1. Introduction - Peekel Instruments
Contents
1. 16 3 3 Human PIRE 16 3 3 1 The LED sit hte ERR ORDRE 18 3 3 2 Navigating the LCD display and the pushbuttons 19 3 3 3 Les 20 3 3 4 Navigating the ComPanel Display at the PC 21 3 4 Measuring DIsplay eek cians aioe teeta teens 22 3 4 1 Actual value display 2 n ea tetas 22 3 4 2 Peak value display n eene e eg nete e RR nine 23 3 5 Syse 11 MSH S re era eia ERR VET DE I EM Ve Erie M ads 24 3 5 1 System menu 1 GENERAL ineinander keinen iota deben iind 25 3 5 2 System menu 2 COMMUNICATION eee nenne ennemis 26 3 5 3 System menu 3 ACtiONS 27 3 5 4 System menu 4 Memory ar 28 3 5 5 System menu 5 Measuring Parameters emm 29 3 6 CHanMe lM ru S 30 3 6 1 Channel menu 1 GENERAL 31 3 6 2 Channel menu 2 SENSOR2. EEA 11 2 2 4 Quarter bridge using 3 wires 11 2 2 5 Displacement Transducers 5555 12 2 2 6 Potentiometer connection 13 2 3 ur 14 2 3 1 Combined analog 0 1 1 14 2 3 2 Digital O tp ts 22 acc ede e dude 14 24 Communication ports e tee ade ME aad duit 15 2 4 1 35232 interface ix ete tat Rua ent 15 2 4 2 54685 interface t deae heme 15 2 4 3 Rear panel connections sss ener 16 3 Setting up the instrument 17 3 1 HTML 17 3 1 1 POWer UP ee 17 3 1 2 Presentation of 5 17 3 1 3 CONVENTIONS MM 17 3 2 Software Installatlon i aac toa a ice ae LR 18 3 2 1 Installing COMPANEL software 16 3 2 2 Loading new versions of firmware 70 1816
3. 5 5 32 3 6 3 Channel menu 3 5 5 5 3 34 3 6 4 Channel menu 4 35 3 6 5 Channel menu 5 8 36 3 6 6 Channel menu 62 TRIPS iatis ad aa 37 4 Technical Specifications 38 Page 2 of 38 Peekel Instruments B V User manual PICAS V2 1 Release date June 2001 J H Steeneveld Page 3 of 38 Peekel Instruments B V User manual PICAS V2 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 38 Peekel Instruments B V User manual PICAS V2 1 1 2 General PICAS is a carrier frequency measuring amplifier from PEEKEL Instruments B V It is designed to be used for high accuracy experimental and industrial measurements and can be used with a variety of Wheatstonebridge based sensors A variety of resistive straingauge con
4. EX EX EX SE SE IN 6 ol 9 polig ES male Sub D 9 5 Connect cable screen to EN EX 5 or connector IN Figure 9 Potentiometer connection as a half bridge 3 Wire Page 13 of 38 Peekel Instruments B V User manual PICAS V2 1 2 3 Outputs 2 3 1 Combined analog output 1 Amplifier output 1 O Seen against pin2 Amplifier output 2 UPISE 7 45 pin3 Amplifier output 3 Amplifier 1 19 pin4 Amplifier output 4 Amplifier 2 29 pins Screen gnd Amplifier 39 Ed Amplifier 46 ao pin7 roun pins Ground pin9 Ground O Through these connections all 4 outputs 0 10 V are continuously available They might be used for connecting an external multiplexer or other device Individual analog outputs For each of the 4 amplifiers the same output voltage 0 10 V is also available on the 4 BNC connectors at the rear of the cabinet O CJ 2 3 2 Digital Outputs kN Connection diagram for channel 1 The other channels 4 16 Se identical just use other pins Ch 1 20 Ch2 3 6 Ch 2 40 Pin 1 LOAD 3 50 lt 18 Ch3 60 AC or DC Max 48V 1 V 4 80 Pin 2 Imax 300 mA ee 14 of 38 Peekel Instruments B V User manual PICAS V2 1 2 4 Communication ports 2 4 1 RS232 interface This port can be used to connect a COM port of a PC which is runn
5. 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 straingauges The bridge factor is basically equal to the number of active straingauges in the bridge If applicable it can also be used for the correction of poisson effects in straingauges configurations When using half and quarterbridge 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 34 of 38 Peekel Instruments B V User manual PICAS V2 1 3 6 4 Channel menu 4 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 04 Output V RANGE 0 0577 V Controls and Functions Range of selectable Signal V V Sensor Strain
6. EX C 9 polig tg a male Sub D ae Connect cable screen E pin 5 or connector case IN Figure 5 Quarter bridge 2 wire straingauge connection The internal balance compensation range is 65 mV 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 5Q leadwire in series with a 120Q 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 uV V offset change for each in series with a 1200 straingauge Short and thick cabling is evidently necessary 2 2 4 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 74 bridge completion to this internal 74 bridge resistance Only the difference in leadwire resistance and connector contact resistance gives signal offset EX EX 1 4 SE SE E 1 4 9 polig male Sub D lw Connect cable screen eos pin 5 or connector case IN Figure 6 Quarter bridge 3 wire
7. 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 Hold 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 System menu 5 When a channel or system menu is displayed and the measure button is pressed the setting in System menu 5 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 If the Peak option is not running and the reset command is given the following display will be presented Tubi DEVICE Low Peak High Peak 04 738 V 52 22 Se 08 734 V 06 432 V EE Aes 09 089 V lt Reset gt 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 Page 23 of 38 Peekel Instruments B V User manual PICAS V2 1 3 5 System menu s SYSTEM menu structure Overview The device or PICAS unit with which the keyboard display is communicating CARRIER FREQ System menu 1 CF MASTER The field names and settings within a menu The cursor indicates
8. straingauge connection Page 11 of 38 Peekel Instruments B V User manual PICAS V2 1 A similar situation as with the 72 bridge connection method has appeared Every 1 mQ of difference in resistance when using 120Q straingauges gives a change in signal offset of 2 uV V This may be compensated internally by the balance circuit However the temperature influence cannot be compensated for Short and thick cabling is again highly recommended 2 2 5 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 i EX EX IN SE SE 6 o1 9 polig care male Sub D 9 75 Connect cable screen to L EX pin 5 or connector case IN Z Q IN IN Figure 7 Connection of a full bridge Ivat SE SE IN gt 5 9 polig ee male Sub D 9 LA Connect cable screen utl 5 9 Figure 8 Connection of a half bridge IN Page 12 of 38 Peekel Instruments B V User manual PICAS V2 1 2 2 6 Potentiometer connection A potentiometer can be connected as a half bridge 3 wire connection
9. 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 3 3 4 Navigating the ComPanel Display at the PC If an interface cable is connected between a PC and PICAS the COMPANEL software on your PC can be used to perform the same functions as described for the LCD display Both PC display and LCD display settings are always synchronized This is for both PICAS versions with display and pushbuttons or the LED version Changes in either display will always be reflected in the other In fact the ComPanel display is a direct copy of the PICAS display Operation of ComPanel is very much the same as operation of PICAS itself see above You can click with the mouse on a key on the screen as if you were pressing the same key on the PICAS frontpanel Some things are made easier though While editing a number or text if the cursor has to the correct position the normal number and character keys on the PC keyboard can be used The ESCAPE key simulates the CANCEL key on PICAS Browsing through the menu s as with the MENU keys can also be done with the combination of the alt and left right keys It is also possible to click in the display area on the position of the menu number or menu text at the left Clicking at the left of it decreases the menu and clicking at the right of it increases the men
10. DIGITAL I O ANALOG OUT_ INPUT 1 INPUT 2 EN E z INPUT 3 INPUT 4 Ex ES a m AV 4 j A amp em 3 COMMON OUT RS 232 RS 485 c D gt 6 6 sT D 230V 50HZ 1A Rear panel 4 channel PICAS DIGITAL I O ANALOG our INPUT 1 e INPUT 2 lt D COMMON OUT RS 232 a 85 485 _ 0 230V a 50HZ 1A Rear panel 2 channel PICAS Page 16 of 38 Peekel Instruments B V User manual PICAS V2 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 for a short time the display shows the PEEKEL Instruments logo after which it comes into 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 1 2345 or 12 345 or 123 45 where the plus sign might be replaced by the minus sign As an example values smaller than 1 0000 will be shown as 123 45 m where m stands for milli or 1 1000 Remember also that 123 45mV for example is the same as 0 12345V The mcan be und
11. RANGE 4 BALANCE 5 TRIPS 6 ACTIONS 7 MEMORY 8 9 0 SYSTEM SET MEAS lt EXP MEASURE EXP gt and all 4 output signals small in volts Shortcut to Channel menu 1 GENERAL decimal 1 when entering data Shortcut to Channel menu 2 SENSOR decimal 2 when entering data Shortcut to Channel menu 3 STRAIN decimal 3 when entering data Shortcut to Channel menu 4 RANGE decimal 4 when entering data Shortcut to Channel menu 5 BALANCE decimal 5 when entering data Shortcut to Channel menu 6 TRIPS decimal 6 when entering data Shortcut to System menu 2 ACTIONS decimal 7 when entering data Shortcut to System menu 3 MEMORY decimal 8 when entering data decimal 9 when entering data decimal 0 when entering data Shortcut to System menu 1 GENERAL decimal dot when entering data 8 8 or minus when entering data Shortcut to System menu 4 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 19 of 38 Peekel Instruments B V User manual PICAS V2 1 General At the LCD screen three different groups of displays can be shown SYSTEM menu s CHANNEL menus MEASURE display With the 5 SYSTEM menus the various settings of a DEVICE can be set With the 6 CHANNEL menu s the behavior o
12. STRAIN E MOD UNIT 0 0577 DEVICE 1 CHANNEL 1 MENU 04 RANGE 0 0577 DEVICE 1 CHANNEL 1 05 BALANCE 0 0577 DEVICE 1 CHANNEL 1 MENU 06 TRIPS 0 0577 30 of 38 BRIDGE VOLT PRESENTATION SENSOR RANGE PHYSIC UNIT SENSOR V V MEAS SENSOR N RANGE OF RANGE UNIT AMPLIF Vout AUTO BALANCE R BALANCE C BALANCE UNIT USE BALANCE TRIP VALUE HYSTERESIS UNIT TRIP CONTROL 5 0 NORMAL NORMAL lt execute gt 120 0 1 1 BRIDGE Default 10 0 k 1 0m lt execute gt NO 200 0 k N mm Signal V V 1 0m V V 10 0 lt execute gt 0 0 0 0 V V YES 890 k 2k kN HIGH SIGNAL Peekel Instruments B V User manual PICAS V2 1 3 6 1 Channel menu 1 GENERAL DEVICE 1 BRIDGE VOLT 450 CHANNEL 1 SIGNAL MODE NORMAL POLARITY NORMAL MENU 01 CALIBRATION execute GENERAL BRIDGELOAD 1200 40 0577 V BRIDGE COMPL 1 1 BRIDGE PRESENTATION Default 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 2 120Q 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 th
13. V 1V V Gain Demodulatoi control Detector Lowpass Analog OUT Phase 5 KHz exc ref The Processor Analog Excitation Analog amplifiers reference signals controls 1234 vy The blockdiagram shows the basic al elements of the central processor module 0 Further hardware Bees components Apart from the basic module PICAS cabinet further houses the power supply the Dioital Power LCD display module the front 5 onn ator with integrated pushbuttons and Communications a backpanel with various input and output connectors 5232 5485 Vin Optional frontpaneel Unstab 0 1234 00000000000000 Page 6 of 38 Peekel Instruments B V User manual PICAS V2 1 2 Connecting the instrument 2 1 Inputs 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 and bridge complementary resi
14. 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 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 If the Actual setting is selected the actual value of the selected channel will be presented on the PICAS display in a large font If Peak values is selected the low and high peak values of each channel will be presented on the display When PICAS is in measuring mode the presentation can be changed with the enter key Page 29 of 38 Peekel Instruments B V 3 6 Channel menu s User manual PICAS V2 1 CHANNEL menu structure Overview Channel menu 1 Channel menu 2 Channel menu 3 Channel menu 4 Channel menu 5 Channel menu 6 DEVICE 1 POLARITY MENU 01 CALIBRATION GENERAL BRIDGE LOAD 40 0577 v BRIDGE COMPL DEVICE 1 CHANNEL 1 MENU 02 SENSOR 0 0577 V DEVICE 1 K FACTOR CHANNEL 1 BRIDGE FACTOR USE E MODUL MENU 03 E MODULUS
15. 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 6 this trip status will be presented on the display as follows DEVICE 1 04 738 V 08 734TV 06 432 V 09 089 V CHANNEL 2 TRIPPED When this display is presented and the measure button is pressed again the peak value display will be presented Page 22 of 38 Peekel Instruments B V User manual PICAS V2 1 3 4 2 Peak value display The peak value display has the following layout DEVICE 1 Low Peak High Peak re 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 Reset 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
16. to indicate the relation with and EX Connecting to IN and EX to IN should give a positive but overload outputsignal tsE Sense ines for 6 wire connection of full bridges 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 Ya Quarter bridge completion resistor 120Q or 350Q precision resistor A single external straingauge can be completed by the internal resistors in the other bridge arms available through 4 The 74 bridge completion resistor is internally connected to EX With the settings a choice can be made between a 120 ora 350 internal compensation resistor Screen Gnd Screen ground At this pin the screen of the cable can be connected Internally in the Signalog 6000 a selection can be made to connect all the screen grounds to the earth pin of the power inlet or to connect those pins to an external ground pin Page 8 of 38 Peekel Instruments B V User manual PICAS V2 1 2 2 Sensor Connections 2 2 1 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 1209 bridge give a decrease in outputsignal of 9 1 This can be compensated by
17. 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 12Q of copperwire connected to a 120Q bridge will still give 0 04 C change in sensitivity Short thick cabling is therefore recommended EX EX tc SE SE 6 5 ol E HN SIGNAL gt IN o 9 polig male Sub D 9 J5 Connect cable screen to L EX pin 5 or connector case IN IN Figure 1 Full bridge 4 wire straingauge connection EX TEX CXXX SE EX SE SE 6 1 TIN lt SIGNAL IN 5 9 polig 9 o male Sub D 9 J5 Connect cable screen to E EX pin 5 or connector case SE IN IN Figure 2 Full bridge 6 wire straingauge connection Page 9 of 38 Peekel Instruments B V User manual PICAS V2 1 2 2 2 Half bridge Figure 2 shows half bridge configured straingauges The completion resistors are internally connected to IN EX EX EX SE SE 6 ol IN 9 polig male Sub D 9 IE Connect cable screen to L EX pin 5 or co
18. 000 Q Internal bridge completion e 22 bridge 2400 e bridge 1200 e bridge 350Q Sensing 6 wire discontinuous CPU controlled to compensate for voltage drop across cables Measuring input transformer isolated Ranges 5V excitation 100 uV 1 V V Input filter 500 Hz Maximum Common Mode Voltage 250 V Common Mode Rejection 50 Hz gt 120 dB Serial Mode Rejection gt 66 dB Capacitive input overload max 7x range permissible Special input filtering for noise reduction Balance control R balance main 65 mV V C Balance 120 bridge up to 10 nF User manual PICAS V2 1 Output Full scale voltage 10 V Protection long term shortcircuit allowed Maximum capacitive load 10 nF Maximum cable length 100 m 100 pF m Output Low pass filter Frequency 3 dB lt 2000 Hz Filter type 7 stage Butterworth 42 dB Octave Internal bridge completion 240 Ohms 1 2 bridge 120 Ohms 1 4 bridge On board micro controller A D converter resolution 16 bits Amplifier calibration by software and D A converters Synchronisation digital with other boards via coaxcable or via RS 485 connection Communications 1 x serial port RS 232 1 x serial port RS 485 Trip outputs 1 x per channel adjustable trip level Solid state switches If tripped output is conducting Maximum output Voltage 48VAC DC Maximum switch current 300 mA Power supply 230 VAC 10 50 Hz Dimensions Housi
19. Language can be toggled here between English German Deutsch and Dutch Nederlands If 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 RS485 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 frequences 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 25 of 38 Peekel Instruments B V User manual PICAS V2 1 3 5 2 Sys
20. Range adjustable 10 0 10 0 and selectable 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 straingauge 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 to the highest possible gain The value for Output V determi
21. User manual PICAS PEEKEL INSTRUMENTS B V PEEKEL INSTRUMENTS GMBH E E KE L INDUSTRIEWEG 161 BERGMANNSTRASSE 43 3044 AS ROTTERDAM 44809 BOCHUM INSTRUMENTS TEL 010741527 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 1 Contents 1 11 8 1 1 1 15 408 4 1 1 POW AA 4 1 2 esa 5 1 3 The Carrier Frequency principle 5 1 4 General design principles sess 6 2 Connecting the instrument 7 2 1 ue EM 7 2 1 1 Connecting the ee nennen 7 2 1 2 7 2 1 3 Bridgeconnector 8 2 2 Sensor Connections cea Te dan eaten 9 2 2 1 66 caus deci 9 2 2 2 H lt bridge ie ete dete bee e tee et qat 10 2 2 3 Quarter bridge using 2 wires
22. e 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 9896 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 Page 37 of 38 Peekel Instruments B V 4 Technical Specifications General Suitable for 2 3 4 or 6 wire connections Typical accuracy class 0 1 for bridge loads up to 1000 Q Bandwidth 3dB 2000 Hz Operating temperature 10 C 50 C Permissible cable length up to 500 m Bridge supply transformer isolated Voltage 0 5 V adjustable Voltage accuracy 0 05 Frequency 5000 Hz Frequency accuracy 1 Load 60 3
23. e transducer or straingauges Values from 0 5 5 volt are possible There is a 1096 margin to compensate cable losses when using 6 wire connections sensing This allows for e g 12 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 negat
24. ent spurious voltages which makes the measuring unreliable In the late 50 s PEEKEL already developed the Carrier Frequency principle for these applications where an 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 38 Peekel Instruments B V User manual PICAS V2 1 1 4 General design principles The following drawings only show the basic principles of the electronics as it is outside the scope of this user s manual to go in full detail Basically PICAS houses 4 identical amplifier circuits and one common processor circuit which controls the settings of these 4 amplifiers as well as the communication with the PC other devices etc The Amplifiers The drawing shows the evident advantage the two transformers fully isolating the measuring input from the rest of the system 125 uV
25. erstood 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 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 DOWN 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 Page 17 of 38 Peekel Instruments B V User manual PICAS V2 1 lt execute gt means that a command can be given by pressing the ENTER button after which the required command is then being e
26. ess 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 more 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 and 1 4 Page 7 of 38 Peekel Instruments B V User manual PICAS V2 1 2 1 3 Bridgeconnector pinout 1 EX excitation pin2 EX excitation pin3 IN input pin4 IN input pin5 Screen Gnd ground pin6 SE sense pin7 SE sense pin8 pin9 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 XEX 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 and IN XIN Differential input of the amplifier Like for the excitation the polarity signs wouldn t have a meaning if they weren t used
27. f each of the 4 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 4 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 485 bus these other DEVICES can be selected and displayed The next line shows the selected channel Each of the 4 channels is selected with the CHANNEL button The third line the first in the next box shows the active menu number 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 prin
28. figurations can be connected for experimental materials testing Loadcells can be connected for industrial weighing and force measurements LVDT s Linear Variable Differential Transformers can be used for measuring linear or angular displacements and also Capacitive Transducers can be connected The basic module comprises 4 identical galvanically isolated analog amplifiers with 4 separate outputs There is one common microprocessor which controls the amplifier settings and provides the communication of the 4 amplifiers with the outer world PICAS is a stand alone tabletop model with one basic module It can also be connected as one node station in a larger decentralized system by using the integrated RS 485 bus connection PICAS can be delivered in 2 versions 1 With a dumb front showing only a few LED s 4 per channel This version has to be operated from a PC running the COMPANEL software which simulates the LCD front and its pushbuttons 2 With an LCD front and pushbuttons This version can be operated stand alone without the use of an external PC 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 differ
29. gain by setting use balance to yes again When a sensor or straingauge 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 36 of 38 Peekel Instruments B V User manual PICAS V2 1 3 6 6 Channel menu 6 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 MENU 06 TRIP CONTROL HIGH SIGNAL TRIPS 0 0577 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 starts The trip valu
30. ing COMPANEL software The Baudrate can be selected with System Menu 02 pin1 pn2 RXD pin3 pin4 Pm pins Ground Ground 5 Seen against pin6 male contacts pin B TXD 3 pin8 RXD 26 ping EL 2 4 2 5485 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 te communication lines and the sync lines to avoid interferation between the communication and synchronization signals If not used sometimes the measuring might be disturbed 5 ESKA pin1 do not use this connection ie JJ pin2 Ground against female is f ze nig this contact Y contacts pin4 pind Signal Ground 29 6 DATA 9 58 pin7 SYNC 49 06 lsvNc pin8 DATA Signal Ground 50 ping SYNC VW rear side of PICAS Terminator Terminator plug plug Schematic view of a 4 PICAS network with terminator plugs Page 15 of 38 Peekel Instruments B V User manual PICAS V2 1 2 4 3 Rear panel connections
31. ive gain is entered the polarity will be on inverted mode The 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 Page 31 of 38 Peekel Instruments B V User manual PICAS V2 1 accuracy of the normal measurement Capacitive unbalance is mostly observed in quarter bridge configurations with several meters of cabling 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 interbal bridge complementation can be selected A selection can be made from the following options 1 1 bridge with this sselection a full bridge must be connected 2 bridge with this selection the internal 72 bridge is connected toe the IN pin The external 7 bridge must be connected to the IN pin 4 gt 1200 with this selection a 120 Q resistor is internally connected between
32. l 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 gt Note that you must deliberately save parameters before they can be recalled Changes in amplifier settings are not automatically stored gt 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 Page 28 of 38 Peekel Instruments B V User manual PICAS V2 1 3 5 5 System menu 5 Measuring Parameters This menu sets the presentation mode of the local display DEVICE 1 PRESENTATION AMPLIF Vout SYSTEM DISP TIME S 0 5 DISPLAY Actual MENU 05 RESET PEAK lt Execute gt MEAS PARMS PEAK OPTION Hold Controls and Functions Presentation selectable Signal V V Physic Unit Output V Disp Time s adjustable 0 1 5 0 Display selectable Actual Peak values Reset peak lt execute gt Peak option selectable Hold Runn Functional description The presentation parameter defines how measurements are presented on the local display or on ComPanel if you work from a PC When set to amplif Vout the value represents the outputvoltage of the amplifier When set to amplifier the value represents the inputsignal of the amplifier
33. nction is especially needed when a PICAS with an LED front is used as a slave system In such a PICAS the device number cannot be changed because there is no display Of course the device number can be changed with the COMPANEL software Page 26 of 38 Peekel Instruments B V User manual PICAS V2 1 3 5 3 System menu 3 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 lt execute gt SOURCE CHAN 01 MENU 0 CHANNEL 1 YES ACTIONS CHANNEL 2 YES CHANNEL 3 YES CHANNEL 4 YES Controls and Functions Choose Action selectable Calibration Copy Params Auto Balance Disable BAL Use Balance Action lt execute gt 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 hence you can have the instrument lt execute gt 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 Co
34. nes the output voltage when full scale inputsignals 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 Page 35 of 38 Peekel Instruments B V User manual PICAS V2 1 gt 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 3 6 5 Channel menu 5 BALANCE This menu gives the offset adjustment of the sensor or straingauges DEVICE 1 AUTO BALANCE execute CHANNEL 1 R BALANCE 0 0 C BALANCE 40 0 MENU 0 UNIT V V BALANCE USEBALANCE YES 0 0577 Controls and Functions Auto Balance lt execute gt 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 straingauge 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 value does not change and can be used a
35. ng 250 x 350 x 110 mm W x D x H Page 38 of 38
36. nnector case 7 IN Figure 3 Half bridge 3 wire straingauge connection EX EX poc E SE EX SE SE 6 ol IN ot 9 polig a male Sub D 9 5 Connect cable screen to TL EX 5 or connector case SE 7 c IN Figure 4 Half bridge 5 wire straingauge connection The connection of the 72 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 120 bridge gives 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 38 Peekel Instruments B V User manual PICAS V2 1 2 2 3 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 120Q straingauge will directly add 2 uV V signal offset though in practical situations it is more likely to meet several ohm s of resistance
37. on of the output signal It shows whether a measurement is operating well within its range or if an out of range signal might be expected Moreover the following general information is shown POWER green shows the instrument is ON COM red lights up if the instrument is communicating with the PC or through the RS485 bus Page 18 of 38 Peekel Instruments B V User manual PICAS V2 1 3 3 2 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 the devices if connected at the RS 485 bus display UP DOWN RIGHT LEFT 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 PEEKEL FOUR CHANNEL CARRIER FREQUENCY AMPLIFIER PICAS CANCEL to cancel a manually edited command e 00 V LIII Sensor Strain Range Balance Trips f Actions 2i lt EXP p Memory System SetMeas Measure S The example above shows the MEASURE display with one channel large in engineering units GENERAL 1 SENSOR 2 STRAIN 3
38. py 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 27 of 38 Peekel Instruments B V User manual PICAS V2 1 3 5 4 System menu 4 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 04 ACTION execute MEMORY 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 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 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 Channe
39. stors 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 these 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 O bridge to a 5 kHz carrier frequency amplifier gives rise to 100 uV V C signal offset The carrier frequency amplifier luckily does suppr
40. t that will generate sensor v v 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 t or N as unit and an Ivdt could have m meter as in centimeter millimeter as unit The sensor calibration can automatically be done with the meas sensor parameter If you press enter on this line a measurement is done and the result in V V is placed at the line sensor v v If you enter the value for sensor range under which physical condition the measurement was done you have obtained calibration values for this sensor Page 33 of 38 Peekel Instruments B V User manual PICAS V2 1 3 6 3 Channel menu 3 STRAIN This menu is specifically intended for using with experimental straingauge measurements If you measure a complete sensor like a load cell or an it is easier to use the sensor menu number 2 DEVICE 1 K FACTOR CHANNEL 1 BRIDGE FACTOR USE E MODUL MENU 03 E MODULUS STRAIN E MOD UNIT 0 0577
41. ted 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 3 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 Page 20 of 38 Peekel Instruments B V User manual PICAS V2 1 Adjustable fields require manually introduced numbers like BRIDGE VOLT in the GENERAL channel menu and can be set by pressing the ENTER key This will move the 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 lt EXP and EXP gt keys switch the value suffix or the physical unit suffix between n u m none k M G and T for micro milli none kilo mega giga en tera Use ENTER 16 accept this edited value or CANCEL to restore the previous value Notice that
42. tem menu 2 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 running the COMPANEL software which is connected via the RS 232 connection DEVICE 1 RS 232 SPEED 19200 BAUD SYSTEM RS 485 SPEED 19200 BAUD DEVICE nr2 00000000 MENU 02 DEVICE nr3 00000000 COMMUNICAT 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 second 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 This fu
43. the pin and the EX pin Just connect 1 1200 staingauge between the EX and the 74 pin to measure this straingauge 4 gt 350 with this selection a 350 Q resistor is internally connected between the pin and the EX pin Just connect 1 3500 staingauge between the EX and the pin to measure this straingauge 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 3 6 2 Channel menu 2 SENSOR This menu specifies the connected sensor like a load cell or a Ivdt If plain straingauges are used it is easier to use the straingauge menu number 3 DEVICE 1 SENSOR RANGE 10 0 k CHANNEL 1 PHYSICUNIT N SENSOR V V 1 0 MENU 02 MEAS SENSOR execute SENSOR 0 0577 Controls and Functions Sensor Range adjustable 10 000 gt gt gt 10 000 with selectable suffix pico Tera Physic Unit selectable N Nm Pa ppm psi t V V V bar C g G Hz inch lbs 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 lt execute gt Functional Description Page 32 of 38 Peekel Instruments B V User manual PICAS V2 1 Sensor range specifies the physical stimulus force displacemen
44. the selected field of the menu RS 232 SPEED 19200 BAUD RS 485 SPEED 19200 BAUD DEVICE nr2 00000000 DEVICE nr3 00000000 DEVICE nr4 00000000 Configure lt execute gt System menu 2 02 COMMUNICAT The menu type seleced either CHANNEL or SYSTEM System menu 3 CHOOSE ACTION ACTION SOURCE CHAN MENU CHANNEL 1 ACTIONS The menu number and its name System menu 4 System menu 5 DEVICE 1 SYSTEM DEVICE 1 CHANNEL ACTION MENU 05 MEAS PARMS Page 24 of 38 CHANNEL 2 CHANNEL 3 CHANNEL 4 CHOOSE ACTION SYSTEM SCOPE PRESENTATION DISP TIME S DISPLAY RESET PEAK PEAK OPTION CALIBRATION lt execute gt 01 YES YES YES YES STORE SETUP CHANNELS SETUP 1 lt execute gt AMPLIF Vout 0 5 Actual lt execute gt Hold Peekel Instruments B V User manual PICAS V2 1 3 5 1 System menu 1 GENERAL This menu is for the most general system settings DEVICE 1 LANGUAGE ENGLISH SYSTEM DEVICE ADDR 001 CARRIER FREQ 5000 Hz MASTER YES 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
45. u Selecting another channel number as normally done with the CHANNEL keys can also be done with the combination of the ctrl and left right keys It is also possible to click in the display area on left or right of the channel number Selecting a line or parameter as done with the up down keys on PICAS can also be done by just clicking with the mouse pointer on the line of interest The first click will make the cursor move to that line Values that could be changed by using the left right keys can now also be modified by clicking on the line or parameter while the cursor is at the same position Note how clicking on the left or right of the semicolon simulates the left right PICAS keys Page 21 of 38 Peekel Instruments B V User manual PICAS V2 1 3 4 Measuring Display To display the measurement values PICAS has 2 display layouts The first one will display the values of all the 4 channels or 2 channels on the left side of the display and the value of the selected channel in a large font on the right side of the display 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
46. xecuted 3 2 Software Installation 3 2 1 Installing COMPANEL software COMPANEL is the PC version of the LCD display and pushbutton panel of PICAS COMPANEL can be considered as a normal PICAS Installation of the COMPANEL software is extremely easy Just insert the floppydisk marked COMPANEL Installation diskette into the floppy drive of your PC and run the INSTALL program The rest is self explanatory 3 2 2 Loading new versions of firmware Updates New firmware versions are distributed on diskettes 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 The LED display A PICAS equipped with an LED frontpanel i e no LCD display and pushbuttons but only a few telltale LED s shall be operated from a PC by means of the COMPANEL software or as a next device communicating through the RS485 bus with an other PICAS which does have an LCD display and pushbuttons In order to still have some rough information at the front of such instrument which is usually positioned near the transducers each of the 4 channels are represented by a series of 4 LED s 90 10 10 90 This indication shall be interpreted as a very rough digital percentage of full scale indicati
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