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Operations

4.2 Local Operations

4.2.1 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). Select a 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.

Figure 4.7

MDL4U001 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.

Содержание MDL4U Series

Страница 1: ......

Страница 2: ...so accompanied by a maximum voltage of the circuit to be tested which defines the voltage impulses expected and required insulation clearances These categories are Category I CAT I Measurement instrum...

Страница 3: ...r flammable atmosphere Do not operate the instrument in the presence of flammable gases or vapors fumes or finely divided particulates The instrument is designed to be used in office type indoor envir...

Страница 4: ...when the covers are removed To avoid injuries always disconnect the power cord from the instrument disconnect all other connections for example test leads computer interface cables etc discharge all c...

Страница 5: ...atibility EMC Directive 2014 30 EU Low Voltage Directive Safety 2014 35 EU Conforms with the following product standards EMC Standard IEC 61326 1 2012 EN 61326 1 2013123 Reference Standards CISPR 11 2...

Страница 6: ...ze your local WEEE collection facilities in the disposition of this product and otherwise observe all applicable requirements Safety Symbols Symbol Description indicates a hazardous situation which if...

Страница 7: ...onic Load Does Not Turn On 24 3 Load Connection 26 3 1 Parallel Connection 27 3 2 Mainframe 8 pin Control Connector 28 3 3 External Trigger Connections 29 3 3 1 Trigger Modes 29 3 4 External ON OFF Co...

Страница 8: ...Operation 52 4 12 Save and Recall Operation 54 4 13 Module Controlling Link 54 4 13 1 Voltage Failure Indication 55 4 13 2 Current Monitoring 55 4 13 3 Digital I O 55 4 13 4 Remote Sense Function 55 4...

Страница 9: ...nels Adding the MDL4U002 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...

Страница 10: ...RS232 interfaces with USBTMC SCPI protocol support Analog current control and monitoring Transient mode up to 25 kHz List mode sequence mode minimum 20 s step width with 84 user programmable steps Adj...

Страница 11: ...s Controls each channel s operating status Refer to Mainframe for more details 5 Mainframe Numeric Keypad Used to enter precise values when adjusting parameters 6 Power Switch Turns the system ON or O...

Страница 12: ...minal use to control an external instrumnet VF Output Voltage fault indication terminal 6 Extended Mainframe Connects MDL4U001 to MDL4U002 to expand channel capacity to 16 channels 7 AC Power Input Fu...

Страница 13: ...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 protecti...

Страница 14: ...time before alarm and press Enter to confirm 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...

Страница 15: ...creen 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 Press the the key to enter the Setup menu Setup MO...

Страница 16: ...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 TI...

Страница 17: ...MDL Mainframe production model number SN Mainframe production serial number VER 1 43 Mainframe software version EXIT Table 1 7 System Menu Cont Configuration Menu Press to enter the Configuration men...

Страница 18: ...igh 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 co...

Страница 19: ...anything is missing 2 2 Cleaning Use a dry cloth or one slightly dampened with water to clean the external case parts Do not attempt to clean internally Warning To prevent electric shock please unplu...

Страница 20: ...n the mainframe off and disconnect the power cord 2 Remove the plastic cover with a flat blade screwdriver Figure 2 1 Removing Covers 3 Loosen the screws on the rear panel and remove the metal place h...

Страница 21: ...modules into the slot Figure 2 3 Module Installation 5 Insert and tighten module screws on rear panel Figure 2 4 Tighten Module Rear Screws 6 Install more modules in other slots following the same pro...

Страница 22: ...occupied Dualchannel modules such as the MDL4U252 and MDL4U302 have two channels If it is a single channel module the channel number is automatically assigned the first number of the slot Figure 2 5 s...

Страница 23: ...are installing equipment on top of your electronic load in the cabinet use a filler panel above the unit to ensure adequate air circulation Caution Do not block the fan exhaust at the rear of the loa...

Страница 24: ...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 electroic load First verify that the power cord...

Страница 25: ...Installation 25 Figure 2 9 Fuse Location Figure 2 10 Fuse Removal...

Страница 26: ...n 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...

Страница 27: ...en 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 o...

Страница 28: ...control connections Figure 3 3 Mainframe Rear Panel 8 pin Control Connnector Pin Signal Description 1 Trigger IN Trigger Signal Input 2 Trigger OUT Trigger Signal Output 3 ON OFF IN Synchronization ON...

Страница 29: ...ing 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 ti...

Страница 30: ...hannel 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 3 5 Mainframe Extension Connection Figure 3...

Страница 31: ...on interface of the electronic load 2 Power on the electronic load 3 Select the channel number via keys 4 Press the to enter the System menu 5 Select Communication and select the desired interface Pre...

Страница 32: ...can be selected LOW RANGE or HIGH RANGE Current can be edited in either of the two ranges Low range will supply higher accuracy and better resolution when you set lower current If any value you set i...

Страница 33: ...ient 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 s...

Страница 34: ...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 out...

Страница 35: ...on 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 RA...

Страница 36: ...GE 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 CP Vmax Vmin Limits These parameters refer to the voltage high a...

Страница 37: ...mode you can use the IMP RANG command to switch impedance range CZ Vmax Vmin Limits These parameters refer to the voltage high and low limit for the automatic test mode During automatic test mode the...

Страница 38: ...e channel setup menu 4 Press the the key to enter the Mode menu 5 Press the the key to select CV CC CR CW or CZ mode Press the the key to confirm 6 Press the the key to select the Range menu Press the...

Страница 39: ...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...

Страница 40: ...sed to trigger the electronic load Select the Manual Trigger mode to use front panel trig gering Start This key is used to start an automatic test Pause This key is used to pause an automatic test The...

Страница 41: ...Operations 41 4 2 2 Module Panel Figure 4 8 Module Front Panel...

Страница 42: ...s the transient mode Press the this key first to enable transient mode before run ning A B transient operation and then send the triggering signal to run a program On Off Control module s input on off...

Страница 43: ...h other channels When in remote control mode the SCPI command INPut ALL ON is used to synchronously load all channels 4 5 Module VFD Indicator Function Description Figure 4 9 indicates Figure 4 9 Load...

Страница 44: ...odically 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 The parameters of the trans...

Страница 45: ...ent operation mode Figure 4 10 Continuous Transient Operation 4 6 2 Pulse The elctronic load generates a transient pulse of programmable width when pulse transient operation is in effect In pulse mode...

Страница 46: ...ys to select the channel to be edited In this example we select channel 1 3 Press the to enter the channel setup menu 4 Select Mode and Press the to change the operating mode to CC mode Press the to c...

Страница 47: ...ce and press the 18 Select Manual and press the key to confirm 19 Press the key to exit 20 Press the key to turn on the electronic load s input 21 Press the key on channel 1 module to enable transient...

Страница 48: ...operation when it receives the trigger signal and will continue until the List operation is completed or the instrument receives another trigger signal Figure 4 13 List Operation 4 7 1 Setting Up List...

Страница 49: ...d step s slew rate Input value and press the key to confirm 17 Set second step s width time Input value and press the key to confirm 18 Set parameters for steps 3 through 5 in the same manner describe...

Страница 50: ...RCL FUNCTION MODE LIST TRIG SOUR BUS TRG Function 40 Sets List range 10000 Sets List cycle Sets List steps Sets List step 1 level Sets List step 1 slew rate Sets List step 1 width Sets List step 2 le...

Страница 51: ...mainframe will enable a trigger operation periodically 4 9 Short Operation The electronic load can simulate a short circuit at its input During front panel operation press the key to switch the short...

Страница 52: ...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 s...

Страница 53: ...Point and press the key 6 Set the Von Point Input 5 and press the to confirm 7 Press the key to select Von Latch and press the key 8 Select On and press the key to confirm 9 Press the key twice to exi...

Страница 54: ...atile memory and will remain saved even in a powered down state To save the channel s settings 1 After setting up your parameters press the key to save It will ask for the Save Group number 2 Input th...

Страница 55: ...te 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 ele...

Страница 56: ...h of these sequences is correlated to instrument settings that are stored within a designated group of internal EEPROM memory They are designated according to the table below Save Table PROGRAM 1 Sequ...

Страница 57: ...testing voltage In this example the first step is 0 15V Press the and then to confirm 10 After editing the first step of channel 3 press the key to exit the menu 11 Press the keys to select channel 5...

Страница 58: ...ess the the number key of the step For example to suspend step 2 press the 2 Press the the number key again to cancel Then press the to confirm your selection 21 To edit the first step of the 4 steps...

Страница 59: ...nput and then press the key to confirm 28 Save the edited files into the EEPROM Up to 10 program files can be saved For instance press the 1 to save the edited file to program file 1 and then press th...

Страница 60: ...Operations 60 4 16 Remote Operation There are four types of communication interfaces available USB Ethernet GPIB and RS232 Figure 4 18 Communication Interfaces...

Страница 61: ...ic load Press on the front panel to enter the System menu Select Communication and choose ETHERNET Then select Ethernet Set to set gateway address Gateway Set IP address IP Set mask address Mask set a...

Страница 62: ...ne eight data bits without parity Even seven data bits with even parity Odd seven data bits with odd parity RS232 Flow Control The RS232 interface supports the following flow control options For each...

Страница 63: ...ck the following 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 st...

Страница 64: ...Specifications...

Страница 65: ...Specifications 65...

Страница 66: ...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 charg...

Страница 67: ...w instrument via our website www bk precision 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 warra...

Страница 68: ...Error Messages 90 22820 Savi Ranch Parkway Yorba Linda CA 92887 www bkprecision com 2021 B K Precision Corp Version August 5 2021...

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