UNI-T UTP3303-II DC Power Supply User Manual

: June 9, 2024
: UNI-T

Table of Contents

UNI-T UTP3303-II DC Power Supply
Safety Information
Safety Terms and Symbols
- Safety Symbols
Front and Rear Panel
Operation
- Operation of Constant Voltage
- Operation of Constant Current
Technical Parameters
General Maintenance
Documents / Resources
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)

UNI-T UTP3303-II DC Power Supply

UNI-T-UTP3303-II-DC-Power-Supply-PRODUCT

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.

Limited Warranty and Liability

Uni-Trend guarantees that the product is free from any defect in material and workmanship within three years from the purchase date. This warranty does not apply to damages caused by accident, negligence, misuse, modification, contamination or improper handling. The dealer shall not be entitled to give any other warranty on behalf of
Uni-Trend. If you need warranty service within the warranty period, please contact your seller directly.
Uni-Trend will not be responsible for any special, indirect, incidental or subsequent damage or loss caused by using this device.

Safety Information

Safety Precaution

Please read the following instructions carefully before operation to ensure your personal safety and prevent the instrument from damage. The safety
instructions apply to all the operators and staff.

Safety Terms and Symbols

WARNING: Used to indicate the correct operation or maintenance procedures, avoiding damages or destruction of the instrument and other properties.
CAUTION: Identify the potential hazards that require correct procedures and practices to avoid personnel injuries.

Safety Symbols

Caution! Refer to Manual Protective Ground Terminal

Front and Rear Panel

UNI-T-UTP3303-II-DC-Power-Supply-
FIG-2

Models: UTP3303-ll/3305-II
Voltage display of CH1
Voltage display of CH2
The indicator of CH3 will turn red if the load current exceeds the rating value
Power switch : press to power the instrument on or off
CH1 voltage positive output terminal (red)
CH1 voltage negative output terminal (black)
Ground terminal (GND green)
CH2 voltage positive output terminal (red)
CH2 voltage negative output terminal (black)
CH3 voltage positive output terminal (red)
CH3 voltage negative output terminal (black)
CH2 voltage adjustment knob, which is to adjust the output voltage
OUTPUT button, press it to enable output mode
OUTPUT indicator, green indicates the output mode
CH2 current adjustment knob, which is to adjust the output current
Series/parallel mode buttons
CH1 current adjustment knob, which is to adjust the output current
CH1 voltage adjustment knob, which is to adjust the output voltage
The current display of CH2
The current display of CH1
CC/CV indicator of CH2
CC/CV indicator of CH1
Power supply input interface
Input voltage switcher
Cooling fan outlet

Operation

WARNING

a) Before connecting with AC power source, please select corresponding voltage scale by AC SELECTOR on rear panel, and then check if the fuse specification matches the requirement of scale.
b) Connect the protective ground terminal to the ground.

Boot Inspection

a) Adjust the current knob clockwise to the maximum.
b) Turn on the AC power source switch, the screen and CV indicator will be lightened.
c) Adjust the voltage knob counter clockwise to the minimum 0V, and then turn clockwise to adjust the output voltage to the maximum.
d) Press the OUTPUT button to enable the output of power supply, adjust the current knob counter clockwise to the minimum, and then adjust the knob clockwise to the maximum. This is to ensure the current value can be adjusted to maximum rated value from 0.

Operation of Constant Voltage

Operate constant voltage mode (CV mode) as steps below:

a) Power the instrument on, adjust the voltage knob to output voltage (open circuit), then the CV indicator should be lit up.
b) Adjust maximum output of current (current limit). In actual operation, if the current exceeds the limit due to load change, the instrument will automatically switch to the constant current mode, and the ratio of output voltage will drop.

Operation of Constant Current

Operate constant current mode (CC mode) as steps below:

a) Adjust the current knob counter clockwise to the minimum, ensure the output current is 0A, and power the instrument on.
b) In no-load connection, adjust the maximum output of voltage (voltage limit) as certain load condition. In actual operation, if the voltage exceeds the limit due to load change, the instrument will automatically switch to the constant voltage mode, and the preset voltage limit and the ratio of output current will drop .
c) Press the OUTPUT button to output DC voltage.

Independent/tracking mode

Independent mode, series tracking mode and parallel tracking mode can be switched by 2 buttons (series/parallel mode buttons) as steps below
a) In independent mode, if both the buttons are released (OFF INDEP), CH1 and CH2 are independent from each other.
b) If the upper button is pressed (ON SE RIE S), and the lower button is released, the instrument enters series tracking mode.
Voltage outputs from CH1 positive output terminal (red) and CH2 voltage negative output terminal (black), and the settings of parallel voltage and current can only be adjusted by CH1. Total voltage is the CH1 voltage plus the CH2 voltage, and the current is equal to CH1 current.
c) If both the buttons are pressed (ON PARALLEL), the instrument enters parallel tracking mode.
At this time, CH+ is the positive output terminal of parallel, and CH- is the negative output terminal of parallel. CH1 is main channel and CH2 is slave. Parallel voltage and current can only be adjusted by CH1. Total parallel voltage is equal to the voltage of CH1, total parallel current is the CH1 current plus the CH2 current. In the no-load condition, it is normal when non- return to zero (N TR) appears.
d) When the temperature of transformer reaches set value, the internal temperature switch will be disconnected. The instrument will be operational if the temperature drops and the switch connects again.

Technical Parameters

Rated Operating Conditions

Voltage of power supply: AC 110V/120V/220V/230V 50Hz/60Hz
Operating conditions: temperature 0-40°C, relative humidity85%RH
Storage conditions: temperature -10-60°C, relative humidity 80%RH

Specifications

Models	UTP3303-II	UTP3305-II
Rated voltage (CH1/CH2)	0-32V	0-32V
Rated current (CH1/CH2)	0-3A	0-5A
Output power	207W	335W

Load regulation

| Voltage: <0.01%+3mV
Current: 0.2%+3mA
Power supply regulation (0-30V)| Voltage: <0.01%+3mV
Current: 0.1%+3mA| Current: <0.1%+5mA

Setting resolution

| Voltage: 10mV
Current: 1mA

Read-back resolution

| Voltage: 10mV
Current: 1mA

Setting/read-back accuracy (25°C±5°C)

| ****

Voltage: ±(0.1% of reading+30mV)

Current: ±(0.3% of reading+5mA)| Current: ±(0.3% of reading+10mA)
Ripple and noise (20Hz-20MHz)| Voltage: 1mVrms
Current: 3mArms

Temperature coefficient

| Voltage: 300ppmf’ C
Current: 300ppmf’ C

Recovery time

| <100µs

(load fluctuation: 50%, minimum load: 0.5A)

CH3 output features

| Voltage: 5.0V
Current: 3A
Load regulation: 3%+5mV
Power regulation: 5mV
Ripple: <2mV
Power consumption| 450W| 700W

Safety

| Voltage withstand: 1mA 10S (power input – GND AC1800V)
---|---
Insulation resistance: 300MO@ 500V: AC input to the shell
Insulation resistance: 300MO@ 500V: AC input to the DC output terminal
Display type| 4-digit LED display
Voltage of power supply| AC 110V/120V/220V/230V
Frequency| 50Hz/60Hz
Product size| 319mm146mm226mm
Product net weight| 9.2kg| 10.5kg
Certification| CE

Main Features

High-precision 4-digit voltage and current display 10mV/1mA
Multi-turn potentiometer set voltage and current value
Temperature-controlled fan
Protections of OVP, OTP and reverse polarity
Voltage preset value function

General Maintenance

WARNING

The maintenance instruction is only for the qualified maintenance personnel. To avoid electric shock, no maintenance outside the instruction is allowed.

Fuse Replacement

If the fuse is blown, CV indicator can’t be lit up and the power supply fails to run. Confirm the cause of the blown fuse before replacing the fuse, correct the problem, then replace the fuse by a same one as specifications. Factory-prepared spare fuse is in the input socket of rear panel.

WARNING

To prevent fires, only replace with fuses that meet the model and rating value. Do not connect the AC power source before replacing the fuse to avoid electric shock.

The voltage of Power Source

The product allows voltage of AC110V/120V/220V/230V 50/60Hz, but the voltage scale should consist with output voltage.
a) Make sure the power source cable is disconnected.
b) Adjust the voltage switch to the required scale to meet various requirements.

Model	AC input voltage	Voltage selector	Fuse type

UTP3303-II

UTP3305-II

Cleaning

Please clean the instrument with a damp soft cloth and mild detergent, but never spray the detergent directly to the instrument to prevent damage. Do not use abrasives or solvents like hydrocarbon and chlorine!

UNI-T.
UNI-TRENDTECHNOLOGV (CHINA) CD.,LTD.
No. 6, Gong Ye Bei 1st Road,
Songshan Lake National High-Tech Industrial Development Zone, Dongguan City,
Guangdong Province, China
Made in China