Unit UTL8200+ Series User manual

User’s Manual
UTL8200+ Series DC Electronic Load

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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
UNI-T warrants that the product will be free from defects for a three-year period. If the product is re-sold,
the warranty period will be from the date of the original purchase from an authorized UNI-T distributor.
Probes, other accessories, and fuses 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. Replacement parts and products may be brand new, or perform at the same
specifications as brand new products. All replacement parts, modules, and products 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 to
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 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.
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

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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.
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 UTL8200+ DC electronic load.
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.

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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 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.

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DC
Direct current device. Please check the region’s voltage range.
Grounding
Frame and chassis grounding terminal
Grounding
Protective grounding terminal
Grounding
Measurementgrounding termina
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.
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.
Certificatio
n
CE indicates a registered trademark of EU.
Certificatio
n
UKCA indicates a registered trademark of UK.
Certificatio
n
ETL indicates a registered trademark of Intertek. It conform to UL
STD 61010-1 and 61010-2-030, CSA STD C22.2 No.61010-1 and 61010-2-
030.
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.

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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 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 scale 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

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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 the specified fuse 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, 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.

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3. Introduction of UTL8200+ Series
UTL8200+ Series DC electronic load includes two models, UTL8211+ and UTL8212+.
The measurement range is as follows.
UTL8200+ series DC electronic load is equipped with 2.8 inch LCD, which is convenient and simple to operate
and has a fashionable appearance. The electronic load has a wide range of power measurement, voltage and
current sampling rate up to 4.8MHz, test resolution up to 1mV/1mA, while equipped with rich test functions
and modes for your choice. The equipment is equipped with RS232 communication module, which is flexible
to meet various field test conditions and is convenient to connect seamlessly with automated production
lines and automatic test systems (ATS). The electronic load is stable and widely used to meet various testing
requirements.
Characteristics
Four modes CC/CV/CR/CP
Resolution is up to 1mV/1mA
Sampling rate of voltage/current is up to 4.8MHz
Multi-modes battery discharge test
List mode supports automatic test
Independent short circuit test function
Overvoltage, low voltage, overcurrent, overpower, overheat and anti-reverse connection protection
RS232 communication interface (RS485 interface optional)
Matched upper computer software for remote control and monitor
Power cutoff memory
Smart temperature controlled fans
Chinese/English display
Model
Channel Number
Measurement Range
Voltage
Current
Power
UTL8211+
Single channel
0~150V
0~40A
0~400W
UTL8212+
Dual channel
0~150V
0~20A
0~200W

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4. Product Overview
4.1 Front Panel
Figure 4-3 Front Panel
No.
Name
Description
1
Label
Model name and specification
2
Screen
Display
Display the operating state of channel with load,
measurement parameter and operation mode
3
Key
Select test mode (CC, CV, CR, CP, and etc.)
For the specified function.
4
Channel-input
port
Input load power, do not reverse connecting the
instrument to avoid the damage
5
Power Switch
Turn on/off electronic load
6
Rotary Knob
Adjusting the size of parameter or adjusting the cursor
poistion in the menu

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4.1.1 Key
Key function of UTL8200+ series is as follows.
Name
Description
Shift
Press to execute the function
Direction Key
Move the cursor or modify the numerical value of the selected parameter
Enter
Confirm/modify the current option or parameter
ESC
Turn back to the last menu
Mode
Set the operation mode of the instrument
CH
Swtich the channel (only forUTL8212+ dual channel）
ON1/ON2
Control input state of the load: ON/OFF
LOCK
Lock key (long press to unlock / short press to lock)
4.4.2 Quick Function Key
In the specified interface, key can be combined with Shift key to quickly execute the function. Press Shift
at first and then press other key.
Quick key function of UTL8200+ series is as follows.
Key Name
Description
Shift +←(Save)
Save list file
Shift + ↑(Manual)
Switch to control by the instrument when in remote
Shift + →(Short)
Turn on short circuit test
Shift + ESC (Delete)
Delete list file
Shift + Enter (Result)
Check result of list test
Shift + Mode (Menu)
Main menu: system configuration, parameter setting, file operation
and device information
Shift + ↓(Trigger)
Manual trigger

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4.2 Rear Panel
Figure 4-4 Rear Panel
No.
Name
Description
1
Air Outlet
For cooling
2
Power Socket AC 220/110V
AC power socket
3
Fuse
4
Power Switch AC 220/110V
Switch of AC voltage
5
RS232
External communication interface for remote
control the electronic load
5. Inspection and Installment
5.1 Packing List
Please inspect the instrument before using
1．Check whether the appearance is damaged, scratched or has other defects;
2．Check with packing list to confirm that accessories has no loss.

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If there have any problem, please contact with Uni-Trend Instrument Sale Department or the
distributor.
Components
Quantity
Remarks
DC Electronic Load
1
UTL8211+
UTL8212+
The model is subject to the actual
order
Power Cord
1
RS232 Communication
Line
1
No communication line for RS485
interface
Spare Fuse
2
Fuse with different
specifications according to
different orders 250V/0.5A only
for input voltage 110V
250V/0.25A only for input voltage
220V
User’s Manual
1
Electronic file，it can download
from the official website
5.2 Power Requirements
UTL8200+ series can only use under the power supply terms as follows.
Parameter
Requirements
Voltage
AC 220/110(±10%)V
Frequency
50/60HZ
Power Consumption
50W
Fuse
AC 220V input voltage: 250V/0.25A
AC 110V input voltage: 250V/0.5A
Factory supply three-core power cable, please make sure power cable of three phase socket is
connect with ground before use.
The instrument with power conversion switch, please check and make sure that the conversion switch
is move to the right scale before connecting the power supply.
This instrument 220V is select fuse of 250V/0.25A, the specification is 5×20mm. It all set and equip
with spare fuse of 250V/0.25A or 250V/5A in fuse box before the product leave the factory.
Please remove the external power cable before replace the fuse, open the fuse socket slot under the
power supply plug, take out the old fuse and replace the new fuse into it, after that the instrument can
be used normally.
Warning:Do not use power cable with any signs of damage to avoid danger!
If use 110V AC input, please change fuse of 250V/0.5A.

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5.3 Operating Environment
The operating environment requirements of UTL8200+ series is as follows.
Ventilation fans speed rate will change with the temperature of cooling fin when the electronic load is
loading.
Operating Environment
Environmental Requirements
Humidity
20%~80% (non- condensation)
Temperature
0℃~40℃
Storage Temperature
-10℃~60℃
Altitude
≤2000 meters
Pollution Degree
2
5.4 Cleaning
To prevent from the risk of electric shock, please pull out power cord befor cleaning.
Please use a clean and damp cloth to clean the cover and panel.
Do not clean the inside of the instrument.
Caution：Do not use solvents (alcohol or gasoline) to clean the instrument.
6. Measurement
6.1 Power Up
The correct self-inspection of electronic load is as follows.
1. Connecte the power cord corretly and make sure the 110V/220V power switch is selected correctly.
Press the power switch to power up the electronic load. The screen will show the progress bar of the
current state.
2. After the initialization, the screen displays the current measurement state. If the boot-up mode is set,
the instrument will enter the preset measurement mode.
When the self-inspection is finished, it means that the instrument is meets the factory standard. User
can use the product normally.
Warning: Please make sure the power voltage is matched with the utility power. Otherwise, the
instrument will be damaged.
Power plug should connect with the protective grounding power socket. Do not use a wiring board
without protective grounding.

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6.2 Measurement Interface
6.2.1 Screen Display
LCD will divided into several areas to display information when enter the measurement mode. Take CC
mode of UTL8212+ dual channel as an example as shown in the following figure.
6.2.2 Measurement Interface
No.
Name
Description
1
State and mode information
Display the current state of on-load channel, remote
control, short circuit test and trigger function
2
Setting area
Display the information of mode and the operating time
information
3
Operating data
Display the real-time voltage, current and power
4
Current mode
Display the mode
5
Yellow wire frame
Display the currently selected channel (only for UTL8212+
dual channel)

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6.2.3 State Information
Mode
State
Description
Mode
CC/CV/CP/CR
Display the current measurement state or operation
mode
Control mode
COMM
The load is in remote mode (if it not display, the load
is in local mode.)
Lock key
Lock
The key is locked, so the operation is invalid
Trigger mode
[Manual]/[Ext Trig]
Trigger mode is manua/external mode
Waiting for trigger
[Trigger]
The current mode is waiting for trigger, the mark will
disappear when it generated
Short circuit
[Short]
The load is in short circuit state
6.2.4 Operation Indicator
UTL8200+ series has operation indicator. When the electronic load is operating, ON key will illuminated
with red. Press ON key again to turn off the electronic load and the indicator will be extinguished.
Caution: Yellow wireframe represents the cursor position, which is the currently selected mode.

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7. Measurement Setting
7.1 Mode Setting and Measurement
UTL8200+ series have 7 common test modes, which is CC, CV, CR, CP, dynamic, list and battery.
Press Mode key to enter mode interface, use direction key or rotaty knob to select the mode and then
press Enter key to enter the selected mode interface.
Mode Introduction
Name
Function
CC Mode
No matter how the input voltage changes, the electronic load always
consumes the constant current.
CV Mode
The electronic load maintains the input voltage as the set value by
changing the current consumption.
CR Mode
The electronic load is equals to a resistance, linear change the current
with the changing of input voltage to maintain a constant resistance
load.
CP Mode
The electronic load consumes a fixed power and the current decreases
as the voltage increases to maintain a constant power.
Dynamic Test
Set two different current values, the electronic load can step through the
two values.
List Test
It can only set up to 16 stepes with different load modes, the customizable
step mode and the upper and lower limit of test judgement, list test file
with save function.
Battery Test
CC/CR/CP can discharge the battery under test, it will automatically stop
when it meets cut-off condition and display the battery capacity.
7.1.1 CC Test (Constant Current Test)
In CC mode, no matter how the input voltage changes, the electronic load always consumes the constant
current.
Select CC mode in mode interface, press Enter key to enter CC mode and input current value;
Press ON key, the electronic load will in load state and the indicator will be illuminated;
Press ON key again to stop the load and the indicator will be extinguished.
V
I
CC
0
Figure 7-1-1 Relation Schema of Voltage-Current in CC Mode

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Operation steps
1. After the instrument is boot-up, press CH key to select the channel, yellow wireframe area is the
selected channel and it will display the prompt of CH1 or CH2 at top of the screen (UTL8211+ single
channel don’t need to choose.)
2. Press Mode key to enter the selection interface, use rotary knob or direction key to select CC mode
and then press Enter key to enter test interface.
3. Rotate the rotary knob to change the current value (constant current value).
4. Press ON key to operating, press ON key again to stop the operation.
7.1.2 CV Voltage Test (Constant Voltage Test)
In CV mode, the electronic load maintains the input voltage as the set value by changing the current
consumption.
Select CV mode in mode interface, press Enter key to enter CV mode and input voltage value;
Press ON key, the electronic load will in load state and the indicator will be illuminated;
Press ON key again to stop the load and the indicator will be extinguished.
V
I
CV
0
Figure 7-1-2 Relation Schema of Voltage-Current in CV Mode
Operation steps
1. After the instrument is boot-up, press CH key to select the channel, yellow wireframe area is the
selected channel and it will display the prompt of CH1 or CH2 at top of the screen (UTL8211+ single
channel don’t need to choose.)
2. Press Mode key to enter the selection interface, use rotary knob or direction key to select CV mode
and then press Enter key to enter test interface.
3. Rotate the rotary knob to change the voltage value (constant voltage value).
4. Press ON key to operating, press ON key again to stop the operation.
7.1.3 CR Test (Constant Resistance Test)
In CR mode, the electronic load is equals to a resistance, linear change the current with the changing of
input voltage to maintain a constant resistance load.
Select CR mode in mode interface, press Enter key to enter CR mode and input resistance value;
Press ON key, the electronic load will load state and the indicator will be illuminated;
Press ON key again to stop the load and the indicator will be extinguished.

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V
I
CR
0
Figure 7-1-3 Relation Schema of Voltage-Current in CR Mode
Operation steps
1. After the instrument is boot-up, press CH key to select the channel, yellow wireframe area is the
selected channel and it will display the prompt of CH1 or CH2 at top of the screen (UTL8211+ single
channel don’t need to choose.)
2. Press Mode key to enter the selection interface, use rotary knob or direction key to select CR mode
and then press Enter key to enter test interface.
3. Rotate the rotary knob to change the resistance value (constant resistance value).
4. Press ON key to operating, press ON key again to stop the operation.
7.1.4 CP Test (Constant Power Test)
In CP mode, the electronic load consumes a fixed power and the instrument will adjust the current with
the changing of voltage to maintain a constant power.
Select CP mode in mode interface, press Enter key to enter CP mode and input power value;
Press ON key, the electronic load will in load state and the indicator will be illuminated;
Press ON key again to stop the load and the indicator will be extinguished.
V
I
CP
0
Figure 7-1-4 Relation Schema of Voltage-Current in CP Mode
In order to meet the various test needs, UTL8200+ series electronic load provides multiple test modes for
user, which includes dynamic test, list test and batter test.
Operation steps
1. After the instrument is boot-up, press CH key to select the channel, yellow wireframe area is the
selected channel and it will display the prompt of CH1 or CH2 at top of the screen (UTL8211+ single
channel don’t need to choose.)
2. Press Mode key to enter the selection interface, use rotary knob or direction key to select CP mode
and then press Enter key to enter test interface.
3. Rotate the rotary knob to change the power value (constant power value).
4. Press ON key to operating, press ON key again to stop the operation.

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7.1.5 Dynamic Test
UTL8200+ series electronic load has dynamic current load mode. In dynamic mode, user can set
the two constant parameter, the electronic load can switch the two constant value by set the
operation mode. The following table is an example of the set interface in this mode.
[Dynamic] [Manual]
Operation mode
Continuous
Repeat Times
01000
Low value
1.000
A
Timing of low scale
100.0
ms
High value
5.000
A
Timing of high scale
100.0
ms
Rising Slop
0.100
A/us
Falling Slop
0.100
A/us
Parameter of Dynamic Test
Dynamic Test
Description
Operation mode
Set operation mode:continuous, pulse, reversal
Low value
Set the parameter value of low scale
Timing of low scale
Set the load time of low scale
High value
Set the parameter value of high scale
Timing of high scale
Set the load time of high scale
Rising Slop
Set the rising slop
Falling Slop
Set the falling slop
Repeat Times
Set the repeat times
Operation Description of Dynamic Mode
1. Continuous Mode
The electronic load will automatically switch the two setting high/low scale until it reaches to the
repeat times and the test is over. Continous transient operation as shown in the following figure.
Figure 7-1-5-1 1 Continous Transient Operation
2. Pulse Mode
The electronic load will running with the low value, and then the electronic load switches to the high
value when it receives a trigger signal for each time. After maintaining the set time, the electronic
load switches to the low value. The electronic load will only reverse one time when it receives a

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trigger signal for each time and don’t need to set the timing of low value. Pulsed transient operation
as shown in the following figure.
Figure 7-1-5-2 Pulsed Transient Operation
3. Reversal Mode
The electronic load will switch between the high and low values once for each trigger. At this time,
there is no need to set the timing for both high and low. And it will only switch to the other state
after each trigger is performed. Toggled transient operation as shown in the following figure.
Figure 7-1-5-3 Toggled Transient Operation
Operation steps
1. After the instrument is boot-up, press CH key to select the channel, yellow wireframe area is the
selected channel and it will display the prompt of CH1 or CH2 at top of the screen (UTL8211+
single channel don’t need to choose.)
2. Press Mode key to enter the selection interface, use rotary knob or direction key to select
dynamic mode and then press Enter key to enter test interface.
3. Rotate the rotary knob to select the parameter to adjust, press Enter key to change and press it
again to save the setting.
4. After the parameter is set, press ON key to enter dynamic test interface (press ON1 to enter CH1,
press ON2 to enter CH2).
5. Press ON key to operating, press ON key again to stop the operation.