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Summary of Contents for Peekel Instruments PICAS
- Page 1 User manual PICAS PEEKEL INSTRUMENTS B.V PEEKEL INSTRUMENTS GMBH INDUSTRIEWEG 161 BERGMANNSTRASSE 43 3044 AS ROTTERDAM 44809 BOCHUM 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...
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Page 2: Table Of Contents
Peekel Instruments B.V. User manual PICAS V2.6.1 Contents: Introduction..............4 Power..........................4 General ..........................5 The Carrier Frequency principle ..................5 General design principles ....................6 Connecting the instrument ........7 Carrier frequency inputs on CA2CF...................7 2.1.1 Connecting the Transducers....................7 2.1.2 About Cable-capacitance....................7 2.1.3 Bridgeconnector pinout ......................8 2.1.4... - Page 3 Peekel Instruments User manual PICAS V2.6.1 3.5.5 System-menu: Measuring Parameters ................38 3.5.6 System-menu: Datalog ....................39 3.5.7 System-menu: Password....................41 CA2CF channel menu’s ....................42 3.6.1 CA2CF -menu: GENERAL....................43 3.6.2 CA2CF -menu: SENSOR....................45 3.6.3 CA2CF -menu: STRAIN....................46 3.6.4 CA2CF -menu: RANGE ....................47 3.6.5 CA2CF -menu: BALANCE ....................48...
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Page 4: Introduction
Peekel Instruments User manual PICAS V2.6.1 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. -
Page 5: General
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 with a variety of Wheatstone bridge-based sensors. -
Page 6: General Design Principles
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. -
Page 7: Connecting The Instrument
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. -
Page 8: Bridgeconnector Pinout
Peekel Instruments User manual PICAS V2.6.1 2.1.3 Bridgeconnector pinout pin 1 : (-excitation) pin 2 : (+excitation) pin 3 : (+input) pin 4 : (-input) pin 5 : Gnd (ground) pin 6 : (-sense) pin 7 : (+sense) pin 8 :... -
Page 9: Full-Bridge
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 6Ω resistances in both the + as well as the - wire, connected to a 120Ω... -
Page 10: Half-Bridge
Peekel Instruments User manual PICAS V2.6.1 2.1.5 Half-bridge Figure 2 shows half-bridge configured straingauges. The ½-bridge completion-resistors are internally connected to - +SE -SE 9 polig male Sub D Connect cable screen to connector case. Figure 3: Half bridge, 3-wire, straingauge-connection... -
Page 11: Quarter-Bridge Using 2-Wires
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 mΩ of cabling-resistance in series with a 120Ω straingauge, will directly add 2 µV/V signal-offset, though in practical situations it is more likely to meet... -
Page 12: Displacement Transducers
Peekel Instruments User manual PICAS V2.6.1 A similar situation as with the ½-bridge connection method has appeared. Every 1 mΩ of difference in resistance, when using 120Ω straingauges, gives a change in signal-offset of 2 µV/V. This may be compensated internally by the balance circuit. However, the temperature-influence cannot be compensated for. -
Page 13: Potentiometer Connection
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: +SE -SE 9 polig male Sub D Connect cable screen to connector case. Figure 9: Potentiometer connection as a half bridge, 3-Wire The linearity of the measurement is influenced by the impedance of the potentiometer. -
Page 14: Analog Inputs On Ca4Ai
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 CA4AI card 4 detachable screw terminals with each 6 terminals are present, on which the signals/sensors can be connected. -
Page 15: Analog Input Connector Pinout
- Supply voltage (0V) pin 6 : Screen Ground (Pin 1 is on the left side of each terminal, when one is looking at the rear site of PICAS. to chassis Figure 11: Interne connection of the analog input Connection pinout of the Power-terminal:... -
Page 16: Potentiometer Connection
Peekel Instruments User manual PICAS V2.6.1 2.2.2 Potentiometer connection screen gnd Figure 13: Potentiometer connection 2.2.3 Connection of a resistor sensor like a PT100 screen gnd Figure 14: Resistor connection This connection diagram is used with a PT100 sensor. Page 16 of 59... -
Page 17: Connection Of A Voltage Signal
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 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. -
Page 18: Connection Of A 0-20Ma Sensor
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 Figure 16: 0 – 20 mA Sensor connection 2.2.7 Connection of a Thermocouple element... -
Page 19: Outputs
Peekel Instruments User manual PICAS V2.6.1 2.3 Outputs 2.3.1 Combined analog output pin 1 : Amplifier output 1 pin 2 : Amplifier output 2 pin 3 : Amplifier output 3 pin 4 : Amplifier output 4 pin 5 : Screen gnd... -
Page 20: Communication Ports
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. -
Page 21: Rs485 Interface
Cable screen should be connected to the connector case. Do not connect to pin 5! 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 22: Rear Panel Connections
Peekel Instruments User manual PICAS V2.6.1 2.4.4 Rear panel connections Rear panel of a PICAS with 4 Carrier frequency channels Rear panel of a PICAS with 2 Carrier frequency channels, 4 analog DC-channels and a USB interface. Page 22 of 59... -
Page 23: Option Sum & Difference Values
User manual PICAS V2.6.1 2.4.5 Option Sum & 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. -
Page 24: Setting-Up The Instrument
(+123.45 in this case). PICAS always presents its floating-point numbers using the suffixes p, n, µ, m, none, k, M, G and T, standing for: pico, nano, micro, milli, none, kilo, Mega, Giga and Tera. -
Page 25: Settings Protection
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... - Page 26 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.
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Page 27: Fields
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. - Page 28 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-> -keys switch the value-suffix or the physical unit suffix between p, n, µ, m, none, k, M, G and T for micro, milli, none, kilo, mega, giga en tera.
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Page 29: Measuring Display
The actual values are also presented in numbers, if there is room on 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. -
Page 30: Peak Value Display
Peekel Instruments User manual PICAS V2.6.1 3.4.2 Peak value display The peak value display has the following layout: Peak values DEVICE 1 Low Peak High Peak +01.789 +05.645 + 04.738 V -03.342 +09.786 + 08.734 V +04.536 +07.687 + 06.432 V +03.879... -
Page 31: Sum - Difference Value Display
+ 02.089 V On the right side the sum and difference values of channel 1 & 2 and channel 3 & 4 are displayed. In case of a 2 channel PICAS the values related to channel 3 & 4 are not displayed. -
Page 32: System-Menu's
Peekel Instruments User manual PICAS V2.6.1 3.5 System-menu’s SYSTEM menu structure (Overview) The device (or PICAS unit) with which the keyboard/display is communicating DEVICE 1 LANGUAGE : ENGLISH SYSTEM DEVICE ADDR : CARRIER FREQ : 5000 Hz System menu 1... -
Page 33: System Menu
Peekel Instruments User manual PICAS V2.6.1 DEVICE 1 DATALOGGING : INACTIVE SYSTEM CLEAR BUFFER : <execute> FACTOR : 10 msec. System menu: MENU CHANNEL 1 : DATALOG CHANNEL 2 : 0.0% CHANNEL 3 : CHANNEL 4 : DEVICE 1 Password :... -
Page 34: System-Menu: General
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... -
Page 35: System-Menu: Communication
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... -
Page 36: System-Menu: Actions
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>... -
Page 37: System-Menu: Memory
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. -
Page 38: System-Menu: Measuring Parameters
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... -
Page 39: System-Menu: Datalog
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. - Page 40 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.
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Page 41: System-Menu: Password
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. -
Page 42: Ca2Cf Channel Menu's
Peekel Instruments User manual PICAS V2.6.1 3.6 CA2CF channel menu’s CHANNEL menu structure (Overview) BRIDGE-VOLT : +5.0 DEVICE 1 SIGNAL MODE : NORMAL CHANNEL 1 POLARITY : NORMAL Channel menu 1 CALIBRATION : <execute> MENU BRIDGE LOAD : +120.0 GENERAL BRIDGE COMPL.:... -
Page 43: Ca2Cf -Menu: General
Peekel Instruments User manual PICAS V2.6.1 3.6.1 CA2CF -menu: GENERAL BRIDGE-VOLT : DEVICE 1 +5.0 SIGNAL MODE : CHANNEL 1 NORMAL POLARITY : NORMAL CALIBRATION : <execute> MENU BRIDGE LOAD : +120.0 GENERAL BRIDGE COMPL.: 1/1 BRIDGE +0.0577 PRESENTATION Default... - Page 44 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 50KΩ), 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.
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Page 45: Ca2Cf -Menu: Sensor
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... -
Page 46: Ca2Cf -Menu: Strain
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... -
Page 47: Ca2Cf -Menu: Range
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. -
Page 48: Ca2Cf -Menu: Balance
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 : +0.0 C-BALANCE : +0.0 MENU UNIT : BALANCE USE BALANCE : +0.0577... -
Page 49: Ca2Cf -Menu: Trips
(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. -
Page 50: Ca4Ai Channel Menu's
Peekel Instruments User manual PICAS V2.6.1 3.7 CA4AI channel menu’s Device Excitation : Channel Meas. Type : Voltage Presentation : Default Menu General: MENU General +00.006 Device Physic. unit : Channel Sensor max. : +100.0 Sensor min. : +0.0 Menu Menu Sensor Signal max. -
Page 51: Ca4Ai Menu: General
Peekel Instruments User manual PICAS V2.6.1 3.7.1 CA4AI menu: GENERAL Device Excitation : Channel Meas. Type : Voltage Presentation : Default MENU General +00.006 Controls and Functions Excitation selectable 5 V or 1 mA Meas. Type: selectable Voltage: 20mV – 10V Current: 5mA –... -
Page 52: Ca4Ai Menu: Sensor
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... -
Page 53: Ca4Ai Menu: Range
Peekel Instruments User manual PICAS V2.6.1 3.7.3 CA4AI menu: Range Device Range of : Meas. value Channel Range : 10 V Unit : Menu Range +00.006 Controls and Functions Range of selectable (Signal V/V / Sensor) Range selectable see table below. -
Page 54: Ca4Ai Menu: Tara
Peekel Instruments User manual PICAS V2.6.1 3.7.4 CA4AI menu: Tara Device Auto Tare : <execute> Channel Tare : +0.0 Unit : Menu Use Tare: Tare +00.006 Controls and Functions Auto-Tare <execute> Tare provided by system or adjustable (-100.0 ... + 100.0) and selectable (pico- /... -
Page 55: Ca4Ai Menu: Trips
Peekel Instruments User manual PICAS V2.6.1 3.7.5 CA4AI menu: Trips Device Trip va lue : Channel Hysteresis : Unit : M enu Trip control : Inactive Trips Act.period : +00.006 Controls and Functions Trip-Value editable (0000000...999999) Hysteresis editable (0000000...999999) Unit... - Page 56 Peekel Instruments User manual PICAS V2.6.1 Page 56 of 59...
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Page 57: Problem Resolving
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’. -
Page 58: Technical Specifications
Peekel Instruments User manual PICAS V2.6.1 5 Technical Specifications Carrier frequency inputs of the CA2CF-card General Typical accuracy class 0.1% Bandwidth (-3 dB) 2000 Hz Maximum cable length: 500m Sensor connection 2-, 3-, 4-, or 6-wire configurations Bridge supply (transformer-isolated) Supply voltage 0,5... - Page 59 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...
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