to the connector case Do not connect to pin 5 rear side O of PICAS RS 485 va Terminator plug Schematic view of a 4 PICAS network with terminator plugs Note on the PICAS with the fast controller only 1 RS485 connector is present A separate external adapter can be ordered which holds 2 RS485 connectors Page 21 of 59 Peekel Instruments User manual PICAS V2 6 1 2 4 4 Rear panel connections DIGITAL I O _ANALOG OUT INPUT 1 INPUT 3 INPUT 4 COMMON OUT RS 232 RS 485 gt xo m A 7 c m De 230V 50HZ 1A Rear panel of a PICAS with 2 Carrier frequency channels 4 analog DC channels and a USB interface Page 22 of 59 Peekel Instruments User manual PICAS V2 6 1 2 4 5 Option Sum amp difference values A extra hardware option is available for a 2 channel PICAS This option will determine the sum and difference of the values of channel 1 and 2 The sum value will be available on the analog output of channel 3 and the difference value will be available on the analog output of channel 4 These sum and difference values are also presented on the display see 3 4 3 Page 23 of 59 Peekel Instruments User manual PICAS V2 6 1 3 Setting up the instrument 3 1 General 3 1 1 Power up When the power switch at the rear of the instrument is switched ON l for a short time the display shows the PEEKEL Instruments logo after which it comes into
56. re than 4 7 times the selected measurement range of the amplifier In the most sensitive range of 100 uV V this would allow for 10 meters of cabling The presence of such a large C signal is not recommended though In quarter bridge configurations therefore it is common practice to compensate the capacitance by a fixed capacitor built in the other arm between pins EX and Y Page 7 of 59 Peekel Instruments User manual PICAS V2 6 1 2 1 3 Bridgeconnector pinout pin 1 EX excitation pin2 EX excitation pin3 IN input pin4 IN input pind Gnd ground pin6 SE sense pin7 SE sense ping ping 1 4 quarter bridge completion resistor 120 or 350 ohm The straingauge bridges and lvdt s are connected through 9 pole male DSUB connectors The pin connections are shown in the above table The abbreviations are as follows EX Excitation to the transducers For the carrier frequency amplifier this is an ac signal of 0 5 to 5 volt at normally 5000 Hz Although the polarity signs do not have a meaning for this ac signal they are used here to indicate the relation with IN and IN FIN Differential input of the amplifier Like for the excitation the polarity signs wouldn t have a meaning if they weren t used to indicate the relation with EX and Ex Connecting EX to IN and EX to IN should give a positive but overload outputsignal SE Sense lines for 6 wire connection of full bridge
57. s The SE and SE connections have to be connected see diagrams at the next pages in order to compensate for the voltage drop of the EXcitation voltage over the lines connected to the measuring sensors Va Quarter bridge completion resistor 120 or 3500 precision resistor A single external straingauge can be completed by the internal resistors in the other bridge arms available through 4 pin The 4 bridge completion resistor is internally connected to Ex With the settings a choice can be made between a 120 Q or a 350 internal compensation resistor Gnd ground At this pin the ground from the system is connected Normaly this pin is not used Screen When a cable is used with a screen this screen must be connected to the housing of the connector For the optimal screening this housing must be metalised Page 8 of 59 Peekel Instruments User manual PICAS V2 6 1 2 1 4 Full bridge Figure 1 shows the connection of a full straingauge bridge This is the most reliable configuration The leadwire resistances affect only the sensitivity of the bridge For instance 6Q resistances in both the EX as well as the EX wire connected to a 1200 bridge give a decrease in outputsignal of 9 196 This can be compensated by using the internal sense circuit However that does not compensate the temperature influence on the leadwire resistance A temperature coefficient of 0 4 C on 120 of copperwire connected to a 1200 bridge will sti
58. s within O 1 96 When measuring a Potentiometer based sensor the mid position of the potentiometer will be the zero point Moving the potentiometer to the minimum or maximum position the output value will be in the range of full range to full range 100 to 10094 Based on the actual input resistance of the CA2CF of about 50K the following non linearity will be present when measuring a potentiometer with a higher value potentiometer value linearity 500 ohm 0 15 96 1000 ohm 0 3 96 5000 ohm 1 45 96 Page 13 of 59 Peekel Instruments User manual PICAS V2 6 1 2 2 Analog inputs on CAAAI The analog DC inputs are located on the CA4AI card which can be ordered as a alternative for a CA2CF card which has 2 carrier frequency channels At the back side of PICAS for each CAAAI card 4 detachable screw terminals with each 6 terminals are present on which the signals sensors can be connected Also each CA4AI cards holds another detachable screw terminals with 2 terminals On this terminals an 24VDC 80mA power supply is present which can be used as a power supply for electronic sensors Figure 10 Backside of PICAS with 1 CA2CF card and 1 CA4Al card Page 14 of 59 Peekel Instruments User manual PICAS V2 6 1 2 2 1 Analog input connector pinout The following signals are present on the input connector pin1 Supply voltage or current pin2 supply current pin3 IN Input pin4 IN Input pind Supply
59. se resistors are stable and in balance The value of a quarter bridge completion resistor however should fairly accurately match the external straingauge otherwise a too large unbalance offset will be the result All drawings show dotted lines connecting the SE with the Ex lines These are the sense lines and must be connected even when not 6 but only 4 wires to the straingauge bridge are used The drawings include polarity signs within the straingauge resistors These indicate the polarity of the amplifier output signal for increasing strain and increasing resistance It is strongly recommended to use shielded cables 2 1 2 About Cable capacitance A topic inherent with the use of CF amplifiers contrary to DC amplifiers is cable capacitance The capacitance between cables to a straingauge bridge yields a parasitic impedance parallel to the arms of the Wheatstone bridge Any unbalance in capacitance may therefore lead to errors in the measured signal This becomes crucial in quarter bridge configurations where the capacitance comes directly across one arm of the bridge Example every 1 meter cabling of 100 pF meter connecting a 120 Q bridge to a 5 kHz carrier frequency amplifier gives rise to 100 nu V V C signal offset The carrier frequency amplifier luckily does suppress this C signal by at least a factor 1000 However this works only if the amplifier is not overloaded by the C signal The C signal therefore should not be mo
60. sensor like a PT100 ii 16 2 2 4 Connection of a voltage signal ii 17 2 2 5 Connection of a 4 20 mA Sensor ii 17 2 2 6 Connection of a 0 20mA Sensor ui 18 2 2 7 Connection of a Thermocouple eleMent ii 18 2 3 QUiplts tana amas lito parara do a 19 2 3 1 Combined analog OUtput iii 19 2 3 2 Digital Qutputs 2 000 A a A i Y ra Or 19 2 3 3 Digital Opus eiii hereto ee tenti Ee t dee deed 19 2 4 Communication PONS viril e lei viel a rie eee tbe tape dee 20 2 4 1 S232 Int rfacas A icta e de abs cde bue eed DE NAR pe ra Pe wound ota danced ede 20 2 4 2 USB once etate ia iran 20 2 4 3 ASIS Mea ti A i ie iii ne dia 21 2 4 4 Rear panel connections i 22 2 4 5 Option Sum amp difference values enne 23 3 Setting up the instrument 24 3 1 General thailandese 24 3 1 1 POWO UD a ti m eR BO s E E 24 3 1 2 Presentation of NUMDEFS ii 24 3 1 3 GONVENUONS to otii Linea en doce Festus iden dalai 24 3 1 4 Settings Protections tee eect ducts ite sadica adas 25 3 2 Software Installationer ie tee latir 25 3 2 1 Loading new versions of firmware Updates sseenmn 25 3 3 Human Interfacing iii eee erat a se E e d a 25 3 3 1 Navigating the LCD display and the pushbuttons 25 3 3 2 EIGIOS
61. to the highest possible gain The value for Output V determines the output voltage when full scale input signals are applied It is thereby possible to match to data acquisition equipment connected to the amplifier output Most modern systems accept the 10 10 volt signals that PICAS delivers by default Note that the full scale output voltage as specified with Output V is not the same as the maximum output voltage Even when 5 volt full scale is chosen a maximum of 14 volt may arise on the output during overload conditions Page 47 of 59 Peekel Instruments User manual PICAS V2 6 1 3 6 5 CA2CF menu BALANCE This menu gives the offset adjustment of the sensor or strain gauges DEVICE 1 AUTO BALANCE execute CHANNEL 1 R BALANCE C BALANCE MENU UNIT BALANCE USE BALANCE 0 0577 V Controls and Functions Auto Balance execute R Balance provided by system or adjustable 100 0 100 0 and selectable pico milli C Balance provided by system or adjustable 10 0 10 0 and selectable pico milli Unit provided by system Use Balance selectable Yes No Functional Description If a sensor or strain gauge bridge is connected with known unbalance that unbalance value can be entered as balance That value is then electronically subtracted from the input signal in the amplifier The use of the input balance can temporarily be disabled by setting use balance to no The valu

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