UNI-T UTL8500 Series User Manual Download Page 8

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UTL8500 Series User Manual

1. Product Description

Thank you for purchasing the Uni-Trend Programmable DC electronic load. This chapter

mainly covers the following:



Product Series



Front Panel



Rear Panel

1.1 Product Series

UTL8500 series DC electronic load contains 4 models: UTL8511, UTL8512, U

and UTL8513.

Models

Measurement Range

Voltage

Current

Power

UTL8511

0~150V

0~30A

0~150W

UTL8512

0~150V

0~30A

0~300W

0~500V

0~15A

0~300W

UTL8513

0~150V

0~120A

0~600W

UTL8500 series DC electronic load comes with 4.3-inch LCD screen, wide power range

and up to 0.1mV/0.1mA resolution. It supports multiple test modes: dynamic test, overload

test, auto test, list test, battery test and CR-LED test, etc. The instrument is great tools in

areas of electronic performance test, battery set test, power supply test, new energy test,

aerospace industries, high-power test, labs, R&D and production line, etc.

Equipped with standard RS232 interface and support more extension interfaces, UTL8500

series offer multiple-role solutions for your different design and testing requirements.

1.1.1 Features



Measurement Range: 150W/300W/600W,150V/500V,15A/30A/120A



Four Basic Test Modes: CC/CV/CR/CP



Function of Remote Current Monitoring and External Triggering



High Resolution of 0.1mV/0.1mA



Dynamic Voltage/Current Test with up to 10k Dynamic Frequency



Voltage/Current Sampling Rate: 40kHz



CR-LED Test, Power Source Rise/Decline Time Test



Protections of Over-Voltage/ Under-Voltage/ Over-Current/ Over-Power/ Overheat/

Anti- Reverse Connection

Summary of Contents for UTL8500 Series

Page 1: ...UTL8500 Series Programmable DC Electronic Load User Manual ...

Page 2: ...Warranty Service The instrument has a warranty period of one year from the date of purchase If the instrument is damaged due to improper operation by the user during the warranty period the maintenance fee and the costs caused by the maintenance shall be borne by the user and the instrument shall be maintained by the company for life If the original purchaser sells or transfers the product to a th...

Page 3: ...nder the provisions of this warranty has no obligation to provide the following services a Any repair damage caused by the installation repair or maintenance of the product by non UNI T service representatives b Any damage caused by improper use or connection to an incompatible device c Any damage or malfunction caused by the use of a power source not provided by UNI T d Any maintenance on altered...

Page 4: ... 110V and 220V Please check if the switch of load is match with the input power source and the fuse is correctly installed or damage will occur Please do not operate in inflammable and explosive environment Do not use or store the meter in high temperature high humidity flammable explosive and strong magnetic field environments Never open the casing of the product Only trained personnel can perfor...

Page 5: ...l Wire Live Wire On Power Off Power Backup Power Ground Terminal for Chassis Environment Friendly Use Period EFUP This product contains certain hazardous substances and can be used safely during its environmental friendly use period EFUP of 40 years as shown in the symbol on the left If the specified time is exceeded the product should be recovered Waste Electrical and Electronic Equipment WEEE In...

Page 6: ... Operating Environment 13 2 4 Cleaning 13 2 5 Handle of Instrument 13 3 Display Page of Measurement 11 3 1 Power on and Run 14 3 2 Introduction of Screen Display 15 3 2 1 Display of Measurement Interface 15 3 2 2 Introduction of Status Bar 16 3 2 3 Running Indicator 16 4 Measurement Setting 14 4 1 Constant State Test Modes 17 4 1 1 Constant Current Test 17 4 1 2 Constant Voltage Test 18 4 1 3 Cons...

Page 7: ...4 4 Trigger Method 38 4 5 Sense 39 4 6 Screenshot 39 4 7 Saving and Applying of Configuration 39 5 System Configuration Page 40 5 1 System Configuration 40 5 1 1 Language 42 5 1 2 Key Sound 42 5 1 3 Date 42 5 1 4 Warn Sound 42 5 1 5 Time 42 5 1 6 DIM Display 42 5 1 7 Initial Mode 42 5 1 8 Knob Active 43 5 1 9 Communication Setting 43 5 1 10 Restore Factory Setting 43 5 2 Parameter Setting 44 5 3 F...

Page 8: ...st list test battery test and CR LED test etc The instrument is great tools in areas of electronic performance test battery set test power supply test new energy test aerospace industries high power test labs R D and production line etc Equipped with standard RS232 interface and support more extension interfaces UTL8500 series offer multiple role solutions for your different design and testing req...

Page 9: ...tection Function Three Dual Tests CR CC CV CR CV CC OCP OPP OVP Test and Load Effect Test Intelligent Cooling Fan and Power Down Memory Function Independent Short Circuit Test Function Only for CC CV CR CP Mode List Auto Power On Function and Over Voltage Short Circuit Pause Function in List Mode 1 2 Front Panel Figure 1 2 1 Front Panel UTL8512 Table 1 2 1 Introduction of Front Panel No Items Desc...

Page 10: ...ter setting interface to select CC CV CR CP and other modes System Configuration It is used to set the system parameters operating parameters file operations and view the instrument information In order to avoid misoperation the instrument adds keyboard lock function After pressing the lock key other keys are disabled except the ON key When the key light is on the keyboard has been locked long pre...

Page 11: ...itch Voltage Scale Switch of AC Power Source RS232 Interface External Communication Interface to Realize the Remote Control with the Load Current Monitor Terminal BNC Current Monitor Output Terminal Sense Remote Compensation Terminal Remote Voltage Sampling for Electrical Load Specification of Fuse 240V 0 25A 120V 0 5A 2 Inspection and Installation This chapter mainly covers the following Packing ...

Page 12: ...er Cable 1pc Standard Cable 250V 10A for China Spare Fuse 2pcs 240V 0 25A Suitable for 10V Voltage User Manual 1pc Users can download the manuals from UNI T s official website Factory Quality Report 1pc For UTL8512B and UTL8513 Certificate of Conformity and Warranty 1pc 2 2 Requirements of Power Supply UTL8500 series can only be used in following conditions Parameters Requirements Voltage AC 220 1...

Page 13: ... used in common temperature and low condensing zone The general environment requirements are listed as follows During the on load process the speed of the cooling fan will adjust based on the change of the cooling fin s temperature Environment Requirements Operating Temperature 0 C 40 C Operating Humidity 20 80 Non Condensing Storage Temperature 10 C 60 C Altitude 2000m Degree of Pollution II 2 4 ...

Page 14: ...n the rear panel to ON and press the power button on the front panel At this time the power button is green The electronic load screen will display the progress bar of current power on and self inspection instrument information and other parameters 2 After initialization the current measuring status will be displayed on the screen If start up mode has been set the instrument will enter the preset ...

Page 15: ...into the test mode the LCD screen will be divided into several areas to display different information Figure 3 2 Interface of Measurement 3 2 1 Display of Measurement Interface No Items Description of Function 1 Mode Current Measurement Mode or Status 2 Time Current System Time 3 System Icon Display the Status of U Disk Remote Compensation Short Circuit Test and Trigger Function 4 Parameters Real ...

Page 16: ...will Disappear after Triggering Start Up Delay Delay Wait for Start Up Delay the Icon will Disappear when Reaching the Delay Time and then Start up Short Circuit Short In Short Circuit Test Mode Pause Operation Pause In Pause Status 3 2 3 Running Indicator UTL8500 series electronic load comes with running indicator on the ON button In on load mode the indicator will light up indicating that the lo...

Page 17: ... set value CR Mode The electronic load is equivalent to a resistance it changes the input current as the voltage changes CP Mode The electronic load always consumes constant power it reduces the current when the voltage rises to remain constant power More Modes There are many modes under this menu that can be selected by the cursor to meet diverse testing requirements V A W Parameters Current Volt...

Page 18: ...Press the Enter button again to confirm At this time the set current value changes from white to yellow 3 Other parameters can be modified in a similar way 4 Press the ON button the electronic load starts to load and the indicator light below the button lights up If you need to stop the load press the ON button again and the running indicator light goes out Figure 4 1 1 2 Relationship of Voltage a...

Page 19: ...to confirm At this time the set voltage value changes from white to yellow 3 Other parameters can be modified in a similar way 4 Press the ON button the electronic load starts to load and the indicator light below the button lights up If you need to stop the load press the ON button again and the running indicator light goes out Figure 4 1 2 2 Relationship of Voltage and Current in CV Mode 4 1 3 C...

Page 20: ...again to confirm At this time the set resistance value changes from white to yellow 3 Other parameters can be modified in a similar way 4 Press the ON button the electronic load starts to load and the indicator light below the button lights up If you need to stop the load press the ON button again and the running indicator light goes out Figure 4 1 3 2 Relationship of Voltage and Current in CR Mod...

Page 21: ...the value changes from yellow to white by keyboard or pulse knob Press the Enter button again to confirm At this time the set power value changes from white to yellow 3 Other parameters can be modified in a similar way 4 Press the ON button the electronic load starts to load and the indicator light below the button lights up If you need to stop the load press the ON button again and the running in...

Page 22: ...ing the protection function CR LED The test mode is for LED power supply which can simulate the operating parameters voltage current and LED coefficient to measure the performance of LED power supply Battery Discharge the measured battery by CC CR CP mode The test will end automatically when reaching the ending value The battery capacity and the discharge graph will also be display Load Effect Loa...

Page 23: ...then the load will switch to an upper value each time when it receives a trigger signal and it will switch back to the lower value at the end of the set time In pulse mode lower timing is not necessary because the reverse action will be triggered only once when one trigger signal is received Reverse Each trigger will lead to the switching of current on load status and upper lower timing is not nec...

Page 24: ...Other parameters can be modified in a similar way 4 Press the ON button the electronic load starts to load and the indicator light below the button lights up If you need to stop the load press the ON button again and the running indicator light goes out 4 2 2 List Mode The list test function can switch between different modes according to the set parameters For power products and charger devices t...

Page 25: ...stopping method Group The Flash of the electronic load can save 60 groups of list modes When setting the list parameters please set a reasonable group number first 1 Press function key to enter List mode move the cursor to Group by rotating the knob and press the Enter key or the knob to change the group number value from yellow to white Input the appropriate group number value through the numeric...

Page 26: ...ntinues The load will continue to the next step after executing one step until the end of the operation Trig The load will pause after executing a step and wait for the trigger signal before continuing to the next step Err The test will automatically stop when an overrun or other error occurs during the load operation 4 2 2 2 Parameter Setting of Mode After setting Group Step and Mode parameters t...

Page 27: ...e List Mode test page as shown in Figure 4 2 2 2 Figure 4 2 2 2 Test Page of List Mode 7 Press the ON button the electronic load starts to load and the indicator light below the button lights up If you want to suspend the test you can press the Pause button If you need to stop the load press the ON button again and the running indicator light goes out 8 After the test is completed the user can pre...

Page 28: ...f Dual Mode Parameter Setting in Dual Mode Parameter Description Mode CR CC CV CR CV CC Start Value Set the Start Value of the Dual Mode Swap Value Set the Swap Value of the Dual Mode To use the dual mode first select the needed mode and then set the fixed values of the two corresponding modes When the load starts to load first start the load according to the fixed value of the first mode and when...

Page 29: ...d and the indicator light below the button lights up If you need to stop the load press the ON button again and the running indicator light goes out 4 2 4 OCP OPP Mode This mode is used to detect the protection function of the tested power supply under overload conditions UTL8500 series electronic load provides two test modes OCP OPP Figure 4 2 4 1 Interface of OCP OPP Mode Parameter Setting in OC...

Page 30: ...as a test end prompt Operation Steps 1 In initial interface select Mode More and then press OCP OPP to enter the setting interface 2 Move the cursor to the needed setting position by pulse knob and press the Enter button to change the parameter the parameter changes from yellow to white by keyboard or pulse knob Press the Enter button again to confirm At this time the set value changes from white ...

Page 31: ...r button to change the parameter the parameter changes from yellow to white by keyboard or pulse knob Press the Enter button again to confirm At this time the set value changes from white to yellow 3 Other parameters can be modified in a similar way 4 Press the ON button the electronic load starts to load and the indicator light below the button lights up If you need to stop the load press the ON ...

Page 32: ...op voltage of this mode When the battery is discharged to the stop voltage the electronic load automatically stops loading Figure 4 2 6 2 Battery Mode Description of Battery Mode In the actual test process you can check the battery voltage discharge current and discharged capacity at any time After the test you can choose to display the discharge curve for reference Operation Steps 1 In initial in...

Page 33: ...ring the test 4 2 7 Load Effect The load effect mode can carry out loading under 3 different load conditions 10 50 and 100 and continue the load for a preset time 5s and then record the voltage under different loads Finally calculate the load regulation rate Regulation V and other values according to the formula Figure 4 2 7 1 Interface of Load Effect Mode Parameter Setting in Load Effect Mode Par...

Page 34: ...When the voltage drops to the set trigger voltage the load will record the time from the peak point to the trigger point This recorded time is the over voltage protection time of the tested power supply Figure 4 2 8 1 Interface of OVP Mode Parameter Setting in OVP Mode Parameter Description Trigger Voltage Set the Voltage of the Trigger Point If you want to perform OVP test you can press More in t...

Page 35: ... whether the protection function of the measured object can operate normally when the output terminal of is short circuited Figure 4 2 9 1 Interface of Short Circuit Mode Parameter Setting in Short Circuit Mode Parameter Description Current Load Current Value in Normal Status V on Set the Starting Voltage V Limit Constant Value of Overvoltage Protection C Limit Constant Value of Overcurrent Protec...

Page 36: ... Short Cir to enter the short circuit mode When the short circuit mode takes effect the status bar will display the word Short When the short circuit mode ends the word Short disappears 6 Note Step 4 and Step 5 can be interchanged If step 4 is before after pressing the ON button to start first load according to the current setting value and then enter the short circuit mode if step 5 is before pre...

Page 37: ...ore and then press Time to enter the setting interface 2 Move the cursor to the needed setting position by pulse knob and press the Enter button to change the parameter the parameter changes from yellow to white by keyboard or pulse knob Press the Enter button again to confirm At this time the set value changes from white to yellow 3 Other parameters can be modified in a similar way 4 Press the ON...

Page 38: ...lt is affected by the combination and superposition of these two ripples 4 3 4 Input Control After the electronic load is powered on it is in an unloaded state You can control the input switch of the load by pressing the ON button on the front panel If the indicator light of the ON button is on it means that the input is turned on and the real time voltage current and power in the current loop wil...

Page 39: ...e When wiring be sure to connect the object under test and the positive and negative poles of the terminals correctly the Sense switch cannot be switched in the running state 4 6 Screenshot After inserting the U disk in the front panel the electronic load will automatically recognize it and display the USB symbol on the upper right corner of the screen indicating that the U disk has been connected...

Page 40: ...o save files must use the FAT32 file system The allocation unit size cannot be greater than 4096 bytes and the maximum capacity is 32G Please format it in advance when using it otherwise it may cause file storage failure It is recommended to use a branded U disk 5 System Configuration Page This chapter mainly covers the following Packing List Requirements of Power Supply Operating Environment Clea...

Page 41: ...vels of Brightness Adjust the Screen Brightness 5 Levels Initial Mode Default Last Default Boot into the Constant Current CC Interface Last Boot into the Last Test Mode Knob Active On Off If it is On the parameter will change immediately after rotating the knob Address 001 032 Set the Current Communication Address Baud Rate 9600 19200 38400 57600 115200 Set the Baud Rate of RS232 Communication Int...

Page 42: ...to adjust the content to be modified Lastly press to complete the modification 5 1 4 Warn Sound The UTL8500 series electronic load has warn sound function When the load ends or encounters an abnormal problem during the test the electronic load will emit a warn sound through the built in buzzer When the test is successful the load will emit two short beeps When the test fails or encounters other ab...

Page 43: ...to achieve remote control with the electronic load Before connecting to the host computer please make sure to purchase the designated connection lead and select the corresponding communication parameters in the communication setting Communication Setting Setting Content Description Communication Mode RS232 The general model only supports RS232 and supports expansion Baud Rate 9600 19200 38400 5760...

Page 44: ...select Para Set at the bottom of the screen can enter the PARAMETER SETTING page as shown in Figure 5 2 The parameter setting is used to set the operating parameters and protection parameters of the system Figure 5 2 Parameter Setting Page Table 5 2 Description of Parameter Setting UTL8511 Parameter Setting Setting Range Description Run Time 0 99999s Set the Time for Scheduled Uninstall ...

Page 45: ... Set the Role of External Trigger Signal Input Function Multiplexing 5 2 1 Run Time If you set the single load time of the electronic load no matter what mode it is running in the load will automatically stop loading after the set timing is reached When this function is not needed set the parameter to 0 5 2 2 Delay On If you set the delay before the electronic load is loaded each time no matter wh...

Page 46: ...t the external power supply to protect the load itself from damage This function is mainly suitable for LED power supply testing and other fields 5 2 5 Digit Filt Adjusting the parameter of digital filter can improve the stability of the displayed value The electronic load has a total of 4 digital filter parameters that can be selected The larger the filter parameter the better the effect and the ...

Page 47: ... number and serial number of the electronic load 5 5 Local Remote The electronic load has two operating modes local and remote Local use the buttons on the electronic load to operate Remote The electronic load is connected to the PC through RS232 and other communication cables and commands are sent on the PC to perform related operations on the load through the upper computer software When the ele...

Page 48: ...at the end of the electronic load which can be connected to the computer COM port by using a standard RS 232C cable Note In actual use the electronic load only uses three pins 2 3 and 5 to communicate with the device It is recommended to turn off the power of the instrument when plugging or unplugging the connector to avoid electrical shock Table 6 1 Definition of COM Interface RS 232C Pins Pin Nu...

Page 49: ...col own for internal debugging 6 2 Current Monitor I Monitor The current monitor output terminal uses 0 10V analog output signal to represent the zero to full rated input current of the channel to which the terminal belongs An external voltmeter or oscilloscope can be connected to display the change of input current 6 3 Remote Compensation Terminal When the load consumes a large current a voltage ...

Page 50: ...The current monitoring output is a voltage output and the output signal range is 0 10V The real time current from zero to full range is indicated The output signal impedance is less than or equal to 10KΩ Description of Terminals Terminal NO Description Trigger Signal Terminal Diagram 1 Passive Trigger Positive Test Result Power Supply Positive 2 Passive Trigger Negative Active Trigger Positive 3 G...

Page 51: ...gh level of about 500ms When the test result is wrong or fails the terminal outputs a high level of about 1500ms The terminals and are both low level when there is no output 5 The trigger input adopts positive transition edge input Once the passive switch is closed or the trigger voltage signal is loaded it indicates that the trigger signal input has been completed When triggering again the operat...

Page 52: ...alue Delay Protection 1 1 Times the Set Value Immediate Protection FS 15W Immediate Protection 1 05 Times the Set Value Delay Protection 1 1 Times the Set Value Immediate Protection 10us 0 025 0 025 FS 0 025 0 05 FS 300W 0 500V 300W 3V at 15A 0 05 0 025 FS 0 05 0 05 FS 0 1Ω 25KΩ 300W 10mW 0 1 0 1 FS 50μS 99 999S Res 1μS 5μS 100ppm 0 001 1 5A us 10us 0 025 0 025 FS 0 05 0 05 FS 300W 10mW 0 1 0 1 FS...

Page 53: ...3 Remarks Environmental Requirements 23 5 90 RH Recommended Calibration Frequency Once Year AC Power Input Level The switch on the rear panel of the electronic load can choose 110V or 220V 110V 110V 10 50 60Hz 220V 220V 10 50 60Hz ...

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