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1. zalil B H d H HI z He Li URA Li Tran N TI m List sp B B H H A a c F a Li A Sense am D O G w d alalalala u E im JA OA AA URA LG Tran HTHP URN NA ELL Al Ga Sense 3 4 load module VFD panel L R is the indicator of dual channel module s left right channel if you want to edit left right channel parameters first select the cannel L is the left channel R is the right channel Single channel module will always display L OFF indicates that the module input is off when enable the module input OFF will turn off CC CV CR CW CZ are module s 5 work modes VFD display screen has 4 lines of number show the first line shows the current actual voltage value the second line shows the actual current value the third line shows the actual circuit s power value the forth line shows the setup value users can set A V O value Short is lit up when the module enables short circuit function TRAN is lit up when the module enables transient mode LIST is lit up when select the LIST mode at the configuration SENSE is enabled in rem
2. CONST VOLTAGE Load works in CV mode JCONSTRESISTANCE Load works in CR mode 25 RANGE CC CR Switch the range LOWRANGE O JcCONTNUOUS Continuous mode USE pPusemode O Vmax 82 000V Vmin 0 000V Setup menu list of IT8732B IT8733 1T8733B IT8731 1T8732 CC CV RANGE HIGHRANGE LOWRANGE oo 7 I R W SET 2 500A uS 2 500A uS RAN A 0 00A a 0 0005S RAN B 0 00A b 0 0005S T MODE TOGGLE Toggemode Setup menu list of IT8722 module SET UP MODE Select working mode 26 CONSTCURREN Load works in CC mode CONSTVOLTAGE Load works in CV mode CONSTRESISTANCE Loadworksin CR mode CONSTPOWER Load works in CW mode ICONSTIMPEDAN Load works in CZ mode RI SS HIGH RANGE LOWRANGE jp JCONTNUOSS Continuousmode o Puse pulemode O o TOGGLE Togglemode Configuration menu Press MD Y key to enter the channel configuration menu Configure menu list of IT8711 1T8712 module MEN ON DEFAULT Turn on synchronization function jr 3X v Turnoffsynchronization function MN po VONPOINT Settheload svonpoint VONLATCH Von pointlatch state ON OFF ei VRANGE SEL JHeHVRANGE High
3. ONTIMERSET Setup Load ON timer time Eq AA FUNCTION MODE SelectMode_________________ FIXED Choose fixed operation mode JUST Choose list operation mode RECALLLIST Recalllistoperationfie EDTLST peditlistoperationfile HIGH RANGE n CC mode Edit high range oflist ON Enable the function in CR mode press setup to set Vd level OFF Disable this function N Turn on external analog control function OFF DEFAULT Turn off external analog control function en JEnable remote sense function JOFF DEFAULT Disable remote sense function ABOUT IE SO A A a SN 2000000000000 Channel production serial number VER 120 Ghannelsoftwareversion 0 0 em ES Configure menu list of IT8722 module Setup Synchronization ON OFF function 29 ON DEFAULT Turn on synchronization function JOFF X Turnoffsynchronization function NONPONT Set the load s von point MONLATCH Von point latch state ON JOFF EXT AAA COUNT Average count set 21 2 16 X JON DEFAULT Enablethisfunction__________ jrr pisablethisfuncion MAXPOWERSET Setup hardware power protecting JALIMITSTATE Setup software current protecting state ON Put OFF DEFAULT Putoff 0 0
4. JRECALLLIST RRecallistoperationfile EDTLST Editlistoperationfile ojee UST InCC mode Edit list testing file v usr InCVmode Editlisttestingfile Jen UST nCRmode Fditlisttestingfile N jJTurnonexternalanalogcontrol function OFF DEFAULT Turnoffexternalanalog control function ABOUT Module production information jm8zxX Channel production model SN XXXXXXXXXXXXX Channel production serial number VER 120 Channel software version EXT go oo vv Configure menu list of IT8732B 1T18733 1T8733B 118731 1T8732module Setup Synchronization ON OFF function JON DEFAULT Turn on synchronization function OFF Turn off synchronization function MON 28 VON POINT Set the load s von point VONLATCH Von point latch state ON OFF oo MV v p co AVERAGE Cour Average count set 2 2 16 V AUTORAGE Auto switching voltage range JON lt DEFAULT gt Enable this function Disable this function PROTECT Load protecting function MAX POWER SET Setup hardware power protecting ALIMIT STATE Setup software current protecting state OFF DEFAULT Putoff PLIMITPOINT__ Setup software power protecting value PLIMITDELAY Setup software power protecting delay ONTIMERSTATE Setup Load ON timer state
5. Procedure Steps VFD display 1 power on the E load 2 select the channel 3 Press Git O enter COFIG menu of the specified channel 4 Press ED to move to CR LED press Ente to enable ON OFF Default the function then prees 5 Press ESC to escape 6 Press Setup MODE CC 7 Press GB selct the working mode as CR by pressing Const Current A Const Voltage direction key up and down key press sonst Ba e 8 Press down arrow key until the VFD display gt Rset 7500 0 Const Resis SYNC ON SET and then set the CR resistance level 9etz 500 0 Enter Esc 9 Press down arrow key to gt Vd 0 000V press Gi to set the CR LED Vdorp Vd value 0 000V Enter ESC 10 Press ESC to escape 64 Chapter7 Remote operation There are four kinds of communication interfaces Ether Net GPIB USB RS232 You can choose any one of them to communicate with PC II LL NI 11 Figure 7 1118700 rear panel communication interface e Ether Net interface use a network cable to connect PC through Ether net interface of load Then press Gi sen the front panel to enter menu choose lt Ether net gt in lt communication gt item then set gateway address lt Gateway Set gt IP address IP Set gt mask address Mask set and port lt port set in Ether net e GPIB interface First conncet GPIB port of load to GPIB card of PC They must be sufficient contact and tighten the screws And then set address The addre
6. Me ope 0 0001 0 25A US 0 001 2 5AUS 0 0001 2 5A S 0 001 2 5A uS Measuring range 0 18V 0 80V 0 18V 0 80V Readback Resolution 1m oim 1m voltage accuracy 0 025740 025 0 V 025 F 0 nias 025 FS 0 kali 025 FS pee accuracy 0 05 0 05 FS 0 05 0 05 FS aa Protection range 400W OCP OVP 82V OTP 850 Specification Current 4 4 4A 14 40 A 6 6 6A 66 60A CC voltage CV resistance 300KA 300KA 82 183 573 82 183 573 A oer Model IT8733B Input Input 0740 C input power 500 W Min EE CV mode 0 05 0 025 FS range 0 30A CC mode 0 05 0 05 FS 0 05 0 05 FS Sa nedo 16bit Rated value 10mW 0 40 C 0 2 0 2 FS Dynamic mode CC mode Dynamic T1 amp T2 20uUS 3600S Res 1uS mode 5uS 100ppm CIDO Lali 0 0001 0 1A uS 0 001 1A uS g slope Measuring range am bac net 0 025 0 025 FS nas 0 05 0 05 FS eo power 0 2 0 2 FS Protection range 500W OCP 3 3A OVP 510V OTP 85 C Specification current s m CC 3 3 3A 33 30A voltage resistance CR 150m0 150m0 So Um IMO 82 183 573mm 5KG safety CE 118722 Channel 1 Channel 2 Input 0 80V 0 80V voltage Input 0 40 C 250 W 250W Min 0 15V at 3A 1V at 20A 0 15V at 3A 1V at 20A voltage 0 18V 0 80V 0 18V 0 80V CV mode accuracy 4095 z PF 0 05 0 025 FS 0 05 0 02 FS CC mode 0
7. e mers tup Load ON timer time EXT OO A LIST Choose list operation mode RECALL LIST EDIT LIST HIGH RANGE In CC mode Edit high range of list LOWRANGE In CV mode Edit low range of list ON Enable the function in CR mode press setup to set Vd level EXT CTR 1 SET ON Turn on external analog control function ON Enableremotesensefunction JOFF lt DEFAULT gt Disable remote sense function IT87XX Channel production model SN XXXXXXXXXXXXX Channel production serial number VER 1 20 Channel software version LIST O J FX ITI U System menu Press Sid Y key to enter system menu function INITIALIZE INITIAL DEFAULT SET Resume all configuration to default OWER ON SET Set the load s input state to be the default state when power on SAVO Set the load s input state to be that of SAVE O set when power on Setup the buzzer state enable the function OFF lt DEFAULT gt disable the function Module knob mode setting UPDATE lt DEFAULT gt Real time Update RST DEFAULT BUZZER SET OADON KNOB OLD lt S Cec OB _ a Q eta D s gt o 5 O c monet O TI TI 0 C 3 o euim gt o O S e 5 m RIGGER SOUR Setup the trigger mode MANUAL DEF anual trigger EXTERNAL xternal signal trigger mode HOLD rig IMM available PIB bus trigger mode imer trigger TIMER TIGGER TIMER Trigger time
8. 2 0 2 FS 0 2 0 2 FS Dynamic mode Dynamic T1 amp T2 20058 36006 Res 1u S 20uS 3600S Res 1u S mode 5uS 100ppm 5uS 100ppm Me ope O 00OT 0 5A US 0 001 tA us 0 0001 0 25A uS 0 001 2 5A uS Measuring range 18 0 18V 0 500V 0 18V 0 80V Readback mv voltage o o o o O 0 025 zu 025 F 0 ag A ts 00 eo O25 F Readback range 0 uk TI 0 20A 0 12A 0 TT ea ac current 0 01mA 0 05 0 05 FS 0 05 0 1 FS 0 1 0 1 FS jeg accuracy 0 2 0 2 FS Protection range OPP 300W 600W OCP 3 3A 13 2A OVP 82V 82V OTP 85 C 85 C Specification current CC 3 3 3A 22 20A 13 2 12A 132 120A voltage er ow oe 200m0 200m0 15m0 15m0 CR Input z 300K0 82 183 573mm 82 183 573mm weight 5KG KS Model IT8731 IT8732 voltage Input 0 40 C 200 W 400W Min operation 0 10V at 4A 1V at 40A 0 15V at 6A 1 5V at 60A voltage 0 18V 0 80V 0 18V 0 80V ksi mv tom mW One xa se Ee IAS OS ra des HOG OOF 0 05 0 02 FS 0 05 0 025 FS 0 404 1mA 60A 0 05 e 05 FS 0 05 0 05 FS 0 05 0 05 FS 0 05 Yo 0 05 FS Rod TET 100 100 7 5KQ 0 050100 100 7 5KQ 0 01 0 08S 0 01 0 0008S 0 01 0 08S 0 019640 0008S OW R l range 200W 400W qq 10mW 0 2 0 2 FS 0 2 0 2 FS Dynamic mode T1 amp T2 20uS 3600S Res 1u S 20u5 36005 Res 1u S 5U5 100ppm 5U5 100ppm
9. 20A 0 20A Resolution 21 0 05 0 025 FS accuracy AR sa E PF 0 05 0 05 FS 0 05 0 05 Fs 0 05 0 05 FS e 100 7 5KO 0 050 100 100 7 5KO Resolution 16bit 16bit 0 01 0 08S 0 01 0 0008S 0 01 0 08S 0 01 0 0008S 250 250 Rated value current Dynamic mode Dynsimlo mode eni 0 0001 0 2A uS 0 001 2A uS 0 0001 0 2A uS 0 001 2A uS Measuring range 0 18V 0 80V 0 18V 0 80V Readback Resolution L Gim L Gim io AM io AM oim oim 1mV 1mV voltage 0 025 0 025 0 ma 02590FS 0 Md s 025 F 0 T 025 F accuracy FS Readback 299 UE TEST eadbac 7 current Resolution 0 01mA 0 01mA 0 05 0 05 FS 0 05 0 05 FS m 100W 250W 0 2 0 2 FS 0 2 0 2 FS Protection range OPP OW OW OCP OVP OTP Specification 82 1 ee 4 2 Supplementary characteristics Storage capacity 101 sets Suggested calibration frequency one time each year AC input grade 22 Option Opt 1 220V 10 50Hz 60Hz Option Opt 2 110V 10 50Hz 60Hz Cooling style fans Fans control temperature The first grade The second grade The third grade Operation environment temperature O to 40 C Storage temperature 20 to 70 C Using conditions Designed for indoor use the maxmum humidity 8096 Chapter5 Panel function introduction Introduction This chapter mainly introduces the functions and operations of front panel keys It mai
10. P JILLIL CIL IL EN 10 16 Pa C SR SHE MAD UU pM SM eee EE MAA HE LN S ME ME Bd jj O gna j o O panny j O i JP Lr TANIA L o EBA A EM As ALO Jui al S SUE INUKU 3L SUE o 1 dr 8 booa ei ella 5000 f 95999 SIl e IIIS IT8702 E i A I Figure 5 8 Expand connections 5 6 Controlling link There is a 8 pin connector on every module s rear panel the following will introduce in detail the 8 pins specific functions ro EE jo d Magnified Connector Fig 5 9 terminals on single channel module rear panel 3 DI Digital input terminal 4 DO Digital output terminal 3 4 O OUT Current monitoring output 5 SENSE Voltage remote measuring terminal 6 SENSE Voltage remote measuring Hu terminal External vana controlling terminal IN External na controlling terminal 5 6 1 Voltage failure indication When the load is under OVP or reverse protection condition pin 2 VF will output high level signal 5 6 2 Current monitoring Current monitoring terminal will output 0 10V analog signal to accordingly on behalf of 0 full range of input current You can connect an external voltmeter or a oscilloscope to display the input current s changing 5 6 3 Digital 1 O Digital O is the pin 3 and pin 4 shown in figure 3 14 2 only used in remote control Pin 4 digital output terminal can output T
11. Single teminal connection is adequate when the input current is less than 30A WARNING To prevent shock hazard you must install the teminal cover correctly after wiring Each teminal can carry up to 30A current double teminal connection is needed when the input current if more than 30A double terminal connection refer to the above picture 5 8 Parallel connections Parallel connection can be applied between same model modules to increase current and power dissipation but it can t be applied between different modules Modules can be paralleled in CC CR mode but can t be in CV mode Each module will dissipate the power it has been programmed for For example after being paralleled two single channel modules 80V 40A 300W can dissipate up to 80V 80A 600W The following picture 5 12 illustrates the paralleled connection for increased power dissipation 41 fig 5 12 module parallel connection Chapter6 Operations introdution This chapter will mainly introduce IT8700 s menu operation function 6 1 Local remote operation The front panel has keyboard controls for setting voltage current resistance Local operation means control the electronic load via the keys on the front panel and the menu operation Remote operation means control the electronic load 0 computer via the GPIB RS232 USB or Ether Net interface You can press Cshift between remote control and local control key to switch 6 2 PC control connection 118
12. a 10 bit word with one start bit and one stop bit The number ofstart and stop bits is not programmable However the following parity options are selectable using the frongt panel lt Shift gt lt System gt kye Parity options are stored in non volatile memory Baud rate The front panel Shift lt System gt key lets you select one of the following baud rates which is stored in non volatile memory 4800 9600 19200 38400 57600 115200 RS 232 flow control The RS 232 interface supports the following flow control options that are selected using the front panel Shift 4 lt System gt key For each case the electronic load will send a maximum of five characters after hold off is asserted by the controller The electronic load is capable of receiving as many as fifteen additional characters after it asserts hold off The electronic load asserts its Request to Send RTS line to signal hold off when its input buffer is almost full and it interprets its Clear to Send CTS line as a hold off signal from the controller When the input queue of the electronic load becomes more than 3 4full the instrument issues an X OFFcommand The control program should respond to this and stop sending characters until the electronic load issues the X ON which it will do once its input buffer has dropped below half full The electronic load recognizes X ON and X OFF sent from the controller An X OFF will cause the electronic load to stop outputting
13. as channel 1 3 Press Setup key to enter the channel setup menu press Enter key to enter the mode selection menu Mode press key to select the mode CC CV CR CW CZ such as CC press key to confirm 4 Press key to enter range selection menu Range press Enter key to enter the mode selection menu Mode press key to select such as low range press key to confirm CC CR mode have two ranges to all the modules 5 Press key to enter the current setting lt lset gt such as set the current to be 1 25A press key to confirm 6 Press CED key to enter the rise slope setting lt f gt such as set the rise slope to be 1A uS Press key to confirm Press GI key to enter the fall slope setting lt gt such as set the fall slope to be 2A uS Press key to confirm 8 Press Es key to exit 9 Press CHA to open the load s input 6 4 Transient operation VFD display CH01 CC OFF Vdc 0 0000V Adc 0 0000A Wdc 0 00W CH01 Mode CC RANGE HIGH Iset 9 000A CHO1 HIGH RANGE LOW RANGE CH01 Const Current Set 1 25A CH01 Rise Speed Set 1 00A Us CH01 Fall Speed Set 2 00A Us CH1 CC ON Transient operation enables the module to periodically switch between two load levels as might be required for testing power supplies Transient operation can be turned on and off at the front panel and should set the parameters associated with transient operation keys before you turn on the operati
14. characters until it sees an X ON NONE There s no flow control Flow control options are stored in non volatile memory RS 232 connections The RS 232 serial port can be connected to the serial port of a controller i e personal computer using a straight through RS 232 cable terminated with DB 9 connectiors Do not use a null modem cable Table 2 2 shows the pinout for the connector If your computer uses a DB 25connector for the RS 232interface you will need a cable or adapter with a DB 25 connector on one end and a DB 9 connector on the other wired straight through not null modem 66 RS 232 connector pinout pin number description no connection TXD transmit data RXD receive data no connection 7 RS 232 troubleshooting If you are having trouble communicating over the RS 232 interface check the following The computer and the electronic load must be configured for the same baud rate parity number of data bits and flow control options Note that the eledtronic load is configured for 1 start bit and 1stop bit these values are fixed The correct interface cables or adapters must be used as described under RS 232 connector Note that even if the cable has the proper connectors for your system the internal wiring may be incorrect Theinterface cable must be connected to the correct serial port on your computer COM1 COMO etc Communication setting Before communication operation please make
15. edit then edit every group s E pe we select channel 3 and channel 5 in above press keys to switch channels after selecting channel 3 17 Press SD Koy gt MODE CC RANGE HIGH SET 1 00 A 18 You can edit every step s mode gt MODE CC press ited fp UM key to enter the menu press key to select mega CONST VOLTAGE for example select gt Const Current press EMED to confirm CONST RESIS Press to select range for example RANGE HIGH press to enter the menu 19 Press GD key move the cursor to gt SET 1 00 A CONST CURRENT 62 press Ente to enter the menu set the working current for SET 1 000A example set 1A press numeric key then press Enter to confirm 20 Press GED to move the cursor to VMAX 82 000V you VOLTAGE Upper need to set the highlimit of testing voltage press ED to enter LIMIT 9 800V the menu In this example the first step is 5 8V press e 8 keys then press Enter key to confirm 21 Press YD key to move the cursor to VMIN 0 000V you VOLTAGE LOWER need to set the low limit of testing voltage press key to LIMIT 0 150V enter the menu In this example the first step is 0 15V press o O i keys then press Enter key to confirm After edited the first step of channel 3 press key to exit 22 Press Ge keys to select channel 5 in order to select the first step of channel 5 repeat 16 19 steps after editing the menu press key to exit 23 Then save t
16. module panel Dual channel module means a module have two channels Each channel is isolated with the other setting of the module keyboard can control two channels The left cannel is channel L the right channel is channel R bd IT8711 Electronic load 0 80V 30A 150W 0 80 V 40A 250W Fig 3 3 dual channel module front panel 856 1 Modules panel view highlight VFD which display the working state upper display voltage and current information for channel L lower displays information for channel R Modules panel keyboard Beton eerie owitch the left right channels Press ER and O to control the two channels Realize short testing allows the load to simulate a short circuit at the input Switch work mode ED Move the cursor position Press key to move the cursor to the position you want to edit and then use the rotary knob to adjust Select the transient mode press key first to enable transient mode before running A B transient program and then send trigger signal to run the program ad Control module s input state on off 34 LN Rotary knob used to change the setting parameter values 3 Module s air inlet 5 3 VFD indicator function description The detailed introduction of VFD s all indicator functions are as bellow Short lt 0 co s
17. start discharge voltage and the terminal discharge voltage of the power supply 94 LOAD SINE CURRENT s RISE RATE Fall Rate Aj uS Fig 6 10 VON LATCH load s working range When disable Von LATCH voltage rise and is higher than the Von loading voltage input of electronic load is turned on When the power supply s voltage fall and is lower than Von unload value input is turned off LOAD SINK CURRENT pos RISE RATE Af uS t Fig 6 11 VON LATCH load s working range When enable Von LATCH voltage rise and is higher than the Von loading voltage input of electronic load is turned on When the power supply s voltage fall and is lower than Von unload value input won t be turned off 99 Von function panel operations Operations 1 Power on the electronic load 2 Select a channel such as channel 1 3 Press EDRO to enter configuration menu 4 Press GBD select lt Von gt press Ente to enter First set lt Von point gt press m to enter input the programmed value such as 1V press key to confirm 5 Press to select Von Latch gt press Enter key to enter select on off state such as On press key to confirm 6 Press key to exit 7 Open the load s input When in remote control mode USB RS232 GPIB Ether net you can send SCPI VFD display CH01 CC OFF Vdc 0 0000V Adc 0 0000A Wdc 0 00W Sync On Set Von Meter Von Von Exit point Latch command VOLT ON lt n gt to set Von
18. sure that the following parameters of electronic load match that of PC Baud rate 9600 4800 9600 19200 38400 57600 115200 You can enter system menu through panel to set communication baud rate 1 Data bit 8 2 Stopbit 1 3 Parity none even odd EVEN seven data bits with even parity ODD seven data bits with odd parity NONE eight data bits without parity 4 Local address 0 31 default setting is O Parity None Start Bit 8 Data Bits otop Bit 67 e USB interface use cables with double USB interface to connect load and PC All electronic load functions are programmable over the USB The USBA88 interface capabilities of the electronic load are described below The interface is 488 2 USB488 interface The interface accepts REN CONTROL GO TO LOCAL and LOCAL LOCKOUT requests The interface accepts MsgID TRIGGER USBTMC command message and forwards TRIGGER requests to the function layer The USB488device capabilities of the electronic load are described below The device understands all mandatory SCPI commands The device is SR1 capable The device is RL1 capable The debice is DT1 capable When communicating with PC you can just select one method of all the communication methods above 68
19. to ensure adequate for air circulation 118700 series can be mounted in a standard 19 inch rack panel r cabinet When it s mounted there s no need to remove the bottom studs You can achieve it use IT E153 optional CAUTION Do not block the fan exhaust at the rear of the Load When the load uses on the desk make sure there enough space on the bottom of the equipment for air circulation 2 4 1 Installation Mainframe dimension 445 mmW x 183mm H x 549mm D The outline diagram in fig 2 4 gives the dimensions of the electronic loads E o 6 I N AAA P EE SEA TETI p I MN RETA MAALT VA JM o M o O a 8 so 000 poso E 5009 bodo ffioaoa bono ibaa AY RS O pje MO O A D R iin 4 rit N mi 9 i iz i E P 4 L o IT8703 Extended mainframe installation figure dimension is same as IT8702 unit milimeter mm figure2 3A IT8702 and IT8703 outline diagram Figure 2 4 118702 and 118703 dimensioned drawing Module dimension 82 mmW x 183mm H x 549mm D IT8711 IT8712 IT8722 The outline diagram in figure 2 5 gives the dimensions of module Fig 2 5 module outline diagram Chapter 3 Power on check 3 1 Power cord configuration Connect the correct power cord to the connector on the rear panel of the load Please select the line voltage type of your region from the power cord below If the wrong power cord was shipped contact your nearest vendor of us c fs 3 CHINA
20. up to 100 files which can be saved in EEPROM address Edit testing files Operations VFD display 1 Power on the electronic load RUN PROGRAM 2 Press Cshift key to enter the menu RECALL PROGRAM EDIT PROGRAM 60 3 Press GD key to move menu to gt EDIT PROGRAM to edit testing files 4 Press key to enter the next menu 118700 can be max extended to be 16 channels 0 represent the number of IT8702 main frame 1 stands for the number of the extended main frame 07 05 03 ulindicater 1 3 5 7 channels have been eguipped with loads next to the main frame is channel 1 the others followed are numbered in order Press numeric keys to select the channel to be tested o7 o5a3c1changes to o7oYoYo1 it stands for 3 5 is selected to be edited Press to confirm 5 Select the steps needed to test if you want to test 4 steps please press in order 1 2 3 4 0 stands for the tenth step If you want to cancel a aa press again the numericO keys you want to cancel Press to confirm 6 In the 4 steps if you want to suspend e g you want to suspend step 2 press numeric key 2 press to confirm 7 Edit the 1 step of the 4 steps determine whether need short circuit testing in channel 3 and 5 for example channel 3 need short circuit testing press number 3 press to confirm 8 Set with load time if you want to load 25 press numeric key 2 then press to confirm 9 Set unloading time if you need 25 press numeric key 2 then press to c
21. value send VOLT LATch ON to enable Von LATCH function 6 11 Meter 118711 118712 6 11 1 Metering operation Set the meter function appropriatly according to your actural measurement needs Press aw enter the setup of meter Range select VRANGESEL Voltmeter range select MGHVRANGE Highrang LOWVRANGE Lowrange jAUTO 9 JAutomaticrange jAMODESELECT Ammeter mode select maximum current SPEED Speedselectt Bu eux SLOW 26Hz Slowspeed MEDIUM 172HZ Medium speed FAST 384HZ Fastspeed jFLLTERSTATE Filterfunction jJOFF DEFUALT pDisable filter function FILLTERMODE gSetupFilter mode 96 JAVERAGING Averaging mode ADVANCE pa o AVERAGE CNT Setup average cht Voltmeter select There are 3 range for voltmeter high range low range auto range High low ranges are dependent on the specific models Auto range means the load will automatically adjust high low ranges according to the actual measurement value To single channel module 118711 you can select low range to increase the accuracy when measure input which is lower than 18V If it s over 18V you must select high range Ammeter select There are 2 kinds of ammeter mode MEASURE ADX measure DC current MEASURE AMAX measure max current MEASURE ADX means when measuring VFD only display the DC part of the current The actua
22. 0 01mA measuring speed could reach 50KHZ With remote sense function Short circuit function otorage capacity 101 sets List mode enable you to edit a list file in CC mode number of list steps 2 84 each step time 0 000020 3600s You can save seven list files CR LED function V VVVV WV 1 3 Front panel description There re two parts in front panel which are main panel and module panel Please read figure 1 1 for details Main panel and module panel keys function will be introduced below Figure 1 1 118700 front panel VFD display Module keyboard lt A B gt lt Short gt lt Tran gt lt Mode gt lt On Off gt and direction keys Adjustment knob change parameters Mainframe function keyboard control each channel s operating status specific buttons Chan Save lt Reall gt Setup lt On Off gt Trig Start Pause Enter Shift lt A gt V Mainframe compound button numeric keys 1 set parameters 2 assembled menu function detailed buttons lt 1 gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt plus function keys to enter the system menu 6 plus function keys to enter the config menu lt gt plus function keys to enter program menu 8 plus function keys to select local operation 9 plus function keys to select lock function lt 0 gt lt gt El Power switch ON OFF 1 4 Rear panel description The part introduces the location of terminals and interf
23. 46 Circuit principle is as follows Ranges You can select the lower or higer range for CZ mode too Impedance can be edited in either of the two ranges Low range will supply higher accuracy and better resolution when you set lower impedance Any value you set is outside the maximum value of the LOW RANGE you should select HIGH RANGE Immediate impedance level You could set the impedance level via front panel lf the load is in CZ mode the new setting impedance level immediately changes the input at a rate determined by the slew rate If the load is not in CZ mode the setting impedance level will be saved for use until switch to CZ mode You should select the channel to be edit before setting Press SETUP button to enter the CZ mode After you choose the high low range the front panel will display as follows CHO1 Rset 7500 0 22 Ymax o6ZV Y nin 0 RLC R 7500 0 2 RLC L OuH RLC CINE Hset 7500 00 set the impedance value R Vmax 82V set the maximum voltage Vmin 0V set the minmum voltage RLC R 7500 00 set the series resistance value Rs RLC L 0uH set the series inductance value Ls RLC C 10uF set the parallel captance value C Example R set 11 50 RLC R 10 RLC L 10uH RLC C 100uF 6 3 6 Operations The following will show you how to set operation mode on front panel Take CC mode as an example 47 Operations 1 Power on the electronic load 2 Press CAD or GD keys to select the channel to be edited such
24. 700 series electronic load can achieve remote control via GPIB RS232 USB ETHERNET but only one interface can be used at one time choose the interface via the system key SYSTEM Connect Communication cable before power on Do not support hot plug as it may damage communication interface of electronic load The fowllowing picture shows how to connect RS232 cable between electronic load and PC and show the specific configuration Procedure 42 VFDdisplay 1 Conncet RS232 cable ERN 2 Power on the electronic load MI i 3 Select channel number via key such as channel RS232 4 Enter system menu via SHO key use ED to choose USB TMC USB488 communication press MED key to enter use uum key to GPIB ETHERNET BAUDRATE SET PARITY SET choose RS232 press Entel key to confirm 5 Now Display return to main menu use key to choose lt RS232 gt menu press numeric keys Enten key to enter First set HANDSHAKE SET baudrate set use ERED key to choose and enter use EXIT key to choose parity set use Ene key to choose none and confirm use ab key to choose lt Handshake Set gt use ED Gated key to choose None and confirm 6 3 Operating modes The electronic load can work in the following 3 mode 1 Constant current operation mode CC 2 Constant voltage operation mode CV 3 Constant resistance operation mode CR 4 Constant power operation mode CW 5 Constant impedance operatio
25. 9 Figure 5 10 Remote sense connection 5 6 5 External analogue control You can control the voltage and current setting of the electronic load by the analogue terminals pin 7 and pin 8 0 10V adjustable analogue simulate the O fullscale to regulate the input voltage and current of the electronic load 10V indicate the full range of load voltage or current value 5 7 Load connection N WARNING To safety reguirements load wires bestween the electronic load and the object to be measured should be heawy enough not to overheat while carrying the short circuit output current Betore connect object to be measured to load please remove the cover on the output terminals of the load and cover it after finished the connection Please pay attention to the type length and polarity when wiring Please avoid using wires of minimum specification of anti superheating which can not supply good load regulation Generally speaking if the wires are short enough they can control voltage drop less than 0 5V In addition bonding them together can reduce induction and noise Please lead wire from positive teminal on the rear panel of module to positive teminal of object Similarly connect the corresponding negative teminal Figure 5 11 illustrates a typical connection of the module with the device to be measured 40 Figure 5 11 connection of load and object There re two positive terminals and two negative teminals on the rear panel of every moduel
26. CTS ITITS I 2 ine a a aM ida 56 O le Meltering ODSF SHOE ie tovs A lu Cas o e o ecu Sa AAA oa 56 6 11 2 Metering function front panel operation nnns 57 6 12 PROTECTION FUNCTION Si dd dede 58 612 Over voltage protecion OVP lit mt AA AA A vau tee aes 59 612 2 Over current protection OOPS A 59 6 12 3 Over power protection OP Py as do Ge 59 6 12 4 Over temperature protection OTP a nnne nennen nnne nnn nnns nna 60 6 12 5 Reverse voltage protection LRV RRV a enne nennen nnne nnn nnn nis 60 6 13 SAVE AND RECALL OPERATION Ai ki 60 6 14 AUTOMAATI TEST e REN LT m TI M 60 6 15 CR LED FUNCTION eter ani 63 GHAPTER7 REMOTE OPERATION s caccia eua cho ran pool uttu quo cuu E ova cuu ki ak Reg dve ea 65 Warranty Information Certification We certify that this product meet its published specifications at time of shipment from the factory Warranty This hardware product is warranted against defects in material and workmanship for a period of ONE year from date of delivery IT8700 series electronic load for use with a hardware product and when properly installed on that hardware product are warranted not to fail to execute their programming instructions due to defects in material and workmanship for a period of 90 days from date of delivery During the warranty period our company will either repair or replace products which prove to be defective Our company does not warranty that the
27. ECTIONS asi mede carie eu perio rae ive le 37 SO CONTROLLING TINK aa EE 38 5 5 1 Voltage talle INGICAU OM ae ei r 39 Oro 2 81014451 21010618 6 1107 HIN MEER ica 39 DO TONG Me up T 39 5 6 4 Remote measurement connection a eene nnne nnns nanus na sans as nnns 39 5 5 o EX Siiial analogue cool iia 40 5 7 ORD GONNEG IONE T eo o a also 40 S O PABALLEE CONNECTIONS Gestionem Rda 41 CHAPTER6 OPERATIONS INTRODUTI N cuina irrita 42 6 UM EOCAV REMOTE OPERATION m 42 SZ deren eee seo PM NE E 42 6 9 OPERATING MODE Scat andado 43 6 31 Constant Current C C MOJE sace vies a ita o iud an cues v D Lacan tS cuti 43 6 3 2 Constant resistance CR MOJE sio lata 44 6 9 9 Constant voltage GV iode occ 45 6 3 4 Constant power CW mode ane 46 6 3 5 Constant impedance CZ mode 46 ODO Operat NS o poe a dae o de a dad 47 6 4 TRANSIENT OPERATION e kina 48 BA COMUMUOUS trino Tener Ahe TANA dno esa ee ase n is ee Du tail 48 DO UNS eo titat ia a A C a E 49 E ole 0 ejo MAMMA MM TC 49 6 4 4 A B transient operations sees nnne nnnm nnne e nnns nnns nans nnn nnns 50 6 5 LIS Tr OPERATION MC c TM 51 676 TRIGGERED OPERATION m c r 53 So As es mia ei eo C UTEM 53 soja s je SOUC ER A TNT 53 SHE ATR IO ERAMETSA a AS PA A NT 54 0 6 INPUT ONIO RP OPERATION cos aias Mk desem Os 54 SOLO SYNCHRONOUS LOAD aaa A ja ea o a aa 54 6 0 VONOPERANON Me RN 54 O TH METER
28. ED to confirm In remote control mode you can send SCPI command to control for example CURR RANG MAX 6 12 Protection functions Load has the following protection functions over voltage protection OVP over current protection OCP over power protection OPP over temperature protection OTP reverse voltage protection LRV RRV The mainframe will act appropriatly once any of the above protection is actived you can press any button on front panel to restore the protection function For example the electronic load come into over temperature protection the buzzer will alarm the input will automatically shut down and Main frame VFD will display OTP 98 6 12 1 Over voltage protection OVP If the OVP circuit has triggered buzzer alarm input will not shut down the status register s OV and VF bit is set the main frame screen will display OVP the condition will remain until they are reset Once over voltage protection occur the 8 pins connector s VF pin on the rear panel will output T TL high voltage level Operations to clear the OVP state Check whether the input voltage is in the load s rated voltage or the programmed protecting voltage ranges if it is outside of the range please disconnect the instrument under test Press any key on the front panel or send commandPROrTection CL Ear the OVP displayed on the front panel will disappear load exits OVP protection state 6 12 2 Over current protection OCP The el
29. HO io open the load s input 16 Press EMM to enable transient operation 17 Press ig key to trigger If in the remote control mode USB RS232 GPIB Ether net you can refer to the following example to edit transient operation refer to IT8700 programming guide to get more CURRent TRANsient MODE CONTinous CURRent TRANsient ALEVel 5 GURRent TRANsient AWIDth 0 6mS CURRent TRANsent BLEVel 10 CURRent TRANsient BWIDth 0 7mS TRANsient ON TRIGger IMMediate 6 5 List operation List mode lets you generate complex seguences of input changes with rapid precise timing which may be synchronized with internal or external signals This is useful when running test seguences with a minimum amount of overhead Generate complex seguences to complete complex tests by editing LIST Seleci different trigger resource editing the step value width time and slew rate of every step The parameters of List operation include the name number of steps 2 255 for IT8711 118712 2 255 2 84 for other modules single step width time 0 000001s 16383s for module IT8711 1T8712 0 000020s 3600s for other modules and every step s set value and slew rate The list file can be saved in non volatile memory used to fast recall 118711 and 118712 modules can edit up to 6 groups list files The other modules can edit up to 7 groups list files Module IT8711 1T8712 has built in square sine triangle and sawtooth waves In list operation mode the load begin t
30. OLD BUS TIMER FUNCTION MODE RECALL LIST EDIT LIST CC LIST CV LIST CR LIST High range Low range Custom wave Sine wave sawtooth List file step 5 Step 001 level 1A Step 001 rate 1A uS Step 001 width 6S Step 002 level OA 14 Set the second step s rise slew rate such as 1A uS Press to confirm 15 Set the second step s time such as 5S press Ente to confirm 16 Setthe 39 to 5 steps in same procedure as 0 5A 1A us 4 5 OA 1A us 28 2A 1 A us 8S 17 Select repeat running times such as 1 press Ente to confirm 18 Select the position to save file such as 1 press Ente to confirm 19 Press CD key to select function mode press Ente Kc to confirm press key to select lt list gt press to confirm 20 Press Es to exit 21 Press oot open the load s input 22 Press to trigger Step 002 rate 1A uS otep 002 width 5S Repeat count 1 CHO01 Save list file 1 Fixed List If in the remote control mode USB RS232 GPIB Ether net you can refer to the following example to edit list operation refer to 118700 programming guide to get more LIST MODE CURRent LIST RANGe 40 LIST COUNT 10000 LIST STEP 4 LIST LEVEL 1 5 LIST SLEW 1 2 LIST WIDTH 1 1 LIST LEVEL 2 1 LIST SLEW 2 2 LIST WIDTH 2 2 FUNCTION MODE LIST TRIGger IMMidiate 6 6 Triggered operation 6 6 1 Trigger function Trigger operation can be used in the following operations transient pulse
31. TL high low level it is a universal output terminal can be used in controlling an external instrument for example the relay used in power testing Dl is used to detect the external level state 5 6 4 Remote measurement connection Remote Sensing SENSE 4 and SENSE are the remote sensing inputs By eliminating the effect of the inevitable voltage drop in the load leads remote sensing provides greater accuracy by allowing the load to regulate directly at the source s output terminals When load is at CV CV or CR mode lead length are relatively long or load regulation is critical or load consumes high current there will be voltage drop in the leads conncted between load and measured object which affect the accuracy of measurement then the sense connection can be applied Fig 5 10 illustrate a typical connection between module and device for remote sense operation Take single channel module for example there re two input connectors One is load input measurement terminal the other is Vsense measurement teminal To module 118711 118712 when Vsense is connected to object to be measured load will switch to Vsense mode automatically no need to set up in menu To other modules you should enable the remote sense function in the configure menu then connect the remote sense lines The front panel of the module show sense CAUTION The electric potential on the positive terminal of Vsense connector must be higher than negative one 3
32. USA Canada Europe England IT E171 IT E172 IT E173 IT E174 L Live or Active Conductor also called live or hot N Neutral or identified conductor E Earth or Safety Ground Figure 3 1 types of power cord 14 Part Number IT E171 T E172 you can choose difference power line Power cord IT IT E173 according to regions TEM E174 information aaa jaaa a information and communication protocol Tesrepot test report before ex factory 3 2 Input voltage selection The load can work under 110 220V 10 AC input as the label shown on the rear refer to figure 3 2 If the default value on the label doesn t match your region s please switch the black key to choose input line voltage and then insert power cord Choose the right linear voltage as following CAUTION Thre s no need to change fuse when linear voltage changes The fuse can protect the electronic load at any setting voltage specified Figure 3 2 power switching keys 3 3 Turn on checkout When you turn on the electronic load the front panel display will light up briefly while the electronic load perform its power on self test The following table show the procedure of the self test Mainframe VFD Describe display When BOIS Ver 1 00 VFD display software version powered on about 15 later SYSTEM SELF system self check TEST about 1S later OE NA detect all modules installed o7o05o0301 about 15 later e g CH01 CV OFF Dis
33. USER S GUIDE Programmable DC Electronic Load Models IT8700 series Copyright 2011 All Rights Reserved Ver1 4 Mar 201 1 IT8700 401 WARRANTY INFORMATION mec 4 CEBRIIBICATION i peniteat ec ehh vac rate atisiten ad ooi alata E ote ot HI ED tuae 4 WARRANT Y scenario teet assit totes oso dite ioi ceto ET el 4 LIMITATION OF WARRANTY aiii 4 ASSISTANCE cuate cid A TA A aa Aaa a 4 SAFETY SUMMARV iiic c li tallavad Quas 4 ENVIRONMENTAL CONDITIONS aaa aid 4 BEFORE APPLYING POWER ui icccteiuicu o a ccu iris islas 5 SAFETY SYMBOLS ET 5 CHAPTER 1 PRODUCTS INTRODUCTION cuusciiacia sion liada alaba 7 ANTRO DTE TION at o tihi 7 2 DESCRIP TION caco oso 99229 T7 1 3 FRONT PANEL DESCRIPTION cessos d queis me DE To es soa ges ei bote ca pnta eru que bas km amka Oa 8 1 4 REAR PANEL DESCRIPTION vecinita 8 CHAPTER 2 INSPECTION AND INSTALLATION ecce eeeeeee nennen nennen nnn nnn nena a snas nnnm nnns 10 2 1 INSPECTION m a 10 22 OVE E da 10 2 3 MODULE INSTALLATION nana 10 A a eu i yal MANA ae ni ST DA 11 2 A MAINERAMEINSTAUEATIONs ideni e e 12 2 4 1 Installation cos oia UNER rr T 12 CHAPTER 3 POWER ON CHECK sott aitada is 14 3 1 POWER CORD CONFIGURATION cccccccccesseeecceeeeecaaeeseececeeeesaeeeceeeesseseeesseeeeese
34. aces on the rear panel see figure 1 2 for more details i id pg gg gg AA4ZAXA A ZGZIAA WqA A AOSOOOOoO 7pA7PpPF oKQDAAAAcUl ULEULALADO JO OALULUL LLLLLSLDICOOOEAAAAAAUAuaUUUeEEeEeEeGb o LoWw AoOANGEUUPUPUOQOQUOQOQOUOUOUOO0OUOo OOUEUUe oeo oeeooeoeee9eoe06Oo0qQUN NU0Ue U UO02o0 zwo Oo AO AA 77 7AOAJAUA UAUUAEEUOAAUUAAAGBabakbco L gdq aU8xloaoabLLULLLLELULUULbLULbLLGLGbE6 ue e mB GULDb tL L S585 5B 7R V 4 S oi SIS Figure 1 2 118700 rear panel 11 Current monitoring terminal Remote sense and external input control terminal Digital I O and VF output signal teminal Power input socket Extended module interface USB communication cable interface 7 Line voltage slection switch 110V 220V 8 Trigger input output and ON OFF input output interface Network interface 9 pin COM port interface connector RS232 communication cable interface 9 pin COM serial port connector extended keyboard interface GPIB interface Positive input terminal of module 5 6 7 8 La 11 12 13 Negative terminal of module Chapter 2 Inspection and installation This chapter will introduce the acceptance items after you receive the new unit 2 1 Inspection Please confirm whether the outer box is good then broke open the packing cases to see if there is any damage caused in the transportation Simultane
35. ation Fig 6 6 continuous transient operation current waveform 6 4 2 Pulsed In this mode electronic load will generates a transient pulse of programmable width when pulsed transient operation is in effect In pulsed mode you can set A B level A B width and A B slew rate via mainframe keyboard The electronic load will automatically switch to A level after maintaining A width time switch to B level it won t swith to A level until the the instrument receive the pulse signal The following picture show the current waveform in pulse transient operation j 1oms E I fone i ms m TRIG TRIG Pulsed Transient Operation SA Fig 6 7 pulsed mode current waveform 6 4 3 Toggled In toggle mode the electronic load will switch between A level B level when receiving a triggering signal after the transient operation is enabled The following picture show the current waveform in toggle transient operation 49 o TRG Toggled Transient Operation TRG Fig 6 8 toggled mode current waveform 6 4 4 A B transient operations Operations 1 Power on the electronic load 2 Press quem Em keys to select the channel to be edited such as channel 1 3 Press Setup key to enter the channel setup menu press key to enter the mode selection menu Mode press key to select the mode CC CV CR CW CZ such as CC press key to confirm 4 Press es key to enter range setting Range press pus enter the mode selection me
36. by GPIB or USB or GET communication interface then if get the TRIGG command the load will produce a trigger signal 4 When select timer trigger mode first set the trigger source as TIMER set the TIGGER TIMER s time the load will produce a singal from time to time 5 When select hold trigger mode first set tirrger source as HOLD the load will produce signal when get the TREG IMM command Pin 2 will output corresponding trigger signal whatever trigger mode you choose 5 4 2 External ON OFF control connection o Figure 5 6 ON OFF IN is used to control the multi channel to take load or unload synchronizelly When ON OFF IN pin receives a low pulse ON OFF state of load will reverse If SYNC ON SET of a specific channel is set ON then you can use figure 5 6 connection to control its ON OFF state ON OFF OUT indicates ON OFF state of multi channels electronic load If SYNC ON SET of any specific channel is set on and the channel s input state is on the pin 4 output low level otherwise it output high level 5 5 Extended frame connections a Figure 5 7 Expand interface This interface can be used to connect extended frame IT8700 can take up to 16 channels with extended frame Procedure Use expand cable to connect mainframe and expand interface of extended frame Enable expand function in the menu of 118702 mainframe by pressing select Expand modul choose ON 37 J z DI LL kh LA EL ARA ET LOLL A Z
37. dule in case the input DC voltage lines are connected with wrong polarity Once in reverse connection condition input will be immediately turned off buzzer alarm status registers LRV RRV and VF bits will be set main frame screen displays LRV RRV they will remain until they are reset In this condition the 8 pins connector s VF pin will output a high level Operations to clear the reverse voltage state Check whether the connection is reversed if so disconnect the object to be meaured 6 13 Save and recall operation The stored setting of all channels can be recalled the stored parameters includes working mode voltage current value slew rate transient setting and so on It can save up to 101 groups of setting parameters The 0 group can be used as boot parameters The 1 to 100 groups can be used as automatic testing parameters All the parameters are saved in the non volatile memory won t lost even in power down state You can use SAVE key to save parameters press RECALL key to fast recall Save and recall operations Operations VFD display 1 After setting the parameters press Sae key to save Save Group press number 9 press to confirm 0 Recall Group 2 Press Real key press Oj to recall the saved data 0 6 14 Automatic test Automatic test function of 118700 series electronic load is very powerful it can simulate various test It can edit up to 10 groups of testing files each file has 10 steps it can edit
38. e USB RS232 GPIB Ether net you can use RES RANG command to resistance range Immediate resistance level Set the resistance level via front panel or sending GPIB command RES lt n gt if the load is in CR mode the new setting resistance level immediately changes the input at a rate determined by the slew rate If the load is not in CR mode the setting resistance level will be saved for use until switch to CR mode 44 Triggered voltage level This function only can be used in remote control mode when the load is in the CR mode after receive the RES TRIG command subsequent triggers will have no effect on the input unless another triggering signal is sent RES command will cover the RES TRIG value this function is used to synchronize Multi channel input load changes Transient resistance level Set A B transient resistance level on front panel or by remote operation the load can continuouly toggle between the two level when transient operation is turned on Set slew rate IT8711 and IT8712 The resistance slew rate determines the rate at which the input to a module changes to a new programmed vaule You can set resistance level s rise fall slew rate on the front panel or by remote operation The slew rate programmed act in effect to the immediate triggered and transient resistance level changes 6 3 3 Constant voltage CV mode In this mode the electronic load will attempt to sink enough current to control the source vo
39. e the transient response and export measured values in time Built in waveform generator and LIST mode Ethernet GPIB USB RS232 interfaces Chapter 1 Products Introduction 1 1 Introduction This user s manual introduces the specifications installation operation and programming of 118700 series DC electronic loads There re two parts in 118700 DC electronic loads mainframe extended frame and modules The frames mentioned are 118702 mainframe and 118703 extended frame Modules refered to are 118711 118712 118731 IT8732 118732B 118733 IT8733B 118722 and so on The range of every module s specific voltage current and power will be introduced in the specifications in detail 1 2 Description The dimension of 118702 is same as that of IT8703 The difference is that 118702 is four modules control unit while 118703 is a extended unit There are up to 8 channels in 118702 mainframe After extended with 18703 mainframe it can be up to 16 channels All panel operation and programming are also carried on the 118702 main panel One module could have one or two channels each module will have its own channel number according to the slot position In the case of IT8702 mainframe if each slot has one channel then the channel number from right to left should be 1 channel 3 channel 5 channel For module with dual channels the channel number should be 1th and 2th channels 3th and 4 channels 5 and 6 channels IT8703 extended mainframe can be unde
40. ectronic load includes both hardware and software over current protection features Hardware OVP load s maximum input current will be limited at about 11096 of the current range once the hardware OCP is triggered the status register s OC bit will be set when the hardware OCP is removed the status register s OC bit will be reset Hardware over current protection won t affect load s on off state DO OCP users can set load s software OCP value steps gt Protect gt Alimit set ON Apoint set OCP current value Adelay set delay time Sonn alarm When the software OCP function is actived if the load current value is over the over current protection set value load will automatically off VFD displays OCP At the same time the OC and PS bits in the status register will be set they will remain until they are reset Operations to clear the OCP state Check whether the input current is within the load s rated current or the programmed protecting current ranges If it is outside the range please disconnect the instrument under test Press any key on the front panel or send commandPROTection CL Ear the OVP displayed on the front panel will disappear load exits OCP protection state 6 12 3 Over power protection OPP The electronic load includes both hardware and software OPP features Hardware OPP the electronic load allows user to set a power protection limit in hardware which will limit the power in the range you set when the OPP co
41. el to be edited on the main frame panel first then start to edit e g if you want to edit the 5 channel press Gra key first the VFD will show all the installed channels press number key 5 directly to switch to 5 channel now the channel can be edited Sa oy is used to save data after selecting the channel edit its parameters set work mode voltage current Slope the dynamic parameters and so on Press key to save up to 101 groups of parameters can be saved All the parameters are saved in the Non volatile memory support power off saving Recall key is used to recall data Recall key can be used to fast recall the saved 101goups parameters All the used parameters are only need to be edit and save for one time they will be always saved in the EPROM You just need to recall them if necessary It brings great convenience to the users and save time 24 GHD Ley is used to enter the specific channel s menu press this key you can achieve A B transient mode CC CV CH mode and so on this menu has been introduced in detail in the menu list QUO key is used to control module s input state on off when you enabled the synchronization function in the menu of a channel the key can correspondly contro the on off state of the channel GD Ley is used to trigger when you edit the auto test file or the transient output you should select the triggering source this load have 5 kinds triggering mode panel triggering is only one of the
42. es 6 3 4 Constant power CW mode In CW mode electronic load will consume a constant power As shown in fig6 4 when input voltage increase the input current will decrease while power will remain the same P V I Setting power Load current Fig6 4 CW mode Ranges You can select the lower or higer range for CW mode too Power can be edited in either of the two ranges Low range will supply higher accuracy and better resolution when you set lower power Any value you set is outside the maximum value of the LOW RANGE you should select HIGH RANGE Immediate power level You could set the power level via front panel lf the load is in CW mode the new setting power level immediately changes the input at a rate determined by the slew rate If the load is not in CW mode the setting power level will be saved for use until switch to CR mode Transient power level oet A B transient power level on front panel or by remote operation the load can continuouly toggle between the two level when transient operation is turned on 6 3 5 Constant impedance CZ mode Innovative CZ technology using A D to sample and then build in DSP calculation processing to simulate the transient current wave of the tested components lts internal calculation equation is as follows E m Fr eg Fritza Es Ig Fon i Fr eg Zr A 1 Yi cr represents the shunt conductance of CL and RL Zia represents the impedance of LS Yo represents the impedance of CL
43. he edited first step of channel 3 and channel 5 SAVE GROUP press ED and numeric key 1to save step 1 in the same 0 way you can edit the rest 3 steps of channel 3 and channel 5 after saving press Ente to confirm Recall testing files The following way can make you fast recall the edited testing files from EEPROM after re powering Run testing files Operations VFD display 1 Press CORO to enter the menu i M Ar EDIT PROGRAM EXIT 2 Press YD to move to lt RECALL PROGRAM to recall the saved testing files 3 Press to exit 4 Press id key to start automatic testing if you need to pause press CAD key then press Ez key to continue 6 15 CR LED function 63 The CR LED function of IT873X and IT8722 makes it ture that they can simulate the real characteristics of the LED lights when test the LED power drive constant current source LED light is usually combined by a number of diodes but the diodes only works when the voltage reaches the turn on voltage value more over usually the ripple of the LED power drive is rather large so the tranditional CR mode of Eolad can not meet the test of LED constant current source the fail phenomenon can be the readback current or voltage lack instability 118 8X and 118722 modules with the CR LED functions can fully simulate the characteristics of the LED lights you can set Vd value to simulate the diode turn on voltage characteristics so that your test is more accurate
44. hen the short is turned on In CC CR mode the maximum short current is 12096 of the current range In CV mode short means setting the load s constant voltage to be OV When in remote control mode USB RS232 GPIB Ether net you can send SCPI command INPut SHORt ON to enable the short operation 6 8 Input on off operation In front panel operation conditions press Ono key to switch to on off state Input on off operation won t affect the present settings The load unload speed of On off operation is not dependent on the rise fall slew rate When in the remote control mode USB RS232 GPIB Ether net you can send SCPI command INPut ON to open input 6 9 Synchronous load To any channels press Shift Config key to enter configuration menu set SYNC ON SET to be ON When turn on this function key can control the input state of the corrspondent module sychronously When in remote control mode USB RS232 GPIB Ether net you can send SCPI command INPut ALL ON to synchronously load all channels 6 10 Von operation You can set voltage value Von Voff to control the input state on off for electronic load When the input voltage reaches the Von value the load s input state is on When the input voltage reaches the Voff value the load s input state is off This function can protect the power supply when the rise fall speed of it is very low For example when you test a power supply s discharging you can set the
45. l value the VFD displays is equal to the ammeter s reading which is the DC part of the circuit MEASURE AMAX means when measuring VFD displays the max current value in the circuit When the load is simulating short circuit function MEASURE AMAX function make you can observe the over shoot current value in Speed select There are 4 kinds of speeds HIGH ACCURARY SLOW lt 26HZ gt MEDIUM lt 172HZ gt FAST lt 384HZ gt When load is in remote control mode you can send a query command for example MEAS CURR to measure voltage current and power When load is addressed to talk the measurement will be read back Power is calculated from the voltage and current Voltage and current are measured simultaneously so the power value is correct All the measurements are performed by digitizing the instantaneous input voltage or current for a defined numbers of samples and sample interval storing the results in the buffer and then calculating the measured result Many measuring parameters are programmable includes numbers and interval of sampling and trigger mode Between these parameters and the measuring speed accuracy and stability under the present noise there is a tradeoff 6 11 2 Metering function front panel operation The electronic load itself has metering function When it is with load every channel s actual voltage current and power will real time show on the panel Measure DC value Operations VFD display 1 Power on the elect
46. lectronic components It is configured by plugging the user selectable modules into the mainframe and operated using the keypad and rotary knob on the front panel or the remote controlled instructions via Ether Net USB RS 232C or GPIB interface The high resolution voltage 0 1mV current 0 01mA measurement system Up to 1k Hz sampling provides both accuracy and convenience User can simulate a wide range of dynamic loading Up to 25K Hz applications The loading waveform is user programmable in slew rates load levels duration and conducting voltage Hemovable channels increase system flexibility Dynamic Power distribution function for dual channels save your cost Dual channel module can display every channel information simultaneously with no need to switch Measure peak current in short circuit Transient mode Up to 25KHZ List mode 100KHZ Measurement resolution 0 1mV 0 01mA Measurement speed up to 1KHZ A unit with single mainframe can take up to 8 channels with extended mainframe up to 16 channels Adjustable slew rate Support several electronic loads working at the same time Auto test function Output resolution up to 16 bits voltmeter and ammeter reach 5 1 2 digits Constant current CC constant voltage CV constant resistance CR mode Highlight VFD display for both mainframe and load modules Support USBTMC SCPI communication protocol Output terminals on the rear panel make wiring easy and keep front panel clean Simulat
47. ltage to the programmed value See figure 6 3 V VOLT LOAD INPUT SETTING VOLTAGE LOAD CURRENT CONSTANT VOLTAGE MODE Fig 6 3 CV mode Ranges For module IT8711 and IT8712 in CV mode there is no ranges selecting function Voltage level Set the voltage level on front panel or by sending SCPI command VOLT lt n if the load is in CV mode the new setting immediately changes the input at a rate determined by the voltage slew rate If the load is not in CV mode the set voltage level will be saved in the instrument for use until switch to CV mode Triggered voltage level This function only can be used in remote control mode when the load is in the CV mode after receive the VOLT TRIG command subsequent triggers will have no effect on the input unless another triggering signal is sent VOLT command will cover the VOLT TRIG value this function is used to synchronize Multi channel input load changes Transient resistance level Set A B transient voltage level on front panel or by remote operation the load can continuouly toggle between the two level when transient operation is turned on 45 Set slew rate IT8711 and IT8712 The voltage slew rate determines the rate at which the input voltage to a module changes to a new programmed vaule You can set voltage level s rise fall slew rate on the front panel or by remote operation The slew rate programmed act in effect to the immediate triggered and transient voltage level chang
48. m It will be introduced in detail in the front panel triggering operation chapter GED key is used to start automatic test after recalling the edited automatic test file press GED key to start automatic test CED key is used to pause only press Pause key to pause when running a automatic test at this time the VFD will display pausing at a step press key once again to test the file continuously 4 Comprehensive key 0 O number keys o Ore number input keys em 0 09 key will respectively enter 3 menu it has been introduced in detail in the menu list if the load is in remote sense mode press em D key can switch to local mode DO key can lock module s panel keyboard and knob re press them can unlock it ori key can be used to exit any M state 0 means a point a key is used to move up select the menu key is used to move down select the menu Entel key is used to confirm key is a Comprehensive key 5 1 2 Menu list B Setting menu Press GHD Ley to enter menu setting view the menu in VFD and use Ca and to scroll through the M Y menu list as following press Ente ko y to enter the selected menu function use and ED io scroll through the VFD screen press Enter key to enter the under submenu press back to the previous menu selection page Pressing number keys can directly select a channel Setup menu list of IT8711 IT8712 module SET UP MODE Select working mode CONST CURRENT Load works in CC mode
49. m relative humidity of 9596 and at altitudes of up to 2000 meters Refer to the specifications tables for the ac mains voltage requirements and ambient operating temperature range Before Applying Power Verify that all safety precautions are taken Note the instrument s external markings described under Safety Symbols Ground the Instrument This product is a Safety Class 1 instrument provided with a protective earth terminal To minimize shock hazard the instrument chassis and cover must be connected to an electrical ground The instrument must be connected to the ac power mains through a grounded power cable with the ground wire firmly connected to an electrical ground safety ground at the power outlet Note Any interruption of the protective grounding conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE Do not operate the instrument in the presence of fumes or flammable gases KEEP AWAY FROM LIVE CIRCUITS Operating personnel must not remove instrument covers except as instructed in this Guide for installing or removing electronic load modules Component replacement and internal adjustments must be made only by qualified service personnel Do not replace components with power cable connected Under certain conditions dangerous voltages may exist even with the power cable removed To avoid injuries always disconnec
50. mall plastic cover under the AC input connector on the rear panel of the load then you can see the fuse Please use the matching fuse figure2 6 shows the fuse location 3 2 t Fig 3 3 fuse location Chapter4 Technical specification 4 1 Main technical parameters Model IT8793 BID Input current VA Been ONAA 1V at 40A 0 14V at 6A 1 4V at 60A GU mode accuracy 0 05 0 02 FS 0 05 0 025 FS 0 05 0 02 FS 0 05 0 025 FS p Dynamic mode Dyiamic mode 5uS 100ppm 5uS 100ppm ns 2 0 0001 0 25AWUS 0 001 2 5A US 0 0001 0 35A u8 0 001 2 5A uS Measuring range Readback 0 18V 0 80V 0 18V 0 80V 17 imi E 025 0 025 Ti 0 025 4 0 0250610 02504F8 210 025 RAM FS rege 04A pem 0 05 0 05 FS 0 05 0 05 FS Protection range OPP ROW OW Specification resistance Input impedance 120KO 120KO 82 183 573mm 82 183 573mm 5KG Model IT8732B IT8733 NPU 0 500V 0 80V voltage 0 40 C current Input power 300 W 600W 0 7V at 3A 4 5V at 20A 0 18V at 12A 1 8V at 120A range 0 18V 0 500V 0 18V 0 80V CV mode 0 05 0 02 FS 10 05 E 02979 0 05 0 02 FS 59 09 um cid 0 20A 0 12A 0 120 CC mode 0 01mA accuracy 0 05 0 05 FS 209 10 09 F 4 0 089640 196F8 H0 1M0 0 100ES S Cuide 0 250 100 100 7 5K0 0 20 100 100 7 5K0 16bit 0 01 0 08S 0 01 0 0008S 0 01 0 08S 0 01 0 0008S Input 300W 600W voltage Rated value input 0
51. n mode CZ 6 3 1 Constant current CC mode In this mode the electronic load will sink a current in accordance with the programmed value regardless of the input voltage See figure 6 1 CURRENT LOAD SETTING CURRENT LOAD INPUT V VOLTAGE CONSTANTCURRENT MODE Fig 6 1 CC mode Ranges When work in CC or CR mode you can press GHD key to enter the menu when it show RANGE you can select either of the two overlapping ranges lt LOW RANGE gt or lt HIGH RANGE gt Current can be edited in either of the two ranges Low range will supply higher accuracy and better resolution when you set lower current If any value you set is outside the maximum value of the LOW RANGE you should select HIGH RANGE If the electronic load work in remote control mode USB RS232 GPIB Ether net you can use CURR RANG command to switch current range Caution when work in CV mode no range selection function Immediate Current value 43 Set the current level via front panel or sending GPIB command CURR lt n gt if the load is in CC mode the new setting current level immediately changes the input at a rate determined by the slew rate If the load is not in CC mode the setting current level will be saved for use until switch to CC mode Triggered current level This function only can be used in remote control mode when the load is in the CC mode after receive the CURR TRIG command subsequent triggers will have no effect on the input u
52. ndition occur Software OPP users can set load s software OPP value steps Shift 5 Protect Point set OPP power value Plimit set alarm delay If the load power value is OPP delay time load will automatically turned off VFD will display OPP At the same time the OP and PS bits in the status register will be set they will remain until they are reset Operations to clear the OPP state Check whether the input power is in the rated power range or the programmed protecting ranges if it is outside the range please disconnect the instrument under test Press any key on the front panel or send commandPROTection CLEar the OPP displayed on the front panel will disappear load exits OPP protection state 09 6 12 4 Over temperature protection OTP Each module has an overtemperature protection circuit which will turn off the input if the internal temperature exceeds safe limits When load s internal circuit temperature is over 85 C load will enable OTP Input will automatically turned off VFD display OTP At the same time the OT and PS bits in the status register will be set they will remain until they are reset Operations to clear the OTP state when load temperature dropped to the protecting point press any key on the front panel or send command PROTection CLEar the OTP displayed on the front panel will disappear load exits OTP protection state 6 12 5 Reverse voltage protection LRV RRV This function protects the load mo
53. nless another triggering signal is sent CURR command will cover the CURR TRIG value this function is used to synchronize Multi channel input load changes Transient current level Set A B transient current level on front panel or by remote operation the load can continuouly toggle between the two level when transient operation is turned on Set slew rate The current slew rate determines the rate at which the input current to a module changes to a new programmed vaule You can set current level s rise fall slew rate on the front panel or by remote operation The slew rate programmed act in effect to the immediate triggered and transient current level changes 6 3 2 Constant resistance CR mode In this mode the electronic load was equivalent to a constant resistance as shown below the electronic load will linearly change the current according to the input voltage See figure 6 2 LOAD SLOPE CURRENT RESISTANCE SETTING LOAD INPUT V VOLTAGE CONSTANT HESISTANCE MODE Fig 6 2 CR mode Ranges You can select the lower or higer range for CR mode too when it show RANGE you can select either of the two overlapping ranges LOW RANGE or HIGH RANGE Hesistance can be edited in either of the two ranges Low range will supply higher accuracy and better resolution when you set lower resistance If any value you set is outside the maximum value of the LOW RANGE you should select HIGH RANGE If the electronic load work in remote control mod
54. nly describes the main frame s front panel keyboard operation single dual channel module keyboard operation and VFD display 5 1 Mainframe operation The frontpanel keys is effective only in the local mode When the load is powered on it works in local mode automatically and then you can select channel number and set parameters such as voltage current via the front panel keys When the load is repowered on the mainframe will scan all the installed modules once again and can recall the parameters of the last power off 5 1 1 Mainframe keyboard functions introduction 23 IT8702 Electronic mainframe Fig 3 1 IT8702 mainframe front panel 1 Power switch turn the electronic load on and off Connect the load with 110 220V voltage correctly press the POWER button all the front panel will light up briefly while all the channels perform the power on self test VFD display press the POWER key the VFD screen lit and shows the version number of this instrument s BOOT software about 15 later the system begin to self test after about 15 check all the installed modules of the load and display every channel s number voltage and current measurements Function keys the following are the detailed description about the functions and specific operations achievable of all the keys Switch channel via Chan key IT 8700 is a muti load one main frame controls all modules Every module has its own channel number select the chann
55. nu Mode press key to select such as low range press key to confirm CC CR mode have two ranges to all the modules 5 Press GD key to enter the current setting lt gt such as set the current to be 1A uS press key to confirm 6 Press YD key to enter the rise slope setting els such as set the rise slope to be 2A uS Press Enter key to confirm 7 Press EBD key to enter A LEVEL setting I RANa such as 10 004 press key to confirm 8 Press key to enter A level width setting Ta such as 0 0035 press Enter key to confirm 9 Press key to enter B level setting lt TRANb gt such as 2 00A press Enter key to confirm 10 Press key to enter B level width setting Tb such as 0 0025 press Enter key to confirm 11 Press key to set transient operation mode o0 VFD display CH01 CC OFF Vdc 0 0000V Adc 0 0000A Wdc 0 00W CH01 Mode CC RANGE HIGH Iset 9 000A CHO HIGH LOW RANGE RANGE CH01 Rise Speed Set 1 00A Us CH01 Fall Speed Set 2 00A Us Transition A Level 10 00A Tran A Width 0 003S TRAN B 2 00A Tb 2 0 0025 CONTINUOUS lt Tmode gt such as continuous mode press Enter key to confirm 12 Press key to exit MANUAL 13 Press Grn 4 keys to enter system menu function EXTERNAL press enm key to select lt Trigger source such as HOLD select Manual on the front panel press Enter key to BUS confirm TIMER 14 press key to confirm 15 Press C
56. o enable the list operation once receive the trigger signal until the list operation is completed or the instrument receive another trigger signal ol Trigger 0 1 2 34 5 List count 1 e List count 2 gt List seguence Fig 6 9 List mode current waveform LIST operation mode Operations 1 Power on the electronic load 2 Press MAD GD keys to select the channel to be edited such as channel 1 3 Press Shit Gystem keys to enter system menu function press key to select Trigger Source such as select Manual on the front panel press key to confirm 4 Press Gia close the load s input 5 Press Shift em press GD key to select lt list gt press Enter key to confirm press List lt Edit list gt press key to confirm key to select 6 Select list running mode such as CC mode press Enter key to confirm 7 Select high low ranges such as low range press Ente to confirm 8 Select wave such as custom wave press Ente to confirm 9 Select Lists teps such as 5 steps press Ente to confirm 10 Set the first step s current such as 1A press Enter key to confirm 11 Set the first step s rise slew rate such as 1A uS press key to confirm 12 Set the first step s time such as 6S press Enter key to confirm 13 Set the second step s current such as OA press Enter key to confirm 02 VFD view CH01 CC OFF Vdc 0 0000V Adc 0 0000A Wdc 0 00W MANUAL EXTERNAL H
57. occupied Double channel module has two channels e g 118722 If it s single channel module the channel number is automatically assigned the first number of the slot The following picture show the channel number default order Channel number sequentially are 8 7 6 5 4 3 2 1 For example If 118702 mainframe contains two single channel modules IT8711and two double channels modules 118722 Channel number is automatically assigned to every channel at the sequence from right to left 1 3 5 6 7 8 Now channel number 2 4 aren t occupied You can base on your test request to configure the modules single module 1T8711 1T8712 1T8731 1T8732 1T8732B I1T8733 1T8733B double module IT8722 Channel 7 Channel 5 Channel 3 Channel 1 Fig 2 2B channel number order while installing 4 single channel unit 2 4 Mainframe installation The operating temperature of IT8700 series electronic load is 0 to 40 C A fan cools the electronic load by drawing air through the top and sides and exhausting it out the back The electronic load must be installed in a location that allows sufficient space at the sides and back of the unit for adequate air circulation Minimum clearances for bench operation are 3cm on the top If there are radiator fan in your cabinet please avoid installing the load near the fan for cabinet fan limiting air circulation of load If you are installing equipment on top of your electronic load in the cabint use a filler panel above the unit
58. on you The parameters include A level A width B level B width and transient testing modes The transient testing modes have 3 kinds continuous pulsed or toggled Continuous Generates a respective pulse stream the toggles between two load levels Pulse Generates a load change that returns to its original state after some time period Toggled Generates a repetive pulse stream that toggles between two load levels Similar to continuous mode except that the transient points are controlled by explicit triggers instead of an internal transient generator 6 4 1 Continuous In this mode electronic load will generates a repetitive pulse stream that toggles between two load levels Load could switch the state between two setting value value A and value B In CC mode transient testing can be used to check the stability of the source voltage Transient function have two current levels A level B level which should be in the same range high range or low range You can set the A B level delay time and the rise fall 48 slew via the main frame keyboard The slew rate determine the rate which the level changes at Press key the load will continuously switch between the A B levels preset Transient load are usually used to test the power supply s performance under load continuous changing conditions Figure 6 6 shows the current waveform of continuous transient operation mode 3 0ms 2 0ms A B Continuous Transient Oper
59. onfirm 10 Set testing delay time e g 15 press numeric key 1 Tpf is testing delay time SEQ01 SEGO2 Tpf is testing delay time EXIT ACTIVE CHANNEL O anmuuuug 1 of nb 0301 ACTIVE SEQ 098765Y Y Y Y PASUE SEQUENCE0c00000 43Y 1 SEQ01 SHORT CHO oooooooo aa E SEQO1 ON TIME 20 S SEQO1 OFF TIME 20 S SEGO1 P F DELA Y TIME 1 0 S 11 Repeat 6 9 set the rest 3 steps loading unloading time 61 12 Set the condition when stop testing COMPLETE mean stop STOP CONDITION test When all the steps are a FAILURE mean stop test gt COMPLETE when the testing fails Press keys to select such as lt complete gt press Enter key to confirm FAILURE 13 Whether you need to link to the next file to be tested if you PROGRAM CHAIN need to link to group 2 press number key 2 0 stands for not NO 1 linking to other files Press key to confirm mee IA E IS IA IN Sequence Save Group 1 2 3 4 5 8 9 10 EE MA Dl Sequence AAA EA o PROGRAM 10 1 2 3 4 5 7 10 Seu P O ME MIM tm Save Group 91 92 93 94 95 96 97 98 99 100 14 Save the edited files in EEPROM you can save up to 10 SAVE PROGRAM NO 1 groups of files e g please press numeric key to save the edited file in group 1 and then press HED to confirm Es gt RUN 15 Press key to exit PROGRAM RECALL PROGRAM EDIT PROGRAM EXIT 16 Select the channel you want to
60. operation for the software firmware or hardware shall be uninterrupted or error free For warranty service with the exception of warranty options this product must be returned to a service facility designated by our company Customer shall prepay shipping charges by and shall pay all duty and taxes for products returned to our place for warranty service Our company shall pay for return of products to Customer Limitation of Warranty The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer Customer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation and maintenance Assistance The above statements apply only to the standard product warranty Warranty options product maintenance agreements and customer assistance agreements are also available Safety Summary The following general safety precautions must be observed during all phases of operation of this instrument Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the instrument We assumes no liability for the customer s failure to comply with these requirements Environmental Conditions This instrument is intended for indoor use Pollution degree 2 environments It is designed to operate at a maximu
61. ote meter function no need to set in the menu only need to link the circuit according to remote metering SENSE will be lit up 5 4 8 pin control connector IT8700 electronic load 8 pin connector on rear panel figure 5 5 30 OO A EI T 9 o RE 2 Trigger OUT trigger signal output 2 3 ON OFF IN synchronization ON OFF control signal input ON OFF synchronization OUT ON OFF signal onput a 6 Ne OOO 8 GND Ground 5 4 1 External trigger connections There re five kinds of trigger mode 1 front panel TRIG trigger mode 2 rear panel trigger mode 3 BUS trigger mode 4 Timer trigger mode 5 trigger HOLD mode 1 When select front panel trigger mode first set the tigger source as MANUAL press to start panel trigger mode 2 When select rear panel trigger mode first set the tigger source as EXTERNAL trigger signal input from the 1 pin of 8 pin teminal on the rear panel When select external tigger mode the 1 and 8 send out tigger signal low pulse is effective e g refer to the below connection figure TS The figure just show one way to produce trigger signal When press the button it produce a trigger to change setting value voltage current resistance etc e g switch in transient mode or create pulse in dymatic pulse mode At the same time it can ouput trigger signal in pin 2 36 3 When select bus trigger mode first set the trigger source as BUS connect the electronic load
62. ously make sure the following standard accessories are not missing lf any is missed please contact with the most nearest available distributors Take one unit as a reference e One power line e One user s manual e One delivery inspection report 2 2 Clean If you want to clean the outer cover of the unit please wipe with a dry or moistish cloth Do not clean the unit s internal part randomly Pi RR sure you have cut off the electricity supply before you start the cleaning 2 3 Module installation Cautions Franklinism will damage the module Please install the module according to standard electostatic prevention operation style Avoide touching the circuit board and connectors Installation steps e Turn off the power switch and disconnect the 110V 220V power cord e Take off any packing materials around the mainframe e Push the module into the slot as shown in fingure 2 1 e Fixthe module with a screwdriver the position of the screw is in the upside and backside of the machine frame e Install other modules one by one Mainframe Figure 2 1 module installation 2 3 1 Channel number To IT7800 the channel number for all modules is determined by the location of the modules in relation to right side of the mainframe To IT8702 mainframe the total channel number is 8 the 1 amp 2 channel are always next to the mainframe while 7 8 channels are always next to the left side Load channel number is fixed even if the location isn t
63. output triggered output and list output The electronic load have 5 kinds of trigger modes to Synchronously trigger the tested instrument before enable the trigger function users should first select trigger source 6 6 2 Trigger source keyboard will enable a trigger operation key trigger when the keyboard trigger mode is active press ig External trigger signal TTL level the 1 pin of the 8 pins connector on the rear panel of the main frame is trigger input terminal when external trigger signal is available input a low pulse gt 10uS to the internal the load will enable a trigger operation 03 Bus trigger when bus trigger is available as soon as the load receive a trigger command GET or TRG from the GPIB port the load will enable a trigger operation Timer trigger when timer trigger is available the main frame will enable a trigger operation periodly Trigger maintenance when trigger maintenance is available only when the load receive the trigger command TRIG IMM from the communication port the load will enable a trigger operation 6 7 Short operation The load can simulate a short circuit at its input During front panel operation you can press GD key to switch short on off states Short operation won t affect the present setting When turn off the short state the load returns to the original set state The actual value of the electronic in short operation depend on the mode and range active w
64. play information of channel 1 or the leftmost Vdc 0 0000V channel Use up and down key to select other Adc 0 0000A channels Wdc 0 00W WARNING The electronic load is shipped from factory with a power cord that has a plug appropriate for your location Your electronic load Is equipped with 3 wire grounding type power cord the third conductor being ground The electronic load is grounded only when the power line cord is plugged into an appropriate receptacle Do not operate your power supply without adequate cabinet ground connection 3 4 If the electronic load does not turn on Use the following steps to help solve problems you might encounter when turning on the instrument 1 Verify that there is AC power to the power supply First verify that the power cord is firmly plugged into the power receptacle on the rear panel of the electronic load You should also make sure that power source you plugged the electronic load into is energized Then verify that the electronic load is turned on 2 Verify the power line voltage setting The line voltage is set to the proper value for your country 110VAC or 220VAC when the electronic load is shipped from facory Change the line voltage setting if it s not correct 3 Verify that the correct power line fuse is installed If fuse is blowout please replace it according to the following specification IT8702 IT8703 4 The method to replace fuse Use a flat bladed screwdriver to open the s
65. ple if you don t want the 3 channel to work with other channels Synchronizly you can switch to channel 3 on the main frame press ETAO sev to enter module configuration menu VFD views lt SYNC ON SET gt press key to enter setup OFF state In the same method to setup other functions in the contiguration menu 32 5 1 6 Module keyboard lock Press Ghif O to lock all the operation keyboard and knobs of the current channel panel press Gui key again to unlock 5 2 Module operation 118700 modules have 2 kinds input one is single input module the other is dual input module There are 6 keys on the front panel for each module Bellow are the detail introduction of module panel keys and functions 5 2 1 Single channel module panel IT8711 Electronic load 0 80V 40A 200W Fig 3 2 single channel module panel 1 Modules panel view high brightness VFD display show module s working mode Module s panel keyboard SS aa Dm alii onis ji llis iid bud cssc RR iudi E Move the cursor position Press GBD key to move the cursor to the position you want to edit and then use the rotary knob to adjust value Select the transient mode press key first to enable transient mode before running A B transient operation and then send the triggering signal to run program 33 Rotary knob used to change the setting parameter values kadi Control module s input state on off Module s air inlet 5 2 2 Dual channel
66. ronic load 2 Select the channel such as 1 CH01 CC OFF Vdc 0 0000V Adc 0 0000A Wdc 0 00W Vrange Sel 3 Measure DC voltage and current press ED Os select Amode Select meter press Enter select lt Amode select gt press Enter 51 select lt Adc gt press EHEB to confirm VFD show the present Speed voltage and current readings When in remote control mode you can send SCPI command to measure MEAS VOLT Or MEAS CURR The power is calculated from the latest voltage and current value When in remote control mode you can send SCPI command to measure MEAS POW Measure max value Operations VFD display 1 Power on the electronic load 2 Select the channel such as channel 1 CH01 CC OFF Vdc 0 0000V Adc 0 0000A Wdcz0 00W 5 Vrange Sel 3 Measure the max value press Shit select Meter Amode Select ress Enter select lt Amode select gt press Enter select Amax Speed press Ente to confirm When in remote control mode you can send SCPI command to measure CURR MAX Range select Operations VFD display 1 Power on the electronic load 2 Select the channel such as channel 1 CH01 CC OFF Vdc 0 0000V Adc 0 0000A Wdc 0 00W 3 IT8700 electronic load have 2 ranges low range 0 18V high Vrange Sel Amode Select range 0 80V Press EP O select lt meter gt press Gi Speed Select range sel s press Ente 1 confirm select your vvanted range such as Low range press ER
67. rstanded in the same way Modules IT8711 118712 have the same menu functions IT8731 118732 IT8732B 18733 118733B 118732 are with the same menu functions The difference is in the range of input voltage current and power Following are the similarities and differences of menu functions between IT8711 s and 118731 s Module IT8711 IT8712 gt Working functions constant current mode CC constant resistance CR constant voltage CV Enable you to set the rising slope and falling slope of current voltage or resistance in dynamic mode dynamic functions has three modes CC CV or CR CV mode has no high and low range selections Dynamic mode up to 25KHZ list mode up to 100KHZ Voltage measuring resolution 0 1mV 0 01mA measuring speed could reach 1KHZ With remote sense function Short circuit function otorage capacity 101 sets List mode enable you to edit a list file in CC CV or CR mode step range 2 255 each step time 0 000001 16383s You can save six list files Autotest function enable you to edit 10 files at most each file will have 10 steps odule IT8731 1T8732 1T8732B IT8733 IT8733B 1T8722 Working functions constant current CC constant resistance CR constant voltage CV constant power CW constant impedance CZ Enable you to set the rising slope and falling slope of current in dynamic mode dynamic functions has one mode CC Dynamic mode up to 25KHZ list mode up to 100KHZ 7 v v VS WV NwWNNNNNN WV Voltage measuring resolution 0 1mV
68. seseaseeeeeeesssseaeeeeeeeeesaaas 14 3 2 INPUT VOLTAGE SELECTION ana ee Ro dolent nica tec nie nee dique eia nea te Ecos obna o die ello 15 3 3 TURN ON CHECKOUT e E 15 3 4 IF THE ELECTRONIC LOAD DOES NOT TURNON e aaa 16 CHAPTER4 TECHNICAL SPECIFICATION nena nn nana eene eene errar nenes 17 4 1 MAIN TECHNICAL PARAMETERS e nana 17 4 2 SUPPLEMENTARY CHARACTERISTICS cesiune isana kaka dd aui E jam qu EDT reU E 22 CHAPTERS PANEL FUNCTION INTRODUCTION 1 e ecco ee eieeeee nennen enhn n nana nn sena a nasa sane nnns 23 INTRODUCTION A A O n eee 23 5 V MAINERAME OPERATION a e 23 5 1 1 Mainframe keyboard functions introduction nvrernnneneennnennennnnenennnnane an nn enne 23 A E NE 25 DS NAME OA e leelo do os 32 5 4 Save and Tec tic lada Pansa os be MS sega 32 5 1 5 Gontiguration ent Modus dse dde c dH ote A ee etii beu redke x des 32 5 1 6 Mod le keyboard IOCK atii ead ote ie dne e d oa lc dapi mt RE 33 5 2 MODULE OPERATION diii caede a een a id e ted let do 33 5 2 1 Single channel module panel e A o ee Ee do eat i te i e x EE 33 5 22 Difal hannel module PANEL xvid rar oS nec Dee ue tus undae Re so dede Pre e Med Su al 34 5 9 VFD INDICATOR FUNC TION DESCRIPTION e ore RS 35 5 46 PIN GONTROLEONNEG TOR aanren e cp 35 9 4 1 External triggsr COMME CTC INS Sweats ecu eub a aina NUM UR 36 5 42 External ON OEFCOControlconneellore sen cp le N 37 5 5 EXTENDED FRAME CONN
69. settin TIGGER TIMER SET Setup the time of the trigger timer Select the port to communicate with a computer RS232 DEFAULT USB TMC USB488 COMMUNICATION ETHERNET RS232 SET BAUDRATE SET Setup the communication baud rate 4800 DEFAULT 9600 38400 57600 PARITY SET Setup the communication parity NONE DEFAULT None parity EVEN ven HANDSHAKE SET Handshake protocol NONE DEFAULT CTS RTS XON XOFF ITI CD GPIB ADDRESS SET Setup communication adress CO GATEWAYSET Gatewaysetng ese Pseig ask set Masksettinig oRTSET SOCKETporseling I O IT EAPAND MODULE Enable this function JOFF lt DEFAULT gt Disable this function ABOUT e A Automatic test menu Press Gui key to enter the menu function Run the testing flie Recall the testing file Edit the testing file EXIT 5 1 3 Channel option There re 3 ways to switch channel 1 Cha number key to switch channel 2 press Chan v key to switch 3 when in SETUP menu you can direcily press the number keys to switch 5 1 4 Save and recall First select the channel to be edited at the main frame front panel after having edited press key to save press 1 numeric key to save to the first goup in location 1 Press key to recall then press key 1 to recall the file saved earlier 5 1 5 Configuration menu introduction Details on each channel menu function For exam
70. ss can be set from O to 31 Press CD ED ko y to enter system menu press XD Rey to find GPIB address set then enter the address and use Ente to confirm The electronic load operates from a GPIB address set from the front panel To set the GPIB address press the lt Shift gt lt System gt key on the pront panel and enter the address using the Enter key The GPIB address is stored in non volatile memory e RS232 interface use a cable with two COM interface DB9 to connect load and PC It can be activated by Shift System key on the front panel NOTE There re two COM interface on the rear panel of 118700 the left 9 pin COM interface is RS232 communication interface the right 9 pin COM serial port connection extended keyboard interface All SCPI commands are available through RS 232 programming The ElA RS 232 standard defines the interconnections between data terminal egueipment DTE and data communications equipment DCE The electronic load is designed to be a DTE It can be connected to another DTE such as a PC COM port through a null modem cable 65 NOTE The RS 232 settings in your program must match the settings specified in the front panel system menu Press Shift lt System gt key if you need to change the settings You can break data transmissions by sending a C or X character string to the multimeter This clears any pending operation and discards any pending output RS 232 data format The RS 232 data is
71. t power discharge circuits and remove external voltage sources before touching components DO NOT SERVICE OR ADJUST ALONE Do not try to do some internal service or adjustment unless another person capable of rendering first aid resuscitation is present Safety Symbols Direct current Alternating current w Both direct and alternating current Y Protective earth ground terminal gt Caution refer to accompanying documents The WARNING sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly performed or adhered to could result in personal injury Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met The CAUTION sign denotes a hazard It calls attention to an operating procedure or the like which if not correctly performed or adhered to could result in damage to or destruction of part or all of the product Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met Introduction IT8700 DC electronic loads are multichannel programmable electronic loads With RS232 GPIB USB EtherNet communication interfaces the series DC electronic loads can provide multi solution according to the requirements of your design and test T8700 DC electronic loads provide you with the flexibility to test a wide range of applications from multi output AC DC power supply DC DC converter charger to power e
72. voltagerange JLOWVRANGE 9 Lowvoltagerange AUTO IAMODE SELECT Select Ammeter mde MEASURE ADX DC current meter MEASURE AMAX Maximum currentmeter__ SPEED jSeletmeteringspeed HIGHACCURARY Highaccurry 0 o Stow 26Hz jSlowsped 20 MEDIUM 172HZ Medium speed FAST 384HZ Fast speed DO JETER STATE 0 ON e A A jenablethefilter function JOFF DEFUALT disable the filter function FILTERMODE Filter mode setting JAVERAGING Averaging mode ADVANCE DEF AVERAGECNT Average ent setting 2100 MI 0 0 0 O PROTECT Load protecting function MAXPOWERSET Setup hardware power protecting JALIMIT STATE Setup software current protecting state Gaudi JOFF DEFAUT Putot 1 1 JAUMITPONT Setup software current protecting value JALIMITDELAY Setup software current protecting delay PLIMITPOINT__ Setup software power protecting value JPLMITDELAY Setup software power protecting delay JONTIMER STATE Setup LOAD ON timer state JONTIMERSET Setup LOAD ON timer time LL ig o o gos o7ooooTTToOT t A FUNCTION MODE Select Mode FIXED Choose fixed operation mode JUST 9 Choose list operation mode

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