Unit UTL8500 Series User manual

UTL8500 Series
Programmable DC Electronic Load
User Manual

UTL8500 Series User Manual
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Preface
Thank you for purchasing this brand new product. In order to use this product safely and
correctly, please read this manual thoroughly, especially the safety notes.
After reading this manual, it is recommended to keep the manual at an easily accessible
place preferably close to the device, for future reference.
Copyright Information
Uni-Trend Technology (China) Co., Ltd. all rights reserved.
UNI-T is the registered trademark of Uni-Trend Technology (China) Co., Ltd.
UNI-T products are protected by patent rights in China and other countries, including
issued and pending patents. Uni-Trend reserves the rights to any productspecification and
pricing changes.
Uni-Trend reserves all rights. Information in this manual supersedes all previously
published versions. No part of this manual may be copied, extracted or translated by any
means without the prior permission of Uni-Trend.
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 third party within one year
from the date of purchase of the product, the warranty period of one year shall be from the
date of the original purchase from UNI-T or an authorized UNI-T distributor. Power cords,
accessories and fuses, etc. are not included in this warranty.
If the product is proved to be defective within the warranty period, UNI-T reserves the
rights to either repair the defective product without charging of parts and labor, or exchange
the defected product to a working equivalent product (determined by UNI-T). Replacement
parts, modules and products may be brand new, or perform at the same specifications as
brand new products.All original parts, modules, or products which were defective become

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the property of UNI-T.
The “customer” refers to the individual or entity that is declared in the guarantee. In
order to obtain the warranty service, "customer" must inform the defects within the
applicable warranty period to UNI-T, and perform appropriate arrangements for the
warrantyservice. The customer shall be responsible for packing and shipping the defective
products to the designated maintenance center of UNI-T, pay the shipping cost, and
provide a copy of the purchase receipt of the original purchaser. If the product is shipped
domestically to the location of the UNI-T service center, UNI-Tshall 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.
Guarantee Limit
This warranty shall not apply to any defects, malfunction or damages caused by
accidental, machine parts’wear and tear, using outside the product’s specifications,
improper use, and improper or lacking of maintenance. UNI-T under 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) Anymaintenance on altered or integrated products (if such alteration or integration leads
to an increase in time or difficulty of product maintenance).
This warranty is written by UNI-T for this product and it is used to substitute any other
express or implied warranties. UNI-Tand its distributors do not offer any implied warranties
for merchantability or applicability purposes. For violation of this guarantee, UNI-T is
responsible for the repair or replacement of defective products as the only and complete
remedy available to customers. Regardless of whether UNI-T and its distributors are
informed that any indirect, special, incidental, or consequential damage may occur, the
UNI-T and its distributors shall not be responsible for any of these damages.
Safety Information
Warning Caution: to avoid specifies conditions and actions that may pose hazards

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to the user, be sure to use this product in accordance with the regulations.
Please read through the safety guideline, in case the meter is not used properly as
instructions, the protection provided may be weakened or lost.
Correct connection of ground wire: To avoid electric shock, please use the provided
cable to connect and make sure that the product is properly grounded before use.
Please notice the rated operating range. Please ensure that the mains supply does not
exceed 10% of rated operating range to prevent damage.
Use the correct power line: Only use the dedicated UNI-T power line to connect the
measuredpowersupplyandtheelectronicload,whichis toensurethatthereisno overheat
by short-circuit current, otherwise electric shock may occur.
Please notice the product marks before connecting. The instrument supports 2 kinds
of AC input method: 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 perform the
maintenance program. The instrument will not fully discharged after power off, which may
cause electric shock and injury.
Do not operate the product if you suspect it is faulty. Please contact UNI-T authorized
service personnel for inspection. Please disconnect the power supply and stop using.
Never use the instrument beyond the dedicated range of instruction. The provided
protection will be weaken or invalid.It is forbidden to use this product in life-supportsystem
or other devices with safety requirements.
Only trained personnel can perform the maintenance program. Any maintenance,
adjustment, or replacement of parts must be performed by UNI-T authorized maintenance
personnel.

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Safety Symbols
Direct Current
Alternating
Current
Both Direct and
Alternating Current
Three Phase
AC
Earth (Ground)
Terminal
Protective Conductor
Terminal
Signal
Grounding
Caution,
Possibility of
Electric Shock
Warning or Caution
Neutral Wire
or Central
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) Instruction 2002/96/EC
Do not dispose the product and its accessories in trash bin.

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Table of Contents
Preface..................................................................................................................... 2
Copyright Information............................................................................................. 2
Warranty Service..................................................................................................... 2
Guarantee Limit....................................................................................................... 3
Safety Information................................................................................................... 3
Safety Symbols ....................................................................................................... 5
1. Product Description............................................................................................ 8
1.1 Product Series................................................................................................. 8
1.2 Front Panel...................................................................................................... 9
1.3 Rear Panel..................................................................................................... 11
2. Inspection and Installation ................................................................................. 9
2.1 Packing List................................................................................................... 12
2.2 Requirements of Power Supply...................................................................... 12
2.3 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 Constant Resistance Test ....................................................................... 19
4.1.4 Constant Power Test............................................................................... 20
4.2 More Modes................................................................................................... 22
4.2.1 Dynamic Mode ........................................................................................ 23
4.2.2 List Mode................................................................................................. 24
4.2.3 Dual Mode............................................................................................... 28

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4.2.4 OCP/OPP Mode...................................................................................... 29
4.2.5 CR-LED Mode......................................................................................... 30
4.2.6 Battery Mode........................................................................................... 31
4.2.7 Load Effect.............................................................................................. 33
4.2.8 OVP Mode............................................................................................... 34
4.2.9 Short-Circuit Mode .................................................................................. 35
4.2.10 Time Mode............................................................................................ 36
4.3 Parameter Input and Loading Measurement.................................................. 37
4.3.1 Numeric Key............................................................................................ 37
4.3.2 Pulse Knob.............................................................................................. 38
4.3.3 Ripple Measurement............................................................................... 38
4.3.4 Input Control............................................................................................ 38
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 File ................................................................................................................ 47
5.4 Instrument Info............................................................................................... 47
5.5 Local/Remote ................................................................................................ 47
6. Communication Interface and Terminal........................................................... 48
7. Technical Specifications................................................................................... 51

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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, UTL8512B+
and UTL8513.
Models
Measurement Range
Voltage
Current
Power
UTL8511
0~150V
0~30A
0~150W
UTL8512
0~150V
0~30A
0~300W
UTL8512B+
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/0.1mAresolution. 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

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The list mode comes with storage, and supports the saving and applying of the
external U disk and the upgrade of the U disk system.
Screenshot Function with List Storage & Recall
Equipped with Standard RS232 Interface and Support More Extension Interfaces
(USB or RS-485 Converted by RS-232)
Remote Voltage Compensation Input Function
Configured with Upper Computer Software for Remote Control and Monitoring
Ripple Sampling and Detection 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
Description
①
Power Button: Press It to Power ON/OFF
②
USB Interface: The user can save the test data and screenshot to
U-disk. It can also be used in list test files storage/recalling and
system upgrade
③
Numeric Keyboard: It is used to enter numbers and decimal points.

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Delete the Input Values
④
Pulse Knob: It is used to adjust the parameters or move cursor in
the menu.
⑤
Direction Buttons: They are used to move cursor or adjust the
selected value.
⑥
F1-F6 Function Keys: They are used to perform the function
displayed on the screen.
⑦
Input Terminals: They are used to connect power source, please
do not inversely connect to prevent damage
Mode Shortcut Key: Press to enter 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 press for 1-2S to unlock.
Manual Trigger Button: Press Once to Operate a Manual Trigger
Load Input Control: ON/OFF
Esc Button: Exit or Return to Previous Menu
This button is used to confirm/modify the selected item or
parameters.