YOKOGAWA WT310 User manual

User’s
Manual WT310/WT310HC/WT330
Digital Power Meter
Getting Started Guide
IM WT310-02EN
1st Edition

Product Registration
Thank you for purchasing YOKOGAWA products.
YOKOGAWA provides registered users with a variety of information and
services.
Please allow us to serve you best by completing the product registration
form accessible from our homepage.
http://tmi.yokogawa.com/
PIM 103-03E

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IM WT310-02EN
Thank you for purchasing the WT310, WT310HC, or WT330 Digital Power Meter (hereinafter, “WT310/
WT310HC/WT330” will refer to all of these products). The WT310/WT310HC/WT330 is a power
measurement instrument that can measure parameters such as voltage, current, and power.
This getting started guide primarily explains the handling precautions and basic operations of the
WT310/WT310HC/WT330. To ensure correct use, please read this manual thoroughly before
beginning operation.
Keep this manual in a safe place for quick reference in the event that a question arises.
This manual is one of three WT310/WT310HC/WT330 manuals. Please read all manuals.
Manual Title Manual No. Description
WT310/WT310HC/WT330 Digital
Power Meter User’s Manual
IM WT310-01EN The manual explains all the WT310/WT310HC/WT330
features, except for the communication interface
features, and how to use them.
WT310/WT310HC/WT330 Digital
Power Meter Getting Started Guide
IM WT310-02EN This guide. Provided as a printed manual. The manual
explains the handling precautions and basic operations
of the WT310/WT310HC/WT330 and provides an
overview of its features.
WT310/WT310HC/WT330 Digital
Power Meter Communication
Interface User’s Manual
IM WT310-17EN This manual explains the WT310/WT310HC/WT330
communication interface features and how to use them.
PDF files of all the manuals above are included in the accompanying CD.
Notes
• The contents of this manual are subject to change without prior notice as a result of continuing
improvements to the instrument’s performance and functionality. The figures given in this manual
may differ from those that actually appear on your screen.
•Every effort has been made in the preparation of this manual to ensure the accuracy of its
contents. However, should you have any questions or find any errors, please contact your nearest
YOKOGAWA dealer.
• Copying or reproducing all or any part of the contents of this manual without the permission of
YOKOGAWA is strictly prohibited.
• The TCP/IP software of this product and the documents concerning it have been developed/created
by YOKOGAWA based on the BSD Networking Software, Release 1 that has been licensed from
the Regents of the University of California.
Trademarks
• Microsoft, Internet Explorer, MS-DOS, Windows, Windows NT, Windows XP, Windows Vista, and
Windows 7 are either registered trademarks or trademarks of Microsoft Corporation in the United
States and/or other countries.
•Adobe and Acrobat are either registered trademarks or trademarks of Adobe Systems Incorporated.
• In this manual, the TM and ® symbols do not accompany their respective registered trademark or
trademark names.
• Other company and product names are registered trademarks or trademarks of their respective
holders.
Revisions
• January 2013 1st Edition
1st Edition: January 2013 (YMI)
All Rights Reserved, Copyright © 2013 Yokogawa Meters & Instruments Corporation

ii IM WT310-02EN
Checking the Contents of the Package
Unpack the box and check the contents before operating the instrument. If the wrong items have been
delivered, if items are missing, or if there is a problem with the appearance of the items, contact your
nearest YOKOGAWA dealer.
WT310/WT310HC/WT330
Check that the product that you received is what you ordered by referring to the model name and suffix
code given on the name plate on the left side panel.
The WT330 includes the WT332 and WT333.
WT310/WT310HC WT330 (Model: WT332/WT333)
Model Suffix Code Description
WT310 WT310 Digital Power Meter
One input element model
WT310HC WT310 Digital Power Meter
One input element/large current model
WT332 WT330 Digital Power Meter
Two input element model
WT333 WT330 Digital Power Meter
Three input element model
Power cord1-D UL/CSA Standard power cord (Part No.: A1006WD)
Maximum rated voltage: 125 V
-F VDE Standard power cord (Part No.: A1009WD)
Maximum rated voltage: 250 V
-Q BS Standard power cord (Part No.: A1054WD)
Maximum rated voltage: 250 V
-R AS Standard power cord (Part No.: A1024WD)
Maximum rated voltage: 250 V
-H GB Standard power cord (Part No.: A1064WD)
Maximum rated voltage: 250 V
-N NBR Standard power cord (Part No.: A1088WD)
Maximum rated voltage: 250 V
Communication interface -C1 GP-IB interface
(The instrument is equipped
with one of these.)
-C2 RS-232 interface
Options /C7 Ethernet Communication
/EX122.5 V/5 V/10 V external input
/EX2250 mV/100 mV/200 mV/500 mV/1 V/2 V external input
/G5 Harmonic measurement
/DA4 DA output (4CH); for the WT310 or WT310HC
/DA12 DA output (12CH); for the WT332 or WT333
1 Make sure that the attached power cord meets the designated standards of the country and area
that you are using it in.
2 A single instrument cannot have both the /EX1 and /EX2 options.
No. (Instrument number)
When contacting the dealer from which you purchased the instrument, please give them the instrument
number.

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IM WT310-02EN
Standard Accessories
The instrument is shipped with the following accessories. Make sure that all accessories are present
and undamaged.
D/A cable3
B9879SX
Current input protection
cover4
B8212BX
Current input protection
cover5
B8212FX
Rubber feet
A9088ZM
One set of manuals6
Safety terminal adapter set2
758931
UL/CSA Standard
A1006WD
VDE Standard
A1009WD
BS Standard
A1054WD
AS Standard
A1024WD
DFQR
Power cord (one cord that matches the suffix code is included)1
GB Standard
A1064WD
H
NBR Standard
A1088WD
N
1 Make sure that the attached power cord meets the designated standards of the country and area
that you are using it in.
2 Same number of sets as the number of installed input elements
WT310: One set with one hexagonal socket wrench
WT310HC: One set with one hexagonal socket wrench
WT332: Two sets with one hexagonal socket wrench
WT333: Three sets with one hexagonal socket wrench
3Included with models that have D/A output and remote control (/DA4 or /DA12)
4 For the WT310/WT310HC
5 For the WT332/WT333
6 For information on the types of printed manuals and manuals on the CD that are provided, see
page i.
Checking the Contents of the Package

iv IM WT310-02EN
CD-R
The CD-R contains the data listed below. To view the PDF user’s manuals, you need Adobe Reader 5.0
or later.
PDFs of the WT310/WT310HC/WT330 User’s Manuals
These manuals are in the Manuals folder.
English
• WT310/WT310HC/WT330 Digital Power Meter User’s Manual
IM WT310-01EN
• WT310/WT310HC/WT330 Digital Power Meter Getting Started Guide
IM WT310-02EN
• WT310/WT310HC/WT330 Digital Power Meter Communication Interface User’s Manual
IM WT310-17EN
Japanese
• WT310/WT310HC/WT330 Digital Power Meter User’s Manual
IM WT310-01JA
• WT310/WT310HC/WT330 Digital Power Meter Getting Started Guide
IM WT310-02JA
• WT310/WT310HC/WT330 Digital Power Meter Communication Interface User’s Manual
IM WT310-17JA
Installer for the WTViewerFreePlus Application Software (For the
WT310/WT310HC/WT330)
• WTViewerFreePlus_Installer.exe
• WTViewerFreePlus (folder)
• YKMUSB (folder)
PDF of the Manual for the WTViewerFreePlus Application Software
These manuals are in the Manuals folder.
English
• Application Software WTViewerFreePlus for WT310/WT310HC/WT330 User’s Manual
IM 760121-02E
Japanese
• Application Software WTViewerFreePlus for WT310/WT310HC/WT330 User’s Manual
IM 760121-02
WARNING
Never play this CD-R on an audio CD player. Doing so may cause loss of hearing or speaker
damage due to the large sounds that may be produced.
Checking the Contents of the Package

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IM WT310-02EN
Optional Accessories (Sold separately)
The following optional accessories are available for purchase separately.
For information about ordering accessories, contact your nearest YOKOGAWA dealer.
Item Model/ Min. Q’ty Note
Part No.
External sensor cable B9284LK 1 For connecting to the WT310/WT310HC/WT330’s
external current sensor input connector.
Length: 0.5 m.
Measurement lead 758917 1 Two leads in one set. Used with the 758922 or
758929 adapter (sold separately). Length: 0.75 m.
Rated voltage: 1000 V.*
Safety terminal adapter set 758923 1 Two pieces in one set. Rated voltage 600 V.*
758931 1 Two pieces in one set. Rated voltage 1000 V.*
Alligator clip adapter set 758922 1 Two pieces in one set. For use with measurement
lead 758917.
Rated voltage 300 V.*
758929 1 Two pieces in one set. For use with measurement
lead 758917.
Rated voltage 1000 V.*
Fork terminal adapter set 758921 1 Two pieces in one set. For use with measurement
lead 758917.
Rated voltage 1000 V.* Rated current: 25 A.
Conversion adapter 758924 1 BNC-4 mm socket adapter. Rated voltage: 500 V.*
* The actual voltage that can be used is the lowest voltage of the WT310/WT310HC/WT330 and
cable specifications.
Measurement
lead
758917
Alligator clip
adapter set
758922
Alligator clip
adapter set
758929
Fork terminal
adapter set
758921
Safety terminal
adapter set
758923
External sensor
cable
B9284LK
Safety terminal
adapter set
758931
Conversion adapter
758924
Checking the Contents of the Package

vi IM WT310-02EN
Safety Precautions
This instrument is an IEC safety class I instrument (provided with a terminal for protective earth
grounding).
The general safety precautions described herein must be observed during all phases of operation.
If the instrument is used in a manner not specified in this manual, the protection provided by the
instrument may be impaired. YOKOGAWA assumes no liability for the customer’s failure to comply
with these requirements.
The WT310/WT310HC/WT330 is a power measurement instrument that can measure parameters
such as voltage, current, and power. Do not use this instrument for anything other than its intended
purpose.
The following symbols are used on this instrument.
Warning: handle with care. Refer to the user’s manual or service manual. This symbol appears
on dangerous locations on the instrument which require special instructions for proper handling
or use. The same symbol appears in the corresponding place in the manual to identify those
instructions.
Electric shock, danger
Ground (earth) or functional ground terminal (do not use this terminal as a protective ground
terminal.)
Alternating current
Both direct and alternating current
ON (power)
OFF (power)
Power-on state
Power-off state

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Failure to comply with the precautions below could lead to injury
or death.
WARNING
Use the Instrument Only for Its Intended Purpose
The WT310/WT310HC/WT330 is a power measurement instrument that can measure
parameters such as voltage, current, and power. Do not use this instrument for anything other
than as a power measurement instrument.
Check the Physical Appearance
Do not use the instrument if there is a problem with its physical appearance.
Use the Correct Power Supply
Make sure that the power supply voltage matches the instrument’s rated supply voltage and
that it does not exceed the maximum voltage range specified for the power cord.
Use the Correct Power Cord and Plug
To prevent the possibility of electric shock or fire, be sure to use the power cord supplied by
YOKOGAWA. The main power plug must be plugged into an outlet with a protective earth
terminal. Do not invalidate this protection by using an extension cord without protective earth
grounding.
Additionally, do not use the power cord supplied with this instrument with another instrument.
Connect the Protective Grounding Terminal
Make sure to connect the protective earth to prevent electric shock before turning on the
power. The power cord that comes with the instrument is a three-prong type power cord.
Connect the power cord to a properly grounded three-prong outlet.
Do Not Impair the Protective Grounding
Never cut off the internal or external protective earth wire or disconnect the wiring of the
protective earth terminal. Doing so may result in electric shock or damage to the instrument.
Do Not Operate with Defective Protective Grounding or Fuses
Do not operate the instrument if the protective earth or fuse might be defective. Check the
grounding and the fuse before operating the instrument.
Do Not Operate in an Explosive Atmosphere
Do not operate the instrument in the presence of flammable gasses or vapors. Doing so is
extremely dangerous.
Do Not Remove Covers
Only qualified YOKOGAWA personnel should remove the instrument’s covers. The inside of
the instrument is dangerous because parts of it have high voltages.
Ground the Instrument before Making External Connections
Securely connect the protective grounding before connecting to the item under measurement
or to an external control unit. Before touching a circuit, turn off its power and check that it has
no voltage.
Measurement Category
This instrument is a measurement category II product. Do not use it for measurement category
III or IV measurements.
Install or Use the Instrument in Appropriate Locations
•Do not install or use the instrument outdoors or in locations subject to rain or water.
• Install the instrument so that you can immediately remove the power cord if an abnormal or
dangerous condition occurs.
Safety Precautions

viii IM WT310-02EN
Connect Cables Correctly
Power meters can measure large voltages and currents directly. If you use a voltage
transformer or a current transformer together with this power meter, you can measure even
larger voltages or currents. When you are measuring a large voltage or current, the power
capacity of the item under measurement becomes large. If you do not connect the cables
correctly, an overvoltage or overcurrent may be generated in the circuit under measurement.
This may lead to not only damage to the power meter and the item under measurement, but
electric shock and fire as well. Be careful when you connect the cables, and be sure to check
the following points.
Before you begin measuring (before you turn the item under measurement on), check that:
•Cables have been connected to the power meter’s input terminals correctly.
Check that there are no voltage measurement cables that have been connected to the
current input terminals.
Check that there are no current measurement cables that have been connected to the
voltage input terminals.
If you are measuring multiphase power, check that there are no mistakes in the phase
wiring.
• Cables have been connected to the power supply and the item under measurement
correctly.
Check that there are no short circuits between terminals or between connected cables.
•The cables are connected firmly to the current input terminals.
• There are no problems with the current input terminals and the crimping terminals, such as
the presence of foreign substances.
During measurement (never touch the terminals and the connected cables when the item
under measurement is on), check that:
•There no problems with the input terminals and the crimping terminals, such as the
presence of foreign substances.
• The input terminals are not abnormally hot.
• The cables are connected firmly to the input terminals.
The terminal connections may become loose over time. If this happens, heat may be
generated due to changes in contact resistance. If you are going to take measurements
using the same setup for a long time, periodically check that the cables are firmly
connected to the terminals. (Be sure to turn both the power meter and the item under
measurement off before you check the connections.)
After measuring (immediately after you turn the item under measurement off):
After you measure a large voltage or current, power may remain for some time in the item
under measurement even after you turn it off. This remaining power may lead to electric
shock, so do not touch the input terminals immediately after you turn the item under
measurement off. The amount of time that power remains in the item under measurement
varies depending on the item.
See below for operating environment limitations.
CAUTION
This is a class A instrument designed for an industrial environment. Operation of this product
in a residential area may cause radio interference in which case the user will be required to
correct the interference.
Safety Precautions

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Waste Electrical and Electronic Equipment
Waste Electrical and Electronic Equipment (WEEE), DIRECTIVE 2002/96/EC
(This directive is valid only in the EU.)
This product complies with the WEEE Directive (2002/96/EC) marking requirement. This
marking indicates that you must not discard this electrical/electronic product in domestic
household waste.
Product Category
With reference to the equipment types in the WEEE directive Annex I, this product is classified
as a “Monitoring and control instruments” product.
Do not dispose in domestic household waste. When disposing products in the EU, contact your
local Yokogawa Europe B. V. office.
New EU Battery Directive
New EU Battery Directive, DIRECTIVE 2006/66/EC
(This directive is valid only in the EU.)
Batteries are included in this product. This marking indicates they shall be sorted out and
collected as ordained in ANNEX II in DIRECTIVE 2006/66/EC.
Battery type: Lithium battery
You cannot replace batteries by yourself. When you need to replace batteries, contact your
local Yokogawa Europe B.V.office.

xIM WT310-02EN
Conventions Used in This Manual
Units
k: Denotes 1000. Example: 100 kS/s (sample rate)
K: Denotes 1024. Example: 720 KB (file size)
Notes
The notes and cautions in this manual are categorized using the following symbols.
Improper handling or use can lead to injury to the user or damage to the
instrument. This symbol appears on the instrument to indicate that the user must
refer to the user’s manual for special instructions. The same symbol appears in
the corresponding place in the user’s manual to identify those instructions. In the
user’s manual, the symbol is used in conjunction with the word “WARNING” or
“CAUTION.”
WARNING Calls attention to actions or conditions that could cause serious or fatal injury to
the user, and precautions that can be taken to prevent such occurrences.
CAUTION Calls attention to actions or conditions that could cause light injury to the user
or cause damage to the instrument or user’s data, and precautions that can be
taken to prevent such occurrences.
Note Calls attention to information that is important for the proper operation of the
software.
Characters That Appear on the 7-Segment LED
Because this instrument uses a 7-segment LED display, numbers, letters, and mathematical symbols
are displayed using special characters. For details, see section 1.3, “Digital Numbers and Characters.”

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Symbols and Conventions Used in Procedural Explanations
The contents of the procedural explanations are indicated using the following symbols.
This mark appears on the right side of the page to indicate features and settings that can be
operated and configured using the WTViewerFreePlus application software, which comes with the
instrument.
Procedure Operations are explained using flowcharts. See the example below for an
explanation of how various operations are indicated. All procedures are written
under the assumption that you are starting operation at the beginning of the
procedure, so you may not need to carry out all the steps in a procedure when
you are changing the settings.
Example: Operations for turning the storage feature on and off
6.
4.
2.
(DisplayC)
Configure the storage feature.
(Display B)
1.
3. 5.
Confirm
the setting.
Close menu.
The above flow chart indicates the following operations.
You can configure items that are blinking.
1. Press the SHIFT key so that it illuminates, and then press SETUP (UTILITY).
A menu appears in display B.
2. Use ▲or ▼to select StorE.
Pressing either key cycles through 9 menu items.
3. Press SET to confirm the selection of StorE.
The StorE function menu that you selected in step 2 appears in display C.
4. Use ▲or ▼to select oFF or on.
Pressing either key cycles through 3 menu items.
5. Press SET to confirm the selection of oFF.
The selected or set item is confirmed when you press SET.
A menu appears in display B.
6. Press HOLD (ESC) to return the menu display to the measurement data display.
• When you are making a number positive (no sign) or negative (–) or setting a number, when the
digit in the display that the input will be added to is blank, an underscore flashes at the position of
the digit.
• While you are performing menu operations, to leave the menu display, press HOLD (ESC). All
setting changes that you have confirmed by pressing the SET key will be reflected in the settings.
Explanation This section describes the setup items and the limitations regarding the
procedures. It may not give a detailed explanation of the feature. For a detailed
explanation of the feature, see chapter 1 in the User’s Manual, IM WT310-01EN.
Conventions Used in This Manual

xii IM WT310-02EN
Workflow
The figure below is provided to familiarize the first-time user with the workflow of WT310/WT310HC/
WT330 operation. For a description of an item, see the relevant section or chapter. In addition to
the sections and chapters that are referenced in the figure below, this manual also contains safety
precautions for handling and wiring the instrument. Be sure to observe the precautions.
Getting Started Guide
Section 2.2
Sections 2.3 and 2.4
Section 2.8
Sections 2.9 to 2.11
Installation and Circuit Wiring
Install the WT310/WT310HC/WT330.
Connect the power supply, and turn the power on.
Select the measurement method.
Wire the circuit under measurement.
Getting Started Guide
Sections 3.1 and 3.2
Section 3.3
Common Operations
Perform key operations.
Initialize settings.
User’s Manual
Chapter 2
Set the Measurement Conditions
Measurement conditions
User’s Manual
Section 4.1
Section 4.2
Section 4.3
Section 4.4
Section 4.5
Chapter 5
Chapter 6
Display Measured/Computed Results
Voltage, current, and active power
Apparent power, reactive power, and power factor
Phase angle and frequency
Peak value
Crest factor, etc.
Integrated power (watt hour)
Harmonic measurement
User’s Manual
Chapter 7
Section 8.4 and chapter 5 of the
Getting Started Guide
Communication Interface
User’s Manual
Acquire Data
Store data to internal memory.
Transmit data using D/A output (option).
Transmit data through the USB, GP-IB,
RS-232, or Ethernet interface.
Read the precautions in sections 2.5 and 2.7 thoroughly before connecting the wires.
Also, if necessary, assemble the input terminal adapter that connects to the voltage
input terminal (see section 2.6) before connecting the wires.

xiii
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2.2Attach to 2.3, 2.5, 2.9, and 5.1
1
2
3
4
5
6
7
App
Index
Contents
Checking the Contents of the Package.............................................................................................ii
Safety Precautions...........................................................................................................................vi
Waste Electrical and Electronic Equipment .....................................................................................ix
New EU Battery Directive ................................................................................................................ ix
Conventions Used in This Manual ....................................................................................................x
Workflow ......................................................................................................................................... xii
Chapter 1 Component Names and Functions
1.1 Front Panel, Rear Panel, and Top Panel.......................................................................... 1-1
1.2 Displayed Items................................................................................................................ 1-5
1.3 Digital Numbers and Characters ...................................................................................... 1-7
1.4 Keys ................................................................................................................................. 1-8
1.5 Auto Range, Overrange, and Error Indications During Measurement............................ 1-12
1.6 System Configuration ..................................................................................................... 1-14
Chapter 2 Making Preparations for Measurements
2.1 Handling Precautions ....................................................................................................... 2-1
2.2 Installing the Instrument ................................................................................................... 2-3
2.3 Connecting the Power Supply .......................................................................................... 2-6
2.4 Turning the Power Switch On and Off.............................................................................. 2-7
2.5 Precautions When Wiring the Circuit under Measurement .............................................. 2-9
2.6 Assembling the Adapters for the Voltage Input Terminals .............................................. 2-12
2.7 Wiring for Accurately Measuring a Single-phase Device................................................ 2-14
2.8 Guide for Selecting the Method Used to Measure the Power ........................................ 2-15
2.9 Wiring the Circuit under Measurement for Direct Input .................................................. 2-16
2.10 Wiring the Circuit under Measurement When Using Current Sensors ........................... 2-31
2.11 Wiring the Circuit under Measurement When Using a Voltage or Current Transformer. 2-38
2.12 Connecting to a PC via USB (Installing WTViewerFreePlus)......................................... 2-44
Chapter 3 Common Operations
3.1 Key Operation and Functions........................................................................................... 3-1
3.2 Entering Values ................................................................................................................ 3-3
3.3 Initializing the Settings...................................................................................................... 3-4
Chapter 4 Operating the WT310/WT310HC/WT330
4.1 Setting the Measurement Ranges.................................................................................... 4-1
4.2 Configuring the Wiring System Settings (Only on the WT330) ........................................ 4-4
4.3 Displaying the Voltage, Current, and Active Power on the WT310/WT310HC................. 4-5
4.4 Displaying Voltages, Currents, and Active Powers on the WT330 ................................... 4-6
Chapter 5 External I/0 (Option)
5.1 External I/O Connector Pin Arrangement and Pinout....................................................... 5-1
5.2 Controlling the WT310/WT310HC/WT330 Remotely ....................................................... 5-3
5.3 Producing D/A Output....................................................................................................... 5-4

xiv IM WT310-02EN
Chapter 6 Troubleshooting, Maintenance, and Inspection
6.1 Troubleshooting................................................................................................................ 6-1
6.2 Error Code Descriptions and Corrective Actions .............................................................. 6-2
6.3 Recommended Part Replacement ................................................................................... 6-3
6.4 Calibration and Adjustment .............................................................................................. 6-4
Chapter 7 Specifications
7.1 Input ................................................................................................................................. 7-1
7.2 Measurement Items.......................................................................................................... 7-4
7.3 Accuracy........................................................................................................................... 7-5
7.4 Functions.......................................................................................................................... 7-9
7.5 External Current Sensor Input (/EX1 and /EX2 options) ................................................ 7-14
7.6 D/A Output (/DA4, /DA12 Options) ................................................................................. 7-14
7.7 Remote Control Input/Output Signal (/DA4, /DA12 Options).......................................... 7-14
7.8 GP-IB Interface (Standard on -C1)................................................................................. 7-15
7.9 Serial (RS-232) Interface (Standard on -C2).................................................................. 7-15
7.10 USB PC Interface ........................................................................................................... 7-15
7.11 Ethernet Interface(/C7 Option) ....................................................................................... 7-15
7.12 Safety Terminal Adapter ................................................................................................. 7-16
7.13 General Specifications ................................................................................................... 7-17
7.14 External Dimensions ...................................................................................................... 7-19
Appendix
Appendix 1 How to Make Accurate Measurements ..............................................................App-1
Contents

1-1
IM WT310-02EN
Component Names and Functions
1
2
3
4
5
6
7
App
Index
1.1 Front Panel, Rear Panel, and Top Panel
WT310/WT310HC
Front Panel
Power switch
→ section 2.4
Handle
Used to carry the
WT310/WT310HC/WT330
→ section 2.1
7-segment LED
display
→ section 1.2
Function and unit indicators
→ section 1.2
Keys
→ section 1.4
Rear Panel
Power inlet
Power connection → section 2.3
GP-IB or RS-232 connector
Used to communicate with the WT310/WT310HC/WT330
through the GP-IB or RS-232 interface
→ Communication Interface User’s Manual
External I/O connector
For connecting D/A output and remote control cables
→ chapter 5
For connecting voltage measurement cables
→ sections 2.8 to 2.11
Voltage input terminals
Current input terminal
For connecting current measurement
cables → sections 2.8, 2.9, and 2.11
External current sensor input connector
For connecting cables from an external current sensor
→ section 2.10
Ethernet port
Used to connect the WT310/WT310HC/WT330 to a network
→ Communication Interface User’s Manual
USB port for PCs
Used to connect the WT310/WT310HC/WT330 to
a PC that has a USB port
→ Communication Interface User’s Manual
Chapter 1 Component Names and Functions

1-2 IM WT310-02EN
Top Panel
Vent holes → section 2.2
Inlet holes → section 2.2
(There are also inlet holes on the bottom panel.)
1.1 Front Panel, Rear Panel, and Top Panel

1-3
IM WT310-02EN
Component Names and Functions
1
2
3
4
5
6
7
App
Index
WT330
Front Panel
Function, unit, and element indicators
→ section 1.2
Keys
→ section 1.4
Power switch
→ section 2.4
Handle
Used to carry the WT310/WT310HC/WT330
→ section 2.1
7-segment LED
display
→ section 1.2
Rear Panel
Power inlet
Power connection → section 2.3
GP-IB or RS-232 connector
Used to communicate with the WT310/WT310HC/WT330
through the GP-IB or RS-232 interface
→ Communication Interface User’s Manual
External I/O connector
For connecting D/A output and remote
control cables
→ chapter 5
For connecting voltage measurement cables
→ sections 2.8 to 2.11
Voltage input terminals
Current input terminal
For connecting current measurement cables
→ sections 2.8, 2.9, and 2.11
External current sensor input
connector
For connecting cables from an
external current sensor
→ section 2.10 Ethernet port
Used to connect the WT310/WT310HC/WT330
to a network
→ Communication Interface User’s Manual
USB port for PCs
Used to connect the WT310/WT310HC/WT330 to a PC
that has a USB port
→ Communication Interface User’s Manual
1.1 Front Panel, Rear Panel, and Top Panel

1-4 IM WT310-02EN
Top Panel
Vent holes → section 2.2
Inlet holes → section 2.2
(There are also inlet holes on the bottom panel.)
1.1 Front Panel, Rear Panel, and Top Panel