I-Tech IT8700 Series User manual

DC Programmable Electronic
Loads
Series IT8700 User Manual
Model: IT8722/IT8723/IT8731/IT8732/IT8733/
IT8722B/IT8732B/IT8733B/
IT8722P/IT8723P/IT8731P/IT8732P/IT8733P/
IT8722BP/IT8732BP/IT8733BP/
IT8702/IT8703/IT8701P/IT8702P/IT8703P
Version: 4.4

Notices
© Itech Electronic, Co., Ltd. 2021
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
IT8700-402216
Revision
Fourth Edition, July. 1, 2021
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.

IT8700 User Manual
Copyright © Itech Electronic Co., Ltd. i
Quality Certification and Assurance
We certify that series IT8700 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
-
-

IT8700 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.
⚫Do not use the instrument if it is damaged. Before operation, check the
casing to see whether it cracks. Do not operate the instrument in the
presence of inflammable gasses, vapors or dusts.
⚫The electronic load is provided with a three-core power line during delivery
and should be connected to a three-core junction box. Before operation, be
sure that the 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.

IT8700 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

IT8700 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.

IT8700 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

IT8700 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
1.1VERIFYING THE SHIPMENT...........................................................................................................................................1
1.2 INSTALLATION SIZE INTRODUCTION................................................................................................................................1
1.3MODULE INSTALLATION ..............................................................................................................................................8
1.3.1 Channel number........................................................................................................................................9
1.4MAINFRAME INSTALLATION .......................................................................................................................................10
1.5CONNECTING THE POWER CORD ................................................................................................................................10
1.6 CONNECTING THE DEVICE UNDER TEST........................................................................................................................12
CHAPTER2 QUICK START ................................................................................................................................ 16
2.1 BRIEF INTRODUCTION...............................................................................................................................................16
2.2 INTRODUCTION .......................................................................................................................................................17
2.3FRONT PANNEL INTRODUCTION..................................................................................................................................18
2.4REAR PANEL DESCRIPTION .........................................................................................................................................19
2.5POWER-ON SELFTEST ...............................................................................................................................................19
CHAPTER3 PANEL FUNCTION INTRODUCTION................................................................................................ 22
3.1 MAINFRAME OPERATION ..........................................................................................................................................22
3.1.1 Mainframe keyboard functions introduction.........................................................................................22
3.1.2 Menu list ...................................................................................................................................................24
3.1.3 Channel option.........................................................................................................................................28
3.1.4 Save and recall........................................................................................................................................29
3.1.5 Configuration menu introduction...........................................................................................................29
3.1.6 Module keyboard lock.............................................................................................................................29
3.2 MODULE OPERATION ...............................................................................................................................................29
3.2.1 Single channel module panel ................................................................................................................29
3.2.2 Dual channel module panel...................................................................................................................30
3.3 VFD INDICATOR FUNCTION DESCRIPTION......................................................................................................................31
3.4 8-PIN CONTROL CONNECTOR......................................................................................................................................31
3.4.1 External trigger connections..................................................................................................................32
3.4.2 External ON/OFF control connection ...................................................................................................33
3.5 EXTENDED FRAME CONNECTIONS................................................................................................................................33
3.6 CONTROLLING LINK ..................................................................................................................................................34
CHAPTER4 OPERATIONS INTRODUCTION ....................................................................................................... 36
4.1 LOCAL/REMOTE OPERATION.......................................................................................................................................36
4.2 PC CONTROL CONNECTION ........................................................................................................................................36
4.3 OPERATING MODES..................................................................................................................................................36
4.3.1 Constant current (CC) mode .................................................................................................................37
4.3.2 Constant resistance (CR) mode............................................................................................................38
4.3.3 Constant voltage (CV) mode.................................................................................................................38
4.3.4 Constant power (CW) mode..................................................................................................................39
4.3.5 Compound Operation Mode ..................................................................................................................40
4.3.6 Operations................................................................................................................................................41
4.4 TRANSIENT OPERATION.............................................................................................................................................42
4.4.1 Continuous...............................................................................................................................................43
4.4.2 Pulsed.......................................................................................................................................................43
4.4.3 Toggled .....................................................................................................................................................43
4.4.4 A/B transient operations.........................................................................................................................44

IT8700 User Manual
Copyright © Itech Electronic Co., Ltd. vii
4.5 LIST OPERATION ......................................................................................................................................................45
4.6 TRIGGERED OPERATION.............................................................................................................................................48
4.6.1 Trigger function........................................................................................................................................48
4.6.2 Trigger source..........................................................................................................................................48
4.7 SHORT OPERATION...................................................................................................................................................48
4.8 INPUT ON/OFF OPERATION ........................................................................................................................................49
4.9 SYNCHRONOUS LOAD ...............................................................................................................................................49
4.10 VON OPERATION ...................................................................................................................................................49
4.11 PROTECTION FUNCTIONS.........................................................................................................................................51
4.11.1 Over voltage protection (OVP)............................................................................................................51
4.11.2 Over current protection (OCP) ............................................................................................................51
4.11.3 Over power protection (OPP)..............................................................................................................52
4.11.4 Over temperature protection (OTP)....................................................................................................52
4.11.5 Reverse voltage alarm (LRV) ..............................................................................................................52
4.12 SAVE AND RECALL OPERATION ..................................................................................................................................52
4.13 AUTOMATIC TEST FUNCTION ....................................................................................................................................53
4.14 CR-LED TEST FUNCTION ........................................................................................................................................56
CHAPTER5 SPECIFICATIONS............................................................................................................................ 59
5.1 MAIN TECHNICAL PARAMETERS ..................................................................................................................................59
5.2 SUPPLEMENTARY CHARACTERISTICS.............................................................................................................................76
CHAPTER6 REMOTE OPERATION .................................................................................................................... 77
6.1 RS232 INTERFACE ...................................................................................................................................................77
6.2 ETHER NET INTERFACE..............................................................................................................................................79
6.3 GPIB INTERFACE(ONLY FOR IT8700(G) SERIES)............................................................................................................79
6.4 USB INTERFACE ......................................................................................................................................................79
APPENDIX............................................................................................................................................................. 80
SPECIFICATIONS OF RED AND BLACK TEST LINES ..................................................................................................................80

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 1
Chapter1 Inspection and Installation
This chapter mainly explains to the user how to do the inspection after receiving
the package, and introduces the installation size and steps for the mainframe
and modules.
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:
Item
Qty
.
Model
Remarks
Electronic Load
x1
IT8700 series
The IT8700 series include:
IT8722/IT8723/IT8731/IT8732/IT8733/
IT8722B/IT8732B/IT8733B/IT8722P/I
T8723P/IT8731P/IT8732P/IT8733P/IT
8722BP/IT8732BP/IT8733BP/IT8702/I
T8703/IT8701P/IT8702P/IT8703P
Power cord
x1
IT-E171/IT-E172
/
IT-E173/IT-E174
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.
USB
x1
-
-
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.
1.2 Installation 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.

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 2
IT8701P Mainframe size
Detailed Dimension Drawing

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 3
IT8702 Mainframe size
Detailed Dimension Drawing

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 4
IT8703 Mainframe size
Detailed Dimension Drawing

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 5
IT8702P Mainframe size
Detailed Dimension Drawing

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 6
IT8722/IT8723/IT8722B Module
Detailed Dimension Drawing

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 7
IT8731/IT8732/IT8733/IT8732B/IT8733B Module
Detailed Dimension Drawing

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 8
1.3 Module installation
Two load modules can be installed into IT8701P mainframe, and four load
modules can be installed into IT8702/IT8702P mainframe. If the modules
installed all have double channels, the load will have eight channels at
maximum. Load modules can be installed at any sequence into the mainframe.
IT8703/IT8703P extended frame can also contain four load modules. The
installation steps of extended frame are the same as single mainframe, which
just need screwdriver.
Installation steps:
1. Turn off the power switch and disconnect the 110V/220V power cord.
IT8722P/IT8723P/IT8731P/IT8732P/IT8733P/IT8722BP/IT8732BP/IT8733BP Module
Detailed Dimension Drawing

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 9
2. Take off any packing materials around the mainframe.
3. Push the module into the slot(as shown in figure 1-1).
4. Fix the module with a screwdriver, the position of the screw is in the upside
and backside of the machine frame.
5. Install other modules one by one
Figure 1-1 module installation
NOTE
Franklinism will damage the module. Please install the module according to standard
electrostatic prevention operation style. Avoid touching the circuit board and connectors.
1.3.1 Channel number
To IT8700, the channel number for all modules is determined by the location of
the modules in relation to right side of the mainframe. To IT8702 mainframe, the
total channel number is 8. The 1st & 2nd channel are always next to the right
mainframe while 7, 8 channels are always next to the left side. Load channel
number is fixed even if the location isn’t occupied. Load module could have one
or two channels. The channel number of single channel model from right to left
according to the slot position should be: 1th channel, 3th channel, 5th channel….
For module with dual channels, such as IT8722, the channel number should be:
1th and 2th channels, 3th and 4th channels, 5th and 6th channels… The figure
below displays the rule of the module channel number. IT8701P/IT8702P
mainframe and IT8703/IT8703P extended mainframe can be understood in the
same way.
Fig 1-2 channel number distribution
For example：If IT8702 mainframe contains two single channel modules IT8731
Module
Mainframe

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 10
and two double channels modules IT8722, channel number is automatically
assigned to every channel at the sequence from right to left: 1,3,5,6,7,8. Now
channel number 2,4 aren’t occupied. IT8722 is double channels module. If the
installation location of two IT8722 modules is close to the left of the mainframe,
the channel number is 5,6,7,8 in sequence.
⚫Modules including single channel modules: IT8731, IT8732, IT8732B,
IT8733, IT8733B and double channel modules: IT8722, IT8723, IT8722B
can be installed into IT8702 mainframe or IT8703 extended frame
according to your need.
⚫Modules including single channel modules: IT8731P, IT8732P, IT8732BP,
IT8733P, IT8733BP and double channel modules: IT8722P, IT8723P,
IT8722BP can be installed into IT8701P, IT8702P mainframe or IT8703P
extended frame according to your need.
Fig1-3 channel number order while installing 4 single-channel unit
1.4 Mainframe installation
The operating temperature of IT8700 series electronic load is 0 to 40℃. A fan
cools the electronic load by drawing air through the top and sides and
exhausting it out by the rear side. 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. Minimum clearances for bench operation are 3cm on
the top. If there are radiator fan in your cabinet, please avoid installing the load
near the fan for cabinet fan because it will limit air circulation of load. If you are
installing equipment on top of your electronic load in the cabinet, use a filler
panel above the unit to ensure adequate for air circulation.
IT8702/IT8703/IT8702P/IT8703P has no accessory, each of them can be
installed directly on the 19-inch support through screw holes of the left ear.
NOTE
Do not block the fan exhaust at the rear of the Load. When the load uses on the desk, make
sure there enough space on the bottom of the equipment for air circulation.
1.5 Connecting the Power Cord
Connect the power cord after checking that the power switch of the instrument
is turned OFF.
AC power input level
IT8700 series electronic load support 110V/220V AC input. Please pay
attention to the AC level setup before provide AC power. (The AC line switch is
located at the rear of the unit.)

Inspection and Installation
Copyright © Itech Electronic Co., Ltd. 11
⚫Option Opt.1: 220V ±10% 50Hz/60Hz
⚫Option Opt.2: 110V ±10% 50Hz/60Hz
Input voltage selection
The load can work under 110/220V±10%AC input, as the label shown on the
rear（refer to figure 1-4）. If the default value on the label doesn’t match your
region’s, please switch the black key to choose input line voltage, and then
insert power cord. Choose the right linear voltage as following.
NOTE
There’s no need to change fuse when linear voltage changes. The fuse can protect the
electronic load at any setting voltage specified.
Figure 1-4 power switching keys
Types of power cord
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
Figure 1-5 types of power cord
Connecting AC Input
Connect standard power cord to the power supply input terminal.
电源转换开关电源转换开关
放大图
电源转换开关电源转换开关
放大图
110V110V110V110V110V110V110V
220V220V220V220V220V220V220V
Power switch