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MDL Series Programmable DC Electronic Load

1. 8 Features ge 9 ELO PA MNT UL Te 10 Rear Pad M 11 Protection FUNCTIONS 0 lt ccicceeccecescncsevccsecseuesseseevececcctescecceveccossusseesccndsvecssedscvacsccectsccessneossuveseresaues 12 Overvoltage Protection OVP rn NANA 12 Overcurrent Protection OCP A iia 12 Overpower Protection OPP seriada satis nn 14 Overtemperature Protection OTP ssssssssceccccccccsssssssseeceeccescansssssscecessccacaassssssseeseseeaoenes 15 Reverse Voltage Protection LRV RRV ee esee esee eene eene nennen nenne nnn nn nnn n nona n anna 15 Men Ec 16 SSUPBEBSNIURE 16 Configuration MENU me 19 Automatic Test MOCNU m 20 STAN ATION el AAPP O 21 a UU PPP A Sn A 21 Installing Modules ii a ie mb ie 22 AA cdcict divtveccdendewtersccoccesdvcsecentscuusstcedssscdevdsceesdeue cdeuesvcusssdevssdevesedessecseses vcvece 24 LOCATION PA A oooO sean ss si sms sacs ini is 25 INPUT Voltage Selec M ia 27 Turn On CHECKOUT issn ssccssccccssscdvavstevesccodssovessstentesensceadescavedeceves dese sveueasssuansdvesd suede seven gene even Ve PE es ones 28 If the Electronic Load Does Not Turn On
2. 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 IMPEDANCE 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 value maximum current value Vmin Amin Set up the minimum voltage value minimum current value 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
3. 64 Digital m NN 64 Remote Sense FUNCION 3 en eee eis a tic 65 External Analog Control ici e Fk nega gea Qu sux Ee A A Na P Cpu ERN EK di A 65 Automatic NOSE SEI D ER 65 Setting lad mee Ai 65 Recall Test FES cici O 70 Remote OperatiOn eorr tree one eene ceste EE Ears Se Cosa Eurer doo teca eee aSa Eon ESEESE 70 USB lriterface ec e E Re eset rao ce Suen rn Sa eae Ee e Va ewe Eae cia SEE Rene d see RES E Ve NE ii CEN ER Eee RUE 71 Ethernet Interface cesos o eria e th va Fen aae eu decanos tho decada caian ea Ese eo dorado edo dn consu aen Pak siste 71 GPIB Interface inicia iii a ia 71 RS 232 REIS PEE TRTCITETOTETRIITT TITOLI LI 72 RS 232 Data Format Lee item a a RNE Dream IRE EVE RU RE RR titat EFE FU ciat 72 Ba d Ratera tit eerte denne etuer doeet uten eres ete pet feste eene mt irt deri els 72 cine T 72 RS 232 Flow Control a A E 73 R9723 2 CONNECTCOM S neenon ieia iaai a ETT TDI T 73 RS 232 Tro bleshootllig Ia id 74 COMMUNICATION Settirig o eaen co vena eSI meta mitat maco E SENE oS Co us ACE URN ES ERREUR cec 74 Specifications uo covevelvev vea ado Supplementary Characteristics lee aee se eere eh n ae Roa e eene asi ze S NY ao dana Ke Ve Cedo tesis te ee 77 SERVICE INFORMATION dox tae en voe a aoa epa trans inca o oe Vu pE Sn La oso eoa Urea LO LIMITED THREE YEAR WARRANTY ssscccsccscccscccsccecccscccsscecs
4. Modules include e Certificate of calibration and test report Optional accessories Rack mount kit IT E153 available for MDLOO1 and MDLOO2 Cleaning Use a dry cloth or one slightly dampened with water to 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 of ool LP 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
5. Save the edited files into the EEPROM Up to 10 groups of files can be saved For instance press 1 to save the edited file in group 1 and then press Enter to confirm Save Program NO 1 15 Press Esc key to exit menu Run Program Recall Prog Edit Program Exit 16 Select the channel you want to edit and then edit every group s step We selected channel 3 and channel 5 above Press A y keys to switch channel to 3 CH03 CC OFF Vdc 0 0000V Adc 0 0000A Wdc 0 00W 67 17 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 the CC CV or CR mode Every step s mode can be edited Press Enter key to confirm MODE CC RANGE HIGH Iset 1 00A 18 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 19 Press V key to move the cursor to Vmax 82 000V and press Enter You need to set the upper limit of testing voltage In this example the first step is 5 8V Press S O and then Enter to confirm Voltage Upper Limit 5 800V 20 Press V key to move the cursor to Vmin 0 000V and press Enter You need to set the lower limit of testing voltage In this Voltage Lower example the first step is 0 15V Press O and then Enter Limit 0 150V to confirm
6. 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 panel to enter the System menu if you need to change the settings RS 232 Data Format The RS 232 data is a 10 bit vvord vvith 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 E
7. Shift This key is used to enter other menus and functions Shift Press this key combination to enter the System menu System Shift Press this key combination to enter the Configuration menu Config Shift Press this key combination to enter the Program menu Program Shift 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 46 Module Panel JUG 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 ls channel imodufes 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 CZ Move the 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 47 Selects the transient mode Press this key first to enable transient Tran mode before runni
8. 21 After editing the first step of channel 3 press Esc key to exit the menu CHO5 CC OFF 22 Press A v keys to select channel 5 To edit the first step of Vdc 0 0000V channel 5 repeat steps 17 through 20 Adc 0 0000A Wdc 0 00W 23 After editing the first step of channel 5 press Esc key to exit the menu 24 Save the edited first step of channel 3 and channel 5 Press Save Save Group and D to save step 1 Press Enter to confirm 1 25 In the same manner you can edit the rest of the steps for channel 3 and channel 5 by repeating steps 17 through 24 above Make sure the correct group number is being saved for the corresponding sequence in your program 68 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 PROGRAM Z 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 8
9. 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 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 T
10. Terminals on Single Channel Module Rear Panel 63 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 PRGt 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 I O Digital I O is pin 3 and pin 4 shovvn in Figure 31 and only used in remote control The digital input terminal pin 3 can detect a high lovv level signal The digital output terminal pin 4 can output a TTL high lovv level signal It is a universal output terminal and can be used to control an external instrument 64 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 device and terminals of the electronic load In order
11. sssssssssssssessseecsseccsecosecesseesssessesssescseecssecosecosssesssessse 29 Load Connection nus Remote Sense Connection sssssssssssssssssssssssssssssssssosssosssossssssssssssessssssssssssosssosssossssssseosssessssesss 31 i e RN 32 Mainframe 8 pin Control Connector cLeeeeee eese eese ee eene eene eene n enne nnn nones annees aser nnn 33 External Trigger ConnectiONnS iii ida 34 External ON OFF Control CONNe ction ssscccccsssssceccsssscecccceceececcessscecceussceccccesesceccecsececsecsseees 35 Mainframe Extension Connections cccceccscecceccccecceccccecceccececcescecescuccsceccuccsceccusesceccuscscessuses 35 PC Control Connection 5 rni eo rie eia ene ea dadeacdecascucesdudcav acussucesdwicuctocassucescuisncdocdseucsscncenctocuseucevets 36 Operati N in acci H e Operating MOdes 1 a a dile A ueber den E eere can 37 Constant Current CC modest ky cave Fu Ae 37 Constant Voltage CV MOGS O las 39 Constant Resistance CR Mode titat oa 40 Constant Power CW Mode i met en MIN DEEREFER EMEN ame 41 Constant Impedance CZ Mode ese rer part pio ae 41 Setting CV CC CR CW CZ Mode sisirin ooi nre sana eode kk tvaha dd de PERRA 43 Local Operation c nire disci A teat 44 Manta 44 Mod UE ec ds 47 Mod le Panel LOCK d 48 Switching A sensed cies dise ec ur vnd sene cmd to eR ro been ke cedsnnsaecaiiscaccdsaseavedsie
12. 57600 115200 Data bit 8 Stop bit 1 Parity None None Even Odd Local address 0 0 through 31 default setting is 0 NOTE When communicating with a PC you can only use one communication interface at a time 74 Specifications Modei mbizoo moi252 moios moisoo misos m 600_ eme oa o3 Pa pa petne y CI CV Mode ES 0 18 V jason E ee i 0 80 V 0 80 V 0 500 V 0 80 V 0 500 V 0 80 V ES ara ara 10 mV 0 05 0 02 FS 0 05 0 025 FS Resolution dia EN CC Mode ee fan osm oim oam ime im nim bod 0 05 0 05 FS 0 05 0 1 FS Accuracy High 0 05 0 05 FS 0 1 0 1 FS CR Mode 0050 100 0 050 109 0250 300 0050 100 0 2 0 10 0 0 2 0 10 0 Range 10 0 7 5 KQ Low 0 01 0 08 FS High 0 01 0 0008 FS Accuracy CW Mode Range 200 W 250 W 300 W 400 W 500 W 600 W Resolution 10 mW Accuracy 0 2 0 2 FS 75 Model MDL200 MDL252 MDL305 MDL400 MDL505 MDL600 ransient Mode CC mode T1 amp T2 20us 3600s Res 5us 10ms Accuracy 5us 100ppm 4 0 0001 0 25 A us 0 0001 0 2 A us 0 0001 0 1 A us 0 0001 0 25 A us 0 0001 0 1 A us 0 0001 0 25 A us Slew Rate 0 001 2 5 A us 0 001 2 A us 0 001 1 A us 0 001 2 5 A us 0 001 1 A us 0 001 2 5 A us Accuracy within 40 of programmed value Measurement Readback voltage 0 025 0 025 FS Readback current O orma Mim tna f tim f im 0 05 0 1 F
13. Self test Run Program 2 Press Shift 4 9 key to enter the Program menu Press V key to Recall Prog select Edit Program and press Enter Edit Program Exit 65 3 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 O 1 07050301 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 1 070YoYo1 5 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 Active SEQ want to cancel a step press the number key again to cancel 098765YYYY Press Enter to confirm your selection 6 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
14. begin sinking current at 5V 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 A Save Group 2 Input the Save Group number 0 100 and press Enter to confirm 62 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 a AL EE LUE EL ns e eltolloltajje TIR bs C Epp gt Tar Jiu Crea EPI LAS Figure 31
15. high low range the front panel will display the following CHO1 Rset 7500 0 Q Ymax 82V Vmin 0V Rset set the impedance value Ri Vmax set the maximum voltage Vmin set the minimum voltage RLC R set the series resistance value Rs RLC R 7500 0 82 RLC L 0uH RLC C 10uF RLC L set the series inductance value Ls RLC C set the parallel capacitance value Ci 42 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 V key to select Range 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 confirm 6 Press V key to select the rise slope setting f Input value and press Enter key to confirm CC mode only 7 Press V key to select the fall slope setting f Input value and press Enter key to confirm C
16. to select FUNCTION MODE ses ke RECALL LIST List and press Enter Press V key to select Edit List and press EDIT LIST Enter EXIT CC LIST Select CC List running mode and press Enter to confirm CV LIST CR LIST Press A v key to select high range or low range and press Enter to High Range confirm Low Range D List file step Input number of steps in List Input value and press Enter to confirm _ s Set first step s current level Input value and press Enter key to confirm Step 001 level 1A 10 Set first step s slew rate Input value and press Enter key to confirm Step 001 rate 0 5A us 11 Set first step s width time Input value and press Enter key to confirm Step 001 width 6S 56 12 Set second step s current level Input value and press Enter key to Step 002 level confirm 2A 13 Set second step s slew rate Input value and press Enter key to Step 002 rate confirm i 0 1A us 14 Set second step s width time Input value and press Enter key to Step 002 width confirm 5S 15 Set parameters for steps 3 through 5 in the same manner described above Repeat Count 16 Set number of run cycles Input value and press Enter to confirm B j s pz s CHO1 17 Select memory position to save list file Input value and press Enter Ame I Save list file to confirm 1 18 Press A key to select lt Function Mode gt and press Enter Select
17. type povver cord 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 First verify that the power cord is firmly plugged into the power receptacle on the rear panel of the electronic load You should also make sure 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 overh
18. 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 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 i i i i i Oo 1 2 3 A4 5 I 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 55 CHO1 CC ON Vdc 0 0000V Press A y keys to select the channel to be edited Adc 0 0000A Wdc 0 00W MANUAL 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 TIMER CHO1 CC OFF 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 Press Shift to enter Configuration menu Press W key
19. 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 conditions Figure 25 shows the current waveform of continuous transient operation mode 50 2 0ms 3 0ms TRIG Figure 25 Continuous Transient Operation Curr
20. 0 or 90 to 10 of the programmed current values The graph below illustrates slew rate measurements Voltage Current or Resistance Change i Measured Time Actual Time Figure 17 Slew Rate Measurement 38 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 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 RANGE you should select HIGH RANGE If the electronic load is in remote co
21. 2 83 84 85 86 87 88 89 90 Ene ohare 1 2 3 4 5 6 7 8 9 10 Sequence Save Group 91 92 93 94 95 96 97 98 99 100 69 Recall Test Files The following is a procedure of how to recall edited test files from the EEPROM Panel Operations VFD Display Run Program Recall Prog 1 Press Shift 9 to enter the Program menu Edit Program Exit 2 Press V key to select Recall Prog and press Enter Input the saved Program Select program number and press Enter to recall the saved testing file NO 1 3 To run the program press A key to select Run Program and press PROG 01 Stop Enter Result 4 Press Start key to start automatic testing If you need to pause press Pause key and then press V key to continue 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 c BBBBc MEL MECA MA v ele RS232 og n I GPIB LAE T7 a AM ANIME 3 e O 8 AA ITI es Ethernet gt Sate pe f mi ms USB x Figure 32 Mainframe Rear Panel Communication Interfaces 70 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 U
22. ABLE Expand SCPI protocol compatible with others ABOUT Mainframe production information MDL Mainframe production model number a Mainframe production serial number HHHHHHHHHHHHHHHHHH VER 1 43 Mainframe software version EXIT 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 I 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 I protection state ALIMIT POINT Set up softvvare current protection value ALIMIT DELAY Set up softvvare current protection delay PLIMIT POINT Set up softvvare povver protection value PLIMIT DELAY Set up softvvare povver 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 S
23. BK la a og i VE rie Wi ViVi MDL Series Programmable DC Electronic Load Models MDL001 MDL002 MDL200 MDL252 MDL305 MDL400 MDL505 MDL600 USER MANUAL E oot Q 2 3 s 6 1 O O Wm G rupem c o 5 A i DANCE 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 connected to an electrical ground saf
24. C mode only 8 Press Esc key to exit 9 Press On Off key to turn on the load s input 43 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 E NIU FN LON YY m OO OO OO OO OO OO i Figure 22 MDL001 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 check all the installed modules of the load and display every channel s number voltage and current measurements 44 2 FUNCTION KEYS Key Description Chan This key is used to switch channels Every modul
25. Fixed lt List gt and press Enter to confirm List 19 Press Esc key twice to exit menus CHO1 CC ON Vdc 0 0000V 20 Press On Off key to turn on the electronic load s input Adc 0 0000A Wdc 0 00W 21 Press Trig key to trigger List mode operation 57 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 MODE CURRent Sets CC List mode 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 58 Triggered Operation Trigger Function Trigger operation can be used in the following operations transient pulse output triggered output and list output The electronic load has five kinds of trigger modes to synchronously trigger the tested instrum
26. OPP OTP and reverse voltage protection Front Panel 1 2 3 4 5 6 7 8 Jg 000001 Figure 1 MDL Series Front Panel VFD DISPLAY Displays electronic load information MODULE PANEL KEYS Controls module 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 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 Am e ase h 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 RR
27. S Readback power are Resolution Accuracy 0 2 0 2 FS Protection Range ove EI ow Ton Tn To Soo a TE 7 Co S o SS Short Circuit 4 4 4 A 3 3 3 A 3 3 3 A 6 6 6 A 3 3 3 A 13 2 12 A Current CC pee C 44 40 A 33 30A 22 20 A 60 6 60 A 33 30A 132 120 A Voltage Voltage CV Resistance CR 220 ma 180 mQ Input Terminal 300 kQ 300 kQ 300 ko 1MQ 300 kQ Impedance 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 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 from 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 Notes 76 Supplementary Characteristics Memory capacity 101 Groups Recommended calibration period Once per year AC power 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 Ope
28. SB488 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 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 V 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 71
29. Sequence number key again to cancel Then press Enter to confirm your 43Y1 selection 7 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 0 channel 3 needs short circuit testing input 3 Then press Enter 1 j 5uY to confirm your selection 8 Set load on time Ton For example if you need 2s input 2 and SEQ01 On Time then press Enter key to confirm 2 0S 9 Set load off time Tor For example if you need 2s input 2 and SEQO1 Off Time then press Enter key to confirm 2 0S 10 Set test delay time Tf For example if you need 1s input 1 SEQO1 P F Delay Time and then press Enter key to confirm 1 05 66 SEQO1 SEQ02 88 3H 4 kh t a 0 Tpf Ton T off Tpf is test delay time 11 Repeat steps 7 through 10 and set the rest of the steps load on off time 12 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 y keys to select condition and press Enter to confirm Stop Condition Complete Failure 13 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 14
30. V 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 buzzer 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 Onc
31. 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 off pin 4 outputs a high TTL level signal Mainframe Extension Connection 000101219 ooo olo piel BEP el un d f E S l ate n us n Mainframe Extension Mainframe Extension us m Interface dn bad ok bie D Mainframe en E x MN PER PR 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 A 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 com
32. 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 Minimum 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 E153 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 mum 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
33. 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 a 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 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
34. csscessseseene 7 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 the MDLOO2 mainframe extension Modules in this series include the MDL200 MDL252 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 232C LAN or GPIB interface The electronic load modules all have similar
35. dule 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 49 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 Trig 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
36. e 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 45 3 ENTRY SHIFT KEYS Description o These are number input keys 69 9 9 9 GJ x C565 63 3 7 m 4 O This key can be used to exit any working state This key is used for decimal O AV These keys are used to move up and down the menu selection Enter This key is used to confirm selection
37. e 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 Software 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 V key to select Alimit State and press Enter Select On and press Enter to confirm On Off Default 5 Press V key to select lt 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 lt 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
38. eat 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 measured 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 um A Eo i S E P Fg wr GHSREHTHB B Mh dll du B eoa a a F 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 WARNING Each terminal can carry up to 30 A current Double terminal connection is needed when the input current is more than 30 A Refer to Figure 11 Connection of Load and Device Und
39. ed 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 SUMMary iia Compliance State ments manaments ms Product OVGIVIEW Re prime
40. elect 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 operation 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 accessories are provided with each mainframe or module Mainframes include e Power cord e User manual e Mainframe extension cable accessory MDLOO2 only
41. 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 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 i 220V De I 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 07050301 Detecting all installed modules dents Displays information of channel 1 or the leftmost channel Vdc 0 0000V Adc 0 0000A Use up and down key to select other channels Wdc 0 00W 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 i VVARNING Your electronic load is equipped vvith a 3 vvire grounding
42. emperature 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 Protection 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 w 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
43. ent 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 short current is 120 of the current range In CV mode short means setting the load
44. ent 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 EN 10ms a TRIG TRIG Figure 26 Pulse Transient Operation 51 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 When setting up steps make sure all transient level slew and width parameters are within the modules specified limits 52 A B Transient Operation Tutor
45. ent 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 60 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 ps 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 Choe lt Von gt and press Enter Meter 61 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 8 Press On Off key to turn on the electronic load s input The electronic load will
46. er 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 and provide better accuracy in your measurement Figure 12 illustrates a typical connection between module and device for remote sense operation LL Sissi bz ase LN mm 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
47. es 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 Immediate Current Value Set the current level via front panel or by sending SCPI command CURR n 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 as the time for the input to change from 10 to 9
48. ety 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 POU VVARNING The WARNING sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly performed or adhered to could result in personal injury Do not proceed beyond a WARNING sign until the indicat
49. for increased power dissipation am janja a ja j L 1 mjs cod LJ 33r aout ae i EET 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 external 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 Co
50. 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 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
51. hout 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 79 BK la oo i VE Pte Wii 22820 Savi Ranch Parkway Yorba Linda CA 92887 www bkprecision com 2013 B amp K Precision Corp Printed in China v030713
52. ial Panel Operations VFD Display 1 Power on the electronic load Self test CHO1 CC OFF 2 Press A v 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 E to change the operating mode to CC mode Press Enter to RANGE HIGH Iset 9 000A CHO1 4 Press V key to select Range setting and press Enter Then press Y 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 f and press Enter For Fall Speed Set 2A us input 2 and press Enter to confirm 2 00A Us I CHO1 7 Press V key to select A level setting lt TRANa gt and press Enter For m 10A input 10 and press Enter to confirm Transition p i Level 10 00A i 3 CH01 8 Press V key to select A width setting lt Ta gt and press Enter For 0 002s input 002 and press Enter to confirm Tran evel p p i 0 0025 CHO1 9 Press V key to select B level setting lt TRANb gt and press Enter For 2A Transition B input 2 and press Enter to confirm iue 200A i CH01 10 Press V key to select B width setting lt Tb gt and press Enter For 0 003s input 003 and press Enter
53. istance level via front panel or by sending SCPI command RES n 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 40 Constant Power CW Mode In this mode the electronic load will consume a constant power When input voltage increases the input current will decrease while power P V 1 will remain the same V Ll Povver setting Input y2 voltage yx Load current Figure 20 Constant Power Mode 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 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
54. lect Plimit Point and press Enter Input OPP power value and press Enter to confirm Power Limit Set 210 00W 5 Press V key to select lt Plimit Delay and press Enter Input delay time before alarm and press Enter to confirm Power 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 t
55. munication 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 V keys Enter System menu by pressing Shift D Use A v keys to navigate through menus 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 rang
56. ng 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 N WARNING Do not place any objects that may block or cover air inlet Module Panel Lock Press Shift O 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 Y 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 48 VFD Indicator Function Description The detailed illustration of the VFD and all indicator functions are as follows A Sensel somal lot LISI VIW I3 rn IA 1 Al iQ sense Figure 24 Load Mo
57. ntrol 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 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
58. ntrol mode you can use the VOLT RANG command to switch voltage range 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 39 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 gt Load Input Voltage V Figure 19 Constant Resistance Mode Ranges When working in CR mode you can press the Setup key to enter the RANGE menu Two 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 Immediate Resistance Level Set the res
59. rating temperature O to 40 C Storage temperature 10 to 60 C Humidity Indoor use lt 95 Dimensions and weight Model Type Dimensions W x Hx D Weight MDLOO1 Mainframe 445 x 183 x 549 mm 15 4 kg MDLOO2 Hob 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 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 x573 mm 5 kg MDL600 Module 82 x 183 x 573 mm 5 kg 77 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 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
60. 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 59 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 input voltage drops below the Von voltage value the electronic load will stop sinking curr
61. 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 protection 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 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 4 Press V key to se
62. 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 Channel 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 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 00 ooono 000000 000000 o o o0 y DO 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 4 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
63. 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 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 41 Figure 21 Constant Impedance Mode 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 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 switched 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
64. 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 78 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 years 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 wit
65. to confirm Trane Wig PERS P l 0 0035 CHO1 11 Press V key to select transient operation mode Tmode and press Continuous Enter Select Continuous and press Enter key to confirm Pulse Toggle 53 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 CONTinous CURRent TRANsient ALEVel 10 CURRent TRANsient AWIDth 0 2ms CURRent TRANsent BLEVel 2 CURRent TRANsient BWIDth 0 3ms TRANsient ON TRIGger IMMediate 54 List Operation List mode 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
66. 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 10V 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 groups of testing files Each file has 10 steps and up to 100 files can be edited and saved into the EEPROM Convenient for production environments automatic test can cascade sequences across multiple channels and allows setting of P F criteria Setting Up Test Files This is a step by step tutorial on how to set up a test file Panel Operations VFD Display 1 Power on the electronic load
67. vdidindentesaadevense 48 Channel Syhchronization cio ii nes iesu AA al Rad dE dE uA 48 VED Indicator Function Description eeeeee ee eene eee eee eene eene nennen nennen nnne nnne nnn n enne n nente nnn 49 Transient Operation iii E EE ee teen oi ies ve eoe ya ea eue es eve pae Pa iio e Enea Eee 50 lehnt E 50 ap 51 o TI ME i adi 52 Setting Up A B Transient Operation c ceeeee cree cree eee eene senes senes tese se sese sese se sese senes sene 52 son l jpEme c penis 55 Setting Up List Operation Modle 4 eon ni etnia nu ir denk kk rano suada ud saxa ena Sn Ax dad oli 55 Triggered Operation me 59 Trigger FUNCION mm cies 59 Trigger SOU Cesc re rc eer oct vae FUE Yye totes a reae eo Ua ea solet 59 Short Pe ratlon me D 59 Input On Off Op ration ioc en ebore nr enhn rk s ne e Rr Ro xi rr ERROR rn ee E RO KR tus cannes 60 Von Operation iss 5 5 sica exe rese Pe ebee crest sorte Eo er ee cosi tac etel aeri tec e Soi 60 E23 AUi 61 Save and Recall Operation iiiteciveesa cunda boe a a E E E COE Ee RERO E CE EE olea 62 Module Controlling Eink canina asa 63 Voltage Failure Indicators 64 Current Monitoring aeren
68. ven seven data bits with even parity Odd seven data bits with odd parity 72 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 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

MDL Series Programmable DC Electronic Load

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