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users guide programmable dc electronic load models it8518 copyright 2010 all rights reserved ver2,0/jan, 2010/ it8500-401 this user manual is applicable to: model: IT8518B/it8518c/it8518e/it8518f http://
quick reference 7 the front p anel ................................................ 7 the rear p anel ........................................ 8 front panel annunciators ......................................... 8 key pad ................................................ 9 immediate action keys ........................................... 9 menu operation ............................................ 10 general information 12 document orientation ............................................. 12 getting started map ............................................... 12 options and accessories ......................................... 13 options ............................................ 13 accessories ............................................... 13 description ........................................... 13 features and capabilities .......................................... 13 front panel controls .......................................... 14 remote programming ........................................... 14 operating modes ............................................. 14 constant current(cc)mode .................................. 14 constant resistance (cr) mode ............................... 14 constant voltage (cv) mode ................................. 15 const ant power (cw ) mode ................................. 15 transient opera tion .................................. 16 continuous ................................... 16 pulse ..................................... 16 t rigger mode ..................................... 17 list operation ............................................. 17 triggered opera tion ............................................. 18 input control ..................................... 18 short on/off ..................................... 18 input on/off ..................................... 19 operation range ............................................ 19 protection features .............................................. 20 remote sense function ..................................... 21 saving and recalling settings ................................... 22 battery testing ............................................ 23 von/voff operation ............................................. 24 installation 25 inspection ................ ............................ 25 damage ................................................... 25 introduction 2 users guide
items supplied ............................................ 25 cleaning ............................................... 25 location .................................................. . 26 installation ............................................... 27 bench operation ................................................ 27 input connections ............................................... 27 power cord ............................. 27 turn-on checkout 28 introduction ........................................... 28 checkout procedure .......................................... 28 29 front panel operation example ................................................... 30 i-set (set up a constant current from 0 to max current ) ........ 30 p-set (set up a constant power from 0 to max power) ........ 31 r-set (set up a constant resistance from 0.1 to 4000) ........ 31 v-set (set up a constant voltage from 0.1v to max voltage) ........ 31 shift + store ................................................. 32 shift + recall .................................................. 32 in on/off input setting ............................................. 32 transition testing opera tion ................................ 32 t ransition parameter setting ................................... 32 continuous transient operation ................................... 33 pulse transient operation ................................. 33 t oggled t ransient operation ..................................... 34 list operation ............................................. 34 fast recall function ......................................... 36 aut oma tic testing function of electronic load .............. 36 edit the testing file ............................... 37 fast recall the test file ..................................... 38 automatic t esting ............................................. 38 select the resolution between low range and high range ......... 39 specificatioin 4 41 communication cable .......................................... 41 communication between electronic load and pc ............... 43 users guide 3 in case of trouble ............................................. introduction
warranty information certifcation the operation for the software frmware or hardware shall be uninterrupted or error free. modifcation or misuse, operation outside of the environmental specifcations for the product, not limited to lightning, water, fre, abuse or negligence.
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 customers 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". 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 frmly 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 fammable 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 qualifed 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. users g ui de 5
warning: 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. caution: caui ign not a aar it ca attntion to an orating rocur or t i ic i not corrct ror or ar to cou rut in aag to or truction o art or a o t rouct do not roc on a caui ign unti t inicat conition ar u unrtoo an t both direct and alternating current protective earth (ground) terminal caution (refer to accompanying documents) safety symbols direct current alternating current do not service or adjust alone do not try to do some internal service or adjustment unless another person capable of rendering frst aid resuscitation is present. 6 users guide
16-character display shows voltage and current measurements rotary knob power switch on/off entry keys: numeric keys enter values increasing or decreasing the setup values menu commands keypad: enable/disable input. setup the current, resistance and voltage modes. set and reset protection functions. scroll through front panel. quick reference the front panel users guide 7 quick reference
front panel annunciators off front panel annunciators trigger indicates that the electronic load is waiting an initiate and trigger to occur. cc constant current (cc) mode . sense ndicates that the electronic load is in remote sensing state cv constant voltage (cv) mode. error a errors have occurred cw constant power (cw) mode. link in the communication state cr resistance (cr) mode. rmt indicates that the electronic load is in remote state (rs-232). in the remote state, only the active key is the local key. tran the input channel is enabled for transient operation. shift indicates that the shift key has been pressed. list list mode is initiated or running lock keyboard is locked by password unr the input is unregulated. the rear panel quick reference 8 users guide input terminals 3 pin iec320 ac input connector fuse power switch (110v / 220v) 9-pin com port interface connector 4 pin trigger and remote sensing connectors
key pad immediate action keys 1 4 2 8 9 6 0 5 7 3 es c i-se t v-se t r-se t shif t p-se t ente r powe r a b t r a n store recall s-tran men u local batter y s h o r t t r i g g e r on/off switch to a setting value switch to b setting value start /stop transition operation press to store an existing electronic load state in non-volatile memory. press to recall an existing electronic load state in non-volatile memory. set the transition operation parameter enter operation menu. w h e n t h e l o a d i s c o n t r o l l e d b y p c , p r e s s t h e s e k e y s t o e n a b l e t h e front panel key battery discharge electronic operation turn on or turn off short circuit test. causes a trigger to occur. change the trigger source is immidiate shif t shif t shif t shif t shif t shif t shif t shif t shif t shif t shif t trigger a b menu s-tran battery local store tran recall short ~ 0 through 9 are used for entering numeric values. decimal point. the escape key. it may used to exit any working state. choosing cc mode and setup the input current of regulation current mode. choosing cv mode and setup the input voltage of regulation voltage mode. choosing cw mode and setup the input watt of regulation power mode. choosing cr mode and setup the input resistor of regulation resistance mode. shift keys. power on/off scrolling keys let you move through the commands in the presently select function menu, bring up the next command in the list. function menus are circular; you can return to the starting position by continuous pressing the key. go back to the previous command in the list .function menus are circular; you can return to the starting position by continuous pressing the key. confrmation key. shif t l-set on/off v-set enter 0 9 esc p-set r-set users guide 9 quick reference
menu operation press menu to indicate operation mode .v iew the menu in vfd and using and to scroll through the completely menu list as following. if press key , you could get the selected menu function. press back to the previous menu selection page. enter esc menu config initial config return to the factory default setup value. input recall setting power-on state of load. on when users turn on the electronic load; the electron load setup value will keep the state of last time when users turn off the electronic load. off disable this function. power-on recall setup of the electronic load input state in power on. on when users turn on the electronic load; the electronic load input will keep the state of last time when users turn off the electronic load. off when users turn on the electronic load, the electronic load input will keep the state off. key sound set keypad sound setting. on enable key sound. off disable key sound knob lock set setup rotary knob lock state. on lock rotary knob off unlock rotary knob. short cut recall quickly recall the data stored before on off> range select change the measure precision of voltage and current external off> remote sense setup voltage measurement mode. on the electronic load will measure input voltage from the remote sense connector. off the electronic load will measure input voltage from the front panel connector. adc upda te ra te high low trigger source choosing the trigger signals source. immediate trigger signals from + key external trigger signals from the trig connector in the rear panel. bus communication command trigger mode. connect mode maxtidlexing separate trigger shif t quick reference 10 users guide
baudrate set setting baud rate. 4800 9600 19200 38400 comm. parity set command parity setting. none even odd address set setting communication flow mode setting keypad password. exit system set setup the maximum current. setup the maximum power. setup the maximum voltage voltage onset voltage offset exit list set mode set setting operation mode. fixed mode fixed mode. list mode choosing list mode. call list file recall list operation fle. edit list file edit list operation fle. list store mode users can choose 4 kind of memory space to save the list fle. 8 x 120 steps total 8 fles and each fle have120 list steps. 4 x 250 step total 4 fles and each fle have250 list steps. 2 x 500 steps total 2 fles and each fle have500 list steps 1 x 1000 steps total 1 fle and each fle have1000 list steps. exit load on timer timer st a te setting load on timer state on when users choose on, and then turn on the electronic load input, the load on timer will start working. when the load on timer is reach the setup time, the electronic load input will turn offautomatically. off setting time of load on timer. exit exit timer set max power set max current set max voltage set key lock set users guide 11 general information
general information getting started map this manual describes the operation of the it8500 series electronic loads. unless otherwise noted,all units will be referred to by the description "electronic load" throughout this user's manual. the following documents and software are shipped with your electronic load. this user's guide (this document), contains installation, checkout, front panel information and detailed programming information. the getting started map will help you fnd the information you need to complete the specifc task thatyou want to accomplish. refer to the table of contents or index of each guide for a complete list of the information contained within. document orientation task where to fnd information checking out the unit verifying proper operation using the front panel users guide using the front panel front panel keys front panel examples users guide using the programming interface rs-232 interface users guide remote operation mode protocol information users guide controller program and software driver: power view pv8500 software active driver pd8500 ocx software cd-rom (if youve purchased the communication cable, you will get it for free) general information 12 users guide
options and accessories options it-e131 isolated communication cable: this cable converts the electronic loads series port (ttl 5v level) to pc rs232 interface. it-e132 isolated communication cable: this cable converts the electronic loads series port (ttl 5v level) to pc usb interface. it-e134 isolated communication cable: this cable converts the electronic loads series port (ttl 5v level) to pc gpib interface. accessories power cord users manual software cd-rom (if you buy the communication cable, youll get it for free) calibration testing report description the it8500 series electronic load is used for design, manufacturing, and evaluation of dc power supplies, batteries, and power components and so on. the electronic load contains a processor, serial port connector, front-panel keypad and vfd, and other circuits common to the other entire load module.it8500 series electronic load could work in constant current (cc) mode, constant voltage (cv) mode, or constant resistance (cr) mode and constant power(cw) mode. features and capabilities ? high accuracy and high resolution ? capable to work with constant current (cc), constant voltage (cv), constant resistance (cr) mode and constant power (cw) operation. ? serial port interface-db9-rs232 port. ? triggered input and measurement functions. ? within the controlled keypad in the front panel ? built-in pulse generator for continuous, pulsed, and toggled transient mode operation. ? over voltage, over current, overpower, and over temperature protection. ? fan speed control by temperature. ? vfd display ? short circuit test ? battery testing function. users guide 13 general information
front panel controls the front panel has keyboard controls for setting the input voltage, current and resistance. the panel display provides digital readouts of a number of functions including the inputs. annunciators displaythe operating status of the electronic load. operating modes the four modes of operation are: 1: constant current (cc) 2: constant voltage (cv) 3: constant resistance (cr) 4: constant power (cw) 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. cc mode can be set with front panel keys. the cc mode parameters are discussed in the following paragraphs. lo a d curren t lo ad input volt ag e i v current setting cons t a nt current mode remote programming the electronic load may be remotely programmed from the computer via the it -e131 isolated communication cable. constant resistance (cr) mode in this mode, the module will sink a current linearly proportional to the input voltage in accordance with the programmed resistance. the cr mode can be set at the front panel. the cr mode parameters are described in the following paragraph. general information 14 users guide
constant voltage (cv) mode in this mode, the electronic load will attempt to sink enough current to control the source voltage to the programmed value. the module acts as a shunt voltage regulator when operating in the cv mode. the cv mode can be set at the front panel. the cv mode parameters are described in the following paragraphs. constant power (cw) mode in this mode, the electronic loads will consumption power accordance with the programmed value regardless of the input voltage. the cw mode can be set with front panel keys. the cw mode parameters are discussed in the following paragraphs. lo a d curren t lo ad input volt ag e i v slope resist a n ce setting cons t a n t r e s i s t a n c e m o d e lo ad current lo a d i n p u t volt a g e i v volt setting cons t a nt vol ta g e m o d e lo ad curren t lo a d i n p u t volt a g e i v power setting cons t a n t p o w e r m o d e v2 v3 i2 i3 users guide 15 general information
constant power (cw) mode in this mode, the electronic loads will consumption power accordance with the programmed value regardless of the input voltage. the cw mode can be set with front panel keys. the cw mode parameters are discussed in the following paragraphs. continuous generates a repetitive pulse stream the toggles between two load levels and change the state between value a and value b. pulse switch to value b as receiving one trigger signal , taking the pulse time(twd) of value b , load will return to value a . 10 a 5a continuous transient operatio n 2.0m s 3 .0ms 10 a 5a pulsed transient operation 10ms tw d 10ms tw d trig trig general information 16 users guide
trigger mode switching the state between value a and value b once receiving a triggering signal list operation list mode lets you generate complex sequences of input changes with rapid, precise timing, which may be synchronized with internal or external signals. list operation can be changed by edit every step value and time in list operation. the parameter of list operation include the group fle name, input step setting (the max steps is 1000 steps),time of one step(1ms~1h) and setting value of one step. in cc mode, dwell time range is 1ms to 6s, which also have an associated value. note that lists data can only be saved in total 1000 steps memory of 4 situations. when receiving one trigger signal, it will start the list operation until receiving another trigger signal or fnish the list operation. 10 a 5a tr g tr g toggled transient operatio n group total = 1000 steps 1 1000 steps 2 500 steps 500 steps 4 250 steps 250 steps 250 steps 250 steps 8 120 steps 120 steps 120 steps 120 steps 120 steps 120 steps 120 steps 120 steps tr igge r 1 0 2 3 4 5 list count=1 list count=2 list sequence users guide 17 general information
triggered operation the electronic load has various triggering modes to allow synchronization withother test equipment or events. such as: keypad triggering mode: press + to trigger the electronic load. ttl triggering mode: send a high pulse with a constant time more than 5m sec to the trigger terminals in rear panel to trigger the electronic load. command trig gering mod e: send triggering command to the electronic load via the serial port. short on/off load can simulate a short circuit at its input by turning the load on with full-scale current. the shortcircuit can be toggled on/of f at the front panel using the + . short operation is not infuence the operation setting current value , when short operation is on off state ,load back to the original setting state. the actual value of the electronic short is dependent on the mode and current range that are active when the short is turned on. in cc, cw and cr mode, the max short-circuit current value is 1.2 times of the current range. in cv mode, short-circuit operation is same as the operation of setting cv to 0v. input control trigger shif t shif t short note: turning the short test on in cv mode may cause the load to draw so much current that the software current limit operates, which may turn the input off. turning the short circuit on does not affect the programmed settings, and the load input will return to the previously programmed values when the short is turned off general information 18 users guide
input on/off e l e c t r o n i c l o a d ' s i n p u t c a n b e t o g g l e d o n / o f f a t t h e f r o n t p a n e l . t u r n i n g t h e i n p u t o f f ( z e r o c u r r e n t ) does not affect the programmed settings. the input will return to the previously programmed values when the input is turned on again. note :the input on/off command supersedes the mode commands and short test on/off command. operation range work in the range of rated current, rated voltage and rated power, the fgure is as following: input voltage v rated v o ltag e r a t e d po w e r input current i rated curre nt input volt ag e v rated v o ltag e soft w a r e p o w e r l i m i t i n p u t c u r r e n t i r a t e d c u r r e n t soft w are current limit c a operation mode change state users guide 19 general information
protection features electronic load includes the following protection features: over voltage if input voltage exceeds the voltage limit set by the user, the dc load will turn the input off and the buzzer will turn on. the display will show over voltage as following. the maximum voltage limit value is equal to 100%+5% of the maximum rated voltage for each model. o ver v o l t a g e r ever s e vo l t ag e o ver h ea t over current when operating in cr, cc or cp mode, the load current will be limited by a current limit value set by the user. the maximum current limit value is equal to the maximum rated current for each model. once the maximum current limit is reached, the dc load will enter the over current protection state. if the dc load previously operated cr or cp mode, the dc load will automatically revert to cc mode and the vfd display will indicate cc. when the dc load operates in a combined cv / transition mode or cv / list mode, the buzzer will sound if the input current exceeds the current limit and the display will show a fashing current value. over power if the input power exceeds the power limit in the normal operation mode, load will work in the over power protection state. vfd displays the information as cw. when work in transition mode and list mode, if the input power exceeds the power limit. buzzer is mooing, vfd display the fashing current value and voltage value. reverse voltage this feature protects the load module in case the input dcvoltage lines are connected with wrong polarity, if a reverse voltage condition is detected, buzzer is mooing. vfd display as following: over temperature if internal power components temperature exceeds safe limits (80 ), over temperature protection is on work . load will turn off the input and buzzer is mooing, vfd display as following: general information 20 users guide
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. 4 pin trigger and remote sensing connectors: remote sensing: sense (+) and sense (C) are the remote s e n s i n g i n p u t s . b y e l i m i n a t i n g t h e e f f e c t o f t h e i n e v i t a b l e v o l t a g e drop in the load leads, remote sensing provides greater accuracy by allowing the load to regulate directly at the source's output terminals. trig: a t t l - c o m p a t i b l e i n p u t t h a t r e s p o n d s t o e x t e r n a l e d g e trigger signal. a trigger applied to this input can be used to change settings (voltage, current, resistance, etc.), toggle between settings in transient-toggle mode, or generate a pulse in transient-pulse mode. you must set the remote sense mode in the menu before using the remote sense function. action: (1) press + key into the menu (2) vfd displays > config , press key to confrm (3) press key to choose> remote sense , press key to confrm (4) press / to choose> on , press key toconfrm and the remote sense function has been set. shif t menu enter enter enter users guide 21 general information in sense trigger b a
wiring diagram for remote sense saving and recalling settings the electronic load has internal registers in which settings (mode, current, voltage, resistance, transient level, etc.).users could use + and + to save and recall the relative data as following: cc value /cw value /cr value /cv value t ransition current a value /t ransition current b value /t ransition voltage a value /t ransition voltage b value / transition power a value /transition power b value /transition resistance a value /t ransition resistance b value shif t store recall shif t current a pulse width time/ current b pulse width time/voltage a pulse width time/ voltage b pulse width time /power a pulse width time/power b pulse width time /resistance a pulse width time /resistance b width time transition current testing mode/transition voltage testing mode/transition power testing mode /transition resistance testing mode max current value / max voltage value / max power value action 1) press , set a value of current or voltage, press to confrm. 2) press + set a store code at random, press to confrm. 3 ) p r e s s + , s e t t h e s t o r e c o d e t h a t y o u s e t b e f o r e , p r e s s t o c o n f r m , then you can get the number stored. l-set enter enter enter recal l shif t shif t store general information 22 users guide
battery testing experiment proves the test with load is the best method to ensure the battery whether work well or not. only with the correct load testing, the battery can be confrmed if it was being the expectant life curve location. the electronic loads can be used to test any type of the battery nowadays. as the accumulator is used by any sheltered equipment or the uninterrupted service system, it is necessary to use the load testing. because the battery nearly is the lowest reliability component, so it must use the load testing periodic ensure the security of the battery. capability 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, electronic load power and spare capability of accumulator. if connecting with pc software, discharge curve could be displayed in window. this test can refect the reliability and using time of accumulator. so, its necessary to do the test before you change another new accumulator. operation: 1. turn off the load, connect with the tested battery. 2 . p r e s s v f d d i s p l a y c u r r e n t = * * * * * a . setting the discharge current of the battery, then press to confrm. 3. press + , vfd display min volt= ****v, setting the voltage when turned off, press to start the capacity testing. when the battery voltage is same as the voltage without power, the load turns off. during the testing, use and to change the voltage , actual discharge current ,the electronic load power and the released discharge capacity of the battery . 4 . t h e n p r e s s + , e x i t t h e b a t t e r y capacity testing mode. battery v o l t a g e m i n v o l t a g e load sink curren t v t i t l-set enter enter battery battery shif t shif t users guide 23 general information
von/voff operation y ou can set voltage value v on/v of f to control the input state on/of f for electronic load. when the input voltage reaches the von value, the loads input state is on. when the input voltage reaches the voff value, the loads input state is off. action for set von/voff value: 1. press + into menu. 2. vfd display s >config, press key to choose >system set, press to confrm. 3. vfd displays >max current set, press k e y t o c h o o s e > v o l t a g e o n s e t , p r e s s k e y to confrm. 4 . v f d d i s p l a y s > v o l t . o n = 0 . 0 0 v , p r e s s n u m e r i c keys to set von value (0.1v to max voltage value), press to confrm. 5 . p r e s s k e y t o c h o o s e > v o l t a g e o f f s e t , press to confrm. 6. vfd displays >vol t .off=0.00v , press numeric keys to set voff value (0v to max voltage value), press to confrm. enter enter enter enter enter shif t menu general information 24 users guide
inspection damage when you receive your electronic load, inspect it for any obvious damage that may have occurred during shipment. if there is damage, notify the shipping carrier and nearest agent offce and support offce immediately. items supplied the following user replaceable items are included with your electronic load. cleaning use a dry cloth or one slightly dampened with water to clean the external case parts. do not attempt to clean internally. item part number description power cord it-e171 users will get one of the power cords appropriate for your location. it -e172 it-e173 it-e174 user's guide contains installation, checkout, and front panel information and software cd-rom programming information calibration report the instrument calibration report. warning: to prevent electric shock, unplug unit before cleaning. users guide 25 installation
location the outline diagram in following fgure gives the dimensions of your electronic load. the electronic load must be installed in a location that allows suffcient space at the sides and back of the unit for adequate air circulation. outline diagram unit (mm) installation 26 users guide
bench operation a fan cools the electronic load by drawing air through the button and sides and exhausting it out the back. minimum clearances for bench operation are 25 mm along the sides. caution: do not block the fan exhaust at the rear of the load. users guide 27 installation 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 fgure for the part number and ordering options. warning: shock hazard: the power cord provides a chassis ground through a third conductor. be certain that your power outlet is of the three- conductor type with the correct pin connected to earth ground. note: the detachable power cord may be used as an emergency disconnecting device. removing the power cord from the ac input connector will disconnect ac input power to the unit. china united states, canada europe united kingdom it-e171 it-e172 it-e173 it-e174 e n l e l n e n l e l n
introduction successful tests in this chapter provide a high degree of confdence that the electronic load is operating properly. checkout procedure the test in this section checks for proper operation of the electronic load. if you have not already done so, connect the power cord to the unit and plug it in. procedure display explanation 1. turn the unit on. the electronic load undergoes a self-test when you first turn it on. during self test, all segments are briefy lit 2. wait for 1s after turn on electronic load. eprom error eeprom damage or lost data of last power off run well if no such display, system will go to the step 3 directly. 3. wait for another 2s. error cal.data eeprom lost calibration data run well if no such display, system will go to the step 4 directly. 4. press shift button and keys . load model:it85xx sn: xxx-xxx-xxx ver x.xx display the information of the product t ype, series number version of software. 5. press button 0.000v 0.000a display the actual input voltage and current value. 6.press 0.000w i: 0.000a display the actual power value and setting value. esc turn-on checkou t 28 users guide
in case of trouble electronic load failure to run during power-on operation. the test of following in this section help you to solve the possible problem when you turn on the power of electronic load. make sure if you have connected the power cord to the unit and plug it in. power switch have been pressed. check the power voltage setting. work voltage of load have two type 110v or 220v , please make sure it is right voltage accordance to the voltage in your area. you could change the voltage setting through dial the switch in the rear panel. check the fuse of load. if fuse is blowout, please change it as following specifcation. 1. 2. 3. users guide 29 turn-on checkou t model fuse specifcation(110vac) fuse specifcation(220vac) IT8518B 5at 250v 2.5at 250v it8518c 5at 250v 2.5at 250v it8518e 5at 250v 2.5at 250v it8518f 5at 250v 2.5at 250v
example i-set (set up a constant current from 0 to max current ) set up a constant dc current input is the frst main function of programmable dc electronic load, it8500 series electronic load provides two methods to set up the constant dc current input by using the number keyboard and the rotary button. please see the following operation procedure. procedure operation details vfd display step 1 press current=0.000a step 2 enter the password or jump the step 4 if your password for reentering password: step 3 enter the original value which displayed in the lcd or enter a new value by using number keys or rotary knob to adjust the voltage value current=*.***a step 4 press to confrm 0.00v 0.000a enter l-set setup the input current at 4.33a. method 1: to set up by using number keyboard step1. press button. step2. press numeric button to enter the current value 4.33. step3. press button to confrm the current value. method 2: to set up by using rotary sw if the key board is unlocked by password, directly adjust the rotary sw button, and voltage will be continually changed from the previews value according the rotation. at the beginning, the cursor will be shown on the last number of the value which is indicated on the vfd, you can move the cursor to the frst number, second number etc by using number buttons, and then adjust the rotary sw to change each number, and let it stay at *.** a. please see the following description. then press i-set to confrm the value. 0.00a 0.00v 0.0w 4.33a enter l-set l-set procedure : step1. press button, step2. adjust the rotary knob to change the value, the operation is as the same as item (1) step5. press button to confrm the current value. l-set enter front panel operation 30 users guide
p-set (set up a constant power from 0 to max power) it8500 series electronic load can be set up for a constant power. constant power setup procedure is as following: r-set (set up a constant resistance from 0.1 to 4000) it8500 series electronic load can be setup for a constant resistance. constant resistance setup procedure is as following: v-set (set up a constant voltage from 0.1v to max voltage) it8500 series electronic load can be setup for a constant voltage. constant voltage setup procedure is as following: procedure operation details vfd display step 1 press power =0.0w step 2 enter a new value by using numeric keys or rotary knob to adjust the voltage value power=*.***w step 3 press to confrm. 0.000w p:*.000w enter p-set procedure operation details vfd display step 1 press resistance =0.0r step 2 enter a new value by using numeric keys or rotary knob to adjust the resistance value resistance=*****r step 3 press to confrm. 0.000w r:0000r enter r-set procedure operation details vfd display step 1 press voltage=1.500v step 2 enter a new value by using numeric keys or rotary knob to adjust the resistance value voltage=*.***v step 3 press to confrm. 0.000w v:3.000v enter v-set users guide 31 front panel operation
shift + store procedure operation details vfd display step 1 press and store 1 step 2 press to confrm. store the relative data enter shif t store shift + recall procedure operation details vfd display step 1 press and recall 1 step 2 press to confrm. recall the saving data enter shif t recall in on/off input setting use to change the input state of electronic load. switch on to of f state by press out on/of f out on/of f transition parameter setting users could press + to set the transition parameter . shif t s-tran + level a =0.000a setup value a width a = 0.5ms setup time width of value a level b=0.000a setup value b width b= 0.5ms setup time width of value b >continuous >pulse >toggled choose one of the three transition modes finish transition setting shif t s-tran enter enter enter enter enter front panel operation 32 users guide
continuous transient operation 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 this following example, assume that the cc mode is active; the applicable transient operation parameters have been set as follows. for example: continuous mode, current level a =5a, width = 2ms. current level b =10a, width = 3ms. testing machine input voltage is 12v. pulse transient operation in this mode, generates a transient pulse of programmable width when pulsed transient operation is in effect. for example: when load receiving one trigger signal, it will switch to 10a current value, and taking 10ms to return the current value of 5a. action 1. select the operation mode (cc,cv,cr or cp), and set a proper value, press to turn off the load input. 2. press + , set level a=5a, press , set width a=3ms, press set lever b=10a, press , set width b=2ms, press to confrm. 3. transition mode now is continous, press to confrm. 4. press + to activate the transient mode. 5. press + again to stop the transient operation. 6. press , the input of load is powered on. shif t shif t shif t enter enter enter enter enter tran tran s-tran on/off on/off 10 a 5a continuous transient operation 2.0m s 3 .0ms users guide 33 front panel operation
action 1. select the operation mode (cc,cv,cr or cp), and set a proper value, press to turn off the load input. 2. press + , set lever a=5a, lever b=10a, width b=10ms. transition mode now is continous. 3. press till >pulse. 4. press , set transient mode is pulse. 5. press + to activate the transient mode. 6. press + to start another pulse. press + , get more pulse. 7. press + again to stop the transient operation. 8. press , the input of load is powered on. shif t shif t shif t shif t shif t enter tran tran s-tran on/off on/off trigger trigger toggled transient operation in this mode, after transition operation start, load could change the input between the main level and the transient level when toggled transient operation is in effect. for example: when load receives one trigger signal, load current will switch between 5a and 10a. 10 a 5a pulsed transient operation 10ms tw d 10ms tw d trig trig 10 a 5a tr g tr g toggled transient operatio n front panel operation 34 users guide
action 1. press + , setting lever a=5a, lever b=10a, transition mode is toggled. 2. press + to activate the transient mode. 3. press + switch to the current value of 10a. 4. press + switch between 5a and 10a. 5. press + again to stop the transient operation. shif t shif t shif t shif t shif t tran tran s-tran trigger trigger list operation users can use the front panel keypad or power view 8500(pv8500) software to programming the list sequence. please refer to the software users guide. the following example will help you how to do the list operation in front panel. action 1) press the button of , execute the input of load i in off state. 2) press + , move cursor to the option of menu of config, press into the next step menu, move cursor to trigger source. press and move cursor to immediate , setting trigger source mode is panel immediate mode. 3) press to confrm. 4) press to the previous menu, move cursor to list set. 5) press into the next step menu .move cursor to edit list file. 6) press into the next step menu, move cursor to current list, select current mode. 7) press , move cursor to repeat. setup list is in cycle mode. 8) press to confrm, setup the list steps = 5. 9) press to confrm, setup step 1 current =3a. shif t on/off menu esc enter enter enter enter enter enter enter enter tri gger 1 0 2 3 4 5 list count=1 list count= 2 list sequence users guide 35 front panel operation
fast recall function y ou recall 10 groups numbers very conveniently which were stored before. automatic testing function of electronic load y ou test various parameters of power supplies at dif ferent loads. now we take a kind of charger as an example to explain the usage of the automatic testing of the electronic load. action 1) press + 2) pressto config, press into submenu, press to shor tcurt recall 3) press , select on and press to confrm. 4) press two times and quit the menu. 5) press and you can get the frst group number. press , you can get the second group number. press , you can get the tenth group number. and if there is not stored number, vfd will show no eeprom data. esc enter enter enter shif t menu 1 0 2 action 10) press to confrm, setup step 1 width=6ms. 11) repeat 7) and 8) operation , set current and width of one step 0a, 5ms;2a, 4ms;6a,2ms;0a,5ms. 12) press to confrm, menu store list file 1, save fle in group1. 13) move cursor to mode set , press to enter into the next step menu to set mode is 14) press to confrm 15) press , press , make load in on state. press + , make list operation run or stop. 16) stop the list operation mode. move cursor to list set, press , move cursor to mode set in option menu, press , enter into next step menu. select mode is . 17) press to confrm. shif t on/off esc enter enter enter enter enter enter enter trigger front panel operation 36 users guide
the test proceeding of r35 charger process method mode voltage(v) current(ma) power(w) ripple counter 1st step cc 5.8 6.15 210 4(input175vac) 50mvpp 2nd step none 5.9 6.4 0 1.2(input175vac) 3rd step cc 5 205 245 4th step cv 3 205 245 5th step cv 2 205 245 6th step short circuit 0 245 edit the testing file 1) press + into menu, vfd displays config 2) press to list set. 3) press into submenu, press to edit list file. 4) press and begin to edit the automatic testing fle, vfd shows max curr= 20.000a, which means setting the maximum of voltage. the maximum is bigger than 3a, which means cc mode is in high range, here, the maximum is 3a. press and press to confrm. 5) vfd displays max volt=120.00v, which means setting the maximum of voltage, the maximum is bigger than 18v, which means cv is in high range, here ,the maximum is 18v. press + to set max volt=18v, press to confrm. 6) vfd displays max power=200.00w, which means setting the maximum of power, here, it is150w, press + + to set max power=150w, press to confrm. 7) vfd displays test count=2, which means setting steps of testing, 20 steps are p e r m i t t e d a t m o s t , h e r e , t h e y a r e 6 s t e p s . p r e s s t o s e t t e s t c o u n t = 6 , p r e s s t o confrm. 8) setting the mode of current procedure, press to choose one mode in const current const voltage const power const resis. here, the frst step is cc mode, press to >const current, press to confrm. 9) vfd shows set 1=20.000a, which means setting the current procedure. here, the frst sis 0.21a, press + + + , then press to confrm. 10) setting whether the current procedure is short circuit or not, press to choose one in short on or short off. here the frst step is short off. press short off, press to confrm. 11) select the test number of this step, press to choose >readback v, press to confrm. 12) vfd displays min 1=120.00v, which means setting the lower limit. here, the frst step is 5.8v. press + + , press to confrm. 1 1 1 0 0 2 enter enter enter enter enter enter enter enter enter enter enter shif t menu 3 5 5 6 8 8 users guide 37 front panel operation
13) vfd displays max 1=120.00v, which requests setting the upper limit. here, the frst step is 6.15v, press + + + ,then press to confrm. 14) vfd shows delay 1= 1.0 s , which means setting the prolong time, that is how long we can read the testing value after inputting the value we settled. to wait for testing after the input stable, the range of prolong time is 0 25.5 seconds, when the setting is 25.5 seconds, automatic testing will be pause, only the user press + ,the testing will continue. here, the frst step is 1 second, press and then press to confrm. 15) repeat 9) 14), and set the other process step by step as follows: a. const current,0a,short off, read back v, 5.9v, 6.4v,1s b. const voltage, 5v, short off,read back a, 0.205a, 0.245a,1s c. const voltage, 3v, short off, read back a, 0.205a,0.245a,1s d. const voltage, 2v,short off, read back a, 0.205a,0.245a, 1s e. const current, 0a, short on, read back a,0a,0.245a, 1s 1 6 ) v f d d i s p l a y s s h o r t t e s t f i l e * , w h i c h r e q u e s t s s a v i n g t h e f l e s e d i t e d t o e e p r o m , automatically testing fles and list fles use a common memory area, and the area can contain 8 groups of automatic testing fles for next usage. here, the testing fle could be saved in the frst group, press and press to confrm. 17) when the edition of automatic testing fle is fnished, press two times to back the menu. 1 1 1 5 6 enter enter enter enter shif t trigger fast recall the test file 1) press + to enter into menu, vfd displays>config 2) press and move the menu to>list set 3) press to enter into submenu, vfd displays>mode set 4) press and move the menu to>call test file 5) press and recall the fle edited enter enter shif t menu automatic testing after editing the automatic testing fle, the automatic testing could be carried out by the below steps. 1) p r es s + t o ent er in t o au t om a t ic t es t ing , v f d dis pla y s t h e n am e of c ur r ent fle: name: test file1 2) press to observe the voltage and current we inputted, and also can observe the step number of testing. 3) press + and begin to operate, when the automatic testing is pause (the current prolong time of one step is 25.5s), press + also can make the testing continue. enter shif t shif t shif t l-set trigger trigger front panel operation 38 users guide
4) when the automatic testing is fnished, the buzzer will hint by tweet (buzzer), vfd reads the result of testing. if the testing passed, vfd reads pass, or reads fault. press also to observe the numerical value and result of every step. 5) press to back the automatic testing. esc select the resolution between low range and high range 1) press + to enter into menu, vfd displays>config 2) press into the submenu, vfd displays>initial config 3) pressto make vfd display range select 4) press to confrm, and pressto choose on 5) press to confrm 6) press to exit menu esc enter enter enter shif t menu t h e n y o u c a n p r e s s + t o c h a n g e t h e v o l t a g e r a n g e ( m a x i m u m v o l t a g e ) . i f t h e f o r m e r maximum voltage value is 120v and the resoulution is 10mv, it will become 18v when you press + , and you will get 3 decimal points (xx.xxx) compared to 2 decimal points before. wheras if the former maximum voltage is 18v , you can press + to make it become 120v, also the resolution will become as 10mv. o n t h e o t h e r h a n d , y o u c a n p r e s s + t o c h a n g e t h e c u r r n e t r a n g e ( m a x i m u m current). if the former maximum current value is 12a and the resolution is 1ma, it will b e c o m e 1 2 0 a w h e n y o u p r e s s + , a n d y o u w i l l g e t 2 d e c i m a l p o i n t s ( x x . x x ) c o m p a r e d to 3 decimal points before. wheras if the fromer maximum current is 120a, you can press + to make it become 12a, and the resolution will become as 1ma. shif t shif t shif t shif t shif t shif t users guide 39 front panel operation
specifcations front panel operation 40 users guide parameter IT8518B it8518c it8518e it8518f input rating ( 0 ~ 40 ) voltage 0~500v 0 ~ 60v 0 ~ 60v 0~60v current 1ma~120a 1ma ~ 240a 1ma ~ 240a 1ma ~480a power 5000 w 5000w 6000w 5000w load regulation range accuracy resolution accuracy resolution 0~18v (0.05%+0.02%fs) 1mv (0.05%+0.02%fs) 1mv 0~60v/500v (0.05%+0.025%fs) 10mv (0.05%+0.025%fs) 10mv 0~12a/24a/48a (0.1%+0.1%fs) 1ma (0.1%+0.1%fs) 1ma 0~120a/240a/480a (0.2%+0.15%fs) 10ma (0.2%+0.25%fs) 10ma cv mode regulation 0.1~18v (0.05%+0.02%fs) 1mv (0.05%+0.02%fs) 1mv 0.1~60v/500v (0.05%+0.025%fs) 10mv (0.05%+0.025%fs) 10mv cc mode regulation 0~12a/24a/48a (0.1%+0.1%fs) 1ma (0.1%+0.1%fs) 1ma 0~120a/240a/480a (0.2%+0.15%fs) 10ma (0.2%+0.25%fs) 10ma cr mode regulation input current fs 10% input voltagefs 10% 0.1~10 (1%+0.3%fs) 0.001 (1%+0.3%fs) 0.001 10~99 (1%+0.3%fs) 0.01 (1%+0.3%fs) 0.01 100~999 (1%+0.3%fs) 0. 1 (1%+0.3%fs) 0. 1 1k~4k (1%+0.8%fs) 1 (1%+0.8%fs) 1 cw mode regulation input current fs 10% i n p u t v o l t a g e f s 10% 0~100w (1%+0.1%fs) 1mw (1%+0.1%fs) 1mw 100~5000/6000w (1%+0.1%fs) 100mw (1%+0.1%fs) 100mw current measurement 0~12a/24a/48a (0.1% + 0.1%fs) 1ma (0.1% + 0.1%fs) 1ma 0~120a/240a/480a (0.2%+0.15%fs) 10ma (0.2%+0.25%fs) 10ma voltage measurement 0~18v (0.02% + 0.02%fs) 1mv (0.02% + 0.02%fs) 1mv 0~60v/500v (0.02% + 0.025%fs) 10mv (0.02% + 0.025%fs) 10mv power measurement input current fs 10% input voltage fs 10% 0~100w (1%+0.1%fs) 1mw (1%+0.1%fs) 1mw 100~5000/6000w (1%+0.1%fs) 100mw (1%+0.1%fs) 100mw battery testing function input=0.1~60v/500v max measurement capacity= 999ah resolution =10ma timer range=1~60000sec transition mode range of frequency 0.1hz~1khz frequency error rate 0.5%
remote operation mode db9 in the rear panel of electronic load could connect with rs-232 through on ttl connector. the following information may help you to know how to control the output of electronic load through pc. 1 communication cable it-e131 rs232 communication cable the db9 interface connector on the rear panel of electronic load is ttl voltage level; you can use the communication cable (it-e131) to connect the db9 interface connector of the electronic load and the rs-232 interface connector of computer for the communication. it-e132 usb communication cable the db9 interface connector on the rear panel of electronic load is ttl voltage level; you can use the communication cable (it-e132) to connect the db9 interface connector of the electronic load and the usb interface connector of computer for the communication. co mp ut er in st ru me nt rx tx it -e 13 1 i so la te d co mmunica t i o n c a b l e tt l( 5v ) rs 23 2 is ol at io n 85 96 66 66 88 89 94 23 11 it co mp ut er in st ru me nt rx t x it - e 13 1 i s o l a t e d co mmunica ti on c ab le tt l( 5v ) rs 23 2 is ol at io n 85 96 66 66 88 89 94 23 11 it pc load it-e131 communication cable users guide 41 remote operation mode
it-e134 gpib communication cable the db9 interface connector on the rear panel of electronic load is ttl voltage level; you can use the communication cable (it-e134) to connect the db9 interface connector of the electronic load, and then connect gpib interface connector of it-e134 cable and computer with gpib/ieee 4888 line for the communication. note: forbidden to connect db9 connector in electronic load directly with pc or other rs232 port. co mp ut er in st ru me nt rx tx it -e 13 1 i so la te d co mmunica t i o n c a b l e tt l( 5v ) rs 23 2 is ol at io n 85 96 66 66 88 89 94 23 11 it co mp ut er in st ru me nt rx t x it - e 13 1 i s o l a t e d co mmunica ti on c ab le tt l( 5v ) rs 23 2 is ol at io n 85 96 66 66 88 89 94 23 11 it pc load it-e132 communication cable it-e134 isol at ed serial /ieee 488 controller it-e134 outer communication adapte r c o m i n t e r f a c e o f electron ic loa d gpib line remote operation mode e opn mode 42 users guide
2 communication between electronic load and pc before using the remote operation mode, please make sure that the baud rate and communication address in electronic load are the same as in the computer software, otherwise, the communication will fail, you can change the baud rate and communication address from the front panel or from computer. 1. address: the range is from 0 to 254, default setting is 0 2. baud rate: 4800,9600,19200 and 38400 are selectable 3. data bit: 8 bit 4. stop bit: 1 5. parity: none parity=none start bit 8 data bits stop bit db9 interface details db9 in the rear panel of electronic load is ttl level signal .it can be connecting with standard pc interface through the it-e131 isolated communication cable. 1 2 3 4 5 6 7 8 9 users guide 43 remote opera tion mode
china tel : 025-52415098 fax: 025-52415268 3 1 0 # n i n g n a n d a d a o , nanjing city, 210012, jiangsu province,china europe tel : 477-590101 fax: 477-572323 32, rue edouard martel 42100 - st etienne france south korea tel : 285-20680 fax: 285-20684 #153-783,rm601,byucksan, gasan-dong, seoul, korea usa tel : 714-9219095 fax: 714-9216422 22820 savi ranch parkway yorba linda, ca 92887 u.s.a. itech electronic co.,ltd

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