I-Tech IT8600 Series User manual

Programmable AC/DC
Electronic Load
Programming Guide for IT8600
Series
Model: IT8615/IT8615L/IT8616/IT8617
/IT8624/IT8625/IT8626/IT8627/IT8628
Version: V2.1
Via Acquanera, 29 22100 Como
tel. 031.526.566 (r.a.) fax 031.507.984
[e-mail] www.calpower.it

Notices
© ItechElectronic, Co., Ltd. 2015
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
IT8600-402266
Revision
2nd Edition: February 13, 2017
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
U.S. Government Restricted Rights.
Software and technical data rights
granted to the federal government
include only those rights customarily
provided to end user customers.
ITECH provides this customary
commercial license in software and
technical data pursuant to FAR
12.211 (Technical Data) and
12.212 (Computer Software) and,
for the Department of Defense,
DFARS 252.227-7015 (Technical
Data – Commercial Items) and
DFARS 227.7202-3 (Rights in
Commercial Computer Software or
Computer Software
Documentation).
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.

IT8600 Programming Guide
Copyright © Itech Electronic Co., Ltd. i
Quality Certification and Assurance
We certify that series IT8600 electronic load meets all the published
specifications.
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 if the product is:
Damaged resulting from customer-wired circuits or customer-supplied parts or
accessories;
Modified or repaired by customer without authorization;
Damaged resulting from customer-wired circuits or use in an environment not
designated by us;
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
-
-

IT8600 Programming Guide
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 IT8600 electronic load supports 110V/220VAC input and no need to
switch.
Do not use the instrument if it is damaged. Before operation, check the
casing to see whether it cracks. Do not operate the instrument in the
presence of inflammable gasses, vapors or dusts.
The electronic load is provided with a three-core power line during delivery
and should be connected to a three-core junction box. Before operation, be
sure that the electronic load is well grounded.
Make sure to use the power cord supplied by ITECH.
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 of electronic load without overheating. If
there are multiple loads, each pair of the load power cord must be carry out
the full rated short-circuit output current of the power securely.
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 loose.
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.
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.

IT8600 Programming Guide
Copyright © Itech Electronic Co., Ltd. iii
Environmental Conditions
Requirements
Operating temperature
5°C-40°C
Operating humidity
humidity 20%-80% (non-condensation)
Storage temperature
-20°C-50 °C
Altitude
≤2,000m
Installation category
II
Pollution degree
Pollution degree 2
NOTE
To make accurate measurements, allow the instrument to warm up for 30 min.

IT8600 Programming Guide
Copyright © Itech Electronic Co., Ltd. iv
Regulatory Marking
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 useful service 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
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.

IT8600 Programming Guide
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

IT8600 Programming Guide
Copyright © Itech Electronic Co., Ltd. vi
CONTENT
Quality Certification and Assurance............................................................................................................ 1
Warranty............................................................................................................................................................. 1
Limitation of Warranty..................................................................................................................................... 1
Safety Symbols................................................................................................................................................. 1
Safety Precautions........................................................................................................................................... 2
Environmental Conditions ............................................................................................................................. 2
Regulatory Marking ......................................................................................................................................... 4
Waste Electrical and Electronic Equipment (WEEE) Directive............................................................... 4
Compliance Information..................................................................................................................................... 5
Chapter1 Remote Control.......................................................................................................................... 1
1.1 Overview....................................................................................................................................................... 1
1.2 SCPI Command Introduction...................................................................................................................... 1
1.3 Command Type of SCPI ............................................................................................................................. 1
1.4 Command Format........................................................................................................................................ 4
1.5 Data Type..................................................................................................................................................... 6
1.6 Remote Operation....................................................................................................................................... 7
Chapter2 Measurement Commands......................................................................................................... 9
MEASure？......................................................................................................................................................... 9
FETCh？............................................................................................................................................................. 9
MEASure:CURRent?......................................................................................................................................... 9
FETCh:CURRent? ............................................................................................................................................. 9
MEASure:CURRent:RMS? ............................................................................................................................. 10
FETCh:CURRent:RMS?.................................................................................................................................. 10
MEASure:CURRent:MAXimum? .................................................................................................................... 10
FETCh:CURRent:MAXimum?......................................................................................................................... 10
MEASure:CURRent:CFACtor?....................................................................................................................... 10
FETCh:CURRent:CFACtor?............................................................................................................................ 10
MEASure:CURRent:MINPeak?...................................................................................................................... 11
FETCh:CURRent:MINPeak?........................................................................................................................... 11
MEASure:CURRent:MAXPeak?..................................................................................................................... 11
FETCh:CURRent:MAXPeak?......................................................................................................................... 11
MEASure:FREQuency?................................................................................................................................... 11
FETCh:FREQuency?....................................................................................................................................... 11
MEASure:POWer?........................................................................................................................................... 12
FETCh:POWer?............................................................................................................................................... 12
MEASure:POWer:MAXimum?........................................................................................................................ 12
FETCh:POWer:MAXimum?............................................................................................................................. 12
MEASure:POWer:APParent? ......................................................................................................................... 12
FETCh:POWer:APParent?.............................................................................................................................. 12
MEASure:POWer:PFACtor? ........................................................................................................................... 13
FETCh:POWer:PFACtor?................................................................................................................................ 13
MEASure:POWer:REACtive?......................................................................................................................... 13

IT8600 Programming Guide
Copyright © Itech Electronic Co., Ltd. vii
FETCh:POWer:REACtive?.............................................................................................................................. 13
MEASure:RESistance? ................................................................................................................................... 13
FETCh:RESistance?........................................................................................................................................ 13
MEASure:VOLTage?........................................................................................................................................ 14
FETCh:VOLTage?............................................................................................................................................ 14
MEASure:VOLTage:RMS?.............................................................................................................................. 14
FETCh:VOLTage:RMS? .................................................................................................................................. 14
MEASure:VOLTage:MAXimum?..................................................................................................................... 14
FETCh:VOLTage:MAXimum? ......................................................................................................................... 14
MEASure:VOLTage:THDistort?....................................................................................................................... 15
FETCh:VOLTage:THDistort?........................................................................................................................... 15
MEASure:ETIMe?............................................................................................................................................ 15
FETCh:ETIMe?................................................................................................................................................. 15
MEASure:TEMPerature?................................................................................................................................. 15
FETCh:TEMPerature?..................................................................................................................................... 15
MEASure:CURRent:AMPLitude:HOLD.......................................................................................................... 15
MEASure:HARMonic?..................................................................................................................................... 16
MEASure:VOLTage:HARMonic?.................................................................................................................... 16
MEASure:PHASe:HARMonic?........................................................................................................................ 17
MEASure:VOLTage:HARMonic:DISTort? ...................................................................................................... 17
FETCh:VOLTage:HARMonic?......................................................................................................................... 17
FETCh:PHASe:HARMonic?............................................................................................................................ 18
FETCh:VOLTage:HARMonic:DISTort?........................................................................................................... 18
FETCh:HARMonic? ......................................................................................................................................... 18
Chapter3 Load Commands...................................................................................................................... 20
INPut.................................................................................................................................................................. 20
INPut:REAL? ........................................................................................................................................................ 20
FUNCtion.......................................................................................................................................................... 20
INPut:SHORt .................................................................................................................................................... 21
INPut:SHORt:FUNCtion .................................................................................................................................. 21
[SOURce:]PROTection:CLEar........................................................................................................................ 22
P R OTe c tion:AUTO:CLEar...................................................................................................................................... 22
CURRent........................................................................................................................................................... 22
[SOURce:]CURRent:LIMit[:LEVel][:CV]......................................................................................................... 23
CURRent:PROTection..................................................................................................................................... 23
CURRent:PEAK:PROTection.......................................................................................................................... 24
CURRent:PROTection:DELay......................................................................................................................... 24
CURRent:PROTection:STATe......................................................................................................................... 25
POWer............................................................................................................................................................... 25
[SOURce:]POWer:MAXimum[:LEVel] ............................................................................................................ 26
POWer:PROTection......................................................................................................................................... 26
POWer:PROTection:DELay ............................................................................................................................ 27
POWer:PROTection:STATe............................................................................................................................. 27
RESistance....................................................................................................................................................... 28

IT8600 Programming Guide
Copyright © Itech Electronic Co., Ltd. viii
VOLTage ........................................................................................................................................................... 28
CFACtor ............................................................................................................................................................ 29
PFACtor............................................................................................................................................................. 29
INPut:TIMer....................................................................................................................................................... 30
INPut:TIMer:DELay.......................................................................................................................................... 30
MEASure:TYPE................................................................................................................................................ 31
RATE:DCCV ..................................................................................................................................................... 31
RATE:CC........................................................................................................................................................... 32
WAVE:TRIGger:VOLTage[:LEVel] .................................................................................................................. 32
WAVE:TRIGger:CURRent[:LEVel].................................................................................................................. 33
WAVE:TRIGger:SOURce................................................................................................................................ 33
WAVE:TRIGger:SLOPe................................................................................................................................... 33
WAVE:TRIGger:MODE.................................................................................................................................... 34
WAVE:TRIGger:DELay:TIME.......................................................................................................................... 34
WAVE:TRIGger:DIVTime................................................................................................................................. 35
WAVE:RUN....................................................................................................................................................... 35
WAVE:STOP..................................................................................................................................................... 36
WAVE:SINGle................................................................................................................................................... 36
WAVE:VOLTage:DATA?................................................................................................................................... 36
WAVE:CURRent:DATA? .................................................................................................................................. 37
WAVE:TRIGger？............................................................................................................................................. 37
WAVE:SCOPe:SELection................................................................................................................................ 37
WAVE:KNOB:SELection.................................................................................................................................. 38
WAVE:VOLTage:BASE.................................................................................................................................... 38
WAVE:VOLTage:RANGe................................................................................................................................. 38
WAVE:CURRent:BASE ................................................................................................................................... 39
WAVE:CURRent:RANGe ................................................................................................................................ 39
PORT:OUTPut.................................................................................................................................................. 40
AVERage:COUNt............................................................................................................................................. 40
Chapter4 System Commands ................................................................................................................. 41
SYSTem:MODE................................................................................................................................................ 41
SYSTem:CFPF:MODE..................................................................................................................................... 41
SYSTem:CFPF:PRIOrity.................................................................................................................................. 41
SYSTem:HARMonic:FORMula....................................................................................................................... 42
SYSTem:COMMunicate:GPIB:ADDRess ...................................................................................................... 42
SYSTem:COMMunicate:LAN:CURRent:ADDRess....................................................................................... 43
SYSTem:COMMunicate:LAN:CURRent:DGATeway..................................................................................... 43
SYSTem:COMMunicate:LAN:CURRent:SMASk........................................................................................... 44
SYSTem:COMMunicate:LAN:DHCP.............................................................................................................. 44
SYSTem:COMMunicate:LAN:SOCKetport.................................................................................................... 45
SYSTem:COMMunicate:LAN:MACaddress?................................................................................................. 45
SYSTem:BEEPer:IMMediate .......................................................................................................................... 46
SYSTem:BEEPer.............................................................................................................................................. 46
SYSTem:VERSion? ......................................................................................................................................... 46

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Copyright © Itech Electronic Co., Ltd. ix
SYSTem:ERRor?.............................................................................................................................................. 47
SYSTem:REMote............................................................................................................................................. 47
SYSTem:LOCal ................................................................................................................................................ 47
SYSTem:RWLock............................................................................................................................................. 48
SYSTem:BACKlight:BRIGhtness.................................................................................................................... 48
Chapter5 Status Commands................................................................................................................... 49
STATus:QUEStionable? .................................................................................................................................. 49
STATus:QUEStionable:CONDition?............................................................................................................... 49
STATus:QUEStionable:ENABle...................................................................................................................... 49
STATus:OPERation?........................................................................................................................................ 50
STATus:OPERation:CONDition?.................................................................................................................... 51
STATus:OPERation:ENABle........................................................................................................................... 51
Chapter6 Calibration Commands............................................................................................................ 53
CALibrate:SECure............................................................................................................................................ 53
CALibrate:INITital............................................................................................................................................. 53
CALibrate:SAVe................................................................................................................................................ 54
CALibrate:VOLTage:POINt.............................................................................................................................. 54
CALibrate:VOLTage......................................................................................................................................... 54
CALibrate:CURRent:POINt............................................................................................................................. 55
CALibrate:CURRent......................................................................................................................................... 55
CALibrate:VOLTage:METer:POINt.................................................................................................................. 55
CALibrate:VOLTage:METer............................................................................................................................. 56
CALibrate:CURRent:METer:POINt................................................................................................................. 56
CALIbrate:CURRent:METer............................................................................................................................ 56
CALibrate:RESistance:POINt ......................................................................................................................... 56
CALibrate:RESistance..................................................................................................................................... 57
CALibrate:RESistance:BIAS:POINt................................................................................................................ 57
CALibrate:RESistance:BIAS........................................................................................................................... 57
CALibrate:CURRent:LIMit:POINt.................................................................................................................... 58
CALibrate:CURRent:LIMit............................................................................................................................... 58
Chapter7 Common Commands............................................................................................................... 59
*CLS .................................................................................................................................................................. 59
*ESE.................................................................................................................................................................. 59
*ESR?................................................................................................................................................................ 60
*IDN?................................................................................................................................................................. 60
*OPC ................................................................................................................................................................. 60
*RST.................................................................................................................................................................. 61
*SRE.................................................................................................................................................................. 61
*STB .................................................................................................................................................................. 62
*SAV .................................................................................................................................................................. 62
*RCL.................................................................................................................................................................. 63
*TST？............................................................................................................................................................... 63
Appendix................................................................................................................................................. 64

IT8600 Programming Guide
Copyright © Itech Electronic Co., Ltd. x

Remote Control
Copyright © Itech Electronic Co., Ltd. 1
Chapter1 Remote Control
1.1 Overview
This chapter will provide following remote configuration introductions:
SCPI Command Introduction
Command type
Command format
Data format
Remote Operation
1.2 SCPI Command Introduction
SCPI is short for Standard Commands for Programmable Instruments which
defines a communication method of bus controller and instrument. It is based
on ASCII and supply for testing and measuring instruments. SCPI command is
based on hierarchical architecture which also known as tree system. In this
system, Relevant Command is returned to a common node or root, so that a
subsystem is formed.
A part of OUTPut subsystem is listed below:
OUTPut:
SYNC {OFF|0|ON|1}
SYNC:
MODE {NORMal|CARRier}
POLarity {NORMal|INVerted}
OUTPut is the root class keyword, SYNC is the second keyword, MODE and
POLarity are the third keyword. Colon(:) is used for separating the command
keyword and the next level keyword.
1.3 Command Type of SCPI
SCPI has two types of commands, common and subsystem.
Common commands generally are not related to specific operation but to
controlling overall.electronic load functions, such as reset, status, and
synchronization.All commoncommands consist of a three-letter mnemonic
preceded by an asterisk: *RST *IDN? *SRE 8.
Subsystem commands perform specific electronic load functions. They are
organized into an inverted tree structure with the "root" at the top. The
following figure shows a portion of a subsyste command tree, from which

Remote Control
Copyright © Itech Electronic Co., Ltd. 2
you access the commands located along the various paths.
Multiple commands in a message
Multiple SCPI commands can be combined and sent as a single
message with one message terminator. There are two important
considerations when sending several commands within a single
message:
Use a semicolon to separate commands within a message.
Head paths influence how the instrument interprets commands.
We consider the head path as a string which will be inserted in front of
every command of a message. As for the first command of a message,
the head path is a null string; for each subsequent command, the head
path is a string which is defined to form the current command until and
including the head of the last colon separator. A message with two
combined commands: CURR:LEV 3;PROT:STAT OFF
The example indicates the effect of semicolon and explains the concept
of head path. Since the head path is defined to be "CURR" after "curr: lev
3", the head of the second command, "curr", is deleted and the
instrument explains the second command as: CURR:PROT:STAT OFF
If "curr" is explicitly included in the second command, it is semantically
wrong. Since combining it with the head path will become
"CURR:CURR:PROT:STAT OFF", resulting in wrong command.
Movement in the subsystem
In order to combine commands from different subsystems, you need to
be able to reset the header path to a null string within a message. You do
this by beginning the command with a colon (:), which discards any
previous header path. For example, you could clear the output protection
and check the status of the Operation Condition register in one message
by using a root specifier as follows:
PROTection:CLEAr;:STATus:OPERation:CONDition?

Remote Control
Copyright © Itech Electronic Co., Ltd. 3
The following message shows how to combine commands from different
subsystems as well as within the same subsystem:
POWer:LEVel 200;PROTection 28; :CURRent:LEVel 3;PROTection:STATe ON
Note the use of the optional header LEVel to maintain the correct path
within the voltage and current subsystems, and the use of the root
specifier to move between subsystems.
Including Common Commands
You can combine common commands with subsystem commands in the
same message. Treat the common command as a message unit by
separating it with a semicolon (the message unit separator). Common
commands do not affect the header path; you may insert them anywhere
in the message.
VOLTage:TRIGgered 17.5;:INITialize;*TRG
OUTPut OFF;*RCL2;OUTPut ONIT872X-3X SCPI Communication protocol 17
Case sensitivity
Common commands and SCPI commands are not case sensitive. You
can use upper or lower, for example:
*RST = *rst
:DATA? = :data?
:SYSTem:PRESet = :system:preset
Long-form and short-form versions
A SCPI command word can be sent in its long-form or short-form version.
The command subsystem tables in Section 5 provide the in the
long-form version. However, the short-form version is indicated by upper
case characters. Examples:
:SYSTem:PRESet long-form
:SYST:PRES short form
:SYSTem:PRES long-form and short-form combination
Note that each command word must be in long-form or short-form, and
not something in between.
For example, :SYSTe:PRESe is illegal and will generate an error. The
command will not be executed.
Query Observe the following precautions with queries:
Set up the proper number of variables for the returned data. For example, if
you are reading back a measurement array, you must dimension the array

Remote Control
Copyright © Itech Electronic Co., Ltd. 4
according to the number of measurements that you have placed in the
measurement buffer.
Read back all the results of a query before sending another command to
the electronic load. Otherwise a Query Interrupted error will occur and the
unreturned data will be lost.
1.4 Command Format
Formats for command display are as follows:
[SOURce[1|2]:]VOLTage:UNIT {VPP|VRMS|DBM}
[SOURce[1|2]:]FREQuency:CENTer
{<frequency>|MINimum|MAXimum|DEFault}
Based on the command syntax, most commands (and certain Parameter) are
expressed in both upper and lower cases. Upper case refers to abbreviation of
commands. Shorter program line may send commands in abbreviated format.
Long-format commands may be sent to ensure better program readability.
For example, both formats of VOLT and VOLTAGE are acceptable in the above
syntax statements. Upper or lower case may be used. Therefore, formats of
VOLTAGE, volt and Volt are all acceptable. Other formats (such as VOL and
VOLTAG) are invalid and will cause errors.
Parameter options with given command strings are included in the brace
({ }). The brace is not sent along with command strings.
Vertical stripes (|) separate several parameter options with given command
strings. For example, {VPP|VRMS|DBM} indicates that you may assign
"APP", "VRMS" or "DBM" in the above commands. Vertical stripes are not
sent along with command strings.
Angle brackets (< >) in the second example indicates that a value must be
assigned to the parameter in the brace. For example, the parameter in the
angle bracket is <frequency> in the above syntax statements.Angle
brackets are not sent along with command strings. You must assign a
value (such as "FREQ:CENT 1000") to the parameter, unless you select
other options displayed in the syntax (such as "FREQ:CENT MIN").
Some syntax elements (such as nodes and Parameter) are included in
square brackets ([ ]). It indicates that these elements can be selected and
omitted.Angle brackets are not sent along with command strings. If no
value is assigned to the optional Parameter, the instrument will select a
default value. In the above examples, "SOURce[1|2]" indicates that you
may refer to source channel 1 by "SOURce" or "SOURce1" or "SOUR1" or
"SOUR". In addition, since the whole SOURce node is optional (in the
square bracket), you can refer to the channel 1 by omitting the whole
SOURce node. It is because the channel 1 is the default channel for
SOURce language node. On the other hand, if you want to refer to channel

Remote Control
Copyright © Itech Electronic Co., Ltd. 5
2, "SOURce2" or "SOUR2" must be used in the program line.
Colon (:) It is used to separate key words of a command with the key words in next level.
As shown below:
APPL:SIN 455E3,1.15,0.0
In this example,APPLy command assigns a sine wave with frequency of 455
KHz, amplitude of 1.15 V and DC offset of 0.0 V.
Semicolon (;) It is used to separate several commands in the same subsystem and can also
minimize typing. For example, to send the following command string:
TRIG:SOUR EXT; COUNT 10
has the same effect as sending the following two commands:
TRIG:SOUR EXT
TRIG:COUNT 10
Question mark (?)
You can insert question marks into a command to query current values of most
Parameter. For example, the following commands will trigger to set the count as
10:
TRIG:COUN 10
Then, you may query count value by sending the following command:
TRIG:COUN?
You may also query the allowable minimum or maximum count as follows:
TRIG:COUN?MIN
TRIG:COUN?MAX
Comma (,) If a command requires several Parameter, then a comma must be used to
separate adjacent Parameter.
Space You must use blank characters, [TAB] or [Space] to separate Parameter with
key words of commands.
Generic commands (*)
Execute functions like reset, self inspection and status operation. Generic
commands always start with a asterisk (*) and occupy 3 character sizes,
including one or more Parameter. Key words of a command and the first

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parameter are separated by a space. Semicolon (;) can separate several
commands as follows:
*RST; *CLS; *ESE 32; *OPC?
Command terminator
Command strings sent to the instrument must end with a <Newline> (<NL>)
character. IEEE-488 EOI (End or Identify) information can be used as <NL>
character to replace termination command string of <NL> character. It is
acceptable to place one <NL> after a <Enter>. Termination of command string
always resets current SCPI command path to root level.
NOTE
As for every SCPI message with one query sent to the instrument, the
instrument will use a <NL> or newline sign (EOI) to terminate response
of return. For example, if "DISP:TEXT?" is sent, <NL> will be placed
after the returned data string to terminate response. If an SCPI
message includes several queries separated by semicolon (such as
"DISP?;DISP:TEXT?"), <NL> will terminate response returned after
response to the last query. In all cases, the program must read <NL> in
response before another command is sent to the instrument, otherwise
errors will be caused.
1.5 Data Type
SCPI language defines several data types used for program message and
response messages.
Numerical parameter
Commands requiring numerical Parameter support the notations of all common
decimal notations, including optional signs, decimal points, scientific notation,
etc. Special values of numerical Parameter are also acceptable, such as MIN,
MAX and DEF. In addition, suffixes for engineering units can also be sent
together with numerical Parameter (including M, k, m or u). If the command
accepts only some specific values, the instrument will automatically round the
input Parameter to acceptable values. The following commands require
numerical Parameter of frequency value:
[SOURce[1|2]:]FREQuency:CENTer {<Frequency>|MINimum|MAXimum}
Discrete parameter
Discrete Parameter are used for settings with limited number of programming
values (such as IMMediate, EXTernal or BUS). They can use short and long
format like key words of commands. They may be expressed in both upper and
lower case. The query response always returns uppercase Parameter in short
format. The following commands require discrete Parameter in voltage unit:

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[SOURce[1|2]:]VOLTage:UNIT {VPP|VRMS|DBM}
Boolean parameter
Boolean Parameter refer to true or false binary conditions. In case of false
conditions, the instrument will accept "OFF" or "0". In case of true conditions,
the instrument will accept "ON" or "1". In query of Boolean settings, the
instrument will always return "0" or "1". Boolean Parameter are required by the
following commands:
DISPlay {OFF|0|ON|1}
ASCII string Parameter
String Parameter may actually include all ASCII character sets. Character
strings must start and end with paired quotation marks; and single quotation
marks or double quotation marks are both allowed. Quotation mark separators
may also act as one part of a string, they can be typed twice without any
character added between them. String parameter is used in the following
command:
DISPlay:TEXT <quoted string>
For example, the following commands display message of "WAITING..."
(without quotation marks) on the front panel of the instrument.
DISP:TEXT "WAITING..."
Single quotation marks may also be used to display the same message.
DISP:TEXT 'WAITING...'
1.6 Remote Operation
There are three types of communication interfaces available: USB, GPIB and
LAN. You can choose any one of them to communicate with a PC.
1.6.1 USB interface
Use cables with double USB interface to connect load and PC.All electronic
load functions are programmable over the USB.
The USB488 interface capabilities of the electronic load are described below:
The interface is 488.2 USB488 interface.
The interface accepts REN_CONTROL, GO_TO_LOCAL, and
LOCAL_LOCKOUT requests.
The interface accepts MsgID = TRIGGER USBTMC command message
and forwards TRIGGER requests to the function layer.
The USB488device capabilities of the electronic load are described below:
The device understands all mandatory SCPI commands.
The device is SR1 capable.

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The device is RL1 capable.
The device is DT1 capable.
When communicating with USB interface, the first you should set
communication interface as USB in the panel menu. The detailed steps are as
follows:
1. Press (Shift)+ to enter the menu.
2. Press and select SYST SET, then press , the .”P-MEM KEEP”
will display on the panel.At the same time, press and select COMM
RS232, then press .
3. Press and select USB, then press to confirm.
4. Press to exit the menu.
Note
When communicating with USB interface, only SCPI format communication protocol is
supported.
1.6.2 GPIB Interface
First connect GPIB port of load to GPIB card of PC with IEEE488 BUS. They
must be sufficient contact and tighten the screws.And then set address. The
address can be set from 0 to 31. Press [Menu] key to enter system menu,
press [COMM CONFIG]to find Communication interface. Select GPIB, and
then set the GPIB address, press [Enter] to confirm. The electronic load
operates from a GPIB address set from the front panel. The GPIB address is
stored in non-volatile memory.
1.6.3 LAN Interface
Press [Menu] on the front panel together to access the menu. Select [COMM
CONFIG] to enter communication configuration page. Select LAN by pressing
arrow keys and then configure Gateway, IP, Mask and Socket Port in the LAN
option. Use a cross network cable through LAN interface to connect PC.
I-setI-set
Enter
Enter
Enter
Esc