I-Tech IT8800 Series User manual

Programmable DC Electronic
Load
Series IT8800 User’s Manual
Model:IT8811/IT8812/IT8812B/IT8812C
Revision: V2.6
Via Acquanera, 29 22100 Como
tel. 031.526.566 (r.a.) fax 031.507.984
[e-mail] www.calpower.it

Statement
According to the international copyright
law, reproduction of any part of this
manual in any form (including electronic
storage and retrieval or translation into
languages of other countries or regions)
is not allowed without prior permission
and written consent of Itech Electronic
Co., Ltd.
Manual Article No.
IT8800-402180
Revision
Revision 2, published on
April 28, 2019
Itech Electronic, Co., Ltd.
Trademark Statement
Pentium is a registered trademark of
Intel Corporation in the United States.
Microsoft, Visual Studio, Windows and
MS Windows are trademarks of
Microsoft Corporation in the United
States and/or other countries/regions.
Guarantee
Materials in the document are provided
talis qualis and may be changed in
future revisions without prior notice. In
addition, within the maximum allowable
extent of laws, ITECH is not committed
to any explicit or implied guarantee for
this manual and all information therein,
including but not limited to the implied
guarantee on marketability and
availability for some special purposes.
ITECH shall not be responsible for any
error or incidental or indirect losses
caused by the provision, use or
application of this documents and
information therein. If some guarantee
clauses in other written agreements
between ITECH and users are not
consistent with clauses herein, those
clauses in other written agreements
shall prevail.
Technology license
Hardware and/or software in this
document cannot be provided without a
license and can only be used or copied
according to the license.
Restricted permission statement
Restricted permissions of the U.S.
government. Permissions for software
and technical data which are authorized
to the U.S. Government only include
those for custom provision to end users.
ITECH follows FAR 12.211 (technical
data), 12.212 (computer software).
DFARS 252.227-7015 (technical
data--commercial products) for national
defense and DFARS 227.7202-3
(permissions for commercial computer
software or computer software
documents) while providing the
customized business licenses of
software and technical data.
Safety Statement
“Caution” signs indicate danger. It is
required to pay attention to the contents
of these signs during implementation of
operations.
The damage to the product or loss of
important data may be caused in case of
improper operation steps or failure to
follow operation steps. Do not continue
to implement any improper operation
indicated in “Caution” signs when the
specified conditions are not fully
understood or these conditions are not
satisfied.
“Warning” indicates danger. It is
required to pay attention to the contents
of these signs during implementation of
operation steps. Personal casualties
may be caused in case of improper
operation steps or failure to follow these
operation steps. Do not continue to
implement any improper operation
indicated in “Warning” signs when the
specified conditions are not fully
understood or these conditions are not
satisfied.
NOTE
“Instructions” indicates operation
instructions. It is required to refer to the
contents of these signs during operation
steps. These signs are used for
providing tips or supplementary
information for operators.

IT8800 User’s Manual
Copyright © ITECH Electronic Co., Ltd. iii
Certification and Quality Assurance
IT8800 series electronic load completely reaches nominal technical indicators
in the manual.
Warranty service
ITECH Company will provide one-year warranty services for the product
materials and manufacturing (excluding the following limitations).
When warranty service or repair is needed, please send the product to the
service unit specified by ITECH Company.
When the product is sent to ITECH Company for warranty service, the
customer must pay the one-way freight to the maintenance department of
ITECH, and ITECH will be responsible for return freight.
If the product is sent to ITECH for warranty service from other countries,
the customer will be responsible for all the freight, duties and other taxes.
Limitation of Warranty
Warranty service does not apply to the damage caused in the following
circumstances:
Damage resulting from customer-wired circuits or customer-supplied parts
or accessories;
Product which has been modified or repaired by the customer;
Damage caused by the circuit installed by the customer or damage caused
by operation of the product in non-specified environment;
The product model or serial number is altered, deleted, removed or made
illegible by customer;
Damage caused by accidents, including but not limited to lightning, water,
fire, abuse or negligence.
Safety signs
DC power
ON (with the power
switched on)
AC power
OFF (with the power
supply switched off)
Both DC and AC power supply
Power supply
switching-on status
Protective grounding terminal Power supply
switching-off status
Grounding terminal
Reference terminal
Danger sign
Positive terminal
Warning sign (refer to specific
“Warning” or “Caution”
information in the manual)
Negative terminal
Ground wire connection end
sign
-
-

IT8800 User’s Manual
Copyright © ITECH Electronic Co., Ltd. iv
Safety Precautions
General safety precautions below must be followed in each phase of instrument
operation. In case of failure to follow these precautions or specific warnings in
other parts of the manual, violation against the safety standards related to the
design, manufacture and purpose of the instrument will occur. If the user does
not follow these precautions, ITECH will bear no responsibility arising there
from.
Working voltage of IT8800 series includes 110V/220V. To prevent burnout,
be sure to check whether the AC voltage setting of electronic load is
consistent to the supply voltage before start-up!
The electronic load is provided with a three-core power line during delivery
and should be connected to a three-core junction box. Before operation, be
sure that the electronic load is well grounded.
Use electric wires of appropriate load. All loading wires should be capable
of bearing maximum short-circuit of electronic load without overheating.
Ensure the voltage fluctuation of mains supply is less than 10% of the
working voltage range in order to reduce risks of fire and electric shock.
To prevent burnout, please pay special attention to positive and negative
polarities of electronic load during connection!
Do not use damaged equipment. Please check the housing before using
the equipment. Check whether the instrument is subject to cracking or is
lack of plastic. Do not operate the instrument in the environment with
explosive gas, steam or dust.
Observe all tags on the equipment before connection.
Do not install alternative parts on the instrument or perform any
unauthorized modification.
Do not use the equipment when the removable cover is dismantled or
loose.
Please use the power adapter supplied by the manufacturer to avoid
accidental injury.
We do not accept responsibility for any direct or indirect financial damage
or loss of profit that might occur when using the instrument.
This instrument is used for industrial purposes. Do not apply this product to
IT power supply system.
Do not use the equipment on the life support system or other equipment
with safety requirements.
If the equipment is not used in the manner specified by the manufacturer,
its protection may be damaged.
Always use dry cloth to clean the equipment housing. Do not clean the
inside of the instrument.
Do not block the air vent of the equipment.
Environmental conditions
The IT8800 series electronic load can only be used indoors or in low
condensation areas. The following table shows general environmental
requirements for this instrument.
Environmental conditions
Requirement

IT8800 User’s Manual
Copyright © ITECH Electronic Co., Ltd. v
Operating temperature
0°C
～
40°C
0°C - 40°C
Operating humidity
20% - 80% (non condensing)
Storage temperature
-20°C - 70 °C
Altitude
Operating up to 2,000 meters
Installation category
Ⅱ
Pollution degree
Pollution degree 2
NOTE
In order to ensure the accuracy of measurement, it is recommended to operate the
instrument half an hour after start-up.
Regulation tag
The CE tag shows that the product
complies with the provisions of all relevant
European laws (if the year is shown, it
indicates that the year when the design is
approved).
This instrument complies with the WEEE
directive (2002/96/EC) tag requirements.
This attached product tag shows that the
electrical/electronic product cannot be
discarded in household waste.
This symbol indicates that no danger will
happen or toxic substances will not leak or
cause damage in normal use within the
specified period. The service life of the product
is 10 years. The product can be used safely
within the environmental protection period;
otherwise, the product should be put into the
recycling system.
Waste electrical and electronic equipment (WEEE)
directive
Waste electrical and electronic equipment (WEEE)
directive, 2002/96/EC
The product complies with tag requirements of the
WEEE directive (2002/96/EC). This tag indicates that the
electronic equipment cannot be disposed of as ordinary
household waste.
Product Category
According to the equipment classification in Annex I of
the WEEE directive, this instrument belongs to the
“Monitoring” product.
If you want to return the unnecessary instrument,
please contact the nearest sales office of ITECH.

IT8800 User’s Manual
Copyright © ITECH Electronic Co., Ltd. vi
Compliance Information
Complies with the essential requirements of the following applicable European
Directives, and carries the CE marking accordingly:
Electromagnetic Compatibility (EMC) Directive 2014/30/EU
Low-Voltage Directive (Safety) 2014/35/EU
Conforms with the following product standards:
EMC Standard
IEC 61326-1:2012/ EN 61326-1:2013 ¹²³
Reference Standards
CISPR 11:2009+A1:2010/ EN 55011:2009+A1:2010 (Group 1, Class A)
IEC 61000-4-2:2008/ EN 61000-4-2:2009
IEC 61000-4-3:2006+A1:2007+A2:2010/ EN 61000-4-3:2006+A1:2008+A2:2010
IEC 61000-4-4:2004+A1:2010/ EN 61000-4-4:2004+A1:2010
IEC 61000-4-5:2005/ EN 61000-4-5:2006
IEC 61000-4-6:2008/ EN 61000-4-6:2009
IEC 61000-4-11:2004/ EN 61000-4-11:2004
1. The product is intended for use in non-residential/non-domestic environments. Use of the
product in residential/domestic environments may cause electromagnetic interference.
2. Connection of the instrument to a test object may produce radiations beyond the specified
limit.
3. Use high-performance shielded interface cable to ensure conformity with the EMC standards
listed above.
Safety Standard
IEC 61010-1:2010/ EN 61010-1:2010

IT8800 User’s Manual
Copyright © ITECH Electronic Co., Ltd. vii
Content
Certification and Quality Assurance.........................................................................................................................iii
Warranty service.......................................................................................................................................................iii
Limitation of Warranty.............................................................................................................................................iii
Safety signs ..............................................................................................................................................................iii
Safety Precautions....................................................................................................................................................iv
Environmental conditions.........................................................................................................................................iv
Regulation tag............................................................................................................................................................v
Waste electrical and electronic equipment (WEEE) directive...................................................................................v
Compliance Information...........................................................................................................................................vi
Chapter1 Acceptance and Installation............................................................................................................1
1.1 Confirm package contents...................................................................................................................................1
1.2. Installation position ............................................................................................................................................1
1.3 Adjustment of load handle...................................................................................................................................2
1.4 Disassembly of load handle.................................................................................................................................3
1.5 Installation of support..........................................................................................................................................3
1.6 Connecting the DUT............................................................................................................................................3
1.7 Connecting the Power Line .................................................................................................................................4
Chapter2 Quick Start.......................................................................................................................................6
2.1 Brief Introduction................................................................................................................................................6
2.2 Introduction of front board..................................................................................................................................7
2.3 Introduction of keyboard.....................................................................................................................................7
2.4 Fast function key .................................................................................................................................................8
2.5 Function description of VFD status indicators....................................................................................................8
2.6 Introduction of rear board....................................................................................................................................9
2.7 Power-on selftest .................................................................................................................................................9
Chapter3 Function and Features...................................................................................................................12
3.1 Switching of local/remote operation modes ......................................................................................................12
3.2 Constant-status operation mode.........................................................................................................................12
3.2.1 Constant current operation mode (CC).....................................................................................................12
3.2.2 Constant voltage operation mode (CV) .....................................................................................................14
3.2.3 Constant resistance operation mode (CR).................................................................................................15
3.2.4 Constant power operation mode (CW)......................................................................................................16
3.3 Input control function........................................................................................................................................ 17
3.4 Keyboard locking function................................................................................................................................17
3.5 Short-circuit analog function.............................................................................................................................17
3.6 System menu function.......................................................................................................................................17
3.7 Configuration menu function............................................................................................................................. 18
3.8 Triggering function............................................................................................................................................19
3.9 Dynamic test function........................................................................................................................................20
3.9.1 Continuous mode.......................................................................................................................................20
3.9.2 Pulse mode.................................................................................................................................................21
3.9.3 Toggle mode ..............................................................................................................................................22
3.10 OCP test function ............................................................................................................................................24
3.11 OPP test function.............................................................................................................................................25
3.12 Battery discharge test function ........................................................................................................................26
3.13 CR-LED test function......................................................................................................................................27
3.14 Measurement of voltage rise time....................................................................................................................27
3.15 Configuration save function ............................................................................................................................28
3.16 VON function..................................................................................................................................................28
3.17 Protective function...........................................................................................................................................29
3.17.1 Overvoltage protection (OVP).................................................................................................................29
3.17.2 Overcurrent protection (OCP).................................................................................................................30
3.17.3 Overpower protection (OPP)...................................................................................................................30
3.17.4 Overtemperature protection (OTP) .........................................................................................................30
3.18 List operation................................................................................................................................................... 31
3.19 Terminal function of rear board.......................................................................................................................33
3.19.1 Remote sense compensation functions.....................................................................................................33
3.19.2 External trigger function .........................................................................................................................34

IT8800 User’s Manual
Copyright © ITECH Electronic Co., Ltd. viii
3.19.3 External analog quantity test...................................................................................................................34
3.19.4 Voltage fault indication ...........................................................................................................................34
3.19.5 External On/Off Control..........................................................................................................................34
3.19.6 Current monitoring (I Monitor)...............................................................................................................34
3.20 External Signal Control Interface....................................................................................................................35
3.21 Auto test function............................................................................................................................................35
Chapter4 Technical Specification..................................................................................................................39
4.1 Specification......................................................................................................................................................39
4.2 Supplementary characteristic.............................................................................................................................41
Chapter5 References of Load Communication Interfaces..........................................................................42
5.1 RS232 interface.................................................................................................................................................42
5.2 USB Interface....................................................................................................................................................43
5.3 GPIB interface...................................................................................................................................................43
Appendix.....................................................................................................................................................................44
Specifications of Red and Black Test Lines............................................................................................................44

Acceptance and Installation
Copyright © ITECH Electronic Co., Ltd. 1
Chapter1 Acceptance and Installation
1.1 Confirm package contents
Open the package and check the articles within package box before operation.
In case of any non-conformity, missing or appearance wearing, please contact
ITECH immediately.
The package box should comprise:
Device name
Quantity
Model
Remarks
Electronic
load 1 IT8800 series
IT8800 series include:
IT8811/IT8812/IT8812B/
IT8812C
Power line 1
IT-E171/IT-E1
72/
IT-E173/IT-E1
74
The User may select different
power lines based on local
outlet specification. For
detailed specifications, refer to
1.7 Connecting the Power
Line.
CD 1 -
Comprising user manual and
documents related to
programming and grammatical
guidelines.
Factory
alignment
report
1
-
Test report before delivery.
USB
communicati
on line
1
-
-
NOTE
After confirming that package contents are consistent and correct, please
appropriately keep package box and related contents. The package requirements
should be met when the instrument is returned to factory for repair.
IT8800 Series load is supplied with the following optional accessories (sold
separately):
Item
Model
Remarks
Rack mount kit
IT-E151/
IT-E151A
To mount the instrument on a special rack,
user may select this optional.
1.2. Installation position
The instrument should be installed at well-ventilated and rational-sized space.
Please select appropriate space for installation based on the electronic load
size.

Acceptance and Installation
Copyright © ITECH Electronic Co., Ltd. 2
1.3 Adjustment of load handle
The load handle may be adjusted based on three methods (as shown in icons
below). Be sure that appropriate force is applied to adjust the load handle to
appropriate position.
Model: IT8811/IT8812/IT8812B/IT8812C
Detailed dimensional drawings

Acceptance and Installation
Copyright © ITECH Electronic Co., Ltd. 3
1.4 Disassembly of load handle
Please disassemble the load handle before installing equipment on the support.
Disassembly steps:
1. Adjust the handle to the position as shown in the figure below.
NOTE
To easily disassemble handle, align the locking mouth and locking device, which is
between the handle and the instrument.
2. Align the locking mouth, and pull out the handle towards two sides.
NOTE
Do not use too much force and mind your hands during disassembly of load handle.
1.5 Installation of support
IT8800 Series load can be mounted on a standard 19” rack. ITECH provides
user with IT-E151/IT-E151A rack, as an optional mount kit. The detailed
operation please refer to the User Manual of your mount kit.
1.6 Connecting the DUT
Before connecting the DUT
Test lines are not standard accessories of the instrument. Please select
optional red and black test lines for individual sales based on the maximum
current value. For specifications of test lines and maximum current values, refer
to “Specifications of Red and Black Test Lines” in “Appendix”.
Before connecting DUT, be sure to switch off the power supply of
the test loop in order to avoid electric shock.
To avoid electrical shock, before testing, please make sure the
rating values of the testing lines, and do not measure the current that
higher than the rating value.
Always use test lines provided by ITECH to connect the
equipment. If test lines from other factories are used, please check

Acceptance and Installation
Copyright © ITECH Electronic Co., Ltd. 4
that the test line can withstand maximum current.
Introduction of Binding Posts
The maximum rated current of the terminal at position (A) is the maximum rated
input current of the instrument. Securely fasten all wires by hand-tightening the
binding posts. You can also insert standard banana plugs into the front of the
connectors as shown in (B), and the maximum rated current at (B) is 10 A.
Connecting the DUT
Test line connection is given below taking local measurement as example. For
details of local and remote measurements, refer to “Terminal function of rear
board”.
1. Before connecting the test lines, be sure that the instrument Power is in Off
position.
2. Unscrew the screws of the input terminals and connect the red and black
test lines to the input terminals. Re-tighten the screws.
When maximum current that one test line can withstand fails to meet the
current rated current, use several pieces of red and black test lines. For
example, the maximum current is 1,200A, then 4 pieces of 360A red and
black lines are required.
3. Directly connect the other end of the red and black lines to the DUT
terminal.
1.7 Connecting the Power Line
Connect power line of standard accessories and ensure that the electronic load
is under normal power supply.
AC power input level
Working voltage of IT8811/IT8812/IT8812B/IT8812C includes 110V and
220V(which can be selected by the switch on rear board of load).
AC power input level:
Option Opt.1: 220Vac 50Hz/60Hz
Option Opt.2: 110Vac 50Hz/60Hz
Categories of power lines
Please select appropriate power lines appropriate to local voltage based on the
specifications of power lines below. If purchased model fails to meet local
voltage requirements, please contact distributor or factory for change.

Acceptance and Installation
Copyright © ITECH Electronic Co., Ltd. 5
China
IT-171
America, Canada,
Japan
IT-E172
Europe
IT-E173
Britain
IT-E174

Quick Start
Copyright © ITECH Electronic Co., Ltd. 6
Chapter2 Quick Start
This Chapter will introduce power-on check steps of IT8800 Series to ensure
normal start-up and usage under initialization status of the load. Besides, to
facilitate usage, this part also displays the functions of front board, rear board
and keyboard keys as well as display functions of VFD (Vacuum Fluorescent
Display) to a quick view of load appearance, structure and key usage functions
before operation.
2.1 Brief Introduction
IT8800 Series is a single-input programmable DC electronic load. Built in with
RS232, USB and GPIB communication interfaces, this series of programmable
DC electronic load provides a multi-purpose solution to meet different design
and test requirements.
This Series delivers special functions and advantages at international level,
including:
High-visibility vacuum fluorescent display (VFD)
Dynamic mode: up to 25KHz
Voltage measurement dissolution rate: up to 0.1 mV Current 0.01 mA (10
uA)
Voltage and current measurement speed: up to 50 KHz
Four operation modes: constant voltage, constant current, constant
resistance and constant power.
Rotary coding switch for easy and quick operation
Remote sense test function
Battery test function
OCP test, OPP test
Auto test function
CR-LED test
Memory capacity: 100 groups
Short-circuit function
Dynamic test function
Portable and robust enclosure equipped with skid resistant foot stand
Intelligent fan control
Built-in Buzzer, for warning
Outage backup memory
Built-in GPIB, USB and RS232 communication interfaces
Model
Voltage
Current
Power
IT8811
120V
30A
150W
IT8812
120V
30A
250W
IT8812B
500V
15A
200W
IT8812C
120V
60A
250W

Quick Start
Copyright © ITECH Electronic Co., Ltd. 7
2.2 Introduction of front board
IT8800 Series front board:
1. VFD screen
2. Adjusting knob
3. Input terminal
4. UP, DOWN, LEFT and RIGHT key, to move cursor
5. Function keys
6. Numeric keys and Esc keys
7. Compound key, the local switch key and power switch
2.3 Introduction of keyboard
Keys at IT8800 key area are shown below.
Detailed description of keys:
Shift composite key.
LOCAL key, to shift local and remote operation.
Power on key.
～
9
0 -9 are numeric keys.
Dot.
ESC
Esc key, to exit at any working status.
To select constant current mode and set current input value.
To select constant voltage mode and set voltage input value.
To select constant resistance mode and set resistance input value.
①
②
③
④
⑤
⑥
⑦

Quick Start
Copyright © ITECH Electronic Co., Ltd. 8
To select constant power mode and set constant power input value.
Enter key.
Turns the instrument input on or off.
Up key, to select menu items during menu operation.
Down key, to select menu items during menu operation.
Left/Right key, to adjust the cursor to the specified location to set the
value.
2.4 Fast function key
A combination of front board keys and Shift composition keys in IT8800 Series
can realize functions marked at key bottom. For details, see table below.
(Shift)+ (Short)
To start or end short circuit test.
(Shift)+ (Tran) To set dynamic operation parameters.
(Shift)+ (List)
To set list operation function.
(Shift)+ (Save) To save existing setting load parameter values,
e.g., voltage, current and power.
(Shift)+ (Battery)
To operate battery test function.
(Shift)+ (Prog)
To operate auto test function.
(Shift)+ (Info)
To display model, version number and serial
number of electronic load.
(Shift)+ (System)
To set system menu.
(Shift)+ (Config)
To configure system menu.
(Shift)+ (Pause)
To pause operation during automatic test.
(Shift)+ (Trigger)
Trigger key, to start up triggering functions.
(Shift)+(OCP)
To operate OCP test function.
(Shift)+(Setup)
To set specific parameters of constant voltage,
constant current, constant resistance and
constant power.
(Shift)+(OPP)
To operate OPP test function.
(Shift)+ (Recall)
To select stored load parameter values, e.g.,
voltage, current and power setting values.
(Shift)+ (Lock)
To operate Keyboard locking function.
(Shift)+（CZ）
Constant impedance mode (Incomplete
support).
2.5 Function description of VFD status indicators
OFF
The load is off
Error
The load has error
CC
The load is under constant current
mode
Trig
The load is waiting for triggering
signal
CV
The load is under constant voltage
mode
Sense
The load is under remote sense
input mode
CR
The load is under constant resistance
mode
Prot
The load is under software
overcurrent protection status

Quick Start
Copyright © ITECH Electronic Co., Ltd. 9
CW
The load is under constant power
mode
Rear
Start external analog quantity
function
Rmt
The load is under remote operation
mode
Auto Start automatic voltage range
Addr
Send command under remote
operation
* Start keyboard locking function
SRQ Serial request query Shift Shift key is pressed
LRV
LRV will be displayed on the screen
when the load input reverses
polarity.
- -
2.6 Introduction of rear board
IT8800 Series rear board:
1. Cooling window
2. RS232 communication cable interface
3. USB communication cable interface
4. GPIB communication cable interface
5. AC power input socket (including fuse)
6. AC power switch key
7. Current monitoring terminal
8. Remote sense compensation terminal, external triggering terminal and
external analog 0-10 V control terminal
9. External signal control interface
2.7 Power-on selftest
A successful selftest indicates that the purchased load product meets delivery
standards and is available for normal usage.
Before operation, please confirm that you have fully understood the safety
instructions.
To avoid burning out, be sure to confirm that power voltage
matches with supply voltage.
①
②
③
④
⑤
⑥
⑦
⑧
⑨

Quick Start
Copyright © ITECH Electronic Co., Ltd. 10
Be sure to connect the main power socket to the power outlet of
protective grounding. Do not use terminal board without protective
grounding. Before operation, be sure that the electronic load is well
grounded.
To avoid burning out, pay attention to marks of positive and
negative polarities before wiring.
Selftest steps Normal selftest procedures:
1. Correctly connect the power line. Press Power key to start up.
The VFD screen of electronic load displays software version number "BOIS
Ver 1.10".
2. After approximately 1s, the system is under selftest and the VFD display
shows “System Selftest….”
3. After selftest, the VFD display information below.
0.0000V 0.0000A
0.00W CC=0.000A
Information description:
The first line displays actual input voltage and current values.
The second line displays setting values of actual power value and
current (voltage, power and resistance).
4. Press [Shift]+ [7](Info), the electronic load VFD screen displays related
information of the product. Press key to switch display of product
model, product serial number and software version number.
Model:IT88XX
Ver:1.XX-1.XX
SN:XXXXXXXXXXXXXXXXXX
Exception handling
If the electronic load cannot start normally, please check and take measures by
reference to steps below.
1. Check whether the power line is correctly connected and confirm whether
the electronic load is powered.
Correct wiring of power line => 2
Incorrect wiring of power line => Re-connect the power line and check
whether the exception is removed.
2. Check whether the power in On. Power key is under “ ” On status.
Yes => 3
No => Please check the Power key to start power and check whether
the exception is removed.
3. Check whether set power voltage of electronic load is larger than the power
supply voltage. If set power voltage is 220 V and the supply voltage is 110
V, the electronic load cannot start.
4. Check whether the fuse of electronic fuse is burned out.
If yes, change fuse. Detailed steps:

Quick Start
Copyright © ITECH Electronic Co., Ltd. 11
1) Pull out power line and take out the fuse box at power line jack with a small
screw driver. As shown below.
2) If the fuse is fused, please change fuse of same specification based on
machine model. See the table blow for matching information of fuse and
machine model.
Product
Fuse specification(110VAC)
Fuse specification(220VAC)
IT8811
T 2.5A 250V
T1.25A 250V
IT8812
T 2.5A 250V
T1.25A 250V
IT8812B
T 2.5A 250V
T1.25A 250V
IT8812C
T 2.5A 250V
T1.25A 250V
3) After replacement, install the fuse box back to original position, as shown
below.

Function and Features
Copyright © ITECH Electronic Co., Ltd. 12
Chapter3 Function and Features
This Chapter will give a detailed description of functions and features of the
electronic load. It is divided into the following parts:
Switching of local/remote operation modes
Constant-status operation mode
Input control function
Keyboard locking function
Dynamic simulation function
System menu function
Configuration menu function
Triggering function
Dynamic test function
OCP test function
OPP test function
Battery discharge test function
CR-LED function
Measurement of voltage rise time
Save function
VON function
Protective function
List function
Terminal function of rear board
To operate auto test function
3.1 Switching of local/remote operation modes
The electronic load is provided with local and remote operation modes. These
two modes can be switched through communication commands. At initialization,
the electronic load is defaulted under local operation mode.
Local operation mode: for operating related functions through keys on the
electronic load machine.
Remote operation mode: for operating related functions of the electronic
load on PC through a connection between the electronic load and PC.
Under remote operation mode, except [Local] key, other keys on the board
are disabled. The [Local] key can be used for switching to local operation
mode.
3.2 Constant-status operation mode
The electronic mode can work under the 4 constant-state operation modes:
Constant current operation mode (CC)
Constant voltage operation mode (CV)
Constant resistance operation mode (CR)
Constant power operation mode (CW)
3.2.1 Constant current operation mode (CC)
Under CC mode, the electronic load will consume constant current in
regardless of whether the input voltage changes or not, as shown in Fig. 3-1.