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USER’S GUIDE

Programmable DC Electronic Load

Models IT 8500 series

IT8511/IT8512 /IT8512B/IT8512C

© Copyright 2004 All Rights Reserved

Ver1.1/APR, 2006/ IT8500-401

1

Quick Reference..............................................................................................................................6

T

HE

F

RONT

P

ANEL

..........................................................................................................................6

T

HE

R

EAR

P

ANEL

............................................................................................................................7

F

RONT

P

ANEL

A

NNUNCIATORS

........................................................................................................7

K

EY

P

AD

........................................................................................................................................8

I

MMEDIATE

A

CTION

K

EYS

.................................................................................................................8

M

ENU

O

PERATION

...........................................................................................................................9

General Information ......................................................................................................................11

D

OCUMENT

O

RIENTATION

..............................................................................................................11

G

ETTING

S

TARTED

M

AP

................................................................................................................11

O

PTIONS AND

A

CCESSORIES

.........................................................................................................11

Options

..................................................................................................................................11

Accessories.............................................................................................................................12

D

ESCRIPTION

................................................................................................................................12

F

EATURES AND

C

APABILITIES

........................................................................................................12

F

RONT

P

ANEL

C

ONTROLS

.............................................................................................................12

R

EMOTE

P

ROGRAMMING

...............................................................................................................12

O

PERATING

M

ODES

......................................................................................................................12

Constant Current

CC

Mode

.............................................................................................13

Constant Resistance (CR) Mode

..........................................................................................13

Constant Voltage (CV) Mode

................................................................................................13

Constant Power (CW) Mode

.................................................................................................14

T

RANSIENT

O

PERATION

.................................................................................................................14

Continuous..............................................................................................................................14

Pulse .......................................................................................................................................14

Trigger Mode...........................................................................................................................15

L

IST

O

PERATION

...........................................................................................................................15

T

RIGGERED

O

PERATION

................................................................................................................16

I

NPUT

C

ONTROL

............................................................................................................................16

Short On/Off............................................................................................................................16

Input On/Off ............................................................................................................................16

Operation Range.....................................................................................................................17

P

ROTECTION

F

EATURES

................................................................................................................17

R

EMOTE

S

ENSE

F

UNCTION

............................................................................................................18

S

AVING AND

R

ECALLING

S

ETTINGS

................................................................................................19

B

ATTERY

T

ESTING

........................................................................................................................19

V

ON

/V

OFF

O

PERATION

..................................................................................................................21

Installation .....................................................................................................................................21

I

NSPECTION

..................................................................................................................................21

Damage ..................................................................................................................................21

Items Supplied ........................................................................................................................21

Cleaning..................................................................................................................................22

L

OCATION

.....................................................................................................................................22

Installation...............................................................................................................................22

2

B

ENCH

O

PERATION

.......................................................................................................................23

R

ACK

M

OUNTING

..........................................................................................................................23

I

NPUT

C

ONNECTIONS

....................................................................................................................24

Power Cord .............................................................................................................................24

Turn-On Checkout.........................................................................................................................25

I

NTRODUCTION

..............................................................................................................................25

C

HECKOUT

P

ROCEDURE

...............................................................................................................25

In Case of Trouble ..................................................................................................................26

Front Panel Operation...................................................................................................................27

E

XAMPLE

......................................................................................................................................27

I-set (set up a constant current from 0 to Max current ) ..........................................................27

P-set (set up a constant power from 0 to Max power).............................................................28

R-set (set up a constant resistance from 0.1Ω to 4000Ω) .......................................................28

V-set (set up a constant voltage from 0.1V to Max voltage)

..............................................28

Shift + Store ............................................................................................................................28

Shift + Recall...........................................................................................................................28

In On/Off input setting .............................................................................................................29

Transition Parameter Setting ..................................................................................................29

Continuous Transient Operation .............................................................................................29

Pulse Transient Operation ......................................................................................................30

Toggled Transient Operation ..................................................................................................30

List Operation..........................................................................................................................31

F

AST

R

ECALL

F

UNCTION

...............................................................................................................32

A

UTOMATIC

T

ESTING

F

UNCTION OF

E

LECTRONIC

L

OAD

...................................................................32

Edit the Testing File ................................................................................................................32

Fast Recall the Test File

.......................................................................................................33

Automatic Testing ...................................................................................................................34

Select the Resolution between Low Range and High Range

............................................34

Specifications................................................................................................................................35

Remote Operation Mode...............................................................................................................36

1 C

OMMUNICATION CABLE

.............................................................................................................36

2 C

OMMUNICATION BETWEEN ELECTRONIC LOAD AND

PC...............................................................37

3

Warranty Information

Certification

We certify that this product met its published specifications at time of shipment from the factory.

Warranty

This hardware product is warranted against defects in material and workmanship for a period of

ONE year from date of delivery. IT8500 series electronic load for use with a hardware product and when properly installed on that hardware product, are warranted not to fail to execute their programming instructions due to defects in material and workmanship for a period of 90 days from date of delivery. During the warranty period our company will either repair or replace products which prove to be defective. Our company does not warranty that the operation for the software firmware or hardware shall be uninterrupted or error free.

For warranty service, with the exception of warranty options, this product must be returned to a service facility designated by our company. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for products returned to our place for warranty service. Our company shall pay for return of products to Customer.

Limitation of Warranty

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer, Customer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation and maintenance.

Assistance

The above statements apply only to the standard product warranty. Warranty options product maintenance agreements and customer assistance agreements are also available.

Safety Summary

The following general safety precautions must be observed during all phases of operation of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument .We assumes no liability for the customer’s failure to comply with these requirements.

Environmental Conditions

This instrument is intended for indoor use. Pollution degree 2 environments. It is designed to operate at a maximum relative humidity of 95% and at altitudes of up to 2000 meters. Refer to the specifications tables for the ac mains voltage requirements and ambient operating temperature range.

Before Applying Power

Verify that all safety precautions are taken. Note the instrument's external markings described under

"Safety Symbols".

4

Ground the Instrument

This product is a Safety Class 1 instrument (provided with a protective earth terminal). To minimize shock hazard, the instrument chassis and cover must be connected to an electrical ground. The instrument must be connected to the ac power mains through a grounded power cable, with the ground wire firmly connected to an electrical ground (safety ground) at the power outlet. Note: Any interruption of the protective (grounding) conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE

Do not operate the instrument in the presence of fumes or flammable gases.

KEEP AWAY FROM LIVE CIRCUITS

Operating personnel must not remove instrument covers except as instructed in this Guide for installing or removing electronic load modules. Component replacement and internal adjustments must be made only by qualified service personnel. Do not replace components with power cable connected. Under certain conditions dangerous voltages may exist even with the power cable removed. To avoid injuries always disconnect power, discharge circuits, and remove external voltage sources before touching components.

DO NOT SERVICE OR ADJUST ALONE

Do not try to do some internal service or adjustment unless another person capable of rendering first aid resuscitation is present.

Safety Symbols

Direct current

Alternating current

Both direct and alternating current

Protective earth (ground) terminal

Caution (refer to accompanying documents)

WARNING

The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which, if not correctly performed or adhered to, could result in personal injury. Do not proceed beyond a

WARNING sign until the indicated conditions are fully understood and met.

5

CAUTION

The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like, which, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the product. Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met.

Quick Reference

The Front Panel

1 2

1

2

3

4

6 5 4 3

16-character display shows voltage and current measurements.

Rotary knob

Input terminals

Keypad:

Enable/disable input.

Setup the current, resistance and voltage modes.

Set and reset protection functions.

Scroll through front panel.

5

Entry keys:numeric keys

6

Enter values.

Increasing or decreasing the setup values.

Menu commands.

Power switch ON/OFF

6

The Rear Panel

3 4

1 2

1

2

3

4

4 Pin Trigger and Remote sensing connectors.

9-Pin COM port interface connector.

Power switch (110V / 220V)

3 Pin IEC320 ac input connector. (Power code requires ground conductor).

Front Panel Annunciators

OFF input off

CC

CV

Constant voltage (CV) mode.

CW Constant power (CW) mode.

CR

Tran

Constant current (CC) mode.

Resistance (CR) mode.

The input channel is enabled for transient operation.

Trigger

Rmt

Shift

Indicates that the electronic load is waiting an initiate and trigger to occur.

Sense

Indicates that the electronic load is in

Remote sensing state

Error A errors have occurred

Link In the communication state

Indicates that the electronic load is in remote state (RS-232). In the remote state, only the active key is the Local key.

Indicates that the shift key has been pressed.

List List mode is initiated or running.

Lock keyboard is locked by password

Unreg The input is unregulated.

7

Key Pad

POWER

0

9

ESC

P-set

R-set

Shift

On/Off

1 2 3 ESC

A B

Tran

4

5 6 0

Store Recall S-Tran Menu

I-set

P-set

V-set

R-set ENTER

7 8 9

Local Battery Short Trigger

Shift

Input on/off

0 through 9 are used for entering numeric values.

Decimal point.

The escape key. It may used to exit any working state.

Choosing CC mode and setup the input current of regulation current mode.

Choosing CV mode and setup the input voltage of regulation voltage mode.

Choosing CW mode and setup the input watt of regulation power mode.

Choosing CR mode and setup the input resistor of regulation resistance mode.

Scrolling keys let you move through the commands in the presently

Select function menu, bring up the next command in the list. Function menus are circular; you can return to the starting position by continuous pressing the key.

Go back to the previous command in the list .Function menus are circular; you can return to the starting position by continuous pressing the key.

Enter

Immediate Action Keys

Shift

Shift

Shift

Shift

Shift

Shift

Shift

Shift

Shift

Shift

Shift

+

A

Switch to A setting value

+

B

Switch to B setting value

+

Tran

Start /Stop transition operation

+

Store

Press to store an existing electronic load state in non-volatile Memory.

+

Recall

Press to recall an existing electronic load state in non-volatile Memory.

+

S-Tran

Set the transition operation parameter

+

Menu

Enter operation Menu.

+

Local

When the load is controlled by PC, press these keys to enable the front panel key

+

Battery

Battery discharge electronic operation

+

Short

Turn on or turn off short circuit Test.

+

Trigger

Causes a trigger to occur. Change the trigger source is IMMEDIATE

8

Menu Operation

Press Menu to indicate operation mode .View the menu in VFD and using and to scroll through the completely menu list as following. If press

Enter key, you could get the selected menu function. Press

Esc back to the previous menu selection page.

MENU

CONFIG

INITIAL CONFIG

Return to the factory default setup value.

POWER-ON RECALL Setting Power-on state of Load.

ON

When users turn on the electronic load; the electronic load setup value will keep the state of last time when users turn off the electronic load.

OFF<DEFAULT>

Disable this function.

INPUT RECALL

ON

Setup the electronic load input state as it is turned on

When users turn on the electronic load; the electronic load input will keep the state of last time when users turn off the electronic load.

OFF<DEFAULT>

When users turn on the electronic load, the electronic load input state will keep the off.

KEY SOUND SET

Keypad sound setting.

ON<DEFAULT>

Enable key sound.

OFF

Disable key sound.

KNOB LOCK SET

Setup rotary knob lock state.

ON

Lock Rotary knob.

OFF<DEFAULT>

Unlock Rotary knob.

SHORT CUT RECALL Fast recall the data stored before

ON

OFF

RANG SELECT

ON

Change the measure precision of voltage and current

OFF

REMOTE SENSE

Setup voltage measurement Mode.

ON

The electronic load will measure input voltage from the remote sense connector.

OFF<DEFAULT>

The electronic load will measure input voltage from the front panel connector.

ADC UPDATE RATE

HIGH

LOW<DEFAULT>

TRIGGER SOURCE Choosing the trigger signals source.

IMMEDIATE<DEF> Trigger signals from

Shift

+

EXTERNAL

Trigger key

Trigger signals from the TRIG connector in the rear panel.

BUS

Communication command trigger mode.

9

CONNECT MODE

MAXTIDLEXING

SEPARATE<DEF>

BAUDRATE SET

Setting baud rate.

9600<DEFAULT>

9600

19200

38400

COMM. PARITY SET Command parity setting.

NONE<DEFAULT>

EVEN

ODD

ADDRESS SET

Setting communication Flow mode

KEY LOCK SET

EXIT

SYSTTEM SET

Setting keypad password.

MAX CURRENT SET Setup the maximum current.

MAX POWER SET

Setup the maximum power.

MAX VOLTAGE SET Setup the maximum voltage.

VOLTAGE ONSET

VOLTAGE OFFSET

EXIT

LIST SET

MODE SET

FIXED MODE

Setting operation mode.

Fixed mode.

LIST MODE

CALL LIST FILE

Choosing List mode.

Recall list operation file.

EDIT LIST FILE

Edit list operation file.

LIST STORE MODE Users can choose 4 kind of memory space to save the list file.

8 X 120 STEPS

Total 8 files and each file have120 list steps.

4 X 250 STEPS

Total 4 files and each file have250 list steps.

2 X 500 STEPS

Total 2 files and each file have500 list steps.

1 X 1000 STEPS

EXIT

LOAD ON TIMER

Total 1 file and each file have1000 list steps.

TIMER STATE

ON

Setting LOAD ON timer state

When users choose ON, and then turn on the electronic load input, the LOAD ON TIMER will start working. When the LOAD ON

TIMER is reach the setup time, the electronic load input will turn off automatically.

OFF<DEFAULT>

TIMER SET

Setting time of LOAD ON timer.

EXIT

EXIT

10

General Information

Document Orientation

This manual describes the operation of the IT8500 electronic loads. Unless otherwise noted, all units will be referred to by the description "electronic load" throughout this User's manual. The following documents and software are shipped with your electronic load. This User's Guide (this document), contains installation, checkout, front panel information and detailed programming information.

The Getting Started Map will help you find the information you need to complete the specific task that you want to accomplish. Refer to the table of contents or index of each guide for a complete list of the information contained within.

Getting Started Map

Task

Checking out the unit

Verifying proper operation

Using the front panel

Calibrating the unit

Using the front panel

Front panel keys

Front panel examples

Using the programming interface

RS-232 interface

Remote operation mode

Protocol information

Controller Program and Software driver:

Power View PV8500 software

Calibration PC8500 software

Active driver PD8500 OCX software

Where to find information

User’s Guide

User’s Guide

User’s Guide

User’s Guide

CD-ROM

(If you’ve purchased the communication cable, you will get it for free)

Options and Accessories

Options

IT-E151 Rack mounts kit: for install one or two IT8500 series load on the 19 inch rack.

IT-E131 isolated communication cable: This cable converts the electronic load’s serial port (TTL

5V level) to PC RS232 interface.

IT-E132 isolated communication cable: This cable converts the electronic load’s serial port (TTL

5V level) to PC USB interface.

IT-E134 isolated communication cable: This cable converts the electronic load’s serial port (TTL

5V level) to PC GPIB interface.

11

Accessories

Power cord

User’s manual

Software CD-Rom (if you buy the communication cable, you’ll get it for free)

Calibration testing report

Description

The IT8500 series electronic load is used for design, manufacturing, and evaluation of DC power supplies, batteries, and power components and so on. The electronic load contains a processor, serial port connector, front-panel keypad and VFD, and other circuits common to the other entire load module.

IT8500 series electronic load could work in constant current (CC) mode, constant voltage (CV) mode, or constant resistance (CR) mode and constant power (CW) mode.

Features and Capabilities

• High accuracy and high resolution

• Capable to work with constant current (CC), constant voltage (CV), constant resistance (CR) mode and constant power (CW) operation.

• Serial port interface-DB9-RS232 port.

• Triggered input and measurement functions.

• Within the controlled keypad in the front panel

• Built-in pulse generator for continuous, pulsed, and toggled transient mode operation.

• Over voltage, over current, overpower, and over temperature protection.

• Electronic load calibrate by Software.

• Fan speed control by temperature.

• VFD display

• Short circuit test

• Battery testing function.

Front Panel Controls

The front panel has keyboard controls for setting the input voltage, current and resistance. The panel display provides digital readouts of a number of functions including the inputs. Annunciators display the operating status of the electronic load.

Remote Programming

The electronic load may be remotely programmed from the computer via the IT-E131 isolated communication cable.

Operating Modes

The four modes of operation are:

1: Constant current (CC).

2: Constant voltage (CV).

3: Constant resistance (CR).

4: Constant power (CW)

12

Constant CurrentCCMode

I n this mode, the electronic load will sink a current in accordance with the programmed value regardless of the input voltage. CC mode can be set with front panel keys. The CC mode parameters are discussed in the following paragraphs.

I

LOAD

CURRENT

CURRENT

SETTING

LOAD INPUT

VOLTAGE

V

CONSTANTCURRENT MODE

Constant Resistance (CR) Mode

In this mode, the module will sink a current linearly proportional to the input voltage in accordance with the programmed resistance. The CR mode can be set at the front panel. The CR mode parameters are described in the following paragraph.

I

LOAD

CURRENT

SLOPE

RESISTANCE

SETTING

LOAD INPUT

VOLTAGE

V

CONSTANT RESISTANCE MODE

Constant Voltage (CV) Mode

In this mode, the electronic load will attempt to sink enough current to control the source voltage to the programmed value. The module acts as a shunt voltage regulator when operating in the CV mode. The

CV mode can be set at the front panel. The CV mode parameters are described in the following paragraphs.

V

LOAD INPUT

VOLTAGE

VOLT

SETTING

LOAD CURRENT I

CONSTANT VOLTAGE MODE

13

Constant Power (CW) Mode

In this mode, the electronic loads will consumption power accordance with the programmed value regardless of the input voltage. The CW mode can be set with front panel keys. The CW mode parameters are discussed in the following paragraphs.

V

LOAD INPUT V2

VOLTAGE

V3

POWER

SETTING

I2 I3

LOAD

CURRENT

CONSTANT POWER MODE

I

Transient Operation

Transient operation enables the electronic load to periodically switch between two load levels, as might be required for testing power supplies. A power supply's regulation and transient characteristics can be evaluated by monitoring the supply's output voltage under varying combinations of load levels, frequency, and duty cycle.

Transient operation can be turned on and off at the front panel or PC via the IT-E131 isolated communication cable. Before you turn on transient operation, you should set the desired mode of operation as well as all of the parameters associated with transient operation. Transient operation may be used in the CC, CR, or CV or CW modes and can be setup in continuous, pulsed, or toggled operation mode.

Continuous

Generates a repetitive pulse stream the toggles between two load levels and change the state between value A and value B.

10A

5A

2.0ms

3.0ms

Continuous Transient Operation

Pulse

Switch to value B as receiving one trigger signal , taking the pulse time(TWD) of value B , Load will return to Value A .

14

10A

5A

TWD

10ms

TWD

10ms

TRIG TRIG

Pulsed Transient Operation

Trigger Mode

Switching the state between value A and value B once receiving a triggering signal

10A

5A

TRG

TRG

Toggled Transient Operation

List Operation

List mode lets you generate complex sequences of input changes with rapid, precise timing, which may be synchronized with internal or external signals.

List operation can be changed by edit every step value and time in list operation. The parameter of list operation include the group file name, input step setting

(the max steps is 1000 steps),time of one step(1mS~1h)and setting value of one step. In CC mode, dwell time range is 1mS to 6S, which also have an associated value. Note that lists data can only be saved in total 1000 steps memory of 4 situations.

GROUP Total = 1000 steps

2

4

8

500 steps 500 steps

250 steps 250 steps 250 steps 250 steps

120 steps 120 steps 120 steps 120 steps 120 steps 120steps 120 steps 120 steps

When receiving one trigger signal, it will start the list operation until receiving another trigger signal or finish the List operation.

Trigger

0 1 2 3 4 5

List count=1

List sequence

List count=2

15

Triggered Operation

The electronic load has various triggering modes to allow synchronization with other test equipment or events. Such as:

Keypad triggering mode: Press

Shift

+

Trigger

to trigger the electronic load.

TTL triggering mode: Send a high pulse with a constant time more than 5m Sec to the trigger terminals in rear panel to trigger the electronic load.

Command triggering mode: Send triggering command to the electronic load via the serial port.

Input Control

Short On/Off

Load can simulate a short circuit at its input by turning the load on with full-scale current. The short circuit can be toggled on/off at the front panel using the

Shift

+

Short

.Short operation is not influence the operation setting current value , When short operation is on OFF state , Load back to the original setting state.

The actual value of the electronic short is dependent on the mode and current range that are active when the short is turned on.

In CC, CW and CR mode, the max short-circuit current value is 1.2 times of the current range. In CV mode, short-circuit operation is same as the operation of setting CV to 0V.

NOTE

Turning the Short Test on in CV mode may cause the load to draw so much current that the software current limit operates, which may turn the input off. Turning the short circuit on does not affect the programmed settings, and the load input will return to the previously programmed values when the short is turned off.

Input On/Off

Electronic load's input can be toggled on/off at the front panel. Turning the input off (zero current) does not affect the programmed settings. The input will return to the previously programmed values when the input is turned on again.

NOTE

The Input On/Off command supersedes the mode commands and Short Test

On/Off command.

16

Operation Range

Work in the range of Rated Current, Rated voltage and Rated Power, The figure is as following:

Rated voltage

Rated power

Input current I Rated current

Operation mode change state

Rated voltage

C

Software Power Limit

Software Current Limit

A

Input current I Rated current

Protection Features

Electronic load includes the following protection features:

Over Voltage

If input voltage exceeds the voltage limit set by the user, the DC load will turn the input OFF and the buzzer will turn on. The display will show OVER VOLTAGE as following. The maximum voltage limit value is equal to 100%+5% of the maximum rated voltage for each model.

OVER VOLTAGE

Over Current

When operating in CR, CC or CP mode, the load current will be limited by a current limit value set by the user. The maximum current limit value is equal to the maximum rated current for each model. Once the maximum current limit is reached, the DC Load will enter the over current protection state. If the DC load previously operated CR or CP mode, the DC load will automatically revert to CC mode and the VFD display will indicate CC. When the DC load operates in a combined CV / transition mode or CV / List mode, the buzzer will sound if the input current exceeds the current limit and the display will show a flashing current value.

Over Power

If the input power exceeds the power limit in the normal operation mode, Load will work in the over power protection state. VFD displays the information as CW.

17

When work in transition mode and list mode, if the input power exceeds the power limit. Buzzer is mooing, VFD display the flashing current value and voltage value.

Reverse Voltage

This feature protects the load module in case the input DC voltage lines are connected with wrong polarity, if a reverse voltage condition is detected, Buzzer is mooing. VFD display as following:

REVERSE VOLTAGE

Over Temperature

If internal power components ‘s temperature exceeds safe limits (80℃), Over temperature protection is on work . Load will turn off the input and Buzzer is mooing, VFD display as following:

OVER HEAT

Remote Sense Function

When work in CC, CV, CR and CP mode, if load consumes biggish current, it will cause one depressed voltage in the connection line between tested machine and terminals of Load. In order to assure testing precision, Load provides one remote testing terminals in the rear panel, Users could test the output terminals voltage of tested machine through it. Users should set the Load in

REMOTE mode before using the function.

4 Pin trigger and remote sensing connectors:

+ _

IN

Sense

A

Trigger

B

.

Remote Sensing: SENSE (+) and SENSE (–) are the remote sensing inputs. By eliminating the effect of the inevitable voltage drop in the load leads, remote sensing provides greater accuracy by allowing the load to regulate directly at the source's output terminals.

TRIG: A TTL-compatible input that responds to external edge trigger signal. A trigger applied to this input can be used to change settings (voltage, current, resistance, etc.), toggle between settings in transient-toggle mode, or generate a pulse in transient-pulse mode.

You must set the remote sense mode in the menu before using the remote sense function.

Action:

1) Press

Shift

+

Menu key into the menu

2) VFD displays >CONFIG, press

Enter key to confirm

3) Press key to choose>REMOTE SENSE, press

Enter key to confirm

18

4) Press / to choose>ON, press

Enter has been set.

Wiring diagram for remote sense

key to confirm. And the remote sense function

Input port in front panel

+

-

+

-

UUT

Sense port in rear panel

+

-

Saving and Recalling Settings

The electronic load has internal registers in which settings (mode, current, voltage, resistance, transient level, etc.).Users could use recall the relative data as following:

Shift

+

Store

and

Shift

+

Recall

to save and

CC value /CW value /CR value /CV value

Transition current A value /Transition current B value /Transition voltage A value /Transition voltage

B value / Transition power A value /Transition power B value /Transition Resistance A value

/Transition Resistance B value

Current A pulse width time/ Current B pulse width time/Voltage A pulse width time/ Voltage B pulse width time /Power A pulse width time/Power B pulse width time /Resistance A pulse width time

/Resistance B width time

Transition current testing mode/Transition voltage testing mode/Transition power testing mode

/Transition resistance testing mode

Max current value / Max voltage value / Max power value

Action

1) Press

2) Press

3) Press

Shift

Shift

, set a value of current or voltage, press

+

Store

Enter

set a store code at random, press

to confirm.

Enter

to confirm.

+

Recall

,

set the store code that you set before, press you can get the number stored.

Enter to confirm, then

Battery Testing

Experiment proves the test with load is the best method to ensure the battery whether work well or not. Only with the correct load testing, the battery can be confirmed if it was being the expectant life curve location. The electronic loads can be used to test any type of the battery nowadays.

As the accumulator is used by any sheltered equipment or the uninterrupted service system, it is

19

necessary to use the load testing. Because the battery nearly is the lowest reliability component, so it must use the load testing periodic ensure the security of the battery.

Capability test

Electronic load uses CC mode to do the capability test. Make a program to set the voltage in off state.

The accumulator have too low voltage, electronic load intermits test if system checks the accumulator which is near to one rating or in insecurity state. In testing procedure, you could see the accumulator voltage, discharge current, electronic load power and spare capability of accumulator. If connecting with PC software, discharge curve could be displayed in window. This test can reflect the reliability and using time of accumulator. So, it’s necessary to do the test before you change another new accumulator.

Operation:

1. Turn off the load, connect with the tested battery.

2. Press then press

3. Press

Shift

, VFD display CURRENT= *****A. Setting the discharge current of the battery,

Enter to confirm.

+

, VFD display MIN VOLT= ****V, Setting the voltage when turned off,

Press

Enter

to start the capacity testing. When the battery voltage is same as the voltage without power, the load turns off.

During the testing, use ▼and ▲ to change the voltage , actual discharge current ,the electronic load power and the released discharge capacity of the battery .

4. Then press

Shift

+

Battery

, exit the battery capacity testing mode.

V

Battery Voltage

Min voltage

t

I

Load Sink Current

t

20

Von/Voff Operation

You can set voltage value Von/Voff to control the input state on/off for electronic load. When the input voltage reaches the Von value, the load’s input state is on. When the input voltage reaches the

Voff value, the load’s input state is off.

Action for set Von/Voff value:

1) Press

Shift

+

Menu

into menu

2) VFD displays >CONFIG, press key to choose >SYSTEM SET, press

Enter

to confirm

3) VFD displays >MAX CURRENT SET, press key to choose>VOLTAGE ON SET, press

Enter key to confirm

4) VFD displays >VOLT.ON=0.00V, press numeric keys to set Von value (0.1V to max voltage value), press

Enter to confirm

5) Press key to choose >VOLTAGE OFF SET, press

Enter to confirm

( 6) VFD displays >VOLT.OFF=0.00V, press numeric keys to set Voff value (0V to max voltage value), press

Enter to confirm

Installation

Inspection

Damage

When you receive your electronic load, inspect it for any obvious damage that may have occurred during shipment. If there is damage, notify the shipping carrier and nearest Agent office and Support Office immediately.

Items Supplied

The following user replaceable items are included with your electronic load.

Item

Power Cord

Part Number

IT-E171

Description

Users will get one of the power

IT-E172

IT-E173 cords appropriate for your location.

21

IT-E174

User's Guide

Contains installation, checkout, and front panel information and

Software CD-Rom

Programming

Calibration Report

The Instrument calibration report.

Cleaning

Use a dry cloth or one slightly dampened with water to clean the external case parts. Do not attempt to clean internally.

WARNING

To prevent electric shock, unplug unit before cleaning.

Location

The outline diagram in following figure gives the dimensions of your electronic load. The electronic load must be installed in a location that allows sufficient space at the sides and back of the unit for adequate air circulation.

Installation

Dimension :214.5mmW x 88.2mm H x 254.6mm D

Terminal length: 29.4mm Feet height:17.5mm

Outline Diagram

Unit (mm)

22

Carrying Handle

Bench Operation

A fan cools the electronic load by drawing air through the button and sides and exhausting it out the back.

Minimum clearances for bench operation are 25 mm along the sides.

CAUTION

Do not block the fan exhaust at the rear of the Load.

Rack Mounting

The IT 8500 series electronic load can be mounted in a standard 19-inch rack. Rack mount kits are available as Option IT-E151. The electronic load can be mounted in a standard 19-inch rack panel or enclosures using an Option IT-E151 rack mount kit. A rack mount kit for joining two half-rack units is also available by using Option IT-E151.

Rack Installation

Elevation for Installation one electronic load in a standard 19-inch rack

23

Side elevation for Installation one electronic load in a standard 19-inch rack

Elevation for Installation two electronic loads in a standard 19-inch rack

NOTE

Remove the carrying handle and the two plastic ears before rack-mounting the instrument. To remove the handle, grasp the handle by sides and pull outwards and rotate it to a special position to let the arrow on the handle oppose the other arrow on the plastic ears, then pull the handle outward.

After removing the handle, you can use a screwdriver to remove the two plastic ears.

Input Connections

Power Cord

Connect the power cord to the IEC 320 connector on the rear of the unit. If the wrong power cord was shipped with your unit, contact your nearest Agent to obtain the correct cord. See following figure for the part number and ordering options.

24

WARNING

SHOCK HAZARD: the power cord provides a chassis ground through a third conductor. Be certain that your power outlet is of the three-conductor type with the correct pin connected to earth ground.

NOTE

The detachable power cord may be used as an emergency disconnecting device. Removing the power cord from the ac input connector will disconnect ac input power to the unit.

E

N

E

L

E

L N

N

E

L

L N

China United States, Canada Europe United Kingdom

IT-E171 IT-E172 IT-E173 IT-E174

Turn-On Checkout

Introduction

Successful tests in this chapter provide a high degree of confidence that the electronic load is operating properly.

Checkout Procedure

The test in this section checks for proper operation of the electronic load. If you have not already done so, connect the power cord to the unit and plug it in.

Procedure Display Explanation

1. Turn the unit on.

The electronic Load undergoes a self-test when you First turn it on.

During self test, all segments are briefly lit

2. Wait for 1s after turn on electronic load.

EPROM ERROR

EEPROM damage or Lost data of last power off

Run well if no such display, system will go to the step 3 directly.

3. Wait for another 2S. ERROR CAL.DATA

EEPROM Lost calibration data

Run well if no such display, system will go to the step 4 directly.

25

4. Press Shift button and

△▽ keys .

LOAD MODEL:IT85XX

SN:XXX-XXX-XXX

VER x.xx

5. Press

ESC

button

6.Press △▽

0.000V 0.000A

0.000W I: 0.000A

Display the information of the product Type, series number version of software.

Display the actual input voltage and current value.

Display the actual power value and setting value.

In Case of Trouble

Electronic load failure to run during power-on operation. The test of following in this section help you to solve the possible problem when you turn on the power of electronic load.

1) Make sure if you have connected the power cord to the unit and plug it in. Power switch have been pressed.

2) Check the power voltage setting.

Work voltage of load have two type 110V or 220V , Please make sure it is right voltage accordance to the voltage in your area. You could change the voltage setting through dial the switch in the rear panel.

3) Check the fuse of load.

If fuse is blowout, please change it as following specification.

Model Fuse specification

(110VAC)

Fuse specification

(220VAC)

IT8511

IT8512

T0.5A 250V

T0.5A 250V

IT8511B T0.5A 250V

IT8512B T0.5A 250V

IT8512C T0.5A 250V

T0.3A 250V

T0.3A 250V

T0.3A 250V

T0.3A 250V

T0.3A 250V

4) Location of Fuse

FUSE

26

Front Panel Operation

Example

I-set (set up a constant current from 0 to Max current )

Set up a constant DC current input is the first main function of programmable DC electronic load,

IT8500 series electronic load provides two methods to set up the constant DC current input by using the number keyboard and the rotary button. Please see the following operation procedure.

Procedure Operation details VFD display

CURRENT=0.000A Step 1

Press

Step 2

Enter the password or jump the step 4 if your password for reentering

Enter the original value which

Step 3

Step 4

displayed in the LCD or enter a new value by using number keys or Rotary knob to adjust the voltage value

Press

Enter

to confirm

Setup the input current at 4.33A.

Method 1: To set up by using number keyboard

PASSWORD:

CURRENT=*.***A

0.00V 0.000A

Step1. Press button.

Step2. Press numeric button to enter the current value 4.33.

Step3. Press

Enter

button to confirm the current value.

Method 2: To set up by using Rotary SW

If the key board is unlocked by password, directly adjust the Rotary SW button, and voltage will be continually changed from the previews value according the rotation. At the beginning, the cursor will be shown on the last number of the value which is indicated on the VFD, you can move the cursor to the first number, second number etc by using number buttons, and then adjust the Rotary SW to change each number, and let it stay at *.** A. Please see the following description. Then press I-set to confirm the value.

0.00A 0.00V

0.0W 4.33A

Procedure:

Step1. Press button,

Step2. Adjust the Rotary knob to change the value, the operation is as the same as item (1)

Step5. Press

Enter button to confirm the current value.

27

P-set (set up a constant power from 0 to Max power)

IT8500 series electronic load can be set up for a constant power.

Constant power setup procedure is as following:

Procedure

Step 1

Step 2

Step 3

Press

Operation details

P-set

Enter a new value by using numeric keys or Rotary knob to adjust the voltage value

Press

Enter

to confirm.

VFD display

POWER =0.0W

POWER=*.***W

0.000W P:*.000W

R-set (set up a constant resistance from 0.1Ω to 4000Ω)

IT8500 series electronic load can be setup for a constant resistance.

Constant resistance setup procedure is as following:

Procedure Operation details

Step 1

Press

R-set

VFD display

RESISTANCE =0.0R

Step 2

enter a new value by using numeric keys or

Rotary knob to adjust the resistance value

RESISTANCE=*****R

Step 3

Press

Enter

to confirm.

0.000W R:0000R

V-set (set up a constant voltage from 0.1V to Max voltage)

IT8500 series electronic load can be setup for a constant voltage.

Constant voltage setup procedure is as following:

Procedure Operation details VFD display

Step 1

Press

VOLTAGE=1.500V

Step 2

enter a new value by using numeric keys or

Rotary knob to adjust the resistance value

Step 3

Press

Enter

to confirm.

VOLTAGE=*.***V

0.000W V:3.000V

Shift + Store

Procedure

Step 1

Step 2

Press

Press

Shift

Operation details

and

Store

Enter

to confirm.

Shift + Recall

Procedure

Step 1

Step 2

Operation details

Press

Press

Shift

Enter and

Recall

to confirm

28

VFD display

STORE 1

Store the relative data

VFD display

RECALL 1

Recall the saving data

In On/Off input setting

Use

On/Off

On/Off

. to change the input state of electronic load. Switch on to off state by press

On/Off

.

Transition Parameter Setting

Users could press

Shift

+

Shift

S-Tran

+

S-Tran to set the transition parameter.

LEVEL A =0.000A

Setup value A

Enter

WIDTH A = 0.5mS

Setup time width of value A

Enter

Enter

Enter

Enter

LEVEL B=0.000A

WIDTH B= 0.5mS

>CONTINUOUS

>PULSE

>TOGGLED

Setup value B

Setup time width of value B

Choose one of the three transition modes

Finish transition setting

Continuous Transient Operation

In this mode, electronic load will generates a repetitive pulse stream that toggles between two load levels. ; Load could switch the state between two setting value (value A and value

B).

In this following example, assume that the CC mode is active; the applicable transient operation parameters have been set as follows.

For example:

Continuous mode, current level A =5A, width = 2mS. Current level B =10A, width = 3ms. Testing machine input voltage is 12V.

10A

5A

2.0ms

3.0ms

Continuous Transient Operation

Action

1. Select the operation mode (CC,CV,CR or CP), and set a proper value, press the load input.

On/Off

to turn off

2. Press

Shift

+

S-Tran

,

set LEVEL A=5A, press

Enter

, set WIDTH A=3mS, press

Enter

, set LEVER B=10A, press

6. Press

Enter

, set WIDTH B=2mS, press

, the input of load is powered on.

Enter

3. Transition mode now is CONTINOUS, press

4. Press

5. Press

Shift

Shift

+

+

Tran

Tran

Enter to confirm. to activate the transient mode. again to stop the transient operation.

On/Off

29 to confirm.

Pulse Transient Operation

In this mode, generates a transient pulse of programmable width when pulsed transient operation is in effect.

For example: When load receiving one trigger signal, it will switch to 10A current value, and taking

10mS to return the current value of 5A.

10A

5A

TWD

10ms

TWD

10ms

TRIG TRIG

Pulsed Transient Operation

Action

1. Select the operation mode (CC,CV,CR or CP), and set a proper value, press the load input.

On/Off

to turn off

2. Press

Shift

+

S-Tran now is CONTINOUS.

,

set LEVER A=5A, LEVER B=10A, WIDTH B=10mS. Transition mode

3. Press ▼ till >PULSE.

4. Press

5. Press

6. Press

7. Press

Enter

Shift

Shift

Shift

, set transient mode is PULSE.

+

Tran to activate the transient mode.

+

Trigger to start another pulse. Press

Shift

+

Tran again to stop the transient operation.

+

8. Press

On/Off

, the input of load is powered on.

.

Trigger

, get more pulse.

Toggled Transient Operation

In this mode, after transition operation start, Load could change the input between the main level and the transient level when toggled transient operation is in effect.

For example:

When Load receives one trigger signal, Load current will switch between 5A and 10A.

10A

5A

TRG

TRG

Toggled Transient Operation

Action

1. Press

2. Press

3. Press

Shift

Shift

Shift

+

S-Tran

, Setting LEVER A=5A, LEVER B=10A, transition mode is TOGGLED.

+

Tran to activate the transient mode.

+

Trigger switch to the current value of 10A.

30

4. Press

5. Press

Shift

Shift

+

Trigger

, switch between 5A and 10A.

+

Tran again to stop the transient operation.

List Operation

Users can use the front panel keypad or Power View 8500(PV8500) software to programming the list sequence. Please refer to the software user’s guide.

The following example will help you how to do the list operation in front panel.

Trigger

0 1 2 3 4 5

List count=1 List count=2

List sequence

Action

1) Press the button of

2) Press

Shift

+

On/Off

Menu

, execute the input of Load I in OFF state.

, move cursor to the option of menu of CONFIG, Press the next step menu, move cursor to TRIGGER SOURCE. Press

Enter

Enter

into and move cursor to

IMMEDIATE <DEF>, setting trigger source mode is panel IMMEDIATE mode.

3) Press

Enter

to confirm.

to the previous menu, move cursor to LIST SET.

5) Press

Enter

6) Press

MODE.

Enter into the next step menu .move cursor to EDIT LIST FILE. into the next step menu, move cursor to CURRENT LIST, select CURRENT

7) Press

9) Press

Enter

8) Press

Enter

Enter

10) Press

Enter

, move cursor to REPEAT. Setup LIST is in cycle mode.

to confirm, setup the list steps = 5.

to confirm, setup step 1 current =3A.

to confirm, setup step 1 width=6mS.

11) Repeat 7) and 8) operation , set current and width of one step 0A, 5mS;2A,

4mS;6A,2mS;0A,5mS.

12) Press

Enter

to confirm, Menu STORE LIST FILE 1, save file in group1.

13) Move cursor to Mode Set , press

Enter

to enter into the next step menu to set mode is

<LIST MODE >

14) Press

Enter

to confirm

15) Press

Esc

, Press

On/Off

, make Load in ON state. Press

Shift

+

Trigger

, make list operation run or stop.

16) Stop the list operation mode. Move cursor to LIST SET, press

Set in option menu, press

Enter

Enter

, move cursor to Mode

, enter into next step menu. Select mode is <FIXED

MODE>.

17) Press

Enter

to confirm.

31

Fast Recall Function

You recall 10 groups numbers very conveniently which were stored before.

Action

1) Press

Shift

+

Menu

2) Press▼to CONFIG, press

Enter

into submenu, press▼ to SHORTCURT RECALL

3) Press

Enter

, select >ON and press

Enter

to confirm.

4) Press

Esc

two times and quit the menu.

5) Press

1

and you can get the first group number. Press

2

, you can get the second group number. Press

0

, you can get the tenth group number. And if there is not stored number, VFD will show NO EEPROM DATA.

Automatic Testing Function of Electronic Load

You test various parameters of power supplies at different loads. Now we take a kind of charger as an example to explain the usage of the automatic testing of the electronic load.

The test proceeding of R35 charger process Test Method

1 st

step

2 nd

step

3 rd

step

4 th

step

CC

None

CC

CV

5 th

step

CV

6 th

step

Short circuit

5.8~6.15

5.9~6.4

5

3

2

0

210

0

205~245

205~245

205~245

≤245

≤4(input175VAC)

≤1.2(input175VAC)

≤50mVpp

Edit the Testing File

1) Press

Shift

+

Menu

2) Press▼ to >LIST SET.

into menu, VFD displays >CONFIG

3) Press

Enter into submenu, press▼ to>EDIT LIST FILE.

4) Press

Enter and begin to edit the automatic testing file, VFD shows MAX CURR=

20.000A, which means setting the maximum of voltage. The maximum is bigger than 3A, which means CC mode is in high range, here, the maximum is 3A. Press press

Enter

to confirm.

3 and

5) VFD displays MAX VOLT=120.00V, which means setting the maximum of voltage, the maximum is bigger than 18V, which means CV is in high range, here ,the maximum is

18V. Press

1

+

8

to set MAX VOLT=18V, press

Enter to confirm.

6) VFD displays MAX POWER=200.00W, which means setting the maximum of power, here, it is150W, Press

1

+

5

+

0

to set MAX POWER=150W, press

Enter

to confirm.

32

7) VFD displays TEST COUNT=2, which means setting steps of testing, 20 steps are permitted at most, here, they are 6 steps. Press

Enter

to confirm.

6

to set TEST COUNT=6, press

8) Setting the mode of current procedure, press ▲、▼to choose one mode in CONST

CURRENTCONST VOLTAGECONST POWERCONST RESIS. Here, the first step is CC mode, press ▲、▼to >CONST CURRENT, press

Enter to confirm.

9) VFD shows SET 1=20.000A, which means setting the current procedure. Here, the first sis 0.21A, press

0

+

+

2

+

1

, then press

Enter to confirm.

10) Setting whether the current procedure is short circuit or not, press ▲、▼to choose one in

SHORT ON or SHORT OFF. Here the first step is SHORT OFF. Press SHORT OFF, press

Enter to confirm.

11) Select the test number of this step, press▲、▼ to choose >READBACK V,

PRESS

Enter to confirm.

12) VFD displays MIN 1=120.00V, which means setting the lower limit. Here, the first step is

5.8V. Press

5

+

+

8

, press

Enter to confirm.

13) VFD displays MAX 1=120.00V, which requests setting the upper limit. Here, the first step is 6.15V, press

6

+

+

1

+

5

,then press

Enter to confirm.

14) VFD shows DELAY 1= 1.0S〉, which means setting the prolong time, that is how long we can read the testing value after inputting the value we settled. To wait for testing after the input stable, the range of prolong time is 0~25.5 seconds, when the setting is 25.5 seconds, automatic testing will be pause, only the user press

Shift

+

Trigger

,the testing will continue. Here, the first step is 1 second, press confirm.

1 and then press

15) Repeat 9)~14), and set the other process step by step as follows:

Enter to

A. CONST CURRENT,0A,SHORT OFF, READ BACK V, 5.9V, 6.4V,1S

B. CONST VOLTAGE, 5V, SHORT OFF,READ BACK A, 0.205A, 0.245A,1S

C. CONST VOLTAGE, 3V, SHORT OFF, READ BACK A, 0.205A,0.245A,1S

D. CONST VOLTAGE, 2V,SHORT OFF, READ BACK A, 0.205A,0.245A, 1S

E. CONST CURRENT, 0A, SHORT ON, READ BACK A,0A,0.245A, 1S

16) VFD displays SHORT TEST FILE*, which requests saving the files edited to EEPROM, automatically testing files and LIST files use a common memory area, and the area can contain 8 groups of automatic testing files for next usage. Here, the testing file could be saved in the first group, press

1

and press

Enter to confirm.

17) When the edition of automatic testing file is finished, press

Enter menu.

two times to back the

Fast Recall the Test File

1) Press

Shift

+

Menu to enter into menu, VFD displays>CONFIG

2) Press▼ and move the menu to>LIST SET

3) Press

Enter to enter into submenu, VFD displays>MODE SET

4) Press▼ and move the menu to>CALL TEST FILE

5) Press

Enter and recall the file edited

33

Automatic Testing

After editing the automatic testing file, the automatic testing could be carried out by the below steps.

1) Press

Shift

+ to enter into automatic testing, VFD displays the name of current file:

NAME: TEST FILE1

2) Press

Enter to observe the voltage and current we inputted, and also can observe the step number of testing.

3) Press

Shift

+

Trigger and begin to operate, when the automatic testing is pause (the current prolong time of one step is 25.5S), press

Shift

+

Trigger also can make the testing continue.

4) When the automatic testing is finished, the buzzer will hint by tweet (buzzer), VFD reads the result of testing. If the testing passed, VFD reads PASS, or reads FAULT. Press▲、▼ also to observe the numerical value and result of every step.

5) Press

Esc to back the automatic testing.

Select the Resolution between Low Range and High Range

You can adjust the resolution by selecting the low and high range. The first step you should do is to enable this function in the menu.

Action

1) Press

Shift

+

Menu to enter into menu, VFD displays>CONFIG

2) Press

Enter into the submenu, VFD displays>INITIAL CONFIG

3) Press▼to make VFD display RANGE SELECT

4) Press

Enter to confirm, and press▼to choose ON

5) Press

Enter

to confirm

6) Press

Esc

to exit menu

Then you can press

Shift

+▲ to change the voltage range (maximum voltage). If the former maximum voltage value is 120V and the resoulution is 10mV, it will become 18V when you press

Shift

+▲ , and you will get 3 decimal points (xx.xxx) compared to 2 decimal points before.

Wheras if the former maximum voltage is 18V, you can press

Shift

+▼ to make it become

120V, also the resolution will become as 10mV.

On the other hand, you can press

Shift

+▼ to change the currnet range (maximum current). If the former maximum current value is 12A and the resolution is 1mA, it will become 120A when you press

Shift

+▼, and you will get 2 decimal points (xx.xx) compared to 3 decimal points before. wheras if the fromer maximum current is 120A, you can press

Shift

+▼ to make it become 12A, and the resolution will become as 1mA.

34

Parameter

Input rating

( 0 ~ 40 ℃)

Voltage

Current

Power

Range

Specifications

IT8511 IT8512 IT8511B IT8512B

0 to 120V

1mA to 30A

150 W

Accuracy

0 to 120V

1mA to 30A

300 W

Resolution

0 to 500V

1mA to 15A

150 W

Accuracy

IT8511C

0 to 500V 0-120V

1mA to 15A 1mA to 60A

300 W

Resolution

150 W

Accuracy

IT8512C

0-120V

1mA to 60A

300 W

Resolution

Load

Regulation

0-18V ±(0.05%+0.02%FS) 1mV ±(0.05%+0.02%FS)

0-120V / 500V ±(0.05%+0.025%FS) 10mV ±(0.05%+0.025%FS)

0-3A/6A

0-30A/15A/60A

±(0.1%+0.1%FS)

±(0.1%+0.1%FS)

0.1mA

1mA

±(0.1%+0.1%FS)

±(0.1%+0.1%FS)

1mV

10mV

0.1mA

1mA

±(0.05%+0.02%FS)

±(0.05%+0.025%FS)

±(0.1%+0.2%FS)

±(0.15%+0.2%FS)

1mV

10mV

0.2mA

2mA

CV Mode

Regulation

CC Mode

Regulation

CR Mode

Regulation

Input current ≥FS 10%

Input Voltage≥FS 10%

0.1-18V ±(0.05%+0.02%FS) 1mV ±(0.05%+0.02%FS)

0.1-120V/500V ±(0.05%+0.025%FS) 10mV ±(0.05%+0.025%FS)

0-3A/6A

0-30A /15A/60A

±(0.05%+0.1%FS)

±(0.1%+0.1%FS)

0.1mA

1mA

±(0.05%+0.1%FS)

±(0.1%+0.1%FS)

1mV ±(0.05%+0.02%FS)

10mV

0.1mA

1mA

±(0.05%+0.025%FS)

±(0.1%+0.1%FS)

±(0.15%+0.25%FS)

1mV

10mV

0.1mA

1mA

±(1%+0.3%FS) 0.001Ω ±(1%+0.3%FS) 0.001Ω

10-99Ω ±(1%+0.3%FS) 0.01Ω ±(1%+0.3%FS) 0.01Ω ±(1%+0.3%FS) 0.01Ω

1K-4KΩ ±(1%+0.8%FS) 1Ω ±(1%+0.8%FS) 1Ω ±(1%+0.8%FS) 1Ω

0-100W ±(1%+0.1%FS) 1mW ±(1%+0.1%FS) 1mW ±(1%+0.1%FS) 1mW CW Mode Regulation

Input current ≥FS 10%

Input Voltage≥FS 10%

100-300W ±(1%+0.1%FS) 10mW ±(1%+0.1%FS) 10mW ±(0.1%+0.1%FS) 10mW

0-3A/6A

Current Measurement

0-30A /15A/60A

±(0.1% + 0.1%FS)

±(0.2%+0.15%FS)

Voltage Measurement

0-18V ±(0.02% + 0.02%FS)

0-120V/500V ±(0.02%+0.025%FS)

0.1mA ±(0.1% + 0.1%FS) 0.1mA ±(0.1% + 0.2%FS)

1mA ±(0.2%+0.3%FS) 1mA ±(0.2%+0.5%FS)

1mV ±(0.02% + 0.02%FS)

10mV ±(0.02% + 0.025%FS)

1mV ±(0.02% + 0.02%FS)

10mV ±(0.02%+0.025%FS)

0.2mA

2mA

1mV

10mV

Power Measurement

Input current ≥FS 10%

Input Voltage ≥FS 10%

0-100W ±(1%+0.1%FS) 1mW ±(1%+0.1%FS) 1mW ±(1%+0.1%FS) 1mW

100-300W ±(1%+0.1%FS) 10mW ±(1%+0.1%FS) 10mW ±(1%+0.1%FS) 10mW

Battery testing function

Input=0.1-120V Max measurement capacity= 120AH

Resolution =10mA Timer range=1~60000sec

Range of Frequency 0.1Hz-1kHz Frequency error rate<0.5% Transition Mode

35

Remote Operation Mode

DB9 in the rear panel of electronic load could connect with RS-232 through on TTL connector. The following information may help you to know how to control the output of electronic load through PC.

1 Communication cable

IT-E131 RS232 Communication cable

The DB9 interface connector on the rear panel of electronic load is TTL voltage level; you can use the communication cable (IT-E131) to connect the DB9 interface connector of the electronic load and the RS-232 interface connector of computer for the communication.

PC

IT-E131 communication cable

IT

IT-E131 ISOLATED

COMMUNICATION CABLE

RS232 ISOLATION TTL(5V)

859666668889942311

RX

TX

Load

IT-E132 USB Communication cable

The DB9 interface connector on the rear panel of electronic load is TTL voltage level; you can use the communication cable (IT-E132) to connect the DB9 interface connector of the electronic load and the USB interface connector of computer for the communication.

PC

cable

IT

RS232

IT-E131 ISOLATED

COMMUNICATION CABLE

ISOLATION TTL(5V)

859666668889942311

RX

TX

Load

IT-E134 GPIB Communication Cable

The DB9 interface connector on the rear panel of electronic load is TTL voltage level; you can use the communication cable (IT-E134) to connect the DB9 interface connector of the electronic load, and then connect GPIB interface connector of IT-E134 cable and computer with GPIB/IEEE 4888 line for the communication.

36

IT-E134 outer communication adapter

COM interface of

Electronic load

GPIB line

IT-E134 ISOLATED

Serial /IEEE 488 Controller

Note: Forbidden to connect DB9 connector in electronic load directly with PC or other RS232 port.

2 Communication between electronic load and PC

Before using the remote operation mode, please make sure that the baud rate and communication address in electronic load are the same as in the computer software, otherwise, the communication will fail, you can change the baud rate and communication address from the front panel or from computer.

1. Address: the range is from 0 to 254,default setting is 0

2. Baud rate: 4800,9600,19200 and 38400 are selectable, default setting is 4800

3. Data bit:8 bit

4. Stop bit:1

5. Parity:None

Parity=None

Start Bit

8 Data Bits

Stop Bit

Stop Bit

1. DB9 Interface Details

DB9 in the rear panel of electronic load is TTL level signal .it can be connecting with standard PC interface through the IT-E131 isolated communication cable.

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