UNI-T UT3550 Battery Tester User Manual

** UT3550 Battery Tester
User Manual**

Preface
Thank you for purchasing this product. In order to use this product safely and correctly, please read this manual thoroughly, especially the safety notes.
Copyright Information
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 product specification and pricing changes.
Uni-Trend Technology (China) Co., Ltd. all rights reserved. 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.
UNI-T is the registered trademark of Uni-Trend Technology (China) Co., Ltd.
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 UNl-T distributor. Power cords, accessories, fuses, etc. are not included in this warranty.
If the product is proved to be defective within the warranty period, UNI-T reserves the right to either repair the defective product without charge for parts and labor or exchange the defective product for 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 that were defective become 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, the “customer” must inform the defects within the applicable warranty period to UNI-T, and perform appropriate arrangements for the warranty service.
The customer shall be responsible for packing and shipping the defective products to the individual or entity that is declared in the guarantee. In order to obtain the warranty service, the customer must inform the defects within the applicable warranty period to UNI-T, and perform appropriate arrangements for the warranty service. 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 purchase receipt of the original purchaser. If the product is shipped 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.

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 maintenance. UNIT 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) Any maintenance 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-T and 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, UNI-T and its distributors shall not be responsible for any of these damages.

Safety Instructions

Warning Danger：
To avoid possible electric shock and personal safety problems, please follow the instructions below.

Disclaimer| Please read the following safety information carefully before starting to use the instrument. Uni-Trend will not be responsible for the personal safety and property damage caused by the user’s failure to comply with the following terms.
---|---
Instrument Grounding| To prevent the risk of electric shock, please connect the power ground wire.
DO NOT use the instrument in an explosive atmosphere| Do not use the instrument in flammable and explosive gas, steam or dusty environment.
The use of any electronic equipment in such an environment is a risk to personal safety.
DO NOT the outer shell of the instrument| Non-professional maintenance personnel should not open the outer shell of the instrument to try to repair the instrument. The undischarged charge still exists for a period of time after the instrument is turned off, which may cause electric shock.
DO NOT use instruments that work
abnormally| If the instrument does not work properly and its danger is unpredictable, please disconnect the power cord, do not use it, and do not try to repair it yourself.
DO NOT use the instrument beyond
the way specified in this user manual| If it exceeds the range, the protective measures provided by the instrument will become invalid.
| Warning：
For the instrument model UT3550, do not apply AC voltage and DC voltage exceeding100V to the test terminal, otherwise, the instrument will be damaged.
Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC
| Must not be discarded in the trash can.

Introduction

This chapter includes:
Product Introduction
Main function
Front panel & Interface panel
1.1 Product Introduction
UT3550 battery internal tester, measured voltage range is 100V. See the below table, a more specific technical index refers to the last chapter.

Voltage: 0.0001~100.00V

Product Characteristics UT3550 is an automated and real-time detection handheld instrument made by a high-performance 32-bit ARM microprocessor. This instrument can test resistance 0.001mΩ~30.00Ω and DC voltage 0.0001V~100.00V.
It has a built-in USB-Type-C interface, through data collection software to remote control, collect and analyze data.
UT3550 uses a remote control instruction set and is compatible with SCPI (Standard Command for Programmable Instrument) to fulfill remote control and data collection.
The AC resistance testing principle can be used for the internal resistance testing of almost all batteries, including lithium batteries, Hydrogen fuel batteries, lead-acid batteries, button batteries, and other batteries. The design allows direct online measurement of the UPS without loss of accuracy and stability. IP65 is dustproof and waterproof, even in the dust pollution, splashing industrial site, can also help you to accurately measure.
1.2 Main Function
1.2.1 Calibration Function
Full-range short circuit zeroed function.
1.2.2 Comparator Function（sorting）
Built-in sorting data, estimate measured object by OK/NG.

• Compare Method:
  ABS tolerance ± TOL sorting: compared with the upper/lower value of measured value and absolute deviation value
  PER tolerance TOL sorting: compared with the upper/lower value of measured value and percentage deviation of nominal value
  SEQ comparison sorting: measured value compared with the upper/lower value

• Beep
  The beep can be set OFF / OK / NG beep by user-defined.

1.3 System

1. Keypad lock function
2. Switch Chinese/English language
3. Date and time setup
4. Administrator and user account, administrator account can set code
5. Backlight setup
6. Auto power off time setup

1.3.1 Remote Control
Support maximum 115200bps baud rate, compatible with SCPI protocol, ASCII transmission.
1.4 Front Panel
1.4.1 Introduction of Front Panel

| 1| 3.5 inches LCD
2| Function keys
3| Power switch
4| Test terminals
5| Function short cuts
6| Numeric keypad

Introduction of Symbol

connect
| It presents measured value is qualified within comparator range
| It presents measured value is not qualified with comparator range
| After setting up the comparator, the measured result is failed (unqualified)
| After setting up the comparator, the measured result is passed (qualified)

1.5 Interface Panel

| 1| Type-C interface
2| USB interface
3| Power Socket
4| 0.96 inches sub-display
5| Replaceable clip

Inspection and Installation

2.1 Packing List
Before use:

1. Check whether product appearance is damaged, scratched, or has other defects;
2. Check with the packing list to confirm that the accessories have no loss.
   If there have any problems, please contact with Uni-Trend Instrument Sale Department or the distributor.

tester
User Manual| 1| electronic file, download from the official website

2.2 Requirements of Power Supply
It has a standard power adapter for the UT3550 battery internal resistance tester.
When connecting with an external power supply, the instrument will use an external power supply, and the cell stop supplying power automatically. The external power supply also can charge up a built-in lithium battery. It is suggested that use our company’s specialized power adapter.
Insert the power adapter into the AC input terminal on the instrument.
AC Power Adapter:
Input: 100V-240V, ~50Hz/60Hz, 0.6A Max
Output: 9V,2000mA
Warning: It can not use another standard power adapter. This instrument can only match our company’s power adapter and recharge lithium battery!
If the battery capacity is not full, then inserting the power adapter into the instrument enables to charge up the built-in lithium battery. When the backlight of the power switch light on yellow, it presents in-charing. The indicator light still lights on after powering off, it will light on the green when fully charged.
2.3 Operating Environment
UT3550 series must be used under the following environmental conditions:
Temperature: 0℃～40℃
Humidity: 10~80%RH
Altitude: 0~2000 meter
2.4 Cleaning
To prevent the risk of electric shock, please pull out the power line before cleaning.
Please use a clean cloth dipped in clean water to clean the cover and panel.
Do not clean the inside of the instrument.
Notes: Do not use solvents (alcohol or gasoline etc.) to clean the instrument.
2.5 Replace Battery
The instrument has a built-in rechargeable lithium battery, and the battery is installed in the cell barn.
If it needs to replace the battery, please do it as the figure:

1. Take down screws
2. Open cell cover
3. Pull out the built-in lithium battery

2.6 Replace Strap
The strap can replace or take down, please the following steps,

1. Take down screw
2. Push the strap
3. Push down and then pull out the strap

2.7 Tilt Stand

Preparation before Measurement

3.1 Power on and Run
3.1.1 Power on and off
Turn on the power switch , when the indicator light display green（no power supply）， it presents the power has been turned on.
3.1.2 Introduction of Test Lead
UT3550 series battery internal resistance tester is equipped with UT-L84 Kalvin clips and UTL86 test pen-crown probe, which is convenient for users to measure more professionally.

3.1.3 Test Lead
From the perspective of safety and test accuracy, it is recommended to use the standard test lead for measurement. The contact surface of the test lead is gold plating, in the long-term work (1~2 years), it may cause plating abrasion, it is suggested that the user replace the new test lead if the test result appears deviation.
3.1.4 Connection of Test Lead
Before measurement, follow the steps below to connect the test leads to the test terminals of the instrument：

1. Before connecting the test line, please make sure that the power switch is OFF;
2. Make sure there is no connection at the top of the test leads of the four terminals;
3. Connect the test leads of the four terminals to the input terminals of the instrument according to the method shown in Figure 3-1-4, the steps are as follows,

Connect the black test lead to the black terminal hole of the instrument and the red one to the red terminal hole.
The▲symbol of the black test lead must match the black SENSE hole on the front panel, and the▲ symbol of the red test lead must match the red SENSE hole.
The test lead must connect with the terminal correctly, otherwise, it may affect the output of the test result.

Figure 3-1-4
Schematic Diagram of the Connection between the Test Lead and the Terminal Hole of the Instrument

Note: In order to ensure the accuracy of the instrument, please use the attached test lead for testing.
Warning: It is prohibited to connect the AC current and voltage source directly to the test terminals.
3.2 Measurement Method of DUT
After correctly connecting the test leads to the Sense and Source test terminals of the instrument, please connect the test leads to the DUT as follows. Note that the red test pen should be connected to the positive electrode of the battery, and the black test pen should be connected to the negative electrode. As shown in Figure 3-2-a.
If the positive and negative poles of the terminal of the DUT are connected reversely, and the test voltage value is negative, please exchange the positions of the red and black test pen.

• When testing with an alligator clip, the user can use the test lead to directly champ the terminal of the DUT for four-terminal testing.
• If testing with a crown probe test pen, the user can put the red and black test lead probes against the corresponding positive and negative terminals of the DUT for four-terminal testing, as shown in Figure 3-2-b.

Note: When a negative voltage appears, it is caused by the reverse connection of the test leads, and the positions of the red and black test pens need to be changed.
3.3 Set Zero and Calibration
Before testing, please perform the short circuit zeroing step to remove the stray resistance and bias voltage caused by the test lead or external environment factors.
The measured resistance value may be very small, such as 3mΩ and 30mΩ range. When the test current flows through the resistance, the voltage signal generated will be very weak, and the maximum is only a few mV, so the position, length, and shape of the test lead may all have effects on the measurement. Therefore, the positions and conditions during setting zero should be the same as those during subsequent measurements.
3.3.1 Short-Circuit Test

• Method of Short Circuit Zeroed****
  The first step| push【Utility】key to enter the setup page
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  The second step| the short contact test pen
  The third step| use the function key to select【F4 SET ZERO】
  The fourth step| push【F4 OK】, the instrument start to zeroing
  The fifth step| When zeroing is finished, go back to the setup page

Correct Short Circuit Method of Crown Probe Test Pen
The center probe of the crown probe test pen is the Sense end, and the outer cylindrical probe is the Source end.
First, place the probes of the crown probe test pen as shown in Figure 3-3-1-a. Make sure that the surface of the object at the red dot is in contact, that is, the center probe is in contact with the center probe (Sense and Sense). And the center probe is in contact with the peripheral probe (Sense and Source). Second, apply force in the direction of the arrow shown in Figure 3-3-1-b to make the surface of the object at the third red point contact, that is, the periphery probe is in contact with the peripheral probe (Source and Source). Finally, only when the three red dots as shown above are actually touched, the next setting zero steps can be performed.

[Test] Measurement Page

4.1 page