I-Tech IT9121 Series User manual

IT9121 Power Meter
Installation Instruction
Model: IT9121
Version: V1.4

Notices
© Itech Electronic, Co., Ltd. 2017
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
IT9121-402147
Revision
1st Edition: June 22, 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.

IT9121 Installation Instruction
Copyright © Itech Electronics Co., Ltd. i
Quality Certification and Assurance
We certify that IT9121 power meter 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)
Alternating current
OFF (power)
Both direct and alternating current
Power-on state
Protective earth (ground) terminal
Power-off state
Earth (ground) terminal
Reference terminal
Caution
Positive terminal
Warning (refer to this manual for
specific Warning or Caution
information)
Negative terminal
A chassis terminal
-
-

IT9121 Installation Instruction
Copyright © Itech Electronics 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 or is not applied with sufficient plastics. Do
not operate the instrument in the presence of inflammable gasses, vapors
or dusts.
The maximum operating voltage and current of the instrument are 600V
and 20Arespectively. Exceeding these limits will lead to burnout of the
instrument.
Make sure to use the power cord supplied by ITECH.
Check all marks on the instrument before connecting the instrument to
power supply.
Turn off the instrument and the operation system before connecting to the
I/O terminal.
Do not use the instrument if the detachable cover is removed or loosen.
Do not connect the instrument to any cable or terminal block before
self-testing.
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.
Environmental Conditions
Requirements
Operating temperature
5°C-40°C
Operating humidity
20%-80% (non-condensation)
Storage temperature
-20°C-50 °C
Altitude
Operating up to 2,000 meters
Installation category
II

IT9121 Installation Instruction
Copyright © Itech Electronics Co., Ltd. iii
Pollution degree
Pollution degree 2
NOTE
To make accurate measurements, allow the instrument to warm up for 30 min.
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 affix 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
substan
ces are expected to leak or
deteriorate during normal use. The
expected useful 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 Equiment (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 1 of the WEEE Directive, this instrument is classified as
a “Monitoring and Control Instrument”.
To return this unwanted instrument, contact your nearest
ITECH office.

IT9121 Installation Instruction
Copyright © Itech Electronics Co., Ltd. iv
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

IT9121 Installation Instruction
Copyright © Itech Electronics Co., Ltd. v
Content
Quality Certification and Assurance ...................................................................................................................... 1
Warranty............................................................................................................................................................... 1
Limitation of Warranty .......................................................................................................................................... 1
Safety Symbols...................................................................................................................................................... 1
Safety Precautions ................................................................................................................................................ 2
Environmental Conditions ..................................................................................................................................... 2
Regulatory Markings ............................................................................................................................................. 3
Waste Electrical and Electronic Equiment (WEEE) Directive................................................................................... 3
Compliance Information ....................................................................................................................................... 4
Chapter1 Introduction ..................................................................................................................................... 1
1.1 Document Information.................................................................................................................................... 1
1.2 Product Profile ................................................................................................................................................ 1
1.3 Verifying the Shipment.................................................................................................................................... 1
Chapter2 Installing the Instrument.................................................................................................................. 3
2.1 Adjusting the Handle....................................................................................................................................... 3
2.2 Removing the Handle ...................................................................................................................................... 4
2.3 Rack Mounting ................................................................................................................................................ 5
2.4 Connecting the Power Cord............................................................................................................................. 5
Chapter3 Inspecting the Instrument................................................................................................................ 6
3.1 Keys on the Front Pannel................................................................................................................................. 6
3.2 Rear Panel ....................................................................................................................................................... 6
3.3 Power-on Self-Test ........................................................................................................................................... 7
3.4 Zero Calibration............................................................................................................................................... 9
3.5 Replacing the Fuse .......................................................................................................................................... 9
Chapter4 Wiring the Circuit under Measurement ......................................................................................... 11
4.1 Precautions when Wiring the Circuit ............................................................................................................. 11
4.2 Selection of measurement method ............................................................................................................... 12
4.3 Wiring the Circuit under Measurement for Direct Input ................................................................................ 12
4.4 Wiring the Circuit under Measurement When Using Current Sensors............................................................ 14
4.5 Wiring the Measurement Circuit with VT/CT ................................................................................................. 17
4.6 Instructions of IT-E185 Fixture....................................................................................................................... 19
Appendix ................................................................................................................................................................ 20
Specifications of Red and Black Test Lines ........................................................................................................... 20

Introduction
Copyright © Itech Electronics Co., Ltd. 1
Chapter1 Introduction
1.1 Document Information
Installation Instructions are included in the supporting documentations of the
instrument which can be accessed via the CD supplied with the instrument or
ITECH official website.
Manual Title
Description
IT9121 Installation
Instruction (this
manual)
Explain how to inspect, install and connect the
instrument.
IT9121 User Manual
Explain how to conduct measurements through front
panel operations.
IT9121
Programming Guide
Introduce the communication protocol and reference
commands applicable to remote operation.
1.2 Product Profile
IT9121 Power Meter is a precision power analyzer characterized by powerful
and diversified features. It is designed for clearly and correctly measuring the
power and energy consumption of various electrical appliances. The maximum
input voltage and current of the instrument are 600Vrms and 20Arms; the
measuring bandwidth is 100KHZ; and the measurement accuracy is 0.1%. It
can meet user’s various measurement demands.
By virtue of its DSP+FPGA dual-core processing architecture, IT9121 Power
Meter can rapidly and accurately calculate harmonic parameters of signals. In
addition, it is equipped with USB, GPIB, RS232 and LAN communication
interfaces to accommodate user’s different requirements on communication.
Moreover, a USB peripheral component interface is provided for user to store
measurement parameters in an external storage medium.
Refer to IT9121 User’s Manual for details of general specifications and
technical specifications.
1.3 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:
Table 1-1 Checklist of Package Contents
Item
Qty.
Model
Remarks
IT9121 Power Meter
x1
IT9121
-
Power cord
x1 IT-E171/IT-E172
/IT-E173/IT-E17
4
User may select an appropriate
power cord that matches the
specifications of power socket
used in the area. Refer to the
Section 2.4 Connecting the Power
Cord for details of such
specifications.

Introduction
Copyright © Itech Electronics Co., Ltd. 2
USB cable x1
-
-
CD
x1
-
It contains IT9121 Power Meter
Installation Instructions, User’s
Manual, Programming and Syntax
Guide and other user
documentations.
Product Recycling
Notices
x1
-
It presents notices on recycling of
the instrument.
Packing List
x1
-
It lists all the package contents.
Ex-factory Test
Report
x1
-
It is the test report of the instrument
before delivery.
Test leads
x1
IT-E301-30A,
IT-E301-10A
IT-E301-30A
（
Both are Y type
terminals）
IT-E301-10A（banana plug –Y type
terminal）
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. Refer to IT9121 User’s Manual for detailed
requirements on returns.
IT9121 AC Power Meter is supplied with the following optional accessories
(sold separately):
Item
Model
Remarks
Rack mount kit
IT-E151/IT-E151A
To mount the instrument on a special
rack, user may select this optional.
Test fixture box
IT-E185
Use IT-E185 fixture in AC input power
consumption of AC-DC adapter
. Refer to
the Section 4.6 Instructions of IT-E185
Fixture for details of installation.
Current sensor
IT-E190
-

Installing the Instrument
Copyright © Itech Electronics Co., Ltd. 3
Chapter2 Installing the Instrument
IT9120 Power Meter can be either placed directly on a desktop or mounted on
the rack supplied as an optional accessory.
2.1 Adjusting the Handle
The instrument is equipped with a handle for user to easily carry and place it.
The handle can be adjusted in three manners as shown in the figure below. To
adjust the handle, first pull out the handle gently toward the left and right sides
of the instrument, and then rotate it slowly to its alignment keys.
Horizontal Position
Place the instrument horizontally on a desktop.
Adjusting the Position
1. Pull out the handle to a rotatable state, as shown below.
2. Rotate the handle to the desired position, as shown below.

Installing the Instrument
Copyright © Itech Electronics Co., Ltd. 4
3. Place the instrument on a desktop, as shown below.
2.2 Removing the Handle
To mount the instrument on a rack, first remove the handle from the instrument.
The handle can be removed following the procedures below:
1. Pull out the handle toward the left and rights sides and it can be rotated.
2. Rotate the handle to the position as shown in the following figure.
3. Pull out the handle toward the left and rights sides of the instrument from
the alignment hole.

Installing the Instrument
Copyright © Itech Electronics Co., Ltd. 5
NOTE
The handle can be easily removed from the alignment hole and key between the handle and
the instrument. When mounting or removing the handle, do not squeeze it too hard and mind
your hand.
2.3 Rack Mounting
IT9121 Power Meter can be mounted on a standard 19” rack. ITECH provides
user with IT-E151/IT-E151A rack, an optional mount kit.
2.4 Connecting the Power Cord
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. A
summary of connection procedures is given below.
Select from the flowing 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.
E
N
L
E
L N
E
N L
E
L N
China
IT-E171
United States &
Canada
IT-E172
Europe
IT-E173
England
IT-E174

Inspecting the Instrument
Copyright © Itech Electronics Co., Ltd. 6
Chapter3 Inspecting the Instrument
This chapter presents you an overview of the front and rear panels and the
power-own checkups that are necessary to ensure the instrument starts and
functions properly under the initial conditions.
3.1 Keys on the Front Pannel
The schematic diagram of front panel and key functions of IT9121 is shown
below:
1 USB PCI
2 Display
3 Menu key
4 Waveform Display key
5 Function key
6 Harmonics key
7 Integrator key
8 Setting Knob
9 Arrow keys
10 Enter key
11 Hold/ESC key
12 Set key
13 Image Save key
14 Menu key
15 Power switch
3.2 Rear Panel
The schematic diagram of rear panel and key functions is shown below:
1 GP-IB interface
2 Ethernet port
3 USB port
4 RS232 interface
5 External sync signal interface
6 Power port
7 External sensor connector
8 Negative voltage input terminals
9 Positive voltage input terminals
10 Current input terminal protective
cover

Inspecting the Instrument
Copyright © Itech Electronics Co., Ltd. 7
Warning: The external sensor interface (as shown in Fig. 7 above) of IT
9121 power meter is installed with a protective jacket at ex-factory, which
should be correctly installed at all circumstances unless an external sensor
permitted by ITECH is used.
3.3 Power-on Self-Test
A power-on self-test is a process performed by the instrument to confirm that
the instrument purchased by user meets our delivery standards and can
function properly during normal use.
Before operation, make sure you’ve read carefully and understand all the
general safety precautions contained in the manual.
Before turning on the instrument, make sure the mains voltage matches
the supply voltage so as to prevent burnout of the instrument.
Always put the mains plug into the grounded socket. Never use an
ungrounded wiring board. Before operation, check if the instrument is
grounded properly.
To prevent burnout of the instrument, check the “+” and “-” symbols and
maximum voltage and current before connecting the power cord.
The process of power-on self-test is illustrated as follows:
1. Connect the power cord properly and then press Power to turn on the
instrument.
2. At power-on, the instrument model and version information are displayed.
3. When startup completes successfully, the screen displays the following

Inspecting the Instrument
Copyright © Itech Electronics Co., Ltd. 8
information:
4. Select Menu to access the System Configuration interface. Press SYSTEM
to access the SYSTEM INFO interface on which the product model, serial
number, computer software version and other information are displayed.
5. Select SELF TEST, and the System Self-Test interface will pop up.
Press START to start self-test of the system, including LCD, LED,
Display and RAM.
An “OK” symbol following each test item denotes the test result is

Inspecting the Instrument
Copyright © Itech Electronics Co., Ltd. 9
acceptable, while a “DONE” symbol denotes the test result is subject to
user’s self judgment, such as whether LED displays clearly or not.
Press KEY TEST to check whether keys function properly.
Press all the keys on the front panel; if the icon corresponding to a key
shows a black shade, it means the key functions properly.
3.4 Zero Calibration
Zero calibration is a feature used to create a state under which input signal is
adjusted to zero through the internal circuit; meanwhile, the electrical level is
set to zero.
NOTE
When the measurement range and input filer remain constant for long, the zero level will
change with the ambient environment conditions. In this case, zero calibration is
recommended.
To make accurate measurements, allow the instrument to warm up for at least 30 min before
zero calibration .In addition, make sure the ambient temperature is controlled within the
specified range.
The detailed procedures of zero calibration are shown as follows:
1. Connect the power cord properly and then press Power key to turn on the
instrument.
2. Select Menu to access the System Configuration interface.
3. Select CAL ZERO->START to start zero calibration.
Wait 1 min for the zero calibration until “Cal Zero is Completed” displays.
3.5 Replacing the Fuse
During normal use of the instrument, you need to replace a blown fuse where
necessary by following the procedures below:
1. First pull out the power cord, and then take out the fuse block from the
power cord jack with a small screwdriver, as shown below:

Inspecting the Instrument
Copyright © Itech Electronics Co., Ltd. 10
2. Have a visual inspection of the fuse to see whether it is burnt out; if yes,
replace it with another fuse of the same specification. T1.25A-250V fuse is
used for IT9121 Power Meter.
3. After replacement, mount the fuse block to the original position, as
illustrated below:

Wiring the Circuit under Measurement
Copyright © Itech Electronics Co., Ltd. 11
Chapter4 Wiring the Circuit under
Measurement
IT9121 Power Meter is an instrument used to measure electric energy factors
(including voltage, current and power) of various electrical appliances. This
chapter explains how to wire a typical circuit under measurement.
User may select to wire the circuit either for direct input or using current
sensors, depending on the amplitude of the measured voltage or current.
4.1 Precautions when Wiring the Circuit
To prevent electric shock, turn the circuit under measurement off before
connection.
Always put the mains plug into the grounded socket. Never use an
ungrounded wiring board. Before connecting the circuit, make sure the
electronic load is grounded properly.
Do not wire a current circuit to the voltage input terminal or a voltage circuit
to the current input terminal.
Strip the insulation covers of the measurement cables so that when they
are wired to the input terminals, the conductive parts (bare wires) do not
protrude from the terminals. Also, make sure to fasten the input terminal
screws securely so that cables do not come loose.
When connecting measurement cables to the voltage input terminals, only
connect measurement cables that have safety rubber terminals that cover
their conductive parts. Also, make sure to fasten the input terminal screws
securely so that cables do not come loose.
When connecting cables to the external current sensor input terminals,
only connect cables that have safety terminals that cover their conductive
parts. Also, make sure to fasten the input terminal screws securely so that
cables do not come loose.
When connecting a measurement cable from an external current sensor to
an external current sensor input connector, remove the cables connected
to the current input terminals.Also, when the voltage of the circuit under
measurement is being applied to the external current sensor input
terminals, do not touch the current input terminals. Doing so may impair the
measurement accuracy or cause personal injuries.
When using an external current sensor, make sure to use a sensor that
comes in a case. The conductive parts and case should be insulated, and
the sensor should have enough dielectric strength for the voltage of the
circuit under measurement.
Use measurement cables satisfying the rated conditions and with dielectric
strengths and current capacities that are appropriate for the voltage and
current being measured.
Example: when making measurements on a current of 20A, use copper
wires that have a conductive cross-sectional area of 4mm2or greater.

Wiring the Circuit under Measurement
Copyright © Itech Electronics Co., Ltd. 12
Attaching a measurement cable to the instrument may cause radio
interference in which case the user is required to take proper protective
measures.
4.2 Selection of measurement method
According to the size of measured voltage and current, select the method of
measurement from the following table. The details of the wiring method
instructions, please see the corresponding section.
Voltage
Current
≤600V >600V
≤20A
Direct input (See
section 4.3)
Current wiring: direct input
(See section 4.3)
Voltage wiring: VT method
(See section 4.5)
>20A
Current sensor
(See section 4.4)
VT/CT method (See section
4.5)
4.3 Wiring the Circuit under Measurement for Direct
Input Under the condition that the measured voltage and current are within the
measurement range, when the voltage is 600V or less and the current is 20Aor
less, you may measure the current and voltage of the circuit for direct input.
There are several patterns of terminal wiring positions shown in the following
figures for wiring the voltage input and current input terminals. Depending on
the terminal wiring positions, the effects of stray capacitance and the effects of
the measured voltage and current amplitudes may become large. To make
accurate measurements, refer to the factors below when wring the voltage input
and current input terminals.
Effects of stray capacitance
When you are measuring a single-phase device, you can minimize the
effects of stray capacitance on measurement accuracy by connecting the
instrument’s current input terminal to the side that is closest to the earth
potential of the power supply (SOURCE), as shown below:
Effects of the measured voltage and current amplitudes
When the measured current is relatively large, connect the voltage input
terminal to the side that is closest to the load. When the measured current

Wiring the Circuit under Measurement
Copyright © Itech Electronics Co., Ltd. 13
is relatively small, connect the current input terminal to the side that is
closest to the load.
When the measured current
is relatively large:
When the measured current is relatively
small:
Voltage input terminals
The terminals are safety banana jacks (female). Only insert a safety
terminal whose conductive parts are not exposed into a voltage input
terminal.
Current input terminals
The terminals are binding posts, and the screws are M6. Either wind a wire
around a screw or pass a crimped terminal through the screw axis, and
then tighten firmly with the terminal knob.
Connection Procedures
The procedures of wring the circuit when measuring relatively small current are
shown as follows:
1. Remove the protective cover over the current input terminals.
2. The current input and voltage input terminals on the rear panel are shown
as follows:
Protective Cover