I-tech It8912e User manual

Programmable DC Electronic

Load

IT8912E User’s Manual

Model: IT8912E

Version: V2.0

IT8912E User’s Manual

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.

IT8912E-402167

Revision

Revision 2, published on

July 2, 2021

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.

IT8912E User’s Manual

Certification and Quality Assurance

IT8912E 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

IT8900 User’s Manual

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.

⚫To prevent burnout, be sure to check whether the AC voltage setting of

electronic load is consistent to the supply voltage before start-up!

⚫Do not use the instrument if it is damaged. Before operation, check the

casing to see whether it cracks. Do not operate the instrument in the

presence of inflammable gasses, vapors or dusts.

⚫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.

⚫Make sure to use the power cord supplied by ITECH.

⚫Observe all tags on the equipment before connection.

⚫Use electric wires of appropriate load. All loading wires should be capable

of bearing maximum short-circuit current of electronic load without

overheating. If there are multiple electronic loads, each pair of the power

cord must be capable of bearing the full-loaded rated short-circuit output

current

⚫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.

⚫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 instrument can only be used indoors or in low condensation areas. The

following table shows general environmental requirements for this instrument.

Environmental conditions

Requirement

IT8900 User’s Manual

Operating temperature

0°C to 40°C

Operating humidity

20% to 80% (non condensing)

Storage temperature

-20°C to 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.

IT8900 User’s Manual

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

 IT8900 User’s Manual 
 Copyright ©ITECH Electronic Co., Ltd. v
Content
Certification and Quality Assurance ............................................................................................................................ i 
Warranty service .........................................................................................................................................................i 
Limitation of Warranty ................................................................................................................................................i 
Safety signs..................................................................................................................................................................i 
Safety Precautions...................................................................................................................................................... ii 
Environmental conditions .......................................................................................................................................... ii 
Regulation tag ........................................................................................................................................................... iii 
Waste electrical and electronic equipment (WEEE) directive ................................................................................... iii 
Compliance Information............................................................................................................................................ iv 
Chapter1 Acceptance and Installation............................................................................................................ 1 
1 Confirm package contents....................................................................................................................................1 
2 Instrument Size Introduction................................................................................................................................1 
3 Adjustment of load handle...................................................................................................................................2 
4 Disassembly of load handle..................................................................................................................................3 
5 Rackmount Installation.........................................................................................................................................3 
6 Installation of power line......................................................................................................................................3 
7 Connecting Test Lines (Optional)..........................................................................................................................4 
Chapter2 Quick Start...................................................................................................................................... 5 
1 Brief Introduction .................................................................................................................................................5 
2 Front panel Introduction ......................................................................................................................................7 
3 Introduction of keyboard......................................................................................................................................7 
4 Fast function key..................................................................................................................................................8 
5 Function description of VFD status indicators......................................................................................................9 
6 Rear panel Introduction .......................................................................................................................................9 
7 Power-on selftest..................................................................................................................................................9 
Chapter3 Function and Features .................................................................................................................. 12 
1 Switching of local/remote operation modes ......................................................................................................12 
2 Constant-status operation mode........................................................................................................................12 
2.1 Constant current operation mode (CC)................................................................................................ 12 
2.2 Constant voltage operation mode (CV)................................................................................................ 14 
2.3 Constant resistance operation mode (CR) .......................................................................................... 15 
2.4 Constant power operation mode (CW)................................................................................................. 15 
3 Input control function ........................................................................................................................................16 
4 Keyboard locking function..................................................................................................................................16 
5 Short-circuit analog function..............................................................................................................................17 
6 Configuration save function ...............................................................................................................................17 
7 System menu function (System).........................................................................................................................18 
8 Configuration menu function (Config)................................................................................................................18 
9 Trigger function..................................................................................................................................................19 
10 List operation....................................................................................................................................................20 
11 Dynamic test function ......................................................................................................................................22 
11.1 Continuous mode................................................................................................................................... 22 
11.2 Pulse mode............................................................................................................................................. 24 
11.3 Toggle mode...........................................................................................................................................25 
12 OCP test function .............................................................................................................................................26 
13 OPP test function..............................................................................................................................................27 
14 Battery discharge test function ........................................................................................................................28 
15 CR-LED test function.........................................................................................................................................29 
16 Measurement rise time For voltage .................................................................................................................31 
17 VON function....................................................................................................................................................31 
18 Protective function ...........................................................................................................................................33 
18.1 Overvoltage protection (OVP) ............................................................................................................. 33 
18.2 Overcurrent protection (OCP).............................................................................................................. 33 
18.3 Overpower protection (OPP) ............................................................................................................... 34 

 IT8900 User’s Manual 
 Copyright ©ITECH Electronic Co., Ltd. vi 
3.18.4 Overtemperature protection (OTP)..................................................................................................... 34 
3.19 Functions of the terminals at the rear panel....................................................................................................34 
3.19.1 Remote sense compensation functions............................................................................................. 34 
3.19.2 External trigger function........................................................................................................................ 35 
3.19.3 External analog quantity test ............................................................................................................... 35 
3.19.4 Voltage fault indication.......................................................................................................................... 35 
3.19.5 Current monitoring (I Monitor) .............................................................................................................36 
3.20 Auto test function.............................................................................................................................................36 
Chapter4 Technical Specification.................................................................................................................. 39 
4.1 Specification .......................................................................................................................................................39 
4.2 Supplementary parameters................................................................................................................................40 
Chapter5 References of Load Communication Interfaces ............................................................................. 42 
5.1 RS232 interface...................................................................................................................................................42 
5.2 USB Interface......................................................................................................................................................43 
5.3 GPIB interface (Only for IT8912E(G))..................................................................................................................44 
Appendix............................................................................................................................................................. 45 
Specifications of Red and Black Test Lines................................................................................................................45 
 

Acceptance and Installation

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

IT8912E

Power line

IT-E171/IT-E

172/IT-E173/I

T-E174

The User may select different

power lines based on local

outlet specification. For

detailed specifications, refer

to 1.7Installation of Power

Line.

USB

communication

line

Factory

alignment report

Test report before delivery.

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.

IT8912E electrical load has optional fittings for individual sales. Detailed

descriptions of each fitting are as shown below:

Device name

Model

Fitting description

Installation fitting for

mounting instrument

to rack

IT-E151/

IT-E151A

When the user is to install the instrument

to a special rack, use this fitting.

1.2 Instrument Size Introduction

The instrument should be installed at well-ventilated and rational-sized space.

Please select appropriate space for installation based on the electronic load

size.

The detailed size of the electronic load is shown as below.

Acceptance and Installation

1.3 Adjustment of load handle

IT8912E load is equipped with a handle for user to easily carry and place it.

The load handle can be adjusted based on the three methods shown below.

When adjusting the handle, gently pull the handle towards two sides and then

rotate the handle. Each position has corresponding locker for fixing.

Detailed dimensional drawings

Acceptance and Installation

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 Rackmount Installation

This instrument can be installed on standard 19-inch 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 Installation of power line

Connect power line of standard accessories and ensure that the electronic load

is under normal power supply.

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

China

IT-171

America, Canada,

Japan

IT-E172

Europe

IT-E173

Britain

IT-E174

1.7 Connecting Test Lines (Optional)

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 test lines, 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 that the test line

can withstand maximum current.

Test line connection is given below taking local measurement as example.

For details of local and remote measurements, refer to “Functions of Rear

Panel Terminal”.

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.

Quick Start

Chapter2 Quick Start

This chapter will introduce power-on check steps of IT8912E 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

IT8912E is a single-input programmable DC electronic load. Built in with RS232

and USB 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)

⚫CC dynamic mode: up to 20KHz

⚫Voltage measurement dissolution rate: up to 10 mV Current 0.01 mA (10

uA)

⚫Voltage and current measurement speed: up to 50 KHz

⚫CC、CV+CC、CR、CW and CR-LED operating modes

⚫Unique CR-LED mode for PWM-LED driver test

⚫Ipp/Imax Measure function for LED driver pulsating current and inrush

current test.

⚫Easy programmable parameter setting, applicable for simulating LED lights

with different characteristics

⚫Adjustable frequency, duty cycle, PWM dimming output

⚫Pressure drop at compensation line in remote measure

⚫OCP test, OPP test

⚫Battery test function、Auto test function、Short-circuit function、Dynamic test

function

⚫Memory capacity: 100 groups

⚫Portable and robust enclosure equipped with skid resistant foot stand

⚫Intelligent fan control

⚫Rotary coding switch for easy and quick operation

⚫Built-in Buzzer, for warning

⚫Outage backup memory

⚫Built-in USB and RS232 interface with VISA/USBTMC/SCPI protocol

support

Model

Voltage

Current

Power

IT8912E(G)

500V

15A

300W

Quick Start

NOTE

IT8912E(G) is the model with built-in GPIB, the function is the same as standard model,

please check with ITECH for availability.

Quick Start

2.2 Front panel Introduction

①VFD display

②Rotray knob

③Shift composite key and Local key,Power switch

④Numeric key:set parameter,achieve the menu’s function by key

combination

⑤Function key:set the operation mode;Control the input state:on/off

⑥direction key:to toggle the menu items,move the cursor location

⑦input terminal

2.3 Introduction of keyboard

Keys at IT8912E key area are shown below.

Detailed description of keys:

keys

Name and functions

(Shift)

This key is used to enter other menus and functions.

(Local)

Press this key to switch the electronic load to local mode when in

remote sense mode.

(Power)

Power on or shut down the electronic load.

～

0-9 are numeric keys.In combination with Shift compound key,

Quick Start

keys

Name and functions

enable marking at bottom of each key.

Dot.

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 CR-LED function.

To select constant power mode and set constant power input value.

Confirm current setting or operations.

To control input status of load: on/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.

2.4Fast function key

A combination of front board keys and Shift composition keys in IT8912E can

realize functions marked at key bottom. For details, see table below.

keys

Name and functions

+ (Short)

To start or end short circuit test.

+ (Tran)

To set dynamic operation parameters.

+ (List)

To set list operation function.

+ (Save)

To save existing setting load parameter values, e.g.,

voltage, current and power.

+ (Battery)

To operate battery test function.

+ (Prog)

To operate auto test function.

+ (Info)

To display model, version number and serial

number of electronic load.

+ (System)

To set system menu.

+ (Config)

To configure system menu.

+ (Pause)

To pause operation during automatic test.

+ (Trigger)

Trigger key, to start up triggering functions.

+ (OCP)

To operate OCP test function.

+ (Setup)

To set specific parameters of constant voltage,

constant current, constant resistance and constant

power.

+ (OPP)

To operate OPP test function.

+ (CR)

To select constant resistance mode and set

resistance input value.

+ (Recall)

To select stored load parameter values, e.g.,

voltage, current and power setting values.

ESC

Quick Start

+ (Lock)

To operate Keyboard locking function.

2.5 Function description of VFD status indicators

OFF

The load is off

Error

The load has error

The load is under

constant current mode

Trig

The load is waiting for

triggering signal

The load is under

constant voltage mode

Sense

The load is under remote

sense input mode

The load is under

constant resistance

mode

Prot

The load is under software

overcurrent protection

status

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

2.6 Rear panel Introduction

①Heat radiating window

②RS232 communication interface

③USB communication interface

④GPIB communication interface(Only for IT8912E(G))

⑤Remote sense,external trigger,external analog control terminal

(0-10V),PWM output terminal

⑥External signal control terminal

⑦I-monitor terminal

⑧AC power input socket

2.7 Power-on selftest

A successful selftest indicates that the purchased load product meets delivery

standards and is available for normal usage.

Quick Start

Before operation, please confirm that you have fully understood the safety

instructions.

⚫IT8912E electronic load supports 110V or 220V AC input methods. Before

powering on, be sure to check that theAC input switch status matches with

the supply voltage. Otherwise, it may damage the electronic load.

⚫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 0.000A

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.

IT89XX Ver--1.XX-1.XX

SN1:XXXXXXXXXXXXX

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.

Quick Start

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:

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(220VAC)

Fuse specification(110VAC)

IT8912E

2.5AT

1.25AT

3）After replacement, install the fuse box back to original position, as shown

below.

Function and Features

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

⚫Short circuit operation function

⚫Save/Recall function

⚫System setting function

⚫Triggering function

⚫List function

⚫Test function

⚫CR-LED function

⚫Measurement of voltage rise time

⚫VON function

⚫Protective function

⚫Remote compensation function

⚫Current monitoring 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.

Table of contents

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