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New PL & PL-P Series Instruction Manual

1. The correct fuse type in all cases is 20 x 5mm 250V HBC time lag with the following rating 230V operation 1 6A T 115V operation 3 15A T Make sure that only fuses with the required current rating and of the specified type are used for replacement The use of makeshift fuses and the short circuiting of fuse holders are prohibited Mains Lead Connect the instrument to the AC supply using the mains lead provided Should a mains plug be required for a different mains outlet socket a suitably rated and approved mains lead set should be used which is fitted with the required wall plug and an IEC60320 C13 connector for the instrument end To determine the minimum current rating of the lead set for the intended AC supply refer to the power rating information on the equipment or in the Specification WARNING THIS INSTRUMENT MUST BE EARTHED Any interruption of the mains earth conductor inside or outside the instrument will make the instrument dangerous Intentional interruption is prohibited Mounting This instrument is suitable both for bench use and rack mounting A rack kit for mounting in a 19 rack is available from the Manufacturers or their overseas agents Ventilation The power supply is cooled by an intelligent multi speed fan which aids vertical convection Take care not to restrict the air inlets underneath or the vents on the top When rack mounted allow adequate space above and below the instrument and or use a fan
2. Independent Mode Tracking Mode Tracking Accuracy Ratio Tracking Mode Tracking Accuracy Parallel Mode Both On Both Off For any load change measured at the output terminals using remote sense Voltage lt 0 01 2mV Add typically 2 5mV for a 0 5V drop in the positive output lead Specification applies for sense lead resistance 0 50 Current typically 0 0196 500uA Voltage 0 0196 2mV for 10 line change Current 0 0196 250uA for 10 line change Voltage typically 50ppm 0 5mV C Current typically 100ppm 1mA C 100ppm 0 1mA C on 500mA range Output will withstand forward voltages of up to 20V above rated output voltage Reverse protection by diode clamp for currents up to 3A Output trips off for over temperature Measure and compare over voltage and over current protection are implemented in firmware and can be set via the remote interfaces only Output trips off for OVP and OCP Setting resolution 10mV and 1mA Response time typically 500ms For manual operation Local mode OVP and OCP are fixed at 105 of the instrument range maximum Dual 4 digit meters 10mm 0 39 LED Resolution 10mV Accuracy x 0 196 of reading 10mV Resolution 1mA 0 1mA on 500mA range Accuracy 0 396 3mA to 3A 0 596 3mA to 6A 0 396 0 3mA on 500mA range Selects a 2s time constant normally 20ms for averaging of rapidly varying load currents
3. THURLBY THANDAR INSTRUMENTS New PL amp PL P Series 8 1 1L Precision Linear DC Power Supplies INSTRUCTION MANUAL Table of Contents Introduction 2 Specification 3 EMC 7 Safety 8 Installation 9 Connections 10 Manual Operation 13 Remote Analogue Control Single programmable models only 20 Remote Interface Operation 23 Remote Commands 33 Maintenance 38 Introduction The New PL Series is a power supply series designed to replace the original PL Series which has become an industry standard product in many countries across the world The New PL Series retains the key aspects of its predecessor including Linear regulation for ultra low output noise and fast transient recovery High accuracy four digit fixed resolution meters True analogue controls for quick and intuitive adjustment of voltage and current DC output switch to check settings before applying them Remote voltage sensing for exceptional load regulation Current meter averaging to reduce jitter with rapidly varying load currents The New PL Series also adds some new and important features including High power density up to 90 watts from an ultra compact 3U 4 rack case size Significantly higher energy efficiency than conventional linear regulated designs by using an advanced phase controlled pre regulator Low current range giving 0 1mA meter resolution and finer low current setting V Span allows the user to redefine the end stop values of the volt
4. Register a value of 2 to be placed in the Query Error Register and the response formatter to be reset thus clearing the output queue The parser will then start parsing the next PROGRAM MESSAGE UNIT from the input queue See the Status Reporting section for further information GPIB Parallel Poll Complete parallel poll capabilities are offered on this instrument The Parallel Poll Enable Register is set to specify which bits in the Status Byte Register are to be used to form the ist local message The Parallel Poll Enable Register is set by the PRE lt nrf gt command and read by the PRE command The value in the Parallel Poll Enable Register is ANDed with the Status Byte Register if the result is zero then the value of ist is 0 otherwise the value of ist is 1 The instrument must also be configured so that the value of ist can be returned to the controller during a parallel poll operation The instrument is configured by the controller sending a Parallel Poll Configure command PPC followed by a Parallel Poll Enable command PPE The bits in the PPE command are shown below Parallel poll enable Was 0 sense of the response bit 0 low 1 high Example To return the RQS bit bit 6 of the Status Byte Register as a 1 when true and a 0 when false in bit position 1 in response to a parallel poll operation send the following commands PRE 64 lt pmt gt then PPC followed by 69H PPE The parallel poll response from the instrument
5. of the rated output voltage and current high range only generate OV to 5V at the rear panel Vou and lout terminals with respect to COM COM is connected to the positive output lut always corresponds to the set current whether the output is on or off but Vout goes to OV when the output is off Parallel Operation in Master Slave Configuration Parallel operation in Master Slave configuration permits higher output currents to be realised with equal current sharing between units and control of both voltage and current from a single unit All units should be of the same type i e same rated output voltage and current The diagram shows 3 units connected in parallel For equal current sharing each unit must be independently connected to the load with pairs of wires of equal gauge and length to ensure equal voltage drops Connect the Vs and lout of the master to the CV and CC inputs of the slaves set CV and CC switches to Remote as shown Note Do not make connections to the COM inputs of the slaves because these are already linked to the master via the positive output connections The voltage and current of the master can be set by either the front panel controls via the digital interface or by an external voltage applied to its own CV and CC analogue control inputs Parallel Operation in Master Slave Configuration Notes 1 Units can be wired for CV constant voltage CC constant current or both both shown Set CV and or CC switc
6. ADDITIONAL SPECIFICATIONS PL303QMD QUAD MODE DUAL Each output is fully independent and isolated Operation is equivalent to two single power supplies The two outputs remain isolated but the Slave voltage controls are disabled and the Slave voltage is set equal to the Master voltage Slave voltage Master voltage 0 1 of Master voltage 10mvV As tracking but the Slave voltage controls set an output voltage between 0 and 101 of the Master voltage Once set varying the Master voltage will create the same percentage change in the Slave voltage setting change in Slave voltage change of Master voltage 0 1 x10mV The Master output operates as a single output power supply with twice the current capability 0 2mA to 6A The Slave is disabled and its displays are turned off Each output has an independent DC On Off control these additional keys can be used to turn both outputs on or off simultaneously These keys operate in all four modes ANALOGUE REMOTE CONTROL Single PL P models only Non isolated inputs and outputs to set voltage and current limit Control input and output scaling Control input accuracy Control output accuracy Remote Off Rear panel control inputs CV and CC permit external OV to 5V or 0 to10V signals to set 0 to 100 of rated output voltage and current Set values of 0 to 100 of rated output voltage and current generate 0 to 5V signals at the rear panel Vout and lout outputs T
7. Current Meter Averaging Efficiency The current limit control can be set to limit the continuous output current to levels down to 1mA 0 1mA on 500mA range However in common with all precision bench power supplies a capacitor is connected across the output to maintain stability and good transient response This capacitor charges to the output voltage and loading of the output will produce a current pulse as the capacitor discharges which is independent of the current limit setting To reduce the measurement jitter with rapidly varying load currents a 2 second time constant can be selected by pressing the METER AVERAGE key the indicator beside the key lights when meter averaging is selected Press the key again to CANCEL meter averaging and return to the standard 20ms time constant The power supply minimises dissipation by using electronic line frequency pre regulation to maintain a low overhead voltage to the output regulators In addition to optimise operation at extremes of line input voltage and DC output power the transformer secondary is intelligently tap changed by a relay Hysteresis is used at the threshold point to prevent unnecessary switching when the output is set at about that level Apart from an audible click the user will be unaware that the relay has switched there will be no disturbance on the output Programmable models use special transformers which do not require relay tap changing Connection to the Load Th
8. PC s web browser and display the Home page of that device There are also tools for LAN discovery included as part of the National Instruments Measurement and Automation Explorer package and the Agilent Vee application The unit will when first powered up attempt to obtain settings via DHCP if available or if DHCP times out 30 seconds via Auto IP In the very unlikely event that an Auto IP address cannot be found a static IP address of 192 168 0 100 is assigned If a connection is still not made the instrument will flash LAn Err in the display see LAN Error section for details Web Server Configuration Password Protection The unit contains a basic web server This provides information on the instrument and allows it to be configured The Configure page can be password protected to deter unauthorised changes to the remote operation configuration the default configuration is no password The Configure page itself explains how to set the password The password can be up to 15 characters long note that the User Name should be left blank The password will however be reset to the default no password if the rear panel LAN RESET switch is used to reset all the LAN parameters to their factory default The web pages also have an Identify function which allows the user to send an identifying command to the instrument which causes its display to flash until the command is cancelled ICMP Ping Server The unit contains an ICMP
9. Set the ratio of output 2 slave to output 1 master in tracking mode to lt nrf gt where lt nrf gt is the ratio in percent 0 to 100 Query the ratio of output 2 slave to output 1 master in tracking mode The response is lt nrf gt where lt nrf gt is the ratio in percent 0 to 100 System and Status Commands CLS EER ESE lt nrf gt ESE ESR IST OPC OPC PRE lt nrf gt PRE QER RST 36 Clear Status Clears the Status structure This indirectly clears the Status Byte Register Query and clear Execution Error Register The response format is nr1 rmt Set the Standard Event Status Enable Register to the value of lt nrf gt Returns the value in the Standard Event Status Enable Register in lt nr1 gt numeric format The syntax of the response is lt nr1 gt lt rmt gt Returns the value in the Standard Event Status Register in lt nr1 gt numeric format The register is then cleared The response is nr1 rmt See Status Reporting section for details Returns ist local message as defined by IEEE Std 488 2 The syntax of the response is O rmt if the local message is false or 1 lt rmt gt if the local message is true Sets the Operation Complete bit bit 0 in the Standard Event Status Register This will happen immediately the command is executed because of the sequential nature of all operations Query Operation Complete status The response is always 1 rmt an
10. error encountered 1 9 Internal hardware error detected 100 Range error The numeric value sent is not allowed This includes numbers that are too big or too small for the parameter being set and non integers being sent where only integers are allowed 101 A recall of set up data has been requested but the store specified contains corrupted data This indicates either a hardware fault or a temporary data corruption which can be corrected by writing data to the store again 102 A recall of set up data has been requested but the store specified does not contain any data 29 103 Attempt to read or write a command on the second output when it is not available Typically this will occur if attempting to program the second output on single channel instruments or on a two channel instrument which is set to parallel mode 104 Command not valid with output on This is typically caused by using the IRANGE n command without first turning the output off 200 Read Only An attempt has been made to change the settings of the instrument from an interface without write privileges see the Interface Locking section Limit Event Status and Limit Event Status Enable Registers For single output power supplies there is one Limit Event Status Register for dual power supplies except if operating in parallel mode there are two These are read and cleared using LSR1 and LSR2 respectively On power up these registers are set to 0 t
11. indicator is also flashed If the output is also on when these actions are attempted the message turn oFF is first shown in the display accompanied by the output indicator flashing followed by the message Unloc with the LOCK indicator flashing The LOCK status at power on is the same as at last power off Using Voltage Span 16 The VOLTAGE SPAN V Span capability allows the end stop values of the VOLTAGE controls to be redefined by the user such that the controls operate within a specific narrower voltage range This not only has the advantage of protecting against the accidental application to the load of voltages outside of the range but also provides high resolution analogue control over the specified voltage range using the full 300 rotation of the voltage controls V Span is turned on or off with the ENABLE key The ENABLE lamp is lit when V Span is selected The factory default is Vmin 3V Vmax 5V Because turning V Span on will always change the output voltage it can only be enabled or cancelled with the output off If attempts are made to enable or cancel V Span with the output on the display will briefly show the message turn oFF to prompt the user to turn the output off To set new values for Vmin or Vmax the V Span function must be off cancelled The lower voltage limit is defined by using the MAIN and FINE VOLTAGE controls to set exactly the required value the Vmin key is then held pressed until the left ha
12. rear panel connections of the programmable units are shown below A CM LN Remote Local Remote Local RS232 USB O LAN RESET umo ELECTRIC SHOCK IEEE 488 LINE REMOVING LID O REFERTO _ C ZN MANUAL N A of Jo OoOo00 0000 O IEEE 488 O 9 LAN RS232 tM USB SENSE OUTPUT SENSE OUTPUT MASTER SLAVE O O P 1 O P 2 Main Output and Sense Terminals all Programmable models The Output and Sense terminals are duplicated on the rear panel terminal block marked Output Output Sense and Sense space restrictions on the single units limit the markings to S and S in the group marked OUT These connections are paralleled with their front panel equivalents Switch the LOCAL REMOTE switch to REMOTE when remote sensing is required When the rear panel Output terminals are used the use of remote sense is always recommended to ensure that output regulation is maintained within specification connections can be made to either the front or the rear remote sense terminals but never to both pairs of terminals at the same time Switch back to LOCAL when remote sensing is not in use Analogue Remote Control Single Programmable models only A Connections CV and CC provide analogue control of the Output Voltage and Current Limit respectively when slide switches CV and CC are set to Remote The input scalin
13. set the output beyond 105 of the range maximum Practical Considerations when using CV and CC The stability of the control voltages directly affects the stability of the output Any noise on the control signals will generate noise on the output To minimise noise on the output connect the control voltages to the CV CC and COM inputs using twisted or screened pairs screens grounded at one end only and keep the connections as short as possible The diagrams below show the connections for Constant Voltage CV and Constant Current CC control using an external voltage Constant Voltage Control Note that when the OUTPUT is on the instrument s display always shows the actual output voltage and current whichever control source is active However when the OUTPUT is off the display will show the preset voltage and current set by the front panel controls or the digital interface if active and not the values determined by the CV and CC inputs even if they have been made active CV and CC set to Remote To avoid confusion it is good practice to set the front panel controls to minimum when remote CV and CC are used 21 Analogue Out Control Voltages Analogue Out control voltages Vout and lout are generated from the actual internal control voltages for which the active source can be the front panel controls the digital interface RS232 USB LAN or GPIB or the remote analogue inputs CV and CC Vou and lout are scaled such that 0 to 100
14. source current and cannot sink it thus units cannot be series connected in anti phase The unit can be connected in parallel with others to produce higher currents Where several units are connected in parallel the output voltage will be equal to that of the unit with the highest output voltage setting until the current drawn exceeds its current limit setting upon which the output will fall to that of the next highest setting and so on In constant current mode units can be connected in parallel to provide a current equal to the sum of the current limit settings Protection The output has intrinsic short circuit protection and is protected from reverse voltages by a diode the continuous reverse current must not exceed 3 Amps although transients can be much higher If the applied reverse voltage can source more current than the set current limit and the output is on then the output will go into current limit the CC indicator will flash and its display will show the reverse voltage across the protection diode if the output is off just the CC indicator will flash In common with all series regulated single ended power supplies the unit is not capable of sinking current provided from an external source If a voltage greater than the set output voltage of the unit is applied from an external source the internal regulator will turn off and no current will flow if the output is turned on the voltage meter will read the applied voltage No dam
15. temperature condition ends The set voltage and current limit are always shown when the output is off but can also be viewed when the output is on by pressing the VIEW key the SETTINGS indicator is lit whilst the VIEW key is pressed Lock Settings Pressing the LOCK key digitally locks the set voltage and current limit The settings are stored with a precision of better than 1 digit Subsequent adjustments of the VOLTAGE and CURRENT controls will have no effect Because cancelling LOCK will cause the output settings to change if the VOLTAGE and CURRENT control positions have been moved warning reminders are given before LOCK is cancelled Press and hold the key to cancel LOCK If the OUTPUT is off the safe condition the display will flash the unlocked settings twice before the change is implemented the LOCK lamp goes off If the output is still on OP on output on will flash twice in the display followed by flashing of the new unlocked settings for 2 3 seconds slowly at first then faster before the change is finally implemented the LOCK lamp goes off when the change is made Releasing the LOCK key at any time while the display is flashing will abort the LOCK cancellation Attempting to change the current limit range see Setting up the Output section or the voltage span limits see Voltage Span section with LOCK enabled is not allowed if attempted the message Unloc is shown briefly in the display and the LOCK
16. to read TCPIP0 192 168 1 100 9221 SOCKET where 9221 is the TCP port used by this instrument for control and monitoring see below XML Identification Document URL As required by the LXI Standard the instrument provides an XML identification document that can be queried via a GET at http lt hostname gt 80 Ixi identification that conforms to the LXI XSD Schema available at http www xistandard org Instrumentidentification 1 0 and the W3C XML Schema Standards http www w3 org XML Schema This document describes the instrument TCP Sockets The instrument uses 2 sockets on TCP port 9221 for instrument control and monitoring Text commands are sent to this port as defined in Remote Commands and any replies are returned via the same port Any string must be one or more complete commands Commands may be separated with either semicolons or line feeds No terminator is required since the TCP frame contains complete commands though commands may be sent with a terminator if desired it will be ignored Each command over TCP behaves as if it is terminated with a command terminator ASCII character OAH line feed LAN Error If a LAN connection is made but an error is detected e g the IP address is the same as another device on the network then the instrument s display will flash alternately between the normal voltage and current values and LAn Err until the error is corrected If a LAN error occurs check and correc
17. will install the appropriate driver and establish a virtual COM port within the PC The number of the new COM port will depend upon the number of co existing COM ports within the PC The virtual COM port can be driven by Windows applications in exactly the same way as a standard COM port except that the Baud rate setting of the virtual COM port is ignored The driver will remain installed on the PC so that the establishment of a virtual COM port is done automatically each time the instrument is connected to the PC via USB in the future Further virtual COM ports are created for each additional instrument connected to the PC via USB Each instrument is assigned a separate virtual COM port when it is first connected and the same COM port will be assigned each time that instrument is subsequently connected the PC software makes use of the unique code embedded in each instrument to link it to the same virtual COM port irrespective of which physical USB port it is connected to Use can also be made of the ADDRESS command to easily identify which instrument is being controlled by a particular COM port Although the addressing capability is ignored in USB operation the address can still be set and used as an identifier set each USB connected instrument to a different address and send the ADDRESS command from each virtual COM port to confirm which instrument is connected to that port LAN Interface The LAN interface is designed to comply with the LXI
18. will then be OOH if RQS is 0 and 01H if RQS is 1 During parallel poll response the DIO interface lines are resistively terminated passive termination This allows multiple devices to share the same response bit position in either wired AND or wired OR configuration see IEEE 488 1 for more information 28 Status Reporting A separate error and status model is maintained for each interface instance an interface instance is defined as a potential connection USB RS232 and GPIB are inherently single connections so represent one interface instance each LAN however allows for multiple simultaneous connections and therefore represents multiple interface instances Two interface instances are allocated to the two TCP socket interfaces and one more is allocated to the Web page interface Having a separate model for each interface instance ensures that data does not get lost as many commands e g ESR clear the contents on read Error status is maintained using a set of registers these are described in the following paragraphs and shown on the Status Model at the end of this section Standard Event Status and Standard Event Status Enable Registers These two registers are implemented as required by the IEEE Std 488 2 Any bits set in the Standard Event Status Register which correspond to bits set in the Standard Event Status Enable Register will cause the ESB bit to be set in the Status Byte Register The Standard Event Status Register i
19. 560VA max 5 C to 40 C 20 to 80 RH 40 C to 70 C Indoor use at altitudes up to 2000m Pollution Degree 2 Intelligent variable speed low noise fan assists convection Over temperature trip shuts down output if internal temperatures exceed predetermined thresholds Complies with EN61010 1 Complies with EN61326 Single 107mm x 131mm rack 3U x 288mm L PL P 343mm L excluding feet knobs and terminals Dual 214mm x 131mm 75 rack 3U x 288mm L excluding feet knobs and terminals Single 4 5kg PL P 4 9kg Dual 8 5kg EC Declaration of Conformity We Thurlby Thandar Instruments Ltd Glebe Road Huntingdon Cambridgeshire PE29 7DR England declare that the PL amp PL P Series Precision Power Supplies with GPIB Option meet the intent of the EMC Directive 2004 108 EC and the Low Voltage Directive 2006 95 EC Compliance was demonstrated by conformance to the following specifications which have been listed in the Official Journal of the European Communities EMC Emissions a EN61326 1 2006 Radiated Class B b EN61326 1 2006 Conducted Class B c EN61326 1 2006 Harmonics referring to EN61000 3 2 2006 Immunity EN61326 1 2006 Immunity Table 1 referring to a EN61000 4 2 1995 Electrostatic Discharge b EN61000 4 3 2006 Electromagnetic Field c EN61000 4 11 2004 Voltage Interrupt d EN61000 4 4 2004 Fast Transient e EN61000 4 5 2006 Surge f EN61000 4 6 2007 Conducted RF Perfo
20. 88 2 Error Handling Query Error Register The IEEE 488 2 UNTERMINATED error addressed to talk with nothing to say is handled as follows If the instrument is addressed to talk and the response formatter is inactive and the input queue is empty then the UNTERMINATED error is generated This will cause the Query Error bit to be set in the Standard Event Status Register a value of 3 to be placed in the Query Error Register and the parser to be reset See the Status Reporting section for further information The IEEE 488 2 INTERRUPTED error is handled as follows If the response formatter is waiting to send a response message and a PROGRAM MESSAGE TERMINATOR has been read by the parser or the input queue contains more than one END message then the instrument has been INTERRUPTED and an error is generated This will cause the Query Error bit to be set in the Standard Event Status Register a value of 1 to be placed in the Query Error Register and the response formatter to be reset thus clearing the output queue The parser will then start parsing the next PROGRAM MESSAGE UNIT from the input queue See the Status Reporting section for further information The IEEE 488 2 DEADLOCK error is handled as follows If the response formatter is waiting to send a response message and the input queue becomes full then the instrument enters the DEADLOCK state and an error is generated This will cause the Query Error bit to be set in the Standard Event Status
21. 9600 the other parameters are fixed as follows Start Bits 1 Parity None Data Bits 8 Stop Bits 1 RS232 Character Set Because of the need for XON XOFF handshake it is possible to send ASCII coded data only binary blocks are not allowed Bit 7 of ASCII codes is ignored i e assumed to be low No distinction is made between upper and lower case characters in command mnemonics and they may be freely mixed The ASCII codes below 20H space are not used In this manual 20H etc means 20 in hexadecimal The unit will send XOFF when there are 50 free bytes remaining and XON when this increases to 100 bytes USB Interface The USB interface is a virtual COM port which can be controlled by a PC as if it was a RS232 device The instrument is supplied with a CD containing an inf file for the standard Microsoft drivers available in Windows 2000 XP Vista and Windows 7 the installation wizard will install the driver 32 bit or 64 bit appropriate to the PC s operating system Any updates are available via the TTi website www tti test com Installation of the interface driver is achieved by connecting the instrument to a PC via a standard USB cable The Windows plug and play functions should automatically recognise the addition of new hardware attached to the USB interface and if this is the first time the connection has been made prompt for the location of a suitable driver Provided that the standard Windows prompts are followed correctly Windows
22. D TO CANCEL CANCEL CANCEL VOLTAGE CURRENT mY ALS AL MAIN FINE A 4 l Vmin DUX Vmax DM s f VOLTAGE SPAN FRONT PANEL VIEW NORMEN Wick E OUTPUT l d d O Ex Oo HOLD TO SET CANCEL CLA or OL OG 300V pk max io LOCAL REMOTE POWER 2 SENSE T T yay PL303QMD QUAD MODE DUAL POWER SUPPLY 30V 3A 6A i REMOTE ecc SETTINGS ecc SETTINGS f a Juuu J U U FUL 4700 f V mA mA i VIISETTINGS METER 500mA VIISETTINGS METER 500mA l VIEW LOCK AVERAGE RANGE VIEW LOCK AVERAGE RANGE C C Jo C Jo Jo Ez C Jo Coo Jo i LOCAL HOLD TO CANCEL CANCEL CANCEL HOLD TO CANCEL CANCEL CANCEL VOLTAGE CURRENT rS oN VOLTAGE CURRENT 1 x AH N l 1 f oe cy OFF A SY Y Se i i Vmin Vmax 100 Vmin Vmax i VOLTAGE SPAN p TRACKING VOLTAGE SPAN Vmin VIEW Vmax ENABLE OUTPUT Vmin VIEW Vmax ENABLE OUTPUT h O O O Il i HOLD TO SET CANCEL MODE HOLD TO SET CANCEL ITI 8 6 ISOLATED TRACKING 8 5 SE Y el INDEPENDENT e PARALLEL el Ko He 1 Ps 30V 6A gt Em A SLAVE MASTER b gt E 300Vpk LOCAL REMOTE 300Vpk LOCAL REMOTE i max tot SENSE TURN OUTPUTS OFF max to SENSE POWER WHEN CHANGING MODE 10 Rear Panel Connections Non programmable models have no rear panel connections The
23. HITE SPACE gt is ignored except in command identifiers e g C LS is not equivalent to CLS lt WHITE SPACE gt is defined as character codes OOH to 20H inclusive with the exception of the NL character OAH The high bit of all characters is ignored The commands are case insensitive Command List This section lists all commands and queries implemented in this instrument Note that there are no dependent parameters coupled parameters overlapping commands expression program data elements or compound command program headers each command is completely executed before the next command is started All commands are sequential and the operation complete message is generated immediately after execution in all cases The following nomenclature is used lt rmt gt lt nrf gt nr1 nr2 n RESPONSE MESSAGE TERMINATOR A number in any format e g 12 12 00 1 2 e1 and 120 e 1 are all accepted as the number 12 Any number when received is converted to the required precision consistent with the use then rounded to obtain the value of the command A number with no fractional part i e an integer A number in fixed point format e g 11 52 0 78 etc The number of the output 1 or 2 or associated status register to which the command relates On dual output supplies 1 is the Master right hand output and 2 is the Slave left hand output On single output supplies n is always 1 The commands wh
24. The default input voltage scaling is OV to 5V for 0 to 100 of the rated maximum current high range only The input voltage scaling can be changed to be OV to 10V by removing an internal shorting link Disconnect the instrument from the AC source and remove the cover as described in the Installation section Referring to the top view of the instrument shown in the drawing remove the tall shorting link in position LK3 Remote CC can be used with either Local or Remote CV CAUTION Do not apply external control voltages to either the CV or CC input that exceed the maximum for the set input range 5V or 10V The inputs are protected against excess voltages but the instrument will attempt to supply an output voltage or current in excess of its maximum rating if the control voltage exceeds its range limit with possible consequential damage If the condition persists OVP and or OCP may trip the output off see next section OVP and OCP OVP over voltage protection and OCP over current protection are implemented in firmware and can only be set and used when under remote control via the RS232 USB LAN LXI or GPIB interfaces Setting resolutions are 10mV and 1mA and typical response times are 500ms However in local mode OVP and OCP are still active but automatically default to 10596 of the instrument s range maximum This usefully provides shut down protection in the event of prolonged application of a CV or CC control voltage which attempts to
25. ace Operation section for further details This change of power on setting is retained until reversed by a NOLANOK 0 command or by the use of the rear panel LAN RESET switch to restore the factory default LAN setting see the LAN paragraph in the Remote Interface Operation section Note that the display messages do not affect the operation of the power supply itself At power on the factory default setting is for the output to be off The preset output volts and current will be determined by the present control settings and shown in the display All other settings will be the same as they were at last power off The dc output state at power on can be set to be always off or same as at last power off The setting can be changed as follows With the VIEW key held down press and hold down the OUTPUT key the display will first show the present setting for 1 second OP OFF if the factory default is still selected before flashing the new setting for 2 seconds LASt Set in this instance After 2 seconds the new setting is shown continuously in the display and the change is implemented release the OUTPUT and VIEW keys Repeating the procedure will change the setting back to the previous state Note that the power on status of the two outputs of the dual supply need to be set individually Output Control Setting Up the Output With the POWER switch on and the ZZz OUTPUT off the output voltage and current limit can be accurately
26. age control giving high resolution analogue control over the exact voltage range needed S Lock digitally locks voltage and current settings at the touch of a button Setting limits can be viewed at any time Safety binding post terminals are touch proof and uniquely accept fixed shroud 4mm plugs as well as standard plugs bare wires and fork connectors The New PL P Series is the programmable remote control version of the New PL Series and duplicates all of its manual control features RS 232 USB and LXI compliant LAN interfaces are fitted as standard Full bus interfacing permitting remote control and readback via either RS232 USB LAN LXI or GPIB IEEE 488 GPIB is a factory fitted option Simple command structures which make programming particularly easy regardless of which interface is used The commands are consistent with other TTi power supply families such as the QL P and the original PL P series making inter changeability straightforward All power supply settings can be controlled via the bus Voltage and current can be set to a resolution of 1mV or 0 1mA 0 01mA on the 500mA range Actual voltage and current can be read back together with the power supply status An IVI driver is supplied which provides support for common applications such as LabView LabWindows and Agilent VEE Single PL P models additionally offer remote analogue control of output voltage and current which can be used independently or in parallel ma
27. age will result providing the applied voltage does not exceed the maximum output voltage of the power supply by more than 20 Volts With the OUTPUT off the load is still connected to the power supply output stage the output voltage is simply set to zero Do not apply external voltages to the power supply terminals in excess of 20V above the rated output voltage even with the output off or damage may result 15 Over temperature Protection View Settings An internal sensor will detect over temperature due to blocked airflow fan failure or other circuit fault Over temperature will turn the output off the OUTPUT indicator will flash and the display will show the message OtP triP When the cause of the over temperature has been removed and the instrument has cooled down the output indicator will go off but the message OtP triP continues to show Pressing the OUTPUT key once will change the display to show the preset voltage and current the SETTINGS indicator will be lit but the output will remain off pressing it a second time will turn the output on normally If the OUTPUT key is pressed while the instrument is still over temperature OUTPUT indicator is flashing the message OtP triP is replaced by the preset voltage and current the SETTINGS indicator will be lit but the output will remain off each subsequent press of the OUTPUT key causes the OtP triP message to be displayed briefly but the output will remain off until the over
28. d by digital setting of the end stop values of the coarse voltage control to any desired values The range for Vmax is 0 1V to 15V 30V 60V depending on model The range for Vmin is 0 to Vmax 0 1V Voltage and current settings can be locked by a single button press Lock accuracy is equal to meter accuracy see Meter Specification Constant voltage or constant current with automatic cross over CC indicator lit in constant current mode Electronic non isolating Preset voltage and current limit displayed when Output is off Output rise time with no load 15ms Universal 4mm safety binding posts on 19mm 0 75 spacing for Output screwless terminals for Sense lt 50us to within 50mV of setting for a 90 load change Maximum time required for output to settle within 196 of its total excursion for resistive load Excludes command processing time Full Load No Load Full Load No Load Up 45ms 40ms Down 6ms 100ms Up 45ms 40ms Down 60ms 100ms Up 45ms 40ms Down 20ms 150ms Up 45ms 40ms Down 50ms 150ms Up 45ms 40ms Down 50ms 300ms Up 70ms 40ms Down 110ms 300ms Normal mode voltage lt 0 4mVrms and 2mVp p Normal mode current 0 2mArms 40uArms on 500mA range Common mode current lt 5uArms Load Regulation Line Regulation Temperature Coefficient Output Protection OTP Protection OVP and OCP Protection PL P models only METER SPECIFICATIONS Display Type Voltage Current Current Meter Average
29. d will be available immediately the command is executed because all commands are sequential Set the Parallel Poll Enable Register to the value lt nrf gt Returns the value in the Parallel Poll Enable Register in lt nr1 gt numeric format The syntax of the response is lt nr1 gt lt rmt gt Query and clear Query Error Register The response format is nr1 lt rmt gt Resets the instrument to the remote control default settings with the exception of all remote interface settings stored set ups Vmin Vmax values and Output state at power on setting see Remote Operation Defaults paragraph in the Remote Interface Operation section SRE lt nrf gt SRE STB WAI Set the Service Request Enable Register to lt nrf gt Returns the value of the Service Request Enable Register in lt nr1 gt numeric format The syntax of the response is lt nr1 gt lt rmt gt Returns the value of the Status Byte Register in lt nr1 gt numeric format The syntax of the response is lt nr1 gt lt rmt gt Wait for Operation Complete true As all commands are completely executed before the next is started this command takes no additional action Miscellaneous Commands IDN ADDRESS CONFIG DAMPING lt n gt lt nrf gt NOLANOK lt nrf gt TST TRG Error Messages Returns the instrument identification The exact response is determined by the instrument configuration and is of the form lt NAME gt lt model gt lt Serial No g
30. e load should be connected to the positive red and negative black OUTPUT terminals Both are fully floating and either can be connected to ground Remote Sensing 14 The unit has a very low output impedance but this is inevitably increased by the resistance of the connecting leads At higher currents this can result in significant differences between the indicated source voltage and the actual load voltage two 20mQ connecting leads will drop 0 2V at 5 Amps for instance This problem can be minimised by using short thick connecting leads but where necessary it can be completely overcome by using the remote sense facility This requires the sense terminals to be connected to the output at the load instead of at the source insert wires into the spring loaded SENSE terminals and connect directly to the load Switch the LOCAL REMOTE switch to REMOTE To avoid instability and transient response problems care must be taken to ensure good coupling between each output and sense lead This can be done either by twisting the leads together or by using coaxially screened cables sense through the inner An electrolytic capacitor directly across the load connection point may also be beneficial The voltage drop in each output lead must not exceed 0 5 Volts Switch the LOCAL REMOTE switch back to LOCAL when remote sensing is not in use Output Connection and Remote Sensing on Progra
31. essful or 1 if the lock is unavailable either because it is already in use or the user has disabled this interface from taking control using the web interface Query the status of the interface lock The return value is 1 if the lock is owned by the requesting interfaced instance 0 if there is no active lock or 1 if the lock is unavailable either because it is already in use or the user has disabled this interface from taking control using the web interface 35 IFUNLOCK LSR lt n gt LSE lt n gt lt nrf gt LSE lt n gt SAV lt n gt lt nrf gt RCL lt n gt lt nrf gt RATIO lt nrf gt RATIO Release the lock if possible This command returns the value 0 if successful If this command is unsuccessful 1 is returned 200 is placed in the Execution Register and bit 4 of the Event Status Register is set indicating that there is no authority to release the lock Query and clear Limit Event Status Register n The response is lt nr1 gt lt rmt gt See Status Reporting section for details Set the value of LSE lt n gt Limit Event Status Enable Register n to lt nrf gt Return the value of LSE lt n gt Limit Event Status Enable Register n response is nr1 rmt Save the current set up of output n to the set up store specified by lt nrf gt where lt nrf gt can be 0 9 Recall a set up for output lt n gt from the set up store specified by lt nrf gt where lt nrf gt can be 0 9
32. g can be set independently by internal links as O to 5 Volts the factory default or O to 10 Volts for O to 100 of maximum output The COMmon return signal is referenced to the positive output of the power supply CV and CC can be used independently or together Return slide switches CV and CC to Local when analogue remote control is not in use Do not apply external voltages between the terminals exceeding the maximum for the selected range 5V or 10V 11 Analogue Out Single Programmable models only Connections Vour and lour provide analogue outputs scaled to the set output voltage and set current limit respectively The scaling is fixed at 0 to 5 Volts for 0 to 100 of maximum output Vour and lour are always present on the terminals whether the instrument is under local or remote control The COMMON return signal is referenced to the positive output of the power supply Do not apply external voltages to these terminals Remote On Off Single Programmable models only A switch closure or logic low between connections Rem Off and COM will turn off the output The COM return signal is referenced to the positive output of the power supply Do not apply external voltages to these terminals RS232 PL P models only 9 pin female D connector with pin connections as shown below Can be connected to a standard PC port using a fully wired 1 1 male female cable without any cross over connections Pin Name Description 1 RI Passivel
33. h LOCK still set on the Master both the Voltage and Current controls of the Master stay in LOCK as described previously However the actual set current limit of the Master will still double switching from Tracking to Parallel or halve switching from Parallel to Tracking even though LOCK is set but the current display flashes as a warning that this has happened Retained Slave Settings If V Span is enabled on the Slave output in INDEPENDENT mode it is disabled when TRACKING mode is selected but re enabled when INDEPENDENT mode is re selected If Ratio 96 Tracking is enabled on the Slave output in TRACKING mode it is disabled when INDEPENDENT or PARALLEL are selected but re enabled when TRACKING mode is re selected Simultaneous Output On Off Control The Both On Both Off keys are in addition to the individual OUTPUT switches and permit both outputs to be turned on or off synchronously with a single key press The Both On Both Off keys operate in all four configuration modes 19 Remote Analogue Control Single programmable models only Remote analogue control of output voltage and current is possible using variable external control voltages applied between the rear panel CV and COM or CC and COM inputs respectively The Analogue Out control voltages Vout and lout of one unit acting as a master can be used to control a slave unit via the slave s CV and CC inputs respectively Analogue Voltage Control Re
34. hen immediately set to show new limit status Any bits set in a Limit Event Status Register which correspond to bits set in the accompanying Limit Event Status Enable Register will cause the LIM1 or LIM2 bit to be set in the Status Byte Register Bit 7 Reserved for future use Bit 6 Set when a trip has occurred that can only be reset from the front panel or by removing and reapplying the AC power Bit 5 Reserved for future use Bit 4 Reserved for future use Bit 3 Set when an output over current trip has occurred Bit 2 Set when an output over voltage trip has occurred Bit 1 Set when output enters current limit CC mode Bit 0 Set when output enters voltage limit CV mode Status Byte Register and Service Request Enable Register 30 These two registers are implemented as required by the IEEE Std 488 2 Any bits set in the Status Byte Register which correspond to bits set in the Service Request Enable Register will cause the RQS MSS bit to be set in the Status Byte Register thus generating a Service Request on the bus The Status Byte Register is read either by the STB command which will return MSS in bit 6 or by a Serial Poll which will return RQS in bit 6 The Service Request Enable register is set by the SRE lt nrf gt command and read by the SRE command Bit7 Not used Bit6 RQS MSS This bit as defined by IEEE Std 488 2 contains both the Requesting Service message and the Master Status Summary message RQS
35. hes of slaves to Remote 2 Connect outputs in parallel using equal length wires to the load 3 If remote sensing is required use only remote sense from the master to the load 4 For constant current operation set the required voltage overhead on the master uu m E Remote Local Remote Local in ie H Remote Local Remote Local Tx E E Remote Local Remote Local 4In constant voltage mode the voltage across the load is that set on the master unit by its front panel controls via the digital interface or by the analogue CV remote control input The current limit for the system i e the current in constant current mode is the current limit set on the master x n where n is the total number of units connected in parallel Note Because the analogue remote control inputs are not isolated COM is connected to the positive output terminal it is not possible to use analogue remote control with instruments connected in series Remote Off A switch closure or logic low between the rear panel Rem Off and COM inputs will remotely turn off the output if it was previously on the front panel OUTPUT lamp will also go off Opening the switch between Rem Off and COM will turn the output on again Remote Interface Operation The instrument can be remotely controlled via its RS232 USB LAN or GPIB optional interfaces Analogue remote control is described in the previous section USB remote contro
36. hese signals are referenced to the positive output Voltage 0 3 x10mV Input impedance 100kQ protected to 60V Current 0 5 5mA Input impedance 64kQ protected to 60V Voltage 0 3 x10mV Current 0 5 5mA Output impedance 125Q output short circuit protected Rear panel socket allows a switch closure or logic low to turn output off DIGITAL INTERFACES PL P models only Full digital remote control facilities are available through the RS232 USB LAN and GPIB interfaces Voltage Setting Voltage Readback Current Setting and Current Readback RS232 GPIB optional USB LAN Remote Command Processing Time GENERAL AC Input Power Consumption Operating Range Storage Range Environmental Cooling Safety EMC Size Weight Resolution 1mV Accuracy 0 05 5mV Resolution 1mV Accuracy 0 196 5mV Resolution 0 1mA 0 01mA on 500mA range Accuracy 0 396 3mA to 3A 0 596 3mA to 6A 0 396 0 3mA on 500mA range Standard 9 pin D connector Baud rate 9600 Conforming with IEEE488 1 and IEEE488 2 Standard USB 2 0 hardware connection Operates as a virtual COM port Ethernet 100 10base T hardware connection LXI V1 2 Class C compliant Typically 25ms between receiving the command terminator for a step voltage change at the instrument and the output voltage beginning to change 230V AC or 115V AC x 10 50 60Hz Installation Category II Single 280VA max Dual
37. ich begin with a are implemented as specified by IEEE Std 488 2 as Common commands All will function when used on the other interfaces but some may be of little use Instrument Specific Commands For commands specified as WITH VERIFY the operation is completed when the parameter being adjusted reaches the required value to within 5 or 10 counts whichever is the greater If the value fails to settle within these limits within 5 seconds then the Verify Timeout bit bit 3 is set in the Standard Event Status Register and the operation is completed at the end of the timeout period The Operation Complete bit bit 0 in the Standard Event Status Register is only ever set by the OPC command The OPC or the OPC command can be used for device synchronisation due to the sequential nature of remote operations V n lt nrf gt V n V lt nrf gt OVP lt n gt lt nrf gt l lt n gt lt nrf gt OCP lt n gt lt nrf gt V lt n gt l lt n gt 34 Set output lt n gt to lt nrf gt Volts Set output lt n gt to lt nrf gt Volts with verify Set output lt n gt over voltage protection trip point to lt nrf gt Volts Set output lt n gt current limit to lt nrf gt Amps Set output lt n gt over current protection trip point to lt nrf gt Amps Returns the set voltage of output lt n gt The response is V lt n gt lt nr2 gt lt rmt gt where lt nr2 gt is in Volts Returns the set current limit of output lt n gt The resp
38. ing in the form 90 0 Pcnt and the Slave Voltage controls can be used to set the ratio percentage required The ratio percentage can be set prior to Ratio Tracking being enabled ENABLE lamp off The LOCK and VOLTAGE SPAN functions of the Master operate exactly as described previously However with Ratio Tracking enabled the Slave Voltage controls can still be used to adjust the ratio percentage of the Slave voltage even though the Master voltage is locked The Ratio Tracking mode status at power on is the same as at last power off See also the Retained Slave Settings paragraph Parallel 18 The MODE switch is set to PARALLEL The instrument operates in true parallel mode with all of the power available from the Master output which can then supply up to 6 amps The Slave output is disabled and its displays are turned off In Parallel mode the value of the current limit is doubled for the same setting of the Current limit control including the 500mA range which becomes 1000mA max as a warning when Parallel mode is first selected the current display flashes twice before steadily displaying the new limit Similarly the current display is flashed twice when the mode is changed from Parallel to Tracking as a warning that the Master output current limit has now halved The LOCK and VOLTAGE SPAN functions of the Master operate exactly as described previously It is possible to switch from Parallel mode back to Tracking mode and vice versa wit
39. is returned in response to a Serial Poll and MSS is returned in response to the STB command Bit5 ESB The Event Status Bit This bit is set if any bits set in the Standard Event Status Register correspond to bits set in the Standard Event Status Enable Register Bit4 MAV The Message Available Bit This will be set when the instrument has a response message formatted and ready to send to the controller The bit will be cleared after the Response Message Terminator has been sent Bit3 Not used Bit2 Not used Bit1 LIM2 This will be set if any bits in Limit Event Status Register 2 are set and corresponding bits are set in Limit Event Status Enable Register 2 BitO LIM1 This will be set if any bits in Limit Event Status Register 1 are set and corresponding bits are set in Limit Event Status Enable Register 1 Status Model es sa a eer ee nes rhea ete ne ca sl 3131dWOO NOl1VH3d0 e HOHH3 AH3nD gt Her LNOAWIL A4IH3A 300 gt HOHH3 NOILNOAXSA Ee AE Y04843 aNVAWWNOO ong NO H3MOd SI TE DUAL ONLY RQS 6 MSS 5 boe Pepe Te Lee eo Jone SRQ 31 Power on and Remote Operation Default Settings 32 The following instrument status values are set at power on Status Byte Register 0 Service Request Enable Register T 0 Standard Event Status Register 128 pon bit set Standard Event Status Enable Register T 0 Execution Error Register 0 Query Error Register 0 0 Parallel Po
40. l be sent when approximately 100 free spaces become available in the queue after XOFF was sent This queue contains raw un parsed data which is taken by the parser as required Commands and queries are executed in order and the parser will not start a new command until any previous command or query is complete RS232 responses to commands or queries are sent immediately there is no output queue USB input conforms with USB 2 0 Full Speed Commands must be sent as specified in the commands list and must be terminated with the command terminator code OAH Line Feed LF Commands may be sent in groups with individual commands separated from each other by the code 3BH The group must be terminated with command terminator OAH Line Feed LF Responses from the instrument to the controller are sent as specified in the commands list Each response is terminated by a RESPONSE MESSAGE TERMINATOR which is ODH Carriage Return CR followed by OAH Line Feed LF WHITE SPACE is defined as character codes OOH to 20H inclusive WHITE SPACE is ignored except in command identifiers e g C LS is not equivalent to CLS The high bit of all characters is ignored The commands are case insensitive GPIB Remote Command Formats GPIB input to the instrument is buffered in a 256 byte input queue which is filled under interrupt in a manner transparent to all other instrument operations The queue contains raw un parsed data which is
41. l operates in a similar way to RS232 but via the USB connector Software supplied with the instrument sets up the controlling computer to treat the USB connection as a virtual COM port Application software on the computer can then access the instrument via that COM port The LAN interface is designed to meet LXI Lan eXtensions for Instrumentation version 1 2 the instrument is Class C compliant Remote control using the LAN interface is possible using the TCP IP Sockets protocol The instrument also contains a basic Web server which provides information on the unit and allows it to be configured from a web browser Simple command line control from the browser is also possible The instrument is supplied with RS232 USB and LAN as standard GPIB is an option All interfaces are by default live at all times a LXI requirement but access to individual interfaces may be restricted using the configuration options on the web pages Interface Locking All interfaces are live at all times this removes the need to select the active interface and is also a LXI requirement To reduce the risk of the instrument being inadvertently under the control of two interfaces at once a simple lock and release mechanism is provided in the instruction set The lock is automatically released where it is possible to detect disconnection and when the local button is pressed Access to the interfaces may also be restricted using the web pages Any interface may reques
42. ll Enable Register T T Registers marked thus are specific to the GPIB section of the instrument and are of limited use via other interfaces The instrument will be in local state with the front panel controls active providing rear panel switches CV and CC are set to Local The instrument parameters at power on are the same as at last switch off with the exception of the output status By default this is always off at power on but the user may change this from the front panel to the same at power on as at switch off see Switching On and Power on Conditions paragraph in the Manual Operation section The RST reset interface command resets the instrument to the Remote Operation Default settings Remote Operation Default settings are Vout 0 1V lo47100mA DeltaV 10mV Deltal 1mA Vmin 3V Vmax 5V Tracking Ratio 100 Lock cancelled V Span cancelled 500mA Range cancelled Meter Average cancelled OVP amp OCP at 596 above instrument range maximums Remote interface settings stored set ups Vmin Vmax values and Output state at power on setting are unchanged by RST Mode and Sense settings are as determined by the front panel switches Remote Commands RS232 USB Remote Command Format RS232 input to the instrument is buffered in a 256 byte input queue which is filled under interrupt in a manner transparent to all other instrument operations The instrument will send XOFF when approximately 200 characters are in the queue XON wil
43. ly The GPIB signal grounds are connected to the instrument ground The implemented subsets are SH1 AH1 T6 TEO L4 LEO SR1 RL2 PP1 DC1 DTO CO E2 The GPIB address is set from the front panel 12 Manual Operation In this operating manual front panel keys controls and sockets are shown in capitals e g CURRENT OUTPUT LOCK Messages displayed on the 7 segment LEDs are shown in a different type font e g turn oFF OtP trip The additional features of the Quad mode Dual instrument are described together at the end of this chapter Switching On and Power On Conditions The POWER switch is located at the bottom left of the front panel When the POWER switch is turned on I the right hand meter briefly indicates the firmware revision before the display shows Volts and Amps For programmable PL P models the default display sequence at power on is different the right hand meter briefly indicates the instrument firmware revision followed by the interface firmware revision IF shows in the left hand meter before the display shows Volts and Amps If after a few seconds no physical LAN connection is found the instrument s display will flash alternately between the normal voltage and current values and the message LAn Err forthe next 10 seconds Indication of no LAN connection at power on is an essential LXI compliance requirement but can be disabled by the NOLANOK 1 command over any interface see the LAN Error paragraph in the Remote Interf
44. mmable Models All programmable models have duplicate rear panel Output and Sense terminals appropriate for when the instruments are used in a rack When the rear panel Output terminals are used the use of remote sense is always recommended to ensure that output regulation is maintained within specification connections can be made to either the front or the rear remote sense terminals but never to both pairs of terminals at the same time Connect the Sense terminals to the load following the guidelines above and set the LOCAL REMOTE switch to REMOTE If the rear panel Output terminals are used without remote sense make sure that the front panel switch is set to LOCAL Regulation will be degraded a little when local sense is used because of the additional small voltage drop in the wiring to the rear terminals Series or Parallel Connection with Other Outputs The outputs of the power supply are fully floating and may be used in series with other power supply units to generate high DC voltages up to 300V DC mle A The maximum permissible voltage between any terminal and earth ground is 300VDC WARNING Such voltages are exceedingly hazardous and great care should be taken to shield the output terminals for such use On no account should the output terminals be touched when the unit is switched on under such use All connections to the terminals must be made with the power switched off on all units It should be noted that the unit can only
45. mote analogue voltage control is achieved by setting the rear panel CV switch to Remote and applying a programming voltage between the inputs CV and COM The front panel VOLTAGE controls are disabled when Remote is set on the CV switch Set the switch to Local to return control to the front panel The default input voltage scaling is OV to 5V for O to 100 of the rated output voltage The input voltage scaling can be changed to be OV to 10V by removing an internal shorting link Disconnect the instrument from the AC source and remove the cover as described in the Installation section Referring to the top view of the instrument shown in the drawing remove the tall shorting link in position LK1 Remote CV can be used with either Local or Remote CC Analogue Current Control 20 A II a cm Bon dott oa Remote Local Remote Local YE e Z turi 8888885 peat ene P Tr RS232 USB s J E Ta Ol i B lt ASI O O OOOO E s es Remote analogue constant current control is achieved by setting the rear panel CC switch to Remote and applying a programming voltage between the inputs CC and COM Remote analogue current control can only be used on the high current range not the 500mA range The front panel CURRENT control is disabled when Remote is set on the CC switch Set the switch to Local to return control to the front panel
46. nd pressing it causes the message In trac to be shown momentarily in the Slave display as a reminder It is possible to switch from Tracking mode back to Independent mode with LOCK still set on the Master The Master right hand output settings stay locked but the settings of the left hand output are not locked The Voltage Span keys of the Slave have a different function in Tracking mode see next section Isolated Ratio Tracking Set the MODE switch to ISOLATED TRACKING Ratio Tracking is enabled by pressing the ENABLE key in the Slave VOLTAGE SPAN section ENABLE lamp on The instrument operates as described above for Tracking mode but the Slave voltage can be set to a percentage 0 to 101 of the Master voltage using the Slave Voltage controls The ratio is then maintained as the Master voltage is varied Pressing ENABLE again returns the Slave to standard Tracking mode ENABLE lamp off Ratio Tracking can only be enabled or disabled with the Slave output off If the output is on the display will briefly show the message turn oFF when ENABLE is pressed and the change will not be implemented Whenever Ratio Tracking mode is enabled the Slave display momentarily shows Pent on before reverting to show the actual output voltage now set The percentage value can be shown at any time by pressing either the Vmin or Vmax key of the Slave output With either key held down the Slave display shows the percentage sett
47. nd side V display stops flashing and the right hand side mA display shows Set The setting can be VIEWed at any time by a short press 1 second of the Vmin key The upper voltage limit is set and VIEWed in exactly the same way using the VOLTAGE controls and the Vmax key The limits can be set in any order and to any value within the output range of the instrument but V Span can only be turned on with the ENABLE key if Vmax Vmin 0 1V if this condition is not met the message Set Err is briefly displayed and the V Span function is not implemented When V Span is enabled the range of the MAIN VOLTAGE control is exactly Vmin to Vmax when the FINE control is set at its mid point marked on the panel with a e The FINE control itself can be usefully used to give an additional fine adjustment of 1 of the voltage span The V Span status at power on is the same as at last power off Mode Control of the Quad Mode Dual The four operating modes of the Quad Mode Dual are described below the mode is changed using the MODE rotary switch To prevent unintended voltages being accidentally applied to the circuits connected to the outputs changing modes will always cause both outputs to be switched off However it is not possible to guarantee that there will never be any unwanted transients as the mode is switched and the recommendation is therefore that both outputs should always be switched off before any mode change Independen
48. nnections lt 3m therefore not tested Performance B B e EN61000 4 5 2006 Surge 0 5kV line to line 1kV line to ground Performance A B f EN61000 4 6 2007 Conducted RF 3V 80 AM at 1kHz AC line only DC Output connections 3m therefore not tested Performance A A Tsignal lines were not tested on the basis that typical use will be with connections lt 3m for which there is no test requirement Immunity performance with connections gt 3m is not guaranteed According to EN61326 1 the definitions of performance criteria are Performance criterion A During test normal performance within the specification limits Performance criterion B During test temporary degradation or loss of function or performance which is self recovering Performance criterion C During test temporary degradation or loss of function or performance which requires operator intervention or system reset occurs Where Performance B is stated it is because DC Output regulation or V amp measurement accuracy may deviate beyond Specification limits under the test conditions However the possible deviations are still small and unlikely to be a problem in practice Note that if operation in a high RF field is unavoidable it is good practice to connect the PSU to the target system using screened leads which have been passed together through an absorbing ferrite sleeve fitted close to the PSU terminals Cautions To ens
49. onse is lt n gt lt nr2 gt lt rmt gt where lt nr2 gt is in Amps OVP lt n gt OCP lt n gt V lt n gt 0 l lt n gt O IRANGE lt n gt lt nrf gt IRANGE lt n gt DELTAV lt n gt lt nrf gt DELTAI lt n gt lt nrf gt DELTAV lt n gt DELTAI lt n gt INCV lt n gt INCV lt n gt V DECV lt n gt DECV lt n gt V INCI n DECI n OP lt n gt lt nrf gt OPALL lt nrf gt OP lt n gt TRIPRST LOCAL IFLOCK IFLOCK Returns the voltage trip setting for output lt n gt The response is VP lt n gt lt nr2 gt lt rmt gt where lt nr2 gt is in Volts Returns the current trip setting for output lt n gt The response is CP lt n gt lt nr2 gt lt rmt gt where lt nr2 gt is in Amps Returns the output readback voltage for output lt n gt The response is lt nr2 gt V lt rmt gt where lt nr2 gt is in Volts Returns the output readback current for output lt n gt The response is lt nr2 gt A lt rmt gt where lt nr2 gt is in Amps Sets the current range of output lt n gt to lt nrf gt where lt nrf gt is 1 for Low 500mA range 2 for High range Output must be switched off before changing range Report the current range for output lt n gt The response is lt nr1 gt lt rmt gt where lt nr1 gt is 1 for Low 500mA range 2 for High range Set the output lt n gt voltage step size to lt nrf gt Volts Set the output lt n gt current step size to lt nrf gt Amps Returns the output l
50. owever the effect of this action will only remain until the instrument is addressed again or receives another character from the interface when the remote state will once again be entered Returning to Local by this action or by the use of the LOCAL command will keep the V I settings at their last remotely set values with Lock Settings on and will leave the output s in their present state RS232 Interface RS232 Interface Connector The 9 way D type serial interface connector is located on the instrument rear panel The pin connections are as shown below Pin Name Description 1 RI Passively asserted V through 10kQ 2 TXD Transmitted data from instrument 3 RXD Received data to instrument 4 CTS 5 GND Signal ground 6 RTS Passively asserted V through 10kQ 7 DSR No internal connection 8 DTR 9 CD No internal connection RS232 Connections The RS232 interface should be connected to a standard PC port using a fully wired 1 1 male female cable without any cross over connections Alternatively only pins 2 3 and 5 need be connected to the PC but with links made in the connector at the PC end between pins 1 4 and 6 and between pins 7 and 8 see diagram PC i i INSTRUMENT pre gt DCD lt 1 0 34 Q 1 RX 20 O2 TX eg OO DTR 9 40 O4 GND s50 Os DSR 6 O O6 RTS 9 7 O O7 VA ac LINKS TO O8 RI 90 NULL OUT PC O9 24 Baud Rate for this instrument is fixed at
51. pply voltages or environmental range WARNING THIS INSTRUMENT MUST BE EARTHED Any interruption of the mains earth conductor inside or outside the instrument will make the instrument dangerous Intentional interruption is prohibited The protective action must not be negated by the use of an extension cord without a protective conductor When the instrument is connected to its supply terminals may be live and opening the covers or removal of parts except those to which access can be gained by hand is likely to expose live parts The apparatus shall be disconnected from all voltage sources before it is opened for any adjustment replacement maintenance or repair Capacitors inside the power supply may still be charged even if the power supply has been disconnected from all voltage sources but will be safely discharged about 10 minutes after switching off power Any adjustment maintenance and repair of the opened instrument under voltage shall be avoided as far as possible and if inevitable shall be carried out only by a skilled person who is aware of the hazard involved If the instrument is clearly defective has been subject to mechanical damage excessive moisture or chemical corrosion the safety protection may be impaired and the apparatus should be withdrawn from use and returned for checking and repair Make sure that only fuses with the required rated current and of the specified type are used for replacement The use of makeshif
52. preset using the VOLTAGE and CURRENT controls the left hand meter shows the set voltage the right hand meter shows the set maximum current and the SETTINGS indicator is lit When the output switch is switched on the OUTPUT indicator lights the left hand meter now shows the actual voltage and the right hand meter the actual load current The upper limit of the CURRENT control can be switched between the maximum for this model and 500mA with alternate presses of the 500mA RANGE key to give finer current limit setting and measurement resolution 0 1m4A up to 500mA the indicator beside the key is lit when the 500mA range is selected 13 To change the current limit range the output must be switched off if the output is on the warning message turn oFF is shown briefly in the display the OUTPUT indicator flashes and the range remains unchanged Constant Voltage The output voltage is adjusted using the main and fine VOLTAGE controls the CURRENT control sets the maximum current that can be supplied Constant Current If the load resistance is low enough such that at the output voltage set a current greater than the current limit setting would flow the power supply will automatically move into constant current operation The current output is adjusted by the CURRENT control and the VOLTAGE controls set the maximum voltage that can be generated The CC indicator lights to show constant current mode Instantaneous Current Output
53. rmance levels achieved are detailed in the user manual Safety EN61010 1 Installation Category II Pollution Degree 2 i f f CHRIS WILDING TECHNICAL DIRECTOR 2 May 2009 EMC This instrument has been designed to meet the requirements of the EMC Directive 2004 108 EC Compliance was demonstrated by meeting the test limits of the following standards Emissions EN61326 1 2006 EMC product standard for Electrical Equipment for Measurement Control and Laboratory Use Test limits used were a Radiated Class B b Conducted Class B c Harmonics EN61000 3 2 2006 Class A the instrument is Class A by product category Immunity EN61326 1 2006 EMC product standard for Electrical Equipment for Measurement Control and Laboratory Use Test methods limits and performance achieved are shown below requirement shown in brackets a EN61000 4 2 1995 Electrostatic Discharge 4kV air 4kV contact Performance A B b EN61000 4 3 2006 Electromagnetic Field 3V m 80 AM at 1kHz 80MHz 1GHz Performance A A and 1 4GHz to 2GHz Performance A A 1V m 2 0GHz to 2 7GHz Performance A A c EN61000 4 11 2004 Voltage Interrupt 72 cycle 0 Performance A B 1 cycle 0 Performance B B 25 cycles 70 and 250 cycles 0 Performance B C Output status at power up must be set to be same as at last power down otherwise Performance C d EN61000 4 4 2004 Fast Transient 1kV peak AC line only DC Output co
54. rt with the instrument off and with the Lock Meter Average and Current Range keys all held down SLAVE output only on dual switch the instrument on The display will show Addr in the Volts display and nn in the mA display where nn is the present setting default Addr 11 The address can be decremented and incremented by the Meter Average and Current Range keys respectively in the range 1 to 31 inclusive not 0 with wrap round The address is confirmed and the process exited by holding down the Lock key the display will show SEt and the new address for approximately 2 seconds returning to the normal Volts and mA display when the new address has been accepted The address can also be set from the instrument s web pages 23 Remote Local Operation At power on the instrument will be in the local state with the REMOTE indicator off In this state all front panel operations are possible When the instrument is addressed to listen and a command is received the remote state will be entered and REMOTE will be turned on In this state the front panel is locked out and remote commands only will be processed The V I settings Meter Average setting Current Range and output state s are unchanged but LOCK and V Span are cancelled if they were on The Vmin and Vmax values are retained The MODE QMD P models only and Sense settings remain as set by the front panel switches The instrument may be returned to the local state by pressing the LOCAL key h
55. s read and cleared by the ESR command The Standard Event Status Enable register is set by the ESE lt nrf gt command and read by the ESE command It is a bit field where each bit has the following significance Bit 7 Power On Set when power is first applied to the instrument Bit 6 User Request Not used Bit 5 Command Error Set when a syntax type error is detected in a command from the bus The parser is reset and parsing continues at the next byte in the input stream Bit 4 Execution Error Set when an error is encountered while attempting to execute a completely parsed command The appropriate error number will be reported in the Execution Error Register see Error Messages section Bit 3 Verify Timeout Error Set when a parameter is set with verify specified and the value is not reached within 5 seconds e g output voltage is slowed by a large capacitor on the output Bit 2 Query Error Set when a query occurs The appropriate error number will be reported in the Query Error Register see Query Error Register section Bit 1 Not used Bit 0 Operation Complete Set in response to the OPC command Execution Error Register This register contains a number representing the last error encountered over the current interface The Execution Error Register is read and cleared using the EER command On power up this register is set to O for all interface instances Error messages have the following meaning 0 No
56. server allowing the instrument to be pinged via either its host name or IP address VXI 11 Discovery Protocol 26 The instrument has very limited support of VXI 11 which is sufficient for the discovery protocol and no more The instrument implements a Sun RPC Port mapper on TCP port 111 and UDP port 111 as defined in RPC1183 The calls supported are NULL GET PORT and DUMP On TCP port 1024 a very simple VXI 11 protocol is implemented sufficient only for instrument discovery This implements the following calls CREATE LINK DEVICE_WRITE DEVICE_READ and DESTROY_LINK Once a link has been created anything written to the device is ignored and any read from the device returns the identification string as would be expected from a IDN of the form Manufacturer Model Serial No X xx Y yy for example THURLBY THANDAR PL601 P 279730 1 00 1 00 where X xx is the revision of the main firmware and Y yy is the revision of the interface firmware Interface firmware is user field updateable via the USB port VISA Resource Name Because of the limited support for VXI 11 Discovery Protocol only the instrument must be referred to by its raw socket information when used in software packages which communicate via a VISA resource name For example an instrument at IP address 192 168 1 100 would normally have a VISA resource name of TCPIP0 192 168 1 100 inst0 INSTR but for this instrument the name must be modified
57. splayed but are placed in the Execution Error Register where they can be read via the remote interfaces see Status Reporting section 37 Maintenance The Manufacturers or their agents overseas will provide a repair service for any unit developing a fault Where owners wish to undertake their own maintenance work this should only be done by skilled personnel in conjunction with the service manual which may be purchased directly from the Manufacturers or their agents overseas Cleaning If the instrument requires cleaning use a cloth that is only lightly dampened with water or a mild detergent WARNING TO AVOID ELECTRIC SHOCK OR DAMAGE TO THE INSTRUMENT NEVER ALLOW WATER TO GET INSIDE THE CASE TO AVOID DAMAGE TO THE CASE NEVER CLEAN WITH SOLVENTS Web link For the latest version of this instruction manual IVI driver and any applicable firmware updates go to http www tti test com qo psx 38 Thurlby Thandar Instruments Ltd Glebe Road Huntingdon Cambridgeshire e PE29 7DR England United Kingdom Telephone 44 0 1480 412451 Fax 44 0 1480 450409 International web site www tti test com UK web site www tti co uk Email info tti test com Aim Instruments and Thurlby Thandar Instruments Book Part No 48511 1140 Issue 10
58. standard version 1 2 and contains the interfaces and protocols described below Since it is possible to misconfigure the LAN interface making it impossible to communicate with the instrument over LAN a LAN Configuration Initialise LCI mechanism is provided via a recessed switch on the rear panel to reset the unit to the factory default The default setting is for the instrument to attempt to obtain settings via DHCP if available or if DHCP times out 30 seconds via Auto IP In the very unlikely event that an Auto IP address cannot be found a static IP address of 192 168 0 100 is assigned Resetting the LAN removes any password protection For more information on LXI standards refer to www Ixistandard org home 25 LAN Connection To use the LAN interface the IP address of the unit must be known There is a LXI Discovery Tool on the supplied CD ROM which can be used to display the IP addresses and other associated information of all connected devices that comply with the VXI 11 discovery protocol This tool is a Windows PC application that should be installed and run on the controlling PC with the unit either connected directly to the PC network connector or via a router Connecting via a router is recommended as this is significantly quicker to assign an IP address connecting directly to the PC will begin to assign an IP address only after a 30 second DHCP timeout Double clicking on any entry in the list of devices discovered will open the
59. ster slave configurations trademarks of National Instruments Corp trademark of Agilent Technologies inc Specification General specifications apply for the temperature range 5 C to 40 C Accuracy specifications apply for the temperature range 18 C to 28 C after 1 hour warm up with no load and calibration at 23 C Typical specifications are determined by design and are not guaranteed OUTPUTS Voltage Current Ranges PL 155 PL 303 PL 601 PL303QMD Note In manual operation figures given above Voltage Setting Current Setting Configuration Selection PL303QMD only Voltage Span Control V Span Settings Lock S Lock Output Mode Output Switch Output Terminals Transient Response Voltage Programming Speed PL P models 15V 5A 15V 500mA 30V 3A 30V 500mA 60V 1 5A 60V 500mA Ripple and Noise 20MHz bandwidth OV to 15V 1mA to 5000mA OV to 15V 0 1mA to 500mA OV to 30V 1mA to 3000mA OV to 30V 0 1mA to 500mA OV to 60V 1mA to 1500mA OV to 60V 0 1mA to 500mA OV to 30V 1mA to 3000mA OV to 30V 0 1mA to 500mA each output OV to 30V 2mA to 6000mA OV to 30V 0 2mA to 1000mA parallel mode actual maxima for voltage and current are typically 196 greater than the By coarse and fine controls By single logarithmic control Independent True parallel Isolated Tracking amp Isolated Ratio Tracking modes via front panel rotary switch The voltage adjustment range can be controlle
60. t lt version gt lt rmt gt where NAME is the manufacturer s name model defines the type of instrument Serial No is the unique serial number and version is the revision level of the software installed The format of version is X xx Y yy where X xx is the revision of the main instrument firmware and Y yy is the revision of the Interface board firmware The Interface firmware is field updateable by the user via the USB port Returns the bus address of the instrument This is the address used by GPIB if fitted or may be used as a general identifier over the other interfaces Reports the operating mode set by the front panel MODE switch The syntax of the response is lt nr1 gt lt rmt gt where lt nr1 gt is 1 for single channel units and dual units operating in parallel mode 2 for dual units with both channels operating independently and 0 for dual units in tracking mode Set the current meter measurement averaging layc of output n where lt nrf gt has the following meaning 0 OFF 1 ON Disables the LAn Err message for no LAN connection found at power on if lt nrf gt is 1 and enables the message if lt nrf gt is O The PSU has no self test capability and the response is always 0 rmt The PSU has no trigger capability The command is accepted but performs no action Each error message has a number only this number is reported via the remote control interfaces Error message numbers are not di
61. t Set the MODE switch to INDEPENDENT The two outputs are completely independent and electrically isolated each can be set as described in the preceding Output Control section It is not possible to switch from Independent mode to Tracking with LOCK set on the Slave output The message Un loc is shown in the Slave display and LOCK must first be switched off in Independent mode before the Tracking modes can be used See also the Retained Slave Settings paragraph Isolated Tracking Set the MODE switch to ISOLATED TRACKING The two outputs remain electrically isolated but the Voltage controls of the Master output set an identical voltage on the Slave output The Current controls of the Slave remain independent including the 500mA Range and Meter Average functions 17 The electrical isolation permits the two outputs to be connected to provide for example tracking voltages of opposite polarity or identical voltages connected to different system references e g digital ground and analogue ground The LOCK and VOLTAGE SPAN functions of the Master operate exactly as described previously and because the output voltage of the Slave tracks the Master they control the Slave output voltage as well Note that only the output voltage of the Slave is locked when the Master LOCK is used the current controls of the Slave including the 500mA Range and Meter Average functions remain independent The LOCK key on the Slave output is ignored a
62. t fuses and the short circuiting of fuse holders is prohibited Do not wet the instrument when cleaning it The following symbols are used on the instrument and in this manual Caution refer to the accompanying documentation incorrect operation may damage the instrument Earth ground terminal mains supply OFF mains supply ON alternating current ac oH direct current dc Installation Mains Operating Voltage Fuse Check that the instrument operating voltage marked on the rear panel is suitable for the local supply Should it be necessary to change the operating voltage proceed as follows 1 Ensure that the instrument is disconnected from the AC supply 2 Remove the plastic push rivets at each side edge of the top cover Use the blade of a small screwdriver to first ease out the rivet head and then fully remove the rivet body Remove the two rear panel screws securing the top cover slide the cover back and lift off 3 Change the transformer connections two transformers on the dual following the diagrams 230V Operation 115V Operation BLUE BROWN BLUE BROWN 4 Re assemble in the reverse order To comply with safety standard requirements the operating voltage marked on the rear panel must be changed to clearly show the new voltage setting The AC fuse is located in the fuse drawer in the lower part of the IEC inlet connector single units or in separate fuse holders for each channel dual units
63. t n gt voltage step size The response is DELTAV lt n gt lt nr2 gt lt rmt gt where lt nr2 gt is in Volts Returns the output lt n gt current step size The response is DELTAI lt n gt lt nr2 gt lt rmt gt where lt nr2 gt is in Amps Increment the output n voltage by the step size set for output n Increment the output n voltage by the step size set for output n and verify Decrement the output n voltage by the step size set for output n Decrement the output n voltage by the step size set for output n and verify Increment the output n current limit by the step size set for output n decrement the output n current limit by the step size set for output n set output n on off where lt nrf gt has the following meaning O OFF 1 ON Simultaneously sets all outputs on off where lt nrf gt has the following meaning O ALL OFF 1 ALL ON If OPALL sets all outputs ON then any that were already on will remain ON If OPALL sets all outputs OFF then any that were already off will remain OFF Returns output n on off status The response is lt nr1 gt lt rmt gt where 1 ON 0 OFF Attempt to clear all trip conditions Go to local This does not release any active interface lock so that the lock remains with the selected interface when the next remote command is received Request interface lock This command requests exclusive access control of the instrument The response is 1 if succ
64. t the configuration of the instrument a LAN Configuration Initialise LCI mechanism is provided via a recessed switch on the rear panel marked LAN RESET to reset the unit to the factory default The default setting is for the instrument to attempt to obtain settings via DHCP if available or if DHCP times out 30 seconds via Auto IP In the very unlikely event that an Auto IP address cannot be found a static IP address of 192 168 0 100 is assigned The display will also flash alternately between the normal values and LAn Err if no physical LAN connection is found at power on but will stop flashing after 10 seconds To disable this message at every power on send the command NOLANOK 1 over any interface To re enable the message at power on send the command NOLANOK 0 or use the recessed rear panel LAN RESET switch to reset all LAN parameters to their factory default settings see the introduction to the LAN section GPIB Interface The GPIB interface 24 way connector is located on the instrument rear panel The pin connections are as specified in IEEE Std 488 1 1987 and the instrument complies with IEEE Std 488 1 1987 and IEEE Std 488 2 1987 GPIB Subsets This instrument contains the following IEEE 488 1 subsets Source Handshake SH1 Acceptor Handshake AH1 Talker T6 Listener L4 Service Request SR1 Remote Local RL2 Parallel Poll PP1 Device Clear DC1 Device Trigger DTO Controller CO Electrical Interface E2 27 GPIB IEEE Std 4
65. t to have exclusive control of the instrument by sending an IFLOCK command The lock may only be released by sending an IFUNLOCK command from the interface instance that currently has the lock and may be queried from any interface by sending an IFLOCK command The reply to any of these commands will be 1 if the lock is owned by another interface instance 0 if the interface is free and 1 if the lock is owned by the requesting interface instance Sending any command from an interface without control privileges that attempts to change the instrument status will set bit 4 of the Standard Event Status Register and put 200 into the Execution Error Register to indicate that there are not sufficient privileges for the required action Note it is also possible to configure the privileges for a particular interface to either read only or no access from the Web page interface Address Selection The instrument address capability is strictly required only by the GPIB interface However use can be made of the ADDRESS command over any of the interfaces to easily identify which instrument is being controlled by a particular COM port for RS232 or USB or TCP socket for LAN Note that the LAN interface also has a separate Identify function accessible from the instrument s web pages that flashes the instrument s display until the function is cancelled The address is set from the instrument s front panel as follows Sta
66. taken by the parser as required Commands and queries are executed in order and the parser will not start a new command until any previous command or query is complete There is no output queue which means that the response formatter will wait indefinitely if necessary until the instrument is addressed to talk and the complete response message has been sent before the parser is allowed to start the next command in the input queue Commands are sent as PROGRAM MESSAGES by the controller each message consisting of zero or more PROGRAM MESSAGE UNIT elements separated by PROGRAM MESSAGE UNIT SEPARATOR elements A PROGRAM MESSAGE UNIT is any of the commands in the remote commands list A PROGRAM MESSAGE UNIT SEPARATOR is the semi colon character 3BH PROGRAM MESSAGES are separated by PROGRAM MESSAGE TERMINATOR elements which may be any of the following NL The new line character OAH NL END The new line character with the END message END The END message with the last character of the message Responses from the instrument to the controller are sent as RESPONSE MESSAGES A RESPONSE MESSAGE consists of one RESPONSE MESSAGE UNIT followed by a RESPONSE MESSAGE TERMINATOR A RESPONSE MESSAGE TERMINATOR is the new line character with the END message NL END 33 Each query produces a specific lt RESPONSE MESSAGE gt which is listed along with the command in the remote commands list W
67. tray for forced cooling Connections Front Panel Connections The load should be connected to the positive red and negative black terminals marked OUTPUT Both are fully floating and either can be connected to ground Remote sense connections to the load if required are made from the positive and negative SENSE terminals Switch the LOCAL REMOTE switch to REMOTE when remote sensing is required Switch back to LOCAL when remote sensing is not in use The terminal marked i is connected to the chassis and safety earth ground afi iain E is D ae z IIZB 7 nnH PL303 POWER SUPPLY 30V3A ii lg Il 1 Il I i VIISETTINGS METER 500mA VIEW LOCK AVERAGE RANGE i C oO C Jo O l i LOCAL HOL
68. ure continued compliance with the EMC directive observe the following precautions a after opening the case for any reason ensure that all signal and ground connections are remade correctly and that case screws are correctly refitted and tightened b In the event of part replacement becoming necessary only use components of an identical type see the Service Manual Safety This instrument is a Safety Class instrument according to IEC classification and has been designed to meet the requirements of EN61010 1 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use It is an Installation Category II instrument intended for operation from a normal single phase supply This instrument has been tested in accordance with EN61010 1 and has been supplied in a safe condition This instruction manual contains some information and warnings which have to be followed by the user to ensure safe operation and to retain the instrument in a safe condition This instrument has been designed for indoor use in a Pollution Degree 2 environment in the temperature range 5 C to 40 C 20 80 RH non condensing It may occasionally be subjected to temperatures between 5 C and 10 C without degradation of its safety Do not operate while condensation is present Use of this instrument in a manner not specified by these instructions may impair the safety protection provided Do not operate the instrument outside its rated su
69. y asserted V through 10k 2 TXD Transmitted data from instrument 3 RXD Received data to instrument 4 CTS 5 GND Signal ground 6 RTS Passively asserted V through 10kQ 7 DSR No internal connection 8 DTR 9 CD No internal connection Signal ground is connected to instrument ground USB PL P models only The USB port is connected to instrument ground It conforms with USB 2 0 Full Speed and accepts a standard USB cable The Windows plug and play functions should automatically recognise that the instrument has been connected If the correct driver is not found follow the Windows on screen prompts and install the required files from the CD supplied LAN PL P models only The LAN interface is designed to meet LXI Lan eXtensions for Instrumentation version 1 2 the instrument is Class C compliant Remote control using the LAN interface is possible using a TCP IP Socket protocol The instrument also contains a basic Web server which provides information on the unit and allows it to be configured Since it is possible to misconfigure the LAN interface making it impossible to communicate with the instrument over LAN a LAN Configuration Initialise LCI mechanism is provided via a recessed switch on the rear panel marked LAN RESET to reset the unit to the factory default Further details are given in the Remote Operation chapter For more information on LXI standards refer to www lxistandard org home GPIB factory option on PL P models on

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