Hioki MR8740 User manual

MR8740
MR8741
Instruction Manual
MEMORY HiCORDER
EN
Oct. 2018 Revised edition 7
MR8740A982-07 18-10H

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Contents
Usage Index ...............................................................................1
Introduction.................................................................................2
Confirming Package Contents....................................................2
Safety Information ......................................................................3
Operating Precautions................................................................7
Chapter 1
Overview __________________________________ 15
1.1 Product Overview ..............................................................15
1.2 Names and Functions of Parts ..........................................16
1.3 Display ..............................................................................18
1.4 Screen Configuration ........................................................19
1.5 Basic Operations ...............................................................22
1.5.1 Mouse Operations ..................................................................22
1.5.2 Mouse Right-click Menu .........................................................23
1.5.3 Mouse Left-click Operations ...................................................29
1.5.4 Mouse Wheel Operations .......................................................31
1.5.5 Waveform Operations .............................................................32
1.5.6 Measurement Operations .......................................................33
1.5.7 File Operations .......................................................................34
Chapter 2
Measurement
Preparations _______________________________ 35
2.1 Install an input module ......................................................36
2.2 Connecting Cords .............................................................39
2.3 Recording Media Preparation ...........................................52
2.3.1 Storage Media (Inserting a USB Memory Stick) .....................52
2.3.2 Formatting Storage Media ......................................................53
2.4 Supplying Power ...............................................................54
2.4.1 Connecting the Power Cord ...................................................54
2.4.2 Turning the Power On and Off ................................................55
2.5 Setting the Clocks .............................................................56
2.6 Adjusting the Zero Position (Zero-Adjust) .........................57
2.7 Performing Calibration (When Mounting MR8990) ...........58
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Chapter 3
Measurement
Procedure _________________________________59
3.1 Ensuring Measurement Safety ......................................... 59
3.2 Measurement Workflow .................................................... 60
3.3 Pre-Measurement Inspection ............................................ 62
3.4 Setting Measurement Configuration ................................. 63
3.4.1 Measurement Function .......................................................... 63
3.4.2 Time Axis Range and Sampling Rate .................................... 65
3.4.3 Recording Length
(number of divisions) .............................................................. 68
3.4.4 Screen Layout ........................................................................ 70
3.5 Input Channel Setting .......................................................71
3.5.1 Channel Setting Workflow ...................................................... 72
3.5.2 Analog Channel ..................................................................... 74
3.5.3 Logic Channel ........................................................................ 77
3.5.4 Display Sheet ......................................................................... 78
3.6 Starting and Stopping Measurement ................................ 79
Chapter 4
Saving/Loading Data
& Managing Files ___________________________81
4.1 Data capable of Being Saved & Loaded ........................... 83
4.2 Saving Data ...................................................................... 85
4.2.1 Save Types and Workflow ..................................................... 85
4.2.2 Automatically Saving Waveforms .......................................... 86
4.2.3 Saving Data Selectively (SAVE) ............................................ 91
4.2.4 Saving Example (Saving for Memory Division) ...................... 94
4.2.5 Save Waveform Output Data to the Media ............................ 96
4.3 Loading Data .................................................................... 97
4.4 Managing Files ............................................................... 100
4.4.1 Saving .................................................................................. 101
4.4.2 Checking the Contents of a Folder
(Open a Folder) ................................................................... 103
4.4.3 Creating New Folders .......................................................... 103
4.4.4 Deleting Files & Folders ....................................................... 104
4.4.5 Sorting Files ......................................................................... 105
4.4.6 Renaming Files & Folders .................................................... 105
4.4.7 Copying a File Into a Specified Folder ................................. 106

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Chapter 5
Printing __________________________________ 107
5.1 Printing Type and Workflow ............................................108
5.2 Making Auto Print Settings ..............................................109
5.3 Send PRINT key .............................................................110
5.4 Set the print contents ......................................................111
5.5 Miscellaneous Printing Functions ...................................114
5.5.1 Screen Hard Copy ................................................................114
5.5.2 Report Print (A4 Size Print) ..................................................114
5.5.3 List Print ................................................................................115
5.5.4 Text Comment Printing .........................................................115
Chapter 6
Waveform Screen Monitoring and Analysis ____ 117
6.1 Reading Measurement Values (Using the A/B Cursors) .118
6.2 Specifying a Waveform Range (A/B Cursor) ..................122
6.3 Moving the Waveform Display
Position ...........................................................................123
6.3.1 About Display Position ..........................................................123
6.3.2 Scrolling the Measurement Waveform .................................123
6.3.3 Moving the Position ..............................................................124
6.4 Performing Waveform X-Y Synthesis .............................125
6.5 Magnifying and Compressing Waveforms ......................127
6.5.1 Magnifying and Compressing
Horizontal Axis (Time Axis) ..................................................127
6.5.2 Zoom Function (Magnifying a Section of the Horizontal Axis
(Time Axis)) ..........................................................................128
6.5.3 Magnifying and Compressing
Vertical Axis (Voltage Axis) ..................................................129
6.6 Monitoring Input Levels (Level Monitor) ..........................130
6.6.1 Level Monitor ........................................................................130
6.6.2 Numerical Value Monitoring (DMM Display) .........................131
6.7 Switching the Waveform Screen Display (Display Menu) 132
6.7.1 Showing Upper/Lower Limit On Waveform Screen ..............132
6.7.2 Showing Comments On Waveform Screen ..........................132
6.7.3 Switching the Waveform Display Width ................................133
6.7.4 Switching the Format (MR8741 Only) ..................................133
6.7.5 Changing the Monitor Values (MR8740 Only) ......................133
6.7.6 Switch the Displayed Sheet ..................................................133
6.8 Seeing Block Waveforms ................................................134
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Chapter 7
Utility Functions ___________________________135
7.1 Adding Comments ..........................................................136
7.1.1 Adding a Title Comment ...................................................... 136
7.1.2 Adding a Channel Comment ................................................ 137
7.1.3 Alphanumeric Input .............................................................. 139
7.2 Displaying Waveforms During Recording (Roll Mode) ... 143
7.3 Displaying New Waveforms Over Past Waveforms
(Overlay) ........................................................................ 144
7.4 Converting Input Values (Scaling Function) ................... 146
7.4.1 Scaling Setting Examples .................................................... 148
7.5 Variable Function (Setting the Waveform Display Freely) 153
7.6 Fine Adjustment of Input Values (Vernier Function) ....... 156
7.7 Inverting the Waveform (Invert Function) .......................157
7.8 Copying settings to other channels (calculation No.)
(Copy function) .............................................................. 158
7.9 Making Detailed Settings for Input Modules ................... 159
7.9.1 Making Settings for the Anti-Aliasing
Filter (A.A.F.) (8968 High Resolution Unit) .......................... 160
7.9.2 Probe Attenuation Selection ................................................ 160
7.9.3 Settings for the 8967 TEMP Unit ......................................... 161
7.9.4 Settings for the 8969 and U8969 Strain Unit ....................... 163
7.9.5 Settings for the 8970 Freq Unit ............................................ 164
7.9.6 Settings for the 8971 Current Unit ....................................... 167
7.9.7 Settings for the 8972 DC/RMS Unit ..................................... 168
7.9.8 Settings for the MR8990 Digital Voltmeter Unit ................... 169
7.9.9 Model U8974 High Voltage Unit Settings ............................. 171
7.9.10 MR8790 Waveform Generator Unit Settings ....................... 172
7.9.11 MR 8971 Pulse Generator Unit Settings .............................. 174
7.9.12 U8793 Arbitrary Waveform Generator Unit Settings ............ 176
7.10 Register the Waveform in the U8793 Arbitrary
Waveform Generator Unit ................................................. 179
7.11 Save the Waveforms Registered in the
Model U8793 in the Media .............................................. 183
7.12 Setting Output Waveform Parameters ............................ 183
Chapter 8
Trigger Settings ___________________________185
8.1 Setting Workflow ............................................................. 186
8.2 Setting the Trigger Mode ................................................ 187

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8.3 Triggering by Analog Signals ..........................................188
8.3.1 Analog Trigger Settings and Types ......................................188
8.4 Triggering by Logic Signals (Logic Trigger) ....................193
8.5 Trigger by Timer or Time Intervals
(Timer Trigger) ................................................................195
8.6 Synchronizing Between Blocks
(MR8740 Only) ................................................................198
8.7 Applying an External Trigger (MR8741 Only) .................199
8.8 Triggering Manually (Manual Trigger) .............................199
8.9 Pre-Trigger Settings ........................................................200
8.9.1 Setting the Trigger Start Point (Pre-Trigger) .........................200
8.9.2 Setting Trigger Acceptance
(Trigger Priority) ....................................................................202
8.10 Setting Trigger Timing .....................................................203
8.11 Setting Combining Logic (AND/OR) for
Multiple Trigger Sources .................................................204
8.12 Using trigger settings to search
measurement data ..........................................................205
Chapter 9
Numerical Calculation
Functions ________________________________ 207
9.1 Numerical Calculation Workflow .....................................208
9.2 Settings for Numerical Value Calculation ........................210
9.2.1 Displaying Numerical Calculation Results ............................213
9.3 Judging Calculation Results ............................................214
9.3.1 Display of Judgment Results and Signal Output ..................216
9.4 Saving Numerical Calculation Results ............................217
9.5 Numerical Calculation Type and Description ..................219
Chapter 10
Waveform Calculation
Functions ________________________________ 223
10.1 Waveform Calculation Workflow .....................................224
10.2 Settings for Waveform Calculation ..................................227
10.2.1 Displaying the waveform calculation results .........................228
10.2.2 Setting constants ..................................................................230
10.2.3 Changing the display method for calculated waveforms ......231
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10.3 Waveform Calculation Operators and Results ................ 233
Chapter 11
Memory Division
Function _________________________________237
11.1 Recording Settings .........................................................239
11.2 Display Settings .............................................................. 240
Chapter 12
FFT Function
_________________________________________ 243
12.1 Overview and Features ...................................................243
12.2 Operation Workflow ........................................................ 244
12.3 Setting FFT Analysis Conditions ..................................... 245
12.3.1 Selecting the FFT Function .................................................. 245
12.3.2 Selecting the Data Source for Analysis ................................ 246
12.3.3 Setting the Frequency Range and Number
of Analysis Points ................................................................ 247
12.3.4 Thinning Out and Calculating Data ...................................... 249
12.3.5 Setting the Window Function ............................................... 250
12.3.6 Setting Peak Values of Analysis Results ............................. 251
12.3.7 Averaging Waveforms .......................................................... 252
12.3.8 Emphasizing Analysis Results (phase spectra only) ........... 255
12.3.9 Analysis Mode Settings ........................................................ 256
12.3.10Setting the Display Range of the Vertical Axis (Scaling) ..... 260
12.3.11Setting and Changing Analysis Conditions on the
Waveform Screen ............................................................... 261
12.4 Selecting Channels .........................................................262
12.5 Setting Screen Displays .................................................. 263
12.5.1 Displaying running spectrums .............................................. 265
12.6 Saving Analysis Results ................................................. 268
12.7 Analysis with the Waveform Screen ............................... 269
12.7.1 Analyzing after Specifying an Analysis Starting Point .......... 269
12.8 FFT Analysis Modes ....................................................... 271
12.8.1 Analysis Modes and Display Examples ............................... 271
12.8.2 Analysis Mode Functions ..................................................... 289

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Chapter 13
Waveform Evaluation
Function
(MR8741 Only) ____________________________ 291
13.1 Waveform GO/NG Evaluation
(MEM, FFT Function) ......................................................291
13.2 Setting the Waveform Area .............................................294
13.3 Setting the Waveform Evaluation Mode ..........................296
13.4 Setting the GO/NG Stop Mode .......................................297
13.5 Creating the Evaluation Area ..........................................299
13.6 Editor Command Details .................................................300
Chapter 14
System Environment
Settings__________________________________ 305
Chapter 15
Connection to a
Computer ________________________________ 309
15.1 LAN Settings and Connection (Before Using
FTP/Internet Browser/Command Communications) .......310
15.1.1 Making LAN Settings at the Instrument ................................310
15.1.2 Connecting Instrument and PC With LAN Cable ..................314
15.2 Performing Remote Operations on the Instrument
(Use an Internet Browser) ...............................................316
15.2.1 Making HTTP Settings on the Instrument .............................316
15.2.2 Connecting to the Instrument With an Internet Browser .......317
15.2.3 Operating the Instrument With an Internet Browser .............318
15.3 Accessing the Files on the Instrument From a
Computer (Using FTP) ....................................................323
15.3.1 Making FTP Settings at the Instrument ................................324
15.3.2 Using FTP to Connect to the Instrument ..............................325
15.3.3 Using FTP for File Operations ..............................................326
15.4 Wave Viewer (Wv) ..........................................................327
15.5 Controlling the Instrument with Command
Communications (LAN) ...................................................328
15.5.1 Making Settings on the Instrument .......................................329
15.5.2 Communication Command Setting .......................................330
15.6 Operating the instrument remotely and acquiring data
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Appendix
Index
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by using Model 9333 LAN Communicator ...................... 332
Chapter 16
External Control
(MR8741 Only) ____________________________ 333
16.1 Connecting External Control Terminals (MR8741 Only) .334
16.2 External I/O (MR8741 Only) ........................................... 335
16.2.1 External Input (START/IN1) (STOP/IN2) (SAVE/IN3) .......... 335
16.2.2 External Output (GO/OUT1) (NG/OUT2) ............................. 336
16.2.3 External Sampling (SMPL) ................................................... 338
16.2.4 Trigger Output (TRIG OUT) ................................................. 339
16.2.5 External Trigger terminal (EXT.TRIG) .................................. 340
Chapter 17
Specifications _____________________________341
17.1 General Specifications ....................................................341
17.2 Measurement Functions ................................................. 343
17.2.1 Memory Function ................................................................. 343
17.2.2 Recorder Function ............................................................... 343
17.2.3 FFT Function ....................................................................... 343
17.3 Trigger Section ............................................................... 344
17.4 File Specifications ...........................................................345
17.5 Built-In Functions ............................................................ 346
17.6 Input Modules Specifications .......................................... 349
17.6.1 8966 Analog Unit ................................................................. 349
17.6.2 8967 TEMP Unit .................................................................. 350
17.6.3 8968 High Resolution Unit ................................................... 351
17.6.4 8969 Strain Unit / U8969 Strain Unit .................................... 352
17.6.5 8970 Freq Unit ..................................................................... 353
17.6.6 8971 Current Unit ................................................................ 355
17.6.7 8972 DC/RMS Unit .............................................................. 356
17.6.8 8973 Logic Unit .................................................................... 357
17.6.9 MR8990 Digital Voltmeter Unit ............................................. 358
17.6.10 U8974 High Voltage Unit .................................................... 359
17.6.11 U8793 Arbitrary Waveform Generator Unit ......................... 360
17.6.12 MR8790 Waveform Generator Unit .................................... 362
17.6.13 MR8791 Pulse Generator Unit ............................................ 363

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Chapter 18
Maintenance and
Service __________________________________ 365
18.1 Trouble Shooting .............................................................366
18.2 Initializing the Instrument ................................................368
18.2.1 Initializing System Settings (System Reset) .........................368
18.2.2 Initializing Waveform Data ....................................................368
18.3 Error Messages ...............................................................369
18.4 Self-Test (Self Diagnostics) ............................................372
18.4.1 ROM/RAM Check .................................................................372
18.4.2 Display Check .......................................................................373
18.4.3 System Configuration Check ................................................373
18.5 Updating the Instrument ..................................................374
18.6 Cleaning ..........................................................................376
18.7 Disposing of the Instrument (Lithium Battery Removal) ..377
Appendix________________________________ A 1
Appendix 1 Default Values for Major Settings............................... A 1
Appendix 2 Reference................................................................... A 2
Appendix 2.1 Waveform File Sizes ................................................. A 2
Appendix 2.2 Setting Configuration and Image Data File Sizes ...... A 5
Appendix 2.3 Timebase and Maximum Recordable Time ............... A 6
Appendix 2.4 Maximum record length and number of divisions
(Memory division function) ....................................... A 7
Appendix 2.5 Time Axis Range and Sampling Rate of MR8990
Digital Voltmeter Unit ................................................ A 8
Appendix 2.6 Scaling Method When Using Strain Gauges ............. A 9
Appendix 3 About Options........................................................... A 10
Appendix 3.1 Options .................................................................... A 10
Appendix 4 FFT Definitions ......................................................... A 13
Index ________________________________Index 1
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Appendix
Index

Contents
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Usage Index
1
Usage Index
1 Install & Connect
2 Make Instrument Settings
3 Measure
Install the instrument
Setting measurement configuration
Start recording
Analysis
Optionally save
5 Finish
Stop recording
4 Analyze and Save
Turn the power off
Catching Changes in Input Signals (p.185)
Applying a Manual Trigger (p.199)
Adding Comments (p.136)
Freely Setting the Waveform Display (p.71)
Converting Input Values (p.146)
Copying Settings to Other Channels (p.158)
Suppressing Noise (Low-pass filter) (p.76)
Composing X-Y Waveforms (p.125)
Scaling During Measurement Using a Current
Clamp (p.148)
Basic Workflow (p.35)
(p.59)
(p.79)
(p.54)
(p.117)
Connect the cords
Install the input modules
Install the recording paper
Turn power on
Select the function
Select the input channels

Introduction
2
Thank you for purchasing the HIOKI "Model MR8740/MR8741 Memory HiCorder". To obtain maximum
performance from the instrument, please read this manual carefully, and keep it handy for future reference.
Registered
trademarks
• Microsoft and Windows are either registered trademarks or trademarks of
Microsoft Corporation in the United States, Japan, and other countries.
• CompactFlash is a registered trademark of SanDisk Corporation (USA).
• Sun, Sun Microsystems, Java, and any logos containing Sun or Java are
trademarks or registered trademarks of Oracle Corporation in the United
States and other countries.
• Microsoft Excel and Internet Explorer are either registered trademarks or
trademarks of Microsoft Corporation in the United States and other countries.
When you receive the instrument, inspect it carefully to ensure that no damage occurred during
shipping. In particular, check the accessories, panel switches, and connectors. If damage is evident,
or if it fails to operate according to the specifications, contact your dealer or Hioki representative.
Introduction
Confirming Package Contents
Confirm that these contents are provided. (One each)
Instruction Manual
Application disc*1 (p.327)
• SF8000 Waveform Maker
• Wave Viewer (WV)
• Communication Command Instruction Manual
• U8793, MR8790, MR8791 Instruction Manual*2
MR8740 or MR8741 Memory HiCorder
Accessories
Power Cord
Rack mounting brackets (for EIA standard)
(Model MR8740 only)
Other options specified when ordered
Options List ( p. A 10)
MR8740 MR8741
*1: The latest version can be downloaded from our website.
*2: If one or more Model 8967 Temp Units are installed in the instrument, two ferrite clamp-on chokes (small) will be
supplied per module.
If the 8967 TEMP Unit is installed in the MR8740/MR8741, two ferrite clamp-on
chokes (small) will be supplied per unit.

Safety Information
3
This manual contains information and warnings essential for safe operation of the instrument and
for maintaining it in safe operating condition. Before using it, be sure to carefully read the following
safety precautions.
Protective Gear
The following symbols in this manual indicate the relative importance of cautions and warnings.
Safety Information
Mishandling during use could result in injury or death, as well as damage to the
instrument. Be certain that you understand the instructions and precautions in
the manual before use.
With regard to the electricity supply, there are risks of electric shock, heat gener-
ation, fire, and arc discharge due to short circuits. If anyone who is unfamiliar
with electrical measuring instruments will use the instrument, a person familiar
with such instruments must supervise operations.
This instrument is measured on a live line. Wear the insulating protective gear
according to the regulation to avoid electric shocks.
Symbols Affixed to the Instrument
Indicates that incorrect operation presents an extreme hazard that
could result in serious injury or death to the user.
Indicates that incorrect operation presents a significant hazard that
could result in serious injury or death to the user.
Indicates that incorrect operation presents a possibility of injury to the
user or damage to the instrument.
Indicates advisory items related to performance or correct operation
of the instrument.
Indicates a high voltage hazard.
If a particular safety check is not performed or the instrument is mis-
handled, this may give rise to a hazardous situation; the operator
may receive an electric shock, be burnt or even be fatally injured.
*Indicates that descriptive information is provided below.

Safety Information
4
Symbols in This Manual
Symbols Affixed to the Instrument
Indicates cautions and hazards. When this symbol is printed on the
instrument, refer to the corresponding topic in this Instruction Manual.
Indicates the ON side of the power switch.
Indicates the OFF side of the power switch.
Indicates DC (Direct Current).
Indicates AC (Alternating Current).
Indicates a grounding terminal.
Indicates a fuse.
Symbols for Various Standards
Indicates the Waste Electrical and Electronic Equipment Directive
(WEEE Directive) in EU member states.
Indicates that the product conforms to regulations set out by the EC
Directive.
Notation
Indicates the prohibited action.
(p. ) Indicates the location of reference information.
Indicates quick references for operation and remedies for troubleshoot-
ing.
*Indicates that descriptive information is provided below.
[ ] Menus, commands, dialogs, buttons in a dialog, and other names on the
screen and the keys are indicated in brackets.
Unless otherwise specified, "Windows" represents Windows 2000, Win-
dows XP, or Windows Vista.
"IE" represents Internet Explorer.
Indicates Memory function support.
Indicates FFT Recorder function support.

Safety Information
5
Mouse Operations
Click: Press and quickly release the left button of the mouse.
Right-click: Press and quickly release the right button of the mouse.
Double-click: Quickly click the left button of the mouse twice.
Drag: Move the mouse while holding down the left button of the
mouse, and then release the button at the desired position.
Activate: Click on a screen to activate that screen.
Accuracy
We define measurement tolerances in terms of f.s. (full scale) values, with the following meanings:
f.s. (maximum display value or scale length)
The maximum displayable value or scale length. In this instrument, the maxi-
mum displayable value is the range (V/div) times the number of divisions (20) on
the vertical axis.
Example: For the 1 V/div range, f.s. = 20 V
rdg. (reading value, displayed value, or indicated value)
The value currently being measured and indicated on the measuring instrument.

Safety Information
6
To ensure safe operation of measuring instruments, IEC 61010 establishes
safety standards for various electrical environments, categorized as CAT II to
CAT IV, called measurement categories.
CAT II When directly measuring the electrical outlet receptacles of the primary
electrical circuits in equipment connected to an AC electrical outlet by a
power cord (portable tools, household appliances, etc.)
CAT III When measuring the primary electrical circuits of heavy equipment
(fixed installations) connected directly to the distribution panel, and feed-
ers from the distribution panel to outlets
CAT IV When measuring the circuit from the service drop to the service
entrance, and to the power meter and primary overcurrent protection
device (distribution panel)
Measurement categories
• Using a measuring instrument in an environment designated with a higher-
numbered category than that for which the instrument is rated could result in
severe accidents, and must be carefully avoided.
• Using a measuring instrument that has no category rating in an environment
designated with the CAT II to CAT IV category could result in severe accidents,
and must be carefully avoided.
The applicable measurement category is determined by the input module being
used. Refer to "17.6 Input Modules Specifications" (p.349).

Operating Precautions
7
Follow these precautions to ensure safe operation and to obtain the full benefits of the various functions.
Installing To prevent overheating, be sure to leave the specified clearances around the unit.
• The instrument should be operated only with the bottom side downwards.
• Vents must not be obstructed.
• Do not install the instrument at a slanted angle.
When mounting the instrument in a system rack, make sure the operating tem-
perature range of the instrument will not be exceeded.
Operating Precautions
Before Use
If connection cables or instrument are damaged, there is a risk of electric shock.
Before using the instrument, perform the following inspection.
• Before using the instrument, check that the insulation of the connection cables
is not damaged and that no metal parts are exposed. Using the instrument
under such conditions could result in electric shock. Replace the connection
cable with those specified by our company.
• Verify that it operates normally to ensure that no damage occurred during stor-
age or shipping. If you find any damage, contact your authorized Hioki distribu-
tor or reseller.
Instrument Installation
Installing the instrument in inappropriate locations may cause a malfunction of
instrument or may give rise to an accident. Avoid the following locations:
• Exposed to direct sunlight or high temperatures
• Exposed to corrosive or combustible gases
• Exposed to a strong electromagnetic field or electrostatic charge
• Near induction heating systems (such as high-frequency induction heating sys-
tems and IH cooking equipment)
• Susceptible to vibration
• Exposed to water, oil, chemicals, or solvents
• Exposed to high humidity or condensation
• Exposed to high quantities of dust particles
Do not place the instrument on an unstable table or an inclined place. Knockin-
gover or dropping the instrument can damage the instrument.
Rear
At least 5 cm
At least 5 cm on the left and right sides

Operating Precautions
8
Handling the Instrument and Modules
• Do not exceed the range of the specifications and the rated value of the cable
or the module. Otherwise, the instrument may be damaged or may produce
heat, resulting in personal injury.
The maximum rated voltage to earth does not change when an attenuator or
similar is used at the input. Take the connection method into consideration and
make sure that the rating is not exceeded.
• To avoid electric shock, do not remove the instrumentÅfs cover and the mod-
ule case.
The internal components of the instrument carry high voltages and may
become very hot during operation.
• .. To avoid electric shocks, confirm that the instrument is turned off and the
connection cables are disconnected before removing or replacing a module.
• .To avoid electric shocks, do not operate the instrument with a module
removed.
To use the instrument after removing a module, install a blank panel over the
opening of the removed module.
• To prevent instrument damage or electric shocks, use only the screws for
securing the module in place that shipped with the instrument.
If you lose any screw or find that any screws are damaged, please contact
your Hioki distributor for a replacement.
• To avoid damage to the instrument, protect it from physical shock when trans-
porting and handling. Be especially careful to avoid physical shock from drop-
ping.
• The mounting screws must be firmly tightened or the module may not perform
as specified or may fail.
• To avoid damaging modules, do not touch the module connectors on this
instrument.
• Before transporting the instrument, disconnect all cables and USB memory
sticks.
• When there is no input, the waveform might be unstable due to the induced
voltage, but this is not an error.
• This instrument may cause interference if used in residential areas. Such use
must be avoided unless the user takes special measures to reduce electro-
magnetic emissions to prevent interference to the reception of radio and televi-
sion broadcasts.