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1. 15 Select the steps needed to test For example if you want to test 4 steps press 1 2 3 4 0 stands for the tenth step If you want to cancel a step press the number key again to cancel Press Enter to confirm your selection Active SEQ 098765YYYY 16 If you want to suspend a step press the number key of the step For example to suspend step 2 press 2 Press the Pause Sequence number key again to cancel Then press Enter to confirm your 43Y1 selection 17 To edit the first step of the 4 steps determine whether you SEQO1 Short CH need short circuit testing on channel 3 and 5 For example if e te E O 5aY channel 3 needs short circuit testing input 3 Then press Enter iz to confirm your selection 18 Set load on time Ton For example if you need 2s input 2 and SEQO1 On Time then press Enter key to confirm z 2 0S 19 Set load off time Toft For example if you need 2s input 2 and SEQO1 Off Time then press Enter key to confirm 2 0S 69 20 Set test delay time Tpr For example if you need 1s input 1 and then press Enter key to confirm SEQO1 P F Delay Time 1 0S SEQO1 SEQO02 Ton i i E i Tof 2 S 0 Tpf Ton T off Tpf is test delay time 21 Repeat steps 17 through 20 and set the rest of the steps loa
2. The following is a step by step tutorial on how to set up a test file 67 Panel Operations VFD Display 1 Power on the electronic load Self test CHO3 CC OFF 2 Select the channel you want to edit and then edit every group s Vdc 0 0000V step For this example we will select channel 3 and channel 5 Adcz0 0000A A i below Press w keys to switch channel to 3 Wdc 0 00W 3 Press Setup key to enter the channel setup menu press Enter MODE CC key to enter the Mode selection menu and press W key to i RANGE HIGH select the operating mode Every step s mode can be edited Iset 1 00A Press Enter key to confirm Press W key to select lt ISet gt Press Enter to enter the menu and set the working current For example to set 1A press D and then Enter to confirm Const Current Set 1 000A Press V key to move the cursor to Vmax 82 000V and press Enter to set the upper limit of testing voltage In this example the first step is 5 8V Press G O and then Enter to confirm Voltage Upper Limit 5 800V Press V key to move the cursor to Vmin 0 000V and press Enter to set the lower limit of testing voltage In this example the first Voltage Lower Limit 0 150V step is 0 15V Press O S and then Enter to confirm inte 7 After editing the first step of channel 3 press Esc key to exit the menu CHO5 CC OFF 8 Press v keys to select channel 5 To edit the first s
3. oooncccccnnonncnnnnnoccnnnnnnonnnnnnnoccnnnnnocccnnnnnncccnnncoccnnnnss 50 Transient OperatiON 2 iron tero Eo iidceteccedsdeccsseccbeavecedets da seeCeasvesbevsetdveteceedeceseiteeetedeess 51 three S 51 ape s 52 REIA A A AA 53 Setting Up A B Transient Operation s sesesesesesesesesesesesesesesesesesesesesesesesesesesesesesesesesesesese 53 A 56 Setting Up List Operation Modle 4 oen toon ede uoo Lana na rane qn eo aad sake nna aa ka en ssb XR RR aa can inte 56 Triggered Operation me 60 Trigger FUNCION m ains co iisa Nica ados s nt ene tone g eng cec dass encre tres test eee 60 Trigger SOUFCe eerie oreet NO 60 Short Operations 60 Input On Off Operations nr eh rk n ne e RR i rr ERROR rn ee E RO i c 61 Von Operation E o eei ene verde en Fee exe eese eei ee evo nid tons ee eo Pee etos d Coe ane ere rene LE e Ea eines 61 Setting Up Von Function ii ins en sondedeees dosdaccetececoenesceubenseeecssees 62 Save and Recall Operation nc a 63 Module Controlling Link ansiada 64 Voltage Failure Indicators 65 Current Monitoring aerie S 65 Digital A o E N E AE E E E E 65 Remote Sense FUNCTION ici A a 66 External Analog Control ar DA id sensed 66 Automatic A EAN 66 Setting Up Test Files nue a ni 66 Recall Test Piles iii
4. 8 Press On Off key to turn on the electronic load s input The electronic load will begin sinking current at 5 V When in remote control mode you can send SCPI command VOLT ON lt n gt to set Von value send VOLT LATch ON to enable Von LATCH function Save and Recall Operation The stored settings of all channels can be recalled The stored parameters include operation mode voltage current values slew rate transient setting and more Up to 101 groups of setting parameters can be saved Group 0 can be used for power up settings Groups 1 through 100 can be used for automatic testing parameters All parameters are saved into non volatile memory and will remain saved even in a powered down state To Save Panel Operations VFD Display 1 After setting up your parameters press the Save key to save It Save Group will ask for the Save Group number 0 Save Group 2 Input the Save Group number 0 100 and press Enter to confirm 63 To Recall Panel Operations VFD Display 1 To recall saved data press the Recall key It will ask for the Recall Recall Group Group number 0 2 Input the Group number 0 100 you previously saved your Recall Group parameters to and press Enter key to recall 9 Module Controlling Link There is an 8 pin terminal and current monitoring connector on every module s rear panel O A 2G AE EN e eoe m
5. When setting up steps make sure all transient level slew and width parameters are within the modules specified limits 53 A B Transient Operation Tutorial Panel Operations VFD Display 1 Power on the electronic load Self test CHO1 CC OFF 2 Press A y keys to select the channel to be edited In this example we Vdc 0 0000V select channel 1 Adc 0 0000A Wdc 0 00W CHO1 3 Press Setup to enter the channel setup menu Select Mode and Mode CC Bom to change the operating mode to CC mode Press Enter to RANGE HIGH Iset 9 000A CHO1 4 Press w key to select lt Range gt setting and press Enter Then press w key to select LOW RANGE and press Enter to confirm NO y P LOW RANGE CHO1 5 Press V key to select the rise slope setting lt f gt and press Enter For 1A us input 1 and press Enter to confirm RISE PAR UOS BAND 1 00A Us CHO1 6 Press V key to select the fall slope setting lt f gt and press Enter For Fall Speed Set 2A us input 2 and press Enter to confirm 2 00A Us CHO1 7 Press w key to select A level setting lt TRANa gt and press Enter For m 10A input 10 and press Enter to confirm Transition yi p i Level 10 00A CHO1 8 Press w key to select A width setting Ta and press Enter For 0 002s input 002 and press Enter to confirm Tran Aion p p i 0 0025 f CHO1 9 Press w key to select B level setting lt TRANb gt and press Enter For 2A T
6. A ed ERAS 71 Remote OperatiOn minis nen erae o Eee e ce asks eren oer Nen ne ner et rene eee code 71 USB Interface ist io tee ers en n aer Eee e need ee ee aee Vernon AN menton sn eni seat EE Ye duis aea eai 72 Ethernet Interface eerie erar eva tes euo n ege un e ca aov uera beu New T usn date aundscesessceceseudesdavendecee 72 GPIB Interface cin Do EXP eoa xr ea bea enge cates aa CREE doses ss 72 R5 232 Interface sise iren tarde need dent GUAE KK i TUNER NE VER 73 R 232 Data FOEFImal oo riore Eee A REESE ENSE Se EP EROS es PERS AGO ne anne EE ORE Re ai 73 Ba d Rate iii ete rideo tuviese ette Ed 73 Panty td ATRAS RE 73 RSE232 Flow Conttrol et e S ces 74 R 232 COnrieCLIOF IS 2 cicero temas rte dede not tin t e ke o DEIA da Aaa 74 RS 232 Tro bleshootilig eR rer deu aiiud A 75 Communication Settirig eo eter corna eSI Ann eo Se SEE EORR SERRE PSU CEP CENE 75 Specifications oo cceecevve aia 70 Supplementary Characteristics eie eere se enhn en na ae aene e eee E YE SY RE EE SE ss ceas acecssccsessdensesees 78 SERVICE INFORMATION oes dont sn e aha gu res yo oe ya ves e aL as E aversi vue 79 LIMITED THREE YEAR WARRANTY sssccesccssccssccsccccccscscsscessessessees OO Product Overview This section describes the main features and menus of the MDL Series DC Electronic Load The MDL Series is comprised of two parts mainframes and modules The mainframes mentioned are the MDLO0O1 mainframe and th
7. and provide better accuracy in your measurement Figure 12 illustrates a typical connection between module and device for remote sense operation Figure 12 Remote Sense Connection 31 There are two input connectors One is the electronic load s input measurement terminal and the other is the Vsense measurement terminal When Vsense is connected to device to be measured the electronic load will switch to Vsense mode automatically There is no need to change a setting in the menu and the front panel of the module will show sense CAUTION The electric potential on the positive terminal of Vsense connector must be higher than the negative terminal Parallel Connection Parallel connection can be applied between modules of the same model to increase current and power dissipation but it cannot be applied between different modules Modules can be paralleled in CC CR or CW mode but cannot be paralleled in CV or CZ mode Each module will dissipate the power it has been programmed at For example after being paralleled two single channel modules rated at 80V 40A 300W can dissipate up to 80V 80A 600W Figure 13 illustrates the paralleled connection for increased power dissipation am janja a ja j L 1 mjs cod LJ 33r aout ae i ie ERE Figure 13 Parallel Module Connection 32 Mainframe 8 pin Control Connector The mainframe s 8 pin control terminal on the rear panel is shown below This is used for e
8. confirm 6 Press V key to select the rise slope setting lt f gt Input value and press Enter key to confirm CC mode only 7 Press w key to select the fall slope setting lt f gt Input value and press Enter key to confirm CC mode only 8 Press Esc key to exit 9 Press On Off key to turn on the load s input 44 VFD Display Self test CHO1 CC OFF Vdc 0 0000V Adc 0 0000A Wdc 0 00W CHO1 Mode CC RANGE HIGH Iset 9 000A CHO1 HIGH RANGE LOW RANGE CHO1 Const Current Set 1 25A CHO1 Rise Speed Set 1 00A Us CHO1 Fall Speed Set 2 00A Us CH1 CC ON Vdc 0 0000V Adc 0 0000A Wdc 0 00W Local Operation Mainframe Panel The front panel keys are effective only in the local mode When the load is powered on it works in local mode automatically unless any of the remote interfaces are connected to a device controlling it and then you can select channel number and set parameters such as voltage or current via the front panel keys When the load is repowered on the mainframe will scan all the installed modules once again and can recall the parameters from the last time it was powered off D t VA NL FN TN N Y 7 OO OO OO OO QOO OO Figure 22 MDLOO1 Mainframe Front Panel 1 VFD DISPLAY When powering on the VFD screen will light up and show the instrument s firmware version Then the system will begin power on self test ch
9. constant voltage CV constant current CC constant resistance CR constant power CW or constant impedance CZ All panel operation and programming functions are carried out on the MDLOO1 mainframe panel A wide range of dynamic loading applications can be simulated through user programmable slew rates load levels duration and conducting voltage Features e CC CV CR CW CZ operating modes e Removable modules for easy system flexibility e Bright VFD display for both mainframe and modules e Power range up to 2400 W 4800 W with mainframe extension e Supports up to 16 channels with mainframe extension e Operate identical modules in parallel mode for high current applications e Synchronous load on off function e 16 bit voltage and current metering providing high resolution of 0 1 mV and 0 01 mA e Transient mode up to 25 kHz e List mode sequence mode minimum 20 us step width with 84 user programmable steps e Adjustable slew rate in CC mode e Automatic test function e 101 memory areas to save recall setting parameters e Analog current control and monitoring e Remote sensing e Standard LAN GPIB USBTMC compliant USB and RS 232 interfaces with SCPI protocol support e OVP OCP OPP OTP and reverse voltage protection Front Panel 1 2 3 4 5 6 7 8 Figure 1 MDL Series Front Panel VFD DISPLAY Displays electronic load information MODULE PANEL KEYS Controls module
10. 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 e NONE No flow control Flow control options are stored in non volatile memory RS 232 Connections The RS 232 serial port can be connected to the serial port of a controller i e personal computer using a straight through RS 232 cable terminated with DB 9 connectors Do not use a null modem cable Figure 33 shows the pinout for the connector If your computer uses a DB 25 connector for the RS 232 interface you will need a cable or adapter with a DB 25 connector on one end and a DB 9 connector on the other It must be a straight through not null modem cable S P AM e e 9876 5 Figure 33 RS 232 Connector Pinout Pin Signal Description 1 NC No Connection 2 TXD Transmit Data 3 RXD Receive Data 4 NC No Connection 5 GND Ground 6 NC No Connection 7 CTS Clear to Send 8 RTS Ready to Send 9 NC No Connection RS 232 Troubleshooting If you are having trouble communicating over the RS 232 interface check the following e The computer and the electronic load must be configured for the same baud rate parity number of data bits and flow control options Note that the electronic load is configured for 1 start bit and 1 stop bit these values are fixed
11. e The correct interface cables or adapters must be used as described under the RS 232 connector Note that even if the cable has the proper connectors for your system the internal wiring may be incorrect e The interface cable must be connected to the correct serial port on your computer COM1 COM2 etc and the correct 9 pin serial port on the mainframe Communication Setting Before communicating please make sure that the following parameters of the electronic load match that of the PC You can enter the System menu Shift D to make any changes Baud rate 9600 5800 9600 19200 38400 57600 115200 Data bit 8 Stop bit 1 Parity None None Even Odd Local address O 0 through 31 default setting is 0 NOTE When communicating with a PC you can only use one communication interface at a time 75 Specifications Modei motzoo wouzsz _mo1302 wo130s wotano mo1s0s misoo eee i ff oa p a 0 18 V Range ES 0 80 V 0 80 V 0 80 V o 500v o8ov o soov 0 80 V 1mV Resolution o 0 0 moe 0 05 0 02 FS Mos rer panis 0 05 0 02 FS Accuracy High 0 05 0 025 FS CC Mode ne ee es oam oam im oim orma im orm 0 05 0 05 FS 0 05 0 1 FS Accurac 0 05 0 05 FS 0 1 0 1 FS CR Mode 0 05 9 109 0 059 100 0 050 10Q 0250 3100 0 05031000 0 20 100 0203100 ange 10 Q 7 5 kQ c 16 bit ow 0 01 0 08 S Accuracy 0 01 0 0008 S 20
12. functions Refer to Module section for more details on the use of these keys ADJUSTMENT KNOB Used to change parameters MAINFRAME FUNCTION KEYS Controls each channel s operating status Refer to Mainframe section for more details on the use of these keys MAINFRAME NUMERIC ENTRY AND SHIFT KEYS Refer to Mainframe section for more details on the use of these keys POWER SWITCH Turns the system on or off MAINFRAME MODULES 10 Rear Panel 1 2 3 4 5 6 7 8 9 2g ORS 881 333 Figure 2 MDL Series Rear Panel GPIB interface Input terminal of module Remote measurement and external input control terminal Current monitoring output Digital I O and VF output terminal Extended module interface AC Power input socket USB interface Line voltage selection switch 110V 220V 10 Trigger 1 O and load on off terminals 11 LAN interface 12 RS 232 interface 13 Not used for factory use only 11 Protection Functions The electronic load has the following protection functions Overvoltage protection OVP overcurrent protection OCP overpower protection OPP overtemperature protection OTP and local and remote reverse voltage protection LRV RRV The mainframe will act appropriately once any of the above protections are active You can press any button on the front panel to restore the protection function For example if the electronic load triggers the overtemperature protection the b
13. gt mask address lt Mask set gt and port lt port set gt GPIB Interface First connect GPIB port of electronic load to GPIB card of PC There must be sufficient contact Tighten the screws and then set the address The address can be set from 0 to 31 Press Shift D key to enter the System menu Select lt Communication gt and choose lt GPIB gt The electronic load operates from a GPIB address set from the front panel To set the GPIB address press w key to select lt GPIB Address gt Input the address and press Enter key to confirm The GPIB address is stored in non volatile memory 72 RS 232 Interface Use a cable with two COM interfaces DB9 to connect the electronic load and PC It can be activated by selecting lt RS 232 gt in lt Communication gt of the System menu NOTE There are two COM interfaces on the rear panel of the MDLOO1 mainframe the left 9 pin COM interface is the RS 232 communication interface and the right 9 pin COM serial port connection is not for use All SCPI commands are available through RS 232 programming The EIA RS 232 standard defines the interconnections between data terminal equipment DTE and data communications equipment DCE The electronic load is designed to be a DTE and 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 Shift D on the front p
14. levels when transient operation is turned on Constant Impedance CZ Mode In this mode the electronic load uses an A D converter to sample and a built in DSP calculation to simulate the transient current wave of the tested components Circuit principle is as follows Figure 21 Constant Impedance Mode 42 Ranges When working in CZ mode you can press the Setup key to enter the RANGE menu Two overlapping ranges can be selected LOW RANGE or HIGH RANGE Impedance can be edited in either of the two ranges Low range will supply higher accuracy and better resolution when you set lower impedance If any value you set is outside the maximum value of the LOW RANGE you should select HIGH RANGE If the electronic load is in remote control mode you can use the IMP RANG command to switch impedance range Vmax Vmin Limits These parameters refer to the voltage high and low limit for the automatic test mode During automatic test mode the device under test DUT must be operating within the configured values for the test to PASS upon completion If the DUT operates outside the configured values the test will FAIL upon completion Note These parameters are used for Automatic Test ONLY Immediate Impedance level Set the impedance level via the front panel If the load is in CZ mode the new impedance level setting immediately changes the input If the load is not in CZ mode the impedance level setting will be saved for use until mode is s
15. m un O This key can be used to exit any working state This key is used for decimal O A y These keys are used to move up and down the menu selection Enter This key is used to confirm selection Shift This key is used to enter other menus and functions Shift O Press this key combination to enter the System menu System Shift Press this key combination to enter the Configuration menu Config Shift O Press this key combination to enter the Program menu Program Shift 0 l Local Press this key to switch the electronic load to local mode when in remote sense mode oca hift s Press this key to lock the module s panel keys and knob Repress the button to unlock Lock 4 POWER SWITCH This switch turns the electronic load on or off 47 Module Panel Figure 23 Module Front Panel 1 VFD DISPLAY Bright VFD display shows module s operating mode 2 ROTARY KNOB Used to change parameter values 3 PANEL KEYS Key Description A B tch A Bt t t value aie nel modules Switch A B transient preset value L R Switch the left right channels Press this key rotary knob to control dual channel modules the two channels Used for short testing This allows the load to simulate a short circuit shor at the input Mode Switches the operating mode CC CR CV CW or CZ Move t
16. overlapping ranges can be selected LOW RANGE or HIGH RANGE Resistance can be edited in either of the two ranges Low range will supply higher accuracy and better resolution when you set lower resistance If any value you set is outside the maximum value of the LOW RANGE you should select HIGH RANGE If the electronic load is in remote control mode you can use the RES RANG command to switch resistance range Vmax Vmin Limits These parameters refer to the voltage high and low limit for the automatic test mode During automatic test mode the device under test DUT must be operating within the configured values for the test to PASS upon completion If the DUT operates outside the configured values the test will FAIL upon completion Note These parameters are used for Automatic Test ONLY Immediate Resistance Level Set the resistance level via front panel or by sending SCPI command RES lt n gt If the load is in CR mode the new resistance level setting immediately changes the input If the load is not in CR mode the resistance level setting will be saved for use until mode is switched to CR mode Transient Resistance Level A B transient resistance level can be set on front panel or by remote operation The load can continuously toggle between the two levels when transient operation is turned on Constant Power CW Mode In this mode the electronic load will consume a constant power When input voltage increases the input current wil
17. state on the RMA the performance problem and return any leads probes connectors and accessories that you are using with the device Non Warranty Service Please go to the support and service section on our website at www bkprecision com to obtain an RMA Return the product in the original packaging to the address below Clearly state on the RMA the performance problem and return any leads probes connectors and accessories that you are using with the device Customers not on an open account must include payment in the form of a money order or credit card For the most current repair charges please refer to the service and support section on our website Return all merchandise to B amp K Precision Corp with pre paid shipping The flat rate repair charge for Non Warranty Service does not include return shipping Return shipping to locations in North America is included for Warranty Service For overnight shipments and non North American shipping fees please contact B amp K Precision Corp B amp K Precision Corp 22820 Savi Ranch Parkway Yorba Linda CA 92887 www bkprecision com 714 921 9095 Include with the returned instrument your complete return shipping address contact name phone number and description of problem 79 LIMITED THREE YEAR WARRANTY B amp K Precision Corp warrants to the original purchaser that its products and the component parts thereof will be free from defects in workmanship and materials for a period of three ye
18. transient mode or create a pulse in dynamic pulse mode At the same time it will output a trigger signal on pin 2 To use BUS trigger mode first set the trigger source as BUS Connect the electronic load by GPIB USB or Ethernet communication interface When the TRIG command is received the load will produce a trigger signal To use timer trigger mode first set the trigger source as TIMER Set the TRIGGER TIMER s time and the electronic load will trigger at specified trigger timer setting and also produce a trigger signal on rear Trigger Out pin To use hold trigger mode first set trigger source as HOLD Then send the TRIG IMM command to trigger the electronic load Pin 2 of 8 pin Control Connector on the rear will also output a corresponding trigger signal when the electronic load receives the TRIG IMM command 34 External ON OFF Control Connection ON OFF IN pin 3 of rear 8 pin Control Connector is used to toggle the multi channel electronic load inputs ON or OFF When ON OFF IN pin receives a TTL level pulse gt 10us the ON OFF state of the load will toggle SYNC ON SET function can be set to ON for multiple channels to toggle more than one channel at a time ON OFF OUT pin 4 of rear 8 pin Control Connector indicates ON OFF state of the multi channel electronic load If SYNC ON SET function of any specific channel is set to ON and the channel s input state is ON pin 4 outputs a low TTL level signal If the input state is
19. 0 W 250 W 300 W 300 W 400 W 500 W 600 W Resolution 10 mw Accuracy 0 2 0 2 FS 76 Model moe moizs2 moia02 mo130s wbiaoo misos mbisoo Femme Transient Mode CC mode T1 amp T2 20us 3600s Res 5us 10ms Accuracy 5us 100ppm Lo 0001 0 25 0 0001 0 2 0 0001 0 25 0 0001 0 1 0 0001 0 25 O pos 0 1 0 0001 0 25 A us A us A us A us A us A us Slew Rate O p 2 5 0 yo 2 5 O p 2 5 Accuracy m 4096 of NUN m Measurement Readback voltage 0 18 V 0 18 V 0 18 V 0 18 V 0 18 V 0 18 V 0 18 V Range E ae 0 80 V 0 80 V 0 80 V 0 500 V 0 80 V 0 500 V 0 80 V eee 0 025 0 025 FS Readback current Accuracy 0 05 0 05 FS m Readback power Range 200W 250W 300W 300W 400W 500W 600 W Resolution Accuracy 0 2 0 2 FS Protection Range typical ee ac General typical Current CC pee Col 4 oa sox E E 120A Voltage Voltage CV Resistance CR 220 m0 150 m0 pra Te 300 ka 300 ka 1MO 300 ka 1 MO 300 kQ Impedance Notes 1 MDL252 User can allocate up to 250 W to either channel up to 300 W total e g 50 W 250 W 250 W 50 W 150 W 150 W 2 Fast pulse trains with large transitions may not be achievable 3 The slew rate specifications are not warranted but are descriptions of typical performance The actual transition time is defined as the time for the input to change from 10 to 90 or vice versa of the programmed current values In case of very large load changes e g fr
20. 18 Configuration Menu Press Shift key to enter the channel Configuration menu MENU SYNC ON SET Setup Synchronization ON OFF function ON DEFAULT Turn on synchronization function OFF Turn off synchronization function VON VON POINT Set the load s Von point VON LATCH Von latch state ON DEFAULT Turn on Von latch OFF Turn off Von latch EXIT Exit the menu AVERAGE Average count setting 2 X adjustable from 2 2 to 2 16 COUNT VAUTORANGE Auto switching voltage range ON DEFAULT Enable this function OFF Disable this function PROTECT Load protecting function MAX POWER SET Set up hardware power protection state ALIMIT STATE Set up software current protection state o Turn en software current protection state Turn off software current OFF DEFAULT protection state ALIMIT POINT Set up software current protection value ALIMIT DELAY Set up software current protection delay PLIMIT POINT Set up software power protection value PLIMIT DELAY Set up software power protection delay ON TIMER STATE Set up LOAD ON timer state ON TIMER SET Set up LOAD ON timer time EXIT Exit the menu LIST FUNCTION MODE Select mode FIXED Choose fixed operation mode LIST Choose list operation mode RECALL LIST Recall list operation file 19 EDIT LIST Edit list operation file HIGH RANGE Edit high range of list operat
21. BK la oy go i VE rie WiTiViv MDL Series Programmable DC Electronic Load Models MDLO01 MDLOO2 MDL200 MDL252 MDL302 MDL305 MDL400 MDL505 MDL600 USER MANUAL ms E OO omo Q Y LI B d a 4 s s h e 7 E be wc LI e e e e e m 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 assume 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 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 mains power through a grounded power cable with the ground wire firmly c
22. D pIriqyeee M 8 Features ee M 9 A 10 Rear Panel e e m di eE aaO Eae 11 l dde iziodie ila Died Dice 12 Overvoltage Protection OVP orina ri at 12 Overcurrent Protection OCP ii tees caves tevaswentonavomncianneens 12 Overpower Protection OPP cccccccccsssssssssssceceecccecssssssssceceescceceaessessceseesscecenssesseeeeseees 14 Overtemperature Protection OTP csssssssssscececcccscssssssesceccesccecessssseseeeesccacensssssseeeseees 15 Reverse Voltage Protection LRV RRV sssssssssssssssssssssssssssssssssssssssesssesssssssssssesssesssesesennne 15 Men A O 16 S UDRUNIE 16 Configuration MENU mec 19 Automatic Test mE 20 Installation cocina s reae ars o epa aae pae os pases sess ZL IMIS POCTION 6 21 nn RE UE ease 21 Installing Modules iii ita 22 AA scdcicd dentveccdendcesetsvdovcesducsetentecanseddedsscetsvcdusesdedie ctewesseusssdevestevescdvsscesee esses 24 LOCATION APA PU O O 25 INPUT Voltage SLE CHOON iii nai as 27 Turn On a A O 28 If the Electronic Load Does Not Turn On esssessssssessseesssecssecosecosseesssessescsescseecssecosecosesesseessse 29 Load Connection sisi sera obs esti do
23. E Load works in CZ mode CC CV RANGE Switch the range HIGH RANGE Set high range LOW RANGE Set low range I V R WSET Set the working current voltage resistance power value Vmax Amax Set up the maximum voltage current limit for Automatic test mode Vmin Amin Set up the minimum voltage current limit for Automatic test mode J 2 500A us Set the rising slew rate only in CC mode J 2 500A us Set the falling slew rate only in CC mode TRAN A 0 00A Set up level A value Ta 0 0005S Set up level A width TRAN B 0 00A Set up level B value Tb 0 0005S Set up level B width T MODE Set up the transient mode CONTINUOUS Continuous mode PULSE Pulse mode TOGGLE Toggle mode RLC R 7500 00 Set up the resistance value RLC L 0uH Set up the inductance value RLC C 10uF Set up the capacitance value EXIT Exit the setup menu 16 System Menu Press Shift D key to enter the System menu MENU INITIALIZE INITIALIZE DEFAULT SET Resume all configuration to default settings POWER ON SET RST DEFAULT Set the load s input state to default at power on SAVO Set the load s input state to SAVO at power on BUZZER SET Set up the buzzer state ON Enable the function OFF DEFAULT Disable the function LOAD ON KNOB Module knob mode setting UPDATE DEF Real time update OLD No update when turning load ON OFF original value before use of rotary knob will be set TRIGGER SOUR Set
24. Function Description The detailed illustration of the VFD and all indicator functions are as follows Figure 24 Load Module VFD Panel L R is the indicator of the dual channel module s left right channel If you want to edit left right channel parameters first select the channel using the L R key Single channel module will always display R OFF indicates that the module input is off When module input is enabled OFF indicator will turn off CC CV CR CW CZ indicates the module s operating mode VFD display screen shows four lines of numbers The first line shows the measured voltage value The second line shows the measured current value The third line shows the measured circuit s power value The fourth line shows the setup value and users can set A V Q value here Short is displayed when short circuit function is enabled on the module Tran is displayed when TRANSIENT mode is enabled on the module List is displayed when selecting LIST mode in the Configuration menu Sense is enabled in remote sense function There is no need to set this in the menu as you only need to link the circuit to remote sense terminals and Sense will be displayed 50 Transient Operation Transient operation enables the module to periodically switch between two load levels as might be required for testing power supplies Transient operation can be turned on and off from the front panel Tran and T
25. GE you should select HIGH RANGE If the electronic load is in remote control mode you can use the VOLT RANG command to switch voltage range Amax Amin Limits These parameters refer to the current high and low limit for the automatic test mode During automatic test mode the device under test DUT must be operating within the configured values for the test to PASS upon completion If the DUT operates outside the configured values the test will FAIL upon completion Note These parameters are used for Automatic Test ONLY Voltage Level Set the voltage level on front panel or by sending SCPI command VOLT lt n gt If the load is in CV mode the new setting immediately changes the input If the electronic load is not in CV mode the set voltage level will be saved in the instrument for use until the mode is switched to CV mode Transient Voltage Level A B transient voltage level can be set on front panel or by remote operation The electronic load can continuously toggle between the two levels when transient operation is turned on Constant Resistance CR Mode In this mode the electronic load is equivalent to a constant resistance as shown below The electronic load will linearly change the current according to the input voltage Slope Resistance Load Setting Current Load Input Voltage V Figure 19 Constant Resistance Mode 40 Ranges When working in CR mode you can press the Setup key to enter the RANGE menu Two
26. Limit Delay 3S 6 Press Esc key to exit menus If the electronic load s power value is above the set overpower protection value the electronic load will automatically turn off and the VFD will display OPP At the same time the OP and PS bits in the status register will be set and remain until they are reset 14 Operations to Clear the OPP State Check whether the input power is within the rated power range or the programmed protection ranges If it is outside the range disconnect the device under test Then press any key on the front panel or remotely send command PROTection CLEar The OPP displayed on the front panel will turn off and the electronic load exits OPP protection state Overtemperature Protection OTP Each module has an overtemperature protection circuit which will turn off the input if the internal temperature exceeds safe limits When the electronic load s internal circuit temperature is over 85 C the load will enable OTP Input will automatically be turned off and the VFD will display OTP At the same time the OT and PS bits in the status register will be set and remain until they are reset Operations to Clear the OTP State When the electronic load temperature has dropped below the protection point press any key on the front panel or remotely send command PROTection CLEar The OTP displayed on the front panel will turn off and the electronic load exits OTP protection state Reverse Voltage Protec
27. MER CHO1 CC OFF 4 If electronic load is on press On Off key to turn off the electronic Vdc 0 0000V load s input Adc 0 0000A Wdc 0 00W 5 Press Shift to enter Configuration menu Press w key to select FUNCTION MODE re RECALL LIST lt List gt and press Enter Press w key to select lt Edit List gt and press EDIT LIST Enter EXIT 6 Press A y key to select high range or low range and press Enter to High Range confirm Low Range CS i List file step 7 Input number of steps in List Input value and press Enter to confirm _ 5 8 Set first step s current level Input value and press Enter key to confirm Step 001 level 1A 9 Set first step s slew rate Input value and press Enter key to confirm Step 001 rate 0 5A us 10 Set first step s width time Input value and press Enter key to confirm Step 001 width 6S 11 Set second step s current level Input value and press Enter key to confirm Step 002 level 2A 12 Set second step s slew rate Input value and press Enter key to confirm Step 002 rate 0 1A us 57 13 Set second step s width time Input value and press Enter key to Step 002 width confirm 5S 14 Set parameters for steps 3 through 5 in the same manner described above Repeat Count 15 Set number of run cycles Input value and press Enter to confirm CHO1 16 Select memory position to save list file Inpu
28. P menu of the front panel under the Vmax Vmin CC CR CW CZ mode or Amax Amin CV mode parameters Users must set Pass Fail criteria for each mode used in the Automatic test sequence before running the automated test Configuring Instrument Settings The automatic test runs a program that uses the settings stored into the internal EEPROM memory Each program can run 10 sequences and each of these sequences is correlated to instrument settings that are stored within a designated group of internal EEPROM memory They are designated according to the table below 66 Table 4 Save Table PROGRAM 1 1 2 3 4 5 6 7 8 9 10 Sequence Save Group 1 2 3 4 5 6 7 8 9 10 AO 1 2 3 4 5 6 7 8 9 10 Sequence Save Group 11 12 13 14 15 16 17 18 19 20 PROGRAM 3 1 2 3 4 5 6 7 8 9 10 Save Group 21 22 23 24 25 26 27 28 29 30 PROGRAM 4 1 2 3 4 5 6 7 8 9 10 Sequence Save Group 31 32 33 34 35 36 37 38 39 40 SALE 1 2 3 4 5 6 7 8 9 10 Sequence Save Group 41 42 43 44 45 46 47 48 49 50 PROGRAM 6 1 2 3 4 5 6 7 8 9 10 Sequence Save Group 51 52 53 54 55 56 57 58 59 60 PAE 1 2 3 4 5 6 7 8 9 10 Sequence Save Group 61 62 63 64 65 66 67 68 69 70 ROSAS 1 2 3 4 5 6 7 8 9 10 Sequence Save Group 71 72 73 74 75 76 77 78 79 80 PROGRAM 9 1 2 3 4 5 6 7 8 9 10 Sequence Save Group 81 82 83 84 85 86 87 88 89 90 AE 2 3 4 5 6 7 8 9 10 Sequence Save Group 91 92 93 94 95 96 97 98 99 100
29. anel to enter the System menu if you need to change the settings RS 232 Data Format The RS 232 data is a 10 bit word with one start bit and one stop bit Parity None Start Bit 8 Data Bits Stop Bit The number of start and stop bits are not programmable However the following parameters are selectable in the System menu using the front panel Shift D key Baud Rate The System menu lets you select one of the following baud rates which are stored in non volatile memory 4800 9600 19200 38400 57600 or 115200 Parity None eight data bits without parity Even seven data bits with even parity Odd seven data bits with odd parity 73 RS 232 Flow Control The RS 232 interface supports the following flow control options 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 e CTS RTS 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 e XON XOFF When the input queue of the electronic load becomes more than full the instrument issues an X OFF command The control program should respond to this and stop sending characters until the electronic load issues the X ON which it will
30. ars from date of purchase B amp K Precision Corp will without charge repair or replace at its option defective product or component parts Returned product must be accompanied by proof of the purchase date in the form of a sales receipt To help us better serve you please complete the warranty registration for your new instrument via our website at www bkprecision com Exclusions This warranty does not apply in the event of misuse or abuse of the product or as a result of unauthorized alterations or repairs The warranty is void if the serial number is altered defaced or removed B amp K Precision Corp shall not be liable for any consequential damages including without limitation damages resulting from loss of use Some states do not allow limitations of incidental or consequential damages So the above limitation or exclusion may not apply to you This warranty gives you specific rights and you may have other rights which vary from state to state B amp K Precision Corp 22820 Savi Ranch Parkway Yorba Linda CA 92887 www bkprecision com 714 921 9095 80 BK EFMCIMAN Pt wield 22820 Savi Ranch Parkway Yorba Linda CA 92887 www bkprecision com 2015 B amp K Precision Corp Printed in China v011315
31. as the time for the input to change from 10 to 90 or 90 to 10 of the programmed current values The graph below illustrates slew rate measurements 38 Voltage Current or Resistance Change i 1 i 1 Measured Time Actual Time Figure 17 Slew Rate Measurement Between the 10 and 90 region the slew rate can be measured by observing the steepest slope portion In case of very large load changes e g from no load to full load the actual transition time will be larger than the expected measured time For this reason the firmware allows the user to program slew rate values outside of the specified slew rate ranges The minimum transition time for all programmable slew rates is also limited in cases where the transition from one setting to another is very small due to bandwidth limitations of the load 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 Load Volt Setting Input Voltage Load Current Figure 18 Constant Voltage Mode 39 Ranges When working in CV mode you can press the Setup key to enter the RANGE menu Two overlapping ranges can be selected LOW RANGE or HIGH RANGE Voltage can be edited in either of the two ranges Low range will supply higher accuracy and better resolution when you set lower current If any value you set is outside the maximum value of the LOW RAN
32. clean the external case parts Do not attempt to clean internally N WARNING To prevent electric shock please unplug the power cord connected to the unit before cleaning 21 Installing Modules CAUTION Static electricity may damage load modules Please install modules according to standard electrostatic prevention Avoid touching joints and circuit boards One can install any combination of modules up to 2400 W total in the MDLOO1 mainframe in any order This also applies to the MDLOO2 mainframe extension allowing a maximum of 4800 W total when connecting the MDLOO1 and MDLOO2 together The procedure of installing modules to the mainframe extension is the same as that of the MDLOO1 mainframe Installation Procedure 1 Turn the mainframe off and disconnect the power cord 2 Loosen screws on front panel plastic cover and remove from mainframe Figure 3a Module Installation 3 Remove plastic cover on rear with flat blade screwdriver 22 Figure 3b Module Installation 4 Insert and slide the selected modules into the slot Figure 3c Module Installation 5 Insert and tighten module screws on rear panel 23 Figure 3d Module Installation 6 Install more modules in other slots following the same process steps 2 through 5 7 Reconnect the power cord C
33. ction current ranges If it is outside the range disconnect the device under test Then press any key on the front panel or remotely send SCPI command PROTection CLEar The OCP displayed Overpower Protection OPP The electronic load includes both hardware and software OPP features Hardware OPP In the event that the electronic load s input power exceeds the set power protection limit the hardware OPP will limit the power Once the hardware OPP is triggered the status register s OP bit will be set When the hardware OPP is removed the status register s OP bit will be reset Hardware overpower protection will not turn the electronic load s input off Software OPP Users can set the electronic load s software OPP value with the following steps Panel Operations VFD Display 1 Power on the electronic load Self test 2 Press Shift to enter Configuration menu Sync On Set Von Meter Protect List Ext Ctrl Set About Exit 3 Press w key to select Protect and press Enter to go into protection menu Max Power Set Alimit State Alimit Point Alimit Delay Plimit Point Plimit Delay OnTimer State OnTimer Set Exit 4 Press w key to select lt Plimit Point gt and press Enter Input OPP power value and press Enter to confirm Power Limit Set 210 00W 5 Press V key to select Plimit Delay and press Enter Input delay time before alarm and press Enter to confirm Power
34. d on off time 22 Set condition for when to stop testing COMPLETE means to stop test when all steps are completed FAILURE means to stop test when testing fails Press A w keys to select condition and press Enter to confirm Stop Condition Complete Failure 23 Program chain is used when you need to link to the next file to be tested For example if you need to link to group 2 press 2 If you do not need to link to another file input 0 and then press Enter key to confirm Program Chain NO 2 24 Save the edited files into the EEPROM Up to 10 program files can be saved For instance press 1 to save the edited file to program file 1 and then press Enter to confirm Save Program NO 1 25 Press Esc key to exit menu Run Program Recall Prog Edit Program Exit 70 Recall Test Files The following is a procedure on how to recall edited test files from the EEPROM Panel Operations VFD Display 1 Press Shift 9 to enter the Program menu Run Program Recall Prog Edit Program Exit 2 Press V key to select Recall Prog and press Enter Input the saved program number and press Enter to recall the saved testing file Program Select NO 1 3 To run the program press A key to select Run Program and press Enter PROG 01 Stop Result 4 Press Start key to start automatic testing If you need to pause press Pause key and then press w key to cont
35. e MDLOO2 mainframe extension Modules in this series include the MDL200 MDL252 MDL302 MDL305 MDL400 MDL505 and MDL600 Unless otherwise noted this document will refer to all of these instruments as electronic load The range of each module s specific voltage current and power is listed in the Specifications section Description The MDL Series is a multi channel programmable DC electronic load system With programming and remote control capabilities the MDL Series DC electronic load can provide multiple solutions according to the requirements of your design and is suitable for testing a wide range of power sources from multi output DC power supplies to batteries fuel cells and photovoltaic arrays Up to four modules can be installed into the MDLOO1 mainframe to support up to a total of 8 channels Adding the MDLOO2 mainframe extension will enable the system to support four additional module slots for a maximum of 16 channels The electronic load is configured by installing user selectable modules into the mainframe and operated using the front panel keypad and rotary knob It can also be controlled remotely via USB RS 232 LAN or GPIB interface The electronic load modules all have similar functions but may differ in range of input voltage current and power The high resolution voltage and current measurement system provides both accuracy and convenience The electronic load can be used in one of five different operation modes
36. e and terminals of the electronic load In order to ensure testing accuracy the electronic load provides a pair of remote sensing terminals in the rear panel where users can sense the output terminal voltage of the connected device Users should set the electronic load in REMOTE SENSE mode before using this function On the rear terminals SENSE and SENSE are the remote sensing inputs By eliminating the effect of the voltage drop in the load leads remote sensing provides greater accuracy by allowing the electronic load to regulate directly at the source s output terminals see Figure 12 External Analog Control You can control the current setting of the electronic load in CC mode using the external analog programming terminal pin 7 and pin 8 A 0 10 V input signal will simulate O full scale of the electronic load to regulate the input current of the electronic load 10 V indicates the full range of electronic load s current rating Automatic Test The automatic test function of the MDL Series electronic load is useful for simulating various tests and allows the user to edit up to 10 program files Each file has 10 steps and up to 100 steps can be edited and saved into the EEPROM Convenient for production environments automatic test can cascade sequences across multiple channels and allows setting of Pass Fail P F criteria Setting Up Test Files Configuring Pass Fail Parameters The Pass Fail criteria can be found in the SETU
37. eck all the installed modules of the load and display every channel s number voltage and current measurements 45 2 FUNCTION KEYS Key Description Chan This key is used to switch channels Every module has its own channel number and can be selected from the mainframe panel This key is used to save parameters After selecting a channel and editing its parameters Save press the Save key to save your settings into non volatile memory Up to 101 groups of parameters can be saved Recall This key can be used to quickly recall a saved group of parameters from memory This key is used to enter the specific channel s menu For example pressing this key allows Setup you to set up A B transient mode and CC CV CR CW CZ mode For more details view the Menu List section This key is used to turn the module s input state on or off When the synchronization function On Off in the channel menu is enabled pressing this key can control the on off state of all channels Tri This key is used to trigger the electronic load Select the Manual Trigger mode to use front 8 panel triggering Start This key is used to start an automatic test Pass This key is used to pause an automatic test The VFD will display pausing at each step Press u the key again to test the file continuously 46 3 ENTRY SHIFT KEYS Description D These are number input keys 69 9 9 9 GJ x C565 63 3 7
38. eed 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 product Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met Compliance Statements Disposal of Old Electrical amp Electronic Equipment Applicable in the European Union and other European countries with separate collection systems This product is subject to Directive 2002 96 EC of the European Parliament and the Council of the European Union on waste electrical and electronic equipment WEEE and in jurisdictions adopting that Directive is marked as being put on the market after August 13 2005 and should not be disposed of as unsorted municipal waste Please utilize your local WEEE collection facilities in the disposition of this product and otherwise observe all applicable requirements CE Declaration of Conformity The DC electronic load meets the requirements of Low Voltage Directive 73 23 EEC and Electromagnetic Compatibility Directive 89 336 EEC amended by 93 68 EEC Low Voltage Directive N61010 1 2001 EMC Directive EN50081 1 EN50082 1 Table of Contents Safety SUMMA did iii Z Compliance Steed Product OVGIVIEW e
39. em TR Li Ta Iu Crea D NT CLA Figure 31 Terminals on Single Channel Module Rear Panel 64 Table 3 Module Terminal Pinout Pin Signal Description 1 GND Ground 2 VF Voltage fault indication terminal 3 DI Digital input terminal 4 DO Digital output terminal Q OUT Current monitoring output 5 SENSE Voltage remote measuring terminal 6 SENSE Voltage remote measuring terminal 7 EXT PRG External analog controlling terminal 8 EXT_PRG External analog controlling terminal Voltage Failure Indication When the electronic load is under OVP or reverse protection condition pin 2 VF will output a high level signal Current Monitoring The current monitoring terminal will output 0 10 V analog signal accordingly to O full range of the input current You can connect an external voltmeter or an oscilloscope to display the input current s change Digital 1 0 Digital 1 0 is pin 3 and pin 4 shown in Figure 31 and only used in remote control The digital input terminal pin 3 can detect a high low level signal The digital output terminal pin 4 can output a TTL high low level signal It is a universal output terminal and can be used to control an external instrument 65 Remote Sense Function When working in CC CV and CR mode if the electronic load consumes a very large current it will cause a voltage drop in the leads between the connected devic
40. hannel Number The channel number for all modules is determined by the location of the modules in relation to the mainframe and ordered from right to left With the MDLOO1 mainframe the total number of channels is 8 Channels 1 and 2 are next to the mainframe front panel while channels 7 and 8 are located on the left side Load channel number is fixed even if the location is unoccupied Dual channel modules such as the MDL252 and MDL302 have two channels If it is a single channel module the channel number is automatically assigned the first number of the slot Figure 4 shows the default channel number order 8 7 6 5 4 3 2 1 Figure 4 Channel Number Distribution 24 The following figures show examples of how channels are assigned when single channel and dual channel modules are installed Figure 5 Channel Number Order When Installing Four Single Channel Modules 8 7 6 5 3 i Figure 6 Channel Number Order When Installing Two Single Channel Modules and Two Dual Channel Modules Note Mainframe extension module channels are numbered 11 18 Location The operating temperature of the MDL Series DC Electronic Load is 0 to 40 C A fan cools the electronic load by drawing air through both the top and front and then exhausting it out the back Therefore the electronic load must be installed in a location that allows sufficient space on the front and back of the unit for adequate air circulation Minimu
41. he cursor position Press key to move the cursor to the position 4 you want to edit and then use the rotary knob to adjust value 48 Selects the transient mode Press this key first to enable transient Tran mode before running A B transient operation and then send the triggering signal to run a program On Off Control module s input on off state 4 AIR INLET Module s air inlet for cooling purposes JAN WARNING Do not place any objects that may block or cover air inlet Module Panel Lock Press Shift key to lock current channel s keys and knob operation To unlock press Shift key again Switching Channels There are three ways to switch channels 1 Press Chan number key 2 Press Chan vw key 3 Press the number key of the channel in SETUP menu Channel Synchronization If you want to change the synchronization of the channels you can set this in the Configuration menu Switch to the channel on the mainframe and then press Shift key to enter the Configuration menu Select and enter the lt SYNC ON SET gt submenu Select lt ON gt or lt OFF gt and press Enter When you turn on this function the On Off key can control the input state of the corresponding module synchronously In the same method you can set up synchronization with other channels When in remote control mode you can send SCPI command INPut ALL ON to synchronously load all channels 49 VFD Indicator
42. inue Remote Operation There are four types of communication interfaces available USB Ethernet GPIB and RS 232 You can choose any one of them to communicate with a PC RS232 sf dg TELS SETS PAELLA j ie LL LS b 10 Ethernet Figure 32 Mainframe Rear Panel Communication Interfaces 71 USB Interface Use Type A to Type B USB cables to connect the electronic load and the PC All electronic load functions are programmable over the USB Press Shift D on the front panel to enter the System menu Select lt Communication gt and choose lt USBTMC USB488 gt The USB488 interface capabilities of the electronic load are described below e The interface is IEEE 488 2 standard USB488 interface e The interface accepts REN_CONTROL GO_TO_LOCAL and LOCAL_LOCKOUT requests e The interface accepts MsglD TRIGGER USBTMC command message and forwards TRIGGER requests to the function layer The USB488 device capabilities of the electronic load are described below e The device understands all mandatory SCPI commands e The device is SR1 capable e The device is RL1 capable e The device is DT1 capable Ethernet Interface Use a network cable to connect PC through Ethernet interface of the electronic load Press Shift D on the front panel to enter the System menu Select lt Communication gt and choose lt ETHERNET gt Then select lt Ethernet Set gt to set gateway address lt Gateway Set gt IP address lt IP Set
43. ion LOW RANGE Edit low range of list operation EXT CTRL SET External analog control function ON Turn on external analog control function OFF DEFAULT Turn off external analog control function REM SENSE SET Remote sense function ON Enable remote sense function OFF DEFAULT Disable remote sense function ABOUT Module production information MDL Channel production model SN f Channel production serial number HHHHHHHHHHHHHHHHHH VER 1 35 Channel software version EXIT Exit the menu Automatic Test Menu Press Shift 9 key to enter the program menu PROGRAM RUN PROGRAM Run the testing file RECALL PROG Recall the testing file EDIT PROGRAM Edit the testing file EXIT 20 Installation Inspection This instrument was carefully inspected before shipment Upon receipt inspect the instrument for damage that might have occurred during transit If any sign of damage is found please notify your B amp K Precision distributor The following standard and optional accessories are provided with each mainframe or module Mainframes include e Power cord e User manual e Mainframe extension cable accessory MDLOO2 only Modules include e Certificate of calibration and test report Optional accessories Rack mount kit IT E153A available for mainframes MDLOO1 and MDLOO2 Cleaning Use a dry cloth or one slightly dampened with water to
44. irst 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 the power source you plugged the electronic load into is energized Then check to see 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 factory Change the line voltage setting if it is not correct 3 Verify that the correct power line fuse is installed If fuse is blown please replace it according to the following specification Table 1 Fuse Table Product Fuse specification 110VAC Fuse specification 220VAC MDLOO1 T5A 250V T2 5A 250V MDLOO2 T5A 250V T2 5A 250V 4 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 and then replace with matching fuse Figure 10 Fuse Location 29 Load Connection WARNING To satisfy safety requirements load wires between the electronic load and the device under test DUT should have a current rating high enough not to overheat while carrying the short circuit output current Never make connections between the electronic load and a DUT while the electronic load inputs are turned ON and or the DUT has live power at its output Before connecting the device to be mea
45. l decrease while power P V 1 will remain the same V L Power setting Input y2 voltage yx l2 11 Load current Figure 20 Constant Power Mode 41 Ranges When working in CW mode you can press the Setup key to enter the RANGE menu Two overlapping ranges can be selected LOW RANGE or HIGH RANGE Power can be edited in either of the two ranges Low range will supply higher accuracy and better resolution when you set lower power If any value you set is outside the maximum value of the LOW RANGE you should select HIGH RANGE If the electronic load is in remote control mode you can use the POW RANG command to switch power range Vmax Vmin Limits These parameters refer to the voltage high and low limit for the automatic test mode During automatic test mode the device under test DUT must be operating within the configured values for the test to PASS upon completion If the DUT operates outside the configured values the test will FAIL upon completion Note These parameters are used for Automatic Test ONLY Immediate power level Set the power level via the front panel If the load is in CW mode the new power level setting immediately changes the input If the load is not in CW mode the power level setting will be saved for use until mode is switched to CW mode Transient power level A B transient power level can be set via the front panel or by remote operation The electronic load can continuously toggle between the two
46. lets you generate complex sequences of input changes on a single channel 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 The parameters of List operation include the name number of steps 2 84 step width time 20us 3600s and every steps set value and slew rate The list file can be saved in non volatile memory where it can be quickly recalled Users can edit up to 7 groups of List files in CC mode only In List operation mode the electronic load begins to enable the List operation when it receives the trigger signal and will continue until the List operation is completed or the instrument receives another trigger signal List Sequence Trigger I I i i i Oo 1 2 3 A4 5 e m List count 1 List count 2 Figure 28 List Mode Current Waveform Setting Up List Operation Mode The following is a quick tutorial of how to set up List Mode for your electronic load Panel Operations VFD Display 1 Power on the electronic load Self test 56 CHO1 CC ON Vdc 0 0000V 2 Press A v keys to select the channel to be edited Adc 0 0000A Wdc 0 00W MANUAL 3 Press Shift D to enter System menu Press W key to select EXTERNAL lt Trigger source gt and press Enter Select lt Manual gt and press Enter HOLD to confirm BUS TI
47. m clearances for bench operation are 2 inches from the top and 3 inches from the front and back If there are radiator fans in your 25 cabinet please avoid installing the load near the fan since it may limit air circulation of the load If you are installing equipment on top of your electronic load in the cabinet use a filler panel above the unit to ensure adequate air circulation The MDL Series can be placed in a standard 19 inch rackmount shelf Rack mount kit IT E153A is available for use with mainframe MDLOO1 and mainframe extension MDLOO2 When mounted there is no need to remove the bottom studs CAUTION Do not block the fan exhaust at the rear of the load When the load is used on a bench make sure there is enough space on the front and rear of the equipment for air circulation Mainframe Size WE 11 E hup Bus un Rug y emus sos nues X mmn MDL001 Mainframe MDL002 Mainframe Extension Figure 7 MDLOO1 and MDLOO2 Outline Diagram The MDLOO2 mainframe extension has the same dimensions as the MDLOO1 mainframe 26 Figure 8 Module Outline Diagram Note Dimensions are in millimeters mm Input Voltage Selection The electronic load can work under 110 220V 10 AC input identified by an input line voltage switch on the rear refer to Figure 9 If the indicated line voltage does not match your region please use the switch in the back of the unit to choose
48. ns Figure 25 shows the current waveform of continuous transient operation mode 51 2 0ms 3 0ms TRIG Figure 25 Continuous Transient Operation Current Waveform Pulse In this mode the electronic load generates a transient pulse of programmable width when pulse transient operation is in effect In pulse mode you can set A B level A B width and A B slew rate via the mainframe keypad The electronic load will automatically switch to A level after maintaining A width time Then it will switch to B level The electronic load will not switch to A level again until the instrument receives the pulse signal The following figure shows the current waveform in pulse transient operation SA TWD i TWD il 10ms Pi TRIG TRIG Figure 26 Pulse Transient Operation 52 Toggle In toggle mode the electronic load will switch between A level and B level when receiving a trigger signal after the transient operation is enabled The following picture shows the current waveform in toggle transient operation TRIG TRIG Figure 27 Toggle Transient Operation Setting Up A B Transient Operation The following is a short tutorial of how to set up A B transient operation for your electronic load In this example we will set up rise speed at 1 A us and fall speed at 2 A us The electronic load will be in continuous transient mode and switch between 10 A and 2 A in durations of 0 002 s and 0 003 s respectively Note
49. off pin 4 outputs a high TTL level signal Mainframe Extension Connection i Y e om ou ff Mainframe s p n d a E U RS A Dd i Extension ES amer eme mr mara Mainframe Extension Interface Mainframe Figure 15 Mainframe Extension Connection This interface is used to connect the mainframe extension to expand the number of channels Up to 16 total channels can be supported when mainframe is connected to the mainframe extension Procedure 1 Use expansion cable to connect the mainframe extension interface between the mainframe and mainframe extension 2 Press Shift D to enter System menu Use v keys to navigate through menu 3 Select Expand module and choose ON to enable expand function Press Enter to confirm 35 PC Control Connection The MDL Series DC Electronic Load can achieve remote control via USB RS 232 LAN or GPIB interface but only one interface can be used at a time Choose the interface via the System menu Shift D Connect communication cable before powering on Do not hot plug as it may damage the communication interface of the electronic load The following procedure shows how to connect the RS 232 cable between the electronic load and PC Procedure 1 Au PWD Connect RS 232 cable Power on the electronic load Select channel number via A w keys Enter System menu by pressing Shift D Use A v keys to navigate through menu
50. om no load to full load the actual transition time will be larger than the expected time The load will automatically adjust the slew rate to fit within the range high or low that is closest to the programmed value 77 Supplementary Characteristics Memory capacity 101 Groups Recommended calibration period Once per year AC Input selectable by switch on the rear panel Option 1 220 V 10 50 60 Hz Option 2 110 V 10 50 60 Hz Cooling method Fan cool Environmental conditions This instrument is intended for indoor use in a pollution degree 2 environment Environmental limits are as follows Operating temperature O to 40 C Storage temperature 10 to 60 C Humidity Indoor use lt 95 Dimensions and weight Model Type Dimensions W x H x D Weight MDLOO1 Mainframe 445 x 183 x 549 mm 15 4 kg MDLOO2 sleet 445 x 183 x 549 mm 15 4 kg MDL200 Module 82 x 183 x 573 mm 5 kg MDL252 Module 82 x 183 x 573 mm 5 kg MDL302 Module 82 x 183 x 573 mm 5 kg MDL305 Module 82 x 183 x 573 mm 5 kg MDL400 Module 82 x 183 x 573 mm 5 kg MDL505 Module 82 x 183 x 573 mm 5 kg MDL600 Module 82 x 183 x573 mm 5 kg 78 SERVICE INFORMATION Warranty Service Please go to the support and service section on our website at www bkprecision com to obtain an RMA Return the product in the original packaging with proof of purchase to the address below Clearly
51. onnected 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 Alternating current Both direct and alternating current Protective earth ground terminal Attention refer to accompanying documents gt 6D dl 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 proc
52. r to the voltage high and low limit for the automatic test mode During automatic test mode the device under test DUT must be operating within the configured values for the test to PASS upon completion If the DUT operates outside the configured values the test will FAIL upon completion Note These parameters are used for Automatic Test ONLY Immediate Current Value Set the current level via front panel or by sending SCPI command CURR lt n gt If the load is in CC mode the new current level setting immediately changes the input at a rate determined by the slew rate If the load is not in CC mode the current level setting will be saved for use until mode is switched to CC mode Transient Current Level A B transient current level can be set on the front panel or by remote operation The load can continuously toggle between the two levels when transient operation is turned on Set Slew Rate The current slew rate determines the rate at which the input current to a module changes to a new programmed value You can set the current level s rise fall slew rate on the front panel or by remote operation The programmed slew rate is immediately in effect to the triggered and transient current level changes Slew Rate Measurement and Actual Transition time Current slew rate is defined as the change in current over time A programmable slew rate allows a controlled transition from one load setting to another The actual transition time is defined
53. ransition B input 2 and press Enter to confirm ID ODA CHO1 10 Press V key to select B width setting Tb and press Enter For 0 003s input 003 and press Enter to confirm Trane Wig PERS P l 0 0035 CHO1 11 Press w key to select transient operation mode Tmode and press Continuous Enter Select Continuous and press Enter key to confirm Pulse Toggle 54 12 Press Esc key to exit CHO1 CC OFF Vdc 0 0000V Adc 0 0000A Wdc 0 00W 13 Press Shift D to enter System menu Press w key to select lt Trigger source gt and press Enter Select lt Manual gt and press Enter to confirm MANUAL EXTERNAL HOLD BUS TIMER 14 Press Esc key to exit CHO1 CC OFF Vdc 0 0000V Adc 0 0000A Wdc 0 00W 15 Press On Off key to turn on the electronic load s input CHO1 CC ON Vdc 0 0000V Adc 0 0000A Wdc 0 00W 16 Press Tran key on channel 1 module to enable transient operation 17 Press Trig key on mainframe panel to trigger transient operation Transient Operation Programming Example If in remote control mode you can use the following example commands for transient operation refer to MDL Series Programming Guide for more information CURRent TRANsient MODE CONTinuous CURRent TRANsient ALEVel 10 CURRent TRANsient AWIDth 0 2ms CURRent TRANsient BLEVel 2 CURRent TRANsient BWIDth 0 3ms TRANsient ON TRIGger IMMediate 55 List Operation List mode
54. rig keys Before you turn on the operation you should set the parameters associated with the transient operation The parameters include A level A width B level B width and transient testing modes There are three different transient testing modes continuous pulse and toggle Continuous Generates a respective pulse stream that toggles between two load levels Pulse Generates a load change that returns to its original state after some time period Generates a repetitive pulse stream that toggles between two load levels Toggle It is similar to continuous mode except that the transient points are controlled by explicit triggers instead of an internal transient generator Continuous In this mode the electronic load generates a repetitive pulse stream that toggles between two load levels Load could switch the state between two value settings value A and value B In CC mode transient testing can be used to check the stability of the source voltage Transient functions have two current levels A level B level which should be in the same range high range or low range You can set the A B level delay time and the rise fall slew rate via the mainframe keypad The slew rate determines the rate at which the level changes Press Trig key and the load will continuously switch between the A B levels preset Transient loads are usually used to test the power supply s performance under continuous changing load conditio
55. s Select lt Communication gt and select lt RS 232 gt Press Enter to confirm Now the display will return to main menu Select lt RS 232 Set gt and press Enter In this menu you can set the values for baud rate parity and handshake using A w keys and Enter key See Menu List for full listing of menus and submenus applicable to all other remote interfaces 36 Operation Operating Modes The electronic load can work in the following modes 1 Constant current CC operation mode 2 Constant voltage CV operation mode 3 Constant resistance CR operation mode 4 Constant power CW operation mode 5 Constant impedance CZ operation mode 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 Load Current Setting Current gt Load Input Voltage V Figure 16 Constant Current Mode Ranges When working in CC mode you can press the Setup key to enter the RANGE menu Two overlapping ranges can be selected LOW RANGE or HIGH RANGE Current can be edited in either of the two ranges Low range will supply higher accuracy and better resolution when you set lower current If any value you set is outside the maximum value of the LOW RANGE you should select HIGH RANGE If the electronic load is in remote control mode you can use the CURR RANG command to switch current range 37 Vmax Vmin Limits These parameters refe
56. sest beseccsc tes SU Remote Sense Connection ccccsesccccsscccccceccesceccenescnssceceseccccceccccecceneccceseesesesesensceaseceaeses 31 Parallel COMNGCE PER 32 Mainframe 8 pin Control Connector eeee eee ee ee eese eene eene eene nennen nnn snnt nnne 33 3ccur Mic RU up cM 34 External ON OFF Control Connection csssscccssssscececcssssceccssscececceseececcecesceccaussceceecesesceeees 35 Mainframe Extension Connection ccccccsccsccsccecscceccececceccececceccecscceccececceccececceccececcsccececcecs 35 PC Control Connection 5 coi co ine da eee ca cmn va eoa see ae ad dr ass 36 Operation me Y Operating Modes etie otia eM e ture rec dune ere aca REED EN 37 Constant Current CC mode oorr net nent 37 Constant Voltage CV Mode 0 ed rl hon dp obo VOR OH VETERA 39 Constant Resistance CR Mode Renania TUER 40 Constant Power CW Mode chos sx rA CE ERER E M RN AREA AAA VR 41 Constant Impedance CZ Made ee rra M vein quoe emi oru Pav n ERR d RR ee UE LER 42 Setting CV CC CR CW CZ Models tte dde En ribeires PRAE ide 44 Local OpGEatlon cni imei Rode RS cedent ee 45 Mainframe Panta EE ES 45 Module Pani Mete pr ro 48 Module Panel LOCK c 49 Switching Channels is drea int insecte 49 Channel Synchronization iii a e A ne 49 VED Indicator Function Description
57. short current is 120 of the current range In CV mode short means setting the load s constant voltage to be O V In short operation mode you can measure the maximum short current Amax or DC current ADC of the power source to be measured You can set this function via the Configuration menu When in remote control mode you can send SCPI command INPut SHORt ON to enable the short operation 60 Input On Off Operation During front panel operation press the On Off key to switch the input on off state Input On Off operation will not affect the present settings The load unload speed of On Off operation is not dependent on the rise fall slew rate When in remote control mode you can send SCPI command INPut ON to turn the input on refer to MDL Series Programming Guide for more information on remote commands Von Operation The Von voltage value can be set to control the voltage turn on state for the electronic load When the input voltage exceeds the Von voltage value the electronic load s input state turns on This function can protect a DUT when its voltage goes below a specified level For example when testing a power supply s discharge you can set the voltage level for the power supply to begin and end discharging There are two different modes of Von operation set by the Von LATCH parameter When Von LATCH is disabled the electronic load will begin sinking current if input voltage exceeds Von voltage When the inpu
58. sured to the electronic load please remove the cover on the output terminals of the load and cover it after completing the connection Please pay attention to the type length and polarity when wiring Avoid using wires of minimum specification of heating which are unable to supply good load regulation Generally speaking if the wires are short enough they can control a voltage drop of less than 0 5 V In addition bonding them together can reduce induction and noise Connect wire from positive terminal of module to positive terminal of device Similarly connect the corresponding negative terminal Figure 11 illustrates a typical connection of the module with the device to be measured oe e E Sal EE ME E F Fg us HARAS B ee bro _ Figure 11 Connection of Load and Device Under Test DUT 30 There are two positive terminals and two negative terminals on the rear panel of every module Single terminal connection is adequate when the input current is less than 30 A needed when the input current is more than 30 A Refer to Figure 11 Connection of f WARNING Each terminal can carry up to 30 A current Double terminal connection is Load and Device Under Test DUT for double terminal connection Remote Sense Connection If the lead length is relatively long there will be a voltage drop in the leads connected between load and measured object Remote sensing can compensate for this condition
59. t value and press Enter S Save list file to confirm 17 Press A key to select Function Mode and press Enter Select Fixed List and press Enter to confirm List 18 Press Esc key twice to exit menus CHO1 CC ON f Vdc 0 0000V 19 Press On Off key to turn on the electronic load s input Adc 0 0000A Wdc 0 00W 20 Press Trig key to trigger List mode operation 58 List Mode Programming Example If in remote control mode you can refer to the following example to edit List operation refer to MDL Series Programming Guide for more information Command Function LIST RANGe 40 Sets List range LIST COUNT 10000 Sets List cycle LIST STEP 2 Sets List steps LIST LEVEL 1 5 Sets List step 1 level LIST SLEW 1 2 Sets List step 1 slew rate LIST WIDTH 1 1 Sets List step 1 width LIST LEVEL 2 1 Sets List step 2 level LIST SLEW 2 2 Sets List step 2 slew rate LIST WIDTH 2 2 Sets List step 2 width LIST SAV 2 Saves List to file 2 LIST RCL 2 Recalls List file 2 FUNCTION MODE LIST Sets List mode function TRIG SOUR BUS Sets trigger source TRG Runs List file Note This example programs a list on a MDL200 module For other models make sure all range level slew and transient width parameters are within the modules specified limits 59 Triggered Operation Trigger Function Trigger operation can be used in the following operations transient pulse output triggered output and list output The elec
60. t voltage drops below the Von voltage value the electronic load will stop sinking current and the input will turn off LOAD SINE CURRENT EAS RISE RATE Afus Fall Rate A uS t Figure 29 Von LATCH Load s Working Range 61 When Von LATCH is enabled the electronic load will begin sinking current if input voltage exceeds Von voltage When the input voltage drops below the Von voltage value the electronic load will still continue to sink current and the input remains on Yon LOAD SINK CURRENT he RISE RATE Asus t Figure 30 Von LATCH Load s Working Range Setting Up Von Function The following is a quick tutorial of how to set up the Von function for your electronic load In this example we will set the Channel 1 Von point to 5 V and enable Von latch Panel Operations VFD Display 1 Power on the electronic load Self test CHO1 CC OFF Vdc 0 0000V 2 Select channel to be set up Press 1 for channel 1 dc 0 0000A Wdc 0 00W 3 Press Shift to enter Configuration menu Press w to select p PRES lt Von gt and press Enter Meter 62 Von Point 4 Select lt Von Point gt and press Enter Von Latch Exit Von Point Set 5 Set the Von Point Input 5 and press Enter to confirm le 5V 6 Press V to select Von Latch gt and press Enter Set on off state On Select On and press Enter to confirm Off 7 Press Esc key twice to exit menus
61. tep of Vdc 0 0000V channel 5 repeat steps 3 through 6 with desired parameters Adc 0 0000A Wdc 0 00W 9 After editing the first step of channel 5 press Esc key to exit the menu 10 Save the edited first step of channel 3 and channel 5 Press Save Save Group and to save step 1 Press Enter to confirm 1 11 In the same manner you can edit the rest of the steps for channel 3 and channel 5 by repeating steps 2 through 10 above These saved groups correspond to sequences that will be selected in your program below 68 12 Press Shift 9 key to enter the Program menu Press W key to select Edit Program and press Enter Run Program Recall Prog Edit Program Exit 13 The MDL Series with mainframe extension can support a maximum of 16 channels O represents the MDLOO1 mainframe and 1 represents the MDLOO2 mainframe extension 07050301 indicates channels 1 3 5 and 7 have been equipped with electronic load modules Active Channel 0 07050301 1 14 Select the channels to be tested For instance if you want to select channels 3 and 5 press number keys 3 and 5 Y denotes the channel is selected If you want to cancel a channel press the number key again to cancel Then press Enter to confirm your selection Active Channel 0 07050301 1
62. tion LRV RRV This function protects the electronic load in case the input DC voltage lines are connected with the wrong polarity When a reverse voltage LRV local reverse voltage RRV remote reverse voltage connection condition is detected the input will immediately turn off the buzzer will alarm the user and the status register s reverse voltage LRV RRV and VF bits will be set The mainframe will display LRV RRV until they are reset In this condition the 8 pin connector s VF pin will output a high level You can disconnect the power supply via this signal see Figure 31 Operations to Clear the Reverse Voltage State Check whether the connection is reversed If so disconnect the device to be measured and the reverse voltage state will be cleared 15 Menu List The following menus can be viewed on the VFD display Use A w keys to scroll through the menu list and press Enter key to enter the selected menu function Use A vw keys to scroll through the VFD screen and press Enter key to enter its submenu Press Esc to go back to the previous menu selection Pressing number keys can directly select a channel Setup Menu Press Setup key to enter the setup menu SETUP MODE Select working mode CONST CURRENT Load works in CC mode CONST VOLTAGE Load works in CV mode CONST RESISTANCE Load works in CR mode CONST POWER Load works in CW mode CONST IMPEDANC
63. tronic load has five kinds of trigger modes to synchronously trigger the tested instrument Before enabling the trigger function users should first select trigger source Trigger Source 1 Manual trigger When manual trigger mode is active pressing the Trig key on the front panel will enable a trigger operation 2 External trigger signal TTL level The 1 pin of the 8 pin connector on the rear panel of the mainframe is the trigger input terminal When an external trigger signal is available input a low pulse gt 10us to the input and the load will enable a trigger operation 3 Hold trigger When hold trigger is used the load will enable a trigger operation only when the load receives the TRIG IMM trigger command from the communication port 4 Bus trigger When bus trigger is set the load will enable a trigger operation as soon as the load receives the trigger command GET or TRG 5 Timer trigger When timer trigger is set the mainframe will enable a trigger operation periodically Short Operation The electronic load can simulate a short circuit at its input During front panel operation press the Short key to switch the short on off state Short operation will not affect the present setting When turning off the short state the load returns to the original set state The actual value of the electronic load in short operation depends on the mode and range that is active when the short is turned on In CC or CR mode the maximum
64. up the trigger mode MANUAL DEF Manual trigger EXTERNAL External signal trigger mode HOLD Hold trigger mode BUS Bus trigger mode TIMER Timer trigger TRIGGER TIMER Trigger timer setting TRIGGER TIMER SET Set the time of the trigger timer COMMUNICATION Select the interface for remote communication RS232 DEF USBTMC USB488 GPIB ETHERNET RS232 SET BAUDRATE SET Set up the communication baud rate 4800 DEFAULT 9600 19200 38400 57600 115200 17 RS232 SET PARITY SET Set up the communication parity NONE DEFAULT ODD EVEN HANDSHAKE SET Select the handshake protocol NONE DEFAULT CTS RTS XON XOFF GPIB ADDRESS GPIB address setting GPIB ADDRESS SET Set up communication address ETHERNET SET Ethernet settings GATEWAY SET Gateway setting IP SET IP setting MASK SET Mask setting PORT SET Port setting EXIT EXPAND MODULE Module expansion ON Enable the function OFF DEFAULT Disable the function LANGUAGE SET Communication protocol SCPI DEFAULT SCPI protocol EXTEND TABLE Expand SCPI protocol compatible with others ABOUT Mainframe production information MDL Mainframe production model number con Mainframe production serial number HHHHHHHHHHHHHHHHHH VER 1 43 Mainframe software version EXIT
65. uzzer will alarm the input will automatically turn off and the mainframe VFD will display OTP Overvoltage Protection OVP If the OVP circuit has triggered input will turn off buzzer alarm will go off and the status register s OV and VF bit will be set The mainframe will display OVP and the condition will remain until they are reset Once overvoltage protection occurs the 8 pin 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 see Figure 31 Operations to Clear the OVP State Check whether the input voltage is within the electronic load s rated voltage or the programmed protection voltage ranges If it is outside the range please disconnect the device under test Then press any key on the front panel or remotely send SCPI command PROTection CLEar The OVP displayed on the front panel will turn off and the electronic load exits OVP protection state Overcurrent Protection OCP The electronic load includes both hardware and software overcurrent protection features Hardware OCP The electronic load s maximum input current will be limited to approximately 110 of the current range Once the hardware OCP is triggered the status register s OC bit will be set When the hardware OCP is removed the status register s OC bit will be reset Hardware overcurrent protection will not affect the electronic load s on off state Soft
66. ware OCP Users can set the electronic load s software OCP value with the following steps 12 Panel Operations VFD Display 1 Power on the electronic load Self test 2 Press Shift to enter Configuration menu Sync On Set Von Meter Protect List Ext Ctrl Set About Exit 3 Press V key to select Protect and press Enter to go into protection menu Max Power Set Alimit State Alimit Point Alimit Delay Plimit Point Plimit Delay OnTimer State OnTimer Set Exit Press W key to select lt Alimit State and press Enter Select On and press Enter to confirm On Off Default 5 Press V key to select Alimit Point and press Enter Input OCP current value and press Enter to confirm Current Limit Set 40 000A 6 Press V key to select Alimit Delay and press Enter Input delay time before alarm and press Enter to confirm Current Limit Delay 3S 7 Press Esc key to exit menus Operations to Clear the OCP State Check whether the input current is within the electronic load s rated current or the programmed on the front panel will turn off and the load exits OCP protection state If the electronic load s current value is above the set overcurrent protection value the electronic load will automatically turn off and the VFD will display OCP At the same time the OC and PS bits in the status register will be set and remain until they are reset prote
67. witched to CZ mode You should select the channel to be edited before setting impedance parameters Press the SETUP button to enter CZ mode After choosing the high low range the front panel will display the following CHO1 Rset 7500 0 Q Ymax 82V Ymin 0V Rset set the impedance value Ri Vmax set maximum voltage pass fail limit for Automatic test mode Vmin set minimum voltage pass fail limit for Automatic test mode RLC R set the series resistance value Rs RLC R 7500 0 RLC L 0uH RLC C 10uF RLC L set the series inductance value Ls RLC C set the parallel capacitance value Ci 43 Setting CV CC CR CW CZ Mode The following procedure will show you a basic example of how to set up your operation mode from the front panel Panel Operations 1 Power on the electronic load Press 4 y keys to select the channel to be edited such as channel 1 3 Press Setup key to enter the channel setup menu press Enter key to enter the lt Mode gt selection menu and press W key to select CV CC CR CW or CZ mode Press Enter key to confirm 4 Press w key to select lt Range gt selection menu Press Enter key to enter the lt Range gt selection menu and press W key to choose lt Low Range gt or lt High Range gt Press Enter key to confirm 5 Press V key to select the voltage setting lt Vset gt current setting lt Iset gt resistance setting lt Rset gt power setting or impedance setting and press Enter key to
68. xternal trigger and ON OFF control connections SAGOGONA Figure 14 Mainframe Rear Panel 8 pin Control Connector Table 2 Control Connector Pinout Pin Signal Description 1 Trigger IN Trigger Signal Input 2 Trigger OUT Trigger Signal Output 3 ON OFF IN Synchronization ON OFF Control Signal Input 4 ON OFF OUT Synchronization ON OFF Signal Output 5 NC No Connection 6 NC No Connection 7 GND Ground 8 GND Ground 33 External Trigger Connections There are five kinds of trigger modes 1 2 3 4 5 Front panel TRIG trigger mode Rear panel trigger mode BUS trigger mode Timer trigger mode Hold trigger mode Setting these modes is done through the System menu Shift D under lt Trigger Source gt Press Enter to confirm setting and Esc to exit menu Trigger Modes 1 2 3 4 5 To use front panel trigger mode first set the trigger source as MANUAL Press Trig to start panel trigger mode To use rear panel trigger mode first set the trigger source as EXTERNAL Inputting a TTL level pulse gt 10 us to the trigger signal input pin 1 of mainframe s Mainframe 8 pin Control Connector on the rear panel will enable a trigger operation The following figure shows one way to produce a trigger signal When making contact with a TTL pulse source it produces a trigger to change the setting value voltage current resistance etc e g switch in
69. your input line voltage install appropriate fuse refer to Table 1 Fuse Table below and then insert power cord N CAUTION Check to make sure correct fuse is installed when line voltage is switched 27 input line voltage switch Figure 9 Input Voltage Selection Turn On Checkout When you turn on the electronic load the front panel display will light up briefly while the electronic load performs its power on self test The following table shows the procedure of the self test Mainframe VFD Display Description BOIS Ver 1 20 VFD displays software version SYSTEM SELF TEST System self check CH1 2 3 4 5 6 7 8 SCAN Detecting all installed modules 07050301 e g CHO1 CV OFF Vdc 0 0000V Adc 0 0000A Wdc 0 00W Displays information of channel 1 or the leftmost channel Use up and down key to select other channels WARNING Your electronic load is equipped with a 3 wire grounding type power cord the third conductor being ground The electronic load is grounded only when the power line cord is plugged into an appropriate receptacle Do not operate your power supply without adequate cabinet ground connection 28 If the Electronic Load Does Not Turn On Use the following troubleshooting steps to help solve problems you might encounter when turning on the instrument 1 Verify that there is AC power to the electronic load F

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