I-Tech IT8500plus Series User manual

DC Programmable Electronic
Loads
IT8500plus Series User Manual
Model:IT8511+/IT8511A+/IT8511B+/IT8512+/IT8512A
+/IT8512B+/IT8512C+/IT8512H+/IT8513A+/IT8513B
+/IT8513C+/IT8514C+/IT8514B+/IT8516C+
Version: 2.1

Notices
© Itech Electronic, Co., Ltd. 2018
No part of this manual may be
reproduced in any form or by any means
(including electronic storage and
retrieval or translation into a foreign
language) without prior permission and
written consent from Itech Electronic,
Co., Ltd. as governed by international
copyright laws.
Manual Part Number
IT8500+-402008
Revision
Second Edition: Mar. 15,
2018
Itech Electronic, Co., Ltd.
Trademarks
Pentium is U.S. registered trademarks
of Intel Corporation.
Microsoft, Visual Studio, Windows and
MS Windows are registered trademarks
of Microsoft Corporation in the United
States and/or other countries and
regions.
Warranty
The materials contained in this
document are provided “as is”, and
is subject to change, without prior
notice, in future editions. Further, to
the maximum extent permitted by
applicable laws, ITECH disclaims
all warrants, either express or
implied, with regard to this manual
and any information contained
herein, including but not limited to
the implied warranties of
merchantability and fitness for a
particular purpose. ITECH shall
not be held liable for errors or for
incidental or indirect damages in
connection with the furnishing, use
or application of this document or of
any information contained herein.
Should ITECH and the user enter
into a separate written agreement
with warranty terms covering the
materials in this document that
conflict with these terms, the
warranty terms in the separate
agreement shall prevail.
Technology Licenses
The hardware and/or software
described herein are furnished under a
license and may be used or copied only
in accordance with the terms of such
license.
Restricted Rights Legend
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 Notices
A CAUTION sign denotes a
hazard. It calls attention to an
operating procedure or practice
that, if not correctly performed
or adhered to, could result in
damage to the product or loss of
important data. Do not proceed
beyond a CAUTION sign until
the indicated conditions are fully
understood and met.
A WARNING sign denotes a
hazard. It calls attention to an
operating procedure or practice
that, if not correctly performed
or adhered to, could result in
personal injury or death. Do not
proceed beyond a WARNING
sign until the indicated
conditions are fully understood
and met.
NOTE
A NOTE sign denotes
important hint. It calls attention
to tips or supplementary
information that is essential for
users to refer to.

IT8500+ User Manual
Copyright © Itech Electronic Co., Ltd. i
Quality Certification and Assurance
We certify that series IT8500+ electronic load meets all the published
specifications at time of shipment from the factory.
Warranty ITECH warrants that the product will be free from defects in material and
workmanship under normal use for a period of one (1) year from the date of
delivery (except those described in the Limitation of Warranty below).
For warranty service or repair, the product must be returned to a service center
designated by ITECH.
The product returned to ITECH for warranty service must be shipped
PREPAID. And ITECH will pay for return of the product to customer.
If the product is returned to ITECH for warranty service from overseas, all
the freights, duties and other taxes shall be on the account of customer.
Limitation of Warranty
This Warranty will be rendered invalid in case of the following:
Damage caused by circuit installed by customer or using customer own
products or accessories;
Modified or repaired by customer without authorization;
Damage caused by circuit installed by customer or not operating our
products under designated environment;
The product model or serial number is altered, deleted, removed or made
illegible by customer;
Damaged as a result of accidents, including but not limited to lightning,
moisture, fire, improper use or negligence.
Safety Symbols
Direct current
ON (power on)
Alternating current
OFF (power off)
Both direct and alternating
current
Power-on state
Protective conductor terminal
Power-off state
Earth (ground) terminal
Reference
terminal
Caution, risk of electric shock
Positive terminal
Warning, risk of danger (refer
to this manual for specific
Warning or Caution
information)
Negative terminal
Frame or chassis terminal
-
-

IT8500+ User Manual
Copyright © Itech Electronic Co., Ltd. ii
Safety Precautions
The following safety precautions must be observed during all phases of
operation of this instrument. Failure to comply with these precautions or specific
warnings elsewhere in this manual will constitute a default under safety
standards of design, manufacture and intended use of the instrument. ITECH
assumes no liability for the customer’s failure to comply with these precautions.
Series IT8500+ electronic load supports 110V/220VAC input and need to
switch the input voltage before operation.
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 power line during delivery and should
be connected to a socket with a protective earth terminal. Before operation,
be sure that the instrument is well grounded.
Make sure to use the power cord supplied by ITECH.
Check all marks on the instrument before connecting the instrument to
power supply.
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 instrument if the detachable cover is removed or loosen.
To prevent the possibility of accidental injuries, be sure to use the power
adapter supplied by the manufacturer only.
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.
Never use the instrument with a life-support system or any other equipment
subject to safety requirements.
Failure to use the instrument as directed by the manufacturer may render
its protective features void.
Always clean the casing with a dry cloth. Do not clean the internals.
Make sure the vent hole is always unblocked.

IT8500+ User Manual
Copyright © Itech Electronic Co., Ltd. iii
Environmental Conditions
The instrument is designed for indoor use and an area with low condensation.
The table below shows the general environmental requirements for the
instrument. The speed of fan will change intelligently by the temperature of
radiator. When the temperature is up to 40°C, the fan will be on and adjust
intelligently when temperature changes.
Environmental Conditions
Requirements
Operating temperature
0°C to 40°C
Operating humidity
20%-80% (non-condensation)
Storage temperature
-20°C to 70 °C
Altitude
Operating up to 2,000 meters
Pollution degree
Pollution degree 2
Installation category
II
Note
To make accurate measurements, allow the instrument to warm up for 30 min before
operation.
Regulatory Markings
The CE mark indicates that the product
complies with all the relevant European
legal directives. The specific year (if any)
affixed refers to the year when the design
was approved.
The instrument complies with the WEEE
Directive (2002/96/EC) marking
requirement. This affixed product label
indicates that you must not discard the
electrical/electronic product in domestic
household waste.
This symbol indicates the time period
during which no hazardous or toxic
substances are expected to leak or
deteriorate during normal use. The
expected service life of the product is 10
years. The product can be used safely
during the 10-year Environment Friendly
Use Period (EFUP). Upon expiration of
the EFUP, the product must be
immediately recycled.
Waste Electrical and Electronic Equipment (WEEE)
Directive
2002/96/EC Waste Electrical and Electronic Equipment
(WEEE) Directive
This product complies with the WEEE Directive (2002/96/EC)
marking requirement. This affix product label indicates that you
must not discard the electrical/electronic product in domestic
household waste.
Product Category

IT8500+ User Manual
Copyright © Itech Electronic Co., Ltd. iv
With reference to the equipment classifications described in the
Annex I of the WEEE Directive, this instrument is classified as a
“Monitoring and Control Instrument”.
To return this unwanted instrument, contact your nearest
ITECH office.

IT8500+ User Manual
Copyright © Itech Electronic Co., Ltd. v
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

IT8500+ User Manual
Copyright © Itech Electronic Co., Ltd. vi
Content
Quality Certification and Assurance............................................................................................................................i
Warranty .....................................................................................................................................................................i
Limitation of Warranty ................................................................................................................................................i
Safety Symbols ............................................................................................................................................................i
Safety Precautions......................................................................................................................................................ii
Environmental Conditions.........................................................................................................................................iii
Regulatory Markings .................................................................................................................................................iii
Waste Electrical and Electronic Equipment (WEEE) Directive...................................................................................iii
Compliance Information ............................................................................................................................................v
Chapter1 Inspection and Installation ............................................................................................................. 1
1.1 Verifying the Shipment.........................................................................................................................................1
1.2 Instrument Size Introduction ...............................................................................................................................3
1.3 Adjustment of Load Handle .................................................................................................................................6
1.4 Disassembly of Load Handle ................................................................................................................................7
1.5 Rack Mounting .....................................................................................................................................................8
1.6 Connect the Power Cord ......................................................................................................................................8
1.7 Connect the Device Under Test (DUT)..................................................................................................................9
Chapter2 Quick Start ................................................................................................................................... 12
2.1 Brief Introduction...............................................................................................................................................12
2.2 Product Feature..................................................................................................................................................12
2.3 Front Panel Introduction ....................................................................................................................................13
2.4 Front Panel Keys .................................................................................................................................................14
2.5 Combination Keys...............................................................................................................................................15
2.6 VFD Annunciators...............................................................................................................................................15
2.7 Rear Panel Introduction .....................................................................................................................................16
2.8 Power-on Selftest ...............................................................................................................................................17
Chapter3 Functions and Characteristics ....................................................................................................... 20
3.1 Local Mode/Remote Mode ................................................................................................................................20
3.2 Operation Mode.................................................................................................................................................20
3.2.1 Constant Current Mode (CC).................................................................................................................20
3.2.2 Constant Voltage Mode (CV).................................................................................................................21
3.2.3 Constant Resistance Mode (CR)..........................................................................................................22
3.2.4 Constant Power Mode (CW)..................................................................................................................23
3.3 Input On/Off Control ..........................................................................................................................................23
3.4 Key Lock Function...............................................................................................................................................24
3.5 Short-circuit Analog Function.............................................................................................................................24
3.6 System Menu (System).......................................................................................................................................24
3.7 Config Menu (Config) .........................................................................................................................................26
3.8 Trigger Function .................................................................................................................................................27
3.9 LIST Operation ....................................................................................................................................................28
3.10 Test Function ....................................................................................................................................................30
3.10.1 Transient Test Function........................................................................................................................30
3.10.2 OCP Test Function................................................................................................................................33
3.10.3 OPP Test Function................................................................................................................................34
3.10.4 Battery Discharge Test.........................................................................................................................35
3.10.5 CR-LED Test Function .........................................................................................................................37
3.10.6 Measurement of Voltage Rise Time...................................................................................................39
3.11 Saving and Recalling Settings ...........................................................................................................................39
3.12 VON Function ...................................................................................................................................................40
3.13 Protection Function..........................................................................................................................................41
3.14 Current Monitoring (I Monitor)........................................................................................................................42
3.15 Ripple Function ................................................................................................................................................42
Chapter4 Automatic Test Function............................................................................................................... 44
4.1 Introduction .......................................................................................................................................................44
4.2 Automatic Test Mode Switching.........................................................................................................................44

IT8500+ User Manual
Copyright © Itech Electronic Co., Ltd. vii
4.2.1 Test Mode for IT8500+ ...........................................................................................................................45
4.2.2 Test Mode for IT8500..............................................................................................................................48
Chapter5 Specifications ............................................................................................................................... 51
Specifications ...........................................................................................................................................................51
Supplementary Characteristics ................................................................................................................................65
Chapter6 Communication Interfaces ........................................................................................................... 66
6.1 Communication Modules Introduction ..............................................................................................................66
6.2 Communication with PC.....................................................................................................................................68
Appendix.............................................................................................................................................................. 70
Specifications of Red and Black Test Lines ...............................................................................................................70

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 1
Chapter1 Inspection and Installation
1.1 Verifying the Shipment
Unpack the box and check the contents before operating the instrument. If
wrong items have been delivered, if items are missing, or if there is a defect
with the appearance of the items, contact the dealer from which you purchased
the instrument immediately. The package contents include:
Checklist of Package Contents
Item
Qty.
Model
Remarks
Electronic Loads
x1
IT8500+ series
The IT8500+ series include:
IT8511+/IT8511A+/IT8511B+/IT8
512+/IT8512A+/IT8512B+/IT851
2C+/IT8512H+/IT8513A+/IT851
3B+/IT8513C+/IT8514C+/IT851
4B+/IT8516C+
Power cord
x1
IT-E171/IT-E17
2/IT-E173/IT-E1
74
User may select an appropriate
power cord that matches the
specifications of power socket
used in the area. See the
Section Connecting the Power
Cord for details.
CD
x1
-
It contains IT8500+ electronic
load User’s Manual,
Programming Guide and other
user documentations.
Ex-factory Test
Report
x1
-
It is the test report of the
instrument before delivery.
NOTE
Upon verification of the shipment, keep the package and relevant contents thereof in a
safe place. When returning the instrument for warranty service or repair, the specified
packing requirements shall be met.
The IT8511+/IT8511A+/IT8511B+/IT8512+/IT8512A+/IT8512B+/IT8512H+/
IT8512C+/IT8512H+/IT8512C+/IT8513A+/IT8513C+ models have separately
sold optional accessories. Please refer to Chapter5 Communication
Interfaces for details of each accessory.
Device Name
Model
Accessories Description
Rack mount kit
IT-E151
Select this accessory when the user needs
to install the instrument on a special
bracket.
RS232
Communication
Module
IT-E121
Select this accessory when users need to
use the standard RS232 extension cable to
connect the DB9 interface connector of the
DC load and the RS-232 interface
connector of computer for the
communication.
RS232
Communication
Module
IT-E121A
The DB9 interface connector of the RS232
changes from female to male, so that can
be directly connected to the standard LAN
interface.

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 2
Device Name
Model
Accessories Description
USB
Communication
Module
IT-E122
Select this accessory when you need to
use IT-E122 and an a standard USB
extension cable (type B female connector
at one end and type A at one end) to
connect the DB9 interface connector of the
DC load and the USB interface connector
of computer for the communication.
RS485
Communication
Module
IT-E123
Select this accessory when you need to
use the communication module IT-E123
and a standard RS485-RS232 conversion
cable to connect the DB9 interface
connector of the DC load and the RS-232
interface connector of computer for the
communication.

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 3
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.
IT8500+ series electronic load different models are not the same size, the detail
size of the electronic load is shown as below.
IT8511+/IT8511A+/IT8511B+/IT8512+/IT8512B+/IT8512C+/IT8512H+ Model
Detailed Dimension Drawing

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 4
IT8513A+/IT8513C+ Model
Detailed Dimension Drawing
IT8513B+/IT8514B+/ IT8514C+ Model
Detailed Dimension Drawing

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 5
IT8516C+ Model

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 6
1.3 Adjustment of Load Handle
IT8511+/IT8511A+/IT8511B+/IT8512+/IT8512A+/IT8512B+/IT8512C+/IT8512H
/IT8513A+/IT8513C+ series loads are equipped with a handle for user to easily
carry and place it.
The load handle may be adjusted based on three methods (as shown in icons
below). Be sure that appropriate force is applied to adjust the load handle to
appropriate position.
Detailed Dimension Drawing

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 7
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.

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 8
1.5 Rack Mounting
IT8511+/IT8511A+/IT8511B+/IT8512+/IT8512A+/IT8512B+/IT8512C+/IT8512H
+/IT8513A+/IT8513C+ loads 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.
IT8513B+/IT8514B+/IT8514C+/IT8516C+ need not mount on rack, they can be
installed on cabinet directly by screw.
1.6 Connect the Power Cord
Before connecting the power cord
To prevent electric shock and damage to the instrument, observe the following
precautions.
Before connecting the power cord, please confirm the 110V / 220V transfer
switch to ensure that the switch of the load matches the supply voltage.
Otherwise, the instrument may be damaged.
Connect the power cord after checking that the power switch of the
instrument is turned OFF. Only use the power cord supplied as a standard
accessory.
To prevent electric shock, be sure to take protective earthing. Please
connect the power cable to the socket with the protective earth terminal.
Do not use the extension cord without protective grounding function,
otherwise the protection function will be invalid.
Please use theAC power socket matching the power cord shipped with the
box and take the protective earthing measures. If you can not use a
suitable AC power cord, do not use the instrument.
Power cord type
Select from the following Schedule of Power Cord Specifications an appropriate
power cord that matches the voltage for the area in which you use the
instrument. If the power cord included in the instrument you purchased does
not match the voltage, contact the dealer or manufacturer for change.
China
IT-E171
United States &
Canada
IT-E172
Europe
IT-E173
England
IT-E174
AC input level A transfer switch is selectable on the rear panel:
Option Opt.1: 220V ±10% 50Hz/60Hz
Option Opt.2: 110V ±10% 50Hz/60Hz

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 9
Steps 1. Check whether the power switch of the instrument is turned OFF.
2. Connect one end of the power cord to the AC input connector on the rear
panel of the instrument.
3. Connect the other end of the power cable to the socket configured with
protective earth.
1.7 Connect the Device Under Test (DUT)
Before connecting the DUT
To prevent electric shock and damage to the instrument, observe the following
precautions.
Before connecting the DUT, turn off the power of the test loop to avoid the
risk of electric shock during connection.
To avoid electrical shock, before testing, please make sure the rating
values of the testing cables, and do not measure the current that higher
than the rating value.
Always use test cables provided by ITECH to connect the equipment. If
test cables from other factories are used, please check that the test cable
can withstand maximum current.
Specification Test cables are not standard accessories of the instrument. Please select
optional red and black test cables for individual sales based on the maximum
current value. For specifications of test cables and maximum current values,
refer to “Specifications of Red and Black Test Lines” in “Appendix”.
Introduction of Binding Posts
The IT8500+ series (except IT8516C+) load front panel contains the following
terminals and the maximum rated current of the terminal at position (A) is the
maximum rated input current of the instrument. Securely fasten all wires by
hand-tightening the binding posts. You can also insert standard banana plugs
into the front of the connectors as shown in (B), and the maximum rated current
at (B) is 10 A.
Local measurement
1. Check whether the power switch is in Off position.
2. (Optional) Unlock the load input terminal cover.
3. Unscrew the screws of the input terminals. Connect the red and black test
cables to the input terminals. Re-tighten the screws.
When maximum current that one test cable can withstand fails to meet the

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 10
current rated current, use several pieces of red and black test cables. For
example, the maximum current is 1,200A, then 4 pieces of 360A red and
black cables are required.
4. (Optional) Install the load input terminal cover.
5. Directly connect the other end of the red and black cables to the DUT
terminal.
Remote measurement
Remote sensing is used to counteract the effect of lead resistance. For
example, if you connect a power supply to the DC Load, the voltage at the
power supply's terminals will not be the same as the voltage at the DC Load's
terminals if there is a current flowing because of the finite resistance from the
wires. Using remote sensing, you can sense the voltage at the power supply's
terminals, effectively removing the effect of the voltage drop in the connection
wire.
When using remote sensing, the power displayed by the instrument includes
both the power dissipated inside the instrument and the power dissipated in the
leads from the power supply to the DC Load's input terminals.
Sense terminals in the rear panel displayed as follows:
Remote Sensing: SENSE (+) and SENSE (–)are the remote sensing inputs.
By eliminating the effect of the inevitable voltage drop in the DC load leads,
remote sensing provides greater accuracy by allowing the DC load to regulate
directly at the source's output terminals.
Before using the remote measurement function, you must first set the load to
remote measurement mode. The steps are as follows:
1. Press [Shift] + [9] key into the menu.
2. Press Right/Left key to select SENSE, press [Enter] key to confirm.
3. Select ON, then the remote sense function has been set.
Note:
When not using the remote measurement function, press the OFF key to
close the remote measurement mode.
4. Refer the following diagram to connect test cables.
Wiring Diagram for Remote Sensing:

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 11
Note:
Test cables and Sense cables should be as short as possible, and Sense
cables should be twisted together.