Unit UT3200+ Series User manual

User’s Manual
UT3200+ Series Multi-channel Temperature Tester

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Foreword
Dear Users,
Hello! Thank you for choosing this brand new UNI-T instrument. In order to use this instrument safely and
correctly, please read this manual thoroughly, especially the Safety Requirements part.
After reading this manual, it is recommended to keep the manual at an easily accessible place, preferably
close to the device, for future reference.
Warranty Service
Copyright is owned by Uni-Trend Technology (China) Co., Ltd.
If the original purchaser sells or transfers the product to a third party within three year from the date of
purchase of the product, the warranty period of three year shall be from the date of the original purchase
from UNI-T or an authorized UNl-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 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 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 obtain the warranty service, customer must inform the defects
within the applicable warranty period to UNI-T, and perform appropriate arrangements for the warranty

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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 products 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 or damages caused by accidental, machine parts’ wear and tear,
improper use, and improper or lack 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 repair damage caused by improper use or connection to an incompatible device.
c) Any damage or malfunction caused by the use of a power source which does not conform to the
requirements of this manual.
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 merchant ability or applicability
purposes.
For violation of this guarantee, 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 the damages.
Trademark
UNI-T is the registered trademark of Uni-Trend Technology (China) Co., Ltd.

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Statement
UNI-T products are protected by patent rights in China and foreign countries, including issued and
pending patents.
UNI-T reserves the rights to any product specification and pricing changes.
UNI-T reserves all rights. Licensed software products are properties of Uni-Trend and its subsidiaries
or suppliers, which are protected by national copyright laws and international treaty provisions.
Information in this manual supersedes all previously published versions.
1. Introduction
This manual includes safety requirements, installment and the operation of UT3200+ series multi-channel
temperature tester.
2. Safety Requirements
This section contains information and warnings that must be followed to keep the instrument operating
under safety conditions. In addition, user should also follow the common safety procedures.
Safety Precautions
Warning
Please follow the following guidelines to avoid possible electric shock and risk to
personal safety.
Users must follow the following conventional safety precautions in operation, service
and maintenance of this device. UNI-T will not be liable for any personal safety and
property loss caused by the user’s failure to follow the following safety precautions.
This device is designed for professional users and responsible organizations for
measurement purposes.
Do not use this device in any way not specified by the manufacturer. This device is only
for indoor use unless otherwise specified in the product manual.
Safety Statement
Warning
“Warning” indicates the presence of a hazard. It reminds users to pay attention to a
certain operation process, operation method or similar. Personal injury or death may
occur if the rules in the “Warning” statement are not properly executed or observed. Do

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not proceed to the next step until you fully understand and meet the conditions stated in
the “Warning” statement.
Caution
“Caution” indicates the presence of a hazard. It reminds users to pay attention to a
certain operation process, operation method or similar. Product damage or loss of
important data may occur if the rules in the “Caution” statement are not properly
executed or observed. Do not proceed to the next step until you fully understand and
meet the conditions stated in the “Caution” statement.
Note
“Note” indicates important information. It reminds users to pay attention to procedures,
methods and conditions, etc. The contents of the “Note” should be highlighted if
necessary.
Safety Sign
Danger
It indicates possible danger of electric shock, which may cause
personal injury or death.
Warning
It indicates that you should be careful to avoid personal injury or
product damage.
Caution
It indicates possible danger, which may cause damage to this device
or other equipment if you fail to follow a certain procedure or
condition. If the “Caution” sign is present, all conditions must be met
before you proceed to operation.
Note
It indicates potential problems, which may cause failure of this
device if you fail to follow a certain procedure or condition. If the
“Note” sign is present, all conditions must be met before this device
will function properly.
AC
Alternating current of device. Please check the region’s voltage
range.
DC
Direct current device. Please check the region’s voltage range.
Grounding
Frame and chassis grounding terminal
Grounding
Protective grounding terminal
OFF
Main power off
ON
Main power on
Power Supply
Standby power supply: when the power switch is turned off, this
device is not completely disconnected from the AC power supply.
CAT I
Secondary electrical circuit connected to wall sockets through
transformers or similar equipment, such as electronic instruments
and electronic equipment; electronic equipment with protective
measures, and any high-voltage and low-voltage circuits, such as the
copier in the office.

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CAT II
Primary electrical circuit of the electrical equipment connected to
the indoor socket via the power cord, such as mobile tools, home
appliances, etc. Household appliances, portable tools (e.g. electric
drill), household sockets, sockets more than 10 meters away from
CAT III circuit or sockets more than 20 meters away from CAT IV
circuit.
CAT III
Primary circuit of large equipment directly connected to the
distribution board and circuit between the distribution board and the
socket (three-phase distributor circuit includes a single commercial
lighting circuit). Fixed equipment, such as multi-phase motor and
multi-phase fuse box; lighting equipment and lines inside large
buildings; machine tools and power distribution boards at industrial
sites (workshops).
CAT IV
Three-phase public power unit and outdoor power supply line
equipment. Equipment designed to “initial connection”, such as
power distribution system of power station, power instrument, front-
end overload protection, and any outdoor transmission line.
Certification
CE indicates a registered trademark of EU
Certification
UKCA indicates a registered trademark of UK
Certification
ETL indicates a registered trademark of Intertek.
Waste
This product complies with the marking requirements of WEEE
Directive (2002/96/EC). This additional label indicates that this
electrical / electronic product must not be discarded in household
waste.
EFUP
This environment-friendly use period (EFUP) mark indicates that
dangerous or toxic substances will not leak or cause damage within
this indicated time period. The environment-friendly use period of
this product is 40 years, during which it can be used safely. Upon
expiration of this period, it should enter the recycling system.
Safety Requirements
Warning
Preparation before use
Please connect this device to AC power supply with the power cable
provided.
The AC input voltage of the line reaches the rated value of this
device. See the product manual for specific rated value.
The line voltage switch of this device matches the line voltage;
The line voltage of the line fuse of this device is correct.
Check all terminal rated
values
Please check all rated values and marking instructions on the product
to avoid fire and impact of excessive current. Please consult the
product manual for detailed rated values before connection.
Use the power cord
properly
You can only use the special power cord for the instrument approved
by the local and state standards. Please check whether the insulation

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layer of the cord is damaged or the cord is exposed, and test whether
the cord is conductive. If the cord is damaged, please replace it
before using the instrument.
Instrument Grounding
To avoid electric shock, the grounding conductor must be connected
to the ground. This product is grounded through the grounding
conductor of the power supply. Please be sure to ground this product
before it is powered on.
AC power supply
Please use the AC power supply specified for this device. Please use
the power cord approved by your country and confirm that the
insulation layer is not damaged.
Electrostatic prevention
This device may be damaged by static electricity, so it should be
tested in the anti-static area if possible. Before the power cable is
connected to this device, the internal and external conductors should
be grounded briefly to release static electricity. The protection grade
of this device is 4 kV for contact discharge and 8 kV for air discharge.
Measurement accessories
Measurement accessories are of lower class, which are definitely not
applicable to main power supply measurement, CAT II, CAT III or CAT
IV circuit measurement.
Use the input / output port
of this device properly
Please use the input / output ports provided by this device in a
properly manner. Do not load any input signal at the output port of
this device. Do not load any signal that does not reach the rated value
at the input port of this device. The probe or other connection
accessories should be effectively grounded to avoid product damage
or abnormal function. Please refer to the product manual for the
rated value of the input / output port of this device.
Power fuse
Please use power fuse of specified specification. If the fuse needs to
be replaced, it must be replaced with another one that meets the
specified specifications by the maintenance personnel authorized by
UNI-T.
Disassembly and cleaning
There are no components available to operators inside. Do not
remove the protective cover.
Maintenance must be carried out by qualified personnel.
Service environment
This device should be used indoors in a clean and dry environment
with ambient temperature from 0℃to 40℃.
Do not use this device in explosive, dusty or humid air.
Do not operate in humid
environment
Do not use this device in a humid environment to avoid the risk of
internal short circuit or electric shock.
Do not operate in
flammable and explosive
environment
Do not use this device in a flammable and explosive environment to
avoid product damage or personal injury.
Caution
Abnormality
If this device may be faulty, please contact the authorized
maintenance personnel of UNI-T for testing. Any maintenance,

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adjustment or parts replacement must be done by the relevant
personnel of UNI-T.
Cooling
Do not block the ventilation holes at the side and back of this device;
Do not allow any external objects to enter this device via ventilation
holes;
Please ensure adequate ventilation, and leave a gap of at least 15 cm
on both sides, front and back of this device.
Safe transportation
Please transport this device safely to prevent it from sliding, which
may damage the buttons, knobs or interfaces on the instrument
panel.
Proper ventilation
Poor ventilation will cause the device temperature to rise, thus
causing damage to this device. Please keep proper ventilation during
use, and regularly check the vents and fans.
Keep clean and dry
Please take actions to avoid dust or moisture in the air affecting the
performance of this device. Please keep the product surface clean
and dry.
Note
Calibration
The recommended calibration period is one year. Calibration should
only be carried out by qualified personnel.
3. Product Overview
UT3200+ series multi-channel temperature tester includes six models UT3208+, UT3216+, UT3224+,
UT3232+, UT3240+ and UT3248+, which respectively corresponding to 8, 16, 24, 32, 40 and 48 channels. User
can purchase the temperature tester according to their needs.
UT3200+ series adopts 4.3 inch LCD and support J, K, T, E, S, N, B, R thermocouple input. Multi-channel
temperature data can be collected at the same time, with intuitive numerical reading, histogram and curve
chart display, so that user can read the parameter with multiple modes or save the data in USB. The
instrument has the alarm for over upper/lower limit and communication transmission function. Its perfect
function and performance can meet the needs of production, laboratory and R&D measurements.
The instrument is equipped with RS232C interface, data acquisition, analysis and printing can be realized
through the standard computer software. The instrument supports real-time storage of sampling data. User
can calibrate data of each channel independently.It widely used in lighting appliances, electric tools,
household appliances, electric motors, electric heating appliances, medicine, petroleum, chemical,
metallurgy, electric power industries and scientific research institutions in the field of production lines,
laboratories, quality control departments.

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3.1 Specifications and Functions
Item
Description
Display
Direct numerical reading
Curve chart
Histogram
Measurement
Thermocouple type: J, K, T, E, S, N, B, R
Test Range: -200.0℃~1800.0℃(the range will change with different thermocouple
model)
Resolution: 0.01
Number of channel: 8~48 (channel is configured according to different model)
Test speed: Slow, Fast
Main
Functions
Sorting: built-in sorting data can set the upper/lower limit for the temperature of each
channel
Beep: alarm for over the upper/lower limit
Calibration: user can set calibration for the data of each channel
Lock key
Print screen key
Storage
FAT: user can creat the file with the suffixal【.csv】and save the data of each channel
into USB (not support mobile hard disk)
Interface
RS232C communication interface
LAN communication interface
Remote
Control
Baud rate supports up to 115200bps and compatiable with SCPI protocol and ASCII
transmission
System Setup
Chinese, English
Date, time and key sound
Environmental
Temperature
Temperature: 15℃~35℃, humidity <80%RH
Operating: temperature 10℃~40℃, humidity 10~90%RH
Storage temperature 0℃~50℃, humidity 10~90%RH
Size
214mm*88.2*330.3mm
Weight
3.4kg (net weight)
3.2 Accuracy of Instrument
The accuracy of cold junction compensation is ±0.5℃.
The measurement accuracy of different thermocouple is shown as the following table.
The measurement accuracy divides into three parts: cold junction compensation, the

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measurement accuracy of the instrument (it is different when using different thermocouple)
and the measurement accuracy of thermocouple.
The measurement accuracy of thermocouple is subject to the standard of manufacturer.
Sensor Model
Temperature (℃)
Accuracy (℃)
Type T thermocouple
-150℃-0℃
±1.0℃
0℃-400℃
±0.8℃
Type K thermocouple
-100℃-0℃
±1.2℃
0℃-1350℃
±0.8℃
Type J thermocouple
-100℃-0℃
±1.0℃
0℃-1200℃
±0.7℃
Type N thermocouple
-100℃-0℃
±1.5℃
0℃-1300℃
±0.9℃
Type E thermocouple
-100℃-0℃
±0.9℃
0℃-850℃
±0.7℃
Type S thermocouple
0℃-100℃
±4.5℃
100℃-300℃
±3.0℃
300℃-1750℃
±2.2℃
Type R thermocouple
0℃-100℃
±4.5℃
100℃-300℃
±3.0℃
300℃-1750℃
±2.2℃
Type B thermocouple
600℃-800℃
±5.5℃
800℃-1000℃
±3.8℃
1000℃-800℃
±2.5℃

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3.3 Main Characteristics
4.3 inch true color LCD
Wide range of adaptability, supports Type K/N/E/J/T/R/S/B thermocouple
Measurement range: -200℃-1800℃
The main parameters of the temperature test are displayed in 6 digits, and the resolution is 0.01℃.
Two scanning rate: fast (according to different model), slow
Automatic detection of open-circuit thermocouple
Direct numerical value reading, histogram and curve chart display mode.
Cold junction compensation
8G USB and USB HOST interface, USB storage
File management can keep the current setup of the instrument.
The instrument is equipped with Type K thermocouple test line 2 meters, it can measure the
temperature range -20℃-200℃.
Alarm for over upper/lower limit. Alert for reading changing of over-limit. The upper limit and lower
limit of temperature data in each channel can be set.
RS-232C, LAN, DC24V external power supply interface. Supports SCPI and MODBUS RTU protocol.
It suitable for standard 2U cabinet.
4. Panel Overview
4.1 Front Panel
Figure 4-1 Front Panel

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No.
Picture
Description
1
Power supply switch (slight touch); The indicator is yellow when power
is ON. The indicator is red when power is OFF.
2
Functional key
3
Exit key for cancel/return
Press this key to capture screenshot and save in USB when USB inserts
in the instrument.
4
Arrow key is used to move the cursor
Enter key is used to confirm the input value.
5
Numeric keypad is used to input numerical value; The add, subtract,
delete key is used to add, subtract, and delete.
6
Test key is used to display the test result.
Setup key is used to set the measurement parameter
Lock key is used to invalidate the key. Long press 1s to unlock the key.
7
Emblem
8
USB interface
9
4.3 inch LCD
Table 4-1 Interface Display and Symbol
Symbol
Description
USB is insert the instrument and it can save the data or capature the
scrennshot to save.
Key sound is enabled.
Comparator is enabled.
Unlock the key
Lan interface
℃
, K,
℉
The unit of the current temperature
Blinking character indicates the instrument is data acquiring.

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4.2 Rear Panel
Figure 4-2 Rear Panel(Take UT3232+ as an example)
No.
Description
1
Data acquisition module
UT3208+/UT3216+/24+/32+/40+/48+ is equipped with data acquisition module1/2/3/4/5/6
2
AC power socket (not contain fuse) the fuse is inside the instrument
3
RS232C communication interface
4
DC 24V power supply interface
5
LAN communication interface
5. Inspection and Installation
5.1 Packing List
Before using the instrument,
1. Check the appearance whether is damaged or scratched;
2. Check the packing list if has loss.
If the product is damaged or accessory is missing, please contact UNI-T sales department or
distributor.
Article
Quantity
Remarks
Multi-channel
Temperature Tester
1 pcs
The actual model is subject to the
order.
Power Line
1 pcs
8G USB
1 pcs

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8-channel
Temperature Test
Module
Match with
model
UT3208+/16+/24+/32+/40+/48+ is
respectively equipped with
1/2/3/4/5/6 group.
RS232C
Communication line
1 pcs
User’s Manual
Electronic file can download from
UNI-T official website.
5.2 Power Requirements
UT3200+ series multi-channeltemperature tester can only be used under the power conditions
as the following.
Voltage: 100V-240VAC
Frequency: 50/60Hz
Power: the maximum 10VA
Warning: To prevent electric shock, please make sure that the power line is securely
connect to the ground.
5.3 Operation Environment
UT3200+ series multi-channel temperature tester can only be used under the environmental
conditions as the following.
Temperature: 10℃~40℃
Humidity:10~90%RH
Altitude:0~2000 meters
5.4 Cleaning
To prevent electric shock, unplug the power line before cleaning.
Use clean cloth with slight water to wipe outer shell and panel and keep it dry. Don’t let water enters
the instrument.
Do not clean the external of the instrument.
Caution: Do not use solvent (alcohol or gasoline) to clean instrument.
5.5 Handle
Handle is adjustable and can adjust to four positions, hold two sides of the handle to pull or

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rotate as shown in the following figure.
Figure 5-1 Original Position Figure 5-2 Test Position
Figure 5-3 Remove Handle Figure 5-4 Lift Position
6. Measurement Preparation
6.1 Power On
Connecting standard power line to make sure that the instrument is power on normally.
Power supply switch in the lower left on the panel, it is a slight electronic switch. Indicator
is yellow, indicating that the power of the instrument is enabled.
After confirming that the instrument is powered on, please turn off the power button. At this time, the
power indicator will appear red.
Warning: Please make sure that the power voltage is matched with supply voltage.
Otherwise, the instrument may burnout.
The main power plug must connect to the power socket with protective grounding.
Do not use the wire board without protective grounding.

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6.2 Test Line and Installation
The instrument is equipped with Type K thermocouple test line as shown in Figure 6-1 8-
channel test module. Each 8-channel temperature test module includes 8 test line, so that it
can measure the temperature of 8 channels at the same time. Type and specification of test
module is as follows.
Type and name: UT-T21M 8-channel test module
Type K thermocouple
Length: 2 meters×8
Temperature range of Type K test line: 0~200℃
Accuracy: ±1.5℃
Figure 6-1 8-channel Test Module
Note: Please make sure that the temperature of DUT is within the range of the test line before
connecting the test probe to DUT.
Test module
UT3208+/16+/24+/32+/40+/48+ is respectively equipped with 1/2/3/4/5/6 group.
Installation Steps
Ensure that the power of the instrument is shunt down before connecting the test line to the port of
data acquisition module at the rear.
1. As shown in Figure 6-2, place the test line interface face up and keep it with the data
acquisition module port of the instrument on same level.
2. As shown in Figure 6-3, plug test line into eight slots of the instrument.
3. Other channel is connecting as the same way.
Figure 6-2 Data Acquisition Module Port of Instrument

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Figure 6-3 Test Line Port
Caution: The isolation voltage between channels is 350V DC and 230V AC.
6.3 Channel Indentifier
The product is equipped with paster to distinguish different channels with the channel number
01, 02...etc. Users can stick them on different test lines according to their needs, as shown in
the figure.In order to better distinguish the matching relationship between the measurement
object and the channel number of the instrument.
Figure 6-4 Channel number of each channel in the acquisition module of the temperature
tester, take UT3232 as an example.
Data acquisition module in the first row on the left, it corresponds to CH01, CH02, CH03...CH08
from down to up.
Data acquisition module in the second row on the left, it corresponds to CH09, CH10,
CH11...CH16 from down to up.
Data acquisition module in the third row on the left, it corresponds to CH17, CH18, CH19...CH08
from down to up.
Data acquisition module in the fourth row on the left, it corresponds to CH25, CH26,
CH27...CH32 from down to up.
Data acquisition module in the fourth row on the left, it corresponds to CH25, CH26,
CH27...CH32 from down to up.
Data acquisition module in the fifth row on the left, it corresponds to CH33, CH34, CH35...CH40
from down to up.
Data acquisition module in the sixth row on the left, it corresponds to CH41, CH42, CH43...CH48
from down to up.

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Data acquisition module of other Instruments are sorted in the same way.
Figure 6-4 UT3232 Channel Number in Acquisition Module of Temperature Tester
6.4 USB
Instrument is equipped with an 8G USB, USB recording function is only valid in <Test>,
<Histogram> and <Curve Chart> page.
Before starting data collection, insert USB into instrument interface and wait the instrument
indentify USB and then press start key, data will be record in file .
Curve chart and histogram can refer to section 4.5.
It is recommended to use brand USB to avoid the problem of incompatible identification. The
format and capacity of the USB can be referred to FAT, FAT32 and EXFAT, with the maximum
capacity of 128G.
6.5 Operation Guide
This section is to describe how to use multi-channel temperature test to measure DUT. It is
necessary to make full preparation before testing according to the actual situation.
Connect the power line correctly.
Turn on the switch of the instrument, the screen will light up. Check the contact lines of
each temperature are connected well. Starts to data acquisition, if the connection is
wrong then no temperature display on this connection line; if the connection is normal,
temperature will display (environment temperature).

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Insert USB into port of the instrument.
Select the test part and fix the cloth point of temperature connection line with glue. The
cloth point must be attached to the test surface to avoid effect the value precision. User
can use the channel identification sticker to distinguish different test lines.
Starting to test DUT after cloth point of each part is all fixed. Do not move DUT and the
instrument during the test, so as not to effect the accuracy.
After the test is completed, remove the test connection line and pull out USB.
Arrange the instrument and line, then turn off the power supply.

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7. <Test>
7.1 Numerical Reading
Press【Test】on the panel to enter <Test> page.
Note: If user need to record the data, please insert USB into the port of the instrument befor
data acquisition. Start the test after USB is identified.
Display mode: numerical reading, curve chart, histogram
Numerical reading is the best way to read one or more channel values at some point. Press
【Start】key, the instrument will start data acquisition. A green flashing cursor at the top of
the screen indicates that the data is being collected, test values will show with green color as
shown in Figure 7-1. Press【Stop】key to terminate data acquisition.
Figure 7-1 Temperature Numerical Reading
Check test data of other channel by page switching or up/down key
During data acquisition, user can set the following parameters based on your own needs.
Different font:【Zoom+/-】Key is used to switchthe font size. Every time you press 【Zoom+/-】
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