UNI-T UTL8500+ Series User Manual
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UNI-T UTL8500+ Series User Manual

UNI-T UTL8500+ Series User Manual

Dc electronic load
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User's Manual
UTL8500+/UTL8500X+ Series DC Electronic Load
V1.0
2024-05-10

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Summary of Contents for UNI-T UTL8500+ Series

  • Page 1 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load V1.0 2024-05-10...

  • Page 2: Warranty Service

    If the product is shipped domestically to the location of the UNI- T service center, UNI-T shall pay the return shipping fee. If the product is sent to any other location, the customer shall be responsible for all shipping, duties, taxes, and any other expenses.
  • Page 3 This warranty is written by UNI-T for this product, and it is used to substitute any other express or implied warranties. UNI-T and its distributors do not offer any implied warranties for merchant ability or applicability purposes.

  • Page 4: Safety Requirements

    Users must follow the following conventional safety precautions in operation, service and maintenance of this device. UNI-T will not be liable for any personal safety and property loss caused by the user’s failure to follow the following safety precautions. This device is designed for professional users and responsible organizations for measurement purposes.
  • Page 5 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Safety Sign It indicates possible danger of electric shock, which may cause Danger personal injury or death. It indicates that you should be careful to avoid personal injury or Warning product damage. It indicates possible danger, which may cause damage to this device or other equipment if you fail to follow a certain procedure Caution or condition.
  • Page 6 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Three-phase public power unit and outdoor power supply line equipment. Equipment CAT IV designed to “initial connection”, such as power distribution system of power station, power instrument, front-end overload protection, and any outdoor transmission line. Certificatio CE indicates a registered trade mark of EU.
  • Page 7 If this device may be faulty, please contact the authorized maintenance personnel of Abnormality UNI-T for testing. Any maintenance, adjustment or parts replacement must be done by the relevant personnel of UNI-T. Do not block the ventilation holes at the side and back of this device.

  • Page 8: Product Introduction

    Automatic application: power, charger, driver, batter Serial connection application: overcurrent test, programmable constant current, 5 1/2 digit ampere meter, current waveform detection Other applications: LED simulation, battery simulation, intelligent and programmable automated test 3.2 Accuracy of Instrument UTL8500+ Series Series UTL8511+ UTL8512+ Model...
  • Page 9 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 0.01mA 0.1mA 0.01mA 0.1mA Current) mode Resolution ±（0.03+0.05%FS) ±（0.03%+0.05%FS) Accuracy 0.05Ω~10kΩ 0.05Ω~10kΩ Range CR (Constant 16bit 16bit Resolution Resistance) (0.1+0.01R)% (0.1+0.01R)% mode Accuracy 150W 300W Range CP (Constant 10mW 10mW Resolution Power) mode ±（0.1%+0.1%FS) ±（0.1%+0.1%FS) Accuracy...
  • Page 10 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 15 test modes: CC, CV, CR, CP, 15 test modes: CC, CV, CR, CP, dynamic, OVP, time, OCP, CR-LED, dynamic, OVP, time, OCP, CR-LED, Test mode battery, automatic list, short circuit, battery, automatic list, short circuit, load effect, combination, list load effect, combination, list 300KΩ...
  • Page 11 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Range 0.05Ω~10kΩ 0.05Ω~10kΩ 0.05Ω~10kΩ 0.05Ω~10kΩ (Constant Resolution 16bit 16bit 16bit 16bit Resistanc Accuracy (0.1+0.01R)% (0.1+0.01R)% (0.1+0.01R)% (0.1+0.01R)% e) mode Range 200W 200W 400W 400W (Constant Resolution 10mW 10mW 10mW 10mW Power) ± （0.1%+0.1%FS) ±...
  • Page 12 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 165V 550V 165V 550V Over-temperature ≥85℃ ≥85℃ ≥85℃ ≥85℃ protection Short Current(CC) ≤3A ≤30A ≤1.5A ≤15A ≤3A ≤30A ≤3A ≤30A Circuit Voltage(CV) Resistance 60mΩ 60mΩ 200mΩ 200mΩ 50mΩ 50mΩ 120mΩ 120mΩ (CR) Ripple display √...
  • Page 13 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 0~12A 0~120A 0~6A 0~60A 0~40℃ Input current 600W 600W Input power Minimum of operating 1.4V±0.1V at 120A 2.8V±0.2V at 60A voltage 0.1~15V 0.1~150V 0.1~50V 0.1~500V Range 10mV 10mV (Constant Resolution Voltage) ±（0.03%+0.05%FS) ±（0.03%+0.05%FS) Accuracy mode 0~12A...

  • Page 14: Main Features

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Delay protection when ≥ 152 Delay protection when ≥ V, Immediately protection 505V,Immediately protection when Overvoltage protection when ≥ 165 V ≥550V ≥85℃ ≥85℃ Over-temperature protection ≤12A ≤120A ≤6A ≤60A Current (CC) Short Voltage (CV) Circuit 35mΩ...

  • Page 15: Product Overview

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Supports OCP test and maximum power test  Supports time measurement (TIME)  Supports OVP test  Supports intelligent and programmable automated list test (LIST)  4. Product Overview 4.1 Front Panel Figure 4-1 Front Panel Name Description USB HOST...

  • Page 16: Rear Panel

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Mode: select a test mode Lock: lock key (long press to unlock/short press to lock) Menu: enter the system setting Trig: trigger control /short-circuit test (SHORT) On/Off: control the input state of load ON/OFF Display setting and measurement interface Screen Brand and model...

  • Page 17: Packing List

    1．Check whether the appearance is damaged, scratched or has other defects; 2．Check with packing list to confirm that accessories has no loss. If the instrument is broken or the accessory is missing, please contact with UNI-T sale department or the distributor.

  • Page 18: Operating Environment

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Please remove the external power cord before replace the fuse, open the fuse socket slot under the power  supply interface, take out the old fuse and replace the new fuse, after that the instrument can be used normally.

  • Page 19: Routine Inspection

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 5.5 Handle Handle is adjustable and can adjust to four positions, hold two sides of the handle to pull or rotate as shown in the following figure. Figure 5-1 Original Position Figure 5-2 Test Position Figure 5-3 Remove Handle Figure 5-4 Lift Position 5.6 Routine Inspection...

  • Page 20: Measurement Display Page

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 6. Measurement Display Page 6.1 Power Up The correct self-inspection of electronic load is as follows. Connect the power cord correctly and make sure that the 110 V/220 V power switch is selected correctly. Press the power switch on the front panel to power up the electronic load.

  • Page 21: Screen Display

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 6.3 Screen Display LCD will divided into several areas to display information when enter the measurement mode. Take CC mode of UTL8511+ as an example, as shown in the following figure. 6.3.1 Measurement Interface Name Description State...

  • Page 22: Short Circuit

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load When it is illuminated, which means the Remote sense Sense remote sense is enabled. It indicates that USB is inserted 0000.00.00 Displays the current system time: System time 00:00 year/month/day/time/minute Alarm It indicates that the alarm sound is enabled. The electronic load is under the short-circuit Short-circuit Short...

  • Page 23: Measurement Setup Page

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 7. Measurement Setup Page Mode and Measurement The electronic load has four constant test mode, which are CC (constant current), CV (constant voltage), CR (constant resistance) and CP (constant power). In addition, it has 11 kinds of other modes, which are dynamic, OVP, time, OCP, CR-LED, battery, automatic list, short-circuit, load effect, combination and list.
  • Page 24 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Figure 7-1-1 CC Mode Operation Steps Select the [Mode] key on the initial interface, and press the [CC] key to enter the <Constant Current> page. Use the rotary knob to move the cursor to the current field, and press the [Enter] key to change the current field from black to brown, at this point, the current value can be set.
  • Page 25 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 7.1.2 CV (Constant Voltage) Test In the CV mode, the electronic load maintains the input voltage as the set value by changing the current consumption. Figure 7-1-3 CV Mode Operation Steps Select the [Mode] key on the initial interface, and press the [CV] key to enter the <Constant Voltage> page.
  • Page 26 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 7.1.3 CR (Constant Resistance) Test In the CR mode, the electronic load is equal to a resistance, the input voltage will change with the voltage to maintain a constant resistance. Figure 7-1-5 CR Mode Operation Steps Select the [Mode] key on the initial interface, and press the [CR] key to enter the <Constant Resistance>...
  • Page 27 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 7.1.4 CP (Constant Power) Test In the CP mode, the electronic load consumes the rated power, the instrument will change the current according to the voltage, to maintain the set power. Figure 7-1-7 CP Mode Operation Steps Select the [Mode] key on the initial interface, and press the [CP] key to enter the <Constant Power (CP)>...

  • Page 28: Other Mode

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Other Mode To meet a variety of test needs, UTL8500+ and UTL8500X+ series electronic load provides multiple test modes, which are dynamic test, list test, time test, OCP test, CR-LED test, battery test, OVP test, short circuit test, load effect test and combination test, as shown in Table 4-2.
  • Page 29 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load During the test, the electronic load constantly increases the set load value to detect the protective value of the DUT. The electronic load can simulates a short-circuited circuit at the input terminal, Short test it is used to detect whether the protection function of DUT is working when the output terminal of the DUT is short-circuited.
  • Page 30 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Ta---Time of low range Set the load time for low range Ib---High value Set the high value Tb---Time of high range Set the load time for high range R-Slope(Rising slope) Set the rising slope F-Slope(Falling slope) Set the falling slope Operation Mode...
  • Page 31 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 3. Toggle mode: the electronic load will toggle once between the high and low values for each trigger. At this time, there is no need to set the time for both high and low. And it will only toggle to the other state after each trigger is performed.
  • Page 32 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 7.2.2 OVP Test The OVP test can capture the peak of input voltage and the entire drop process after the protection is enabled. When the voltage drops to the set trigger voltage, the electronic load will record the time from the highest point to the trigger point, the time is the overvoltage protection time of the measured voltage.
  • Page 33 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load rotary knob to enter the set value and then press the [Enter] key to confirm. The field area will change from brown to black. The operation step of other parameters are the same as above. The electronic load starts to work when the ON/OFF key is pressed, and the indicator will be illuminated.
  • Page 34 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Before the time test, the load mode, load value, start/stop condition, trigger mode and start/stop value of the electronic load should be preset. During the time test, the electronic load will be loaded according to the preset setting, the electronic load starts time record;...
  • Page 35 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Parameter setting of Parameter Description I Start (Start current) Set the start value for this test mode I End (Cut-off current) Set the maximum cut-off value for this test mode Steps Set the number of test for this test mode Dwell (Step time) Set the time interval for each step V Trig (Trigger voltage)
  • Page 36 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load to enter the set value and then press the [Enter] key to confirm. The field area will change from brown to black. The operation step of other parameters are the same as above. The electronic load starts to work when the ON/OFF key is pressed, and the indicator will be illuminated.

  • Page 37: Battery Test

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Operation Steps Select the [Mode] key on the initial interface, and press the [MORE] key to select the [CR-LED] key to enter the <CR-LED> page. Use the rotary knob to move the cursor to the field to be set, and press the [Enter] key to change the field area from black to brown, at this point, the field area can be set.
  • Page 38 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Parameter Setting of Battery Test Parameter Description Mode Discharge mode: CC/CR/CP Value (Load value) Set the load value Stop (Stop condition) Set the stop condition for this test Voltage (Cut-off voltage) Set the lower limit of voltage (cut-off voltage) for stop discharge Capacity (Cut-off capacity) Set the accumulated capacity for stop discharge Time (Cut-off time)
  • Page 39 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Figure 7-2-12 Charge and Discharge Curve Note: The battery test curve can only be displayed after the test is finished! Operation Steps Select the [Mode] key on the initial interface, and press the [MORE] key to select the [BATTERY] key to enter the <Battery Mode (BAT)>...
  • Page 40 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Figure 7-2-13 Automatic List Test Setting Interface Parameter setting of automatic list test List Mode Parameter Description List name Set the English name of this list test file 24 characters for later use Mode Continuous/Pulse /CONT+EX) Set the switch mode and stop mode for...
  • Page 41 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load The step setting is to quickly preset the test step. Press the list key to enter the list parameter page, use the rotary knob to edit the list parameter. Press the [Enter] key and then press the numerical keyboard to enter the set parameter, after the edit is completed, press the softkey “More>>”...
  • Page 42 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load When using the check function of the automatic list mode, the range of the check item cannot be checked in single constant mode. For example, in CC mode, only the voltage and power value can be checked, the upper and lower limit of the current cannot be checked.

  • Page 43: Short Circuit Test

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 7.2.8 Short Circuit Test The electronic load can simulate a short-circuited circuit in the input terminal, it is used to detect whether the protection function of the DUT is working when the output terminal of the DUT is short-circuited. Figure 7-2-15 Short Circuit Test Interface Parameter Setting of Short Circuit Parameter...
  • Page 44 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load When the nominal power of the power supply is greater than the maximum power 1.5 times of the electronic load, the function should be tested with an appropriate voltage setting before use. < Appropriate voltage maximum nominal power of the electronic load maximum nominal current of power...
  • Page 45 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Figure 7-2-16 Load Effect Test Interface Parameter Setting of Load Effect Parameter Description I Min Set load current that stimulates low current working load I Max Set load current that stimulates high current working load I Normal Set load current stimulates normal current working load Set the transfer residence time e of the load under each simulated...
  • Page 46 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Use the rotary knob to move the cursor to the field to be set, and press the [Enter] key to change the field area from black to brown, at this point, the field area can be set. Use the keyboard or press the rotary knob to enter the set value and then press the [Enter] key to confirm.
  • Page 47 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Before using the combination test, select the combination mode and set the constant value for the two mode. When the electronic load starts to load, it will be loaded with the constant value of the first mode, and when the external input changes the parameter to the set switching value, the electronic load switches to the second load mode.
  • Page 48 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load The electronic load supports up to 21 files. Each file supports up to 200 steps. The current change rate can be set for each step. Figure 7-2-19 List Test Interface Parameter setting of list test List Mode Parameter Description...
  • Page 49 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load numerical keyboard to enter the set parameter, after the edit is completed, press the softkey “More>>” and save key to save the LIST file. Operation Mode Operation mode: continuous/count/step Continuous: the electronic load is continuously loaded in sequence. Count (Step by step): Each time a trigger signal is received, the electronic load will load in sequence and repeat the period of 1~10000000.
  • Page 50 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Use the rotary knob to move the cursor to the field to be set, and press the [Enter] key to change the field area from black to brown, at this point, the field area can be set. Use the keyboard or press the rotary knob to enter the set value and then press the [Enter] key to confirm.

  • Page 51: Input Control

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 7.3.2 Rotary Knob Input Before entering the parameter, the cursor has a default value, it can be adjusted by using the rotary knob and moving the arrow key to move the cursor until the number is set, and then press the [Enter] key to complete the setting.

  • Page 52: Trigger Mode

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 7.4 Trigger Mode When using the dynamic mode, list test and time test, it may use the external trigger function, the user can enable the external trigger input function by turning on the external trigger switch. The trigger level can select high level trigger or low level trigger.
  • Page 53 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load On each test page, press the function key [SENSE] at the bottom of the screen, an icon of [Sense] will appear on the top of the screen, indicating that the remote compensation function is enabled. At this point, the voltage detected by the sense terminal as the actual voltage.
  • Page 54 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Note: USB format must be FAT32 and the allocation size cannot greater than 4096 bytes. The maximum capacity is 32G. Before using USB, please formatting USB in advance, otherwise it may fail to save the file. It is recommended to use a branded USB.

  • Page 55: System Setting

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 8. System Setting In non-operation state, press the [Menu] key on the front panel to enter the system configuration page. The system configuration page is divide into <System Configuration>, <Parameter Setting>, <Dynamic Setting>, <CV Setting>...
  • Page 56 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Measure Rate High/fast/medium/slow The test speed has four ranges RS232/RS485 Set the communication port Com Bus (RS485 can connect converter) SCPI/MODBUS Select the communication protocol Com Mode (MODBUS keeps extension) Brightness 5/20/40/50/60/80/100% Set the brightness of the screen 1~255 Address Multi-machine communication for 485 bus...
  • Page 57 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load V ON (Load voltage) 0~150 V Set the load voltage for the start of each run V OFF (un-load voltage) 0~150 V Set the low voltage for automatic end of load I-rise 0.0006~3 A/uS Set the current rising slope under loading I-fall 0.0006~3 A/uS...
  • Page 58 User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load R-slope 0.0006~3A/uS Set the current rising rate for the dynamic test F-slope 0.0006~3A/uS Set the current falling rate for the dynamic test Mode Continuous/pulse/toggle Set the operation mode for the dynamic test External trig OFF/ON Set the input switch for the external trigger signal Trig level...

  • Page 59: Device Information

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 8.5 Device Information This page displays the device information of model, serial number, software version and hardware version. 9. Communication 9.1 RS232 UTL8500+ and UTL8500X+ series is equipped with RS232, so the user can choose the communication wire for remote control.

  • Page 60: Communication Setting

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load Data Set Ready Request to Send Clear to Sent Ring Indicator 9.2 Communication Setting Communication setting is used to set the communication parameter between the electronic load and the upper computer. The electronic load communicates with the upper computer through RS232, and users can purchase the required connection cable to realize the remote control with the electronic load.

  • Page 61: Handler Interface

    User’s Manual UTL8500+/UTL8500X+ Series DC Electronic Load 9.4 Handler Interface Connection terminal Terminal Description Keep/remote control pull load External trigger signal output Device failure output Forbid remote input signal Trigger signal input (TRIG) Ground (GND) A trigger is activated when the TRIG port is pulled low. 9.5 Factory Setting After the reset is completed, the instrument setting will restore to the preset parameter.

  • Page 62: Appendix A Maintenance And Cleaning

    If the product is proven to be defective within this period, UNI-T will repair or replace the product in accordance with the detailed provisions of the warranty.

  • Page 63: Appendix C Contact Us

    In any case, UNI-T does not bear any responsibility for indirect, special, or consequential loss. 10.3 Appendix C Contact Us If the use of this product has caused any inconvenience, if you in mainland China you can contact UNI-T company directly.

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