Unit UT385 User manual

Laser Power
Meter
User Manual
P/N:110401109388X

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.
Uni-Trend guarantees that the product is free from any defect in material and workmanship within
one year 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.
UT 385 User Manual
Preface
Limited Warranty and Liability

1. INTRODUCTION
UT385 laser power meter is stable, safe and reliable tool for applications such as
laboratories, laser device manufacturers and industrial enterprises.
2. FEATURES
Precise laser sensor
Split design with retractable spring wire, which is easy to operate
LCD screen for clear readings
Data storage function
Selectable and customizable wavelengths
Threshold alarm function
Low power consumption
3. ACCESSORIES
Open the package and check if any item below is missing or damaged.
Device ---------------------------------- 1
9V battery ----------------------------- 1
English manual ---------------------- 1
USB cable ----------------------------- 1
UT 385 User Manual UT 385 User Manual
1. Introduction ----------------------------------------------------------------------------- 2
2. Features --------------------------------------------------------------------------------- 2
3. Accessories ----------------------------------------------------------------------------- 2
4. Safety instruction ---------------------------------------------------------------------- 3
5. Structure description ------------------------------------------------------------------ 4
6. Lcd functions ---------------------------------------------------------------------------- 5
7. Buttons description -------------------------------------------------------------------- 7
8. Operation instruction ------------------------------------------------------------------ 9
9. Operation steps and notices ------------------------------------------------------- 14
10. Parameters and specifications ---------------------------------------------------- 15
11. Online measurement ----------------------------------------------------------------- 17
12. Battery replacement ----------------------------------------------------------------- 18
Table of Contents

4. SAFETY INSTRUCTION
1) Never stare into the laser beam directly or expose eyes to the reflected laser light, otherwise
eyesight impairment or even blindness may occur. Especially the high-frequency laser, such as
UV-light, is invisible by naked eyes and requires extra attention.
2) No laser over 40mW is allowed to input, the sensor may be damaged by high-power laser.
3) To avoid inaccurate measurement, please keep the sensor illuminated surface clean and free
from scratch and contamination.
4) Check the device and accessories for any damage or abnormality before usage. Do not operate
the product if you find it damaged obviously, no display or you suspect it is faulty.
5) Operating instruction must be followed during measurement.
6) Do not open the meter shell or change the internal circuit to avoid damage to the meter.
7) Users should change the battery in time when the icon blinks on LCD. Remove the batteries
during long-time storage to avoid battery leakage.
8) Do not use or store the meter in the environment of high temperature, high humidity, flammable,
explosive or intense electromagnetic.
9) Clean the meter shell with a soft damp cloth and neutral detergent. Do not use abrasive or solvents,
to protect the meter from corrosion.
5. STRUCTURE DESCRIPTION
① Device
② Buttons
③ LCD screen
④ USB interface
⑤ Sensor illuminated window (laser entrance)
⑥ Sensor protection cover
⑦ Probe handle
⑧ Probe handle holder
⑨ Spring wire
UT 385 User Manual UT 385 User Manual

6. LCD FUNCTIONS Maximum measurement
Minimum measurement
Average measurement
Secondary display area for maximum,
minimum, average value and so on
Data storage number
Data storage icon
Wavelength unit nm
Wavelength value
Wavelength icon
Customized wavelength number 1
Customized wavelength number 2
Date and time
Lower limit icon
Main display area
Upper limit icon
Audio alarm
Data hold
Relative value
Auto range
USB connection
Auto power off
Battery status
Unit μW (main display area)
Unit mW (main display area)
Decibel unit dBm (main display area)
Unit μW (secondary display area)
Unit mW (secondary display area)
Unit dBm (secondary display area)
Simulation bar
Delete data
Obtain relative value
UT 385 User Manual UT 385 User Manual

7. BUTTONS DESCRIPTION
1) : Power on/off
In power off status, long press the button 1s to power on
In power on status, long press it 1s to turn on/off auto power off, short press to power off.
2) HOLD/ : HOLD/Backlight
Short press it to enter/exit HOLD mode. Long press it to turn on/off the backlight.
3) MODE: MAX/MIN/AVG modes
Short press it to switch between Maximum/Minimum/Average modes, and long press it to exit.
4) REL: Relative Value
Long press it to obtain relative value. Short press it to enter/exit the relative value mode.
5) : Settings
Short press it to enter setting mode. Short press or to switch the setting item according to the
codes below.
S.dt: set date and time
S.dlt: set lower limit threshold
S.ult: set upper limit threshold
rSt?: restore settings
dEL?: delete saved data
Short press button to exit the setting mode.
Short press button to enter the according item’s setting.
6) : Up/Audio Alarm
In normal measurement mode, long press the button to turn on/off audio alarm, and short press it to
switch between upper/lower/upper and lower limit test modes or exit.
In setting mode, short press it to switch setting item or increase setting value.
Note: only upper limit will be detected when the icon displays, and only lower limit will be
detected when the icon displays. Both the icons will be displayed when upper and lower
limit test modes are turned on simultaneously.
7) : Switch units and Auto Range
Short press the button to switch between μw/mW/dBm/auto range modes.
Note: the icon displays during auto range mode, otherwise it is in manual range.
8) : Review/Return
Short press the button to enter storage data review mode or return.
UT 385 User Manual UT 385 User Manual

9) : Save/Down
In normal measurement mode, long press the button to save the current measured value, the icon
will blink if 199 groups of data storage have been fulfilled. Short press it to check the date and
time. In setting mode, short press the button to switch setting item or decrease setting value.
10) : Wavelength/confirm
In normal measurement mode, short press the button to switch laser wavelength, and long press it
to enter wavelength setting.
In date and time setting, short press this button to switch the digit position.
In setting mode, short press this button to confirm selection or enter the item.
8. OPERATION INSTRUCTION
1) Date and Time Setting
Short press to enter setting interface, switch to S.dt and short press to enter date and time
setting interface as figure below:
Short press and button to adjust setting value (long press to rapidly adjust). Short press to
move the cursor to the left, while short press to move the cursor to the right.
After the setting is done, short press button, the blinking of the icon means the date and time
setting is saved, then short press to exit.
2) Upper/lower Limit Threshold Setting
Short press to enter setting interface, select S.dlt and short press to enter lower limit threshold
setting interface as figure below:
In setting interface, select S.ult and short press to enter upper limit threshold setting interface as
figure below:
UT 385 User Manual UT 385 User Manual

Short press and button to adjust setting value (long press to rapidly adjust).
After the setting is done, short press the button to confirm and save the setting, or short press
the button to exit and not to save.
3) Relative Value Mode
Long press REL button to set current measured value as relative value and displays it in the
secondary display area, as shown in figure:
Short press REL button can enter relative value mode. It will subtract the relative value from the
actual measuring value, the difference will be displayed in main display area as shown in figure:
4) Customized Wavelength Setting
Long press to enter customized wavelength setting interface, 2 customized wavelength can be
save as and , which can be switched by and button.
Short press to enter wavelength setting mode, the icon λ on LCD will blink as figure below:
Short press or long press or button to set customized wavelength.
Short press to save the current setting wavelength, the showing of icon means the wavelength
setting is saved, then short press to exit.
UT 385 User Manual UT 385 User Manual

5) Review or Delete Storage Value
Short press button to enter data review mode as shown in figure.
For example, the current storage data is:
A.The storage serial number is 2.
B.The measured data is 0.1μW.
C.The wavelength is 650nm.
D.The measured time is 09:04 (24-hour) 2nd December, 2019
Short press and to switch storage data. Short press button to select specified data as
figure below:
Then short press button again to delete specified data, short press to cancel deleting.
After setting, short press button to exit.
9. OPERATION STEPS AND NOTICES
1) Power on the meter.
2) Aim the laser at the middle illuminated surface of the sensor and keep the laser angle with the
illuminated surface 90°, at this point, the reading is the measured laser power. to be
3) According to the laser type, in case the measured laser output will be influenced by reflected
light of illuminated surface, please twist the angle a little bit to avoid the direct reflection on the
laser port.
4) In weak laser measurement (<1nW), in order to avoid the affection of the light interference such
as ambient light, it should be operated in a dark room.
UT 385 User Manual UT 385 User Manual
to be

10. PARAMETERS AND SPECIFICATIONS
1) Main Parameters
Function
Laser
power
Measured
range
Accuracy
Measured
range
Laser
wavelength
range
Laser
wavelength
options
Range Resolution Accuracy Remarks
The meter
calibrates
by the
wavelength
of 633nm
Formula:dBm=10*lg (mW)
2) General Specifications
LCD display: 4-digit LCD display, maximum display value: 3999
Over-range indication: OL will be displayed when the laser power exceeds the range of 39.99mW.
MAX/MIN/AVG mode: maximum/minimum/average value and the icon of MAX/MIN/AVG will be
displayed in MAX/MIN/AVG mode.
Data hold function: the icon of HOLD will be displayed during data hold.
Backlight: backlight can be turned on/off manually.
Auto power off: the meter will automatically shut down if no action was detected out within
5 minutes and auto power off can be turned off.
Sampling rate: 0.5s
Data storage: maximum 199 sets of data can be saved.
Impact resistance: 1m drop proof
Battery requirement: 1*9V battery, new battery should be replaced in time if the low battery
icon shows on LCD.
Product size: 198*104*35mm
Weight: 319g (includes battery)
UT 385 User Manual UT 385 User Manual