I-Tech IT8518B User manual

USER’S GUIDE
Programmable DC Electronic Load
Models IT8518
Copyright 2010 All Rights Reserved
Ver2,0/Jan, 2010/ IT8500-401
This user manual is applicable to:
Model: IT8518B/IT8518C/IT8518E/IT8518F
http://www.Datasheet4U.com

QUICK REFERENCE ···················································· 7
THE FRONT PANEL ................................................ 7
THE REAR PANEL ........................................ 8
FRONT PANEL ANNUNCIATORS ......................................... 8
KEY PAD ................................................ 9
IMMEDIATE ACTION KEYS ........................................... 9
MENU OPERATION ............................................ 10
GENERAL INFORMATION ··················································· 12
DOCUMENT ORIENTATION ............................................. 12
GETTING STARTED MAP ............................................... 12
OPTIONS AND ACCESSORIES ......................................... 13
Options ............................................ 13
Accessories ............................................... 13
DESCRIPTION ........................................... 13
FEATURES AND CAPABILITIES .......................................... 13
FRONT PANEL CONTROLS .......................................... 14
REMOTE PROGRAMMING ........................................... 14
OPERATING MODES ............................................. 14
Constant Current(CC)Mode .................................. 14
Constant Resistance (CR) Mode ............................... 14
Constant Voltage (CV) Mode ................................. 15
Constant Power (CW) Mode ................................. 15
TRANSIENT OPERATION .................................. 16
Continuous ................................... 16
Pulse ..................................... 16
Trigger Mode ..................................... 17
LIST OPERATION ............................................. 17
TRIGGERED OPERATION ............................................. 18
INPUT CONTROL ..................................... 18
Short On/Off ..................................... 18
Input On/Off ..................................... 19
Operation Range ............................................ 19
PROTECTION FEATURES .............................................. 20
REMOTE SENSE FUNCTION ..................................... 21
SAVING AND RECALLING SETTINGS ................................... 22
BATTERY TESTING ............................................ 23
VON/VOFF OPERATION ............................................. 24
INSTALLATION ·························································· 25
INSPECTION ................ ............................ 25
Damage ................................................... 25
Introduction
2 USER’S GUIDE

Items Supplied ............................................ 25
Cleaning ............................................... 25
LOCATION ................................................... 26
Installation ............................................... 27
BENCH OPERATION ................................................ 27
INPUT CONNECTIONS ............................................... 27
Power Cord ............................. 27
TURN-ON CHECKOUT ··················································· 28
INTRODUCTION ........................................... 28
CHECKOUT PROCEDURE .......................................... 28
29
FRONT PANEL OPERATION ················································· 30
EXAMPLE ................................................... 30
I-set (set up a constant current from 0 to Max current ) ........ 30
P-set (set up a constant power from 0 to Max power) ........ 31
R-set (set up a constant resistance from 0.1Ω to 4000Ω) ........ 31
V-set (set up a constant voltage from 0.1V to Max voltage) ........ 31
Shift + Store ................................................. 32
Shift + Recall .................................................. 32
In On/Off input setting ............................................. 32
TRANSITION TESTING OPERATION ................................ 32
Transition Parameter Setting ................................... 32
Continuous Transient Operation ................................... 33
Pulse Transient Operation ................................. 33
Toggled Transient Operation ..................................... 34
LIST OPERATION ............................................. 34
FAST RECALL FUNCTION ......................................... 36
AUTOMATIC TESTING FUNCTION OF ELECTRONIC LOAD .............. 36
Edit the Testing File ............................... 37
Fast Recall the Test File ..................................... 38
Automatic Testing ............................................. 38
Select the Resolution between Low Range and High Range ......... 39
SPECIFICATIOIN ······························································· 40
REMOTE OPERATION MODE ··············································· 41
COMMUNICATION CABLE .......................................... 41
COMMUNICATION BETWEEN ELECTRONIC LOAD AND PC ............... 43
USER’S GUIDE 3
In Case of Trouble .............................................
Introduction

Warranty Information
Certication
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 rmware 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
modication or misuse, operation outside of the environmental specications for the product,
or improper site preparation and maintenance. Product number or serial number has been
altered deleted, removed or were unable to identify. Damage from the accident, including but
not limited to lightning, water, re, abuse or negligence.
Assistance
The above statements apply only to the standard product warranty. Warranty options product
maintenance agreements and customer assistance agreements are also available.
4 USER’S GUIDE

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".
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 rmly 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 ammable 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 qualied 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.
USER’S GUIDE 5

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.
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.
Both direct and alternating current
Protective earth (ground) terminal
Caution (refer to accompanying documents)
Safety Symbols
Direct current
Alternating current
DO NOT SERVICE OR ADJUST ALONE
Do not try to do some internal service or adjustment unless another person capable of
rendering rst aid resuscitation is present.
6 USER’S GUIDE

16-character display shows voltage and current measurements
Rotary knob
Power switch ON/OFF
Entry keys:（numeric keys）
Enter values
Increasing or decreasing the setup values
Menu commands
Keypad:
Enable/disable input.
Setup the current, resistance and voltage modes.
Set and reset protection functions.
Scroll through front panel.
1
2
3
4
5
6
Quick Reference
The Front Panel
USER’S GUIDE 7
Quick Reference
1
6
5
4
3
2

Front Panel Annunciators
OFF Front Panel Annunciators Trigger Indicates that the electronic load is waiting
an initiate and trigger to occur.
CC Constant current (CC) mode.Sense ndicates that the electronic load is in
Remote sensing state
CV Constant voltage (CV) mode. Error A errors have occurred
CW Constant power (CW) mode. Link In the communication state
CR Resistance (CR) mode. Rmt Indicates that the electronic load is in remote
state (RS-232). In the remote state, only the
active key is the Local key.
Tran The input channel is enabled
for transient operation.
Shift Indicates that the shift key has been
pressed.
List List mode is initiated or running Lock keyboard is locked by password
Unr The input is unregulated.
The Rear Panel
Quick Reference
8 USER’S GUIDE
Input terminals
3 Pin IEC320 ac input connector
Fuse
Power switch (110V / 220V)
9-Pin COM port interface connector
4 Pin Trigger and Remote sensing connectors
1
2
3
4
5
6
1
2
3
4
6
5

Key Pad
Immediate Action Keys
1
4
2
8 9
605
7
3ESC
I-set V-set
R-set
Shift
P-setENTER
POWERA B
Tran
Store Recall S-Tran Menu
Local Battery Short Trigger
On/Off
Switch to A setting value
Switch to B setting value
Start /Stop transition operation
Press to store an existing electronic load state in non-volatile Memory.
Press to recall an existing electronic load state in non-volatile Memory.
Set the transition operation parameter
Enter operation Menu.
When the load is controlled by PC, press these keys to enable the
front panel key
Battery discharge electronic operation
Turn on or turn off short circuit Test.
Causes a trigger to occur. Change the trigger source is IMMIDIATE
Shift
Shift
Shift
Shift
Shift
Shift
Shift
Shift
Shift
Shift
Shift
+
+
+
+
+
+
+
+
+
+
+
Trigger
A
B
Menu
S-Tran
Battery
Local
Store
Tran
Recall
Short
~ 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.
Shift keys.
Power ON/OFF
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.
Conrmation key.
Shift
l-set
On/Off
V-set
Enter
0
9
Esc
P-set
R-set
USER’S GUIDE 9
Quick Reference

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 key, you could get the selected menu function.
Press back to the previous menu selection page.
Enter
Esc
MENU
CONFIG
INITIAL CONFIG Return to the factory default setup value.
INPUT RECALL Setting Power-on state of Load.
ON When users turn on the electronic load; the electron
load setup value will keep the state
of last time when users turn off the electronic load.
OFF<DEFAULT> Disable this function.
POWER-ON RECALL Setup of the electronic load input state in Power on.
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 will keep the state 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 Quickly recall the data stored before
ON
OFF>
RANGE SELECT Change the measure precision of voltage and current
EXTERNAL
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 + key
EXTERNAL Trigger signals from the TRIG connector in the rear panel.
BUS Communication command trigger mode.
CONNECT MODE
MAXTIDLEXING
SEPARATE<DEF>
Trigger
Shift
Quick Reference
10 USER’S GUIDE

BAUDRATE SET Setting baud rate.
4800<DEFAULT>
9600
19200
38400
COMM. PARITY SET Command parity setting.
NONE<DEFAULT>
EVEN
ODD
ADDRESS SET Setting communication Flow mode
Setting keypad password.
EXIT
SYSTEM SET
Setup the maximum current.
Setup the maximum power.
Setup the maximum voltage
VOLTAGE ONSET
VOLTAGE OFFSET
EXIT
LIST SET
MODE SET Setting operation mode.
FIXED MODE Fixed mode.
LIST MODE Choosing List mode.
CALL LIST FILE Recall list operation le.
EDIT LIST FILE Edit list operation le.
LIST STORE MODE Users can choose 4 kind of memory space to
save the list le.
8 X 120 STEPS Total 8 les and each le have120 list steps.
4 X 250 STEP Total 4 les and each le have250 list steps.
2 X 500 STEPS Total 2 les and each le have500 list steps
1 X 1000 STEPS Total 1 le and each le have1000 list steps.
EXIT
LOAD ON TIMER
TIMER STATE Setting LOAD ON timer state
ON 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
offautomatically.
OFF
Setting time of LOAD ON timer.
EXIT
EXIT
TIMER SET
MAX POWER SET
MAX CURRENT SET
MAX VOLTAGE SET
KEY LOCK SET
USER’S GUIDE 11
GENERAL INFORMATION

General Information
Getting Started Map
This manual describes the operation of the IT8500 series 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 nd the information you need to complete the
specic task thatyou want to accomplish. Refer to the table of contents or index of each guide for
a complete list of the information contained within.
Document Orientation
Task Where to nd information
Checking out the unit
Verifying proper operation
Using the front panel
User’s Guide
Using the front panel
Front panel keys
Front panel examples
User’s Guide
Using the programming interface
RS-232 interface User’s Guide
Remote operation mode
Protocol information User’s Guide
Controller Program and Software driver:
Power View PV8500 software
Active driver PD8500 OCX software
CD-ROM (If you’ve purchased the communication
cable, you will get it for free)
GENERAL INFORMATION
12 USER’S GUIDE

Options and Accessories
Options
IT-E131 isolated communication cable: This cable converts the electronic load’s series port
(TTL 5V level) to PC RS232 interface.
IT-E132 isolated communication cable: This cable converts the electronic load’s series port
(TTL 5V level) to PC USB interface.
IT-E134 isolated communication cable: This cable converts the electronic load’s series port
(TTL 5V level) to PC GPIB interface.
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.
• Fan speed control by temperature.
• VFD display
• Short circuit test
• Battery testing function.
USER’S GUIDE 13
GENERAL INFORMATION

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 displaythe operating status of the electronic load.
Operating Modes
The four modes of operation are:
1: Constant current (CC)
2: Constant voltage (CV)
3: Constant resistance (CR)
4: Constant power (CW)
Constant Current(CC)Mode
In 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.
LOAD
CURRENT
LOAD INPUT
VOLTAGE
I
V
CURRENT
SETTING
CONSTANTCURRENT MODE
Remote Programming
The electronic load may be remotely programmed from the computer via the IT-E131 isolated
communication cable.
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.
GENERAL INFORMATION
14 USER’S GUIDE

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.
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.
LOAD
CURRENT
LOAD INPUT
VOLTAGE
I
V
SLOPE
RESISTANCE
SETTING
CONSTANT RESISTANCE MODE
LOAD CURRENT
LOAD INPUT
VOLTAGE
I
V
VOLT
SETTING
CONSTANT VOLTAGE MODE
LOAD
CURRENT
LOAD INPUT
VOLTAGE
I
VPOWER
SETTING
CONSTANT POWER MODE
V2
V3
I2 I3
USER’S GUIDE 15
GENERAL INFORMATION

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.
Continuous
Generates a repetitive pulse stream the toggles between two load levels and change the state
between value A and value B.
Pulse
Switch to value B as receiving one trigger signal , taking the pulse time(TWD) of value B ,
Load will return to Value A .
10A
5A
Continuous Transient Operation
2.0ms 3.0ms
10A
5A
Pulsed Transient Operation
10ms
TWD10ms
TWD
TRIG TRIG
GENERAL INFORMATION
16 USER’S GUIDE

Trigger Mode
Switching the state between value A and value B once receiving a triggering signal
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 le 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.
When receiving one trigger signal, it will start the list operation until receiving
another trigger signal or nish the List operation.
10A
5A
TRG TRG
Toggled Transient Operation
GROUP Total = 1000 steps
1 1000 steps
2 500 steps 500 steps
4 250 steps 250 steps 250 steps 250 steps
8 120 steps 120 steps 120 steps 120 steps 120 steps 120 steps 120 steps 120 steps
Trigger
10 23 4 5
List count=1 List count=2
List sequence
USER’S GUIDE 17
GENERAL INFORMATION

Triggered Operation
The electronic load has various triggering modes to allow synchronization withother test
equipment or events. Such as:
Keypad triggering mode: Press + 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.
Short On/Off
Load can simulate a short circuit at its input by turning the load on with full-scale current.
The shortcircuit can be toggled on/off at the front panel using the + .
Short operation is not inuence 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.
Input Control
Trigger
Shift
Shift Short
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
GENERAL INFORMATION
18 USER’S GUIDE

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.
Operation Range
Work in the range of Rated Current, Rated voltage and Rated Power,
The gure is as following:
INPUT VOLTAGE V
Rated voltage
Rated power
Input current I Rated current
INPUT VOLTAGE V
Rated voltage
Software Power Limit
Input current I Rated current
Software Current Limit
C
A
Operation mode change state
USER’S GUIDE 19
GENERAL INFORMATION

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
REVERSE VOLTAGE
OVER HEAT
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 ashing 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.
When work in transition mode and list mode, if the input power exceeds the power limit. Buzzer
is mooing, VFD display the ashing current value and voltage value.
Reverse Voltage
This feature protects the load module in case the input
DCvoltage lines are connected with wrong polarity,
if a reverse voltage condition is detected, Buzzer is mooing. VFD display as following:
Over Temperature
If internal power component‘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:
GENERAL INFORMATION
20 USER’S GUIDE