Hioki MR8847-51 User manual

MR8847A
Instruction Manual
MEMORY HiCORDER
EN
Feb. 2019 Revised edition 3
MR8847G961-03 19-02H
Be sure to read this manual before using the instrument. p.4
When using the instrument for the
rst time Troubleshooting
Part Names and Functions p.16 Maintenance and Service p.415
Preparing for Measurement
p.25 Error Messages p.422
Video
Scan this code to watch the
instructional video(s).
Carrier charges may apply.
MR8847-51
MR8847-52
MR8847-53

Contents
i
MR8847G961-03
Contents
Usage Index ............................................... 1
Introduction................................................ 2
Verifying Package Contents ..................... 3
Safety Information..................................... 4
Operation Precautions.............................. 7
1 Overview 15
1.1 Product Overview......................... 15
1.2 Part Names and Functions .......... 16
1.3 ScreensConguration................. 19
Explanation of screen contents ................20
1.4 Basic Key Operation .................... 21
1.4.1 Using the HELP Key ..................................22
1.4.2 Using Mouse to Enable Key Operation ......23
2 Preparing for
Measurement 25
2.1 Installing and Removing
Modules......................................... 26
Channel conguration...............................27
2.2 Attaching Connection Cables ..... 28
2.3 Preparing Storage Devices.......... 41
2.3.1 Available Storage Devices (Inserting a
CF Card and a USB Flash Drive) ............... 41
2.3.2 Formatting Storage Devices ......................43
2.4 Loading Recording Paper............ 43
2.5 Supplying Power .......................... 45
2.5.1 Connecting the Power Cord.......................45
2.5.2 Connecting an Earthing Wire to the
GND Terminal (Functional Earth Terminal)..45
2.5.3 Turning On and Off the Instrument.............46
2.6 Setting the Clock .......................... 47
2.7 Adjusting the Zero Position
(zero-adjustment) ......................... 48
2.8 Performing Calibration (When
Model MR8990 is Installed).......... 49
3 Measurement 51
3.1 Measurement Procedure ............. 51
3.2 Inspecting the Instrument
Before Measurement.................... 53
3.3 Setting Measurement
Conditions..................................... 54
3.3.1 Measurement Functions ............................54
3.3.2 Timebase and Sampling Rate ....................56
3.3.3 Setting the Recording Length
(Number of Divisions) ................................60
3.3.4 Setting Screen Layout ...............................63
3.4 ConguringInputChannels
Settings ......................................... 64
3.4.1 Channel Setting Procedure ........................65
3.4.2 Conguring Analog Channels Settings .......67
3.4.3 Conguring Logic Channel Settings ...........70
3.4.4 Display Sheet ............................................ 71
3.5 Starting and Stopping
Measurement ................................ 73
3.6 Measurement in Automatic
Range Setting (Auto-Range
Function) ....................................... 76
4 X-Y Recorder 79
4.1 Measurement procedure.............. 80
4.2 Setting Measurement
Conditions..................................... 81
4.3 Starting and Stopping
Measurement ................................ 82
4.4 Observing X-Y Composite
Curves ........................................... 84
5 Saving/Loading Data
and Managing Files 85
5.1 Data That Can Be Saved and
Loaded........................................... 87
5.2 Saving Data................................... 89
5.2.1 Save Types and Setting Procedure............89
5.2.2 Automatically Saving Waveforms...............90
5.2.3 Saving Data Selectively (SAVE Key)..........97
5.2.4 Saving Waveform Outputting Data to a
Storage Device........................................ 103
5.3 Loading Data............................... 104
5.4 Automatically Loading Settings
(Auto-setup Function)................ 107
5.5 Managing Files ........................... 108
5.5.1 Saving Data............................................. 109
5.5.2 Checking the Contents in a Folder
(Opening a Folder)....................................112
5.5.3 Creating New Folders ...............................112
5.5.4 Deleting Files and Folders.........................113
5.5.5 Sorting Files ............................................ 114
5.5.6 Renaming Files and Folders .....................115
5.5.7 Copying a File Into a Specied Folder.......116
5.5.8 Printing the File Table................................117
6 Printing Data 119
6.1 Print Type and Procedure.......... 120
6.2 Setting Auto-printing.................. 121
6
5
4
3
2
1

Contents
ii
7.8 Viewing Waveforms Divided
Into Blocks .................................. 153
8 Advanced Functions 155
8.1 Adding Comments ..................... 156
8.1.1 Adding, Displaying, and Printing the Title
Comment................................................. 156
8.1.2 Adding, Displaying, and Printing the
Channel Comments ................................. 157
8.1.3 Entering Alphanumeric Characters........... 159
8.2 Displaying Waveforms During
the Writing in the Memory
Simultaneously
(Roll Mode).................................. 163
8.3 Overlaying New Waveforms
With Past Waveforms................. 164
8.4 Setting Channels to Be Used
(Extending the Recording
Length) ........................................ 166
8.5 Converting Input Values
(Scaling Function) ...................... 167
8.5.1 Example of Scaling Settings .................... 169
8.6 Setting the Waveform Position
(Variable Function) ..................... 174
8.7 Fine-Adjusting Input Values
(Vernier Function)....................... 177
8.8 Inverting the Waveform (Invert
Function) ..................................... 178
8.9 Copying Settings to Other
Channels (Copy Function)......... 179
8.10 Setting Details of Modules ........ 180
8.10.1 Setting the Anti-aliasing Filter (A.A.F.)
(Model 8968 High Resolution Unit)........... 181
8.10.2 Setting the Probe Voltage Dividing Ratio.. 181
8.10.3 Setting Model 8967 Temp Unit ................. 182
8.10.4 Setting Model 8969 and U8969 Strain
Unit.......................................................... 183
8.10.5 Setting Model 8970 Freq Unit .................. 184
8.10.6 Setting Model 8971 Current Unit ............. 187
8.10.7 Setting Model 8972 DC/RMS Unit............ 187
8.10.8 Setting Model MR8990 Digital Voltmeter
Unit.......................................................... 188
8.10.9 Setting Model U8974 High Voltage Unit ... 189
8.10.10 Setting MR8790 Waveform Generator
Unit.......................................................... 190
8.10.11 Setting MR 8971 Pulse Generator Unit .... 192
8.10.12 Setting U8793 Arbitrary Waveform
Generator Unit......................................... 194
8.11 Registering Waveforms in the
U8793 Arbitrary Waveform
Generator Unit ............................ 197
6.3 Manually Printing Data by
Pressing the PRINT Key
(Selection Print).......................... 124
6.4 Setting the Print Density of the
Waveform .................................... 126
6.5 ConguringthePrinterSettings127
6.6 Advanced Print Functions......... 130
6.6.1 Printing the Screenshot............................ 130
6.6.2 Printing Reports (A4-Sized Print) ............. 130
6.6.3 Printing a List........................................... 132
6.6.4 Printing the Text Cooments ...................... 132
7 Monitoring and
Analyzing Waveforms
on the Waveform
Screen 133
7.1 Reading Measured Values
(Using Cursors A and B)............ 134
7.2 Specifying the Waveform
Range (Cursors A and B)........... 139
7.3 Moving the Waveform Display
Position ....................................... 141
7.3.1 Display Position ....................................... 141
7.3.2 Scrolling the Waveforms With the Jog
Dial and Shuttle Ring ............................... 141
7.3.3 Changing Position (Jump Function).......... 143
7.4 Plotting X-Y Composite
Curves ......................................... 144
7.5 Magnifying and Demagnifying
Waveforms .................................. 146
7.5.1 Magnifying and Demagnifying Waveforms
Horizontally (in the Time Axis Direction)
.... 146
7.5.2 Zoom Function (Horizontally Magnifying
a Part of Waveforms [in the time axis
direction])................................................. 147
7.5.3 Magnifying/demagnifying the
Waveforms Vertically (in the Voltage
Axis Direction) ......................................... 149
7.6 Monitoring Input Levels (Level
Monitor) ....................................... 150
7.6.1 Level Monitor........................................... 150
7.6.2 Numerical Value Monitor .......................... 151
7.7 Switching the Waveform
Screen Display
(Display Menu)............................ 152
7.7.1 Displaying Upper and Lower Limits on
the Waveform Screen.............................. 152
7.7.2 Displaying Comments on the Waveform
Screen..................................................... 152
7.7.3 Switching the Waveform Display Width .... 152
7.7.4 Switching the Sheet to Be Displayed........ 153

Contents
iii
10.5 Printing the Numerical
Calculation Results .................... 238
10.6 Numerical Calculation Types
and Descriptions ........................ 239
11 Waveform Calculation
Function 243
11.1 Waveform Calculation
Workow ..................................... 244
11.2 Waveform Calculation Settings. 246
11.2.1 Displaying the Waveform Calculation
Results .................................................... 248
11.2.2 Setting Constants ....................................250
11.2.3 Change the Display Method for
Calculated Waveforms............................. 251
11.3 Waveform Calculation
Operators and Results............... 254
12 Memory Division
Function 257
12.1 ConguringtheRecording
Settings ....................................... 259
12.2 ConguringtheDisplay
Settings ....................................... 260
13 FFT Function 263
13.1 Overview and Features .............. 263
13.2 OperationWorkow(Reference
Data) ............................................ 264
13.3 Setting the FFT Analysis
Conditions................................... 265
13.3.1 Selecting the FFT Function ...................... 265
13.3.2 Setting the Data Source for Analysis
(Reference Data) .....................................266
13.3.3 Setting the Frequency Range and
Number of Analysis Points. ...................... 267
13.3.4 Decimating and Calculating Data ............. 269
13.3.5 Setting the Window Function ...................270
13.3.6 Conguring the Analysis Result Peak
Value Setting ........................................... 271
13.3.7 Averaging Analysis Results (Waveform
Averaging)............................................... 272
13.3.8 Highlighting Analysis Results (Phase
Spectra Only) ..........................................275
13.3.9 Conguring the Analysis Mode Settings ... 276
13.3.10 Setting the Display Range of the
Vertical Axis (Scaling) ..............................280
13.3.11 Setting and Changing Analysis
Conditions on the Waveform Screen........ 281
8.12 Saving Waveforms Registered
in Model U8793 onto a Storage
Device.......................................... 200
8.13 Setting Output Waveform
Parameters on the Waveform
Screen ......................................... 200
9 Setting the Trigger 201
9.1 Setting Procedure ...................... 202
9.2 Setting the Trigger Mode ........... 203
9.3 Triggering the Instrument
Using Analog Signals................. 204
9.4 Triggering the Instrument
Using Logic Signals (Logic
Trigger) ........................................ 210
9.5 Triggering the Instrument
attheSpeciedTimeorat
Regular Intervals (Timer
Trigger) ........................................ 212
9.6 Triggering the Instrument
Externally (External Trigger) ..... 216
9.7 Triggering the Instrument
Manually (Manual Trigger) ......... 216
9.8 Setting the Pre-trigger ............... 217
9.8.1 Setting the Trigger Start Point (Pre-
trigger)..................................................... 217
9.8.2 Setting the Trigger Acceptance (Trigger
Priority).................................................... 219
9.9 Setting the Trigger Timing......... 220
9.10 Setting the Trigger Logical
Connective (AND/OR) Among
the Trigger Sources.................... 222
9.11 Searching the Measured Data
Using the Trigger Settings......... 223
10 Numerical Calculation
Functions 225
10.1 Numerical Calculation
Procedure.................................... 226
10.2 Setting the Numerical Value
Calculation .................................. 228
10.2.1 Displaying the Numerical Calculation
Results .................................................... 232
10.3 Judging the Calculation
Results ........................................ 233
10.3.1 Displaying the Judgment Results and
Outputting the Signals.............................. 235
10.4 Saving the Numerical
Calculation Results .................... 236
10
9
8
7
13
12
11
Appx. Ind.

Contents
iv
16.2.1 Setting HTTP With the Instrument............338
16.2.2 Connecting the Computer to the
Instrument With the Internet Browser .......339
16.2.3 Operating the Instrument With the
Internet Browser ......................................340
16.3 Accessing Files on the
Instrument From the computer
(Using the FTP)........................... 346
16.3.1 Setting the FTP With the Instrument ........347
16.3.2 Connecting the Computer to the
Instrument Using the FTP ........................348
16.3.3 Managing Files With the FTP................... 349
16.4 Transferring Data to the
computer ..................................... 350
16.5 Wave Viewer (Wv)....................... 351
16.6 ConguringtheUSBSettings
and Connecting the Instrument
to the Computer
(Before
Performing Command
Communications) ....................... 352
16.6.1 Conguring the USB Settings With the
Instrument ...............................................352
16.6.2 Installing the USB Driver .......................... 352
16.7 Controlling the Instrument with
Command Communications
(LAN/USB) ................................... 357
16.7.1 Setting the Instrument..............................358
16.8 Operating the Instrument
Remotely and Acquiring Data
Using the Model 9333 LAN
Communicators .......................... 359
17 Controlling the
Instrument Externally 361
17.1 Connection of the External
Control Terminals....................... 362
17.2 External I/O ................................. 363
17.2.1 External Input (START/EXT.IN1) (STOP/
EXT.IN2) (PRINT/EXT.IN3)....................... 363
17.2.2 External Output (GO/EXT.OUT1) (NG/
E X T. O UT 2 ) ..............................................365
17.2.3 External Sampling (EXT.SMPL)................367
17.2.4 Trigger Output (TRIG OUT) .....................369
17.2.5 External Trigger Terminal (EXT.TRIG) ......370
18 Specications 371
18.1 GeneralSpecicationsofthe
Instrument................................... 371
18.2 Common Functions.................... 374
18.3 Measurement Functions ............ 376
18.3.1 Memory Function.....................................376
13.4 ConguringtheChannel
settings........................................ 282
13.5 ConguringtheScreenDisplay
Settings ....................................... 283
13.5.1 Displaying the Running Spectrum ............ 285
13.6 Saving Analysis Results............ 288
13.7 Printing Analysis Results .......... 289
13.8 Analyzing Waveforms on the
Waveform Screen ....................... 290
13.8.1 Calculating After Specifying the
Calculation Starting Point.........................290
13.9 FFT Analysis Modes................... 292
13.9.1 Analysis Modes and Display Examples ....292
13.9.2 Analysis Mode Functions ......................... 310
14 Waveform Evaluation
Function 311
14.1 Evaluating Waveforms and
Giving GO/NG Judgments
(MEM, FFT Function)...................311
14.2 Setting the Evaluation Area....... 314
14.3 ConguringtheWaveform
Evaluation Setting ...................... 316
14.4 Setting the Waveform
Evaluation Stopping
conditions ................................... 317
14.5 Creating the Evaluation Area .... 319
14.6 Details About the Editor
Commands.................................. 320
15 Setting the System
Environment 325
16 Connecting the
Instrument to a
Computer 331
16.1 Setting LAN and Connecting
the Instrument to the LAN
Network (Before Using FTP/
Internet Browser/Command
Communications) ....................... 332
16.1.1 Conguring the LAN Settings With the
Instrument ...............................................332
16.1.2 Connecting the Instrument to the
Computer With the LAN Cable................. 336
16.2 Controlling the Instrument
Remotely (Using an Internet
Browser)...................................... 338

Contents
v
Index Ind.1
18.3.2 Recorder Function ...................................377
18.3.3 X-Y Recorder Function ............................378
18.3.4 FFT Function ...........................................379
18.4 Other Functions.......................... 380
18.5 File ............................................... 385
18.6 SpecicationsofModules ......... 387
18.6.1 Model 8966 Analog Unit...........................387
18.6.2 Model 8967 Temp Unit .............................388
18.6.3 Model 8968 High Resolution Unit ............. 391
18.6.4 Model 8969 Strain Unit,
U8969 Strain Unit ....................................393
18.6.5 Model 8970 Freq Unit ..............................395
18.6.6 Model 8971 Current Unit ..........................397
18.6.7 Model 8972 DC/RMS Unit........................ 399
18.6.8 Model 8973 Logic Unit ............................. 401
18.6.9 Model MR8990 Digital Voltmeter Unit.......402
18.6.10 Model U8974 High Voltage Unit ...............404
18.6.11 Model U8793 Arbitrary Waveform
Generator Unit.........................................406
18.6.12 Model MR8790 Waveform Generator
Unit..........................................................409
18.6.13 Model MR8791 Pulse Generator Unit....... 411
Specications of output connector..........413
19 Maintenance and
Service 415
19.1 Trouble Shooting........................ 417
19.2 Resetting the Instrument ........... 420
19.2.1 Resetting System Settings....................... 420
19.2.2 Resetting Waveform Data........................ 421
19.3 Error Messages .......................... 422
19.4 Self-Test (Self-Diagnostics)....... 427
19.4.1 ROM/RAM Check....................................427
19.4.2 Printer Check........................................... 428
19.4.3 Display Check .........................................428
19.4.4 Key Check...............................................429
19.4.5 System Conguration Check ...................429
19.5 Cleaning the instrument ............ 431
19.6 Disposing of the Instrument
(Removing Lithium Battery) ...... 433
Appendix Appx.1
Appx. 1 Default Values for Major
Settings............................. Appx.1
Appx. 2 For Reference................... Appx.2
Appx. 3 About Options................ Appx.13
Appx.4 FFTDenitions............... Appx.20
19
Appx. Ind.
16
15
14
18
17

Contents
vi

1
Usage Index
Usage Index
Basic measurement procedure
1Installing the instrument
(p. 25)
Performing measurement in the automatic
range setting (
p. 76
)
Monitoring changes in input signals (p. 201)
Manually triggering the instrument (p. 216)
Entering comments (p. 156)
Freely setting the waveform display (p. 64)
Converting input values (p. 167)
Copying settings to other channels (p. 179)
Eliminating noise (Low-pass lter) (p. 70)
Plotting X-Y composite curves (p. 144)
Locking the operation keys (p. 17)
Formatting a CF Card (p. 43)
Scaling measured values obtained with current
clamp sensors (p. 169)
Installing the instrument
Installing modules
Connecting cables
Loading the recording paper
Turning on the instrument
2Setting the instrument
(p. 51)
Selecting a function
Selecting measurement settings
Selecting input channels
3 Measuring input signals (p. 73)
Starting measuring input signals
Completing the measurement
4 Analyzing ( p. 133 ), saving ( p. 85 ), and printing data ( p. 119 )
Performing analysis
Saving/printing results
(optionally)
5 Completing the measurement (p. 46)
Turning off the instrument
10
9
8
7
6
5
4
3
2
1
Appx. Ind.

2
Introduction
Introduction
Thank you for purchasing the Hioki MR8847A Memory HiCorder (MR8847-51, MR8847-52, MR8847-53).
To obtain maximum performance from the instrument, please read this manual rst, and keep it handy for
future reference.
The optional clamps (p. Appx.13) collectively mean “clamp sensors.”
The following instruction manuals are available for this instrument. Refer to the relevant manual as usage.
Instruction Manual Description
1Measurement Guide
(booklet)
Read this booklet rst.
Contains basic operating procedures for those who use this instrument
for the rst time.
2
(This
document)
Instruction Manual
(booklet)
Contains details and specifications regarding the functions and
operations of this instrument.
3Communication
Command
Instruction Manual
(PDF)
Contains a list of the communication commands and their explanations
to control the instrument with a computer.
4 U8793, MR8790,
MR8791 Instruction
Manual
(PDF)
Contains specications and explanations of functions/operations of
Models U8793 Arbitrary Waveform Generator Unit, MR8790 Waveform
Generator Unit, MR8791 Pulse Generator Unit, and SF8000 Waveform
Maker.
Trademarks
•Microsoft Windows, Excel and Internet Explorer are either registered trademarks or trademarks of
Microsoft Corporation in the United States 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.

3
Verifying Package Contents
Verifying Package Contents
When you receive your 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 specications, contact your authorized Hioki distributor or reseller.
Store the packaging in which the instrument was delivered, as you will need it when transporting the
instrument.
Instrument and accessories
Conrm that you received the following items: (One each)
MR8847A Memory HiCorder
(MR8847-51, MR8847-52, MR8847-53)
Accessories
Measurement Guide
Instruction Manual (this docu-
ment)
Power cord
Input cable label USB cable
Model 9231 Recording Paper Paper Roll Axle ×2
Ferrite clamp-on choke*1
(for LAN/USB cable)
Application disc*2 (CD) (p. 351)
•Model SF8000 Waveform Maker
•Wave Viewer (WV)
•Communication Command Instruction Manual
•U8793, MR8790, MR8791 Instruction Manual
Other options as specied in your order “Appx. 3.1 Options” (p. Appx.13)
*1: When one or more pieces of Model 8967 Temp Unit are installed in the instrument, two ferrite clamp-
on chokes (small) are supplied per module.
*2: The latest version can be downloaded from our website.
10
9
8
7
6
5
4
3
2
1
Appx. Ind.

4
Safety Information
Safety Information
This instrument and modules are designed to conform to IEC 61010 Safety Standards, and has been
thoroughly tested for safety prior to shipment. However, using the instrument in a way not described in
this manual may negate the provided safety features.
Before using the instrument, be certain to carefully read the following safety notes:
DANGER
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.
WARNING
With regard to the electricity supply, there are risks of electric shock, heat
generation, re, and arc discharge due to short circuits. Individuals using an
electrical measuring instrument for the rst time should be supervised by a
technician who has experience in electrical measurement.
Protective Gear
WARNING
This instrument measures live lines. To prevent electric shock, use appropriate
protective insulation and adhere to applicable laws and regulations.
Notation
In this document, the risk seriousness and the hazard levels are classied as follows.
DANGER Indicates an imminently hazardous situation that will result in death or serious injury
to the operator.
WARNING Indicates a potentially hazardous situation that may result in death or serious injury to
the operator.
CAUTION Indicates a potentially hazardous situation that may result in minor or moderate injury
to the operator or damage to the instrument or malfunction.
IMPORTANT Indicates information related to the operation of the instrument or maintenance tasks
with which the operators must be fully familiar.
Indicates a high voltage hazard.
If a particular safety check is not performed or the instrument is mishandled, this may
give rise to a hazardous situation; the operator may receive an electric shock, may
get burnt or may even be fatally injured.
Indicates prohibited actions.
Indicates the action which must be performed.
*Additional information is presented below.

5
Safety Information
Symbols Afxed to the Instrument
Indicates cautions and hazards. When the symbol is printed on the instrument, refer to the
corresponding topic in the Instruction Manual.
Indicates the ON side of the power switch.
Indicates the OFF side of the power switch.
Indicates a fuse.
Indicates a grounding terminal.
Indicates DC (Direct Current).
Indicates AC (Alternating Current).
Indicates a burn hazard if touched directly.
Standards Symbols
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 EU Directive.
Other Symbols
This manual uses the following symbols to indicate specic information for operating the instrument.
(p. ) Indicates the location of reference information.
CURSOR
(Bold-faced) Names of settings, buttons, and other screen elements are written in bold blue text.
Unless otherwise specied, “Windows” represents Windows Vista, Windows 7, and Win-
dows 8.
IE is an acronym for Internet Explorer.
[ ] Menus, commands, dialogs, buttons in a dialog, and other names on the screen and keys
are indicated in brackets.
Indicates that the memory function supports the function.
Indicates that the recorder function supports the function.
Indicates that the X-Y recorder function supports the function.
Indicates that the FFT recorder function supports the function.
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.
10
9
8
7
6
5
4
3
2
1
Appx. Ind.

6
Safety Information
Accuracy
We dene measurement tolerances in terms of f.s. (full scale), rdg. (reading), and setting values
with the following meanings:
f.s. (maximum display value
or scale length)
The maximum displayable value or scale length.
For this instrument, the maximum displayable value equals the numerical
number of a presently set range (unit: V/div) multiplied by the number of di-
visions (20) on the vertical axis.
Example: When the range is set to 1 V/div, f.s. = 20 V
rdg. (reading or displayed
value)
The value currently being measured and indicated on the measuring
instrument.
Setting Indicates the value set as the output voltage, current, or other quantity.
Measurement Categories
To ensure safe operation of measuring instruments, IEC 61010 establishes safety standards
for various electrical environments, categorized as CAT II to CAT IV, and called measurement
categories.
DANGER
•Using a measuring instrument in an environment designated with a higher-
numbered category than that for which the instrument is rated could result in a
severe accident, and must be carefully avoided.
•Never use a measuring instrument that lacks category labeling in a CAT II to
CAT IV measurement environment. Doing so could result in a serious accident.
CAT II: When directly measuring the electrical outlet receptacles of the primary electrical
circuits in equipment connected to an AC electrical outlet with a power cord (portable
tools, household appliances, etc.)
CAT III: When measuring the primary electrical circuits of heavy equipment (xed installations)
connected directly to the distribution panel, and feeders 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)
T
Outlet
CAT II
Internal Wiring
Distribution Panel
Service Entrance
Service Drop
CAT IV
Power Meter
CAT III
Fixed Installation
The applicable measurement category is determined based on the module being used.
Refer to “18.6 Specications of Modules” (p. 387).

7
Operation Precautions
Operation Precautions
Before Use
Follow these precautions to ensure safe operation and to obtain the full benets of the various
functions.
DANGER
If the connection cables or the instrument are damaged, there is a risk of an
electric shock. Perform the following inspection before using the instrument:
•Before using the instrument, check that the coatings of the connection cables
are neither ripped nor torn and that no metal parts are exposed. Using the
instrument under such conditions could result in an electric shock. Replace the
connection cables with those specied by our company.
•Verify that it operates normally to ensure that no damage occurred during
storage or shipping. If you nd any damage, contact your authorized Hioki
distributor or reseller.
Installing the instrument and modules
WARNING
Installing the instrument and modules in inappropriate locations may cause a
malfunction of the 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 eld or electrostatic charge
•Near induction heating systems (such as high-frequency induction heating
systems 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
CAUTION
Do not place the instrument on an unstable table or an inclined place. Dropping
or knocking down the instrument can cause injury or damage to the instrument.
Installing the instrument
To prevent overheating, be sure to leave the specied clearances around the instrument.
•The instrument should be operated only with the bottom or rear side downwards.
•Vents must not be obstructed.
•Do not install the instrument at an angle.
At least 5 cm
on all sides
Left side
Vents
10
9
8
7
6
5
4
3
2
1
Appx. Ind.

8
Operation Precautions
Handling the Instrument and Modules
DANGER
•Do not use the modules or the cables with circuits that exceed those ratings or
specications.
Doing so may damage the instrument or cause it to become hot, resulting in
bodily injury.
Even including any devices, such as an attenuator, in the input terminal will
never increase the maximum rated voltage to earth. Take care of the connection
not to allow any input voltage to exceed the maximum rated voltage to earth.
•To avoid an electric shock, do not remove the instrument’s cover and the
modules’ cases.
The internal components of the instrument carry high voltages and may
become very hot during operation.
WARNING
•To avoid an electric shock, before removing or replacing an input module,
conrm that the instrument is turned off and that the connection cords are
disconnected.
•To avoid the danger of an electric shock, never operate the instrument with an
input module removed. To use the instrument with a module removed, install a
blank panel over the opening of the removed module.
•To prevent the instrument damage or an electric shock, use only the screws
that are originally installed for securing the module in place.
If you have lost any screws or nd that any screws are damaged, please contact
your Hioki distributor for a replacement.
CAUTION
•To avoid damage to the instrument, protect it from physical shock when
transporting and handling it. Be especially careful to avoid physical shock due
to dropping it.
•The mounting screws must be rmly tightened or the module may not perform
to specications, or may even fail.
•To avoid damaging modules, do not touch the connectors, installed in the
instrument, to which the modules are connected.
•Before carrying the instrument, disconnect all cables and remove the CF card, USB
ash drive, and the recording paper.
•Displayed waveforms can frequently uctuate due to induction potential even when no
voltage is applied. This, however, is not a malfunction.
•This instrument may cause interference if used in residential areas. Such use must be
avoided unless the user takes special measures to reduce electromagnetic emissions to
prevent interference to the reception of radio and television broadcasts.
Handling the printer and the recording paper
WARNING
The print head and surrounding metal parts can become hot. Be careful to avoid
touching these parts.

9
Operation Precautions
CAUTION
Be careful not to cut yourself with the paper cutter.
•Please use only the specied recording paper. Using non-specied paper may not only
result in faulty printing, but printing may become impossible.
•If the recording paper is skewed on the roller, paper jams may result.
•Always use the paper cutter to cut the printed paper. Excessive paper dust can
accumulate on the roller if the paper is cut with the print head, which may result in paper
jams or white streaks in the printing.
Storing data recordings
The recording paper is thermally sensitive. Observe the following precautions to avoid paper discoloration
and fading.
•To avoid paper discoloration, do not expose it to direct sunlight. Store the paper at no more than 40°C
and 90% RH.
•Store the paper away from dew and damp places.
•Make photocopies of recording printouts that are to be handled or stored for legal purposes.
•If the thermal paper is exposed to an organic solvent such as alcohol or ketone, it may no longer
develop properly, and recorded data may fade. Keep the printer papers away from exible PVC lms
and pressure sensitive tapes including scotch tapes because they contain organic solvents.
• Also, the thermal recording paper is ruined by contact with wet diazo copy paper.
Avoid exposure to direct
sunlight.
Avoid exposure to volatile
organic solvents like
alcohol, ethers, and
ketones.
Do not store the paper at
more than
40°C (104°F) and 90%
RH.
Avoid contact with exible
PVC lms or adhesive
tapes such as scotch
tapes.
Avoid stacking with wet
Diazo copy paper.
Storing recording paper
•Store thermal paper where its temperature will not exceed 40°C.
• The paper will deteriorate if exposed to light for a long time; thus, do not remove the wrapping paper
from the roll until it is ready to be used.
10
9
8
7
6
5
4
3
2
1
Appx. Ind.

10
Operation Precautions
Handling storage devices
CAUTION
•Do not remove the storage device while it is being accessed by the instrument (
while the
SAVE
key is lit in blue). Data saved on the device could be lost.
•Do not turn off the instrument while it is accessing the storage device ( while the
SAVE
key is lit up in blue). Data saved on the device could be lost.
• Do not carry the instrument with a USB ash drive left connected. Damage could result.
•Exercise care when using such products because static electricity could damage the
storage device or cause a malfunction of the instrument.
• Do not subject the SSD to extreme shock or vibration. Shock can cause it to be
damaged.
IMPORTANT
•No compensation is available for loss of data stored on the built-in drive (SSD) or a removable
storage device, regardless of the content or cause of damage or loss. Be sure to back up any
important data saved on the built-in drive (SSD) or the removable storage device.
•Use only CF cards sold by Hioki. (No adapter is required to insert a CF card into the
instrument.)
•Compatibility and performance are not guaranteed for PC cards made by other manufacturers.
You may be unable to read from or save data to such cards.
■Hioki optional CF cards (with an adapter accompanying)
Model 9728 PC Card 512M, Model 9729 PC Card 1G, Model 9830 PC Card 2G
•With some external storage device, the instrument may not start up if it is turned on while the
external storage device is inserted. In such a case, turn on the instrument rst, and then insert
the external media. Prior testing is recommended.
• The instrument does not support particular kind of USB ash drives, such as those that require
ngerprint authentication or a password.
•When saving or loading data, insert the storage device before selecting data to be saved.
When the storage device is not inserted, no devices are not displayed in the le list.
• All storage devices (built-in drive [SSD], USB ash drive, and CF card) have a limited service
life. After extensive use for a long period, saving and loading data may be disabled. In that
case, replace the device with a new one.
•The built-in drive (SSD) is a consumable part. When the saved data reaches the capacity (about
60 TB), no further data can be recorded. In such a case, the SSD should be replaced with a
new one.
•When the instrument is left powered off for a one year or more, the data saved on the built-in
drive (SSD) may be lost. Be sure to back up the data if the instrument is left powered off for a
long time.
• Devices the automatic data saving supports are the built-in drive (SSD), a USB ash drive, and
a CF card.
• Data can also be automatically saved on a USB ash drive; however, we recommend using
Hioki optional CF card instead for data protection.

11
Operation Precautions
Before connecting cables
DANGER
When measuring power line voltage
•Connect the connecting cables to only the secondary side of a breaker. Even
if a short-circuit occurs on the secondary side of the breaker, the breaker will
interrupt a short-circuit current. Do not connect them to the primary side of the
breaker because an unrestricted current ow could damage the instrument and
facilities if a short circuit occurs.
•To prevent an electrical shock and a bodily injury, do not touch any input
terminals on the VT (PT), CT or the instrument when they are in operation.
•Do not leave the measurement cables connected to the instrument in an
environment where voltage surges exceeding the maximum input voltage may
occur. Subjecting the instrument to such a voltage may result in damage to the
instrument or a serious accident.
•Do not short-circuit two wires to be measured by bringing the connection
cables into contact with them. Arcs or such grave accidents are likely to occur.
•To avoid a short-circuit or an electric shock, do not touch the metal parts of the
connecting cable clips.
•To avoid electrical shock, be careful to avoid shorting live lines with the
connection cable chips.
WARNING
To avoid an electric shock and a short-circuit accident, use only the specied test
leads to connect the instrument input terminals to the circuit to be tested.
•To avoid an electric shock, do not exceed the lower of the ratings shown on the
instrument and connection cords.
To prevent an electric shock, conrm that the white or red portion (insulation
layer) inside the cable is not exposed. If a color inside the cable is exposed, do
not use the cable.
CAUTION
• The cable is hardened in the freezing temperatures. Do not bend or pull it to avoid
tearing its shield or cutting cable.
• Connecting cables to the BNC jacks on modules
Do not use any cable terminated with a metal BNC connector. If you connect a metal
BNC cable to an insulated BNC connector, the insulated BNC connector and the
instrument may be damaged.
To prevent cable damage, do not step on cables or pinch them between other objects.
Do not bend or pull on cables at their base.
IMPORTANT
• Use only the specied connection cables. Use of any cable not specied by our company does
not allow safe measurements due to poor connection or other reasons.
•For detailed precautions and instructions regarding connections, refer to the instruction
manuals for your modules, connection cables, etc.
10
9
8
7
6
5
4
3
2
1
Appx. Ind.

12
Operation Precautions
Before connecting a logic probe to the measurement object
DANGER
To avoid an electric shock, a short-circuit, and damage to the instrument, observe
the following precautions:
•The ground pin in the logic connector (plug) of Model 9320-01 Logic Probe and
Model 9327 Logic Probe are not isolated from the instrument’s ground (common
ground).
Supply power to the instrument with the provided power cord and measurement
objects from a single mains circuit.
Connecting the instrument and a measurement object to different mains circuits
from one another or using a non-grounding power cord may cause damage to
the measurement object or the instrument because of current owing through
the logic probes resulting from the potential difference between the grounds of
the different wiring systems.
To avoid that, we recommend the following connection procedure:
Measurement
Object
Measurement
Object
GND
Logic probe
Logic probe
Functional Earth
Terminals
Memory
HiCorder
Memory
HiCorder
Connect the provided power cord
to the instrument and supply
power from the same outlet as the
measurement object.
Connect the measurement object’s
ground to the GND terminal
(functional earth terminal) of the
instrument.
(Always supply power from the
single mains circuit.)
Refer to
“2.5.2 Connecting an Earthing
Wire to the GND Terminal (Functional
Earth Terminal)” (p. 45).
Before turning on the instrument
WARNING
•To avoid electrical accidents and to maintain the safety specications of this
instrument, connect the power cord provided only to an outlet.
•Before turning the instrument on, make sure the supply voltage matches that
indicated on its power connector. Connection to an improper supply voltage
may damage the instrument and present an electrical hazard.
CAUTION
Avoid using an uninterruptible power supply (UPS), DC/AC inverter with rectangular-
wave or pseudo-sine-wave output to power the instrument. Doing so may damage the
instrument.