Hmc-electronics MDL Series BK Precision DC Electronic Load System User Manual

MDL Series Programmable DC Electronic Load Models: MDL001, MDL002, MDL200, MDL252, MDL305, MDL400, MDL505, MDL600 USER MANU

10 Front Panel Figure 1 - MDL Series Front Panel 1) VFD DISPLAY Displays electronic load information. 2) MODULE PANEL KEYS Controls module functi

11 Rear Panel Figure 2 - MDL Series Rear Panel 1) GPIB interface 2) Input terminal of module 3) Remote measurement and external input control t

12 Protection Functions The electronic load has the following protection functions: Overvoltage protection (OVP), overcurrent protection (OCP), overpo

13 Panel Operations VFD Display 1. Power on the electronic load. Self-test 2. Press Shift + ⑧ to enter Configuration menu. Sync On Set Von Meter Pro

14 Overpower Protection (OPP) The electronic load includes both hardware and software OPP features. Hardware OPP – In the event that the electronic l

15 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 outs

16 Menu List The following menus can be viewed on the VFD display. Use  keys to scroll through the menu list and press Enter key to enter the selec

17 System Menu Press Shift + ⑦ key to enter the System menu. MENU INITIALIZE INITIALIZE DEFAULT SET Resume all configuration to default settings PO

18 RS232 SET PARITY SET Set up the communication parity NONE (DEFAULT) ODD EVEN HANDSHAKE SET Select the handshake protocol NONE (DEFAUL

19 Configuration Menu Press Shift + ⑧ key to enter the channel Configuration menu. MENU SYNC ON SET Setup Synchronization ON / OFF function ON (DEFA

2 Safety Summary The following general safety precautions must be observed during all phases of operation of this instrument. Failure to comply with

20 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 Exter

21 Installation Inspection This instrument was carefully inspected before shipment. Upon receipt, inspect the instrument for damage that might have oc

22 Installing Modules CAUTION : Static electricity may damage load modules. Please install modules according to standard electrostatic prevention.

23 Figure 3b - Module Installation 4. Insert and slide the selected modules into the slot. Figure 3c - Module Installation 5. Insert and tighte

24 Figure 3d - Module Installation 6. Install more modules in other slots following the same process (steps 2 through 5). 7. Reconnect the power co

25 The following figures show examples of how channels are assigned when single-channel and dual-channel modules are installed. Figure 5 - Channel Nu

26 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 y

27 Figure 8 - Module Outline Diagram Note : Dimensions are in millimeters (mm). Input Voltage Selection The electronic load can work under 110/2

28 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

29 If the Electronic Load Does Not Turn On Use the following troubleshooting steps to help solve problems you might encounter when turning on the inst

3 DO NOT SERVICE OR ADJUST ALONE Do not try to do some internal service or adjustment unless another person capable of rendering first aid resuscitati

30 Load Connection WARNING : To satisfy safety requirements, load wires between the electronic load and the device under test (DUT) should have a

31 There are two positive terminals and two negative terminals on the rear panel of every module. Single terminal connection is adequate when the inpu

32 There are two input connectors. One is the electronic load’s input measurement terminal and the other is the Vsense measurement terminal. When Vsen

33 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

34 External Trigger Connections There are five kinds of trigger modes: 1) Front panel TRIG trigger mode 2) Rear panel trigger mode 3) BUS trigger m

35 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

36 PC Control Connection The MDL Series DC Electronic Load can achieve remote control via USB, RS-232, LAN, or GPIB interface, but only one interfac

37 Operation Operating Modes The electronic load can work in the following modes: 1) Constant current (CC) operation mode 2) Constant voltage (CV)

38 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

39 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. fro

4 Compliance Statements Disposal of Old Electrical & Electronic Equipment (Applicable in the European Union and other European countries with sep

40 Transient Voltage Level A/B transient voltage level can be set on front panel or by remote operation. The electronic load can continuously toggle b

41 Constant Power (CW) Mode In this mode, the electronic load will consume a constant power. When input voltage increases, the input current will decr

42 VSLs RsRLCL＋－Is Figure 21 - Constant Impedance Mode Ranges When working in CZ mode, you can press the Setup key to enter the RANGE menu. Two overl

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. P

44 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 aut

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 m

46 3. ENTRY/SHIFT KEYS Key Description ⓪ ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ These are number input keys. Esc This key can be used to exit any working state.

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 par

48 Tran Selects the transient mode. Press this key first to enable transient mode before running A/B transient operation and then send the triggering

49 VFD Indicator Function Description The detailed illustration of the VFD and all indicator functions are as follows: Figure 24 - Load Module VFD P

5 Table of Contents Safety Summary ...2 Compliance Statements...

50 Transient Operation Transient operation enables the module to periodically switch between two load levels, as might be required for testing power s

51 Figure 25 - Continuous Transient Operation Current Waveform Pulse In this mode, the electronic load generates a transient pulse of programmable

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

53 A/B Transient Operation Tutorial Panel Operations VFD Display 1. Power on the electronic load. Self-test 2. Press  keys to select the channel

54 12. Press Esc key to exit. CH01 CC OFF Vdc = 0.0000V Adc = 0.0000A Wdc = 0.00W 13. Press Shift + ⑦ to enter System menu. Press  key to select

55 List Operation List mode lets you generate complex sequences of input changes on a single channel with rapid, precise timing, which may be synchron

56 2. Press  keys to select the channel to be edited. CH01 CC ON Vdc=0.0000V Adc=0.0000A Wdc=0.00W 3. Press Shift + ⑦ to enter System menu. Press

57 13. Set second step’s width time. Input value and press Enter key to confirm. Step 002 width = 5S 14. Set parameters for steps 3 thro

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 Program

59 Triggered Operation Trigger Function Trigger operation can be used in the following operations: transient pulse output, triggered output, and list

6 External ON/OFF Control Connection ... 35 Mainframe Extension

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

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

62 4. Select <Von Point> and press Enter. Von Point Von Latch Exit 5. Set the Von Point. Input 5 and press Enter to confirm. Von Point Set =

63 To Recall Panel Operations VFD Display 1. To recall saved data, press the Recall key. It will ask for the Recall Group number. Recall Group

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 Digita

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 th

66 3. Press Setup key to enter the channel setup menu, press Enter key to enter the <Mode> selection menu and press  key to select the operatin

67 13. The MDL Series with mainframe extension can support a maximum of 16 channels. 0 represents the MDL001 mainframe and 1 represents the MDL002 mai

68 0 ≤ Tpf ≤ (Ton+ T off) Tpf is test delay time 21. Repeat steps 17 through 20 and set the rest of the steps’ load on/off time. 22. Set condition f

69 Table 4 - Save Table PROGRAM 1 Sequence 1 2 3 4 5 6 7 8 9 10 Save Group 1 2 3 4 5 6 7 8 9 10 PROGRAM 2 Sequence 1 2 3 4 5 6 7 8 9 10 Save Group 11

7 Setting Up Von Function ... 61 Save and Recall

70 Recall Test Files The following is a procedure of how to recall edited test files from the EEPROM. Panel Operations VFD Display 1. Press Shift +

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 U

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 <RS-232> i

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 fiv

74 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

75 Specifications Model MDL200 MDL252 MDL305 MDL400 MDL505 MDL600 Input Ratings Input Voltage 0-80 V 0-80 V 0-500 V 0-80 V 0-500 V 0-80 V Input Cu

76 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) The slew rate s

77 Supplementary Characteristics Memory capacity 101 Groups Recommended calibration period Once per year AC power input (selectable by switch on th

78 SERVICE INFORMATION Warranty Service: Please go to the support and service section on our website at www.bkprecision.com to obtain an RMA #. Retur

79 LIMITED THREE-YEAR WARRANTY B&K Precision Corp. warrants to the original purchaser that its products and the component parts thereof will be f

8 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,

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9 Features  CC/CV/CR/CW/CZ operating modes  Removable modules for easy system flexibility  Bright VFD display for both mainframe and modules 