QPX600D Instruction Manual - English
Contents
1. THURLBY THANDAR INSTRUMENTS QPX600D amp QPX600DP_ __ PowerFlex Dual DC Power Supplies INSTRUCTION MANUAL Table of Contents Specification 2 EMC 6 Safety 7 Installation 8 Connections 9 Initial Operation 11 Manual Operation Independent Mode 13 Manual Operation Link Modes 21 Maintenance 22 Remote Operation 23 Remote Commands QPX600DP only 32 Note The latest revisions of this manual device drivers and software tools can be downloaded from http www tti test com go qsx This manual is 48511 1460 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 Voltage Setting Current Setting Operating Mode Output Switch Output Terminals Sensing Ripple amp Noise 20MHz bandwidth Load Regulation Line Regulation Transient Response Output Protection Over voltage Protection OVP Over current Protection OCP Over temperature Protection Temperature Coefficient OUTPUT SPECIFICATIONS Each Output Two ranges OV to 60V or OV to 80V 0 01A to 50A Up to 600W Resolution 1mV 60V Range 2mV 80V Range Accuracy 0 1 of setting 2mV A 4mV on 80V range 80V Res2. Return the output current step size of output lt n gt 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 step size Increment the output lt n gt voltage by step size with verify Decrement the output lt n gt voltage by step size Decrement output lt n gt voltage by step size with verify Increment the output lt n gt current limit by step size Decrement the output lt n gt current limit by step size Set output lt n gt on off where lt nrf gt has the following meaning O OFF 1 ON Returns output lt n gt on off status The response is lt nr1 gt lt rmt gt where 1 ON 0 OFF OPALL lt nrf gt SENSE lt n gt lt nrf gt RATIO lt nrf gt RATIO VRANGE lt n gt lt nrf gt VRANGE lt n gt CONFIG lt nrf gt CONFIG SAV lt n gt lt nrf gt RCL lt n gt lt nrf gt 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 Set output lt n gt sense mode where lt nrf gt has the following meaning O local 1 remote This command is only valid if operating in mode 0 Voltage Tracking Sets the ratio of V2 V1 to lt nrf gt percent The permitted range is 5 to 2000 providing this would not set V2 to an illegal value otherwise a
3. 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 Set the current meter measurement averaging lave of output lt n gt to lt nrf gt where lt nrf gt has the following meaning O OFF 1 ON Return the set voltage of output lt n gt Response is V lt n gt lt nr2 gt lt rmt gt where lt nr2 gt is in Volts Return the set current limit of output lt n gt Response is l lt n gt lt nr2 gt lt rmt gt where lt nr2 gt is in Amps Return the voltage trip setting of output lt n gt Response is VP lt n gt lt nr2 gt lt rmt gt where lt nr2 gt is in Volts Return the current trip setting of output lt n gt Response is CP lt n gt lt nr2 gt lt rmt gt where lt nr2 gt is in Amps Return the output readback voltage of output lt n gt Response is lt nr2 gt V lt rmt gt where lt nr2 gt is in Volts Return the output readback current of output lt n gt Response is lt nr2 gt A lt rmt gt where lt nr2 gt is in Amps Set the output voltage step size of output lt n gt to lt nrf gt Volts Set the output current step size of output lt n gt to lt nrf gt Amps Return the output voltage step size of output lt n gt Response is DELTAV lt n gt lt nr2 gt lt rmt gt where lt nr2 gt is in Volts
4. limit UNREG mode or for any fault trip The default condition is for LOGIC OUT to be closed for the Output ON loss of AC power which would deactivate the opto is also reliably detected with this setting See Extra Functions section for further details Analogue Control Rear panel connections V CONTROL and CONTROL provide quasi analogue control of the Output Voltage and Current Limit respectively The CONTROL inputs are read 4 times per second by the A to D converter and the output is set according to the selected input scaling The input scaling for both can be set as 0 to 10 Volts or 0 to 5 Volts for maximum output The Analogue Control functions and scaling are both selected from the keyboard see Extra Functions section The COMMON return signal is referenced to the negative output of the power supply Analogue Control is activated from the Bus menu see Remote Operation section When activated the top line of the display shows which functions V and or I have been selected and the corresponding functions on the front panel NUMERIC SET JOG SET for V and or are inhibited to avoid contention between Analogue Control and front panel operation Analogue Monitor 18 The output terminal voltage and output current may be monitored on V MONITOR and MONITOR respectively The output scaling for both will be the same as that set for V CONTROL and CONTROL see above section V MONITOR and MONITOR are always available at the re
5. 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 B 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 2 cycle and 1 cycle 0 Performance B B 25 cycles 70 Performance A C 250 cycles 0 Performance B C if Function 11 is set Output status at power up same as at last power down otherwise Performance C d EN61000 4 4 2004 Fast Transient 1kV peak AC line only DC Output connections lt 3m therefore not tested Performance B B e EN61000 4 5 2006 Surge 0 5kV line to line 1kV line to ground Performance B 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 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 D
6. 2mV the set point will rounded down if necessary to the nearest 2mV figure e g if output is set to 59 997 it will be changed to 59 996 When changing to the low range the display will show Select 0 to 60V range imv resolution OK to confirm ESC to cancel unless the output is set above 60V in which case the display will show Can t select 0 to 60V range Set point too high Esc to cancel The output must first be set to lt 60V before the low range can be selected Set Voltage With the output off the standard status display shows the set voltage Limits shows asa reminder beside OFF in the top line of the display With the output ON the mode changes to CV constant voltage or CI constant current depending on the set current limit and load conditions and the display shows the actual output voltage measured at the sense point note that in Cl mode the actual output voltage will be less than the set voltage Both the set and actual voltage are shown to a resolution of 1mV 0 60V range or 2mV 0 80V range If the set voltage and load conditions cause the instrument to operate outside its guaranteed power range the display will show UNREG unregulated and the actual output voltage will again be less than the set voltage The voltage can be set directly from the numeric keypad press the NUMERIC SET V key enter the new value using the numeric keys and confirm by pressing OK The broad principles of keypad entry are explained in the Ini
7. Input each output A LOGIC IN is connected directly to the input of an isolating opto coupler there is no series resistor The input is activated when a current greater than approximately 1mA is forced between LOGIC IN and LOGIC COMMON The function of LOGIC IN is set from the keyboard Do not force a current exceeding 25mA between the terminals Do not apply a voltage to LOGIC IN LOGIC COMMON exceeding 50V with respect to Logic Output each output A LOGIC OUT is the open collector output of an opto isolated NPN transistor that will sink up to 2mA when active switch closure The function of LOGIC OUT is set from the keyboard The maximum voltage that can be applied between LOGIC OUT and LOGIC COMmon is 30VDC Do not apply external voltages between the terminals exceeding 30VDC Analogue Control each output A V CONTROL and CONTROL provide quasi analogue control of the Output Voltage and Current Limit respectively The CONTROL inputs are read 4 times per second by the A to D converter and the output is set according to the selected input scaling The input scaling for both can be set as 0 to 10 Volts or 0 to 5 Volts for maximum output The Analogue Control functions and scaling are both selected from the keyboard The COMmon return signal is referenced to the negative output of the power supply Do not apply external voltages between the terminals exceeding 20VDC Analogue Monitor each output The output t
8. 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 Output 1 is the left hand output as marked on the front and rear panels 33 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 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 lt 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 DAMPING lt n gt lt nrf gt V lt n gt l lt n gt 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 INCl lt n gt DECl lt n gt OP lt n gt lt nrf gt OP lt n gt Set output lt n gt to lt nrf gt
9. over temperature trip If the unit does not restart after being allowed to cool then another fault might be present and the unit should be returned for service Control Input and Output Digital signal connections LOGIC IN and LOGIC OUT are available on the rear panel press the orange actuators of the screwless terminals insert the connecting wire and release the actuator to secure the connection LOGIC IN is connected directly to the input of an isolating opto coupler there is no series resistor The input is active when an input current greater than approximately 1mA is forced between LOGIC IN and LOGIC COMMON LOGIC IN can be set to enable the output disable the output or be ignored when it is activated see the Extra Functions section Note that LOGIC IN can only be used to enable disable the output if the output has already been turned ON with the front panel key or by remote interface command this permits the front panel key to be used to turn the output off in an emergency i e to override LOGIC IN Note also that having turned the output ON with the key the ON lamp remains lit even when the output is disabled by the LOGIC IN signal LOGIC OUT is an isolated rear panel open collector output that will sink up to 2mA when active switch closure the maximum voltage that can be applied to LOGIC OUT is 30Vdc LOGIC OUT can be set to be closed or open for output enabled or disabled current limit Cl mode power
10. range error is generated If output 2 is enabled changing the ratio will immediately change the output voltage on V2 In mode 0 Voltage Tracking returns lt nr2 gt the ratio between the set points of V1 and V2 In all other modes returns 1 to indicate that this command is not valid in the current mode Set output lt n gt voltage range to lt nrf gt Where lt nrf gt is 1 for low range 0 to 60V and 2 for high range 0 to 80V Note trying to change to the low range while the output is set above 60V is illegal and will generate execution error 103 Returns the voltage range for output lt n gt The response is lt nr1 gt lt rmt gt where lt nr1 gt is 1 for low range 0 to 60V and 2 for high range 0 to 80V Sets the configuration of the unit to lt nrf gt where lt nrf gt has the meaning defined in Operating Modes above Returns the configuration of the instrument The response is lt nr1 gt lt rmt gt where lt nr1 gt has the meaning defined in Operating Modes above 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 System and Status Commands CLS ESE lt nrf gt ESE ESR IST OPC OPC Clear Status Clears the Status structure this indirectly clears the Status Byte register Set Event Status Enable Regi
11. 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 Status Reporting QPx600DP only 28 A separate error and status model is maintained for each interface instance an interface instance is defined as a potential connection USB GPIB and RS232 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 is read and cleared by the ESR command The Standard Eve
12. 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 27 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 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 sta
13. the top right hand side of each output s display However the user can change this default setting such that the power down status of the individual outputs and of the tracking mode are restored at power up see the Extra Functions section Each DC Output is switched on and off electronically with alternate presses of its key the ON lamp illuminates when the Output is on At the same time the message above the VOLTS and AMPS display changes from OFF to CV constant voltage or CI constant current to indicate the present operating mode should the load cause the instrument to operate outside its guaranteed power range the display will instead show UNREG unregulated Alternatively the BOTH ON or BOTH OFF keys can be used to switch both outputs on or off together the outputs switch synchronously within lt 10us of each other Note that if one output is already on and the other off BOTH ON will turn the off output on and BOTH OFF will turn the on output off Select Output The output to be adjusted is selected by pressing CONTROL 1 or CONTROL 2 the corresponding LED lamp will light to show which output is currently under the control of the numeric keypad or rotary control Note that the individual ON keys as well as the BOTH ON and BOTH OFF keys will always operate regardless of which output is currently selected by the CONTROL keys Control of Output 1 is the default setting at power up Keypad Only the principles of op
14. 1 0 OCP OVP UNREG Cl CV 7 6 5 X TRIP SENSE a oO na Taea aQ E Z Z Uw E e ae r I OQO O E E E k k Wi uw m lw X 5 S sE 9 FO 9 2 0 G 5 5 ul uw zZ W lt oe we Re E G Status Registers a q0 TE cO Q e g ESR Standard Event Status Register Oo gt e w ESE Standard Event Status Enable Register ad ow m a 9 STB Status Byte w uU gt oe SRE Service Request Enable Register 5 0 5 O0 O gt LSR1 LSR2 Limit Status Registers LSE1 LSE2 Limit Status Enable Registers Power on Settings 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 Parallel Poll Enable Register t 0 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 keyboard 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 to the same at power on as at switch off 31 Remote Commands QPX600DP only 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 in
15. 83 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 where X xx is the revision of the firmware for example THURLBY THANDAR QPX600DP 279730 1 00 The 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 www xistand
16. M port irrespective of which physical USB port it is connected to LAN Interface QPX600DP only The LAN interface is designed to comply with the LXI standard version 1 2 Class C 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 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
17. afety 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 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 ex
18. agraph in the LAN Interface section for details During other operations however the display capabilities are used more extensively to show for example prompts during function settings e g memory store and recall operations or the extra functions accessed via the shift function details are given in the relevant sections of this manual The display contrast is set at the factory but can be adjusted from the keyboard to optimise it for particular ambient operating conditions Press SHIFT select Extra Function 90 and follow the on screen prompts Contrast can be adjusted independently for the two displays Manual Operation Independent Mode New users should first read the Initial Operation chapter which describes the operating principles of the keypad and rotary jog control The default mode at power up is Tracking Off i e the two outputs are fully independent The following sections describe operation of either output in this mode See the later Manual Operation Link Menu chapter for details of the various tracking modes that can be set Set Voltage Range There are two voltage ranges for each output a low range 0 to 60V and a high range 0 to 80V To select the range press SHIFT followed by RANGE Changing to the higher range is always possible and the display will show Select 0 to 80V range 2mV resolution OK to confirm ESC to cancel pressing OK accepts the change Because the resolution of the 80V range is
19. ar panel terminals The COMMON return signal is referenced to the negative output of the power supply Store Settings The instrument can store 10 set ups in non volatile memory the parameters stored are voltage current limit OVP and OCP The output state and remote sense setting are not stored To store a set up press SHIFT STORE to show the store locations and the currently saved set ups on the Store screen The store location to be used can be selected directly by pressing any key 0 9 or by scrolling to the appropriate store number in the list using the JOG SET control the selected store is indicated by the square brackets at that location Press OK to store the set up at the selected location the screen returns to the standard status display A full store can be overwritten with new settings At any time before the OK key is pressed the store function can be exited without saving a set up by pressing ESCAPE or by waiting for the operation to time out Deleting Stored Settings Any store can be returned to empty as follows press SHIFT STORE and select the appropriate store number as described in the Store Settings section above at that point press followed by OK to confirm the operation At any time before the OK key is pressed the delete function can be exited without erasing a set up by pressing ESCAPE or by waiting for the operation to time out Recall Settings To recall a set up press SHIFT RECALL to show the st
20. ard 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 GPIB Interface QPX600DP only 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 Query Error Register GPIB IEEE Std 488 2 Error Handling The IEEE 488 2 UNTERMINATED error addressed to talk with nothing to say is handled as follows If the instrument is addressed to
21. articular 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 If analogue is selected then the digital interfaces QPX600DP only may be used to query the instrument but not to change any settings Interface Locking QPX600DP only 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 0 if the interface is free and 1 if the lock is owned by the requesting interface instance 23 Sending any command from an interface without contro
22. ault settings with the exception of all remote interface settings See Factory Default Settings section Attempt to clear all trip conditions Go to local Request Instrument lock This command requests exclusive access control of the instrument The response is 1 is 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 interface instance 0 if there is no active lock or 1 if the lock is unavailable either because it is in use by another interface or the user has disabled the interface from taking control via the web interface Release the lock if possible Returns 0 if successful If this command is unsuccessful 1 is returned 200 is placed in the Execution Error Register and bit 4 of the Event Status Register is set indicating that you do not have the authority to release the lock Query and clear the Execution Error Register The response format is lt nr1 gt lt rmt gt See Error Reporting section for details of the response Query and clear the Limit Status Register lt n gt The response format is lt nri gt lt rmt gt See Status Reporting section for details of the response Set the Limit Status Enable Register lt n gt to lt nrf gt Returns the value in th
23. ck kit EC Declaration of Conformity We Thurlby Thandar Instruments Ltd Glebe Road Huntingdon Cambridgeshire PE29 7DR England declare that the QPX600DP amp QPX600D 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 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 Performance levels achieved are detailed in the user manual Safety EN61010 1 Installation Category II Pollution Degree 2 i i i CHRIS WILDING TECHNICAL DIRECTOR 2 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 ClassA b Conducted Class A c Harmonics EN61000 3 2
24. cording to the selected input scaling similarly the monitor outputs are updated four times per second with values representing the actual output voltage and current These signals are referenced to the negative output and have a range of 0 to 10V or 0 to 5V selectable via the keyboard Analogue Control Accuracy Voltage 0 3 4mV Current 0 5 40mA Analogue Monitor Accuracy Voltage 0 3 4mV Current 0 5 40mA LINK MODES In addition to independent output operation the instrument is capable of operating in a number of different voltage tracking modes which can be activated from the LINK MENU These modes include Output 2 voltage V2 tracking Output 1 voltage V1 by any ratio in the range 5 to 2000 V2 and I2 set to track V1and 11 1 1 with total V1 V2 displayed useful when Output 1 and Output 2 are series connected V2 and I2 set to track V1and 11 1 1 with total 11 12 displayed useful when Output 1 and Output 2 are parallel connected KEYBOARD amp ROTARY CONTROL All functions including the selection and set up of the remote control interfaces can be set from the keyboard The rotary Jog control can be used to adjust output voltage and current settings in a quasi analogue mode The output to be controlled is first selected with the appropriate Control key DISPLAY FEATURES The displays one for each output are graphic LCDs backlit by white LEDs contrast is software controlled and can be adjusted from the ke
25. ction 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 aNd INSTRUMENT ye gt DCD 1 O1 RX 2 2 TX 30 O3 DTR 4 Q4 GND 5 5 DSR t 6 O6 RTS EE O7 CTS i 8 O 8 LINKS TO Al i 90 NULL OUT PC O9 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 24 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 USB Interface QPX600DP only The USB interface allows the instrument to be controlled using RS232 protocol via a computer s USB port 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 d
26. d and inaccessible to the touch Always make connections to the instrument with the OUTPUT off Select remote sense by pressing SHIFT SENSE the message Turn On Remote sense OK to confirm ESCAPE to cancel is shown in the display and the OK lamp flashes Press OK to confirm or press ESCAPE to exit without changing state R SNS Remote Sense shows in the display beside the output status OFF CV CI or UNREG when remote sense is selected Remote sense is turned off by pressing SHIFT SENSE again the message Turn Off Remote Sense OK to confirm ESCAPE to cancel is shown in the display and the OK lamp flashes Press OK to confirm or press ESCAPE to exit without changing state the R SNS indication in the display goes off when remote sense is deselected To avoid instability and transient response problems care must be taken to ensure good coupling between each output and sense lead this can best be done by twisting the leads together 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 Sense Miswiring Trip The output will be tripped off if the voltage between an output terminal and its corresponding sense terminal exceeds approximately 1V this will happen if the sense wires are wired at the load to the wrong output or if an attempt is made to draw power from the sense wires If the sense terminals are miswired in this way the output is tur
27. e 4 times per second but the value displayed is the rolling average of the last 4 current measurements made 15 Connection to the Load The load should be connected to the positive red and negative black OUTPUT terminals Both are fully floating and either can be connected to ground Warning Voltages above 70Vdc are hazardous live according to EN 61010 1 and great care must be taken when using the power supply at voltages above this level Always make connections to the instrument with the OUTPUT off Remote Sensing The instrument has a very low output impedance but this is inevitably increased by the resistance of the connecting leads and the contact resistance between terminals and leads At high currents this can result in significant differences between the indicated source voltage and the actual load voltage even two 2mQ connecting leads will drop 0 2V at 50 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 capability This requires the sense terminals to be connected to the output at the load instead of at the source insert wires into the REMOTE SENSE terminals and connect directly to the load Warning Voltages above 70Vdc are hazardous live according to EN 61010 1 and great care must be taken when using the power supply at voltages above this level Ensure that the exposed end of the wire is fully inserte
28. e value in the Limit Status Enable Register lt n gt The response format is lt nr1 gt lt rmt gt Query and clear Query Error Register The response format is lt nr1 gt lt rmt gt Miscellaneous Commands IDN TST TRG ADDRESS 36 Returns the instrument identification The exact response is determined by the instrument configuration and is of the form lt NAME gt lt model gt 0 lt version gt lt rmt gt where lt NAME gt is the manufacturer s name lt model gt defines the instrument type and lt version gt is the revision level of the software installed The PSU has no self test capability and the response is always 0 lt rmt gt The PSU has no trigger capability The command is ignored in this instrument Returns the bus Address The response is lt nr1 gt lt rmt gt 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 1460 Issue 2
29. ented or decremented in steps with a resolution set by the JOG SET keys the output immediately follows the setting i e no OK is required Press CONTROL 1 or 2 to select the output to be adjusted At power up jog is always off To jog the voltage or current setting press the V or JOG SET key the associated lamp will illuminate and the appropriate parameter display now changes to two lines With the output ON the top line continues to show the actual output but the additional lower display now shows the present Limits value in the lower display the JOG indicator is positioned under the digit that was last jogged Whilst the V or JOG SET indicator is lit each further press of the V or key moves the JOG indicator one digit to the left the selection wraps round such that when the largest value of jog increment has been reached the next press returns it to the lowest The default position at power up is under the LSD i e the lowest jog increment is selected Turning the rotary jog control clockwise anti clockwise increments decrements the selected digit digits to the left of the one being jogged are automatically incremented decremented when the decade overflow underflow point is reached Digits to the right of the one being jogged remain unchanged unless the jog step overflows underflows the maximum minimum settings in which case they are set to zero For example 59 861V goes to 59 961V goes to 60 000V for a 0 1V jog increment 1 60A
30. eration are outlined here the setting of individual parameters is given in detail in later sections The paramount consideration in designing the user interface has been to make changing settings as safe as possible i e with minimal risk of accidentally applying excessive voltages to a load whilst achieving ease of use This has been achieved by requiring the user to confirm OK new numeric settings with the option to ESCAPE at any point or even to simply pause until the operation times out and the instrument returns to its original settings In addition display messages and LED indicators prompt guide or warn the user such that entry or control errors are minimised Where some of these features e g beeps are considered unnecessary by regular users the option exists to disable them see the Extra Functions section Press CONTROL 1 or 2 to select the output to be adjusted Under normal conditions the numeric keypad is disabled any numeric key presses will simply be ignored To set a voltage with the keypad first press the V NUMERIC SET key the VOLTS display changes to show the present set value in a smaller font with the message Enter V or ESC below it and the OK lamp starts flashing The new value is then entered from the keyboard as it is entered it is displayed directly below the present setting replacing the prompt message At any time during entry the new setting can be confirmed with the OK key e g it is sufficient to key in 1 OK t
31. erminal voltage and output current may be monitored on V MONITOR and MONITOR respectively The output scaling for both is the same as that set for V CONTROL and CONTROL see previous section The COMmon return signal is referenced to the negative output of the power supply Do not apply external voltages to these terminals RS232 QPX600DP 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 QPX600DP 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 QPX600DP 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 protoco
32. es information on the unit and allows it to be configured from a web browser Simple command line control from the browser is also possible Analogue remote control is activated from the BUS menu but the functions V and or and scaling are set from the Extra Functions menu see previous section Bus and Address Selection Press SHIFT BUS to display the bus menu 1 Digital or None on QPX600D 2 Analogue OP1 only 3 Analogue OP2 only 4 Analogue OP1 and OP2 only The present selection is indicated with a Vv The bus class can be changed directly by keying in the number 1 to 4 beside the class or by moving to the required type using the JOG SET control the selected bus is indicated by the square brackets Press OK to select the bus class At any time before the OK key is pressed the selection can be exited without change by pressing ESCAPE If any Analogue combination 1 2 or 3 has been selected or None on QPX600D pressing OK returns the display to the standard status screen If Digital has been selected QPX600DP only pressing OK changes the display to show the current digital interface Address andthemessage Set Address with Jog Change the address using the JOG SET control Press OK to confirm and return to the standard status screen Setting the address is essential for GPIB operation but use can be made of the ADDRESS command over any of the other interfaces to easily identify which instrument is being controlled by a p
33. goes to 0 60A goes to 0 01A for a 1A jog decrement The jog steps that can be selected are 1mV 10mV 100mV and 10mA 100mA 1A To disable the jog rotary control press the JOG SET OFF key reselecting JOG SET V or will enable jog on the last used digit position Jog is not cancelled by using numeric entry or any of the SHIFT functions but it is disabled whilst that function is enabled Jog is disabled when control is switched to the other output using the CONTROL 1 or 2 keys but is automatically enabled again when control is switched back Note that the dual display of the parameter being jogged is primarily of use if the output is ON with the output off both lines of the display show the Limits value and change simultaneously as the parameter is jogged Display 12 At power up the display briefly shows the instrument model number and installed firmware revision in the left hand display before both displays revert to the standard status display The standard status display shows the voltage range and output voltage on the left above the front panel VOLTS marking and the current on the right above the front panel AMPS marking together with the present output status i e OFF CV CI or UNREG if the output is off then Limits is also shown in the display above the V and I values The status of the LAN connection is also shown in the top left corner of the display as required for LXI compliance Refer to the LAN Status Indication par
34. h the END message NL END 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 Operating Modes There are five operating modes for the instrument listed in the following table of which four may be selected under digital remote control Voltage Tracking Output V2 tracks V1 at a fixed ratio of 5 to 2000 This mode can only be entered if both V1 and V2 are set to gt 1 volt The ratio is automatically set on entry to this mode to match the existing ratio of V2 to V1 This is the only mode where the RATIO and RATIO commands are legal Single Output This is mode reserved for single output power supplies and cannot be set on this instrument Dual Output Tracking Off In this mode the two outputs operate fully independently This is the only mode where commands that change V2 directly are allowed i e V2 V2V DECV2 DECV2V INCV2 INCV2 and DELTAV2 Track Voltage and Current Displaying combined Voltage This mode can only be entered if both outputs are off Once entered it is not possible to set V2
35. h the command was too big or too small Includes negative numbers illegal store numbers numbers gt 1 where only 0 and 1 are allowed etc 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 Arecall of set up data has been requested but the store specified does not contain any data 103 Command Invalid The command is recognised but is not valid in the current circumstances Typical examples would by trying to change V2 directly while the outputs are linked or changing the ratio when the outputs are unlinked This error will also be generated when trying to select ratio tracking if either output is below 1V 200 Read Only An attempt has been made to change the instruments settings from an interface without write privileges See Interface Locking section for details Limit Event Status and Limit Event Status Enable Registers This pair of registers are implemented for each output as an addition to the IEEE Std 488 2 Their purpose is to inform the controller of entry to and or exit from current or voltage limit conditions and the history of protection trip conditions since the last read Any bits set in the Limit Event Status Register LSR lt n gt which correspond to bits set in the Limit Event Status Enable Register LSE lt n gt will cause the LIM lt n gt bit
36. he OVP has been removed or the OVP limit changed the output can be turned on again Note also that it is possible and valid to set OVP below the set voltage If the supply is in constant current mode the output voltage will be below the set voltage OVP could be set such that is was above the actual output voltage but below the set voltage This could be used to trip the output under a fault condition which caused the load impedance to increase and the actual output voltage to therefore rise above the OVP point Over Current Protection Over Current Protection OCP can be set from 2 0A to 55 0A If the output current exceeds the set OCP the output is shut down typically within 100ms To set OCP press SHIFT OCP The display changes to show only the present OCP setting together with the prompt Numeric Entry Range 2 55 the OK lamp flashes Enter the new OCP value using the numeric keypad exactly as described for setting the current limit and press OK to confirm the new setting to exit without entering a new value press ESCAPE The factory default setting is 55 0V If the OCP is tripped the display shows the message OCP Press ESC to Reset and the output is turned off Pressing ESCAPE at this point removes the message and the display now shows the preset voltage and current limit When the cause of the OCP has been removed or the OCP limit changed the output can be turned on again Note also that it is possible and valid to set OCP bel
37. he 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 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 qsx 22 Remote Operation The QPX600DP can be remotely controlled via its RS232 USB GPIB LAN or Analogue interfaces the QPX600D has Analogue interfaces only 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 provid
38. here are 5 options listed below Tracking Off Entering this mode is always possible because it sets both outputs to independent control Entering this mode does not change the settings on either output Track Voltage V2 V1 Entering this mode is only possible if Output 2 is off Entering this mode sets V2 to match the set point of V1 It does not automatically change the range on Output 2 to match Output 1 so this mode cannot be entered if V1 is set above 60V unless the 0 80V range is first selected for V2 Track Existing Voltage Ratio Entering this mode puts V2 under the control of V1 by a fixed ratio The ratio is determined on entry both V1 and V2 must be gt 1V to enter this mode to permit the ratio to be determined with sufficient accuracy Track V amp I Show Total V To enter this mode both outputs must be off on entry the set points for V2 12 and V2 range are copied from Output 1 The individual output enable buttons no longer work and the BOTH ON and BOTH OFF buttons must be used instead The display shows the individual figures for voltage and current on each output together with the sum of the two voltages This mode is useful if the two outputs are wired in series to produce a high voltage output Note there is no connection between the two outputs internally Track V amp I Show Total To enter this mode both outputs must be off on entry the set points for V2 12 and V2 range are copied from Outp
39. ication This area remains blank LAN Identify The instrument s main web page has 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 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 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 RPC11
40. ill follow the current limit value being Jogged in the lower display Note that the dual display during JOG SET is primarily of use if the output is ON with the output off both lines of the display show the Limits value and change simultaneously as the current limit is jogged 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 a 80V 60V QPX600D amp DP Volts Power Envelope VI La OV 7 5A Amps 50A The power envelope is set to give 80V 7 5A and 10V 50A under all supply conditions both outputs loaded at lower output voltages the output power is restricted by the 50A 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 19 load 20 Amps will flow and the supply will be in CV mode As the voltage across the load is increased the power in
41. it 2 Bit 1 Bit O Not used 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 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 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 Not used Not used LIM2 This will be set if any bits in the Limit Event Status register for output2 are set and corresponding bits are set in the Limit Event Status Enable register LSE2 LIM1 This will be set if any bits in the Limit Event Status register for output1 are set and corresponding bits are set in the Limit Event Status Enable register LSE1 Status Model THER TRIP E G OTP ENSE TRIP ESERVED CURRENT REGULATION POWER ON UNUSED ALWAYS 0 COMMAND ERROR EXECUTION ERROR VERITY TIMEOUT UNUSED ALWAYS 0 OPERATION COMPLETE OVER CURRENT TRIP OVER VOLTAGE TRIP POWER LIMIT VOLTAGE REGULATION 7 z O WN 6 5 4 3 2 1 7 6 5 4 3 2 ESR PON URQ CME EXE DDE QYE RQC OPC xX TRIP SENSE OCP OVP UN LSR2 LSR1 4 3 2
42. l 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 QPX600DP only The GPIB signal grounds are connected to the instrument ground The implemented subsets are SH1 AH1 T6 L4 LEO SR1 RL2 PP1 DC1 DTO CO E2 The GPIB address is set from the front panel 10 Initial Operation This section of the manual is a general introduction to the controls and operation of the instrument and is intended to be read before using the power supply for the first time In this manual front panel keys connections and indicators are shown in capitals e g ESCAPE JOG SET OUTPUT ON Messages shown on the display are printed in a different type font e g Enter V Limits CV Store Switching On Output On Off The power switch is located at the bottom left of the front panel At power up the default behaviour is for the instrument s settings to be restored to those automatically saved when it was switched off but with the outputs in independent mode and always off OFF is shown at
43. l 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 Remote Local Operation QPX600DP only At power on the instrument will be in the local state In this state all keyboard 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 shown in the top line of the display In this state the keyboard is locked out and remote commands only will be processed 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 RS232 Interface QPXx600DP only 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 conne
44. nder 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 BH lt PROGRAM MESSAGES gt are separated by lt PROGRAM 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 wit
45. ned off and the message Sense Error Check Connections is displayed Pressing ESCAPE at this point removes the message and the display now shows the preset voltage and current limit When the cause of the trip has been corrected the output can be turned on again 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 300VDC A N The maximum permissible voltage between any terminal and earth ground en is 300VDC Warning Voltages above 70Vdc are hazardous live according to EN 61010 1 and great care must be taken when using the power supply at voltages above this level Always make connections to the instrument with the OUTPUT off 16 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 Note that the output terminals are rated at 60A maximum if several ou
46. nt 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 Bit6 Not used Bit5 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 Bit4 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 Bit3 Verify Timeout Error Set when a parameter is set with verify specified and the value is not reached within 5 secs e g output voltage is slowed by a large capacitor on the output Bit2 Query Error Set when a query error occurs The appropriate error number will be reported in the Query Error Register Bit1 Not used BitO 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 0 for all interface instances Error messages have the following meaning 0 No error encountered 1 9 Indicates a hardware error has been encountered 100 The numerical value sent wit
47. nt limit Buzzer on A single beep indicates a wrong entry factory default Buzzer off V CONTROL and CONTROL both selected factory default V CONTROL only selected CONTROL only selected V CONTROL and CONTROL scaling 0 to 10 Volts factory default V CONTROL and CONTROL scaling 0 to 5 Volts LOGIC IN ignored factory default LOGIC IN active enables output LOGIC IN active disables output Tracking always off i e independent mode at power up factory default Tracking at power up same as at last power down LCD contrast adjustment Restores factory defaults including these settings Enter calibration mode Refer to Service Manual Factory Default Settings The ex factory default settings which will apply at first power up are as follows Voltage Current Limit OVP OCP Output Settings 20 0 000V 1 00A 90 0V 55 0A Output off local sense damping off 10 20 30 40 50 60 70 active Manual Operation Link Modes In addition to independent output operation described in the Manual Operation Independent Mode chapter the instrument is capable of operating in a number of different tracking modes which can be activated from the LINK MENU If either output is under analogue control then pressing LINK MENU displays Analog Control No link possible Providing analogue control is not been selected for either output the LINK MENU will open showing which modes are currently possible T
48. o change the setting to 1Volt When OK is pressed the display reverts to show just the new setting in the full size font and the OK lamp stops flashing if OK is not pressed within 10s of the last numeric key the entry is cancelled and the display returns to its original setting If ESCAPE is pressed anytime in the entry procedure entry is cancelled and the display returns to its original setting The current limit is set in exactly the same way after first pressing NUMERIC SET The OK key is used to confirm most keypad entries At all other times it becomes the VIEW V I LIMITS key and pressing it will cause the display to show preset output voltage and current limit for 3 seconds during this period the Limits message shows in the display 11 Pressing SHIFT illuminates the A lamp and gives the numeric keys the functions marked above them e g STR Store RCL Recall etc When a shift function is selected SHIFT is cancelled the A lamp is no longer lit The further key presses required to complete the selected function are described in detail in the sections that follow if no key is pressed within 10 seconds to complete the function the function will terminate as if ESCAPE has been pressed SHIFT is a toggle key pressing SHIFT again when it has been selected will cancel SHIFT SHIFT is also cancelled by ESCAPE or by pressing SET V or SET I Jog Control The rotary jog control permits the output voltage or current limit to be increm
49. oint or trying to enter more than 4 digits will cause the buzzer to beep the last key entry will be ignored The current limit can also be set using the rotary jog control Pressing JOG SET will illuminate the JOG SET lamp and the AMPS display will again change to two lines With the output ON the top line continues to show the actual output but the additional lower display now shows the present current limit in the lower display the JOG indicator is positioned under the digit that was last jogged Whilst the SET lamp is lit each further press will move the JOG indicator one digit to the left the selection wraps round such that when the largest value of jog increment has been reached the next press returns it to the lowest The default position at power up is under the LSD i e the lowest jog increment is selected The jog steps that can be selected are 10mA 100mA and 1A With jog enabled the current limit can be incremented or decremented with the rotary jog control with a step resolution indicated by the position of the JOG indicator The output immediately follows the setting i e no OK is required With the output ON and in CV mode the upper line of the display showing actual current will be a lower value than the current limit being Jogged in the lower display however if the output goes into constant current mode indicated by the CV status message being replaced by Cl the upper display showing actual current w
50. olution 10mA Accuracy 0 3 of setting 20mA 60V Constant voltage or constant current with automatic cross over provided that the power demanded stays within the power envelope see graph Outside of this envelope the output 10V becomes unregulated CV CI or UNREG mode indication in display QPX600D amp DP Power Envelope per channel Volts oV 7 5A Amps 50A Independent electronic switching with ON indication In addition BOTH ON and BOTH OFF keys permit both outputs to be switched on off synchronously 10us Preset voltage and current displayed when off Rear panel safety terminals accepting 6mm wire diameter 6mm plugs or 8mm spades at 50 Amps max or 4mm plugs at 30 Amps max Switchable between local and remote Screwless remote sense terminals on rear panel Sense miswiring trip and indication Typically lt 3mVrms lt 20mV pk pk at maximum load CV mode Change in output for any load change within PowerFlex envelope using remote sense Constant voltage lt 0 01 5mV Change in output for a 10 line change Constant voltage lt 0 01 5mV lt 2ms to within 100mV of set level for a 5 to 95 load change Output will withstand an applied forward voltage of up to 90V Reverse protection by diode clamp for reverse currents up to 3A Range 2V to 90V Resolution 0 1V accuracy 0 2 0 2V Response time typically 100us Range 2A to 55A Resolution 0 1A accuracy 0 5 0 2A Response time ty
51. or I2 or turn the outputs on and off independently Output 2 will always match output Note This mode is useful if the outputs have been wired in series Track Voltage and Current Displaying combined Current This mode can only be entered if both outputs are off Once entered it is not possible to set V2 or I2 or turn the outputs on and off independently Output 2 will always match output Note This mode is useful if the outputs have been wired in parallel Analog control active This mode cannot be set but is returned if either output is under analogue control Command List This section lists all commands and queries implemented in this instrument The commands are listed in alphabetical order within the function groups 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 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 2e1 and 120e 1 are all accepted as the number 12 Any number when received is converted to the required precision consistent with the use then rounded up to obtain the value
52. ore locations and the currently saved set ups on the Recall screen Each store location is displayed with its output voltage current limit OVP and OCP settings the output status on off and sense settings local remote are not stored Empty store locations are shown without data The store location containing the setting to be recalled can be selected directly by pressing any key 0 9 or by scrolling to the appropriate store number in the list using the JOG SET control the selected store is indicated by the square brackets at that location Press OK to recall the set up at the selected location the screen returns to the standard status display Settings may be recalled with the output on or off Extra Functions Options for extra functions such as LOGIC CONTROL and ANALOGUE CONTROL MONITOR plus variations on some of the factory default functions can be set by the user by using the extra functions facility The complete list of functions is accessed by pressing SHIFT the required function can be selected directly by entering nn from the keyboard where nn is the 2 digit number in the list below or by scrolling to the appropriate function in the list using the JOG SET control the selected function is indicated by the square brackets at that position in the list Press OK to initiate the selected function following the on screen prompts where appropriate At any time before the OK key is pressed the extra function can be exi
53. ow the set current limit For example the power supply may be used to repetitively test a unit under test UUT which normally takes a peak current of say 10 Amps However a faulty UUT would take a current of more than 10 Amps and would be damaged by being left in a 10 Amp current limited state In this case the current limit could be set to 11A say and the OCP set to 10A to ensure that a faulty UUT will trip the supply off 17 Output Protection In addition to OVP and OCP for forward over voltage and over current protection 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 Temperature Trip and Other Faults Logic If the safe internal temperature limit is exceeded because for example the fan vents have been blocked the output is automatically tripped off The display will show a message indicating that a fault has occurred and that the AC supply must be turned off and on again to reset the unit If over temperature is suspected the cause of the fault should be rectified and the unit allowed to cool before the AC supply is turned on again Note that an over temperature trip shuts down the primary side of the instrument and it is that condition that is detected and causes the fault message to be displayed However other faults may occur which would also cause the primary side to shut down and these will not be distinguishable from an
54. pically 100ms The output will be tripped off if a fault causes the internal temperature to rise excessively Typically lt 100ppm C METER SPECIFICATIONS Each Output Display Type 5 digit Volts 4 digit Amps black on white backlit LCD Voltage Resolution 1mV CI Mode and Unreg Accuracy 0 1 of reading 2 digits Current Resolution 10mA CV Mode and Unreg Accuracy 0 3 of reading 2 digits VXA Resolution 0 1W Accuracy 0 5 0 1W VIA Meter shows calculated nominal V A value together with uncertainty range 5 digit resolution LOGIC CONTROL INPUT and OUTPUT Each Output LOGIC IN is a rear panel opto isolated input that is activated at an input current greater than approximately 1mA User can set LOGIC IN via the keyboard to enable the output disable the output or be ignored when it is activated LOGIC OUT is an isolated rear panel open collector output that will sink up to 2mA when activated switch closure the maximum voltage that can be applied to LOGIC OUT is 30VDC User can set LOGIC OUT to be closed or open for output enabled or disabled current limit Cl mode power limit UNREG mode or for any fault trip ANALOG REMOTE CONTROL and MONITORING Each Output Non isolated quasi analogue inputs and outputs to set voltage and current limit and to monitor actual output voltage and current The control inputs are read four times per second by the A D converter and the output is set ac
55. pose 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 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 mains supply OFF mains supply ON alternating current ac oH direct current dc Caution risk of danger Refer to the documentation this manual to find out the nature of the potential hazard and any actions which have to be taken gt Installation Mains Operating Voltage This in
56. rced cooling Connections Rear Panel Connections Output Terminals each output A A The load should be connected to the positive red and negative black terminals marked OUTPUT The terminals accept 4mm plugs into the end but note that 4mm plugs will only support 30 Amps 6mm diameter wire or plugs into the cross hole or 8mm spade connections with a maximum blade width of 16mm The wiring and connectors must be capable of supporting the current required for 50 Amps 6mm cable is needed Remote sense connections to the load if required are made from the positive and negative REMOTE SENSE terminals Remote sense operation is selected from the keyboard or via a remote control interface R SNS Remote Sense shows in the display beside the output status OFF CV CI or UNREG when remote sense is selected and goes off when remote sense is deselected L The M4 threaded opening marked provides a connection point to safety earth ground Warning Voltages above 70Vdc are hazardous live according to EN 61010 1 and great care must be taken when using the power supply at voltages above this level Always ensure that connections to the terminals are only made in a manner that does not compromise the protection provided by the terminals themselves Ensure that the contact parts of all connecting wires are fully inserted and inaccessible to the touch Always make connections to the instrument with the OUTPUT off Logic
57. river 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 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 CO
58. rt 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 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 ar X omnee S SE bit 6 Parallel poll enable sense of the response bit 0 low 1 high bt2 bit 1 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 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 will then be OOH if RQS is 0 and 01H if RQS is 1 During parallel poll
59. ster to the value lt nrf gt Report value of Event Status Enable Register Query and clear the Event Status Register The response format is lt nr1 gt lt rmt gt See Status Reporting section for details of the response Returns ist local message as defined by IEEE Std 488 2 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 is available immediately the command is executed because all commands are sequential 35 PRE lt nrf gt PRE SRE lt nrf gt SRE STB WAI RST TRIPRST LOCAL IFLOCK IFLOCK IFUNLOCK EER LSR lt n gt LSE lt n gt lt nrf gt LSE lt n gt QER Set the Parallel Poll Enable Register to the value lt nrf gt Report the value in the Parallel Poll Enable Register The response is lt nr1 gt lt rmt gt Sets the Service Request Enable Register to lt nrf gt Report the value in the Service Request Enable Register Response is lt nr1 gt lt rmt gt Report the value of the Status Byte Response is lt nr1 gt lt rmt gt Wait for Operation Complete true This command does nothing because all operations are sequential Resets the instrument to the factory def
60. strument 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 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 Arack kit for mounting in a 19 rack is available from the Manufacturers or their overseas agents Ventilation The power supply is cooled by intelligent multi speed fans which vent at the rear Take care not to restrict the air inlets at the front top bottom amp side panels or the exit at the rear In rack mounted situations allow adequate space around the instrument and or use a fan tray for fo
61. strument 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 terminated 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 32 GPIB input to the instrument is buffered in a 256 byte input queue which is filled u
62. ted without implementation by pressing ESCAPE or by waiting for the operation to time out Selected functions are indicated by a V beside the code in the on screen list Note that the options within any decade group are mutually exclusive and selecting a function within any group will automatically deselect any previously selected function in that group including the factory default option for example if 26 is selected 20 25 and 27 are all deselected With the exception of functions 30 31 and 70 71 all extra functions are specific to a particular output and will only be changed for the output currently selected by the CONTROL keys the extra functions can therefore be set differently for each output Functions 30 31 buzzer and 70 71 Tracking apply to the whole instrument therefore changing the selection for output 1 will automatically change the selection on output 2 19 Code 10 11 20 21 22 23 24 25 26 27 30 31 40 41 42 50 51 60 61 62 70 71 90 91 99 Function Output always off at power up factory default Output status at power up same as at last power down LOGIC OUT closed for Output ON open for Output OFF factory default LOGIC OUT closed for Output OFF open for Output ON LOGIC OUT closed for any trip LOGIC OUT open for any trip LOGIC OUT closed for UNREG LOGIC OUT open for UNREG LOGIC OUT closed for Cl current limit LOGIC OUT open for CI curre
63. the present Limits value in the lower display the JOG indicator is positioned under the digit that was last jogged Whilst the V SET lamp is lit each further press will move the JOG indicator one digit to the left the selection wraps round such that when the largest value of jog increment has been reached the next press returns it to the lowest 13 The default position at power up is under the LSD i e the lowest jog increment is selected The jog steps that can be selected are 1mV 2mV for the 0 80V range 10mV and 100mV With jog enabled the output voltage can be incremented or decremented with the rotary jog control with a step resolution indicated by the position of the JOG indicator The output immediately follows the setting i e no OK is required In CV constant voltage mode the actual output voltage shown in the upper display line will follow the set voltage being Jogged in the lower display however if the output goes into constant current mode indicated by the CV status message being replaced by Cl the upper display showing actual voltage will show a value which is less than the set voltage Note that the dual display during JOG SET V is primarily of use if the output is ON with the output off both lines of the display show the Limits value and change simultaneously as the voltage is jogged Set Current Limit 14 With the output off the standard status display shows the set current limit with the ou
64. tial Operation chapter which should be read by new users When SET V is pressed the VOLTS display changes to show the present set value in a smaller font with the message Enter V or ESC below it and the OK lamp starts flashing The new voltage is then entered from the keyboard e g 12 345V is entered as 1 2 3 4 5 As itis entered it is displayed directly below the present setting replacing the prompt message The minimum voltage setting is 0 000V the maximum setting is 60 000V 0 60V range or 80 000V 0 80V range Pressing OK at any point will set the voltage entered with any remaining digits set to zero e g 1 2 3 OK will set 12 300V 1 OK will set 1 000V When OK is pressed the set voltage is changed and the display reverts to the standard status mode Pressing ESCAPE at any time during the sequence or making no further key press within 10 seconds of the previous one will cause the display to return to its original reading before SET V was pressed Entering a voltage outside the range maximum including trying to enter 3 digits before the decimal point or trying to enter more than 5 digits will cause the buzzer to beep the last key entry will be ignored The voltage can also be set using the Jog control Pressing JOG SET V will illuminate the V JOG SET lamp and the VOLTS display will again change to two lines With the output ON the top line continues to show the actual output but the additional lower display now shows
65. to be set in the Status Byte Register where lt n gt is 1 for output1 and 2 for output2 29 The Limit Event Status Register is read and cleared by the LSR lt n gt command The Limit Event Status Enable Register is set by the LSE lt n gt lt nrf gt command and read by the LSE lt n gt command Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Reserved for future use Set when a fault trip has occurred which requires AC power OFF ON to reset Set when an output sense trip has occurred Set when an output over current trip has occurred Set when an output over voltage trip has occurred Set when output enters power limit unregulated mode Set when output enters current limit constant current mode Set when output enters voltage limit constant voltage 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 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 B
66. 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 25 LAN Status Indication The LAN Status is displayed in the top left hand corner of the display during normal operation It is not shown on all menus There are 4 possible indications No LAN If the unit cannot detect any connection to a LAN e g the cable is unplugged then the LAN status indicator is Configuring The unit has detected a LAN connection but is not yet configured e g is waiting for DHCP The LAN status indicator is animated flashing between kh and Sm LAN OK The LAN connection is now configured and the unit can communicate The display becomes LAN FAULT The unit has detected a problem with LAN connection e g Its IP address is in use by another device Communication is not possible and the display shows I F Not Fitted For units without digital interfaces there is no ind
67. to the load increases until at about 24V the power limit is exceeded and the supply changes from CV to UNREG Output Power V x A If SHIFT V xA is pressed the display shows the product of measured output voltage x measured current inthe form nn n VA The V xA value is updated at the same measurement rate as for V and I Pressing ESCAPE cancels V x A mode Calculated Load Impedance V A If SHIFT V A is pressed the display shows the calculated result of measured output voltage measured current this is a sampled result which can be updated by further presses of the OK key Pressing ESCAPE cancels V A mode The display shows the calculated nominal V A value with a resolution of 5 significant digits 10uQ resolution for V A lt 1Q The accuracy is calculated from the uncertainty of the individual voltage and current measurements and is indicated by showing the minimum and maximum possible values in brackets beside the nominal The uncertainty is worst when either or both V and are small This function is extremely useful for measuring low impedances at high currents e g RDS on of power MOSFETs Always use the Remote Sensing function to eliminate the effects of connecting lead and contact resistance when making low value V A measurements Current Measurement Averaging Press SHIFT lave to select current averaging Iave shows in the top line of the display beside the mode status The AMPS reading is still updated at the same rat
68. tput on it shows the actual output current in all modes CV Cl or UNREG Both the actual current and the current limit are shown to a resolution of 10mA The current limit can be set directly from the numeric keypad press the NUMERIC SET key enter the new value using the numeric keys and confirm by pressing OK The broad principles of keypad entry are explained in the Initial Operation chapter which should be read by new users When SET is pressed the AMPS display changes to show the present current limit value in a smaller font with the message Enter I or ESC below it and the OK lamp starts flashing The new current limit is then entered from the keyboard e g 12 34A is entered as 1 2 3 4 As it is entered it is displayed directly below the present setting replacing the prompt message The minimum current setting is 0 01A the maximum setting is 50 00A i e there is no over range capability Pressing OK at any point will set the current entered with any remaining digits set to zero e g 1 2 3 OK will set 12 30A 1 OK will set 100A When OK is pressed the current limit is changed and the display reverts to the standard status mode Pressing ESCAPE at any time during the sequence or making no key press within 10 seconds of the previous one will cause the display to return to its original reading before SET was pressed Entering a value outside the range maximum including trying to enter 3 digits before the decimal p
69. tputs are operated in parallel to source higher currents than this the junction should be made at a separate point not one of the terminals Over Voltage Protection Over Voltage Protection OVP can be set from 2 0V to 90 0V If the output voltage exceeds the set OVP the output is immediately turned off typically within 100us thus avoiding damage to the circuit under test The OVP circuit will trip if an excessive voltage is accidentally set from the front panel or via a remote control interface or is the result of a failure in the control circuitry of the instrument itself OVP will also trip if an excessive voltage is impressed across the terminals from an external source however when the output is tripped off the external voltage will still be present and it is up to the user to remove the source to avoid possible damage To set OVP press SHIFT OVP The display changes to show only the present OVP setting together with the prompt Numeric Entry Range 2 90 the OK lamp flashes Enter the new OVP value using the numeric keypad exactly as described for setting output voltage and press OK to confirm the new setting to exit without entering a new value press ESCAPE The factory default setting is 90 0V If the OVP is tripped the display shows the message OVP Press ESC to Reset and the output is turned off Pressing ESCAPE at this point removes the message and the display now shows the preset voltage and current limit When the cause of t
70. uring 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 Performance B is stated 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 Minor deviations are possible at 300 350MHz 670 740MHz and 810 820MHz at 3V m 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 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 power supply is a Safety Class instrument according to IEC classification and has been designed to meet the requirements of EN61010 1 S
71. ut 1 The individual output enable buttons no longer work and the BOTH ON and BOTH OFF buttons must be used instead The display shows the individual figures for voltage and current on each output together with the sum of the two currents This mode is useful if the two outputs are wired in parallel to produce a high current output Note there is no connection between the two outputs internally Note that the output terminals are rated at 60A maximum if paralleling the outputs to source higher currents than this the junction should be made at a separate point not at one of the terminals 21 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 Fuse The correct fuse type is 15 Amp 250V HBC time lag 17 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 t
72. yboard The default status displays show the VOLTS 5 digits and AMPS 4 digits in 12mm high characters plus output range and status At other times for example during store or recall of instrument set ups the displays show up to 7 lines of information instructions or prompts INTERFACES QPX600DP only Full digital remote control facilities are available through the RS232 LAN USB and GPIB interfaces Setting and readback resolutions are the same as for the Output and Meter specifications respectively RS232 USB LAN GPIB Remote Command Processing Time GENERAL AC Input Power Consumption Operating Range Storage Range Environmental Store Recall Safety EMC Size Weight Options Standard 9 pin D connector Baud rate 9600 Standard USB 2 0 hardware connection Auto speed detect 10 100MHz Auto MDIX LXI V1 2 Class C compliant Conforms with IEEE488 1 and IEEE488 2 Typically lt 100ms between receiving the command terminator for a step voltage change at the instrument and the output voltage beginning to change 115V 240V AC 10 50 60Hz Installation Category Il 1600VA 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 Up to 10 set ups can be saved and recalled via the keyboard or remote interfaces Complies with EN61010 1 Complies with EN61326 130mm H 3U x 356mm W x 413mm D 9 2kg 19 inch ra
Download Pdf Manuals
Related Search