IT8817-18 user manual
Contents
1. Chapter1 Inspection and Installation 1 1 Inspection Make sure you have received the following compontents along with unit If anyone has been lost please contact with your franchiser Wen Part Number IT E171 IT E172 you can choose difference power line Power cord according to region User s including installation operation self test manual information Test report test report before ex factory 1 2 cleaning Do not clean any internal parts of units casually If you want to clean the outside cover please use a dry cloth or moistish cloth to wipe N Caution Cut the power source before do the cleaning 1 3 Accessory Standard Accessories Power cord User s manual Calibration testing report 1 4 Installationsite The following outside drawing has marked the dimension information Unit should be fixed in a reasonable size of space and make sure proper ventilation conditions 1 4 1 Mounting Dimensions dimension 465 mmW x 263 5mm H x 535 5mm D Refer to the following dimension drawing T User Manual IT8800 User Manual e t Ge a CH CR CH CRW CR a KC NM ed e Wl ke A Mel Ar Aerm AAA CR CA we d de D el Ee See kk WB Wl i Wd NW ma z d a r Ba e e Ba n mi Em e Ba n E e Ra e kW edy Wei Ta Sei da H aan Ea tan Fr Mr JE le JA ga als h Ni bh ata 4 Ps ae D Ban e 8 ef y i ba WU WOON OO i Minn WM2. 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 om ff e y Kc 9876 RS 232 connector pinout 2 number description no connection no connection RTS readytosend nocomection RS 232 trouble shooting 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 baudrate 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 The interface cable must be connected to the correct serial port on your computer COM1 COM2 etc Communication setting User Manual 42 Before communication operation please make sure that the following parameters of electronic load match that of PC Baud rat
3. UNI PINO MIN HM WOU WOU HOM GG REAR LOOK Unit minimeter mm 1 4 2 Input connections Power Cord Connect the power cord to the IEC 320 connector on the rear of the unit If the wrong power cord was shipped with your unit contact your nearest Agent to obtain the correct cord See following figure for the part number and ordering options D ty 3 China United States Canada Europe United Kingdom IT E171 IT E172 IT E173 IT E174 User Manual 8 kel ECH 118800 User Manual Chapter 2 Quick Start 2 1 Power on selftest 2 1 1 Introduction A successful test process indicates that units meet the factory specifications and can be operated well 2 1 2 Selftest steps Power cord should be connected correctly Following is the detailed selftest steps VFD display Explanations RUE eler ne BOIS Ver 1 10 display software version About 1S later System Selftest System self check VFD the first line display actual voltage and current value 0 0000V 0 0000A VFD the second line display the actual 0 00W CC 0 000A power value and the setting current voltage power resistance impedance value About 1S later Em Model IT88XX Display products s information You can Press Ver 1 XX 1 XX press direction buttons to check product s SN XXXXXXXXXXXXXXXXXX model SN software version number 7 N WARNING The electronic load is shipped from factory with a power cord that has a plug appropriate for your location
4. e Sr L Input terminal impedence 15 User Manual Model IT8817C IT8818C Voltage 0 120V 0 120V 0 600A 0 600A 0 72A 0 720A 2200 LD Rated value power 4500W 0 40 C Minimum setting 0 18V 60A 1 8V 600A 0 18V 72A 1 8V 720A gg range 0 18V 0 120V 0 18V 0 120V CV mode 0 0 0 025 0 05 FS 0 025 0 05 FS H aar 05 0 025 0 05 FS 0 60A 0 600A 0 72A 0 720A 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 010 100 10Q 7 5KO 0 0050 100 10Q 7 5KO CR mode resolution 16bit 16bit ss CW mode Measurement range 0 18V 0 120V 0 18V 0 120V oltage rer 0 025 0 025 FS 0 025 0 025 F 0 025 0 025 0 025 0 025 FS Accuracy S FS 0 60A 0 600A 0 72A 0 720A current 0 05 0 1 FS 0 05 0 1 FS Ee EK A POE 100mW 100mW power n 0 2 0 2 FS 0 2 0 2 FS Protection range OPP 5480W gt 6050W ocp 998 BAT 5792A 5792A OP EA 130V A specification current o Z Ss CC incl ee voltage CV resistanc E n y 8 e CR cialis Input terminal 300KO 300KO impedence User Manual 16 3 2 Supplementary characteristic Memory capacity 100 groups Suggested calibration frequency 1time year AC power input scale selectable by switch on the rear panel Option Opt 1 220V 10 50Hz 60Hz Option Opt 2 110V 10 50Hz 60Hz Cooling method Fans Fan control temperature Operating temperature 0 to 40 C Stora
5. User Manual 18 Load ir Setting current current Load input voltage V CC mode Figure 4 1 CC mode 4 2 2 Constant voltage mode CV In this mode the electronic load will attempt to sink enough current to control the source voltage to the programmed value See figure 4 2 V Setting Load voltage input voltage Load current CV mode Figure 4 2 CV mode 4 2 3 Constant resistance mode CR 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 4 3 Slope Pr Resistance Load input voltage CR mode Figure 4 3 CR mode 19 User Manual ECH IT8800 User Manual 4 2 4 Constant power mode CW In this mode the electronic load was equivalent to a constant power as shown below As the input voltage increase the current value will decrease See figure 4 4 Setting power Load current CW mode Figure4 4 CW mode 4 3 Input Control 4 3 1 Input switch operation You can control the On Off state via pressing the EMBbutton when AD buttonis lit that means the input is opened when GEWbutton is lighted the input is off If input have been opened indicator lamp off on the VFD display would be dark 4 3 2 Short operation The load can simulate a short circuit at its input You can press EM number 1 to switch to short state in local operation mode operate with pron
6. When the power supply s voltage fall and is lower than Von unload value input is turned off LOAD SINE CURRENT RISE RATE Aus E VON LATCH state load working mode User Manual 26 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 4 11 OCP test function OCP test process When the input voltage has reached Von point current will begin to work after a delay time The current value will increase by a step size at regular intervals Simultaneously unit will judge whether the input voltage is lower than OCP voltage you need to set If it is then the present current value will be compared to see if it is in the current range you ve set Within this range the test will Pass or will Fault On the contrary the current will continue to increase within the cut off current range And then compare OCP voltage with input voltage too Press key Trig to start OCP Press key UL ACC OCP to enter OCP test function setup interface Run OCP test file OCP TEST Recall Recall OCP File 1 Recall OCP test file 1 5 OCP TEST 1 Voltage on level 0 000V Set Von value 2 Voltage on Delay 0 00S Set voltage on delay time 3 Current Range 0 000A Set current range 4 12 OPP test function OCP test process When the input voltage has reached Von point power will begi
7. 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 CAUTION 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 products Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met 9 User Manual Introduction T8800 series DC electronic loads are singel channel programmable electronic loads With RS232 GPIB USB communication interfaces The series DC electronic loads can provide multiple solutions according to the requirements of your design and test Feature e Highlight VFD display e Measurement resolution 0 1mV 0 01mA e Measurement speed up to SOKHZ e Four operation mode CV Constant Voltage CC CR CW e Rotary knob making the operation more easier e Remote Sense function e Battery test function e Memory capacity to save recall setting parameters 100 sets e Short circuit function e With skid resistant tripod and portable firm chassis e Controlled by intelligent fans e Build in Buzzer as alarm signal e Power off memory function Model Voltage Current Power 118818 120V 480A 6000W 118818B 500V 150A 5000W IT8818C 120V User Manual 6
8. directly press GD key to confirm 3 In constant resistance mode Dress CV Setup to set according to the steps below Steps Operation details VFD display Constant Resistance 1 Press CR key press CV to enter the Range 7500 00 parameter setup interface Set the max working resistance press GB Constant Resistance to confirm Range 20 3 Set the upper voltage level press GZEDto Constant Resistance confirm High 130 0V 4 Set the lower limit of voltage press GSD to Constant Resistance confirm Low 0 000V 10 0000V 0 0000A 9 All finished 0 00w CC 2 0000 5 2 Transient test operation Transient operation enables the load to periodically switch between two levels Here we take the example of CC mode For example A B setting value is 1A and 2A The output voltage of power supply Is 10V 3A User Manual 34 5 2 1 Transient test operation in continuous mode We can set the transient operation parameters and then run transient test EE es A details VFD display 1 press press TRANSIMON Sa Use direction key to move to On and select Continuous press EMB to confirm the Continuous Pulse Trig indicater lamp on VFD will then be lit Toggle 3 Leena press HEI confirm High Rate Low Rate move to High Rate press Ei to confirm High Rate Low Rate confirm Rise up 30 000A uS Rise downed confirm Rise down 30 000A uS l TRANSITION TRANSITION TRANSITION Set the frenquency press amp to conf
9. this function you should first enable this function in the menu the operation IS 1 Press EM number 6 into the menu 2 VFD displays gt CONFIG press GED key to confirm 3 Press direction key to choose gt REMOTE SENSE press GED key to confirm 4 Press direction key to choose gt ON press GED key to confirm And the remote sense function has been set Wiring diagram for remote sense nput port in front pane me Es Sense port in rear pane YU 4 16 2 External trigger operation Before take the rear panel trigger way please set the trigger source as EXTERNAL first trigger signal will input from the TRIG pin of the rear panel 31 User Manual When you choose external trigger mode trigger signal should be connected to TRIG and ground pins 4 16 3 External Analogue Control You can control the voltage and current setting of the electronic load by the analogue terminals EXT and PRG 0 10V adjustable analogue simulate the 0 fullscale to regulate the input voltage and current of the electronic load 10V indicate the full range of load voltage or current value 4 16 4 Voltage Failure Indication When the load is under OVP or reverse protection condition pin 2 VF will output high level signal 4 16 5 Current monitoring I Monitor 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 an oscilloscope to displa
10. 5 NES Enable transient test use direction key to TRANSITION move to On press EMB to confirm On Off Then the VFD will display TRAN 10 0000V 0 0000A 0 00W 0OTRAN Press On Off button to On then press A B value will switch Trig every time when there is 11 trigger signal received the running time will display at the lower right corner press Esc button will quit the transient test if you want to continue the test ie again please repeat 1 11 steps 5 2 3 Transient test operation in Toggled mode We can press to set the transient test parameter and run the test Steps Operation details VFD display Tran TRANSITION 1 Pont Use direction key to move to Toggle press TRANSITION 2 GED io confirm the Trig indicator lamp on Continuous Pulse the VED will be lit Toggle Use direction key to move and to select the TRANSITION high low Rate move to High Rate press High Rate Low Rate to confirm Rise up 30 000A uS E ts Setalevelpress Guo conim Jazz pet EN KM Enable transient test use direction key to TRANSITION move to On press EMB to confirm On Off Then the VFD will display TRAN 10 0000V 0 0000A 0 00W 0 TRAN Press On Off button to On then press A B value will switch to B A every time when User Manual 36 there is trigger signal received the running time will display at the lower right corner press Esc button will quit the transient test if you w
11. A set all the parameter press EN number 4 and then 9 3949V 0 99994A 5 89W SAVE 9 9 to save data to file 9 2 Press key GD to confirm 5 8949V 0 99994A 5 89W cc 1 000A RECALL 1 Press key GEEZ press number 9 recall from 9 file ro 0 99994A to recall the data that is saved in the memory 89W cc 1 000A Note You should combine the Memory function in the system menu with Recall function to help you recall the saved parameters Memory function When you want to recall the data saved in the memory you should set the memory group in the system menu first Group means you can recall datas saved in 0 10 groups Group1 means you can recall datas saved in 11 20 groups Group2 Group9 can be concluded in the same manner 4 10 VON function Press number 9 to enter configure menu 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 29 User Manual There is two types of Von working modes Living and Latch When you select Living that means working in living state when you select Latch it means working in latch state when the voltage reach the Von point LOAD SINE CURRENT VON LIVING state load working mode When enable LIVING mode as voltage rise and is higher than the Von loading voltage input of electronic load is turned on
12. ATION 0 000 eee ec ec eceeeeeeeeeeeeeeaeaeeeaeaeaeaeas 14 3 1 MAIN TECHNICAL SPECIEICATION nn nnnen nn rra nr nrnenrn rra na nrnenrnrnnnnnnes 14 3 2 SUPPLEMENTARY CHARACTERISTI nene nene nn nene nenenenenanananes 17 CHAPTER4 FUNCTION AND CHARACTERIGIIC 18 4 1LOCAL REMOTE OPERATION MODE ececececececececeeeeeeeeeeeeeeeaeeeeeeaeaeaeaeaeeaeaeaeaeaeaeas 18 4 2 OPERATION MODES rn 18 4 2 1Constant current mode CC 18 4 2 2 Constant voltage mode CV summene saehenekdserdsakknesbekedededan 19 4 2 3 Constant resistance mode Ch 19 4 2 4 Constant power mode CW 20 ES SS O a 20 TN NN 20 Bo o PPP PR EE EE 20 4 4 SYSTEM MENU SYSTEM cccsccceccecececcecceecceccesccecceceaeececceceueeceeeauececceseneeeeseaeeeesaes 20 4 5 CONFIG MENU CONFIG cccsccceccecececcececcececceccceecuceuceceeceueueeceeeaueceeeeseuueteseaeesaneaes 21 4 O WRG RFI IN 23 4 6 1 TRIGGER FUNCTION cc eee 23 4 6 2 TRIGGER SOURCE erg 23 4 7 A B TRANSIENT OPBERATIONS rn rr nrnrnnnne 23 4 7 1 Continuous mode Continuous oocoocnccccccncnncnncnnncnconcnnnonnnnnnncnnnnnnnnnncnrnnnnnns 23 4 7 2 Pulse mode Dusel 24 4 7 3 Toggled mode Togodledt 24 AO LIGT OPERATION SSP 24 4 9 SAVE AND RECALL EUNCTION cn rr nan rrnrrrnnnne 25 AV MN 25 4 11 OCP TEST UN e rr rs er rn 27 User Manual 2 A12 emake k We UNO TON nn 2 4 13 BATTERY DISCHARGING TEST en 28 4 14 PROTECTION FUNCTIONS c ccececceceeececececeeeeeeeeeececeaeaeaeaeeceeeaeaeaea
13. IT8800 User Manual User s Manual DC programmable electronic load Model 1T8817 IT8817B IT8817C IT8818 IT8818B IT8818C LE LT LE LN nN ee eee pn ARA eS eem Ca sie ze ES mer ee ee em rr pn e mn rn re Term Em rem ee ze eme E Fe en a a e me Fe Een ee A rer U Em E Fe en e Rm en Lem ee eee SS EE ER E E EE EN ee es Fr Fe en o T EE er EH EE EE DEET TET WEEN A EEE mge mn aT rm remm mn remm Fr mn mm Cen 2 pen mn ms rm mem Fe ET ro mmm res Pe zm pm men mn A re me Em men ee Fe A 20002000 e mm Em pn rm E 1 mn zm EEE GE EEE rm rm pm SSS Ee EE oe EE PECH Fe A ME e Fee ee A me o mm Copyright 2010 All Right Reserved Ver1 2 Oct 2013 IT8800 701 User Manual DIRECTOTRY CHAPTER1 INSPECTION ANDINGSTIALLATION cececececececeeeseenenenees T TTN PENN T TENNE T la ACCESSORY E T NNN T 14 1 Mounting DIMENSIONS E 7 1 4 2 INPUT CONNECTIONS eee 8 CHAPTER 2 QUICRKSTAR Lats 9 2 Be el TE a eo Ce 9 Za Es E ang e Penn e e o A 9 ASEO E 9 2 1 3 If the electronic load can t power on occocccoccoccccccoccocccononcoconcnnoonocanonronononnnnnonanos 9 2 2 FRONT PANEL INTRODUCTION 0 ecececececeeeecececececeaeaeaeececeeeaeaeaeaeeceeeeeaeaeaeeenseneeentatans 10 2 FERNER DUNN 11 2 4 VFD STATUS INDICATOR LAMP DESCHRIRTION 12 2 5 KEY BOARD DESCRIP NON EE 12 2 6 COMBINATION KEYS resicarasonsanicasa ici canicas 13 CHAPTER3 TECHNICAL SPECIFIC
14. Your electronic load is equipped with 3 wire grounding type power cord the third conductor being grounded 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 2 1 3 If the electronic load can t power on The following means could help you solve some problems you may meet when you turn on the units 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 its not correct 3 Verify that the correct power line fuse is installed 9 User Manual If fuse is blowout please replace it according to the following specification Model Fuse specification 110AC Fuse specification 220AC IT8817 T 5A 250VAC T 2 5A 250VAC IT8817B T 5A 250VAC T 2 5A 250VAC 4 The method to replace fuse Use a flat bladed screwdriver to open the small plastic cover under the AC input connector on the rear panel of the load then you can see the fuse Please use the match
15. accumulator Press key STOP Condition Voltage Stop Voltage Set the cut off voltage STOP STOP Condition CONDITION SES Stop Capability Set the cut off capacity STOP Condition STOP Condition S Hu Stop Timer Set the discharge time Operation 1 Press key EME to turn off the load connect the battery to be tested press SUL number 3 in CC mode to enter the battery discharging function menu select one of the 3 testing means SG to your test demands 2 For the first means press key lt ul number 3 select Capability Press key EL VFD display Stop Capability Ah set the cut off capacity press key GED to confirm when the capacity falls to the value set the load will auto turn to input off state User Manual 28 3 For the second means press key EH number 3 select Voltage press key GED VFD will display Stop Voltage V set the cut off voltage press key EI to start the battery test When the battery voltage falls to the cut off voltage the load will auto turn off the input 4 For the third means press number 3 select Timer press ED key VFD display Stop Timer S set the discharging time the load will automatically turn off after the setting time 5 Press key to start to test 6 Press ESC quit the battery test mode 4 14 Protection Functions Load has the following protection functions over voltage protection OVP over current protection OCP over power p
16. ant to continue the test again please repeat 1 10 steps 5 3 List operation Before run a list file you should edit the list file firstly and save it in a non volatile memory The following examples will help you understand the function well Example the supply output to be tested is 10V current 3A and the load is in CC mode Trigger 01 2 34 5 List count 1 gt 4 List count 2 gt List sequence The steps Steps Operation details VFD display Press LIST 1 Po we Edt Use direction key to move to Edit press EDIT LIST GP to confirm High Rate Low Rate Use direction key to move to High Rate EDIT LIST press EMB to confirm Current Range 3A Set the list step by pressing the numeric EDIT LIST key for example if you just want 2 steps just File Step 2 2 84 press key 2 press Eiter to confirm 5 Edit the current of the first step press GB EDIT LIST to confirm Step 001 Level 1A Edit the slope of the first step Dress Eito cod ech ue Rate 0 1A uS 7 Edit the time width for the first step press EDIT LIST GSP to confirm Step 001 Width 5S Edit the current of the second step press EDIT LIST GED to confirm Step 002 Level 2A EN Edit the slope of the second step press EDIT LIST Step 002 Enter to confirm Rate 0 1A uS 37 User Manual Edit the time width of the second step press EDIT LIST 10 Go confirm Step 002 Width 5S EE dn Ben Save the file edited to a
17. cording to the steps below Steps Operation details VFD display Constant Voltage 1 Press CV button then press Range 120 00V CV setup enter the parameter setup interface Set the max working voltage press G9 to Constant Voltage confirm Range 2 33V 3 Set the upper limit of current presss Eto Constant Voltage confirm High 66 000A 4 Set the lower limit of the current press GZEDto Constant Voltage confirm Low 0 0000A D 10 0000V 0 0000A AGNE 0 00W CV 2 33V 33 User Manual 5 1 3 Constant power CW There are three means to change the power 1 In constant power mode rotate Rotary SW 2 In contant power mode press numeric keys to set the power directly press Ei key to confirm 3 In constant power mode press CV Setup to set according to the steps below Steps Operation details VFD display Constant Power 1 Press CW key press CV to enter the Range 400 00W parameter setup interface Set the max working power press ito Constant Power confirm Range 1 00W 3 Set the upper voltage level press SU r Constant Power confirm High 130 00V 4 Set the lower limit of voltage press GED to Constant Power confirm Low 0 000V me 10 0000V 0 0000A pene 0 00W CW 1 00W 5 1 4 Constant resistance CR allowed setting range refer to the Technical Specification There are three means to change the resistance 1 In constant resistance mode rotate Rotary SW 2 In contant resistance mode press numeric keys to set the resistance
18. d 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 disconnect 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 N Alternating current Both direct and alternating current Protective earth ground terminal Caution refer to accompanying documents WARNING The WARNING sign denotes a hazard It
19. e 9600 4800 9600 19200 38400 57600 115200 You can enter system menu through panel to set communication baud rate 1 Data bit 8 2 Stop bit 1 3 Parity none even odd EVEN eight data bits with even parity ODD eight 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 Stop Bit 6 2 USB interface use cables with double USB interface to connect load and PC All electronic load functions are programmable over the USB The USB488 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 6 3 GPIB interface First conncet GPIB port of load to GPIB card of PC with IEEE488 BUS They must be sufficient contact and tighten the screws And then set address The address can be set from 0 to 31 Press 9 number 5 to enter system menu press 2 key to find Communication select GPIB and then set the GPIB address and use GiBto confirm The electronic load operates from a GPIB address s
20. eeeneeseaeaneeeenensnnees 29 4 14 1 OVER VOLTAGE PROTECTION OVP i rmnrnnnnnnnnnnnnnnnnrnnnnennnnnnnnnennnennennnerneennnnee 29 4 14 2 OVER CURRENT PROTECTION LOCH 29 4 14 3 OVER POWER PROTECTION OPP 30 4 14 4 OVER TEMPERATURE PROTECTION OTI 30 4 14 5 REVERSE VOLTAGE PROTECTION LR 30 4 15 KEY LocCkEUNGCTION nes 31 4 16 REAR PANEL INTERFACES INTRODUCTION ecececececeeeeeecececececeavaveeeceeeetaeaeeeeenensnaees 31 4 16 1 REMOTE SENSE FUNCTION cccececececececeeeeeececececeeeaeaeececeeeataeaeateteseaeatatavenenaees 31 4 16 2 EXTERNAL TRIGGER OPERATION rununnnnnnnnnnnvnnnnnnnnennnvnnennnenenennnvenenenenenennnnnnnnnnnne 31 4 16 3 EXTERNAL ANALOGUE CONTROL sannnnnnnnnnnnnnnnnnnnnnnnnnnnnnennnnnenenennnnnennnenenenenenenennn 32 4 16 4 VOLTAGE FAILURE INDICATION ranunannnnnnnnnnnnnnnnennnennnnnnennnenenennevennnnnnnenennnnnnnnennne 32 4 16 5 CURRENT MONITORING I MONITOR ecceeccecececececeeeeeeeecaeseeceneeueeeueeeaeeeneeeaes 32 CHAPTERS OPERATION INTRODUCTIONS aunnnnvnnnnnnnnnnnnnnnnnnnnnnnnnenenennnenenenenenennnnnenenenenenennn 33 O OPE ATION MODES senssoss sa aaa sete meee 33 5 1 1 Constant current CC 33 9 12 GONSiant Valla e E EE 33 Or lao CONS tat DOW Cl EE 34 5 1 4 Constant resistance Ch 34 5 2 TRANSIENT TEST OPERATIONS 34 5 2 1 Transient test operation in CONTINUOUS mode rrrarvarrnrnernnvnrvrrernennsnnernenuenee 35 5 2 2 Transient test operation in pulse mode 35 5 2 3 Transient test operation in To
21. ely 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 you can disconnect the power supply via this signal User Manual 30 Operations to clear the reverse voltage state Check whether the connection is reversed if so disconnect the object to be meaured 4 15 Key Lock Function Press number 8 key to lock the front panel keys VFD will display lable In this state setting values can not be modified woriking mode can not be changed press lt i number 8 key again will disable this function 4 16 rear panel interfaces introduction 4 16 1 Remote sense function When work in CC CV CR and CP mode if load consumes biggish current it will Cause one depressed voltage in the connection line between tested machine and terminals of Load In order to assure testing precision Load provides one remote testing terminals in the rear panel Users could test the output terminals voltage of tested machine through it Users should set the Load in REMOTE mode before using the function Remote Sensing SENSE 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 Before you use
22. et from the front panel The GPIB address is stored in non volatile memory When communicating with PC you can just select one method of all the communication methods above 43 User Manual Support process If you have a problem follow these steps 1 Check the documentation that come with the product 2 Visit the ITECH online service Web site is www itechate com ITECH is avaliable to all ITECH customers It is the fastest source for up to date product information and expert assistance and includes the following features Fast access to email AE Software and driver updates for the product Call ITECH support line 4006 025 000 ALLA User Manual 44
23. 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 maximum relative humidity of 95 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 User Manual 4 Ground the Instrument This product is a Safety Class 1 instrument provided with a protective earth terminal To minimize shock hazard the instrument chassis an
24. ge temperature 20 to 70 C Humidity Indoor use humidity lt 80 17 User Manual Chapter4 Function and Characteristic We will introduce the functions and characteristics of EL completly in this chapter from several parts Local remote operation mode switching Constant operation modes Input control System menu Config menu Trigger function Dynamic test function List operation Save Recall function VON function OGP test function OPP test function Battery test function Protection function Key lock function Terminal on rear panel 4 1Local Remote operation mode The electronic load provides two control mode Local mode and remote mode which can be switched by Local key on the front panel or SCPI command 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 through computer via the GPIB RS232 USB or Ether Net interface in local mode all the buttons on front panel can be used In remote control mode the keys can not work 4 2 Operation modes The electronic load can be operated in the following five modes 1 constant current mode CC 2 constant voltage mode CV 3 constant resistance mode CR 4 constant power mode CW 4 2 1Constant current mode CC In this mode the electronic load will sink a constant current in accordance with the programmed value regardless of the input voltage See figure4 1
25. ggled mode 36 TOP NG 37 5 4 AUTOMATIC TESTING FUNCTION EE 38 CHAPTER 6 COMMUNICATION INTERFACE 41 OTRS 2 NIE FACE EE 41 JE TE 43 6 3 GPIB INTERFACE nannnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnennnsnen 43 3 User Manual Warranty Information Certification We certify that this product met 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 IT8800 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 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
26. ing fuse figure shows the fuse location rear lock 2 2 Front panel introduction User Manual 10 1 The power switch 2 VFD display 3 Rotary knob Operation mode CC CV CR CW keys 5 Direction buttons 6 Function keys Number keys Composite function keys 2 3 Rear panel introduction 6 E BE Cie e e SCHU TA Ol ol GG NIE SS ND En h kir Hre i 1 Input terminal Current detection terminal 3 Remote sense terminal external trigger terminals 0 10V anolog control interfaces External signal control interface D RS232 communication interface USB communication interface GPIB communication interface AC power switching 110V 220V AC power input socket with fuse in it Fans 11 User Manual 2 4 VFD status indicator lamp description OFF The load is in OFF state Error Something wrong happened CC Constant current mode Trig Waiting for the trigger signal CV Constant voltage mode Remote sense function is enabled CR Constant resistance mode Prot Software OCP state cw Constant power mode Rear GI analog control function is open Remote control mode Auto Voltage range automatically seleting function is open Addr Eee e The key lock function is open control mode d SRQ Serial request enquire shift Shift has been pressed 2 5 Key board description ITE CH Programmable OC Electronic Load Shift composite key Recall Recall parameters that have been saved such as cur
27. irm Frequnce 50Hz 0 01 25000Hz TRANSITION o set the Set the dutyfactor press Eto confirm Press Set the dutyfactor press Eto confirm confirm Duty 98 0 1 99 9 Enable the transient test function use TRANSITION 10 direction key to move to On press GZEDto On Off confirm Then the VFD will display TRAN 10 0000V 0 0000A 0 00W 0 TRAN Press On Off button to On then press A B value will switch continuously the running time will display at the lower right corner press Esc button will quit the transient test if you want to continue the test again please repeat 1 12 steps 5 2 2 Transient test operation in pulse mode We can press to set the transient test parameter and run the test Steps Operation details VFD display TRANSITION ES On Off Use direction key to move to Pulse press TRANSITION EP to confirm the Trig indicator lamp on Continuous Pulse the VFD will be lit Toggle Use direction key to move and to select the TRANSITION high low Rate move to High Rate press High Rate Low Rate Enter to confirm Set the rising slope press EMB to confirm TRANSITION Rise up 30 000A uS User Manual TRANSITION Set the fall slope press Eio confirm Rise down 30 000A uS TRANSITION 6 Set A level press GZE9to confirm eer TRANSITION 7 Set B level press ELE to confirm Wees e TRANSITION Set the time width press EMB to confirm Pulse Width 5S 0 00002 3600
28. isplay PRGO1 PRG01 STOP Press 5 If you need a pause please press Pause Push the down arrow can continue the testing file User Manual 40 Chapter 6 communication interfaces There are three kinds of communication interfaces for 118800 GPIB USB RS232 You can choose any one of them to communicate with PC 6 1 RS232 interface use a cable with two COM interface DB9 to connect load and PC It can be activated by number 5 Note There re two COM interfaces on the rear panel of I T8800 the above 9 pin COM interface is RS232 communication interface the below 9 pin COM is 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 equeipment 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 Note The RS 232 settings in your program must match the settings specified in the front panel system menu Press number 5 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 a 10 bit word with one start bit and one stop bit The number of start and stop bits is not programmable However the following par
29. ity options are selectable in the menu using the frongt panel number 5 Parity options are stored in non volatile memory Baudrate The front panel Se number 5 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 number 5 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 41 User Manual h l E 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 characters until it sees an X ON IT8800 User Manual NONE There s no flow control Flow control options are stored in non volatile memory
30. m 9 by EDIT LIST pressing numeric key press GSD to confirm Save List File 1 1 9 Use direction key to move to On press 13 GSD to confirm then the Trig indicator LIST lamp on the VFD will be lit press Esc key On Recall Edit will exit the settings ent On Off to On press to List test will run rigger 15 Press Esc to exit the test if you need to exit the list test Note if you want to run a list file you ve saved please recall it firstly The steps is to press MEE after you enter the List menu move the direction key to select Recall Press EISD button to confirm 5 4 Automatic Testing Function Automatic test function of 118800 series electronic load is very powerful it can simulate various test lt can edit up to 10 groups of testing files each file has 10 steps it can edit up to 100 files which can be saved in EEPROM address Edit a automatical test file VFD display PROGRAM gt Press direction key to move menu to gt EDIT PROGRAM EDIT PROGRAM to edit testing files Active Sequence 0987654321 Select the steps needed to test if you EDIT PROGRAM want to test 4 steps please press in Active Sequence 09876543XX order 1 2 3 4 O stands for the tenth step If you want to cancel a step press again the numeric keys you want to cancel Press GSD to confirm In the 4 steps if you want to suspend EDIT PROGRAM e g you want to suspend step 2 press Pause Sequence nnn
31. mit 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 4 14 4 Over Temperature Protection OTP Each module has an over temperature 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 4 14 5 Reverse voltage protection LRV This function protects the load module in case the input DC voltage lines are connected with wrong polarity Once in reverse connection condition input will be immediat
32. n STATE Enable this function Disable the function EXTNAL PROGRAM Extenal analog signal function Enable external 0 10V analog signal control function On Disale external 0 10V analog signal Off control function 22 A Limit P Limit Time 4 6 Trigger function 4 6 1 Trigger function Trigger operation can be used in the following operations transient pulse 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 4 6 2 Trigger source keyboard GED key trigger when the keyboard trigger mode is active press GED will enable a trigger operation 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 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 electronic load 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 operati
33. n to work after a delay time The power value will increase by a step size at regular intervals Simultaneously unit will judge wether the input voltage is lower than OPP voltage you need to set If it is then the present current value will be compared to see if it is within the current range you ve set Within this range the test will Pass or will Fault On the contrary the current will continue to increase within the cut off current range And then compare OPP voltage with input voltage too Press key Trig to start OPP test Press key ili cw OPP to enter the OPP function test setup interface 27 User Manual OPP TEST Run 7 Run OPP test file OPP TEST Recall TAE i Recall OPP File 1 Recall OPP test file 1 5 OPP TEST OPP TEST 5 Step Power 0 000W Set the step power value Save OPP test file 4 13 Battery discharging test Capacity test Electronic load uses CC mode to do the capability test Make a program to set the voltage in off state The accumulator have too low voltage electronic load intermits test if system checks the accumulator which is near to one rating or in insecurity state In testing procedure you could see the accumulator voltage discharge current discharge time and spare capability of accumulator If connecting with PC software discharge curve could be displayed in window This test can reflect the reliability and using time of accumulator So it s necessary to do the test before you change another new
34. ncnnccXX numeric key 2 press amp to confirm Edit the 1 step of the 2 steps EDIT PROGRAM determine whether need short circuit Short testing for example if step2 needs Sequence nnnnnonnXX short circuit testing press number 2 press amp to confirm User Manual 38 Set with load time if you want to load EDIT PROGRAM e 2S press numeric key 2 then press SEQ01 On Time 2S GSD to confirm Set unloading time if you need 2S EDIT PROGRAM press numeric key 2 then press SEQ01 Off Time 2S GED to confirm e Set testing delay time e g 1S press EDIT PROGRAM numeric key 1 SEQ01 P F Delay Time 1S Tpf is testing delay time Set with load time of the second step if EDIT PROGRAM you want to load 2S press numeric key SEQ02 On Time 25 2 then press Gi to confirm Set unloading time of the second step if EDIT PROGRAM 10 you need 2S press numeric key 2 then SEQ02 Off Time 2S press amp to confirm Set testing delay time of the second EDIT PROGRAM step e g 1S press numeric key 1 Tpf is testing delay time SEGUTe SEQ Z 0 SCHU To nt T ot Tpf is test delay time Set the condition when stop testing PROGRAM COMPLETE mean stop test When all the Complete Stop Failure Stop steps are completed FAILURE mean stop test when the testing fails press GD key to confirm Whether you need to link to the next file to PROGRAM be tested if you need to link to group 2 Chain Program File 0 0 10 press numbe
35. nt operation Toggled Transient Operation TRG TRG 4 8 List operation LIST List mode lets you generate complex sequences of input changes with rapid precise timing which may be synchronized with internal or external signals This is useful when running test sequences with a minimum amount of overhead Generate complex sequences to complete complex tests by editing LIST Select 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 max 2 84 single step width time 0 00002s 36005 and every step s set value and slew rate The list file can be saved in non volatile memory used to fast recall Users can edit up to 7 groups list file In list operation mode the load begin to enable the list operation once receive the trigger signal until the list operation is completed or the instrument receive another trigger signal User Manual 24 Trigger 01 2 34 5 lt List count 1 gt 4 List count 2 gt List sequence 4 9 Save and recall function We can save some often used parameters in the non volatile memory the parameters includes working mode voltage current value and so on The memory capacity is 100 groups You can use SAVE key to save parameters press key to fast recall Save and recall operation For example the voltage provided is 6V and the load works in CC 1A VFD display SAVE CA
36. oF 0 025 gg ls 0 36A 0 360A 0 48A 0 480A current n 0 05 0 05 FS 0 05 0 05 FS Readback voltage H 4500W 100mW 100mW 0 2 0 2 FS 0 2 0 2 FS Protection range OPP gt 4550W 6050W 39 6A 396A 52 8A 528A 130V 130V specification current S A CC 39 6A 396A 52 8A 528A voltage CV resistanc 4 o 2 e CR Input 300KQ 300KO User Manual terminal mpedenes Model IT8817B IT8818B Voltage 0 500V 0 500V 0 12A 0 120A 0 15A 0 150A ST E TI Rated value power 36KW 0 40 C Minimum setting 0 3V 12A 3V 120A 0 3V 15A 3V 150A ry range 0 50V 0 500V 0 50V 0 500V CV mode mv O o 0 0 O 0 025 0 05 FS 0 025 E Ur avi n mme OS F 0 025 0 05 FS 0 12A 0 T 0 SC 0 150A CC mode 0 05 0 05 FS 0 05 0 05 FS 0 05 0 05 FS 0 05 0 05 FS 0 030 100 10Q 7 5KO 0 030 100 100 7 5KQ CR mode resolution 16bit 16bit A AA CW mode Measurement range 0 50V 0 500V 0 50V 0 500V oltage r 0 025 0 025 FS 0 025 0 025 0 025 0 025 F 0 025 0 025 FS Accuracy FS S 0 12A 0 120A 0 15A 0 150A current n 0 05 0 05 FS 0 05 0 05 FS 36KW Readback Resolutio 100mW 100W power n 0 2 0 2 FS 0 2 0 2 FS Protection range opp 3650W 5050W oCh 13 2A 132A 16 5A 165A OVP 530V 530v Ko ET BB specification current 7 o n CC 13 2A 132A 16 5A 165A voltage resistanc
37. on 4 7 A B transient operations Transient operation enables the module to periodically switch between two load levels as might be required for testing power supplies dynamic property We can enter the transient operation menu from the front panel by key before you turn on the operation you should set the parameters associated with transient operation 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 4 7 1 Continuous mode Continuous Under the continuous mode when the transient test is turned on the load will continuously switch between the A B levels preset Continuous Transient Operation 23 User Manual 4 7 2 Pulse mode Pulse 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 level after maintaining A width time then it will switch to B level it won t swith to level until the the instrument receive the pulse signal The following picture show the current waveform in pulse transient operation TWD TWD me gt E E EEN TRIG TRIG Pulsed Transient Operation 4 7 3 Toggled mode 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 transie
38. r key 2 0 stands for not linking to other files Press GE key to confirm za Sequence Save Group 1 PROGRAM 2 1 39 User Manual Sequence 20 rr 2 E EL A E PROGRAM 1 10 Sequence Save the edited files in EEPROM you can PROGRAM save up to 10 groups of files e g please Save Program File 1 1 10 press numeric key 1 to save the edited file in group 1 and then press amp to confirm Press ESC key to exit Select a operation mode and then press 10 0000V 0 0000A E CV setup to set related parameters 0 00W CC 1 000A for example the first step functions in CC mode current setting value is 2A the upper voltage limitation is 10V the lower limitation is 2V the second step works in CV mode setting voltage value is 3V and the upper current limitation is BA and the lower current limitation is OA After all the steps are set OK Press ESC key to exit setup and then press number key 4 to save Pp You need to recall the auto test file before runing it Recall testing files The following way can make you fast recall the edited testing files from EEPROM after re powering Steps operations VFD display PROGRAM ES EENEG Run Recall Edit Press direction keys to move to lt RECALL RECALL PROGRAM 2 PROGRAM to recall the saved testing Recall Program File 1 files press to confirm 3 Press direction keys to move to lt RUN PROGRAM PROGRAM and then confirm Run Recall Edit 4 D
39. re 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 software OCP users can set load s software OCP value steps ETD number 5 gt Protect gt Alimit set ON Apoint set OCP current value Adelay set delay time before 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 29 User Manual 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 command PROTection CLEar the OCP displayed on the front panel will disappear load exits OCP protection state 4 14 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 condition occur software OPP users can set load s software OPP value steps END number 5 gt Protect gt Point set OPP power value Pli
40. rent setting value an GED set the dynamic test parameters GED Trigger button open trigger function GED set the parameters of List test file Pause if needed during auto test Select constant current mdoe set current level Select constant voltage mode set the voltage level CD Select constant resistance mode set the resistance value User Manual 12 ve value mode Left arrow move the cursor to the right when in set mode Confirm button number keys SL 2 6 Combination keys number1 Short start or stop short test function number 2 pragma Auto test function number 3 Battery Battery test function number 4 Save Save the current setting value such as current setting value number 5 System menu setting System 13 User Manual ECH IT8800 User Manual Chapter3 Technical Specification 3 1 Main technical specification Model D9 1 1 178818 O Rated value 0 40 CH Minimum setting 0 15V 36A 1 5V 360A 0 15V 48A 1 5V 480A oar range 0 18V 0 120V 0 18V 0 120V CV mode mv 0m gt 0 0 0 0 0 025 0 05 FS 0 025 0 05 F8 0 04 See GE Een use BS 0 36A 0 360A SO CC mode 0 05 0 1 FS 0 mikse 0 05 0 1 FS 0 05 0 1 FS CR mode resolution ioe Tt seess ew mode ssn range CW mode Measurement range 0 18V 0 120V 0 18V 0 120V Resolutio 4 mV 10mV 1 mV 10mV 0 0 0 0 0 0 Accuracy 0 025 0 025 FS 0 025 Cep F 0 025 gni Y
41. rotection 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 VFD will display OTP 4 14 1 Over Voltage Protection OVP If the OVP circuit has been triggered input will be shut down buzzer alarm 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 TTL high voltage level you can control the output state of the power supply under test via this pin 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 the range please disconnect the instrument under test Press any key on the front panel or send commandPROTection CLEar the OVP displayed on the front panel will disappear load exits OVP protection state 4 14 2 Over Current Protection OCP The electronic load includes both hardware and software over current protection features Hardware OVP load s maximum input current will be limited at about 110 of the current range once the hardwa
42. t panel Short operation won t affect the present setting When turn off the short state the load returns to the original set state The actual current of the electronic in short operation depend on the mode and range active when the short is turned on In CC CR or CW mode the maximum short current is 120 of the current range In CV mode short means setting the load s constant voltage to be OV 4 4 System menu System Press number 5 to enter the system menu INITIALIZE SYSTEM o Initialize Keep the current configure Reset all configuration to default to default AS POWER ON PARAMENT MENE RST default Set the Loge stans beis s input state to be the Power ON default state when power on SAVO Set the load s input state to be that of User Manual 20 SAVE 0 set when power on Buzzer Knob Old INoupdate gt Manual trigger Trig IMM available Trigger bytimer _ Operated with Recall button to recall 100 groups Memory memories Group 0 9 0 represent group 1 10 1 represent a Dien COMMUNICATION Select the communication interface when communicate with PC Trigger RS232 4800 8 N no parity 1 NONE Move the 9600 O odd CTS RTS Communication direction keys to 19200 E even XON XOFF select the soane aion SE Es SCPI Default SCPI _ P SE Extend Table Extended SCPI protocol compatible with other units Knob function real time update means after you adjust
43. the parameter by knob and then put the load to OFF state the settings keep for the latest setup If you choose no update when you turn the load to OFF state the settings will keep the old settings 4 5 menu Config u number 6 key to enter the config menu VOLTAGE ON Set the load s von point CONFIG Sett MENU Von Von point living state ON OFF Point 2V set the Von value 21 User Manual Protect Measure CR LED Ext Program User Manual IT8800 User Manual Latch Von point latch state ON OFF Point 2V set the Von value PROTECT MENU Setup hardware power protection MAX POWER Point 149 99W set hardware OPP value Setup software current protecting state CURRENT LIMIT On enable the function Point 30A set the software OCP level Delay 3S set the software OCP delay Off disable the function Set the software power protection level POWER LIMIT Point 150W set the soft power protection level Delay 3S set the soft power protection delay Set LOAD ON timer ON TIMER On enable the function Delay 10S set LOAD ON timer value Off disable the function MEASURE MENU V Range Voltage auto range function VOLTAGE AUTO RANGE On voltage auto range function on Off voltage auto range function off TimeV1 Test the voltage rise fall time TIMER VOLTAGE set the start voltage level Point 0 000V o Enable the function in CR mode press n END CV to set Vd Disable this function REMOTE SENSE Remote sense functio
44. y the input current s changing User Manual 32 ECH IT8800 User Manual Chapter5 Operation introductions 5 1 Operation modes 5 1 1 Constant current CC set a value from 0 to upper limit of current There are 3 means to change the current value 1 In CC mode rotate Rotary SW 2 In CC mode press number to set the current directly press GED key to confirm 3 In CC mode press CV Setup to set according to the steps below Steps Operation details VFD display Constant Current In CC mode press CV setup to enter Range 0 000A the parameter setup interface Set the max working current press GZEDto Constant Current confirm Range 1 000A 3 set the upper limit of voltage press EN Constant Current button to confirm High 0 00V 4 set the lower limit of voltage press GED button Constant Current to confirm Low 0 000V Constant Current Set the high low rate press GSD to confirm High Rate Low Rate Constant Current KE Set the current rise slope press GP to confirm Rise up 0 000A uS Constant Current EE Set the fall slope press ED to confirm Rise down 0 000A uS 10 0000V 0 0000A e The parameters are set OK 0 00W CC 1 000A 5 1 2 Constant voltage CV set a value from minimum setting voltage to upper limit of voltage There are three means to change the voltage value 1 In CV mode rotate Rotary SW 2 In CV mode press numeric keys directly to set the current value press Gi9to confirm 3 In CV mode press CV Setup to set ac
Download Pdf Manuals
Related Search