Hioki 8841 User manual

MEMORY HiCORDER
INSTRUCTION MANUAL
8841
8842

Contents
Introduction i
Inspection i
Safety Notes iii
Notes on Use v
Chapter Summary ix
Chapter 1 Product Overview 1
1.1 Major Features 1
1.2 Identification of Controls and Indicators 3
Chapter 2 Installation and Preparation 7
2.1 Installation of the Unit 7
2.2 Power Supply and Ground Connections 9
2.2.1 Connecting the AC Power Supply 9
2.2.2 Connecting the 9433 DC POWER ADAPTER 10
2.2.3 Functional Grounding of the 8841/8842 12
2.3 Power On/Off 13
2.4 Connection of the Input Unit 14
2.4.1 8936/ 8938/ 8946 ANALOG UNITs 14
2.4.2 8937 VOLTAGE/TEMP UNIT 15
2.4.3 8939 STRAIN UNIT 16
2.4.4 8940 F/V UNIT 17
2.4.5 8947 CHARGE UNIT 19
2.5 Logic Probe Connection 20
2.6 9018-10/9132-10 CLAMP ON PROBE 21
2.7 9322 DIFFERENTIAL PROBE Connection 22
2.8 Loading Recoding Paper 23
2.9 Care of Recording Paper 25
2.10 Notes on Measurement 26
2.10.1 Maximum Input Voltage 28
2.10.2 Using a Voltage Transformer 29
Chapter 3 Basic Key Operation 31
3.1 Basic Key Operation 31
3.1.1 Basic Display Operation (MENU) 31
3.1.2 Printer Key Operation 31
3.1.3 Setting the Items 32
3.1.4 Jog/Shuttle Controls and Select Key 32
3.1.5 Basic Input Operation 33
3.1.6 Measurement Start and Stop Operation 33

3.2 Other Keys Operation 34
3.3 Screen Configuration 35
Chapter 4 Memory Recorder Function 37
4.1 Overview of the Memory Recorder Function 37
4.2 Operation Sequence (MEM) 39
4.3 STATUS Settings (MEM) 41
4.3.1 Setting the Function Mode 42
4.3.2 Setting the Time Axis Range 42
4.3.3 Setting the Recording Length 43
4.3.4 Setting the Display Layout 44
4.3.5 Setting the Interpolation (dot-line) 46
4.3.6 Setting the Print Mode 46
4.3.7 Setting the Roll Mode 47
4.3.8 Setting the Auto Print Function 47
4.3.9 Setting the Auto Save Function 48
4.3.10 Setting the Overlay Function 50
4.3.11 Setting the Averaging Function 51
4.3.12 Setting the Waveform Evaluation 53
4.4 Using the X-Y Waveform Plots (MEM) 54
4.5 Settings on the Waveform Display Screen (MEM) 57
4.6 Auto Range Function 58
4.7 Other Screen Settings 60
4.8 Start and Stop Operation (MEM) 61
Chapter 5 Recorder Function 63
5.1 Overview of the Recorder Function 63
5.2 Operation Sequence (REC) 65
5.3 STATUS Settings (REC) 67
5.3.1 Setting the Function Mode 68
5.3.2 Setting the Time Axis Range 68
5.3.3 Setting the Sampling Period 69
5.3.4 Setting the Recording Length 69
5.3.5 Setting the Display Layout 70
5.3.6 Setting the Print Mode 73
5.3.7 Setting the Additional Recording Function 74
5.3.8 Setting the Printer Function (Real Time Printing) 75
5.3.9 Setting the Auto Save Function 76
5.3.10 Setting the Interpolation (dot-line, X-Y only) 77
5.3.11 Setting the Display Clear Function (X-Y only) 77
5.4 Using the X-Y CONT Recorder 78
5.4.1 Setting the Status Screen 79

5.4.2 Setting the Channel Screen 79
5.4.3 Setting the Display Screen 80
5.5 Settings on the Waveform Display Screen (REC) 81
5.6 Start and Stop Operation (REC) 82
Chapter 6 RMS Recorder Function 83
6.1 Overview of the RMS Recorder Function 83
6.2 Operation Sequence (RMS) 84
6.3 STATUS Settings (RMS) 86
6.3.1 Setting the Function Mode 87
6.3.2 Setting the Time Axis Range 87
6.3.3 Setting the Frequency 88
6.3.4 Setting the Recording Length 88
6.3.5 Setting the Display Layout 89
6.3.6 Setting the Print Mode 91
6.3.7 Setting the Additional Recording Function 92
6.3.8 Setting the Printer Function (Real Time Printing) 93
6.3.9 Setting the Auto Save Function 93
6.4 Settings on the Waveform Display Screen (RMS) 95
6.5 Start and Stop Operation (RMS) 96
Chapter 7 Recorder & Memory Function 97
7.1 Overview of the Recorder & Memory Function 97
7.2 Operation Sequence (REC&MEM) 98
7.3 STATUS Settings (REC&MEM) 100
7.3.1 Setting the Function Mode 101
7.3.2 Setting the Time Axis Range 102
7.3.3 Setting the Recording Length 103
7.3.4 Display Function 104
7.3.5 Setting the Display Layout 105
7.3.6 Setting the Print Mode 106
7.3.7 Setting the Additional Recording Function 107
7.3.8 Setting the Printer Function (Real-time Printing)
108
7.3.9 Setting the Auto Save Function 109
7.3.10 Setting the Real-Time Save 111
7.4 Settings on the Waveform Display Screen (REC&
MEM) 117
7.5 Start and Stop Operation (REC&MEM) 118

Chapter 8 FFT Function 119
8.1 Overview of the FFT Function 119
8.2 Operation Sequence (FFT) 120
8.3 STATUS1 Settings (FFT) 122
8.3.1 Setting the Function Mode 123
8.3.2 Setting the FFT Channel Mode 123
8.3.3 Setting the Frequency Range 124
8.3.4 FFT Number of Points Setup 125
8.3.5 Setting the Window Function 125
8.3.6 Setting the Display Format 126
8.3.7 Selecting Reference Data 128
8.3.8 Setting the FFT Analysis Mode 129
8.3.9 Setting the X-axis and Y-axis Displays 130
8.3.10 Setting the Analysis Channel 132
8.3.11 Setting the Display Scale 133
8.3.12 Octave Filter Setting 134
8.4 STATUS2 Settings (FFT) 135
8.4.1 Setting the Averaging Function 136
8.4.2 Setting the Interpolation (dot-line) 139
8.4.3 Setting the Print Mode 140
8.4.4 Setting the Auto Print Function 140
8.4.5 Setting the Auto Save Function 141
8.4.6 Setting the Waveform Evaluation 142
8.5 Settings on the Waveform Display Screen (FFT) 143
8.6 Start and Stop Operation (FFT) 144
8.7 FFT Analysis Function 145
8.7.1 Storage Waveform [STR] 145
8.7.2 Linear Spectrum [LIN] 146
8.7.3 RMS Spectrum [RMS] 148
8.7.4 Power Spectrum [PSP] 150
8.7.5 Auto Correlation [ACR] 152
8.7.6 Histogram [HIS] 153
8.7.7 Transfer Function [TRF] 154
8.7.8 Cross Power Spectrum [CSP] 156
8.7.9 Cross Correlation [CCR] 158
8.7.10 Unit Impulse Response [IMP] 159
8.7.11 Coherence [COH] 160
8.7.12 Octave Analysis [OCT] 161

Chapter 9 Input Channel Settings 165
9.1 Overview 165
9.2 Operation Procedure (Input Channel Setting) 166
9.3 Setting the CHANNEL Screen 168
9.3.1 Setting the Waveform Display Color 169
9.3.2 Setting the Waveform Display Graph Position 169
9.3.3 Setting the Voltage Axis Range 170
9.3.4 Setting the Input Coupling 170
9.3.5 Setting the Magnification/Compression Ratio
Along the Voltage Axis 171
9.3.6 Setting the Zero Position 172
9.3.7 Setting the Low-pass Filter 173
9.3.8 Setting the Logic Inputs 174
9.4 Copying Channel Settings 175
9.5 Zero Settings 176
9.5.1 Zero Adjustment 176
9.5.2 Zero Offset Setup 177
9.6 Channel Guide Function 179
9.7 Setting the Variable Function 180
9.8 Scaling Function (SYSTEM2) 182
9.8.1 Setting the Scaling Function 183
9.8.2 Scaling Setting Example 186
9.9 Comment Function (SYSTEM 3) 187
9.9.1 Title Comment Entry 187
9.9.2 Analog/Logic Channel Comment Entry 188
9.9.3 Character Entry Procedure 189
9.10 Setting the Waveform Display Screen 191
9.10.1 Entering by CH.SET Key 191
9.10.2 Setting the Vernier Function 192
9.10.3 Direct Channel Setting 193
9.11 Setting the 8937 VOLTAGE/TEMP UNIT 194
9.11.1 Making the Settings of Voltage Measurement 194
9.11.2 Making the Settings of Temperature
Measurement 196
9.12 8938 FFT ANALOG UNIT 199
9.13 Setting the 8939 STRAIN UNIT 200
9.14 8940 F/V UNIT 201
9.14.1 Frequency Measurement 202
9.14.2 Setting the Count Mode 205
9.14.3 Setting the Pulse Duty Ratio Mode 207
9.14.4 Setting the Voltage Mode 209

9.14.5 Setting the Current Measurement 211
9.15 Setting the 8947 CHARGE UNIT 212
9.15.1 Acceleration Measurement (Charge/Preamp)
Selection 213
9.15.2 Setting the Sensor Sensitivity 215
9.15.3 Setting the Voltage Measurement 216
Chapter 10 Trigger Functions 217
10.1 Overview of the Trigger Functions 217
10.2 Operation Sequence (Trigger mode setting) 218
10.3 TRIGGER Screen Organization 220
10.4 Trigger Mode 221
10.5 Pre-trigger 222
10.6 Trigger Timing (REC only) 224
10.7 Trigger Source AND/OR Linking 225
10.8 Analog Trigger 226
10.8.1 Level Trigger 226
10.8.2 Window Trigger 229
10.8.3 Voltage Drop Trigger 231
10.8.4 Period Trigger 233
10.8.5 RMS Level Trigger 236
10.9 Logic Trigger 238
10.10 External Trigger Function 240
10.11 Timer Trigger Function 241
10.12 Manual Trigger 244
10.13 Trigger Output Terminal 244
Chapter 11Waveform Display Screen Operation 245
11.1 Scrolling the Waveform 246
11.2 Using the A･B Cursors 247
11.2.1 Using the Line Cursors (Vertical) 248
11.2.2 Using the Line Cursors (Horizontal) 249
11.2.3 Using the Trace Cursors 250
11.2.4 Using the A･B Cursors (X-Y Screen) 252
11.3 Magnification/compression Ratio Along the Time
Axis 253
11.4 Zoom Function (MEM only) 254
11.5 Input Level Monitor Function 255
11.6 View Function (VIEW key) 256
11.6.1 Position Display 256
11.6.2 Block Display (MEM only) 257

Chapter 12 SYSTEM Screen Settings 259
12.1 Overview 259
12.2 SET UP Screen (SYSTEM 1) 260
12.2.1 Using Channel (MEM only) 260
12.2.2 Start Backup 261
12.2.3 Backlight Saver 261
12.2.4 Display Color 262
12.2.5 Beep Sound 262
12.2.6 Display Language 263
12.2.7 Grid Type 263
12.2.8 Channel Marker 263
12.2.9 Time Value 264
12.2.10 List & Gauge 264
12.2.11 Printer Density 264
12.2.12 Upper-lower Values Print 264
12.2.13 0 Position Comment 265
12.2.14 Counter Print 265
12.2.15 Numerical Input 265
12.2.16 Variable Auto Calibration 266
12.3 SCALING Screen (SYSTEM 2) 266
12.4 COMMENT Screen (SYSTEM 3) 267
12.5 INTERFACE Screen (SYSTEM 4) 268
12.5.1 Output Destination by the COPY Key 269
12.5.2 Output Destination by the PRINT Key 269
12.5.3 Interface Settings 269
12.5.4 Setting the SCSI ID 270
12.5.5 Setting the Internal MO (when the 9607 is
installed) 270
12.5.6 Setting the LAN 271
12.6 INITIALIZE Screen 278
12.6.1 Setting the Clock 278
12.6.2 Clearing the Waveform Data 278
12.6.3 System Reset 279
12.6.4 List System Configuration 279
12.7 Self-check 280
12.7.1 ROM/RAM Check 280
12.7.2 Printer Check 280
12.7.3 Display Check 281
12.7.4 Key Check 281
12.7.5 PC Card Check 281

Chapter 13 Printout of Measurement Data 283
13.1 Printout of Measurement Data Operating
Procedure 284
13.2 Setting the STATUS Screen (printout) 286
13.2.1 Setting the Display Format 286
13.2.2 Setting the Print Mode 287
13.3 Setting the CHANNEL Screen (printout) 288
13.3.1 Setting the Print Density 288
13.3.2 Setting the Waveform Display Graph Position 289
13.4 Setting the SYSTEM Screen (printout) 290
13.4.1 SET UP Screen (SYSTEM 1) 290
13.4.2 SCALING Screen (SYSTEM 2) 292
13.4.3 COMMENT Screen (SYSTEM 3) 292
13.4.4 Setting the Output Destination by the COPY
Key 293
13.4.5 Setting the Output Destination by the PRINT
Key 294
13.5 Example of Printer Output 296
13.6 Printing Procedure 303
13.6.1 Manual Print 303
13.6.2 Auto Print 304
13.6.3 Real Time Print 305
13.6.4 Partial Print 306
13.6.5 Screen Hard Copy 307
13.6.6 List Print 307
13.6.7 Report Print 307
13.7 External Printer (color print) 308
Chapter 14 Storing Measurement Data 311
14.1 Floppy Disk 312
14.2 9607 MO UNIT (Option) 313
14.2.1 Setting the Internal MO 314
14.3 PC Card 315
14.3.1 Using the PC Card Slot (PC Card with a
Cable Only) 316
14.4 SCSI Interface 317
14.4.1 SCSI Interface Specifications 317
14.4.2 Setting the MO Disk Drive 318
14.4.3 Setting the SCSI ID 319
14.5 Selecting the Media Type 320
14.6 Initializing (FORMAT) 321
14.7 Saving the Data (SAVE) 322

14.7.1 Setting the Data to Store 324
14.8 Loading the Data (LOAD) 331
14.9 File Information (INFO) 335
14.10 Deleting the Data (DELETE) 336
14.11 Sorting Files (SORT) 337
14.12 Operating the Directory 338
14.12.1 Making a Directory (MK DIR) 338
14.12.2 Changing a Directory (CH DIR) 339
14.12.3 Deleting a Directory (RM DIR) 340
14.13 Printing the File List 341
Chapter 15 Memory Segmentation Function 343
15.1 Using the Sequential Save Function 344
15.2 Using the Multi-Block Function (MEM) 349
Chapter 16 Waveform Operation Function 353
16.1 Waveform Parameter Calculation (MEM) 353
16.1.1 Making Settings for Waveform Parameter
Calculation 355
16.1.2 Making Settings for Waveform Parameter
Evaluation 357
16.1.3 Setting the Waveform Parameter GO/NG
Stop Mode 358
16.1.4 Executing Waveform Parameter Calculation 359
16.2 Calculating Waveform Data 361
16.2.1 Preparing for Waveform Processing 362
16.2.2 Defining the Processing Equation 363
16.2.3 Copying an Equation 366
16.2.4 Setting the Channel for Recording Processing
Results 367
16.2.5 Setting the Display Scale and Number of
Moved Points 368
16.2.6 Perform Waveform Processing 370
16.3 Waveform GO/NG Evaluation (MEM, FFT) 372
16.3.1 Setting the Waveform Area 374
16.3.2 Setting the Waveform Evaluation Mode 375
16.3.3 Setting the GO/NG Stop Mode 375
16.3.4 Creating the Evaluation Area 376
16.3.5 Editor Command Details 376

Chapter 17 External Input/ Output Terminals/ Key Lock
Function 379
17.1 External Input/Output Terminals 379
17.1.1 Connecting the Terminals 379
17.1.2 External Trigger Input Terminal [EXT TRIG] 380
17.1.3 Trigger Output Terminal [TRIG OUT] 380
17.1.4 External Sampling Terminal [EXT SMPL] 381
17.1.5 External Print Terminal / External Start/Stop
Terminal 381
17.1.6 GO/NG Evaluation Output Terminal 382
17.2 Using the Key Lock Function 383
Chapter 18 Specifications 385
18.1 General Specifications 385
18.2 External Data Storage and Interface 387
18.3 Trigger Unit 389
18.4 Memory Recorder Function 390
18.5 Recorder Function 391
18.6 RMS Recorder Function 392
18.7 Recorder & Memory Function 393
18.8 FFT Function 394
18.9 Auxiliary Functions 395
18.10 Others 396
18.11 System Operation 397
18.12 Maximum Recording Length for Time Axis
Settings 398
18.13 Memory Capacity and Recording Length 400
Chapter 19 Logic and Analog Inputs 401
19.1 Logic Inputs 401
19.2 Analog Inputs 403
19.2.1 8936 ANALOG UNIT 403
19.2.2 8937 VOLTAGE / TEMP UNIT 404
19.2.3 8938 FFT ANALOG UNIT 406
19.2.4 8939 STRAIN UNIT 407
19.2.5 8946 4ch ANALOG UNIT 408
19.2.6 8940 F/V UNIT 409
19.2.7 8947 CHARGE UNIT 411

Chapter 20 Maintenance and Service 415
20.1 Maintenance and Inspection 415
20.2 Replacing the Input Units 417
20.3 Replacing the Fuse of the 9433 418
20.4 Removing the Battery Before Discarding the Unit 419
20.5 Troubleshooting 420
Appendix APPENDIX 1
Appendix 1 Error Messages APPENDIX 1
Appendix 2 Glossary APPENDIX 6
Appendix 3 Reference APPENDIX 8
Appendix 3.1 Sampling APPENDIX 8
Appendix 3.2 Aliasing APPENDIX 8
Appendix 3.3 Measurement Limit Frequency APPENDIX 9
Appendix 3.4 Recorder Function APPENDIX 10
Appendix 3.5 RMS Recorder Function APPENDIX 11
Appendix 3.6 Averaging Equations APPENDIX 12
Appendix 3.7 "2-point method" Scaling Equation
APPENDIX 12
Appendix 3.8 Waveform Parameter Calculation Details
APPENDIX 13
Appendix 3.9 Details on Operators APPENDIX 16
Appendix 3.10 FFT Function APPENDIX 19
Appendix 4 Size of a Waveform File (Binary data)
APPENDIX 26
Appendix 5 Size of a Waveform File (Reference value
of text data) APPENDIX 28
Appendix 6 FFT File Size APPENDIX 30
Appendix 7 Real-Time Save Files Size (Memory data)
APPENDIX 31
Appendix 8 Waveform Viewer (Wv) APPENDIX 32
Appendix 8.1 Starting the Waveform Viewer
APPENDIX 33
Appendix 8.2 Waveform Viewer Menus APPENDIX 34
Appendix 8.3 Using the Waveform Viewer APPENDIX 36
Appendix 8.4 Conversion to CSV Format APPENDIX 39
Appendix 8.5 Batch Conversion APPENDIX 40
Index INDEX 1

i
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Introduction
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Introduction
Inspection
Thank you for purchasing the HIOKI "8841/42 MEMORY HiCORDER."
To obtain maximum performance from the product, please read this manual
first, and keep it handy for future reference.
When the unit is delivered, check and make sure that it has not been
damaged in transit. In particular, check the accessories, panel switches, and
connectors. If the unit is damaged, or fails to operate according to the
specifications, contact your dealer or HIOKI representative.
Accessories
Power cord 1 9231 RECORDING PAPER 1
Protective cover 1 Roll paper attachment 2
PC card protector 1 Connector cable label 1
Instruction Manual 1 Application Disk (CD-R) 1
Options
Input units 8936 ANALOG UNIT
8937 VOLTAGE/TEMP UNIT
8938 FFT ANALOG UNIT
8939 STRAIN UNIT
8940 F/V UNIT
*18946 4 ch ANALOG UNIT
8947 CHARGE UNIT
Cards
9557 RS-232C CARD
9558 GP-IB CARD
9559 PRINTER CARD
9578 10BASE-T LAN CARD
9607 MO UNIT (with eject pin)
9608 MEMORY BOARD (24M-WORD）total 32 M words
9626 PC CARD 32M
9627 PC CARD 64M
9726 PC CARD 128M
9727 PC CARD 256M
9728 PC CARD 512M
9729 PC CARD 1G
Cables and adapter
9433 DC POWER ADAPTER
9197 CONNECTION CORD (for high voltage, maximum input voltage 500 V)
9198 CONNECTION CORD (for low voltage, maximum input voltage 300 V)
9199 CONVERSION ADAPTOR
9217 CONNECTION CORD (isolated between BNC and BNC)
9320 LOGIC PROBE (maximum input voltage 50 V)
9321 LOGIC PROBE (maximum input voltage 250 V)
9322 DIFFERENTIAL PROBE

ii
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Inspection
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NOTE
9324 POWER CORD (for logic connector)
9325 POWER CORD (for 8940 F/V UNIT sensor connector)
9665 10:1PROBE
9666 100:1PROBE
*29303 PT
9318 CONVERSION CABLE (for 9270-72, 9277-79)
9319 CONVERSION CABLE (for 3273)
Clamps
3273 CLAMP ON PROBE (DC to 50 MHz)
9018-10 CLAMP ON PROBE (10 to 500 A, 40 Hz to 3 kHz)
*29132-10 CLAMP ON PROBE (20 to 1000 A, 40 Hz to 1 kHz)
*29270 CLAMP ON SENSOR (20 A, 5 Hz to 50 kHz)
*29271 CLAMP ON SENSOR (200 A, 5 Hz to 50 kHz)
*29272 CLAMP ON SENSOR (20/200 A,5Hzto10kHz)
9277 UNIVERSAL CLAMP ON CT (20 A, DC to 100 kHz)
9278 UNIVERSAL CLAMP ON CT (200 A, DC to 100 kHz)
*29279 UNIVERSAL CLAMP ON CT (500 A, DC to 20 kHz)
*29555 SENSOR UNIT (used with the 9270 to 9272, and the 9277 to 9279)
Others
8910 CAN ADAPTER
9333 LAN COMMUNICATOR
9335 WAVE PROCESSOR
9397-01 CARRYING CASE (for 8841)
9349 CARRYING CASE (for 8842)
9231 RECORDING PAPER (6 rolls)
*2220H PAPER WINDER
*1: Only used with 8841/ *2: no CE marking
The 9270 to 9272 CLAMP ON SENSORs and 9277 to 9279 UNIVERSAL
CLAMP ON CTs are designed for use only with the 9555 SENSOR UNIT,
and cannot be used alone.

iii
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Safety Notes
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DANGER This product is designed to conform to IEC 61010 Safety
Standards, and has been thoroughly tested for safety prior to
shipment. However, mishandling during use could result in
injury or death, as well as damage to the product. Be certain
that you understand the instructions and precautions in the
manual before use. We disclaim any responsibility for
accidents or injuries not resulting directly from product
defects.
Safety symbols
In the manual, the symbol indicates particularly important
information that the user should read before using the product.
The symbol printed on the product indicates that the user
should refer to a corresponding topic in the manual (marked with
the symbol) before using the relevant function.
Indicates a grounding terminal.
Indicates AC (Alternating Current).
Indicates DC (Direct Current).
Indicates both DC (Direct Current) and AC (Alternating Current).
Indicates the ON side of the power switch.
Indicates the OFF side of the power switch.
Safety Notes
This manual contains information and warnings essential for safe operation
of the product and for maintaining it in safe operating condition. Before
using the product, be sure to carefully read the following safety notes.

iv
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Safety Notes
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DANGER Indicates that incorrect operation presents extreme danger of
accident resulting in death or serious injury to the user.
WARNING Indicates that incorrect operation presents significant danger of
accident resulting in death or serious injury to the user.
CAUTION Indicates that incorrect operation presents possibility of injury
to the user or damage to the equipment.
NOTE Denotes items of advice related to performance of the
equipment or to its correct operation.
CATⅠSecondary electrical circuits that are connected to a wall outlet through a
transformer or similar device.
CATⅡPrimary electrical circuits in equipment connected to a wall outlet via a
power cord (portable tools, household appliances, etc.)
CATⅢPrimary electrical circuits of heavy equipment (fixed installations)
connected directly to the distribution panel, and feeders between the
distribution panel and outlets.
CATⅣThe circuit from the service drop to the service entrance, then to the
power meter and to the primary overcurrent protection device.
The following symbols are used in this Instruction Manual to indicate the
relative importance of cautions and warnings.
Measurement categories (Overvoltage categories)
This instrument conforms to the safety requirements for CAT II (370 V)
measurement products (using with the 8936 ANALOG UNIT).
To ensure safe operation of measurement instruments, IEC 61010 establishes
safety standards for various electrical environments, categorized as CAT I to
CAT IV, and called measurement categories. These are defined as follows.
Higher-numbered categories correspond to electrical environments with
greater momentary energy. So a measurement device designed for CAT III
environments can endure greater momentary energy than a device designed
for CAT II. Using a measurement 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 CAT I measuring instrument in CAT II, III, or IV environments.
The measurement categories comply with the Overvoltage Categories of the
IEC60664 Standards.

v
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Notes on Use
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DANGER Power Supply Connections
Before connecting the unit, make sure that the power supply
voltage matches the rated power supply voltage of the unit.
Probe Connection, Measurement Voltage Input
Maximum input voltage ratings for the input unit and the input terminals
of the unit are shown below. To avoid the risk of electric shock and
damage to the unit, take care not to exceed these ratings.
The maximum rated voltage to earth of the input unit (voltage
between input terminals and main unit frame ground, and between
inputs of other analog units) is shown below. To avoid the risk of
electric shock and damage to the unit, take care that voltage
between channels and between a channel and ground does not
exceed these ratings.
The maximum rated voltage to earth rating applies also if an input
attenuator or similar is used. Ensure that voltage does not exceed
these ratings.
When measuring power line voltages with the 8936 or 8938, always
connect the probe to the secondary side of the circuit breaker.
Connection to the primary side involves the risk of electric shock
and damage to the unit.
Always use the supplied connector cables. Any exposed metal
sections in a connector cable consist a risk of electric shock.
The logic units all have and the unit have a common ground.
The external I/O terminal and the unit have a common GND.
Notes on Use
Input/output terminal Maximum input voltage Maximum rated voltage to earth
8936 (input) 400 VDC max. 370 VAC/DC
8937 (input) 30 Vrms or 60 VDC 30 Vrms or 60 VDC
8938 (input) 400 VDC max. 370 VAC/DC
8939 (input) 10 VDC max. 30 Vrms or 60 VDC
8940 (input) 30 Vrms or 60 VDC
(BNC/sensor connector terminal)
30 Vrms or 60 VDC (BNC terminal)
Not insulated (Sensor connector terminal)
8946 (input) 30 Vrms or 60 VDC 30 Vrms or 60 VDC
8947 (input) *1 30 Vrms or 60 VDC (BNC terminal) 30 Vrms or 60 VDC (BNC terminal)
*1: The maximum allowable charge that can be applied to the miniature connection terminals is 500 pC at the most
sensitive of the six ranges, and 50,000 pC at the least sensitive range.
In order to ensure safe operation and to obtain maximum performance from
the unit, observe the cautions listed below.
Inspection before Use
Before using the product the first time, verify that it operates normally to
ensure that the no damage occurred during storage or shipping. If you find
any damage, contact your dealer or Hioki representative.

vi
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Notes on Use
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DANGER Logic Probe Connection
The logic input and 8841/42 Unit share a common ground. Therefore, if
power is supplied to the measurement object of the logic probe and to
the 8841/42 from different sources, an electric shock or damage to the
equipment may result. Even if power is supplied from the same system,
if the wiring is such that a potential difference is present between the
grounds, current will flow through the logic probe so that the
measurement object and 8841/42 could be damaged. We therefore
recommend the following connection method to avoid this kind of
result. Refer to Section 2.5, "Logic Probe Connection" for details.
(1) Before connecting the logic probe to the measurement object, be sure
that power is supplied from the same outlet box to the measurement
object and the 8841/42 using the supplied power cord.
(2) Before connecting the logic probe to the measurement object,
connect the ground of the measurement object to the 8841/42
ground terminal. Also in this case, power should be supplied from
the same source. Refer to Section 2.2, "Power Supply and Ground
Connections" for grounding terminal details.
Replacing the Input Units
In order to avoid accidents from electric shock, before removing or
replacing an input unit, check that the connector cables and
thermocouple are disconnected, turn off the power, and remove the
power cable.
Normally keep all input units installed permanently. If a unit is not
fitted, it must be replaced by a blanking panel. If the unit is
operated with an input unit not in place it poses a shock hazard.
Differential Probe Connection
When using grabber clips, the 9322's maximum rated voltage to
earth is 1500 VAC/DC; when using alligator clips, it is 1000 VAC/DC.
To avoid electrical shock and possible damage to the unit, never
apply voltages greater than these limits between the input channel
terminals and chassis, or across the inputs of two 9322s.
Maximum input voltage is 1000 VAC/2000 VDC. Do not measure
voltage in excess of these limitations, as doing so may damage the
unit or cause an accident that might result in injury or death.
Input/output terminal Maximum input voltage Maximum rated voltage to earth
9322
2000 VDC, 1000 VAC (CAT II)
600 VAC/DC (CAT III)
When using grabber clips
1500 VAC/DC (CAT II), 600 VAC/DC (CAT III)
When using alligator clips
1000 VAC/DC (CAT II), 600 VAC/DC (CAT III)
EXT TRIG/ START・STOP/
PRINT/ EXT SMPL -5 to +10 VDC
Not insulated
TRIG OUT/ GO/ NG -20 V to +30 VDC
500 mA max./ 200 mW max.