QPX1200 Instruction Manual (English) Iss 3
Contents
1. for Cl current limit LOGIC OUT open for CI current 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 LCD contrast adjustment Restores factory defaults including these settings Enter calibration mode Refer to Service Manual Factory Default Settings The ex factory Voltage Current Limit OVP OCP Output Settings RS232 default settings which will apply at first power up are as follows 0 000V 1 00A 65 0V 55 0A Output off local sense 10 20 30 40 50 60 active 9600 Baud 19 Remote Operation The instrument can be remotely controlled via its RS232 USB or Analogue interfaces USB remote control operates in a similar way to RS232 but via the USB connector Software supplied with the instrument sets up the controlling computer to treat the USB connection as a virtual COM port Application software on the computer can then access the instrument via that COM port 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 Baud R2. THURLBY THANDAR INSTRUMENTS QPX1200 pc Power SUPPLY INSTRUCTION MANUAL Table of Contents Specification EMC Safety Installation Connections Initial Operation Manual Operation Remote Operation Remote Commands Maintenance 11 13 20 24 26 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 OUTPUT SPECIFICATIONS Voltage Range Current Range Power Range Voltage Setting Current Setting Operating Mode 60V Volts 20V OV Output Switch Output Terminals Sensing Ripple amp Noise 20MHz bandwidth Load Regulation Line Regulation Transient Response OV to 60V 0 01A to 50A Up to 1200W Resolution 1mV Accuracy 0 1 of setting 2mV Resolution 10mA Accuracy 0 3 of setting 20mA 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 becomes unregulated CV Cl or UNREG mode indication in display QPX 1200 POWER ENVELOPE 20A Amps 50A Electronic with ON indication Preset voltage and current displayed when off Front panel safety terminals accepting 6mm wire diameter 6mm plugs or 8mm spades at
3. Electrostatic Discharge 4kV air 4kV contact Performance A b EN61000 4 3 1997 Electromagnetic Field 3V m 80 AM at 1kHz Performance B c EN61000 4 11 1994 Voltage Interrupt 1 cycle 100 Performance B d EN61000 4 4 1995 Fast Transient 1kV peak AC line 0 5kV peak DC Outputs Performance B e EN61000 4 5 1995 Surge 0 5kV line to line 1kV line to ground Performance B f EN61000 4 6 1996 Conducted RF 3V 80 AM at 1kHz AC line only DC Output connections lt 3m not tested Performance B According to EN61326 the definitions of performance criteria are Performance criterion A During test normal performance within the specification limits Performance criterion B During test temporary degradation or loss of function or performance which is self recovering Performance criterion C During test temporary degradation or loss of function or performance which requires operator intervention or system reset occurs Where Performance B is stated it is because DC Output regulation may deviate beyond Specification limits under the test conditions However the possible deviations are still small and unlikely to be a problem in practice Note that if operation in a high RF field is unavoidable it is good practice to connect the PSU to the target system using screened leads which have been passed together through an absorbing ferrite sleeve fitted close to the PSU terminals Cautions To
4. The jog steps that can be selected are 1mV 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 13 Set Current Limit With the output off the standard status display shows the set current limit with the output 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 chan
5. V and or 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 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 rear panel terminals The COMMON return signal is referenced to the positive 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 tim
6. 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 65 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 the 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 16 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 t
7. 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 Output Power V x A If SHIFT V xA is pressed the display shows the product of measured output voltage x measured current in the form nn n VA The V xA value is updated at the same measurement rate as for V and Pressing ESCAPE cancels V x A mode 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 rate 4 times per second but the value displayed is the rolling average of the last 4 current measurements made 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 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 2m connecting leads will drop 0 2V at 50 Amps for instance This problem can be minimised by using short thick conn
8. 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 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 forced cooling Connections Front Panel Connections 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 32 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 the front panel REMOTE SENSE lamp is lit when remote sense is selected Switching off remote sense returns the instrument to local sensing at the front panel output terminals L The terminal marked is connected to the chassis and safety earth ground Rear Panel Connections Output Terminals The output and sense terminals are duplicated on the rear panel these connections are paralleled with their front panel equivalents Remote sense op
9. 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 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 Logic 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
10. 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 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 17 The COMMON return signal is referenced to the positive 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
11. 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 Non isolated inputs and outputs to set voltage and current limit and to monitor actual output voltage and current These signals are referenced to the positive 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 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 DISPLAY FEATURES The display is a 240 x 64 pixel transflective LCD backlit by white LEDs contrast is software controlled and can be adjusted from the keyboard The default status display shows the VOLTS 5 digits and AMPS 4 d
12. will remain installed on the PC so that the establishment of a virtual COM port is done automatically each time the instrument is connected to the PC via USB in the future Further virtual COM ports are created for each additional instrument connected to the PC via USB Each instrument is assigned a separate virtual COM port when it is first connected and the same COM port will be assigned each time that instrument is subsequently connected the PC software makes use of the unique code embedded in each instrument to link it to the same virtual COM port irrespective of which physical USB port it is connected to 21 Status Reporting There are two status registers that can be interrogated via the RS232 or USB interfaces to establish the state of the instrument The Event Status Register contains information associated with a failure to properly implement a remote command and the Limit Status Register logs the entry to and or exit from current or voltage limit conditions plus any trip conditions that have occurred since the register was last read The response to both queries is a decimal number equal to the sum of the binary bits of the register Event Status Register The Event Status Register is read and cleared by the ESR command Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit O Power On Set when power is first applied to the instrument Not used Command Error Set when a syntax type error is detected in a
13. with the rear panel output connections 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 turned 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 15 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 The maximum permissible voltage between any terminal and earth ground h is 300VDC WARNING Such voltages are exceedingly hazardous and great care should be taken to shield the output terminals for such use On no account should the output terminals be touched when the unit is switched on under such use All connections to the terminals must be made with the power switched off on all units It should be noted that the unit can only 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 hig
14. 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 26 T T z Thurloby Thandar Instruments Ltd Glebe Road Huntingdon Cambridgeshire PE29 7DR England Telephone 44 0 1480 412451 Fax 44 0 1480 450409 e mail sales tti test com International website www tti test com UK website www tti co uk Book Part No 48511 1030 Issue 3
15. 50 Amps max or 4mm plugs at 30 Amps max Duplicate rear panel terminals Switchable between local and remote Screwless remote sense terminals on both front and rear panels 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 250us to within 100mV of set level for a 5 to 95 load change Output Protection Output will withstand an applied forward voltage of up to 70V Reverse protection by diode clamp for reverse currents up to 3A Over voltage Protection Range 2V to 65V Resolution 0 1V accuracy 0 2 0 2V OVP Response time typically 100s Over current Protection Range 2A to 55A Resolution 0 1A accuracy 0 5 0 2A OCP Response time typically 100ms Over temperature Protection The output will be tripped off if a fault causes the internal temperature to rise excessively Temperature Coefficient Typically lt 100ppm C METER SPECIFICATIONS Display Type 5 digit Volts 4 digit Amps black on white backlit LCD Voltage CI Mode and Unreg Resolution 1mV Accuracy 0 1 of reading 2 digits Current CV Mode amp Unreg Resolution 10mA Accuracy 0 3 of reading 2 digits VxA Resolution 0 1W Accuracy 0 5 0 1W LOGIC CONTROL INPUT and OUTPUT LOGIC IN is a
16. F 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 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 and Vista 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
17. akeshift 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 Installation Mains Operating Voltage This instrument has a universal input range and will operate from a nominal 115V or 230V mains supply without adjustment Check that the local supply meets the AC Input requirement given in the Specification Mains Lead Connect the instrument to the AC supply using the mains lead provided Should a mains plug be required for a different mains outlet socket a suitably rated and approved mains lead set should be used which is fitted with the required wall plug and an IEC60320 C13 connector for the instrument end To determine the minimum current rating of the lead set for the intended AC supply refer to the power rating information on the equipment or in the Specification WARNING THIS INSTRUMENT MUST BE EARTHED Any interruption of the mains earth conductor inside or outside the instrument will make the instrument dangerous Intentional interruption is prohibited 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
18. apter which describes the operating principles of the keypad and rotary jog control Set Voltage With the output off the standard status display shows the set voltage Limits shows as a reminder beside OUTPUT 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 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 Initial 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 it is entered it is displayed directly below the present setting replacing the prompt m
19. ate Selection Press SHIFT BUS to display the list of bus types Analogue Control RS232 USB or None The present bus selection is indicated with a v The bus type can be changed directly by keying in the number 0 to 3 beside the bus in the list or by scrolling to the appropriate bus in the list using the JOG SET control the selected bus is indicated by the square brackets at that position in the list Press OK to activate the selected bus At any time before the OK key is pressed the selection can be exited without change by pressing ESCAPE or by waiting for the operation to time out If None USB or Analogue Control have been selected as the bus type pressing OK returns the display to the standard status screen If RS232 has been selected pressing OK changes the display to the Baud rate screen showing the current Baud rate and the message Set Baud with JOG To change the Baud rate scroll through the available rates using the JOG control until the required setting is displayed Press OK to select and return to the standard status screen Remote Local Operation 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
20. ated supply voltages or environmental range WARNING THIS INSTRUMENT MUST BE EARTHED Any interruption of the mains earth conductor inside or outside the instrument will make the instrument dangerous Intentional interruption is prohibited The protective action must not be negated by the use of an extension cord without a protective conductor When the instrument is connected to its supply terminals may be live and opening the covers or removal of parts except those to which access can be gained by hand is likely to expose live parts The apparatus shall be disconnected from all voltage sources before it is opened for any adjustment replacement maintenance or repair Capacitors inside the power supply may still be charged even if the power supply has been disconnected from all voltage sources but will be safely discharged about 10 minutes after switching off power Any adjustment maintenance and repair of the opened instrument under voltage shall be avoided as far as possible and if inevitable shall be carried out only by a skilled person who is aware of the hazard involved If the instrument is clearly defective has been subject to mechanical 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 m
21. can be read via the remote interfaces in the same manner as the status registers The Execution Error Register is read and cleared by the EER command 0 No error encountered 1 9 Indicates a hardware error has been encountered 100 The numerical value sent with 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 A recall of set up data has been requested but the store specified does not contain any data Power on Settings The following instrument status values are set at power on Event Status Register 128 power on bit set Execution Error Register 0 0 then immediately set to show new limit status Limit Status Register 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 23 Remote Commands Remote Command Format RS232 input to the instrument is buffered in a 256 byte input queue which is filled under interrupt in a manner transparent to all other instrument operations The instr
22. command from the bus The parser is reset and parsing continues at the next byte in the input stream 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 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 Not used Not used Not used Limit Status Register 22 The purpose of this register is to inform the controller of entry to and or exit from current or voltage limit conditions and the history of trip conditions since the last read clear The Limit Status Register is read and cleared by the LSR1 command Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit O 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 Error Messages Each error message has a number Error message numbers are not displayed but are placed in the Execution Error Register where they
23. e 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 The following nomenclature is used lt rmt gt lt RESPONSE MESSAGE TERMINATOR gt lt nrf 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 of the command lt nr1 gt A number with no fractional part i e an integer lt nr2 gt A number in fixed point format e g 11 52 0 78 etc 24 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 operation is completed at the end of the timeout period and Bit 3 of the Event Status Register is set see Status Reporting section for details V1 lt nrf gt V1V lt nrf gt OVP 1 lt nrf gt 11 lt nrf gt OCP1 lt nrf gt DAMPING1 lt nrf gt V1 11 OVP1 OCP1 V10 110 DELTAV1 lt nrf gt DELTAI1 lt nrf gt DELTAV1 DELTAI1 INCV1 INCV1V DECV1 DECV1V INCI1 DECI1 OP1 lt nrf gt OPALL lt nrf gt SENSE1 lt
24. e has been to make changing settings as safe as possible i e with minimal risk of accidentally applying excessive voltages to a target system 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 Under normal conditions the numeric keypad is disabled pressing any key will cause the buzzer to beep indicating an illegal operation 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 to 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 w
25. e 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 store 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 18 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 acc
26. ecting 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 spring loaded REMOTE SENSE terminals and connect directly to the load 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 the REMOTE SENSE lamp above the front panel terminals lights 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 REMOTE SENSE lamp above the front panel terminals is 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 The power supply has rear panel output and sense terminals appropriate for when the instrument is used in a rack The rear panel remote sense terminals should always be used
27. eneral 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 Output always off OUTPUT OFF is shown in the display However the user can change this default setting such that the Output is also restored at power up to its status at power down see the Extra Functions section The DC Output is switched on and off electronically with alternate presses of the key the ON lamp illuminates when the Output is on At the same time the message above the VOLTS and AMPS display changes from OUTPUT 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 Keypad Only the principles of operation are outlined here the setting of individual parameters is given in detail in later sections The paramount consideration in designing the user interfac
28. 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 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use It is an Installation Category II instrument intended for operation from a normal single phase supply This instrument has been tested in accordance with EN61010 1 and has been supplied in a safe condition This instruction manual contains some information and warnings which have to be followed by the user to ensure safe operation and to retain the instrument in a safe condition This instrument has been designed for indoor use in a Pollution Degree 2 environment in the temperature range 5 C to 40 C 20 80 RH non condensing It may occasionally be subjected to temperatures between 5 C and 10 C without degradation of its safety Do not operate while condensation is present Use of this instrument in a manner not specified by these instructions may impair the safety protection provided Do not operate the instrument outside its r
29. eration is selected from the keyboard or via a remote control interface When the rear panel terminals are used remote sense should always be selected to ensure that output regulation is maintained within specification Logic Input 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 AN 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 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 operating 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 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 retu
30. essage The minimum voltage setting is 0 O00V the maximum setting is 60 000V 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 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 The default position at power up is under the LSD i e the lowest jog increment is selected
31. essed 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 exited 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 Code 10 11 20 21 22 23 24 25 26 27 30 31 40 41 42 50 51 60 61 62 90 91 99 for example if 26 is selected 20 25 and 27 are all deselected 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
32. ges 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 point 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 t
33. he 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 will 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 14 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
34. her 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 outputs are operated in parallel to source higher currents than this the junction should be made at a separate point not one of the terminals Over Voltage Protection Over Voltage Protection OVP can be set from 2 0V to 65 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 65
35. igits in 10mm high characters plus the present output mode At other times for example during store or recall of instrument set ups the display shows up to 6 lines of information instructions or prompts INTERFACES Full digital remote control facilities are available through the RS232 and USB interfaces Setting and readback resolutions are the same as the Output and Meter specifications respectively RS232 USB Remote Command Processing Time GENERAL AC Input Power Consumption Operating Range Storage Range Environmental Store Recall Safety EMC Size Weight Options Variable Baud rate 19200 Baud maximum 9 pin D connector Standard USB 2 0 hardware connection Typically lt 100ms between receiving the command terminator for a step voltage change at the instrument and the output voltage beginning to change 110V 240V AC 10 50 60Hz Installation Category II 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 rack kit EC Declaration of Conformity We Thurlby Thandar Instruments Ltd Glebe Road Huntingdon Cambridgeshire PE29 7DR England declare that the QPX1200 Power Supply with RS232 amp USB interfaces meets the inten
36. ill 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 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 before reverting to the standard status display The standard status display shows the 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 OUTPUT OFF CV CI or UNREG if the output is off then Limits is also shown in the display above the V and values 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 Manual Operation New users should first read the Initial Operation ch
37. ithin 10 seconds 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 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 11 Jog Control The rotary jog control permits the output voltage or current limit to be incremented 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 At power up jog is alway
38. nrf gt SAV1 lt nrf gt RCL1 lt nrf gt Set the output to lt nrf gt Volts Set the output to lt nrf gt Volts with verify Set the output over voltage protection trip point to lt nrf gt Volts Set the output current limit to lt nrf gt Amps Set the output over current protection trip point to lt nrf gt Amps Set the current meter measurement averaging lave where lt nrf gt has the following meaning 0O OFF 1 ON Return the set voltage response is V1 lt nr2 gt lt rmt gt where lt nr2 gt is in Volts Return the set current limit response is 11 lt nr2 gt lt rmt gt where lt nr2 gt is in Amps Return the voltage trip setting response is VP1 lt nr2 gt lt rmt gt where lt nr2 gt is in Volts Return the current trip setting response is IP1 lt nr2 gt lt rmt gt where lt nr2 gt is in Amps Return the output readback voltage response is lt nr2 gt V lt rmt gt where lt nr2 gt is in Volts Return the output readback current response is lt nr2 gt A lt rmt gt where lt nr2 gt is in Amps Set the output voltage step size to lt nrf gt Volts Set the output current step size to lt nrf gt Amps Return the output voltage step size response is DELTAV1 lt nr2 gt lt rmt gt where lt nr2 gt is in Volts Return the output current step size response is DELTAI1 lt nr2 gt lt rmt gt where lt nr2 gt is in Amps Increment the output voltage by step size Increment the
39. o 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 below 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 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 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
40. output voltage by step size with verify Decrement the output voltage by step size Decrement output voltage by step size with verify Increment the output current limit by step size Decrement the output current limit by step size Set output on off where lt nrf gt has the following meaning O OFF 1 ON Set all outputs on off where lt nrf gt has the following meaning O OFF 1 ON In this instrument it has the same action as OP1 lt nrf gt Set output sense mode where lt nrf gt has the following meaning O local 1 remote Save the current PSU set up to the set up store specified by lt nrf gt where lt nrf gt can be 0 9 Recall a set up for the PSU from the set up store specified by lt nrf gt where lt nrf gt can be 0 9 25 System and Status Commands RST TRIPRST LOCAL EER ESR LSR1 Resets the instrument to the factory default settings with the exception of all remote interface settings See Factory Default Settings section Attempt to clear all trip conditions Go to local 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 Event Status Register The response format is lt nr1 gt lt rmt gt See Status Reporting section for details of the response Query and clear the Limit Status Register The response format is lt nr1 gt lt rmt gt See Status Reporting section for de
41. rn signal is referenced to the positive output of the power supply AN Do not apply external voltages between the terminals exceeding 20VDC Analogue Monitor The output terminal 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 positive output of the power supply A N Do not apply external voltages to these terminals RS232 USB 10 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 RI TXD RXD CTS GND RTS DSR DTR CD CON DOOR WD gt Description Passively asserted V through 10kQ Transmitted data from instrument Received data to instrument Signal ground Passively asserted V through 10kQ No internal connection No internal connection Signal ground is connected to instrument ground 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 Initial Operation This section of the manual is a g
42. s 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 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 w
43. t 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 1998 Radiated Class A b EN61326 1998 Conducted Class A c EN61326 1998 Harmonics referring to EN61000 3 2 2000 Immunity EN61326 1998 Immunity Table 1 Performance B referring to a EN61000 4 2 1995 Electrostatic Discharge b EN61000 4 3 1997 Electromagnetic Field c EN61000 4 11 1994 Voltage Interrupt d EN61000 4 4 1995 Fast Transient e EN61000 4 5 1995 Surge f EN61000 4 6 1996 Conducted RF Safety EN61010 1 Installation Category II Pollution Degree 2 Chris wilki CHRIS WILDING TECHNICAL DIRECTOR 2 March 2007 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 1998 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 2000 Class A the instrument is Class A by product category Immunity EN61326 1998 EMC product standard for Electrical Equipment for Measurement Control and Laboratory Use Test methods limits and performance achieved were a EN61000 4 2 1995
44. tails of the response Miscellaneous Commands IDN TST TRG 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 type of instrument 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 Calibration Specific Commands See Service Manual for details of calibration specific commands Note The use of 1 in many of the commands e g V1 lt nrf gt 1107 is to keep the commands entirely compatible with those for multi output TTi programmable power supplies 1 refers to Output 1 which for this power supply is the only output a dual output supply for example would have a duplicate set of commands V2 lt nrf gt 1207 etc Maintenance The Manufacturers or their agents overseas will provide a repair service for any unit developing a fault Where owners wish to undertake their own maintenance work this should only be done by skilled personnel in conjunction with the service manual which may be purchased directly from the Manufacturers or their agents overseas Cleaning If the instrument requires cleaning use a cloth that is only lightly dampened
45. 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 RS232 Interface Connector 20 The 9 way D type serial interface connector is located on the instrument rear panel The pin connections are as shown below Pin Name Description 1 RI Passively asserted V through 10kQ 2 TXD Transmitted data from instrument 3 RXD Received data to instrument 4 CTS 5 GND Signal ground 6 RTS Passively asserted V through 10kQ 7 DSR No internal connection 8 DTR 9 CD No internal connection RS232 Connections The RS232 interface should be connected to a standard PC port using a fully wired 1 1 male female cable without any cross over connections Alternatively only pins 2 3 and 5 need be connected to the PC but with links made in the connector at the PC end between pins 1 4 and 6 and between pins 7 and 8 see diagram PC ae INSTRUMENT ymin gt DCD 1OQ O1 RX lt 0 O x 304A _ O3 DTR 40 O4 GND 5 O O55 DSR t 6O O6 RTS 7 O O7 he aC LINKS TO O8 Ri t 90 NULL OUT PC O 9 Baud Rate is set as described above in Bus and Baud Rate Selection the other parameters are fixed as follows Start Bits 1 Parity None Data Bits 8 Stop Bits 1 RS232 Character Set Because of the need for XON XOF
46. ument 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 Command List This section lists all commands and queries implemented in this instrument The commands are listed in alphabetical order within th
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