Hioki MR8848 User guide

MR8848

HIOKI MR8848A961-00

Instruction Manual

MEMORY HiCORDER

Read carefully before use.
Keep for future reference.

Safety Information

Part Names and Functions

Measurement

June 2025 Edition 1
MR8848A961-00

Check for the latest edition and
other language versions.



p.14 Maintenance and Service p.431



p.26 Error Messages



p.65



[600666850]

p.438

EN

HIOKI MR8848A961-00

Contents

HIOKI MR8848A961-00

Usage Index
Introduction
Inspecting Package Contents
Notation
Safety Information
Operation Precautions

......................................................9

......................................................10

....................... 11

............................................................12

..........................................14

...................................15

1 Overview 25

1.1 Product Overview

1.2 Part Names and Functions

1.3 ScreensConguration

Display

.....................................................30

1.4 Basic Key Operation

Using the HELP key
Using mouse to enable key operation

.................................25

.................26

.........................29

............................31

..................................32

........33

2 Preparing for

Measurement

2.1 Installing and Removing Units

Channelconguration

2.2 Attaching Connection Cords

Measuring voltage
Measuring frequency, number of
rotations, and count
Measuring temperature
Measuring vibration or displacement
with a strain gauge transducer
Measuring current
Measuring acceleration
Measuring logic signals
Measuring voltage with a high degree of
accuracy (digital voltmeter)
Measuring high voltage
Outputting waveforms
Outputting a pulse waveform

2.3 Preparing Storage Devices

Available storage devices (inserting an

SDcardandaUSBashdrive)

Formatting storage devices

2.4 Loading Recording Paper (When
U8351 Printer Unit is Installed)

2.5 Supplying Power

Connecting the power cord
Connecting an earthing wire to the GND
terminal (functional earth terminal)

Turningonando󰀨theinstrument

2.6 Setting the Clock

2.7 Adjusting the Zero Position (Zero­Adjustment)

...........................................63

35

............36

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....................................39

..................................41

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...................43

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...........59

...................................60

.......................60

............60

..............61

..................................62

2.8 Performing Calibration (When
MR8990 is Installed)

............................64

3 Measurement 65

3.1 Measurement Procedure

3.2 Inspecting the Instrument Before
Measurement

........................................67

3.3 Setting Measurement Conditions

Measurement functions
Timebase and sampling rate
Recording length (number of divisions)
Screen layout

...........................................76

3.4 ConguringInputChannelsSettings

Channel setting procedure
Analog channel settings
Logic channel settings
Display sheet

............................................85

3.5 Starting and Stopping Measurement

3.6 Measurement in Automatic Range
Setting (Auto-Range Function)

.....................65

.......68

.............................68

.....................70

......73

.77

........................78

............................80

..............................84

.86

...........89

4 X-Y Recorder 91

4.1 Measurement Procedure

4.2 Setting Measurement Conditions

4.3 Starting and Stopping Measurement

4.4 Observing X-Y Composite Curves

Saving and printing waveforms

.....................92

.......93

.94

.....95

..................95

5 Saving/Loading Data

and Managing Files

5.1 Data That Can be Saved and
Loaded

5.2 Saving Data

Save types and setting procedure
Automatically saving waveforms
Saving waveforms in real time (option)
Saving data selectively (SAVE key)
Saving waveform output data to a
storage device

5.3 Loading Data

5.4 Automatically Loading Settings
(Auto-setup Function)

5.5 Managing Files

Saving data
Checking the contents in a folder
(opening a folder)

Creatinglesandfolders

...................................................99

.........................................101

........................................119

.......................................120

........................123

...................................124

............................................125

....................................127

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97

...........101

..............102

....108

.........113

MR8848A961-00

3

Contents

HIOKI MR8848A961-00

Deletinglesandfolders
Sortingles
Renaminglesandfolders
Copyingaleintoaspeciedfolder
Printingtheletable

............................................129

.........................128

......................130

........131

...............................132

6 Printing Data (When

U8351 Printer Unit is
Installed)

6.1 Print Type and Procedure

6.2 Setting Auto-printing

6.3 Manually Printing Data by
Pressing the PRINT Key (Selection

.....................................................137

Print)

6.4 Setting the Print Density of the
Waveform

6.5 ConguringthePrinterSettings

6.6 Advanced Print Functions

Printing a screenshot
Printing reports (A4 size)
Printing a list
Printing the text comments

133

..................134

...........................135

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.......140

.................143

..............................143

.........................143

...........................................144

......................144

7 Monitoring and

Analyzing Waveforms
on the Waveform
Screen

7.1 Reading Measured Values (Using
Cursors A and B)

7.2 Specifying the Waveform Range
(Cursors A and B)

7.3 Moving the Waveform Display
Position

Display position
Scrolling the waveforms with the jog dial
and shuttle ring
Changing position (jump function)

7.4 Plotting X-Y Composite Curves

7.5 Magnifying and Demagnifying
Waveforms

Magnifying and demagnifying
waveforms horizontally
(in the time axis direction)
Zoom function {horizontally magnifying
a part of waveforms
(in the time axis direction)}

145

................................146

...............................151

................................................152

......................................152

.......................................152

...........153

........154

..........................................156

.......................156

......................157

Magnifying/Demagnifying the
waveforms vertically
(in the voltage axis direction)

...................159

7.6 Monitoring Input Levels (Level
Monitor)

Level monitor
Numerical value monitor

................................................160

..........................................160

.........................161

7.7 Switching the Waveform Screen
Display (Display Menu)

Displaying upper and lower limits on the
waveform screen
Displaying comments on the waveform
screen

....................................................162

Switching the waveform display width
Switching channel information (U8975,
U8977, and U8978 only)
Switching the sheet to be displayed

....................................162

......................162

......162

.........................163

.........163

7.8 Viewing Waveforms Divided Into
Blocks

...................................................164

8 Advanced Functions 165

8.1 Adding Comments

Adding, displaying, and printing the title
comment
Adding, displaying, and printing the
channel comments
Entering alphanumeric characters

................................................166

8.2 Displaying Waveforms
Simultaneously
During Writing to the Memory (Roll
Mode)

...................................................173

8.3 Overlaying New Waveforms with
Past Waveforms

8.4 Setting Channels to be Used
(Extending the Recording Length)

8.5 Converting Input Values (Scaling
Function)

Example of scaling settings

..............................................177

8.6 Setting the Waveform Position
(Variable Function)

8.7 Fine-Adjusting Input Values
(Vernier Function)

8.8 Inverting the Waveform (Invert
Function)

..............................................188

8.9 Copying Settings to Other
Channels (Copy Function)

8.10 Setting Details of Units

Settingtheanti-aliasinglter(A.A.F)

Setting the probe voltage dividing ratio

..............................166

..................................167

...........169

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...176

.....................180

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...............................187

................189

......................190

........192

....192

4

Contents

HIOKI MR8848A961-00

Setting the 8967 Temp Unit
Setting the 8969 and U8969 Strain Units
Setting the 8970 Freq Unit
Setting the 8971 Current Unit
Setting the 8972 DC/RMS Unit
Setting the MR8990 Digital Voltmeter
Unit

........................................................199

Setting the U8974 High Voltage Unit
Setting U8977 3CH Current Unit
Setting U8979 Charge Unit
Setting the MR8790 Waveform
Generator Unit
Setting the MR8791 Pulse Generator
Unit

........................................................207

Setting the U8793 Arbitrary Waveform
Generator Unit

........................................205

........................................209

.....................193

......................195

..................198

................198

........200

.............201

.....................202

8.11 Registering Waveforms in the
U8793 Arbitrary Waveform
Generator Unit

....................................212

8.12 Saving Waveforms Registered in
the U8793 onto a Storage Device

8.13 Setting Output Waveform
Parameters on the Waveform
Screen

..................................................215

.194

....215

9.11 Searching the Measured Data
Using the
Trigger Settings

...................................238

10 Numerical Calculation

Function

10.1 Numerical Calculation Procedure

10.2 Setting the Numerical Value
Calculation

Displaying the numerical calculation
results

....................................................248

10.3 Judging the Calculation Results

Displaying the judgment results and
outputting the signals

10.4 Saving the Numerical Calculation
Results

10.5 Printing the Numerical Calculation
Results

10.6 Numerical Calculation Types and
Descriptions

241

....242

...........................................244

.......249

..............................251

.................................................252

.................................................254

.........................................255

9 Setting the Trigger 217

9.1 Setting Procedure

9.2 Setting the Trigger Mode

9.3 Triggering the Instrument Using
Analog Signals

9.4 Triggering the Instrument Using
Logic Signals (Logic Trigger)

9.5 Triggering the Instrument at the

SpeciedTimeoratRegular

Intervals (Timer Trigger)

9.6 Triggering the Instrument
Externally (External Trigger)

9.7 Triggering the Instrument Manually
(Manual Trigger)

9.8 Setting the Pre-trigger

Setting the trigger start point (pre-trigger)
Setting the trigger acceptance (trigger
priority)

...................................................234

9.9 Setting the Trigger Timing

9.10 Setting the Trigger Logical
Connective (AND/OR) Among the
Trigger Sources

...............................218

...................219

....................................220

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........................232

232

.................235

..................................237

11 Waveform Calculation

Function

11.1 WaveformCalculationWorkow

11.2 Waveform Calculation Settings

Displaying the waveform calculation
results

....................................................263

Setting constants
Changing the display method for
calculated waveforms

11.3 Waveform Calculation Operators
and Results

259

......260

........262

....................................265

.............................266

.........................................268

12 Memory Division

Function

12.1 ConguringtheRecordingSettings

12.2 ConguringtheDisplaySettings

271

.273

......274

13 FFT Function 277

13.1 Overview and Features

13.2 OperationWorkow

13.3 Setting the FFT Analysis Conditions

Selecting the FFT function

.....................277

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279

......................279

5

Contents

HIOKI MR8848A961-00

Setting the data source for analysis
(reference data)
Setting the frequency range and number
of analysis points
Decimating and calculating data
Setting the window function

Conguringtheanalysisresultpeak

value setting
Averaging analysis results (waveform
averaging)
Highlighting analysis results (phase
spectra only)

Conguringtheanalysismodesettings

Setting the display range of the vertical
axis (scaling)
Setting and changing analysis
conditions on the waveform screen

13.4 ConguringtheChannelSettings

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....290

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.........295

....296

13.5 ConguringtheScreenDisplay

Settings

Displaying the running spectrum

13.6 Saving Analysis Results

13.7 Printing Analysis Results

................................................298

.............300

....................303

...................304

13.8 Analyzing Waveforms on the
Waveform Screen

Calculating after specifying the
calculation starting point

13.9 FFT Analysis Mode

Analysis modes and display examples
Analysis mode functions

...............................305

..........................305

.............................307

.....307

.........................325

14 Waveform Judgment

Function

14.1 Evaluating Waveforms and Giving
GO/NG Judgments (MEM, FFT
Function)

14.2 Setting the Evaluation Area

Loading the previously created
evaluation area
Creating a new evaluation area

14.3 ConguringtheWaveform

Evaluation Setting

14.4 Setting the Waveform Evaluation
Stopping Conditions

14.5 Create the Evaluation Area

14.6 Details About the Editor Commands

327

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...............330

.......................................330

...............331

..............................332

...........................333

...............335

336

15 Setting the System

Environment

341

16 Connecting the

Instrument to a PC

16.1 Setting LAN and Connecting
the Instrument to the LAN
Network (Before Using FTP/
Internet Browser/Command
Communications)

ConguringtheLANsettingswiththe

instrument
Connecting the instrument to the PC
with the LAN cable

..............................................346

16.2 Controlling the Instrument
Remotely (Using an Internet
Browser)

ConguringtheHTTPsettingswiththe

instrument
Connecting the PC to the instrument
with the Internet browser
Operating the instrument with the
Internet browser

..............................................351

..............................................351

16.3 Accessing Files on the Instrument
from the PC (Using the FTP)

ConguringtheFTPsettingswiththe

instrument
Connecting the PC to the instrument

andmanaginglesusingtheFTP

..............................................358

16.4 Sending Data to a PC Using the
FTP Client Function

ConguringtheFTPserversettingswith

the PC

....................................................361

ConguringtheFTPclientsettingswith

the instrument

16.5 Transferring Data to the PC Using
a USB Cable

16.6 Wave Viewer (Wv)

16.7 ConguringtheUSBSettingsand

Connecting the Instrument to the
Computer (Before Performing
Command Communications)

ConguringtheUSBsettingswiththe

instrument
Connecting the instrument to the PC

..............................................370

16.8 Controlling the Instrument with
Command Communications (LAN/

.....................................................371

USB)

................................346

..................................349

......................................353

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.........................................366

.......................................368

..............................369

345

.........................352

............357

...........359

............370

.......370

6

Contents

HIOKI MR8848A961-00

Setting the instrument

.............................372

16.9 Operating the Instrument Remotely
and Acquiring Data Using 9333
LAN Communicator

...........................373

17 Controlling the

Instrument Externally

17.1 Connection of the External Control
Terminals

17.2 External I/O

External input (START/IN1) (STOP/IN2)
(PRINT/IN3)
External output (GO/OUT1) (NG/OUT2)
External sampling (EXT.SMPL)
Trigger output (TRIG. OUT)
External trigger terminal (EXT.TRIG)

.............................................376

.........................................378

............................................378

.....................383

375

..380

...............381

.......384

18 Specications 385

18.1 GeneralSpecicationsofthe

Instrument

18.2 Common Functions

18.3 Measurement Functions

Memory function
Recorder function
X-Y recorder function
FFT function

18.4 Other Functions

18.5 File

........................................................399

18.6 SpecicationsofModules

8966 Analog Unit
8967 Temp Unit
8968 High Resolution Unit
8969 Strain Unit, U8969 Strain Unit
8970 Freq Unit
8971 Current Unit
8972 DC/RMS Unit
8973 Logic Unit
MR8990 Digital Voltmeter Unit
U8974 High Voltage Unit
U8979 Charge Unit
U8793 Arbitrary Waveform Generator
Unit

........................................................418

MR8790 Waveform Generator Unit
MR8791 Pulse Generator Unit
U8975 4CH Analog Unit
U8977 3CH Current Unit
U8978 4CH Analog Unit

............................................385

............................389

....................391

.....................................391

...................................392

..............................393

...........................................393

..................................394

.................401

....................................401

......................................402

.......................404

.........406

........................................407

...................................409

.................................410

.......................................412

.................412

.........................413

.................................415

..........421

.................422

..........................425

.........................426

..........................428

19 Maintenance and

Service

19.1 Troubleshooting

19.2 Resetting the Instrument

Resetting system settings
Resetting waveform data

19.3 Error Messages

19.4 Self-Test (Self-Diagnostics)

ROM/RAM check
Printer check (when U8351 Printer Unit
is installed)
Display check
Key check

Systemcongurationcheck

19.5 Cleaning

Cleaning the print head (When U8351
Printer Unit is installed)
To clean the instrument and units

19.6 Disposing of the Instrument
(Removing Lithium Battery)

Appendix 451

Appx. 1 Default Values for Major

Settings

Appx. 2 For Reference

Waveformlesize
Referencesofthelesize
Calculationmethodofwaveformlesize
Filesizesofsettingsandimageles

Timebase and maximum recordable time
Maximum recording length and number
of divisions (memory division function)
Scaling method for strain gauges

Appx. 3 Options

Options
9783 Carrying Case
9784 DC Power Unit

Appx.4 FFTDenitions

Appx. 5 Open source software

Index 483

431

..................................433

...................436

.......................436

.........................437

..................................438

...............443

....................................443

.............................................444

.........................................444

...............................................445

.....................446

...............................................447

...........................447

............448

..............449

.........................................451

..............................452

...................................452

.......................452

.454

........455

456

.....458

............459

..........................................461

...................................................461

................................467

...............................468

............................470

................482

7

Contents

HIOKI MR8848A961-00

8

Usage Index

HIOKI MR8848A961-00

Basic measurement procedure

Usage Index

1 Installing the instrument (p. 35)

Installing the instrument

Installing modules

Connecting cords

Loading the recording paper*

Turning on the Instrument

1

2 Setting the instrument (p. 65)

Selecting a function

Setting measurement

settings

Setting input channels

Performing measurement in the automatic
range setting (p. 89)

Monitoring changes in input signals (p. 217)

Manually triggering the instrument (p. 231)

Entering comments (p. 166)

Freely setting the waveform display (p. 77)

Converting input values (p. 177)

Copying settings to other channels (p. 189)

Eliminating noise (Low-pass lter) (p. 83)

Plotting X-Y composite curves (p. 154)

Locking the operation keys (p. 27)

Formatting an SD Card (p. 58)

Scaling measured values obtained with

3 Measuring input signals (p. 86)

Starting measuring input

signals

Completing the measurement

4

Analyzing (p. 145), saving (p. 97) and printing data (p. 133)

Performing analysis

Saving/printing results

(optionally)*

1

current clamp sensors (p. 180)

5 Completing the measurement (p. 61)

Turning o󰀨 the instrument

*1. When the U8351 Printer Unit is installed.

9

Introduction

HIOKI MR8848A961-00

Introduction

Thank you for choosing the Hioki MR8848 Memory HiCorder. To ensure you get the most out of

this instrument over the long term, please read this manual carefully and keep it available for future

reference.

Information on download site

For details on the product application, the update le for the instrument, and the

instruction manual, please check Hioki’s website:

https://cloud.gennect.net/dl

Request for product user registration

This product may be upgraded for improvements or specication changes. We kindly

request that you visit the following link to register your product to receive critical
updates and information about the product:

https://www.hioki.com/global/support/myhioki/registration/

The optional clamps (p. 461) collectively mean “clamp sensors”.

The following instruction manuals are available for this instrument. Refer to the relevant manual as

usage. Please review the separate Operating Precautions before using this instrument.

Name of instruction manual Explanation Supply form

Startup Guide

Instruction Manual

Communication Command
Instruction Manual

U8793, MR8790, MR8791
Instruction Manual

Operation Precautions Information to safely use this instrument Print

Information regarding the safe use of this

instrument and specications (excerpts)

Contains details and specications regarding the

functions and operations of this instrument.

Contains a list of the communication commands
and their explanations to control the instrument
with a computer.

Contains specications and explanations of

functions/operations of the U8793 Arbitrary
Waveform Generator Unit, MR8790 Waveform
Generator Unit, MR8791 Pulse Generator Unit,
and SF8000 Waveform Maker.

Print

PDF

(Download)

HTML

(Download)

PDF

(Download)

Target audience

This manual has been written for use by individuals who use the product or provide information

about how to use the product.

In explaining how to use the product, it assumes electrical knowledge (equivalent of the knowledge

possessed by a graduate of an electrical program at a technical high school).

Trademarks

Excel, Microsoft Edge, and Windows are trademarks of the Microsoft group of companies.

10

Inspecting Package Contents

HIOKI MR8848A961-00

Inspecting Package Contents

Upon receiving the product, inspect it for any damage or anomalies. If you discover any damage

or nd that the product does not perform as indicated in the specications, please contact your

authorized Hioki distributor or reseller.

Instrument and accessories

Conrm that you received the following items:

Instrument

MR8848 Memory HiCorder

Accessories

Startup Guide

Operating Precautions (0990A903)

Input cord label

Power cord

9231 Recording Paper
(When the U8351 Printer Unit is installed.)

Paper Roll Axle
1 pair (When the U8351 Printer Unit is installed.)

Other options as specied in your order

Refer to “Options” (p. 461).

When the 8967 Temp Unit is installed in the instrument

Ferrite clamp-on choke (small)
(2 pieces per unit)

11

Notation

HIOKI MR8848A961-00

Notation

Safety notations

This manual classies the seriousness of risks and hazard levels as described below.

DANGER

WARNING

CAUTION

IMPORTANT

Indicates an imminently hazardous situation that, if not avoided, will result in
death or serious injury.

Indicates a potentially hazardous situation that, if not avoided, could result in
death or serious injury.

Indicates a potentially hazardous situation that, if not avoided, could result in
minor or moderate injury or potential risks of damage to the supported product
(or to other property).

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.
Failure to verify safety or improper handling of the product will result in an
electric shock, a burn, or injury, potentially leading to death.

Indicates prohibited actions.

Indicates mandatory actions.

Symbols a󰀩xed to the instrument

Indicates the presence of a potential hazard. See “Operation Precautions” (p. 15) and
warning messages listed at the beginning of each operating instruction in the instruction
manual, as well as the accompanying document entitled Operating Precautions.

Indicates the On side of the power switch.

Indicates the O󰀨 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 that the product is covered by the Directive on Waste Electrical and Electronic
Equipment (WEEE) in EU member nations. Dispose of the product by local regulations.

Indicates that the product conforms to regulations set out by the EU Directive.

Indicates that the product conforms to Korean regulations.
Declarer: HIOKI KOREA CO., LTD.

http://www.rra.go.kr/selform/HKO-MR8848

12

Other symbols

HIOKI MR8848A961-00

(p. ) Indicates the page number to reference.

Notation

CURSOR

(Bold-faced)

Windows

S/s

*

[ ] Indicates the names of user interface elements on the screen.

Indicates the names of the control buttons.

Unless otherwise specied, “Windows” represents Windows 7, Windows 8, Windows 10, or

Windows 11.

For this product, the number of times the analog input signal is digitized is indicated in
samples per second (S/s).

For example, 20 MS/s (20 megasamples per second) signies 20

Indicates that additional information is described below.

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.

106 samples per second.

×

Accuracy labeling

The accuracy of the measuring instrument is expressed using a combination of the formats shown

below:

• By dening limit values for errors using the same units as measured values.

• By dening limit values for errors as a percentage of the reading, a percentage of the full scale,

and a percentage of the setting.

Reading (display value) Indicates the value displayed on the measuring instrument. Limit values for

reading errors are expressed as a percentage of the reading (% of reading or
% rdg).

f.s. (maximum display
value)

Setting (set value) Indicates the set value, such as voltage and current, that the measuring

Indicates the maximum display value for each range. The maximum display
value for each range is obtained by multiplying the measurement range by 20,
which is the number of divisions on the vertical axis. Limit values for full-scale
errors are expressed as a percentage of the full scale (% of full scale or % f.s.).
Example: For a 1 V/div. range
(Maximum display value) = 1 V/div.

instrument has been congured to output. Limit values for setting errors are

expressed as a percentage of the setting (% of setting).

20 div. = 20 V

×

13

Safety Information

HIOKI MR8848A961-00

Safety Information

The instrument and unit have been designed in accordance with the IEC 61010 safety standard

and has undergone rigorous safety testing prior to shipment. However, using the instrument in a

way not specied in this manual may compromise its 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.

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)

Distribution Panel

The applicable measurement category is determined based on the unit being used.

Refer to “18.6 Specications of Modules” (p. 401).

14

Service Entrance

Service Drop

CAT IV

Power Meter

Internal Wiring

CAT III

Fixed Installation

CAT II

T

Outlet

Operation Precautions

HIOKI MR8848A961-00

Operation Precautions

Before use

Follow these precautions to ensure safe operation and to obtain the full benets of the various

functions.

Ensure that the use of the instrument conforms not only to its specications but also to the
specications of all products to be used, including accessories and optional equipment.

DANGER

If the connection cords 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 cords

are neither ripped nor torn and that no metal parts are exposed. Replace the

connection cords 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 units

Installing the instrument and units 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

• Where it would be unstable or inclined

Ensure enough space for operation around the instrument so that the power

supply can be immediately cut o󰀨 by pulling out the plug of the power cord in

case of emergency.

WARNING

15

Operation Precautions

HIOKI MR8848A961-00

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.

• Do not block any vents.

• Do not install the instrument at an angle.

Left side

Vents

Handling the instrument and units

• Do not use the units or the cords 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 line-to-ground voltage. Take care of the

connection not to allow any input voltage to exceed the maximum rated line-to-

ground voltage.

• To avoid an electric shock, do not remove the instrument’s cover and the units’

cases.

The internal components of the instrument carry high voltages and may

become very hot during operation.

At least 5 cm
on all sides

DANGER

• It is recommended to measure the secondary side of a distribution panel with

the U8974 High Voltage Unit. Do not connect the connection cords on the

primary side of the distribution panel because an unrestricted current ow can

damage the connection cords and facilities if a short-circuit occurs.

16

Operation Precautions

HIOKI MR8848A961-00

WARNING

• Each channel of the U8979 Charge Unit has the BNC terminal and miniature

connector terminal with the common ground. Do not connect cords with each

of the terminals simultaneously to avoid a short-circuit.

• To avoid an electric shock, before removing or replacing an input unit,

conrm that the instrument is turned o󰀨 and that the connection cords are

disconnected.

• To avoid the danger of an electric shock, never operate the instrument with an

input unit removed. To use the instrument with a unit removed, install a blank

panel over the opening of the removed unit.

• To prevent the instrument damage or an electric shock, use only the screws

that are originally installed for securing the unit in place.

If you have lost any screws or nd that any screws are damaged, please contact

your Hioki distributor for a replacement.

• Setting the measurement mode to [PreAmp] allows the U8979 Charge Unit to

constantly provide power (3.0 mA, 22 V) to sensors. Set any measurement

mode other than [PreAmp] or tum o󰀨 the instrument before connecting a

sensor or probe with a BNC terminal to avoid an electric shock or damage to

the measurement target.

CAUTION

• To avoid damaging units, do not touch the connectors, installed in the instrument, to

which the units are connected.

• The U8979 Charge Unit has miniature connectors with the maximum input charge

of ±500 pC (for six higher-sensitivity range) or ±50,000 pC (for six lower-sensitivity

range). Inputting a charge that exceeds these value causes damage to the instrument.

• Use an acceleration sensor with a built-in pre-amplier that conforms to the

specication of the U8979 (3.0 mA, 22 V). Using a inapplicable sensor may cause

damaging itself.

• 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 unit may not perform to

specications, or may even fail.

• Before carrying the instrument, disconnect all cords and remove the SD 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.

• The instrument is classied as a Class A device under the EN 61326 standard.

Use of the instrument in a residential setting such as a neighborhood could interfere with

reception of radio and television broadcasts. If this occurs, take appropriate steps to counteract

the issue.

17

Operation Precautions

HIOKI MR8848A961-00

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.

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

C and 90% RH.

40

°

• 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.

Do not store the paper at
more than 40
and 90% RH.

C (104°F)

°

Avoid exposure to volatile
organic solvents like
alcohol, ethers, and
ketones.

Avoid contact with exible
PVC lms or adhesive

tapes such as scotch
tapes.

Storing recording paper

• Store thermal paper where its temperature will not exceed 40

• The paper will deteriorate if exposed to light for a long time; thus, do not remove the wrapping

18

Avoid stacking with wet
Diazo copy paper.

paper from the roll until it is ready to be used.

C.

°

Handling storage devices

HIOKI MR8848A961-00

• 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 o󰀨 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

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 the SD cards or USB ash drive sold by Hioki.

Compatibility and performance are not guaranteed for SD cards or USB ash drive made by

other manufacturers. You may be unable to read from or save data to such cards.

Hioki optional SD cards and USB ash drive

Z4003 SD Memory Card 8 GB, Z4001 SD Memory Card 2 GB

Z4006 USB Drive 16 GB

Operation Precautions

CAUTION

shock or vibration. Shock can cause it to be

• Turn on the instrument before inserting the external storage device. With some external storage

device, the instrument may not start up if it is turned on while the external storage device is

inserted.

• 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 SD 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 o󰀨 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 o󰀨 for a

long time.

• Devices the automatic data saving supports are the built-in drive (SSD), a USB ash drive, and

an SD card.

• SD Memory Cards, which use ash memory, have a 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.

19

Operation Precautions

HIOKI MR8848A961-00

Before connecting cords

When measuring power line voltage

• Do not short-circuit two wires to be measured by bringing the connection cords

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 cord clips.

• To avoid electrical shock, be careful to avoid shorting live lines with the

connection cord chips.

• Connect the connecting cords 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.

DANGER

WARNING

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.

• 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.

CAUTION

To prevent cord damage, do not step on cords or pinch them between other objects. Do

not bend or pull on cords at their base.

• 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 terminals on units

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.

20

IMPORTANT

• Use only the specied connection cords. Use of any cord 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 units, connection cords, etc.

Before connecting a logic probe to the measurement object

HIOKI MR8848A961-00

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 the 9320-01 Logic Probe and

the 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 di󰀨erent 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 di󰀨erence between the grounds of

the di󰀨erent wiring systems.

To avoid that, we recommend the following connection procedure:

Connect the provided power cord
to the instrument and supply
power from the same outlet as the
measurement object.

Measurement
Object

Logic
Probe

Operation Precautions

Instrument

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
to the GND terminal (functional earth
terminal)” (p. 60).

“Connecting an earthing wire

Before turning on the instrument

• 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.

Measurement
Object

GND

WARNING

CAUTION

Logic
Probe

Instrument

Functional
Earth Terminals

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.

21

Operation Precautions

HIOKI MR8848A961-00

Before connecting the instrument to an external device

DANGER

To avoid electrical hazards and damage to the instrument, do not apply voltage

exceeding the rated maximum to the external control terminals.

I/O terminals Maximum input voltage

Instrument START/IN1 −0.5 V to 7 V DC

STOP/IN2 −0.5 V to 7 V DC
PRINT/IN3 −0.5 V to 7 V DC

GO/OUT1 50 V DC 50 mA 200 mW

NG/OUT2 50 V DC 50 mA 200 mW
EXT.SMPL −0.5 V to 7 V DC

TRIG.OUT 50 V DC 50 mA 200 mW
EXT.TRIG −0.5 V to 7 V DC

U8793
Arbitrary Waveform
Generator Unit

IN −0.5 V to 7 V DC

OUT 30 V DC 50 mA

WARNING

To avoid an electric shock or damage to the equipment, always observe the

following precautions when connecting the cables to external control terminals.

• Always turn o󰀨 the instrument and any devices to be connected before making

connections.

• Be careful to avoid exceeding the ratings of the external control terminals and

the external connectors.

• The external control terminals use the same GND as the instrument. Ensure

that devices and systems to be connected to the external control terminals are

isolated from one another as required.

CAUTION

To avoid equipment failure, do not disconnect the USB cable while communications are

in progress.

• Use a common ground for both the instrument and the connection equipment. Using

di󰀨erent ground circuits will result in a potential di󰀨erence between the instrument’s

ground and the connected equipment’s ground. If the cable is connected while such a

potential di󰀨erence exists, it may result in equipment malfunction or failure.

• Before connecting or disconnecting any cable, always turn o󰀨 the instrument and

the device to be connected. Failure to do so may result in equipment malfunction or

damage.

• After connecting the communications cable, tighten the screws on the connector

securely. Failure to secure the connector could result in equipment malfunction or

damage.

22

Operation Precautions

HIOKI MR8848A961-00

When the instrument is not used for a long period

• To avoid straining some parts of the printer, and to prevent dirt adhering to the print head, close

the printer cover.

• Perform test prints (printer check) three or four times before using the printer that has been in

storage and has left unused for a long period.

Precautions during shipment

Store the packaging materials after unpacking the instrument. Use the original packaging materials

when shipping the instrument.

23

Operation Precautions

HIOKI MR8848A961-00

24

1

HIOKI MR8848A961-00

Overview

1.1 Product Overview

This instrument enables you to measure and analyze various waveforms promptly with simple

methods.

You can use this instrument mainly for facility diagnosis, preventive maintenance, and

troubleshooting.

Sturdy body with

easy-to-grasp handle

installed

You can install this portable instrument anywhere.

Overview

Logic units can measure

signals input on

64 channels

Easy loading of recording paper

High-speed printing

High-speed sampling

20 MS/s

Arbitrary Waveform

Generator Unit can output

waveforms simulating

measured signals

You can take multiple measurements

simultaneously.

(When the U8351 Printer Unit is installed.)

You can load the recording paper through one-

touch operation.

You can conduct reliable response evaluation.

You can have the instrument output realistically

simulated waveforms.

25

Part Names and Functions

HIOKI MR8848A961-00

1.2 Part Names and Functions

Left side

Vents

Right side

U8351 Printer Unit

(Option)
(p. 18)

USB connector (Type B)

Used to connect the PC.
(p. 370)

Front side

SD card slot

Handle

Screen

Operation keys (p. 27)

External control terminals

Input an external sampling
signal. (p. 375)
Connect signal cables to
operate the instrument
externally.

USB connector (Type A)

Connect a USB ash drive or

a mouse. (p. 56)

1000BASE-T connector

Connect a LAN cable.
(p. 345)

Power switch (p. 61)

Flip the switch to turn on and

o󰀨 the instrument.

: Power-on

: Power-o󰀨

GND terminal (Functional
earth terminal)

Connect a grounded
conductor.
(p. 60)

Standard LOGIC
terminals

Connect optional Hioki logic
probes.
(p. 39)

Various units
(p. 36, p. 39)

For more details, see
“8.10 Setting Details of
Units” (p. 190) or “18.6

Specications of Modules”

(p. 401).

Power inlet

Connect the provided power
cord. (p. 60)

Serial number

For the latest information,
check Hioki’s website.
Do not remove this sticker
because the number is
required for product tracking.

26

Operation keys

HIOKI MR8848A961-00

Part Names and Functions

DISP key

Displays the waveform
screen.

CH.SET key

Displays the channel
settings window on the
waveform screen. (p. 77)

TRIG.SET key

Displays the trigger settings
window on the waveform
screen. (p. 217)

F key

Selects setting items.

ESC key

Cancels the last action.
Closes the displayed dialog
and window.

KEY LOCK:

Press and hold the ESC
key for 3 seconds to
engage the key lock
function, which prevents
accidental operation.
Press and hold this key for
3 seconds to disengage
the key lock function.

STATUS key

Displays the status screen.

CHAN key

Displays the channel
screen.

FILE key

Displays the File screen.
(p. 124)

AB CSR key

(Lights up in red when
selected.)

Sets Cursors A and B.
(p. 146)

WAVE key

(Lights up in red when
selected.)

Assigns waveform scrolling
to the jog dial and shuttle
ring. (p. 152)

Inner: Jog dial
Outer: Shuttle ring

Scrolls waveforms display.
(p. 152)
Increases and decreases a
setting value.

(p. 31)

Overview

STOP key

Stops the measurement in
progress.
Press the key once:

Stops the measurement
in progress after the
instrument records the

specied recording

length of waveforms.

Press the key twice:

Immediately stops
the measurement in
progress.

(p. 341)

SYSTEM key

Displays the system
screen.
(p. 341)

CURSOR key

Moves the cursor up, down,

left, and right on the screen.

Manual trigger key

Manually trigger the

instrument.
(p. 231)

START key

Starts measurement.
(Lights up in green during
measurement.)
(p. 341)

27

Part Names and Functions

HIOKI MR8848A961-00

PRINT key

Prints waveforms, le tables, and lists. (p. 133)

COPY key

Prints a screenshot. (p. 143)

FEED key

Feeds paper.

SAVE key (Lights up in blue while the instrument is

accessing a storage device.)

Saves data to a storage device. (p. 97)
The dialog box can be switched between visible and invisible
during auto-saving.

HELP key

Displays help information. (p. 32)

AUTO key

Starts measurement in the auto-range
setting. (p. 89)

TIME/DIV key

Sets the timebase.

28

Screens Conguration

HIOKI MR8848A961-00

1.3 Screens Conguration

The screens are congured as listed below. Pressing each of the keys listed below displays a

corresponding screen or window.

The waveform screen can display the trigger settings window, and the channel settings window.

Waveform screen

The display used to observe waveforms.

Congure measurement conditions using the settings window on the right.

Trigger settings window, channel settings window

The display used to congure the trigger settings.

The display used to congure the settings of analog channels and logic channels.

Status screen

The window used to congure the measurement methods and numerical calculation

settings.

The sheet changes every time the STATUS key is pressed.

[Status] sheet, [Num Calc] sheet, [Memory Div] sheet, and [Wave Calc] sheet.

Overview

Channel screen

The screen used to congure the channel, the scaling, and the comment settings.

Pressing the CHAN key switches the sheet between the following modes:

[Unit List] sheet, [Each Ch] sheet, [Scaling] sheet, and [Comment] sheet.

System screen

The screen used to congure the environment, the le saving, the le printing, and the

interface settings, and to initialize data.

Pressing the SYSTEM key switches the sheets to be displayed in the following order:

[Environment] sheet, [File Save] sheet, [Printer] sheet, [Interface] sheet,

and [Init] sheet.

File screen

The screen used to view saved data les in storage devices (an SD card, the built-in
drive, a USB ash drive, the internal memory).

29

Screens Conguration

HIOKI MR8848A961-00

Display

Waveform screen

Title comment

Shows a previously
entered title
comment. (p. 166)

Trigger time

Shows the date
and time when the
instrument triggered.
(p. 217)

Storage device icon

Displays the status of
storage devices.
(p. 56)

Current date and time

Shows the current date and
time in the manner previously

congured. (p. 62)

Storage counter

Shows the number of times the

Trigger marker

Indicates the point when
the instrument triggered.
(p. 217)

Limit Value

The upper and lower limit
values for each channel
(p. 162)

Vertical axis display

Shows a value per division for each
channel linked to the range settings
of the vertical axis (voltage axis).
(

p. 80

)

instrument triggered. (p. 87)

Logic waveform (p. 84)

Analog waveform(p. 80)

Scroll bar

The red bar indicates the waveform range
written in the memory. The blue frame indicates
the displayed waveform range.

Items common to the status, channel, system, and le screens

Settings cursor

The present
cursor position

ashes.

Settings window

The window

used to congure

measurement
conditions.
(p. 68)

(

p. 152

)

Sheet tabs

Shows names of sheets
that can be selected.
Pressing each of the

MENU keys switches a

sheet to another.

Hint

Shows details about the item at the present settings cursor
position.

Messages and error messages also appear here.

Next Page

Appears when more

than ve setting

items are available.
Pressing this button
switches other
groups of items to be
displayed.

30

1.4 Basic Key Operation

HIOKI MR8848A961-00

Press the CURSOR key and move the cursor to an item to be changed.

1

Basic Key Operation

Cursor

Overview

GUI

2

Check the illustrations on the GUI and press the function key (F key) to change the
settings.

The function assigned to the F key varies depending on the setting items.

To select an item to be set

Press the F key to change settings.

When there are more than ve setting items, press

the F5 [Next Page] key to switch to the next page.

To increase and decrease a setting value

Press the F key to change the setting value.

numerical value at an

Increases a

accelerated rate.

Decreases a

numerical value at an

accelerated rate.

(Turning the jog dial or shuttle ring enables you to

change values.)

3

For some settings, press the CH.SET key to select [Exec], and press the TRIG.SET key
to select [Cancel].

To enter characters and numbers

Refer to “Entering alphanumeric characters” (p. 169).

31

Basic Key Operation

HIOKI MR8848A961-00

Using the HELP key

Pressing the HELP key displays a simple explanation of the item at the cursor position. You can

also search the help messages for the information for which you are looking.

Cursor position help

Move the cursor to the item for which you want to display a help message.

1

Press the HELP key. The [Cursor Pos Help] sheet that contains the help message of

2

the cursor position appears.

Pressing the CURSOR up and down keys or turning the Jog dial scrolls the information.

Cursor

• Pressing the CH.SET key switches the display mode of the [Cursor Pos Help] sheet between the

following modes: The full-screen display, the upper-half display, and the lower-half display. The gure

above illustrates the upper-half display mode.

• The sheet changes every time the HELP key is pressed. (Cursor Pos Help, Help SERCH, and Help

display o󰀨)

32

Basic Key Operation

HIOKI MR8848A961-00

Using mouse to enable key operation

Using a commercially available USB mouse enables you to operate the instrument in the manner

similar to that with the keys on the instrument.

• The instrument may not support some types of mouses.

• Do not connect any type of device other than a mouse or a USB ash drive to the USB connector

of the instrument.

• Operating the instrument with a mouse may cause temporary operating delay or abnormal screen

display.

• While operating the instrument with a mouse, do not change the interface on the system screen

to anything other than “LAN”. Operating the instrument with a mouse is disabled while USB

communications are in progress.

• External noise may cause the instrument to malfunction while it is operated with a mouse. Keep

the mouse and mouse cable as far away as possible from sources of noise.

The gure below illustrates the basic operation of the instrument with a mouse.

Overview

Clicking the left button
(click)

Selects a menu or executes
a selected item. During
measurement with the
memory division engaged,
you can change blocks to be
displayed by double-clicking
the left button.
Click the current path shown
on the File screen to move to
the upper folder in the folder
hierarchy.

Clicking the right button
(right-click)

Displays a menu with a list of
screens.
Dimmed screen items are
unavailable.

Clicking the center wheel

Changes an item to be
selected.
On the File screen, clicking
the center wheel changes

a le to be selected. During

measurement with the
memory division engaged,
you can change blocks to be
displayed.

Move the mouse forward/
backward/leftward/rightward

Moves the mouse cursor on the

screen.

33

Basic Key Operation

HIOKI MR8848A961-00

The operation keys of the instrument and the shortcut menu relate to each other as follows.

To operate the functions assigned to the CH.SET, WAVE, and AB CSR keys and to congure those

settings, click the icons displayed while a mouse is connected to the instrument.

Icon Operation key

CH.SET key

WAVE key

AB CSR key

Useful functionality

Dragging the right button of the mouse (hold down the button, moving the mouse rightward,

leftward, or forward, and then release the button) performs the same function as when pressing the

following keys:

Rightward: START

Leftward: STOP

Upward: ESC

34

2

HIOKI MR8848A961-00

Procedure

Preparing for Measurement

Install the instrument.

1

Install or remove units.

2

(When adding or replacing units)

Connect logic probes to the LOGIC

3

terminals.

(When measuring logic signals)

Connect connection cords to the units.

4

(When measuring analog signals)

Probes and cords di󰀨er depending on the type of
measurement to be performed.

Insert a storage device (SD card, USB

5

ash drive).

Load a roll of recording paper.

6

Connect the power cord.

7

Connect an earthing wire to the GND

8

terminal (functional earth terminal).

(When performing measurement in noisy

environments)

Turn on the instrument.

9

Set the clock.

10

Perform zero-adjustment.

11

Perform calibration.

(For the instrument with the MR8990 installed)

(p. 15)

(p. 36)

(p. 51)

Preparing for Measurement

(p. 39)

(p. 56)

(p. 59)

(p. 60)

(p. 60)

(p. 61)

(p. 62)

(p. 63)
(p. 64)

To operate the instrument with a computer

To control the instrument externally

After preparation terminates, start

measurement. (p. 65)

Refer to “16 Connecting the Instrument to a PC” (p. 345).

Refer to “17 Controlling the Instrument Externally” (p. 375).

35

Installing and Removing Units

HIOKI MR8848A961-00

2.1 Installing and Removing Units

Read “Handling the instrument and units” (p. 16) carefully.
Units ordered with the instrument has already been installed in the instrument. Follow the
procedures below to add, replace, or remove units from the instrument.

• Up to three logic units can be installed. The instrument ignores the fourth logic unit and later units
that are installed in the instrument.

• For information on the analog channel resolution when logic channels are used, refer to “8.10
Setting Details of Units” (p. 190).

The installation of the U8977 3CH Current Unit and the 8971 Current Unit is restricted as follows:

• If three U8977 units are installed: 8971 cannot be installed.

• If two U8977 units are installed: Only one 8971 unit can be installed.

• If one U8977 unit is installed: Up to three 8971 units can be installed.

• If no U8977 units are installed: Up to four 8971 units can be installed.

Installing a unit

Right side

Removing a unit

Knob

(Example: 8966)

Knob

Required items: Phillips-head screwdriver (No. 2)

Turn o󰀨 the instrument.

1

Orient the unit and insert it all the way into the instrument.

2

Make certain that the unit is installed in such a way that the

characters printed on the unit’s panel are right side up about

those printed on the instrument.

Tighten the two unit mounting screws with a Phillips-head

3

screwdriver.

Required items: Phillips-head screwdriver (No. 2)

Turn o󰀨 the instrument.

1

Remove all connection cords and thermocouples

2

connected to the unit.

Remove the power cord.

3

Loosen the two unit mounting screws with a Phillips-head

4

screwdriver.

When not installing another unit after removal

Right side

36

Blank
panel

Pinch the knobs and pull out the unit.

5

Place a blank panel.

1

Tighten the two unit mounting screws with a Phillips-

2

head screwdriver.

If measurement is performed with the instrument without
a blank panel installed, the instrument may fail to meet

specications because of temperature instability within units.

Channel conguration

HIOKI MR8848A961-00

• Units are numbered as Unit 1, Unit 2  , Unit 8, beginning at the top.

• Channels are numbered as CH1, CH2  , beginning at the left of Unit 1.

Channel No.

: 2-channel unit, 3-channel unit, 4-channel unit

: 3-channel unit, 4-channel unit

Installing and Removing Units

UNIT 1

UNIT 2

UNIT 3

UNIT 4

UNIT 5

UNIT 6

UNIT 7

UNIT 8

: 4-channel unit

1 2

3 4

5 6

7 8

9 10

11 12

13 14

15 16

17

19

21

23

25

27

29

31

18

20

22

24

26

28

30

32

Preparing for Measurement

Channel No. (CH1 to CH32)

n = Unit No. (1 to 8)

2-channel unit

CH (2n−1) CH (2n)

3-channel unit

CH (2n−1) CH (2n) CH (2n+15)

4-channel unit

CH (2n−1) CH (2n) CH (2n+16) CH (2n+15)

Logic Unit

LnA [1:4] LnB [1:4] LnD [1:4] LnC [1:4]

You can nd out information about the units installed in the instrument in the System Information
(p. 446).

37

Installing and Removing Units

HIOKI MR8848A961-00

Example channel numbers

When no logic probe is used

1 2

3 4

5 6

7 8

9 10

11 12

17

19

18

20

21

23

When the logic probes only are used

LA

[1:4]LB[1:4]LC[1:4]LD[1:4]

L7A

[1:4]

L7B

[1:4]

L7C

[1:4]

L7D

[1:4]

13 14

15 16

Example channel numbers

• Unit 1/2: 4-channel unit

• Unit 3/4: 3-channel unit

• Unit 5/6: 2-channel unit

• Unit 7/8: 4-channel unit

29

31

30

32

UNIT 7

Example channel numbers

When a logic unit has been installed as

Unit 7

38

Attaching Connection Cords

HIOKI MR8848A961-00

2.2 Attaching Connection Cords

Read “Before connecting cords” (p. 20) carefully.
For detailed precautions and instructions regarding connections, refer to the instruction manuals for
your units, connection cords, etc.

Measuring voltage

Applicable units

• 8966 Analog Unit

• U8975 4CH Analog Unit

• U8978 4CH Analog Unit

• 8968 High Resolution Unit

• 8972 DC/RMS Unit

• U8979 Charge Unit

Connect cables to BNC female
connectors on units.

The following connection cords can be

connected to the units.

• L9197 Connection Cord
(Maximum rated input voltage:
600 V)
Large alligator clip set type

• L9198 Connection Cord
(Maximum rated input voltage:
300 V)
Small alligator clip set type

• L9217 Connection Cord
(Maximum rated input voltage:
300 V)

For measuring output signal

from a BNC connector

• L9790 Connection Cord
(Maximum rated input voltage: 600 V)
Terminal type: Alligator, contact, grabber

Example: Terminal type:

Alligator

Preparing for Measurement

*1. An optional power cord or AC

*2. An optional AC adapter or a

adapter is required.

commercially available USB cable
is required.

• 9166 Connection Cord
(Maximum rated input voltage: 30 V AC, 60 V DC)
Electrical clips

When a voltage to be measured exceeds
rating of a unit being used

• 9322 Di󰀨erential Probe*1

• 9665 10:1 Probe

• 9666 100:1 Probe

• P9000-01/-02 Di󰀨erential Probe*2

Example: P9000-02 Di󰀨erential Probe

a

maximum input

39

Attaching Connection Cords

HIOKI MR8848A961-00

Connecting cables to the BNC female terminals on units

Example: 8966 Analog Unit

BNC female
connector

Connecting the cord

BNC connector
slots

Lock

Locking studs of
unit side

Connect the logic probe to a

measurement object.

Required item: Connection cord

Connect the BNC male connector of

1

the cord to a BNC female connector
on the unit.

Align the slots in the BNC male

2

connector with the bayonet lugs on
the BNC female connector on the
unit, then attach the male connector
while turning it clockwise until it
locks.

Connect the cord clips to a

3

measurement object.

To disconnect the connection cable from

the BNC female connector

Turn the BNC male connector
counterclockwise, then pull it out.

40

Attaching Connection Cords

HIOKI MR8848A961-00

Measuring frequency, number of rotations, and count

Refer to (p. 40) for details about connecting a cable to the BNC female terminal.

Applicable unit

• 8970 Freq Unit

Connect cables to BNC female
connectors on units.

The following connection cords can be

connected to the units.

• L9197 Connection Cord
(Maximum rated input voltage:
600 V)
Large alligator clip set type

Preparing for Measurement

• L9198 Connection Cord
(Maximum rated input voltage:
300 V)
Small alligator clip set type

• L9217 Connection Cord
(Maximum rated input voltage:
300 V)

For measuring output signal

from a BNC connector

• L9790 Connection Cord
(Maximum rated input voltage: 600 V)
Terminal type: Alligator, contact, grabber

Example: Terminal type:

Alligator

*1. An optional power cord or AC

adapter is required.

*2. An optional AC adapter or a

commercially available USB cable is
required.

When a voltage to be measured exceeds
rating of a unit being used

• 9322 Di󰀨erential Probe*1

• P9000-01/-02 Di󰀨erential Probe*2

Example: P9000-02 Di󰀨erential Probe

a

maximum input

41

Attaching Connection Cords

HIOKI MR8848A961-00

Measuring temperature

K and E thermocouples exhibit a phenomenon known as short range ordering. This prevents
accurate measurement at temperatures from 250°C to 600°C.
Consult your thermocouple manufacturer to choose appropriate sensors.

Applicable unit

• 8967 Temp Unit
Thermocouple

(Compatible wire: from 0.4 mm to

1.2 mm in diameter)

Connect a thermocouple to the terminal
block on the unit.

The following thermocouple can be

Connecting thermocouples to the terminal blocks

Required items:

Thermocouple, at-blade screwdriver (2.6 mm blade)

Recommended wire:
Compatible wire: Thermocouple element wires from

0.4 mm to 1.2 mm in diameter
Strip length: 10 mm

Strip the insulation of the thermocouple

1

wires as shown on the left.

Length: Approx. 10 mm

Outer

insulation

25 mm

Inner

insulation

Terminal block

10 mm

1

Thermocouple
element wire1

connected to the unit.

Connect thermocouple

to terminal block

Depress the button on the terminal block

2

Connecting a thermocouple

Connection holes

3

2

4

Connect the thermocouple to a

5

measurement object

• If there are noise e󰀨ects from/on surrounding equipment, wind the
thermocouple around the ferrite clamp-on choke, which is an accessory of
8967, several times (as seen in the right diagram).

• When connecting the thermocouple that is more than 3 meters long, the
measurement may be a󰀨ected by EMC environments including external noise.

on the unit with the at-blade screwdriver.

Insert each thermocouple wire into the

3

appropriate terminal hole while depressing
the button.

The color of the cable insulation varies
depending on the country and manufacturer.
Check the insulation color before connecting.

Release the screwdriver from the button.

4

The thermocouple is connected to the terminal
block.

Connect the thermocouple to a

5

measurement object.

To remove the thermocouple

Pull the thermocouple wire while depressing the button.

42

Attaching Connection Cords

HIOKI MR8848A961-00

Measuring vibration or displacement with a strain gauge transducer

Applicable units

• U8969 Strain Unit

• 8969 Strain Unit

Connect a strain gauge transducer to a connector on the U8969 Strain Unit via the L9769
Conversion Cable; the 8969 Strain Unit via the 9769 Conversion Cable.

The following device can be connected to the unit.
Strain gauge transducer (Not available from Hioki)

Connect L9769 or 9769 Conversion Cable to the strain gauge
transducer.

Connecting the strain gauge transducer to a unit’s connector

Example: Connecting the strain gauge transducer to the U8969 Strain Unit via the L9769



Conversion Cable

Required items:

L9769 Conversion Cable, strain gauge

transducer

Insert the L9769 into a connector of

1

the U8969 with the slot of the plug
aligned with the outward indentation
of the connector.

Insert the plug into the connector

2

until they are locked together.

Connect the L9769 to the strain

3

gauge transducer.

Connector’s

indentation

U8969 Strain Unit

1

Connect the L9769.

Plug’s slot

2

Preparing for Measurement

Connect the L9769 to the strain gauge

3

transducer.

Connect the strain gauge transducer to

4

a measurement object.

The instrument describes the U8969 as “8969”.

Connect the strain gauge transducer

4

to a measurement object.

How to disconnect the L9769

Pull the sleeve of the plug gently,

releasing the plug, and disconnect the

cable.

43

Attaching Connection Cords

HIOKI MR8848A961-00

Connector pin-out

U8969 Strain Unit

The metal shell is connected to the GND
of the instrument.

Pin mark Description

A BRIDGE+

B INPUT-

C BRIDGE-

D INPUT+

E

F SENSE+

G SENSE-

H, J N.C.

FLOATING COMMON

L9769 Conversion Cable

(Strain gauge transducer end)

A F

G

B

C D

The metal shell is connected to the GND
of the instrument.

Pin mark Description

A BRIDGE+, SENSE+

B INPUT-

C BRIDGE-, SENSE-

D INPUT+

E

F, G N.C.

Applied voltage:

E

bridge voltage of 2 V

FLOATING COMMON

Connection of the L9769

• Pin F of the unit end is connected with Pin A of the strain gauge transducer end.

• Pin G of the unit end is connected with Pin C of the strain gauge transducer end.

44

Attaching Connection Cords

HIOKI MR8848A961-00

Example: Connecting the strain gauge transducer to the 8969 Strain Unit via the 9769 Conversion



Cable

8969 Strain Unit Required items:

9769 Conversion Cable, strain gauge

transducer

Connect the 9769 to a connector on

1

the unit.

1

Connect the 9769.

Insert the connector of the 9769 with the
orange part facing upward.

Connect the 9769 to the strain gauge

2

transducer.

Connect the strain gauge transducer

3

to a measurement object.

Connect the L9769 to the strain

2

gauge transducer.

Connect the strain gauge

3

transducer to a measurement
object.

Preparing for Measurement

Connector pin-out

(Pin 1 is on the left when the

unit’s top side is on the up)

Pin No. Description

1 BRIDGE+

2 SENSE+

3 INPUT+

4 INPUT-

5 BRIDGE-

6 SENSE-

7

8969 Strain Unit

1 2 3 4 5 6 7

FLOATING COMMON

9769 Conversion Cable

(Strain gauge transducer end)

A F

G

B

C D

The metal shell is connected to the GND

Pin mark Description

A BRIDGE+, SENSE+

B INPUT-

C BRIDGE-, SENSE-

D INPUT+

E

F, G N.C.

Applied voltage:

E

bridge voltage of 2 V

of the 8969.

FLOATING COMMON

IMPORTANT

• Preforming measurement with a strain gauge requires a bridge box. Use a strain gauge and bridge
box both of which are commercially available.

• The bridge box may be susceptible to the e󰀨ect of noise. In this case, connect an earthing wire to the
bridge box to reduce the e󰀨ect of noise. For more information about how to ground the bridge box,
refer to its instruction manual or contact the manufacturer of the bridge box.

• Do not excessively bend the cable and the base between cable and connector, pull on them, nor twist
them. Doing so may cause the conversion cable to break.

45

Attaching Connection Cords

HIOKI MR8848A961-00

Measuring current

There is a limitation on the number of Current Units that can be installed.
Refer to “2.1 Installing and Removing Units” (p. 36).

Current sensors that can be connected to current units

The following current sensors can be connected to the U8977 3CH Current Unit and the 8971
Current Unit. Use of conversion cables may be required depending on sensors and units.



: Directly connectible

Model

number

9709

9709-05

9272-05

9272-10 CT9900 9318 Plastic

CT6830 AC/DC Current Probe

CT6831 AC/DC Current Probe

CT6833
CT6833-01

CT6834
CT6834-01

CT6841

CT6841-05
CT6841A

CT6843
CT6843-05

CT6843A
CT6844
CT6844-05

CT6844A
CT6845
CT6845-05

CT6845A
CT6846
CT6846-05

CT6846A
CT6862

CT6862-05

CT6863

CT6863-05

CT6865

CT6865-05

CT6875
CT6875A
CT6875A-1

Model name

AC/DC Current Sensor

Clamp on Sensor

AC/DC Current Probe

AC/DC Current Probe

AC/DC Current Probe

AC/DC Current Probe

AC/DC Current Probe

AC/DC Current Probe

AC/DC Current Probe

AC/DC Current Sensor

AC/DC Current Sensor

AC/DC Current Sensor

AC/DC Current Sensor

Maximum

input current /

Frequency

500 A

DC to 100 kHz

20 A/200 A

1 Hz to 100 kHz

2 A

DC to 100 kHz

20 A

DC to 100 kHz

200 A

DC to 50 kHz

500 A

DC to 50 kHz

20 A

DC to 1 MHz

200 A

DC to 500 kHz

500 A

DC to 200 kHz

500 A

DC to 100 kHz

1000 A

DC to 20 kHz

50 A

DC to 1 MHz

200 A

DC to 500 kHz

1000 A

DC to 20 kHz

500 A

DC to 2 MHz

Conversion

cable for

U8977

CT9900 9318 Plastic













CT9900 9318 Plastic



CT9900 9318 Plastic



CT9900 9318 Plastic



CT9900 9318 Plastic



CT9900 9318 Plastic



CT9900 9318 Plastic



CT9900 9318 Plastic



CT9900 9318 Plastic





Conversion

cable for 8971

CT9901

+ 9318

CT9901

+ 9318

Not

connectible

Not

connectible

CT9901

+ 9318

CT9901

+ 9318

CT9901

+ 9318

CT9901

+ 9318

CT9901

+ 9318

CT9901

+ 9318

CT9901

+ 9318

CT9901

+ 9318

CT9901

+ 9318

CT9901

+ 9318

CT9901

+ 9318

Connector*

Metal

Metal

Metal

Metal

Metal

Metal

Metal

Metal

Metal

Metal

Metal

Metal

Metal

Metal

Metal

1

46

Attaching Connection Cords

HIOKI MR8848A961-00

Model

number

CT6876
CT6876A
CT6876A-1

CT6877
CT6877A
CT6877A-1

CT6872
CT6872-01

CT6873
CT6873-01

CT6904A AC/DC Current Sensor

CT6904A-1 AC/DC Current Sensor

CT6904A-2 AC/DC Current Sensor

CT6904A-3 AC/DC Current Sensor

*1. Metal connector (ME15W), plastic connector (PL23)

Model name

AC/DC Current Sensor

AC/DC Current Sensor

AC/DC Current Sensor

AC/DC Current Sensor

Maximum

input current /

Frequency

1000 A

DC to 1.5 MHz

2000 A

DC to 1 MHz

50 A

DC to 10 MHz

200 A

DC to 10 MHz

500 A

DC to 4 MHz

500 A

DC to 2 MHz

800 A

DC to 4 MHz

800 A

DC to 2 MHz

Conversion

cable for

U8977

















Conversion

cable for 8971

CT9901

+ 9318

Not

connectible

CT9901

+ 9318

CT9901

+ 9318

CT9901

+ 9318

CT9901

+ 9318

CT9901

+ 9318

CT9901

+ 9318

Connector*

Metal

Metal

Metal

Metal

Metal

Metal

Metal

Metal

1

Preparing for Measurement

Connecting current sensors to the 8971 Current Unit

Current sensors with a black resin connector (PL23), can be connected to the 8971 using the
optional 9318 Conversion Cable*.

*: The 9318 Conversion Cable is an accessory of the 8971 Current Unit.

8971 Current Unit

9318 Conversion
Cable

Aligning the guides of the conversion cable

1

with those of the sensor connector on the unit,
and straightly insert the plug until it locks.

Align the guides of the current sensor to be used

2

with those of the conversion cable connector,
and straightly insert the plug until it locks.

The instrument automatically recognizes the model of
the current sensor.

Clamp the current sensor around a line of a

3

measurement target.

How to disconnect the current sensor

Hold and pull the plastic collar of the

1

conversion cable, which releases the lock, and
the remove the connector.

When measuring current with the 9018-50 Clamp on Probe

Hold and pull the plastic collar of the current

2

sensor, which releases the lock, and the
remove the connector.

Using the 9018-50 enables voltage measurement units such as the 8966 Analog Unit to measure current.
For more information about how to congure the instrument for use in this type of application, refer
to “Example of scaling settings” (p. 180).

47

Attaching Connection Cords

HIOKI MR8848A961-00

Connecting current sensors to the U8977 3CH Current Unit

Current sensors with metal connectors (ME15W) can be connected directly.

Orient so that the wide ridge is
positioned at the top of the instrument.

Grip the metal part
of the connector.

Current sensors with a black resin connector (PL23) can be connected to the U8977 using the
optional CT9900 Conversion Cable.

Align the connector guides.

1

Push the connector straight in until it locks.

2

Grip the connector by the non-metal part and push it in.
The instrument automatically recognizes the model of
the current sensor.

How to disconnect the current sensor

Grip the connector’s metal part and slide it

1

towards you to disengage the lock.

Pull the connector towards you.

2

CT9900 Conversion
Cable

If the CT6846 or CT6865 (1000 A rating) is connected using the CT9900 Conversion Cable, it will be
recognized as a 500 A AC/DC sensor. Set the CT ratio to 2.00.
Current sensors in the CT7000 series can be connected to the U8977 3CH Current Unit using
the optional CT9920 Conversion Cable. When using the CT9920, sensors will not be recognized
automatically.
Select the supported mode on the settings screen.
Supported models:

48

CT7631, CT7636, CT7642, CT7731, CT7736, CT7742, CT7044, CT7045, CT7046

CT9920 Conversion Cable

Current sensor side

Attaching Connection Cords

HIOKI MR8848A961-00

Measuring acceleration

Familiarize yourself with “Handling the instrument and units” (p. 16) before connecting a current
sensor.

Applicable unit

• U8979 Charge Unit

Connect a acceleration sensor to the U8979 Charge Unit.

The following device can be connected to the unit.
Acceleration sensor (Not available from Hioki)

Acceleration sensor connectable with the U8979

CAUTION

Use an acceleration sensor with a built-in pre-amplier that conforms to the specication
of the U8979 Charge Unit. Using a inapplicable sensor may cause damaging itself.

Acceleration sensor type Terminal the sensor is connected to Note

With a built-in pre-amplier BNC connector Drive power: 3.0 mA, 22 V

Charge output Miniature connector (#10-32) –

Connecting an acceleration sensor with a built-in pre-amplier

Connecting a BNC-output acceleration sensor with a built-in pre-amplier

Preparing for Measurement

U8979 Charge Unit

BNC connector slots

Lock

Locking studs of

unit side

Connecting an acceleration sensor other than a sensor with a built-in pre-amplier

Convert the output connector into the BNC connector using a commercially available conversion
connector or conversion cable to connect the sensor.

Align the slots in the BNC connector of an

1

acceleration sensor with the locking studs of
a BNC connector on the unit, and insert the
connector.

Turn the BNC connector of the acceleration

2

sensor clockwise until it locks.

Attach the acceleration sensor with the built-in

3

pre-amplier to a measurement target.

How to disconnect the acceleration sensor

Turn the BNC connector of the acceleration sensor
counter-clockwise to release the lock and remove the
connector.

49

Attaching Connection Cords

HIOKI MR8848A961-00

Connecting a charge-output acceleration sensor

Connecting a charge-output acceleration sensor equipped with the miniature connector
(#10-32)

U8979 Charge Unit

Tighten the screw.

Connecting a charge-output acceleration sensor equipped with a connector other than a
miniature connector (#10-32)

Convert the output connector into the miniature connector (#10-32) using a commercially available
conversion connector or conversion cable to connect the sensor.

Align the screw of the miniature connector, and

1

turn the connector clockwise to tighten it.

Attach the charge-output acceleration sensor

2

to a measurement target.

How to disconnect the charge-output acceleration
sensor

Turn the miniature connector counterclockwise, and then
pull out the connector.

50

Attaching Connection Cords

HIOKI MR8848A961-00

Measuring logic signals

Read “Before connecting a logic probe to the measurement object” (p. 21) carefully.
For more information about logic probe specications, refer to the instruction manual of your logic
probe.

Applicable unit

• 8973 Logic Unit

• 9320-01 Logic Probe

• MR9321-01 Logic Probe

• 9327 Logic Probe

The logic channels LA through LD are
installed in the instrument.

The following logic probes can be

Connecting logic probes to the logic terminals

Example: Connecting the 9327 Logic Probe

Right side

Required items:

9327 Logic Probe

1

LOGIC terminals

2

1

connected to the unit.

LOGIC terminals

Preparing for Measurement

Aligning the plug slots of the logic
probe with a logic terminal, insert the
logic probe plug.

Connect the logic probe to a
measurement object.

Connect the

2

logic probes to
measurement objects.

51

Attaching Connection Cords

HIOKI MR8848A961-00

Measuring voltage with a high degree of accuracy (digital voltmeter)

Applicable unit

• MR8990 Digital

Voltmeter Unit

Connect the test lead to the banana
terminals on the unit.

The following lead can be connected to the unit.

• L2200 Test Lead
(Maximum rated input
voltage: 1000 V)

Connecting test leads to the banana terminals

Connect the test leads

Banana
terminals

1

BlackRed

Required items: Test leads mentioned
above

Connect the test leads to the banana

1

terminals on the unit.

Connect the black lead to the L terminal;
and the red lead to the H terminal. Make
sure the test lead plugs are fully inserted
in the terminals.

Connect the test lead to a

2

measurement object.

Connect the test leads to a

2

measurement object.

52

Measuring high voltage

HIOKI MR8848A961-00

The following cables can be connected to the unit.

Applicable unit

• U8974 High Voltage Unit

Connect the connection cable to the
banana terminals on the unit.

Connecting connection cables to the banana terminals

Connect the connection cable

Banana
terminals

• L4940 Connection Cable Set
(Maximum input voltage: 1000 V)

Required items: L4940 Connection Cable
Set

Connect the plugs of the connection

1

cord to banana terminals on the unit.

Connect each of the plugs to the banana
terminal in the same color.

Attaching Connection Cords

Preparing for Measurement

+

1

BlackRed

Connect the clips.

2

Accessory clips

L4934L4932

Insert accessory clips into another

2

side of the cord.

Connect the cord clips to a

3

measurement object.

1

L4934*
*1. The L4932 is required to use the

L4935 Alligator Clip Set

L9243 Grabber Clip

L4936 Bus Bar Clip Set

Small Alligator Clip Set

L4934.

Connect the clips

3

to a measurement
object.

L4937 Magnetic Adapter Set

L4932 Test Pin Set

53

Attaching Connection Cords

HIOKI MR8848A961-00

Outputting waveforms

Applicable units

• U8793 Arbitrary Waveform
Generator Unit

• MR8790 Waveform Generator Unit

Connect the connection cable to the SMB
terminal of a unit.

The following cables can be connected to the unit.

• L9795-01 Connection Cable (Electrical clips)

• L9795-02 Connection Cable (BNC output)

Connecting a connection cable to the output terminals

Example: U8793

Output terminal

Required item: Connection cable mentioned above

Insert the SMB connector of connection cable

1

in the output terminal of the unit until it clicks.

Connect the cable clips to an object to which

2

Connect the connection cable

the instrument applies the waveform.

Output terminal

SMB connector

Connect the connection cable to

2

an object to which the instrument
applies the waveform.

1

To disconnect output connectors

Firmly pinch the head of the SMB connector (other than
the cable), and pull it out.

54

Outputting a pulse waveform

HIOKI MR8848A961-00

Attaching Connection Cords

Applicable unit

• MR8791 Pulse Generator Unit

The following cable can be connected to the unit.

Commercially available cable

(Half-pitch 50 pins)

Connecting a connection cable to the output connector

Output connector

Required items: Commercially available cable

Connect the connection cable to the output

1

connector of the unite.

Connect the connection cable to the object to

2

Connect the connection cable

Output connector

1

Buttons

which the instrument applies the waveform.

To disconnect output connectors

Pull the connector while depressing the buttons of the
connection cable.

Preparing for Measurement

Connection cable connector

Connect the connection cable to

2

an object to which the instrument
applies the waveform.

Output connector

10250-52A2PL: Sumitomo 3M products (SCSI-2 connector), (Centronics half-pitch 50 pins socket-

contact)

Refer to “Specications of output connector” (p. 424).

• The metal shell of the connector 10250-52A2PL has the same potential as the ground of the
instrument (frame ground).

• Use a lock-type connector for connecting a wire harness and the connector.

55

Preparing Storage Devices

HIOKI MR8848A961-00

2.3 Preparing Storage Devices

Read “Handling storage devices” (p. 19) carefully.

Available storage devices (inserting an SD card and a USB ash drive)

Storage device icon

The icons indicating the status of storage devices always appear at
the top of the screen.

USB
ash

drive

SD card Built-in

drive

Storage devices are inserted.

Storage devices are inserted and selected as the

save destination. (Shown in red)

Storage devices are not inserted, however, they are
selected as the save destination. (Shown in black)

Storage device How to insert devices, notes

Insert an SD card

Fully insert an SD card with the top facing

upward and the mark (p) pointing toward

the slot.

SD card

SD card slotFront side

Built-in drive

Memory (INT)

(RAM)

To remove the SD card

Fully insert the SD card. When the SD card pops out of the slot, pull it out.

U8334 Internal Storage (storage capacity: 1 TB*, 1 TB = 1,000,000,000,000 bytes)
* After formatting the drive, its capacity is decreased to less than 1 TB, which is an
actually available capacity.

The optional U8334 Internal Storage (factory option) is required.
The hard disk has been formatted to the factory-default settings during the production
process.

• The memory installed in the instrument is available. Only settings les can be written in
the memory.

• Automatic writing of data is not possible.

56

Storage device How to insert devices, notes

HIOKI MR8848A961-00

• Do not connect any devices other than USB ash drives.

• The instrument does not support all commercially available USB ash drives.

• To use a USB ash drive, you have to congure the setting on the instrument. See the

procedure described on the following page.

Preparing Storage Devices

Inserting a USB ash drive

Orient the USB ash drive and insert it all the
way into the connector.

USB Stick

Removing the USB ash drive

Make sure that the instrument is not

accessing the USB ash drive (for saving
or loading data, etc.), and then remove the
USB ash drive.
No operation is required on the instrument.

Right side

USB connector
(Type A)

Depending on the intended use of the USB ash drive, connector types and settings on the
instrument di󰀨er.

USB usage

Using a USB ash drive Type A LAN USB ash drive “Procedure”

Connector

Instrument settings

Interface USB setting

Reference

information

(p. 57)

Preparing for Measurement

Retrieving les saved on an SD card or
the built-in drive with a computer (via a
USB cable)

Operating the instrument from a computer
(via a USB cable)

Type B LAN Mass storage SSD,

Mass storage SD

Type B USB Interface p. 370

p. 368

Procedure

To display the screen: Press the SYSTEM key several times to display the [Interface] sheet on the system screen.

1 2

Move the cursor to the [Interface] box, and select [LAN].

1

Move the cursor to the [USB Set] box, and then select [USB Stick].

2

57

Preparing Storage Devices

HIOKI MR8848A961-00

Formatting storage devices

The instrument can format SD cards, USB ash drives, the built-in drive, and the internal memory.
Once they are formatted, the [HIOKI_MR8848] folder is created.

Note that formatting a storage device deletes all the information on the storage device, and the
deleted information is unrecoverable.

Procedure

To display the screen: Press the FILE key to display the le screen.

Insert a storage device.

1

Select [Next Page].

2

Select [Format].

The cursor is placed on the [Format Target] box.

Select a storage device to be formatted, and then select

3

[Exec].

The specied storage device is formatted.

A conrmation window is displayed. Select [YES] to proceed
the formatting action.
Select [No] to cancel the formatting action.

58

Loading Recording Paper (When U8351 Printer Unit is Installed)

HIOKI MR8848A961-00

2.4 Loading Recording Paper (When U8351 Printer Unit is Installed)

Read “Handling the printer and the recording paper” (p. 18) carefully.

Procedure

Required items: 9231 Recording Paper, Paper roll axles
(accessory)

Press the button to open the printer cover.

1

Preparing for Measurement

Paper roll axle

Insert the paper roll axles into the core of the 9231

2

Recording Paper.

Put the paper into the holder.

3

Insert rst the left side of the paper into the holder, and then, until

the holder clicks, put the paper into the holder while pressing the

paper leftward.

Face the print side of the paper upward. Printing is not
possible if the front and back of the recording paper are
reversed.
If the recording paper is put in the holder without the
paper roll axle installed, the printer cover cannot be open,
resulting in damage to the printer.

Pull out the edge of the paper toward yourself, and

4

close the printer cover while applying the face of the
paper to the cover’s side surface.

The surface of the paper may become sticky due to the
residue left behind by the adhesive tape, with the result
that the printing on that area becomes unprintable. Unroll
approximately the rst 200 mm of paper before inserting it
into the printer.

How to withdraw the recording paper

As shown in the left gure, withdraw the paper while pressing the
paper roll axle leftward.

59

Supplying Power

HIOKI MR8848A961-00

2.5 Supplying Power

Read “Before turning on the instrument” (p. 21) carefully.

Connecting the power cord

Procedure

Connect the power cord to the power inlet on the instrument.

1

Plug the power cord into the mains outlet.

2

Right side

1

Connecting an earthing wire to the GND terminal (functional earth terminal)

When performing measurement in a noisy environment, you can
improve the noise immunity by connecting an earthing wire to the GND
terminal (functional earth terminal).

When using a potential transformer (PT) for AC power line measurement
or others, connect an earthing wire to the GND terminal of the PT.

Right side

60

Turning on and o󰀨 the instrument

HIOKI MR8848A961-00

Turning on the Instrument

Supplying Power

Right side

Power switch

: On

Before starting measurement

To perform precise measurement, warm up the instrument about 30 minutes after turning on the
instrument to stabilize the internal temperature of the units. After warm-up, perform zero adjustment
before performing measurement.

Set the power switch in the on position ( ).

The splash screen is displayed rst, and then the
waveform screen is displayed.

Turning o󰀨 the instrument

Before turning o󰀨 the instrument

When the instrument is turned o󰀨, data recorded in the internal memory is deleted. When you do
not want to lose recorded data, save it rst to an SD card or an external storage device.
Refer to “5 Saving/Loading Data and Managing Files” (p. 97).

Right side

Set the power switch in the o󰀨 position ( ).

Preparing for Measurement

Power switch

: O󰀨

The instrument is turned o󰀨.
After the instrument is turned on again, the display is
displayed with the same settings as when the instrument
was turned o󰀨 last time.
When the auto-setup function is enabled, settings are
read and congured automatically. (p. 123)

61

Setting the Clock

HIOKI MR8848A961-00

2.6 Setting the Clock

Set date and time for the built-in clock as follows.
The clock has an automatic calendar with leap year correction and 24-hour format.
The functions listed below make use of the clock. Ensure that the clock is set correctly before using
these functions.

• Performing measurement with timer-based trigger enabled

• Printing data including times of trigger events

• Saving measured data

Procedure

To display the screen: Press the SYSTEM key several times to display the [Init] sheet on the system screen.

Move the cursor to the [Clock] box.

1

Select the digits to change and set the

2

numeric values.

While the cursor is placed on one of the

3

[Clock] settings, select [SET].

The date and time settings are accepted.
The date and time are displayed at the top
right of the screen.

Date setting

(Year, month, day)

Time setting
(Hour, minute, second)

62

Adjusting the Zero Position (Zero-Adjustment)

HIOKI MR8848A961-00

2.7 Adjusting the Zero Position (Zero-Adjustment)

This operation compensates potential deection of units and sets the reference potential of the
instrument to 0 V.
The compensation operation is performed for all channels and ranges.

Before performing zero-adjustment

• Warm up the instrument for about 30 minutes after the power-on to stabilize the internal
temperature of the units, and then perform zero-adjustment.

• Note that zero-adjustment cannot be performed during measurement.

• Key operation is not accepted during zero-adjustment.

• The time required for zero-adjustment varies depending on types and the number of units

installed in the instrument. (The operation may take several seconds.)

Procedure

To display the screen: Press the CHAN key several times to display the [Unit List] sheet on the channel screen.

Preparing for Measurement

Move the cursor to the [Zero-Adjust] box.

1

Select [Execute Zero-Adjust].

2

The zero-adjustment is executed.

Zero-adjustment has no e󰀨ect on the 8969 and U8969 Strain Unit.
Adjust the zero position using the auto-balance. (p. 194)

Perform zero-adjustment in the following cases.

• When a unit has been replaced

• When the instrument has been cycled

• When settings has been initialized (system reset)

• When measurement mode has been switched between DC and RMS on the 8971 Current Unit,

8972 DC/RMS Unit, or U8974 High Voltage Unit

• When measurement mode has been switched on the U8979 Charge Unit

• When the ambient temperature has changed signicantly

1

• The zero-position drift*

may occur.

*1. Drift: A spurious output caused by a shift in an operating point of an operational amplier. Drift

can occur due to changes in temperature and due to component aging over a period of
use.

63

Performing Calibration (When MR8990 is Installed)

HIOKI MR8848A961-00

2.8 Performing Calibration (When MR8990 is Installed)

This operation calibrates the scale of MR8990 Digital Voltmeter Unit.
The compensation operation is performed for all channels and ranges.

Before performing calibration

• Warm up the instrument for about 30 minutes after the power-on to stabilize the internal
temperature of the units, and then perform zero-adjustment.

• Note that calibration cannot be performed during measurement. However, when the calibration
setting is set to on, calibration is performed at the start of measurement.

• Key operation is not accepted during calibration.

• The time required for calibration varies depending on types and number of units installed in the

instrument. (The operation may take several seconds.)

Procedure

To display the screen: Press the CHAN key several times to display the [Unit List] sheet on the channel screen.

Move the cursor to the [Zero-Adjust] box.

1

Select [Execute Zero-Adjust].

2

Calibration is executed.

In the following cases, calibration should be executed again.

• When a unit has been replaced

• When the instrument has been cycled

• When settings has been initialized (system reset)

• When the ambient temperature has changed signicantly

64

3

HIOKI MR8848A961-00

Measurement

3.1 Measurement Procedure

1 Inspecting the instrument before measurement

Refer to
“3.2 Inspecting the Instrument Before Measurement” (p. 67).

2 Conguring the basic measurement settings

Refer to the following pages:

Select a suitable recording method for an object
to be measured

Set the sampling rate

Set the recording length

Set the waveform display format and printing
format

Advanced settings

Refer to the following pages:
“7.4 Plotting X-Y Composite Curves” (p. 154)
“8.2 Displaying Waveforms Simultaneously
During Writing to the Memory (Roll Mode)” (p. 173)
“8.3 Overlaying New Waveforms with Past Waveforms” (p. 174)
“10 Numerical Calculation
Function” (p. 241)

“Measurement functions” (p. 68)

“Timebase and sampling rate” (p. 70)

“Recording length (number of divisions)”
(p. 73)

“Screen layout” (p. 76)

3 Conguring Input Channels Settings

Refer to the following pages:

Congure the analog channel settings

“Analog channel settings” (p. 80)

Measurement

Congure the logic channel settings

Advanced settings

Refer to the following pages:
“8.1 Adding Comments” (p. 166)
“8.5 Converting Input Values (Scaling Function)” (p. 177)
“8.6 Setting the Waveform Position (Variable Function)” (p. 184)
“8.7 Fine-Adjusting Input Values (Vernier Function)” (p. 187)
“8.8 Inverting the Waveform (Invert Function)” (p. 188)

4 Conguring the trigger settings

Refer to
“9 Setting the Trigger” (p. 217).

“Logic channel settings” (p. 84)

65

Measurement Procedure

HIOKI MR8848A961-00

5 Starting measurement

Refer to the following pages:
“3.5 Starting and Stopping Measurement” (p. 86)
“5 Saving/Loading Data and Managing Files” (p. 97)
“6 Printing Data (When U8351 Printer Unit is Installed)” (p. 133)
“7.1 Reading Measured Values (Using Cursors A and B)” (p. 146)
“Scrolling the waveforms with the jog dial and shuttle ring” (p. 152)
“7.5 Magnifying and Demagnifying Waveforms” (p. 156)

6 Completing the measurement

Refer to
“3.5 Starting and Stopping Measurement” (p. 86).

To observe the input signal

Pressing the AUTO key congures the timebase of the input waveform, vertical axis (voltage
axis) range, and zero-adjust settings automatically and then starts measurement.

Refer to “3.6 Measurement in Automatic Range Setting (Auto-Range Function)” (p. 89).

To load previously saved settings

Load the settings le using the le screen.

Saving the settings with respect to each measurement object and each application enables you

to perform measurement more convenient.

Refer to “5.3 Loading Data” (p. 120).

To automatically load previously saved settings at power-on

Previously saved measurement settings can be automatically loaded from a le when the
instrument is turned on. Simply insert an SD card containing an auto-settings le before turning

on the instrument.

Refer to “5.4 Automatically Loading Settings (Auto-setup Function)” (p. 123).

Make sure that the [HIOKI_MR8848] folder of the SD card contains the le.

To initialize the instrument (restoring the basic default settings)

From the system screen, select the [Init] sheet to reset the instrument to the factory default

settings.

After initialized, the instrument is set up to perform simple measurement easily.
If the operation of the instrument seems unusual or overly complex, initialize the instrument.

Refer to “19.2 Resetting the Instrument” (p. 436).

66

Inspecting the Instrument Before Measurement

HIOKI MR8848A961-00

3.2 Inspecting the Instrument Before Measurement

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.

(1) Inspecting products used with the instrument

When using probes and connection cords

Insulation of a probe or connection

cord to be used is damaged, or bare
metal is not exposed.

No metal exposed

Go to Step (2)

When using clamp sensors

Any clamp is not cracked or
damaged.

Go to Step (2)

No

(2) Inspecting the instrument and units

There is no visible damage to the
instrument or units.

No

When turning on the instrument

Metal exposed

There is an

abnormality.

There is an

abnormality.

Do not use them if damage is present, as you

could receive an electric shock.
Request repairs.

Do not use them if damage is present, as you

could receive an electric shock.
Request repairs.

If damage is evident, request repairs.

Measurement

The Hioki logo appears on the

screen.

Yes

The waveform screen appears.

Yes

Inspection terminates.

No

Nothing

appears, or

the display is

abnormal.

The power cord may be damaged, or the

instrument may be damaged. Request repairs.

The instrument may be damaged. Request
repairs.

67

Setting Measurement Conditions

HIOKI MR8848A961-00

3.3 Setting Measurement Conditions

This section describes how to set measurement conditions.

The settings window displayed on the Waveform display enables you to congure basic settings
conveniently while you are observing waveforms. The basic settings can also be congured on the

[Status] sheet of the status screen.

How to open the settings window

Settings
window

(p. 68)

Timebase
(Sampling

rate) (p. 70)

Press

the [DISP] key.

Measurement functions

Select a function depending on a type of measurement.

Procedure

To display the screen: Press the DISP key to open the waveform screen.

Move the cursor to the function box (the uppermost column of the settings window).

MEMORY (Default setting), RECORDER, X-Y RECORDER, FFT

Recording
length

(Number of
divisions)

(p. 73)

68

Used to measure instantaneous waveforms and transient phenomenon.

You can use the trigger and calculation functions.

Used to observe and record uctuations of phenomenon changing

slowly.

You can print data in real time.

Used to observe signals endlessly in X-Y curve format.

You can set the X-Y composite curves plotting setting to on/o󰀨 in the same manner as

the pen raising/lowering setting installed in typical X-Y pen recorders.
Refer to “4 X-Y Recorder” (p. 91).

Used to analyze frequencies.

You can conduct various types of the spectrum and octave analyses.

Refer to “13 START key” (p. 278).

Setting Measurement Conditions

HIOKI MR8848A961-00

Values obtained by the recorder function

While the recorder function is being used, the instrument obtains measured values at a previously
set sampling rate and lets both the maximum and minimum values be a sampling data value during
each of the sampling data periods. Thus, every sampling data value ranges in amplitude.

1 2 3 4 100

One sampling data

Maximum

value

Minimum
value

Data acquired at the specied sampling rate

1 div

If the input waveform uctuates widely due to noise even though usually it uctuates slightly, the
di󰀨erence between the maximum and minimum values obtained with the instrument at the sampling

rate that is relatively faster can be inordinately large.

Set the sampling rate to a slower setting to prevent this phenomenon from being observed.

Measurement

1 2 3 4 100

1 div

One sampling data

Maximum
value

Minimum
value

When the sampling rate is fast

69

Setting Measurement Conditions

HIOKI MR8848A961-00

Timebase and sampling rate

The timebase refers to a speed for sampling the input signal waveform. The timebase setting

denes a time length per division of the horizontal axis (time/div).
The sampling setting denes an interval at which the instrument samples waveforms.

While the memory function is being used, the sampling rate appears, enclosed
in parentheses, under the timebase box (as shown on the right). The displayed

sampling rate changes along with the timebase.

Procedure

To display the screen: Press the DISP key to open the waveform screen.

For the memory function

Move the cursor to the [Timebase] box.

1

5 (Default setting), 10, 20, 50, 100, 200, 500 µs/

Set the time per division on the horizontal axis

2

(time axis).

div
1, 2, 5, 10, 20, 50, 100, 200, 500 ms/div
1, 2, 5, 10, 30, 50 s/div, 1 min/div, 100 s/div
2, 5 min/div

To control the sampling rate using an external signal, select [External] and input the signal to the
external sampling terminal. To set back the setting to the internal sampling, select [Internal] and

set the time.
When the external sampling is used, the settable number of sampling per division can range from

10 S/div to 1000 S/div.

Refer to “External sampling (EXT.SMPL)” (p. 381).
If using the U8975, U8977, or U8978, the 5 µs/div range will not be available (the default setting
will be 10 µs/div).

For the recorder function

Move the cursor to the [Timebase] box.

1

Set the time per division on the horizontal axis

2

(time axis).

Move the cursor to the [Sampling] box.

3

Set the sampling rate.

4

10(Default setting), 20, 50, 100, 200, 500 ms/div
1, 2, 5, 10, 30, 50 s/div, 1 min/div, 100 s/div
2, 5, 10, 30 min/div, 1 h/div

1(Default setting), 10, 100 µs
1, 10, 100 ms

(Select a sampling rate from among the options
that are 1/100 of the timebase or less)

The selectable range varies depending on the timebase setting.

The higher the sampling rate is, the better you can observe minute changes.

70

Setting Measurement Conditions

HIOKI MR8848A961-00

How to select the timebase

Refer to the table below to set the timebase.

For example, to measure a waveform with a frequency of 100 kHz, a maximum display frequency
of between 200 kHz and 800 kHz should be selected according to the following table. When you
want to set the maximum display frequency to 400 kHz, the timebase should be set to 10 µs/div.

Maximum

Timebase Sampling rate

5 µs/div
10 µs/div
20 µs/div
50 µs/div

100 µs/div
200 µs/div
500 µs/div

1 ms/div
2 ms/div

5 ms/div
10 ms/div
20 ms/div
50 ms/div

100 ms/div
200 ms/div
500 ms/div

50 ns (20 MS/s)

100 ns (10 MS/s)

200 ns (5 MS/s)
500 ns (2 MS/s)

1 µs (1 MS/s)
2 µs (500 kS/s)
5 µs (200 kS/s)

10 µs (100 kS/s)

20 µs (50 kS/s)
50 µs (20 kS/s)

100 µs (10 kS/s)

200 µs (5 kS/s)
500 µs (2 kS/s)

1 ms (1 kS/s)
2 ms (500 S/s)
5 ms (200 S/s)

display

frequency

800 kHz
400 kHz
200 kHz

80 kHz
40 kHz
20 kHz

8 kHz
4 kHz

2 kHz
800 Hz
400 Hz
200 Hz

80 Hz
40 Hz
20 Hz

8 Hz

Timebase Sampling rate

1 s/div
2 s/div

5 s/div
10 s/div
30 s/div
50 s/div

1 min/div
100 s/div
2 min/div
5 min/div

10 ms (100 S/s)

20 ms (50 S/s)
50 ms (20 S/s)

100 ms (10 S/s)

300 ms (3.33 S/s)

500 ms (2 S/s)

600 ms (1.67 S/s)

1 s (1 S/s)

1.2 s (0.83 S/s)
3 s (0.33 S/s)

Maximum

display

frequency

4 Hz
2 Hz

0.8 Hz

0.4 Hz

0.13 Hz

0.08 Hz

0.04 Hz

0.067 Hz

0.033 Hz

0.013 Hz

Measurement

What is the maximum display frequency?

To plot sine waves that allow you to observe those peaks on the LCD,

the instrument needs to sample the waveforms at least 25 points

per cycle. The maximum display frequency varies depending on the

timebase setting.

If instrument plots non-existent waveforms (aliasing)

If a measured signal uctuates at a higher frequency compared to
the specied sampling speed, the instrument can probably plot non­existent waveforms uctuating at a lower frequency than that of

realistic signal when the signal frequency reaches a certain level. This

e󰀨ect is called aliasing.

Actual input signal

Sampling rate

Observer waveform
Aliasing occurs because the sampling rate is slower
than the cycle of the input signal.

3

2

1

One signal period

Sampling points

25

24

23

For the memory function, because the sampling rate can signicantly vary according to the timebase
setting, select the timebase setting carefully to avoid aliasing from occurring. Since the timebase setting
determines the maximum display frequency, perform measurement at as fast a timebase setting as

possible.

When recording signals repeatedly, the auto-range function (p. 89) is useful.

71

Setting Measurement Conditions

HIOKI MR8848A961-00

The sampling rate is automatically set to 1/100 of the selected timebase.

When the MR8990 Digital Voltmeter Unit is installed, the sampling rate of its channels is automatically set

to 1/50 of the selected timebase.

Example: When the 8966 is installed as Unit 1 (CH1 and CH2) and MR8990 as Unit 2 (CH3 and

CH4), then the timebase is set to 1 s/div.

Sampling rate of Unit 1 (8966): 10 ms

Sampling rate of Unit 2 (MR8990): 20 ms

To automatically set the timebase

Pressing the AUTO key selects a suitable timebase for an input signal and starts measurement.

This function can be used in the memory function only.

Refer to “3.6 Measurement in Automatic Range Setting (Auto-Range Function)” (p. 89).

• The timebase and sampling rate can be set independently. The sampling rate is selected

depending on the timebase setting.

• As mentioned below, when the former timebase settings are selected, the instrument displays

waveforms that are demagnied horizontally (in the time axis direction) at the latter scale size.
20 ms/div,

1/2; 10 ms/div, ×1/5

×

To perform measurement minimizing the e󰀨ect of noise

While measuring a waveform that usually uctuates only slightly, with a fast sampling rate set, a
di󰀨erence between the maximum and minimum values may become large if the amplitude of the
waveform changes sharply. To prevent this e󰀨ect, select a slower sampling rate or enable the
unit’s low-pass lter (p. 80).

Note common to

The data refresh rate is not allowed to exceed the maximum sampling rate of the unit.
During the period while data is being not updated, the same data is measured, with the result that

stair-like waveforms are plotted.

Even when a single signal is sampled simultaneously by two units, the data may di󰀨er with one
another due to di󰀨erences in the sampling rate, frequency bandwidth, and frequency response.

72

Data refresh rate for various units

HIOKI MR8848A961-00

Setting Measurement Conditions

Unit Max. timebase

8966, 8973 5 µs/div 50 ns (20 MS/s) –

8967 Depends on data refresh setting Depends on data refresh setting p. 193

8968 100 µs/div 1 µs (1 MS/s) –

8969, U8969, U8979 500 µs/div 5 µs (200 kS/s) –

8970 Depends on setting Depends on setting p. 195

8971 100 µs/div 1 µs (1 MS/s) p. 198

8972 Depends on response setting Depends on response setting p. 198

U8975, U8977, U8978 20 µs/div 200 ns (5 MS/s) –

MR8990 Depends on NPLC setting Depends on NPLC setting –

U8974 100 µs/div Depends on response setting p. 200

Recording length (number of divisions)

Set the recording length (number of divisions) of each data acquisition.

Procedure

To display the screen: Press the DISP key to open the Waveform screen.

Max. sampling rate or

data refresh rate

Reference

information

Measurement

For the memory function

Move the cursor to the [Shot] box.

1

Select the type.

2

User Shot Select the length from among the xed values.

Fixed Shot Freely specify a value in one division increments.

Set the recording length.

3

(Fixed Shot)

25, 50, 100, 200, 500, 1,000, 2,000, 5,000, 10,000, 20,000, 50,000, 100,000 div
200,000 div (in 2-, 4-, 8-, 16-ch mode), 500,000 div (in 2-, 4-, 8-ch mode)
1,000,000 div (in 2-, 4-ch mode), 2,000,000 div (in 2-ch mode)

(User Shot)

1 to 160,000 div (in 32-ch mode*
1 to 640,000 div (in 8-ch mode), 1 to 1,280,000 div (in 4-ch mode)
1 div to 2,560,000 div (in 2-ch mode)

*1. If using the U8975, U8977, or U8978

For the recorder function

1

), 1 to 320,000 div (in 16-ch mode)

1
2

Move the cursor to the [Shot] box.

Select the type.

User Shot Select the length from among the xed values.

Fixed Shot Freely specify a value in one division increments.

73

Setting Measurement Conditions

HIOKI MR8848A961-00

Set the recording length.

3

(Fixed Shot)

Cont

On-O󰀨

25,50,100,200,500,1,000,2,000,5,000,10,000,20,000,50,000 div,100,000 div*

*1. If not using the U8975, U8977, or U8978

(User Shot)

1 div to 80,000 div
1 div to 160,000 div*

*1. If not using the U8975, U8977, or U8978

When [On] is selected, the instrument performs measurement while continuously overwriting
the data in the memory. You can save and print the data obtained during the period from the

measurement was stopped until the recording reached its maximum record length.

1

1

74

Setting Measurement Conditions

HIOKI MR8848A961-00

Recording length and the number of samples

Every division of the recording length includes 100 samples. The total number of samples in a

specied recording length is: Set recording length (divisions)
However, when the MR8990 Digital Voltmeter Unit is installed, the number of samples is as follows:

• When only the MR8990 is installed

Number of samples in a division: 50 samples

Total number of samples in the recording length: Set recording length (divisions)

50 samples + 1

×

• When both the MR8990 and other units are installed

Channels for the MR8990

Number of samples in a division: 50 samples

Total number of samples in the recording length: Set recording length (divisions)

50 samples + 1

×

Channels for other units

Number of samples in a division: 100 samples

Total number of samples in the recording length: Set recording length (divisions)

100 samples + 2

×

100 samples + 1.

×

Measurement

Each recording length division includes 100 samples, each of which consists of two values: the
maximum and minimum values.

Using the recorder function causes the MR8990 to acquire data with a resolution of 16 bits.

When recording length is set to [Cont.]

• The instrument saves data that is obtained during the period that lasts until the measurement

terminates and has the following maximum recording lengths.

• 160,000 div (if using the U8975, U8977, or U8978: 80,000 div)

• For the range settings of from 10 ms/div to 200 ms/div, the instrument does not perform the real-

time print even when the printer setting (real-time print) is set to on. Perform printing manually

after measurement terminates (p. 137)

• When the auto-saving is set to on, the instrument does not save any data during the

measurement. When the measurement terminates, the data presently written in the internal

memory is saved.

When the recording length is changed during measurement

Measured data already acquired in the memory is discarded, and measurement is started using the

newly set recording length.

75

Setting Measurement Conditions

HIOKI MR8848A961-00

Screen layout

You can lay out waveform displays of input signals on the waveform screen.

This setting also applies to the printing setting.

Selecting X-Y Single mode or X-Y Quad mode plots X-Y composite curves.

This function can be used in the memory and X-Y recorder functions.

Refer to “7.4 Plotting X-Y Composite Curves” (p. 154).

Procedure

To display the screen: Press the STATUS key several times to display the [Status] sheet on the status screen.

For the memory function

Move the cursor to the [Format] box.

Single Displays and records waveforms in a graph. (Default setting)

Dual Displays and records waveforms in two graphs.

Quad Displays and records waveforms in four graphs.

Oct Displays and records waveforms in eight graphs.

Hex Displays and records waveforms in sixteen graphs.

X-Y Single Plots and records curves that illustrate correlations between them assigning multiple

input signals to the X and Y axes in a graph.

X-Y Quad Plots and records curves that illustrate correlations between them assigning multiple

input signals to the X and Y axes in four graphs.

For the recorder function

Move the cursor to the [Format] box.

Single Displays and records waveforms in a graph. (Default setting)

Dual Displays and records waveforms in two graphs.

Quad Displays and records waveforms in four graphs.

Oct Displays and records waveforms in eight graphs.

Hex Displays and records waveforms in sixteen graphs.

Analog channel assignment

In Dual, Quad, Oct, and Hex mode, you can freely assign analog channels to the di󰀨erent graphs.

Procedure

To display the screen: Press the CHAN key several times to display the [Unit List] sheet on the channel screen.

Move the cursor to the [Graph] box.

1

Example screen after assigning channels

Select the display screen with respect to

2

each channel.

The graphs are numbered beginning from

the top like Gr1, Gr2, Gr3.

76

Gr1

Gr2

Gr3

Gr4

Conguring Input Channels Settings

HIOKI MR8848A961-00

3.4 Conguring Input Channels Settings

Conguring analog and logic channels settings.

To open the channel settings window

Refer to “Setting the variable function while the waveforms obtained

through all of the channels are being displayed” (p. 186).

The sheet changes every time the

CH.SET key is pressed.

[Analog]

[Variable]

[Logic]

[Wave Calc](when [Wave
Calculation] is set to on)

or

[Generator](when a waveform

generator unit is
installed)

No display

If the channel setting screen is hard to be observed due to

waveforms overlay, reduce the waveform display width to separate

the waveform display screen from trigger settings screen.
Refer to “Switching the waveform display width” (p. 162).

To reduce the number of displayed waveforms

Set the waveform display color setting on the Channel setting window to o󰀨.

Refer to “1. Waveform display color” (p. 80).

Measurement

To apply a channel setting to another channel

Refer to “8.9 Copying Settings to Other Channels (Copy Function)” (p. 189).

77

Conguring Input Channels Settings

HIOKI MR8848A961-00

Channel setting procedure

The procedure below shows how to congure the analog channels (CH1 through CH16) settings.

1 Conguring the settings of input and screen display

Refer to the following
pages:

Conguring the input coupling setting

Selecting an appropriate range for the input signal

Scaling the input value (As needed)

Conguring the lter setting (If performed in noisy environment)

Finely adjust the waveform amplitude (As needed)

Magnify/demagnify the waveform vertically (in the voltage-axis
direction) (As needed)

(p. 81)

(p. 80)

(p. 177)

(p. 83)

(p. 81)

(p. 81)

2 Conguring the trigger settings (as needed)

Refer to
(p. 217).

3

Conguring the settings of waveform display colors and positions

Refer to the
following pages:

Setting the waveform display color

(p. 80)

Setting the display position and magnication ratio (As needed)

(p. 184)

4 Conguring the graph display settings

Refer to the following
pages:

In Single, Dual, Quad, Oct, and Hex mode

In X-Y Single and X-Y Quad mode

• Setting the input coupling set to GND disables the range settings because the waveforms seem

to have no amplitude.

• Filter attenuation may inuence correct range settings.

• When choosing trigger settings, set the vertical axis (voltage axis) range rst. When you change

the range after specifying the trigger, the trigger setting is changed.

• When using the variable function, set the vertical axis (voltage axis) range rst. When you change
the range setting after applying the variable function, observation of waveforms with su󰀩cient

precision may not be possible.

(p. 76)

(p. 155)

78

Conguring Input Channels Settings

HIOKI MR8848A961-00

• When using the variable and scaling functions together, enable the scaling function rst. When
you enable the scaling function after enabling the variable function, an unintended display may be

displayed.

This section describes the setting procedure for logic channels (standard logic terminals: LA

through LD, expansion logic terminals: L1A through L8D).

1 Conguring the display settings

Refer to

Conguring the logic recording width settings

(p. 84).

2 Conguring the settings of waveform display colors and positions

Refer to the following
pages:

Setting the waveform display positions

(p. 84)

Measurement

Setting the waveform display color

• The waveform display positions can be specied in one percent point increments.

• No logic waveforms are displayed in X-Y Single and X-Y Quad modes

• Up to three logic units can be installed. The instrument ignores the fourth logic unit and later units

that are installed in the instrument.

(p. 84)

79

Conguring Input Channels Settings

HIOKI MR8848A961-00

Analog channel settings

For information about specic settings for each unit, refer to “8.10 Setting Details of Units” (p. 190).

Procedure

To display the screen: Press the DISP key to display the waveform screen, and then press the CH.SET key to open
the channel settings window ([Analog] sheet).

Move the cursor to the channel for which

1

you want to change the settings.

Select settings by pressing the F key.

2

1. 2. 3. 4. 5. 6. 7.

To apply the settings to another channel

Refer to “8.9 Copying Settings to Other Channels (Copy Function)” (p. 189).

1. Waveform
display color

2. Vertical axis
(voltage axis)
range

Sets the color of the waveform of the selected channel. You can also select

the same color as other lines.

O󰀨 Displays no waveform. When [Save Channel] of the auto-saving

setting is set to [Disp Ch], the instrument does not save any data of
this channel.
Refer to “Select the channels to be saved.” (p. 104).

On Displays the waveform. To select the display color, press [↑] and [↓]

in the F keys.

All On-O󰀨 You can switch the waveforms display between on and o󰀨 for entire

channels.

Sets the vertical axis (voltage axis) range with respect to each channel.
You can set the vertical axis range in terms of voltages per division.

When the variable auto-correction is set to [O󰀨
is set to [On], the size of the waveform displayed on the screen is xed

regardless of the vertical axis (voltage axis) ranges.

Full-scale
value

Full-scale value = {Vertical axis (voltage axis) range}
Example: When the vertical axis (voltage axis) range is set at
1 V/div, the full-scale value is calculated as

1 V/div × 20 = 20 V.

As the full-scale value is 20 V, the measurable range is

20 V.

±

] and the variable function

20 div

×

If a waveform amplitude falls outside of the range

80

Changes the vertical axis (voltage axis) range to a lower sensitivity setting.

Conguring Input Channels Settings

HIOKI MR8848A961-00

3. Input coupling

4. Vertical axis
(voltage axis)

magnication

ratio

You can set the input signal coupling method. Typically, select the DC coupling.

DC (V, –) Measures the input signals including both DC components and AC

components. (Default setting)

AC (

GND (

V

, )

)

Measures the input signal, including AC components only. DC

components are rejected.

Measures the input signals short-circuiting the input signal to the

ground. This enables you to check the zero position of the signal.

You can set the magnication ratio of waveforms in the vertical axis (voltage
axis) direction for displaying and printing waveforms respect to each channel.
Magnifying waveforms are performed based on the zero position. Magnifying
waveforms does not inuence the measurement resolution.

Refer to “Magnifying/Demagnifying the waveforms vertically

(in the voltage axis direction)” (p. 159).

To display waveforms magnied in user-dened magnication ratios, enables

the variable function.

When signs of displayed waveforms are reversed, you can ip the

waveforms vertically.

Refer to “8.6 Setting the Waveform Position (Variable Function)” (p. 184).
Refer to “8.8 Inverting the Waveform (Invert Function)” (p. 188).

Measurement

5. Vernier

6. Zero position

You can nely adjust input voltage amplitudes freely on the waveform screen
(This ne adjustment changes waveforms shape only seemingly).
When recording physical values such as noise, temperature, and acceleration
with sensors, you can adjust those amplitudes, facilitating calibration.

Refer to “8.7 Fine-Adjusting Input Values (Vernier Function)” (p. 187).

You can set the zero-volt level display position. If the zero-volt input level is
displaced, perform the zero-adjust.

Refer to “2.7 Adjusting the Zero Position (Zero-Adjustment)” (p. 63).
Refer to “2.8 Performing Calibration (When MR8990 is Installed)” (p. 64).

To move the zero positions of entire channels at a time, press [Preset].

Ascending order

(3%→96%)

Descending order

(96%→3%)

All Ch 0% Moves the zero position of entire channels to the 0% level of the

All Ch 50% Moves the zero position of entire channels to the 50% level of

Moves the zero position of CH1 to the 10% level of the vertical
axis and those of the following channels, through CH16, to each

position that increases in 5 percentage points increments.

Moves the zero position of CH1 to the 90% level of the vertical
axis and those of the following channels, through CH16, to each

position that decreases in 5 percentage points increments.

vertical axis.

the vertical axis.

If the zero position of the waveform obtained with the 8969 or U8969 Strain
Unit is displaced, perform the auto-balance.

Refer to “Setting the 8969 and U8969 Strain Units” (p. 194).

• The zero position setting merely change waveform positions, not applying any o󰀨sets to inputs

signals.

• The vertical axis (voltage axis) magnication/demagnication of waveforms is performed based

on the zero position.

• The zero position adjustment and the vertical axis (voltage axis) magnication/demagnication

merely change displayable voltage ranges on the waveform screen. No actual measurement
ranges are not changed.

81

Conguring Input Channels Settings

HIOKI MR8848A961-00

The zero positions are moved as shown in the illustration below.
Example: 8966 Analog Unit

Zoom factor

A/D data

2047

1

×

2000 LSB

Displayed area
(Zero position: 0%)

100 %

50 %

Displayed area
(Zero position: 50%)

Displayed area
(Zero position: 100%)

0 0 V

A/D data

−2047

0 %

Resolution of each unit in screen display range (LSB)

Unit

8966
(Analog)
8971
(Current)
8972
(DC/RMS)

8967
(Temperature)*

8968

(High

resolution)
U8974

(High voltage)
U8975, U8978
(4CH analog)

U8977

(3CH current)

1/10

×

20000

(4000)

200000 100000 40000 20000 10000 4000 2000 1000 400 200

320000
(64000)

1/5

×

10000
(4000)

160000
(64000)

1/2

×

4000 2000 1000 400 200 100 40 20

64000 32000 16000 6400 3200 1600 640 320

Magnication ratio

1

×

2

×

5

×

10

×

20

×

50×100

×

8969, U8969

(Strain)
U8979
(Charge)

8970
(Power
frequency)

8970 (Count) 400000 200000 80000 40000 20000 8000 4000 2000 800 400

8970
(

Excluding

power
frequency and
count

)

MR8990
(DVM)

The magnication ratios enclosed in the brackets represent ranges of valid data.
*: For the 8967 Temp Unit, the valid range varies depending on thermocouples. For information about the

minimum resolution, see the specications of the 8967 Temp Unit.

82

250000
(64000)

20000 10000 4000 2000 1000 400 200 100 40 20

100000 50000 20000 10000 5000 2000 1000 500 200 100

10000000

(1200000)

125000
(64000)

5000000

(1200000)

50000 25000 12500 5000 2500 1250 500 250

2000000

(1200000)

1000000

500000 200000 100000 50000 20000 10000

Conguring Input Channels Settings

HIOKI MR8848A961-00

7. Low-pass lter

You can set the low-pass lter installed in the unit. Enabling this function

can eliminate unwanted high-frequency components.

Settable lter types varies depending on units. Select a suitable setting

according to an input signal characteristics.

Measurement

83

Conguring Input Channels Settings

HIOKI MR8848A961-00

Logic channel settings

The [Logic] sheet appears in Single, Dual, Quad, Oct, and Hex mode.

Procedure

To display the screen: Press the DISP key to display the waveform screen, and then press the CH.SET key to open
the channel settings window ([Logic] sheet).

Move the cursor to the channel for which

1

you want to change the settings.

Select settings by pressing the F key.

2

2. 3.

1.

To apply the settings to another channel

Refer to “8.9 Copying Settings to Other Channels (Copy Function)” (p. 189).

1. Logic width

2. Waveform
display position

3. Waveform
display color

You can change the display width of the logic waveform.
Making waveforms narrower can enhance the readability of the display
containing a large number of waveforms.

Wide Displays waveforms at expanded width.

Normal Displays waveform at the normal width.

Narrow Displays waveform at reduced width. (Default setting)

You can set the logic waveforms positions.
You can freely move the positions of the logic waveforms within the range
of the display.

Sets the color of the waveform of the selected channel. You can also select
the same color as other lines.

For logic unit, either each unit or each channel can have a di󰀨erent color

setting.

O󰀨 Displays no waveform. When [Save Channel] of the auto-

saving setting is set to [Disp Ch], the instrument does not save
any data of this channel.
Refer to “Select the channels to be saved.” (p. 104).

On Displays the waveform. Press the F key to set the display colors.

Setting the standard logic (LA, LB, LC, and LD) display setting to [On] disables the 8970 Freq Units
installed in Unit 1 and Unit 2 positions. Furthermore, it deteriorates the resolutions of the 8967
Temp Unit, 8968 High Resolution Unit, 8969 Strain Unit, U8969 Strain Unit, U8974 High Voltage
Unit, and U8979 Charge Unit from 16 bits to 12 bits. Installing the MR8990 Digital Voltmeter Unit,
U8793 Arbitrary Waveform Generator Unit, MR8790 Waveform Generator Unit, or MR8791 Pulse

Generator Unit installed in Unit 1 and Unit 2 positions disables the standard logic terminals.

84

Probe On-O󰀨 Switches the waveform display between on and o󰀨 at a time for

those obtained with a single probe.

All On-O󰀨 Switches the entire logic waveform display between on and o󰀨

at a time.
This setting is selectable when the cursor is placed on any item

of the waveform display position box.

Conguring Input Channels Settings

HIOKI MR8848A961-00

Display sheet

The input channel settings can be set with respect to each display sheet. Up to four sheets are

available.

You can assign waveforms to be displayed to each display sheets and switch a display sheet to

another.

Switching sheets (1 through 4)

Measurement

• You can set the following display-related settings only with respect to each display sheet.

Analog waveform: Display on/o󰀨, waveform color, magnication ratio, zero position, graph,

variable (on/o󰀨, upper and lower limits)
Logic waveform: Display on/o󰀨, waveform color, display position, logic width
X-Y waveform: Display on/o󰀨, display color, X ch, Y ch, waveform calculation (X ch, Y ch)

Common setting: Display format

• The measurement-related settings other than above are common to all displayed sheets.

• When a range is changed, the ranges of entire display sheets are changed.

• Saving settings les operation saves the settings of all displayed sheets.

• Saving waveform les operation saves the waveforms in the setting of the sheet displayed at

the time of saving. When you try to load a waveform le, only the sheet displayed at the time of

saving can be loaded because other sheets were not saved.

You can congure the waveform calculation settings using the channel setting window.
Refer to “3.4 Conguring Input Channels Settings” (p. 77).

85

Starting and Stopping Measurement

HIOKI MR8848A961-00

3.5 Starting and Stopping Measurement

Procedure

To display the screen: Press the DISP key to open the waveform screen.

To start measurement

Press the START key to start measurement.

• When measurement is started, waveform data displayed on the screen is cleared.

• Applying a signal to the external control terminal can start measurement.

Refer to “17 Controlling the Instrument Externally” (p. 375).

To prevent starting measurement unintentionally

To prevent the instrument from starting measurement unintentionally due to operation mistakes,

you can change the START key operation method.

Refer to START key acceptance conditions (p. 341).

To automatically save data during measurement

Refer to “Automatically saving waveforms” (p. 102).

To print waveforms

Refer to “6 Printing Data (When U8351 Printer Unit is Installed)” (p. 133).

To stop the measurement in progress

Press the STOP key once to stop the measurement in progress after the specied recording length
expires.

Press the STOP key once again to stop the measurement in progress immediately.

You can change key acceptance conditions for the START and STOP keys.

Refer to “15 Setting the System Environment” (p. 341).

Pressing the STOP key may display the following GUI on screen.

Stops the measurement in progress immediately.
(the same behavior as that when pressing the STOP key twice)

Cancels the stopping action and continue the measurement in progress.

When no keys are operated during this status, the measurement is terminated after the specied
recording length expires, and the display returns to the previous screen.

86

Starting and Stopping Measurement

HIOKI MR8848A961-00

Measurement and internal operations

Two options of the measurement methods available: the normal measurement (starts measuring

and recording waveforms at once) and trigger measurement (starts recording waveforms when

trigger conditions are satised). In this manual, “Start of measurement” indicates the time when you

press the START key, and “start of acquisition” indicates a start time of waveform acquisition on the

waveform screen.

To trigger the instrument once or repeatedly

Select the trigger mode. (p. 219)

To observe data acquired preceding the trigger point

Set a pre-trigger. (p. 232)

Typical
measurement

Triggered
measurement

Trigger mode:

[Single]

With the pre-trigger

not enabled

Without trigger setting

Start
measurement

START key

Recording starts

The recording terminates after the recording length expires.

Recording End of measurement

Recording stops

[Now Storing] Storing Finished

[ ]: Status bar display

Triggering the instrument once

Start
measurement

START key

[Trigger wait]

A trigger event starts recording, and the recording terminates after the recording length

of the data is acquired.

T

Recording End of measurement

Recording stopsRecording starts

[Now Storing] Storing Finished

Measurement

Trigger mode:

[Repeat]

With the pre-trigger

not enabled

Triggering the instrument repeatedly

Start
measurement

START key

[Trigger wait]

A trigger event starts recording, and the recording terminates after the recording length
of the data is acquired, setting the instrument to wait for another trigger.

T T

Recording End of measurement

STOP key

Recording stopsRecording starts

[Now Storing] [Trigger wait]

Recording starts

87

Starting and Stopping Measurement

HIOKI MR8848A961-00

Triggering the instrument repeatedly and recording phenomena before

each trigger event

Trigger mode:

[Repeat]

With the pre-trigger

enabled

Start

The specied pre-trigger wait period is recorded before each trigger event.

measurement

START key

Recording starts

[Pre-Trigger wait]

After starting measurement and internally acquiring data for the

specied pre-trigger period, the [Trigger Wait] state is activated.

T

[Trigger wait]

Recording End of measurement

Recording stops

[Now Storing]

Storing Finished

Operation is
repeated from
pre-triggering
stage.

Wave for m during

specied pre-trigger

period

T

Post-trigger
waveform

The data before a trigger event (for the pre-trigger period) is acquired.

When the trigger mode is set to [Repeat] or [Auto] (the memory function

only), the number of trigger events is displayed at the top of the screen. (Storage

counter)

Refer to “Display” (p. 30).

88

Measurement in Automatic Range Setting (Auto-Range Function)

HIOKI MR8848A961-00

3.6 Measurement in Automatic Range Setting (Auto-Range Function)

This function is enabled only for measurement with the analog units with the memory function enabled.

When you press the AUTO key after inputting signals to an analog unit and select [Auto Range],

the horizontal axis range (timebase), vertical axis (voltage axis) range, and zero position are
selected automatically, and then measurement is started.

The timebase is set to the lowest numbered channel of the channels with those waveform display

setting set to on. In addition, it is set automatically so that waveforms with a length of from one

cycle to 2.5 cycles in 25 divisions are recorded.

Setting the auto-range function set to on changes the following items.

Unit-related conditions (For all channels)

Vertical axis (voltage axis) range

Zero position

Vertical axis (voltage axis) magnication ratio×1
Low-pass lter O󰀨

Input coupling DC

Automatically-set value

Measurement

Trigger conditions (For a single channel only)

Trigger Mode Auto

Logical operation between trigger sources OR

Pre-trigger 20%

Set to on is only the lowest numbered channel of channels

Internal trigger

Trigger type

Condition of [Status] sheet on the status screen

Timebase Automatically-set value (time axis magnication ratio:

with those waveform display setting. (If the di󰀨erence
between maximum and minimum value is eight divisions or
less, the second lowest numbered channel is turned on.)

Level trigger: Slope, Rising

Trigger level: Automatically-set value

Filter: O󰀨

1)

×

• When measurement is started in the auto-range setting, the trigger output signal is output from
the external control terminal block’s TRIG OUT terminal. Keep this in mind when performing auto­range measurement while using the trigger output terminal.

• The auto-range function automatically selects settings for an input signal when the function is

enabled. After supplying an input signal (waveform), start auto-range measurement.

• If the input signal of the lowest numbered channel with the waveform display setting set to on

have extremely low amplitude, the timebase is set according to the input signal of the next lowest

numbered channel.

• If the range cannot be set for any channels with waveform display setting set to on, a warning

message is displayed, with the result that the measurement in progress is interrupted.

• The auto-range measurement disables the auto-saving and auto-printing functions.

• For a low-frequency signal of less than 10 Hz, the optimal ranges cannot be selected
automatically. Set the ranges manually.

• Using the following units disables the auto-range function:

8967 Temp Unit, 8969 Strain Unit, U8969 Strain Unit, 8970 Freq Unit, MR8990 Digital Voltmeter

Unit

89

Measurement in Automatic Range Setting (Auto-Range Function)

HIOKI MR8848A961-00

90

4

HIOKI MR8848A961-00

X-Y Recorder

• You can plot X-Y composite curves each of which presents the relationship between an input

signal and another in real time.

• Since the instrument writes the data of plotted curves in the memory, it can save the data as les

as well as print the curves.

• You can set the waveforms plotting setting to on and o󰀨 in the same manner as the pen raising

and lowering setting installed in typical X-Y pen recorders.

• You can observe up to eight X-Y composite curves simultaneously.

• Since the instrument writes X-Y composite curves in the memory, it can redraw the X-Y composite

curves in other display settings after measurement.

Example of X-Y recorder waveform screen (in X-Y4 mode)

The bar indicates
the amount of
occupied memory.

X-Y Recorder

[OVER] appears

when the memory

is lled with the

waveforms to
capacity.

91

Measurement Procedure

HIOKI MR8848A961-00

4.1 Measurement Procedure

1 Inspecting the instrument before measurement

Refer to
“3.2 Inspecting the Instrument Before Measurement” (p. 67).

2 Conguring the basic measurement settings

Setting the measurement function to the X-Y
recorder

Refer to the following pages:

“Measurement functions” (p. 93)

Setting the sampling rate

Setting the X-Y composite curve display mode

Specify whether to perform X-Y composite curve
interpolation

Specify whether to clear previous X-Y composite
curve data

3 Conguring input channel settings

Congure the analog channel settings

Logic channels cannot be used.

Advanced settings

Refer to the following pages:
“8.6 Setting the Waveform Position (Variable Function)” (p. 184)
“8.7 Fine-Adjusting Input Values (Vernier Function)” (p. 187)
“8.1 Adding Comments” (p. 166)
“8.5 Converting Input Values (Scaling Function)” (p. 177)

“Sampling” (p. 93)

“Format” (p. 93)

“Dots-Line (interpolation)” (p. 93)

“Disp Clear” (p. 93)

Refer to

“Analog channel settings” (p. 80)

4 Starting measurement

5 Completing the measurement

92

Refer to the following pages:
“4.3 Starting and Stopping Measurement” (p. 94)
“7.1 Reading Measured Values (Using Cursors A and B)”
(p. 146)

Refer to the following pages:
“4.3 Starting and Stopping Measurement” (p. 94)
“4 Redraw X-Y composite curves” (p. 94)
“Saving data selectively (SAVE key)” (p. 113)
“6.3 Manually Printing Data by Pressing the PRINT Key (Selection Print)” (p. 137)

The X-Y recorder function does not
support the following operations:

• Trigger setting

• Auto-saving

• Auto-printing

Setting Measurement Conditions

HIOKI MR8848A961-00

4.2 Setting Measurement Conditions

To set the measurement conditions, press the STATUS key to display the status screen, and then

select the [Status] sheet. (The measurement functions and sampling rates can also be set on the

waveform screen.)

Setting items

Measurement
functions

Sampling Set the sampling rate.

Format Select the graph format for the waveform screen display or printout of the input

Dots-Line
(interpolation)

Disp Clear When previously plotted X-Y composite curves remain at the start of

Set the measurement function to [X-Y REC].

1 MS/s, 10 MS/s, 100 MS/s (Default setting)

The setting [1 ms] can be set only when the [Dots-Line] is set to [Dots].

signal. Up to eight phenomena can be observed simultaneously.

X-Y Single Displays and records the waveforms of graphs 1 through 8 in Single mode.

(Default setting)

X-Y Quad Displays and records the waveforms of graphs 1 through 8 in Quad mode.

Select whether to display and print the input waveform (sampling data) as dots

(sampling points) or perform the linear interpolation. Dot display allows faster

sampling.

Dots Displays and prints sampling data as dots.

Line Displays and prints linearly interpolated sampling data. (Default setting)

measurement, you can choose between leaving them and clearing them. When

you choose to leave them, the new waveforms are displayed as an overlay.

X-Y Recorder

O󰀨 Overlays new waveforms with the existing waveforms.

On Clears the previously plotted waveforms. (Default setting)

Setting measurement conditions terminates.

Next, congure the analog channel settings.

For details, refer to “Analog channel settings” (p. 80).

To choose channels used to plot X-Y composite curves

Refer to “7.4 Plotting X-Y Composite Curves” (p. 154).

93

Starting and Stopping Measurement

HIOKI MR8848A961-00

4.3 Starting and Stopping Measurement

Press the DISP key to go to the waveform screen.

Start measurement.

1

Press the START key to start measurement.

Set the X-Y composite curves plotting to on and o󰀨 (make the pen setting to up and

2

down).

You can choose this setting both before and during measurement. Setting the pen setting to Down
enables the X-Y composite curve plotting function. Setting the pen setting to Up disables the X-Y
composite curve plotting function. This setting applies to all channels.
Move the cursor to the [Pen] box to change the setting.

Up Disable the X-Y composite curve

plotting function.

Down Enable X-Y composite curves to be

plotted.

Setting the pens in the Down position

The pens are shown in colors and curves are
plotted.

Stop the measurement in progress.

3

Press the STOP key to stop the measurement in progress.

Redraw X-Y composite curves

4

The instrument plots the X-Y composite curves that start from any specied sampling point and consists

of 4,000,000 (if using the U8975, U8977, or U8978: 2,000,000) samples of the data recorded before the
measurement terminated, playing back the X-Y composite curve plotting in the same manner as video
recorders.
This setting applies to all channels. You can specify the playback speed. (You can also change it during
playback.)

X-Y composite curves are only played back on the screen, not a󰀨ecting the printout data. To print the

same X-Y composite curves as shown on the screen, use the screenshot function (p. 143).

Pressing the TRIG.SET key or the Manual
Trigger key can switch the [Pen] setting
between up and down as well.

Setting the pens in the Up position

The pens are shown in white, and no X-Y
composite curves are plotted.

Inputting signals to the external control terminal can start and stop measurement and switch the

[Pen] setting between up and down as well. (p. 378)

94

Move the cursor to the [Player] box.

Disp Clear Clears only the displayed X-Y composite curves.

(The instrument does not discard the waveform data written in the memory.)

Redraw Redraws the X-Y composite curves. The X-Y composite curve display conditions can

also be changed for plotting the curves again.

First Moves the pens to the start points of the X-Y composite curves.

Last Moves the pens to the end points of the X-Y composite curves.

Play/Stop Starts and stops the X-Y composite curve playback.

Move the cursor to the [Speed] box.

In the [Normal] setting, plays back the X-Y composite curves at the same speed as at which they recorded.

Very Fast

,

Fast, Normal (Default setting), Slow, Very Slow

Observing X-Y Composite Curves

HIOKI MR8848A961-00

To redraw the X-Y composite curves in di󰀨erent X-Y composite curve display

settings

• Even after the X-Y composite curve display is cleared, the waveform data is still retained in

the memory. This makes it possible to redraw the X-Y composite curves in di󰀨erent settings,

which include the display format, display color, channels used for plotting the curves, channel
magnication ratio, and channel o󰀨set, from those previously set. (Select [Redraw])

Executing [Redraw] update the screen and printout data.

Until [Redraw] is not executed, the screen and print data are not updated, even if the settings are

changed.

• The X-Y composite curves can also be redrawn by operating the jog dial and shuttle ring.

Jog dial Plots the X-Y composite curves and plays back the plotting of the curves inversely

in one sample increments.

Shuttle ring Plots the X-Y composite curves and plays back the plotting of the curves inversely

at speed proportional to the rotation angle.

• To play back the plotting of the X-Y composite curves inversely, plot curves in the direction of

earlier data. Erasing the X-Y composite curves is not possible.

• If the measured data exceeds 4,000,000 (if using the U8975, U8977, or U8978: 2,000,000)

samples, it is only possible to redraw up to 4,000,000 (if using the U8975, U8977, or U8978:

2,000,000) samples in the past, counting backward from the point when measurement terminated.

The instrument discards waveform data obtained earlier.

• Redrawing the X-Y composite curves with the jog dial and shuttle ring a󰀨ects the X-Y composite

curves displayed on the screen only and does not a󰀨ect the printout data. To print the same X-Y

composite curves as shown on the screen, use the screenshot function (p. 143).

X-Y Recorder

4.4 Observing X-Y Composite Curves

Up to 4,000,000 samples of waveform data are written in the memory, and you can observe those

measured values using Cursors A and B. (p. 146)

The bar at the top of the screen indicates the amount of the occupied memory.

When the number of samples reaches 4 million, the sign [OVER] appears next to the screen bar at

the top.

Saving and printing waveforms

Saving X-Y

composite

curves

Printing X-Y

composite

curves

Pressing the SAVE key or executing the saving command using the le screen

saves the waveform data written in the memory as a le.

Refer to “Saving data selectively (SAVE key)” (p. 113).

Pressing the PRINT key prints out the X-Y composite curves.

Refer to “6.3 Manually Printing Data by Pressing the PRINT Key (Selection

Print)” (p. 137).

The data saved in this way as a le can be loaded into the instrument, however, it cannot be loaded

into PCs.

95

Observing X-Y Composite Curves

HIOKI MR8848A961-00

96

Saving/Loading Data

HIOKI MR8848A961-00

5

and Managing Files

This chapter explains how to save and load data and manage les.

Before saving data, congure the save settings on the [File Save] sheet of the system screen.
The File screen allows you to load data and manage les.

To display the [File Save] sheet

The sheet changes every time

the SYSTEM key is pressed.

[Interface]

[Init]

[Environment]

[File Save]

[Printer]

Operations available on the [File Save] sheet

The following settings are available on the [File Save] sheet. (Refer to p. 101.)

Auto-saving settings

Setting the method of the auto-saving of waveform data.

SAVE key settings

Setting the method of saving the data when pressing the SAVE key.

Saving/Loading Data and Managing Files

97

HIOKI MR8848A961-00

To display the le screen

Indicates the order

in which the les
are sorted.

Ascending order

:



Descending order

:



Press the [FILE] key.

The selected le is
indicated by the ashing cursor.

Press Left/Right CURSOR key

to move between folder levels.

Press the Up/down CURSOR

keys to select les.

Read-only les and folders
are shown in blue.
These les and folders cannot
be renamed or deleted.

Storage device
information

Shows information about the selected storage device.
File Count: Displays the number of les saved in the selected folder.
Dir Count: Displays the number of folders in the selected folder.
Count: Displays the number of les and folders you can create

at the selected folder level.

When the storage device is not displayed, and you cannot

perform any operations, choose a setting option other than

[Mass storage SSD] or [Mass storage SD] in the [USB Set]

box.

To change storage devices

1

Refer to “2.3 Preparing Storage Devices” (p. 56).

Select [Change Media] and select a storage device type.

2

The les saved on the selected storage device appears on the le list.

Operations available from the le screen

Formatting storage devices (p. 58)

Loading data (p. 120)

Saving and loading auto-setting les (p. 123)

Displays the information of

the selected le.

Managing les (p. 101)

• Saving data (p. 125)

• Creating a new folder (p. 127)

• Copying a le (p. 131)

• Sorting les (p. 129)

• Deleting a le (p. 128)

• Renaming a le (p. 130)

• Printing a le table (p. 132)

98

Data That Can be Saved and Loaded

HIOKI MR8848A961-00

5.1 Data That Can be Saved and Loaded

File type

Settings data*

1

Waveform data*

The entire length
of the waveforms
or the portion of
waveforms within
the range between

Cursors A and B
(acquired in the
instrument)

2

File

format

Binary SET

Binary

Text

Icon File extension and description

MEM Memory function waveform data

REC

XYC

FFT FFT function data

CSV Text data

Settings data (measurement
conditions)

Recorder function waveform

data

X-Y recorder function X-Y curve

data

Save

Auto

Manual

‒

 

  

  

‒

 

  

 



Load

‒

: Yes, ‒: No

PC-

readable

‒

4

‒ *

4

‒ *

‒

‒



Waveform

management

3

data*

(memory division /
division save)

Captured screen

images (Display/

Waveform

screens)

Calc Result

Comments for

printing

Waveform

evaluation setting

data

Waveform

evaluation area

Arbitrary

waveform data

IDX Index data for division save

(Index le)

SEQ

5

BMP*

Text CSV Text data

Text TXT Text data ‒ ‒

Binary ARE

BMP BMP

Binary WFG

BMP Image data ‒

Index data for memory division

(automatically created during
batch saving)

Settings data

(Measurement conditions +
waveform evaluation areas)

Waveform evaluation area

image data

User-dened waveform data
(For U8793)

  

  

 

‒

‒

‒

‒



‒

6

*



 

  

 

‒

‒

Saving/Loading Data and Managing Files







‒

‒

Arbitrary

waveform data

Pulse pattern

data

Generation

program data

License key

Text TFG

Binary PLS

Program FGP

Text key Data for adding functions ‒ ‒

User-dened waveform data
(For U8793)

Pulse pattern data
(For MR8791)

Generation program data

(For U8793)

‒ ‒

‒

‒

 

 

 



‒

‒

‒

99

Data That Can be Saved and Loaded

HIOKI MR8848A961-00

*1. Multiple les can be registered in the instrument and loaded selectively. Automatic loading at power-on is also

possible. (p. 123)

*2. To load the data onto the instrument

Save the data in binary format. The waveform data and a part of the measurement settings data are saved.
To load the data onto the PC: Save the data in text format. (p. 101)
To save a portion of the waveform: Specify the range to be saved with Cursors A and B. (p. 146, p. 151)

*3. To load the data, which is saved with the memory division enabled, of entire blocks at once

Save measured data in the [ALL BLOCK] setting. A directory including waveform data for each block and index
data (SEQ) is automatically created. Load this index data.

To load waveform data that is saved using division save: Load the IDX index data.
*4. Load les with Wave Viewer (Wv).
*5. This is a standard Windows graphics format. Many graphics programs can open les in this format.
*6. You can print out text les created on a PC along with loaded waveforms. Other processing operations are not

available.

Files that exceed 2 GB cannot be saved.

Data that cannot be loaded onto the instrument

• Data saved by other instruments

• Image les other than waveform evaluation areas (

• Files displayed with the icon .

)

100