CPX400D & DP Instruction Manual - English
Contents
1. THURLBY THANDAR INSTRUMENTS CPX400D amp DP OOOO O PowerFlex Dual DC Power Supply INSTRUCTION MANUAL Table of Contents Specification 2 Safety 5 EMC 7 Installation 8 Connections 9 Manual Operation 11 Remote Interface Operation CPX400DP only 17 Remote Commands CPX400DP only 27 Maintenance 32 Note The latest revisions of this manual device drivers and software tools can be downloaded from http www tti test com go csx This manual is 48511 1480 Issue 2 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 Voltage Range Current Range Power Range Output Voltage Setting Output Current Setting Operating Mode Operating Ranges Settings Lock S Lock Output Switch Output Terminals Output Sensing Output Protection OVP Range OCP Range Over temperature Protection OUTPUT SPECIFICATIONS OV to 60V OA to 20A Up to 420W By coarse and fine controls 60V CPX400D amp DP Power Envelope Volts per channel By single logarithmic control Constant voltage CV or constant current CC with automatic cross over provided that the power demanded stays within the power envelope see graph Outside of this envelope the output becomes unre2. In rack mounted situations allow adequate space around the instrument and or use a fan tray for forced cooling Mounting This instrument is suitable both for bench use and rack mounting It is delivered with feet for bench mounting The front feet include a tilt mechanism for optimal panel angle A rack kit for mounting one or two of these Half width 3U high units in a 19 rack is available from the Manufacturers or their overseas agents Connections Front Panel Connections 60V max 20A max T T P CPX400DP DUAL 60V 20A PSU PowerFlex REM UNREG CC CV LAN UNREG CC CV PD rT VIEW Ci Litt Li v me OUTPUT 1 A ririri ag LIL CUSTOMLIMITS Hold iM 60V 20A Mm 607A 20 208 mm A E Ka EAN V I SETTINGS VIEW LOCK Ec o LOCAL Hold to Cancel rey ri rt O L e e OVP OVP 20V 20A mmm es CURRENT SNCT VOLTAGE MAIN FINE MAIN FINE POWER N OUTPUT 1 OUTPUT 2 UF 00000 LJ mm LOCAL REMOTE 300V pk max to 300V pk max to SENSE V I SETTINGS LOCK Me Hold to Cancel OUTPUT 2 o A om ES e tose CURRENT O O20 Q O SENSE ali co LOCAL REMOTE CUSTOM LIMITS Hold The load should be connected to the positive red and negative black terminals marked OUTPUT The OUTPUT terminals are rated at 30A Remote sense connections to the load if required are made from the positive and negative SENSE terminals Switch the LOCAL RE
3. 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 lt nr1 gt lt rmt gt See Status Reporting section for details Returns ist local message as defined by IEEE Std 488 2 The syntax of the response is O lt rmt gt 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 lt rmt gt and 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 RST SRE lt nrf gt SRE STB WAI 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 Operatio
4. Switch back to LOCAL when remote sensing is not in use RS232 CPX400DP 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 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 Signal ground is connected to instrument ground USB CPX400DP 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 CPX400DP 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
5. 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 successful 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 O 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 Release the lock if possible This command returns the value O 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 29 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 CONFIG lt nrf gt CONFIG RATIO lt nrf gt RATIO Query and clear Limit Event Status Register lt n gt 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 lt n gt to lt
6. 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 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 conne
7. from Vrrack back to Independent with LOCK still set on the Master The Master settings stay locked but the settings of the Slave are not locked The Vrrack Status at power on is the same as at last power off 15 Synchronous Output On Off Control 16 Vie SYNCHRONOUSONIOEE 50 The SYNCHRONOUS ON OFF key is in addition to the individual OUTPUT switches and permit both outputs to be turned on or off synchronously with a single key press Since this key turns both outputs on or off with alternate presses it is necessary for both outputs to be in the same state i e both on or both off before the key is used Pressing the key with one output on and one output off will have no effect Remote Interface Operation CPX400DP only The instrument can be remotely controlled via its RS232 USB LAN or GPIB interfaces USB remote control 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 configu
8. give 60V 7A 42V 10A and 20V 20A under all supply conditions both outputs loaded at lower output voltages the output power is restricted by the 20A current maximum When the power limit is exceeded the status indication will change from CV or CC to UNREG For example if the supply is set to 20V with the current limit at maximum and is connected to a 20 load 10 Amps will flow and the supply will be in CV mode As the voltage across the load is increased the power into the load increases until at about 29V the power limit is exceeded and the supply changes from CV to UNREG Connection to the Load The load should be connected to the positive red and negative black front panel OUTPUT terminals Both are fully floating and either can be connected to ground Alternatively on the CPX400DP connection can be made to the duplicate rear panel Output terminals appropriate for when the instrument is 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 see Remote Sensing section below 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 internal wiring to the rear terminals Remote Sensing The instrument has a very low output impedance
9. 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 En vil SETTINGS If the output is still on OP on output on will flash twice in the g display followed by flashing of the new unlocked settings for 2 3 vo ee O E O seconds slowly at first then faster before the change is finally Cc io LOCAL Hold to Cancel 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 select a different range with LOCK enabled is not allowed if attempted the message Unloc is shown briefly in the display and the LOCK lamp 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 lamp flashing followed by the message Unloc with the LOCK lamp flashing The LOCK status at power on is the same as at last power off
10. 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 CPX400DP only 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 10 Manual Operation The operation of both outputs is identical the following description applies to both Switching On The power switch located at the bottom left of the front panel switches between standby d and on 1 In standby the auxiliary power circuit remains connected and consumes 6 Watts To fully disconnect from the AC supply unplug the mains cord from the back of the instrument or switch off at the AC supply outlet make sure that the means of disconnection is readily accessible Disconnect from the AC supply when not in use The lower meter of Output 1 briefly indicates the instrument firmware revision on the CPX400DP this is followed by the interface firmware revision IF shows in the upper meter before the display shows Volts and Amps the LAN lamp above the right hand output meters will also light but will go off after 30s if an operational LAN connection is not found see LAN Error paragraph in LAN Interface section At power on the factory default setti
11. nrf gt Return the value of LSE lt n gt Limit Event Status Enable Register lt n gt response is lt nr1 gt lt rmt gt Save the current set up of output lt n gt 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 Sets operating mode where lt nrf gt is 2 is for outputs operating independently and 0 for voltage tracking mode Reports the operating mode The response is lt nr1 gt lt rmt gt where lt nr1 gt is 2 for outputs operating independently and O for voltage tracking mode 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 Ratio can set at any time but will not have any effect until voltage tracking mode is set by using CONFIG lt 0 gt Query the ratio of output 2 slave to output 1 master in tracking mode The response is lt nrf gt lt rmt 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 30 Clear Status Clears the Status structure This indirectly clears the Status Byte Register Query and clear Execution Error Register The response format is nr1 lt rmt gt Set the Standard Event Status Enable Register to the value of lt nrf gt
12. over current protection is implemented in firmware and can only be set via the remote interfaces Setting resolution 10mA Response time typically 500ms For manual operation Local mode amp CPX400D OCP is fixed at 22A The output will be tripped off if a fault causes the internal temperature to rise excessively Line Regulation Load Regulation Ripple amp Noise 20MHz bandwidth Transient Load Response Voltage Programming Speed CPX400DP only Range and Setting 60V 7A 20V 20A Temperature Coefficient Status Indication Change in output for a 10 line change Constant voltage lt 0 01 of maximum output Constant current lt 0 01 of maximum output Change in output for any load change within PowerFlex envelope remote sense connected Constant voltage lt 0 01 of maximum output Constant current lt 0 05 of maximum output 5mVrms max typically lt 3mVrms lt 15mV pk pk at maximum load CV mode lt 250us to within 50mV of set level for a 5 to 95 load change Maximum time required for output to settle within 1 of its total excursion for resistive load Excludes command processing time 90 Load No Load 90 Load No Load Up 8ms 8ms Down 80ms 1 5s Up 8ms 8ms Down 10ms 1 2s Typically lt 100ppm C Output ON lamp Constant voltage mode lamp Constant current mode lamp Unregulated power limit lamp Remote lamp CPX400DP only LAN lamp Trip message on display METER SPECIFICA
13. 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 o sense of the response bit O low 1 high bit position of the response Example To return the RQS bit bit 6 of the Status Byte Register as a 1 when true and a O 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 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 22 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 p
14. vValtags Tracking Mode Pressing Vrrack selects voltage tracking mode The two outputs remain electrically isolated but the Voltage controls of Output 1 the Master set an identical voltage on Output 2 the Slave The Current controls of Master and Slave remain independent 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 Tracking is also useful when the outputs are connected in parallel Vrrack Can only be enabled or disabled with Output 2 the Slave off If an attempt is made to set V rack With the Slave output on then the message turn oFF is shown in the display accompanied by the output lamp flashing Selecting Vtrack automatically sets the range of Output 2 to 60V 20A when Vrrack is cancelled the Output 2 range reverts to that set before Vrrack was selected The LOCK function of the Master operates exactly as described previously and because the output voltage of the Slave tracks the Master it controls 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 remain independent The LOCK key on the Slave output is ignored and pressing it causes the message In trac to be shown momentarily in the Slave display as a reminder It is possible to switch
15. 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 lt 25ms between receiving the command terminator for a step voltage change at the instrument and the output voltage beginning to change 110V 240V AC 10 50 60Hz Installation Category II 1250VA 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 Complies with EN61010 1 Complies with EN61326 210 x 130 x 375mm WxHxD half rack width x 3U height optional rack mounting kit available 7 4kg Safety This power supply 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
16. 68 0 100 is assigned If no physical LAN connection is found at any time the LAN lamp will be off 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 21 GPIB IEEE Std 488 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 lt PROGRAM MESSAGE TERMINATOR gt 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 wil
17. 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 go csx 32 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 1480 Issue 2
18. M MESSAGE TERMINATOR gt elements which may be any of the following NL The new line character OAH NL END The new line character with the END message SEND The END message with the last character of the message Responses from the instrument to the controller are sent as lt RESPONSE MESSAGES gt A lt RESPONSE MESSAGE gt consists of one lt RESPONSE MESSAGE UNIT gt followed by a lt RESPONSE MESSAGE TERMINATOR gt A lt RESPONSE MESSAGE TERMINATOR is the new line character with the END message NL END 27 Each query produces a specific lt RESPONSE MESSAGE gt which is listed along with the command in the remote commands list lt WHITE 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
19. MOTE switch to REMOTE when remote sensing is required Switch back to LOCAL when remote sensing is not in use The terminal marked is connected to the chassis and safety earth ground Rear Panel Connections CPX400DP only RESET O OUTPUT2 OUTPUT 1 USB O O LAN RS232 O E FOF O HOHO GPIB O HO RATED VOLTAGE 110V 240VAC 50 60Hz S O S O POWER 1250VAMAX THIS INSTRUMENT HAS A UNIVERSAL OPERATING RANGE O REFER TO MANUAL FUSE 15A T 250V HBC 114 x 14 REMOVE TOP COVER TO WARNING DO NOT TAMPER EARTHBONDPOINT WARNING THIS APPARATUS MUST BE EARTHED ACCESS FUSE REPLACE ONLY WITH FUSE OF CORRECT TYPE AND RATING REFER TO MANUAL CAUTION DISCONNECT FROM THE AC SUPPLY LINE WHEN NOT IN USE AND BEFORE REMOVING COVERS REFER TO MANUAL The output and sense terminals for OUTPUT1 and OUTPUT2 are duplicated on the rear panel terminal blocks and are marked O P O P S and S 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
20. Request Enable Register 24 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 Notused 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 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 Eve
21. TIONS Meter Types Meter Resolutions Meter Accuracies Dual 4 digit meters with 10mm 0 39 LEDs Reading rate 4 Hz 10mV 10mA Voltage 0 1 of reading 2 digits Current 0 3 of reading 2 digits ADDITIONAL SPECIFICATIONS Independent Mode VoltageTracking Mode Vtrack Tracking Accuracy Synchronous On Off Each output is fully independent and isolated Operation is equivalent to two single power supplies With Vrrack selected the voltage controls of Output 1 the Master set an identical voltage on Output 2 The outputs remain isolated and the current controls remain independent Locking the Master S Lock also locks the voltage of Output 2 Slave voltage Master voltage 0 1 of Master voltage 20mV In addition to the independent DC On Off controls for each output the outputs can be turned on or off simultaneously using the Synchronous On Off key This key operates in all modes DIGITAL INTERFACES CPX400DP only Full digital remote control facilities are available through the RS232 USB LAN and GPIB interfaces Voltage Setting Current Setting RS232 GPIB USB LAN Remote Command Processing Time GENERAL AC Input Power Consumption Operating Range Storage Range Environmental Safety EMC Size Weight 16 bit Resolution 10mV Accuracy 0 05 10mV 16 bit Resolution 1mA Accuracy 0 3 0 005A Standard 9 pin D connector Baud rate 9600 Conforming
22. a connection is still not made by the end of the above process or if the LAN connector is physically removed at any time the LAN lamp will go off 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 displays to flash until the command is cancelled ICMP Ping Server The unit contains an ICMP server allowing the instrument to be pinged via either its host name or IP address VXI 11 Discovery Protocol 20 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
23. 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 CPX400DP 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 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
24. age 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 makeshift 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 Earth ground terminal Q Instrument in STAND BY l mains supply ON Ny alternating current ac EC Declaration of Conformity We Thurlby Thandar Instruments Ltd Glebe Road Huntingdon Cambridgeshire PE29 7DR England declare that the CPX400D amp CPX400DP 60V 20A Bench Power Supplies 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 A b EN61326 1 2006 Conducted Class A c EN61326 1 2006 Harmonics referring to EN61000 3 2 2000 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 C
25. age 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 is 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 specifi
26. assively 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 E INSTRUMENT MALE D DCD 1Q O1 RX lt 2 O 2 TX 30 O3 DTR 40 O4 GND 50O O 5 DSR i 6O O 6 RTS 70 O7 oe ae LINKS TO O8 RI 90 NULL OUT PC O9 18 Baud Rate for this instrument is fixed at 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
27. ation Default settings are Vou 1V lour 1A DeltaV 10mV Deltal 10mA Lock cancelled Vtrack cancelled OVP 66V amp OCP 22A Remote interface settings and Output state at power on setting are unchanged by RST Sense settings are as determined by the front panel switches Remote Commands CPX400DP only 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 will 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 te
28. 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 supply 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 dam
29. but this is inevitably increased by the resistance of the connecting leads At high currents this can result in significant differences between the indicated source voltage and the actual load voltage two 5mQ connecting leads will drop 0 2V at 20 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 cable 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 When the rear panel Output terminals are used on the CPX400DP 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 ter
30. cted 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 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 re
31. ed 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 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 23 103 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 t
32. egister 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 Start with the instrument off and with the VIEW and LOCK keys of Output 1 both held down switch the instrument on The display will show Addr inthe Volts display and nn in the Amps display where nn is the present setting default Addr 11 The address can be decremented and incremented by the VIEW and LOCK 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 OVP key the display will show SEt and the new address for approximately 2 seconds returning to the normal Volts and Amps display when the new address has been accepted The address can also be set from the instrume
33. gulated Four selectable ranges 60V 20A 60V 7A 20V 20A and Custom Limits Any V I setting of the 60V 7A or 20V 20A ranges always falls within the appropriate part of the Power Envelope The 60V 20A range permits any setting up to 60V and 20A but the output will become unregulated if operated outside of the Power Envelope see above The voltage and current limits of the Custom Limits range can be set to any Vmax between 0 1V amp 60V and Imax between 0 01A and 20A This facility is most useful in limiting operation to a particular part of the Power Envelope 20V oV 7A Amps 20A Voltage and current settings can be locked by a single button press Lock accuracy is equal to meter accuracy see Meter Specification Electronic Preset voltage and current displayed when off Front panel Universal 4mm safety binding posts on 19mm 0 75 pitch Rear Panel Barrier strip connections CPX400DP only Switchable between local and remote Remote connection by spring loaded push terminals on front panel and barrier strip on rear panel CPX400DP only Forward protection by Over Voltage Protection OVP and Over Current Protection OCP trips Reverse protection by diode clamp for reverse currents up to 3A 1V to 66V set by front panel screwdriver adjustment or via the remote interfaces Setting resolution 100mV Response time Typically 1ms Maximum voltage that should be applied across the terminals is 70V Measure and compare
34. l 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 lt PROGRAM MESSAGE UNIT gt 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 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 lt PROGRAM MESSAGE UNIT gt 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 O otherwise the value of ist is 1 The instrument must also be configured
35. lt nr1 gt lt nr2 gt lt n gt lt RESPONSE MESSAGE TERMINATOR gt 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 1 is the Master left hand output and 2 is the Slave right hand output The commands which 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 lt n gt lt nrf gt V l
36. minals to the load following the guidelines above and set the LOCAL REMOTE switch to REMOTE Series or Parallel connection with other units A 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 The maximum permissible voltage between any terminal and earth ground is 300VDC the maximum permissible voltage between either terminal of one output and either terminal of the other output on the same supply is also 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 13 It should be noted that the unit can only 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 For opti
37. mmand 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 displayed but are placed in the Execution Error Register where they can be read via the remote interfaces see Status Reporting section 31 Maintenance The Manufacturers or their agents overseas will provide repair for any unit developing a fault Where owner 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 Fuse The correct fuse type is 15 Amp 250V HBC time lag 174 x 7 Make sure that only fuses of the required rated current and specified type are used for replacement The use of makeshift fuses and the short circuiting of fuse holders is prohibited To replace the fuse first disconnect the instrument from the AC supply Remove the 6 cover securing screws and lift off the cover Replace the fuse with one of the correct type and refit the cover Note that the main function of the fuse is to make the instrument safe and limit damage in the event of failure of one of the switching devices If a fuse fails it is therefore very likely that the replacement will also blow because the supply has developed a fault in such circumstances the instrument will need to be returned to the manufacturer for service
38. moves any password protection For more information on LXI standards refer to www lxistandard org home 19 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 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 During this time the LAN lamp above the Output 2 meters will be lit and it will stay lit if a LAN connection is successfully made However if
39. mpliance 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 Installation Mains Operating Voltage This instrument has a universal input range and will operate from a nominal 115V or 230V mains supply without adjustment Check that the local supply meets the AC Input requirement given in the Specification 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 Ventilation The power supply is cooled by an intelligent multi speed fan which vents at the rear Take care not to restrict the air inlets at top bottom and side panels or the exit at the rear
40. mum operation connect the power supplies separately to the load Note that the output terminals are rated at 30A maximum if two or more outputs are operated in parallel to source higher currents than this the junction should be made at a separate point not one of the terminals Overvoltage protection OVP is fully variable within the range 1V to 66V The OVP limit is set via the screwdriver adjustable OVP preset potentiometer accessible through a hole in the front panel immediately above the OVP key Rotating the preset clockwise increases the limit which can be read directly on the user display by pressing the OVP key beneath the preset If the voltage on the output exceeds the set OVP for any reason including an externally forced voltage the output will be tripped off Over current protection OCP is implemented in firmware and can only be set and used when under remote control via the RS232 USB LAN LXI or GPIB interfaces CPX400DP only Setting resolution is 10mA and typical response times are 500ms In local mode and for CPX400D OCP is still active but automatically defaults to 22 Amps When the output is tripped the displays will show OUP triP and the OUTPUT lamp will flash Turn the output off the trip message should be replaced with the normal preset V and readings When the cause of the trip has been removed the output can be switched on again Even with the output off the load is still connected to the power supply outpu
41. n section 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 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 gt lt version gt lt rmt gt where lt NAME gt is the manufacturer s name lt model gt defines the type of instrument Serial No is the unique serial number and lt version gt is the revision level of the software installed The format of lt version gt 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 The PSU has no self test capability and the response is always 0 lt rmt gt The PSU has no trigger capability The co
42. ng 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 The VIEW lamp is lit to indicate that it is the preset values that are being displayed 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 fas 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 needs to be set individually Setting Up the Output With the POWER switch on 1 and the OUTPUT switch off the output voltage and current limit can be accurately preset using the VOLTAGE and CURRENT controls the upper meter shows the set voltage and the lower meter shows the set maximum current When the OUTPUT switch is switched on the OUTPUT ON lamp and the CV constant voltage lamp light the upper meter continues to show the set voltage but the lower meter now shows the actual load current Range Selec
43. nt Status Register 1 are set and corresponding bits are set in Limit Event Status Enable Register 1 Status Model C3AHISIHS ai e HE ENTE ae C ALAIdWOO NOILWHAdO gt HOHHIAHINO S q LNOAWIL A1834 300 gt HOHHI NOILNOAXA gt gt HOHHI ANVNNOO c NO HIMOd gt n OUTPUT 2 te Cn ae ESE REG OUTPUT 1 ess TE E mote daAHasau 5 HFE LIM2 LIM1 STATUS BYTE RQS 6 MSS 5 PY TE Te TXT Te eee SRQ 25 Power on and Remote Operation Default Settings 26 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 Registert 0 Execution Error Register 0 Query Error Register 0 0 Parallel Poll 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 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 paragraph in the Manual Operation section The RST reset interface command resets the instrument to the Remote Operation Default settings Remote Oper
44. nt s web pages 17 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 Vrrack status and output states are unchanged but LOCK is cancelled if it was on and both range settings are defaulted to 60V 20A The Sense settings remain as set by the front panel switches The instrument may be returned to the local state by pressing the LOCAL key however 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 on and will leave the outputs in their present state Vrrack if set in remote mode will stay set when returning to Local Output 1 is LOCKed but not Output 2 however it effectively stays locked because it is tracking Output 1 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 P
45. oad but also provides higher resolution analogue control over the specified ranges using the full 300 rotation of the controls To set new CUSTOM LIMITS turn the output off and select the 60V 20A range preset limits are shown in the display Use the MAIN and FINE VOLTAGE controls and the CURRENT control to set precisely the new custom limits required Press and hold the CUSTOM LIMITS key the displays flash the new limits for 2s after which the lower A display shows SEt to indicate that the new limits have been stored Release the key the displays now show the preset V and limits corresponding to the knob settings within the newly defined ranges If the new limits fall outside the power envelope see Power Limit paragraph below such that operation could change from CV or CC Constant Current to UNREGulated power limit under certain load conditions the CUSTOM LIMITS lamp will flash during the setting process to indicate this and will continue to do so until the range key is released If the lamp is constantly on during setting this indicates that Vmax X Imax lt 420W and that operation should therefore generally stay in CV or CC mode CUSTOM LIMITS remains selected until another range key is pressed Reselecting CUSTOM LIMITS with a short key press recalls the same custom limits as last set When CUSTOM LIMITS is selected the limit of the MAIN VOLTAGE control is exactly as set by the above procedure when the FINE control is set at its mid
46. onducted RF Performance levels achieved are detailed in the user manual Safety EN61010 1 Installation Category II Pollution Degree 2 CHRIS WILDING TECHNICAL DIRECTOR 1 July 2010 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 A b Conducted Class A c Harmonics EN61000 3 2 2000 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 A cycle 0 Peformance A B 1 cycle 0 Performance B B 25 cycles 70 Performance A C 250 cycles 0 Performance B C Output status at power up must be set to be same as at last power down d EN61000 4 4 2004 Fast Transient 1kV peak AC line only DC Output connections l
47. point marked on the panel witha e The FINE control itself can be usefully used to give an additional fine adjustment of 1 of the range maximum 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 The CV lamp lights to show constant voltage mode 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 lamp lights to show constant current mode Instantaneous Current Output The current limit control can be set to limit the continuous output current to levels down to 10mA 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 short circuiting of the output will produce a current pulse as the capacitor discharges which is independent of the current limit setting Power Limit The maximum current at different voltage settings is limited by the power envelope illustrated below 60V CPX 400D amp DP Volts Power Envelope 20V oV 7A Amps 20A 12 The power envelope is set to
48. red from a web browser Simple command line control from the browser is also possible 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 request 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 O 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 R
49. rminated by a lt RESPONSE MESSAGE TERMINATOR which is ODH Carriage Return CR followed by OAH Line Feed LF lt WHITE SPACE gt is defined as character codes OOH to 20H inclusive lt WHITE SPACE gt 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 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 lt PROGRAM MESSAGES by the controller each message consisting of zero or more lt PROGRAM MESSAGE UNIT gt elements separated by lt PROGRAM MESSAGE UNIT SEPARATOR gt elements A lt PROGRAM MESSAGE UNIT gt is any of the commands in the remote commands list A lt PROGRAM MESSAGE UNIT SEPARATOR is the semi colon character 3BH lt PROGRAM MESSAGES gt are separated by lt PROGRA
50. t 3m therefore not tested Performance A 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 lt 3m therefore not tested Performance A A t Signal 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 ensure continued co
51. t n gt V lt nrf gt OVP lt n gt lt nrf gt I lt n gt lt nrf gt OCP lt n gt lt nrf gt V lt n gt l lt n gt 28 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 response 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 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 lt n gt DECl lt n gt OP lt n gt lt nrf gt OPALL lt nrf gt OP lt n gt TRIPRST LOCAL IFLOCK IFLOCK IFUNLOCK 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
52. t stage Do not apply external voltages in excess of 70V to the power supply terminals or damage may result The output is protected from reverse voltages by a diode the continuous reverse current must not exceed 3 Amps although transients can be much higher Over temperature Protection Sensors on both the secondary heatsinks will detect over temperature due to blocked air flow 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 The output will remain shut down even after the heatsinks have cooled down When the cause of the over temperature has been removed and the heatsinks have cooled to normal working temperatures the output can be reset by turning the POWER switch to standby ly then on again If either output temperature trips when the instrument is operating in independent mode then the other output will continue to operate normally If however the instrument is operating in Tracking mode then a temperature trip on either output will turn both outputs off OtP trip will show only in the display of the output which caused the trip View Settings 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 VIEW lamp is lit whilst the VIEW key ee LOCAL Hold to Caneel iS pressed 14 Lock Settings Pressing the LOCK
53. 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 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 lt 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 lt n gt voltage by the step size set for output lt n gt Increment the output lt n gt voltage by the step size set for output lt n gt and verify Decrement the output lt n gt voltage by the step size set for output lt n gt Decrement the output lt n gt voltage by the step size set for output lt n gt and verify Increment the output lt n gt current limit by the step size set for output lt n gt decrement the output lt n gt current limit by the step size set for output lt n gt set output lt n gt on off where lt nrf gt has the following meaning 0 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 lt n gt on off status The response is lt nr1 gt lt rmt gt where 1 ON
54. tion amp Custom Limits There are 4 possible ranges selected by the keys immediately below the display the associated lamp lights to show which range is selected Because changing ranges can change the output voltage range changing is only allowed if the output is off If attempts are made to change range with the output on the display will briefly show the message turn oFF and the output lamp will flash to prompt the user to turn the output off The factory default range selection is the 60V 20A o eee _ PowerFlex range which limits the maximum G0V 20A a COVA E ovo ES customLiis Hold current at the set voltage to that determined E Os Las o o toSet by the power envelope or 20A whichever is Ruas the lower see Power Limit paragraph later in this section The 60V 7A and 20V 20A ranges operate conventionally such that Constant Voltage CV operation is possible over the full voltage range provided that the load current is below the range maximum operation is always within the power envelope of the instrument The VOLTAGE and CURRENT controls are always scaled to set the range maximum when fully clockwise 11 The CUSTOM LIMITS capability allows the maximum values of both the VOLTAGE and CURRENT controls to be redefined by the user such that the controls operate over specific lower ranges This not only has the advantage of protecting against the accidental application of for example excess voltages to the l
55. wo channel instrument which is set to parallel mode 104 Command not valid with output on For example using the CONFIG lt nrf gt command to change operating mode without first turning Output 2 off will cause error 104 200 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 O then 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 Set when output enters power limit Unregulated mode 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 O Set when output enters voltage limit CV mode Status Byte Register and Service
56. www Ixistandard org Instrumentldentification 1 0 and the W3C XML Schema Standards http www w3 0rg 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 LAN lamp above the Output 2 meters will be off until the error is corrected If a LAN error occurs check and correct 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 1
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