Hioki 8855 Instruction Manual

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Instruction Manual

8855

MEMORY HiCORDER

December 2008 Revised edition 9 8855A988-09 08-12H

Contents

Introduction i Inspection ii Safety Notes iv Notes on Use vi Chapter Summary xi

Chapter 1 Product Overview 1

1.1 Major Features 2

1.2 Identification of Controls and Indicators

Chapter 2 Installation and Preparation 9

2.1 Installation of the Product 9

2.2 Power Supply and Ground Connections

2.2.1 Connecting the AC Power Supply 11

2.2.2 Functional Grounding of the 8855 12

2.3 Power On/Off 13

2.4 Connection of the Input Product

2.4.1 8950, 8952, 8953-10, 8955 INPUT UNITs 14

2.4.2 8951 VOLTAGE/CURRENT UNIT 15

2.4.3 8954 VOLTAGE/TEMP UNIT 18

2.5 Logic Probe Connection 20

2.6 9018-10, 9132-10 CLAMP ON PROBE Connection

2.7 9322 DIFFERENTIAL PROBE Connection

21 22

2.8 9665 10:1 PROBE / 9666 100:1 PROBE

2.9 Loading Recording Paper

(when the 8994 PRINTER UNIT is installed)

2.10 Care of Recording Paper

2.11 Notes on Measurement

2.11.1 Maximum Input Voltage 29

2.11.2 Using a Voltage Transformer 30

24 26 27

Chapter 3 Recorder & Memory Function 31

3.1 Overview of the Recorder & Memory Function 31

3.2 Operation Sequence (REC&MEM)

3.3 STATUS Settings (REC&MEM: STATUS Screen)

3.3.1 Setting the Function Mode 35

3.3.2 Setting the Time Axis Range 36

3.3.3 Setting the Recording Length 37

3.3.4 Display Function 38

3.3.5 Setting the Display Format 39

32 34

3.4 Setting the Additional Recording Function 40

3.5 Settings on the Waveform Display Screen (REC&MEM)

3.6 Setting The Printer (Only When The 8994 PRINTER UNIT Is Installed)

3.6.1 Setting the Print Mode 43

3.6.2 Setting the Real-time Printing Function 44

3.7 Setting the Auto Save Function 45

3.8 Simultaneous Display of Recorder and Memory Waveforms

3.9 Start and Stop Operation (REC&MEM)

Chapter 4 FFT Function 49

4.1 Overview of the FFT Function 49

4.2 Operation Sequence (FFT)

4.3 STATUS Settings (FFT)

4.3.1 Setting the Function Mode 53

4.3.2 Setting the FFT Channel Mode 53

4.3.3 Setting the Frequency Range 54

4.3.4 FFT Number of Points Setup 55

4.3.5 Setting the Window Function 56

4.3.6 Setting the Peak Function 57

4.3.7 Selecting Reference Data 58

4.3.8 Setting the Display Format 59

4.3.9 Setting the Averaging Function 60

4.3.10 Setting the Interpolation (dot-line) 63

50 52

4.3.11 Setting the Waveform Evaluation 64

4.3.12 Setting the FFT Analysis Mode 65

4.3.13 Setting the Analysis Channel 66

4.3.14 Setting the X-axis and Y-axis Displays 67

4.3.15 Setting the Wave Colors 69

4.3.16 Setting the Display Scale 70

4.3.17 Octave Filter Setting 71

4.4 Printout of FFT Processing Results (When 8994 PRINTER UNIT is installed.) 72

4.4.1 Setting the Print Mode 72

4.4.2 Setting the Auto Print Function 72

4.5 Setting the Auto Save Function 73

4.6 Settings on the Waveform Display Screen (FFT)

4.7 Start and Stop Operation (FFT)

4.8 FFT Analysis Function

4.8.1 Storage Waveform [STR] 77

4.8.2 Linear Spectrum [LIN] 78

4.8.3 RMS Spectrum [RMS] 80

4.8.4 Power Spectrum [PSP] 81

4.8.5 Auto Correlation [ACR] 83

4.8.6 Histogram [HIS] 84

4.8.7 Transfer Function [TRF] 85

4.8.8 Cross Power Spectrum [CSP] 87

4.8.9 Cross Correlation [CCR] 89

4.8.10 Unit Impulse Response [IMP] 90

4.8.11 Coherence [COH] 91

4.8.12 Octave Analysis [OCT] 92

75 76 77

Chapter 5 Input Channel Settings 97

5.1 Overview 98

5.2 Setting the Variable Function

5.3 Scaling Function (SYSTEM)

5.3.1 Setting the Scaling Function 103

5.3.2 Scaling Setting Example 106

102

5.4 Comment Function (CHANNEL) 107

5.4.1 Title Comment Entry 107

5.4.2 Analog/Logic Channel Comment Entry 108

5.4.3 Character Entry Procedure 109

5.5 Copying Channel Settings 110

5.6 Setting the Waveform Display Screen

5.6.1 Entering by F9 (CH.SET) Key 111

5.6.2 Entering by CH.SET Key 112

5.6.3 Setting the Vernier Function 113

111

5.7 Setting the Probe Voltage Division Ratio 114

5.8 Setting the 8951 VOLTAGE/CURRENT UNIT 116

5.8.1 Setting Voltage Measurement 116

5.8.2 Setting Current Measurement 116

5.9 Setting the 8952 DC/RMS UNIT 118

5.9.1 Setting Voltage Measurement 118

5.9.2 Setting RMS Measurement 118

5.10 8953-10 HIGH RESOLUTION UNIT 120

5.11 Setting the 8954 VOLTAGE/TEMP UNIT

5.11.1 Setting Voltage Measurement 121

5.11.2 Setting Temperature Measurement 121

121

5.12 Setting the 8955 F/V UNIT 124

5.12.1 Frequency, Rotation, and Commercial Power Frequency Measurement Settings 124

5.12.2 Integration Measurement Settings 127

5.12.3 Pulse Duty Ratio Measurement Settings 128

5.12.4 Pulse Width Measurement Settings 129

Chapter 6 Memory Segmentation Function 131

Chapter 7 Calculation Function 137

7.1 Numerical Calculation (MEM) 137

7.1.1 Making Settings for Numerical Calculation 139

7.1.2 Copying Calculations Settings 142

7.1.3 Making Settings for Numerical Evaluation 143

7.1.4 Executing Numerical Calculation 145

7.2 Waveform Calculation (MEM) 147

7.2.1 Preparing for Waveform Processing 148

7.2.2 Defining the Processing Equation 149

7.2.3 Copying an Equation 151

7.2.4 Setting the Channel for Recording Processing

Results 152

7.2.5 Setting the Display Scale 153

7.2.6 Perform Waveform Processing 155

Chapter 8 Search Function 157

8.1 View Function (VIEW key) 158

8.1.1 Position Display 158

8.1.2 Block Display 159

8.2 Trigger Search 160

8.3 Peak Search Function

162

8.4 Event Search 163

8.5 Time Search

8.6 Moving Cursors to the Search Points

164 165

Chapter 9 Waveform Evaluation Function 167

9.1 Waveform GO/NG Evaluation (MEM, FFT Function, Power Monitor Function)

9.2 Setting the Waveform Area

9.3 Setting the Waveform Evaluation Mode

9.4 Setting the GO/NG Stop Mode

9.5 Creating the Evaluation Area

9.6 Editor Command Details

167 170 171 171 172 172

Chapter 10 Printout of Measurement Data 175

10.1 Printout of Measurement Data Operating

Procedure 176

10.2 Setting the STATUS Screen (printout)

178

10.2.1 Setting the Display Format 178

10.2.2 Setting the Waveform Display Graph Position 179

10.3 Setting the CHANNEL Screen (printout) 180

10.3.1 Setting the Print Density 180

10.3.2 SCALING Screen 180

10.3.3 COMMENT Screen 181

10.4 Setting the SYSTEM Screen (printout) 182

10.5 Example of Printer Output

10.6 Printing Procedure

10.6.1 Manual Print 186

10.6.2 Auto Print 187

10.6.3 Real Time Print 188

10.6.4 Partial Print 189

10.6.5 Screen Hard Copy 190

10.6.6 List Print 190

10.6.7 Report Print 190

183 186

Chapter 11 Communication Settings 191

11.1 INTERFACE Screen (LAN Interface) 191

11.2 FTP Service

11.3 PPP connection

11.4 PC Card Interface

197 199 202

Appendix APPENDIX 1

Appendix 1 Error Messages APPENDIX 1 Appendix 2 Glossary Appendix 3 Reference

Appendix 3.1 Sampling APPENDIX 6

Appendix 3.2 Aliasing APPENDIX 6

Appendix 3.3 Measurement Limit

Frequency APPENDIX 7

Appendix 3.4 Recorder Function APPENDIX 8

Appendix 3.5 Averaging Equations APPENDIX 9

Appendix 3.6 "2-point method" Scaling

Equation APPENDIX 9

Appendix 3.7 Waveform Parameter

Calculation Details APPENDIX 10

Appendix 3.8 Details on Operators APPENDIX 14

Appendix 3.9 FFT Function APPENDIX 17

APPENDIX 4 APPENDIX 6

Appendix 4 Waveform Viewer (Wv) APPENDIX 24

Appendix 4.1 Starting the Waveform

Viewer APPENDIX 25

Appendix 4.2 Waveform Viewer Menus APPENDIX 26

Appendix 4.3 Using the Waveform

Viewer APPENDIX 28

Appendix 4.4 Conversion to CSV Format

APPENDIX 31

Appendix 4.5 Batch Conversion APPENDIX 32

Appendix 5 Size of a Waveform File APPENDIX 33

INDEX INDEX 1

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Introduction

Thank you for purchasing the HIOKI "8855 MEMORY HiCORDER." To obtain maximum performance from the instrument, please read this manual first, and keep it handy for future reference.

About This Manual

This manual is the Advanced edition (Instruction Manual) for the "8855 MEMORY HiCORDER." It describes the advanced functions and procedures for the 8855. For information on general functions and procedures, refer to the Basics edition (Quick Start Manual) of this manual.

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Introduction

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Inspection

When you receive the instrument, inspect it carefully to ensure that no damage occurred during shipping. In particular, check the accessories, panel switches, and connectors. If damage is evident, or if it fails to operate according to the specifications, contact your dealer or Hioki representative.

Accessories

Power cord 1 9231 RECORDING PAPER (when the 8994 PRINTER UNIT is installed) Roll paper attachment (when the 8994 PRINTER UNIT is installed) PC card protector Connector cable label Instruction Manual Guide book Application Disk (CD-R)

1 2 1 1 1 1 1

Options

8950 ANALOG UNIT 8951 VOLTAGE/CURRENT UNIT 8952 DC/RMS UNIT 8953-10 HIGH RESOLUTION UNIT 8954 VOLTAGE/TEMP UNIT 8955 F/V UNIT 8994 PRINTER UNIT 9646 MO UNIT (with eject pin) 9663 HD UNIT 9645 MEMORY BOARD (96 M words) total 128 M words 9645-01 MEMORY BOARD (512 M words) total 512 M words 9557 RS-232C CARD 9558 GP-IB CARD 9626 PC CARD 32M 9627 PC CARD 64M 9726 PC CARD 128M 9727 PC CARD 256M 9728 PC CARD 512M 9729 PC CARD 1G 9397-01 CARRYING CASE (for the 8855) 9231 RECORDING PAPER (6 rolls) 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 (between BNC and banana, female) 9217 CONNECTION CORD (isolated between BNC and BNC) 9327 LOGIC PROBE (maximum input voltage 50 V) 9321-01 LOGIC PROBE (maximum input voltage 250 V) 9665 10:1PROBE 9666 100:1PROBE 9322 DIFFERENTIAL PROBE 9328 POWER CORD (for the 9322) 9325 POWER CORD (for the 8951)

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Inspection

iii

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220H PAPER WINDER

9303 PT 9318 CONVERSION CABLE (for the 9270 to 9272, 9277 to 9279) 3273 CLAMP ON PROBE (DC to 50 MHz) 3273-50 CLAMP ON PROBE (DC to 50 MHz) 3274 CLAMP ON PROBE (DC to 10 MHz) 3275 CLAMP ON PROBE (DC to 2 MHz) 3276 CLAMP ON PROBE (DC to 100 MHz) 9018-10 CLAMP ON PROBE (10 to 500 A, 40 Hz to 3 kHz)

9132-10 CLAMP ON PROBE (20 to 1000 A, 40 Hz to 1 kHz)

9270 CLAMP ON SENSOR (20 A, 5 Hz to 50 kHz)

9271 CLAMP ON SENSOR (200 A, 5 Hz to 50 kHz)

9272 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)

9279 UNIVERSAL CLAMP ON CT (500 A, DC to 20 kHz)

9555 SENSOR UNIT (used with the 9270 to 9272, and the 9277 to 9279) 9667 FLEXIBLE CLAMP ON SENSOR

(500 to 5000 A/50 to 500 A, 10 to 20 kHz) 9333 LAN COMMUNICATOR 9335 WAVE PROCESSOR 9549 FUNCTION UP DISK (power monitor function)

*: no CE marking

NOTE

To connect the 9270 to 9272 or 9277 to 9279 Clamp-On Sensor to the 8951 VOLTAGE/CURRENT UNIT, use the 9318 CONVERSION CABLE. To connect these sensors to other instruments, use in combination with the 9555 SENSOR UNIT.

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Inspection

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Safety Notes

This manual contains information and warnings essential for safe operation of the instrument and for maintaining it in safe operating condition. Before using the instrument, be sure to carefully read the following safety notes.

DANGER

Safety symbols

This instrument is designed to comply with 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 instrument. 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 instrument defects.

The symbol printed on the instrument indicates that the user should refer to a corresponding topic in the manual (marked with the symbol) before using the relevant function. In the manual, the symbol indicates particularly important information that the user should read before using the instrument.

Indicates a grounding terminal.

Indicates AC (Alternating Current).

DANGER

WARNING

CAUTION

NOTE

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.

The following symbols in this manual indicate the relative importance of cautions and warnings.

Indicates that incorrect operation presents an extreme hazard that could result in serious injury or death to the user.

Indicates that incorrect operation presents a significant hazard that could result in serious injury or death to the user.

Indicates that incorrect operation presents a possibility of injury to the user or damage to the instrument.

Indicates advisory items related to performance or correct operation of the instrument.

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Safety Notes

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Measurement categories (Overvoltage categories)

This instrument complies with CAT II safety requirements. 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.

CAT I

CAT II

CAT III

CAT IV

Secondary electrical circuits connected to an AC electrical outlet through a transformer or similar device.

Primary electrical circuits in equipment connected to an AC electrical outlet by a power cord (portable tools, household appliances, etc.)

Primary electrical circuits of heavy equipment (fixed installations) connected directly to the distribution panel, and feeders from the distribution panel to outlets.

The circuit from the service drop to the service entrance, and to the power meter and primary overcurrent protection device (distribution panel).

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.

Accuracy

We define measurement tolerances in terms of f.s. (full scale), rdg. (reading) and dgt. (digit) values, with the following meanings:

f.s.

rdg.

dgt.

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(maximum display value or scale length) The maximum displayable value or the full length of the scale. This is usually the maximum value of the currently selected range.

(reading or displayed value) The value currently being measured and indicated on the measuring instrument.

(resolution) The smallest displayable unit on a digital measuring instrument, i.e., the input value that causes the digital display to show a "1".

Safety Notes

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Notes on Use

Follow these precautions to ensure safe operation and to obtain the full benefits of the various functions.

DANGER

Probe Connection, Measurement Voltage Input

Maximum input voltage ratings for the input module and the input terminals of the instrument are shown below. To avoid the risk of electric shock and damage to the instrument, take care not to exceed these ratings. The maximum rated voltage to earth of the input module (voltage between input terminals and main instrument frame ground, and between inputs of other analog input modules) is shown below. To avoid the risk of electric shock and damage to the instrument, 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 8950, 8952 or 8953-10, always connect the probe to the secondary side of the circuit breaker, so the breaker can prevent an accident if a short circuit occurs. Connection to the primary side involves the risk of electric shock and damage to the instrument. Before using the instrument, make sure that the insulation on the connection cords is undamaged and that no bare conductors are improperly exposed. Using the products in such conditions could cause an electric shock, so contact your dealer or Hioki representative for replacements. (Model 9197, 9198.)

Input/output terminal Maximum input voltage Maximum rated voltage to earth

8950 (input) 400 V DC max. 370 V AC/DC

8951 (input) 30 V rms or 60 V DC 30 V rms or 60 V DC

8952 (input) 400 V DC max. 370 V AC/DC

8953-10 (input) 400 V DC max. 370 V AC/DC

8954 (input) 30 V rms or 60 V DC 370 V AC/DC

8955 (input) 30 V rms or 60 V DC 30 V rms or 60 V DC

9322

EXT TRIG/ START STOP/ EXT SMPL

TRIG OUT/ GO/ NG/ EXT.OUT

2000 V DC, 1000 V AC (CAT II) 600 V DC/AC (CAT III)

-5 to +10 V DC

-20 V to +30 V DC 500 mA max./ 200 mW max.

When using grabber clips 1500 V DC/AC (CAT II), 600 V DC/AC (CAT III) When using alligator clips 1000 V DC/AC (CAT II), 600 V DC/AC (CAT III)

Not insulated

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Notes on Use

vii

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DANGER

External I/O terminal connections

A common GND is used for the external I/O terminals (START, STOP, GO, NG, EXT_OUT, EXT_TRIG, EXT_OUT, and EXT_SMPL terminals) and the 8855 instrument. The terminals are not isolated. To prevent damage to the object connected to the external I/O terminals and the 8855 instrument, wire the terminals so that there is no difference in electrical potential between the GND for the external I/O terminals and the GND for the connected object.

Logic Probe Connection

The logic input and 8855 instrument share a common ground. Therefore, if power is supplied to the measurement object of the logic probe and to the 8855 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 8855 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 8855 using the supplied power cord.

(2) Before connecting the logic probe to the measurement

object, connect the ground of the measurement object to the 8855 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.

Differential Probe Connection

When using grabber clips, the 9322's maximum rated voltage to earth is 1500 V AC or DC (CAT ll) / 600 V AC or DC (CAT lll); when using alligator clips, it is 1000 V AC or DC (CAT ll) / 600 V AC or DC (CAT lll). To avoid electrical shock and possible damage to the instrument, never apply voltage greater than these limits between the input channel terminals and chassis, or across the input of two 9322s. Maximum input voltage is 1000 V AC/2000 V DC (CAT ll) / 600 V AC or DC (CAT lll). Attempting to measure voltage in excess of the maximum rating could destroy the instrument and result in personal injury or death.

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Notes on Use

viii

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DANGER

WARNING

10:1 and 100:1 probe connections

The maximum rated to-voltage does not change when using a 9665 10:1PROBE or a 9666 100:1PROBE. To avoid electrical shock or damaging the 8855 instrument, make probe connections in such a manner that the method for the probe, and make sure the to-ground voltage does not exceed the rated maximum. The maximum input voltage is 1,000 V DC for the 9665 10:1PROBE, and 5,000 V DC for the 9666 100:1PROBE. (The measurement category (overvoltage category) is the same as that of the input modules of MEMORY HiCORDERs that use the 9665 and the 9666. ) Do not measure voltages that exceed the maximum input voltage, as the 8855 instrument could be damaged and an accidents resulting in injury or death could result.

Power Supply Connections

Before turning the instrument on, make sure the source voltage matches that indicated on the instrument's power connector. Connection to an improper supply voltage may damage the instrument and present an electrical hazard.

Replacing the Input Modules

To avoid electric shock accident, before removing or replacing an input module, confirm that the instrument is turned off and that the connection cords are disconnected. To avoid the danger of electric shock, never operate the instrument with an input module removed. To use the instrument after removing an input module, install a blank panel over the opening of the removed module.

Grounding the Instrument

To avoid electrical accidents and to maintain the safety specifications of this instrument, connect the power cord only to a 3-contact (two-conductor + ground) outlet. Refer to Section 2.2, "Power Supply and Ground Connections."

Before Powering on

Check that the power supply is correct for the rating of the instrument. Be careful to avoid connecting voltage improperly, as the internal circuitry may be destroyed. (The AC fuse is integrated in the instrument.)

Usage Precautions for the Internal MO Drive (option)

To prevent damage to the instrument, do not attempt to disassemble the MO drive.

Laser radiation can be emitted when the MO drive is open. Avoid looking directly into the laser when the MO drive is open. Maximum laser output is 50 mW (at 685 nm, pulsed).

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Notes on Use

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CAUTION

Installation Enviroment

This instrument should be installed and operated indoors only, between 5 and 40 and 30 to 80% RH. Do not store or use the instrument where it could be exposed to direct sunlight, high temperature or humidity, or condensation. Under such conditions, the instrument may be damaged and insulation may deteriorate so that it no longer meets specifications.

Storing (when the 8994 PRINTER UNIT is installed)

When the product is not to be used for an extended period, set the head up/down lever to the "head up" position. This will protect the printer head and prevent deformation of the rubber roller.

Precautions on carrying this equipment

The terminal guard of the equipment protects the inputs. Do not hold this guard when carrying the equipment. To carry this equipment, use the handle. See Section 1.2.

Shipping

Remove the printer paper from the product. If the paper is left in the product, paper support parts may be damaged due to vibrations. (when the 8994 PRINTER UNIT is installed)

To avoid damage to the instrument, be sure to remove the input modules, floppy disk, MO disk, PC card, and SCSI cable before shipping.

Use the original packing materials when reshipping the instrument, if possible.

Handling the CD-R

Always hold the disc by the edges, so as not to make fingerprints on the disc or scratch the printing. To write on the disc label surface, use a spirit-based felt pen. Do not use a ball-point pen or hard-tipped pen, because there is a danger of scratching the surface and corrupting the data. Do not use adhesive labels. Do not expose the disc directly to the sun's rays, or keep it in conditions of high temperature or humidity, as there is a danger of warping, with consequent loss of data. To remove dirt, dust, or fingerprints from the disc, wipe with a dry cloth, or use a CD cleaner. Always wipe radially from the inside to the outside, and do no wipe with circular movements. Never use abrasives or solvent cleaners. Hioki shall not be held liable for any problems with a computer system that arises from the use of this CD-R, or for any problem related to the purchase of a Hioki product.

Others

In the event of problems with operation, first refer to Quick Start Section 14.4, "Troubleshooting".

Carefully read and observe all precautions in this manual.

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Notes on Use

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NOTE

Using a printer

Avoid using the printer in hot, humid environments, as this can greatly reduce printer life.

Using the connection cords

Use only the specified connection cord (9197, 9198). Using a non-specified cord may result in incorrect measurements due to poor connection or other reasons.

Recording paper (when the 8994 PRINTER UNIT is installed)

Use only recording paper specified by Hioki. Non-specified recording paper may result in poor-quality or blank printouts.

Printing is not possible if the recording paper is loaded wrong-side up. See Section 2.9.

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Notes on Use

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Chapter Summary

Chapter 1 Product Overview

Contains an overview of the instrument and its features.

Chapter 2 Installation and Preparation

Explains how to set the instrument up for measurement.

Chapter 3 Recorder and Momory Function

Explains how to use the recorder and memory functions of the instrument.

Chapter 4 FFT Function

Explains how to use the FFT functions of the instrument.

Chapter 5 Input Channel Settings

Explains how to use the input channel of the instrument. This manual describes the advanced functions of the 8855.

Chapter 6 Memory Segmentation Function

Explains how to use the Memory Segmentation Function.

Chapter 7 Operation Function

Explains how to use the Calculating, Waveform Parameter value and Waveform GO/NG Evaluation.

Chapter 8 Search Function

Explains how to search for data.

Chapter 9 Waveform Evaluation Function

Explains how to use the Calculating, Waveform Evaluating value and Waveform GO/NG Evaluation.

Chapter 10 Printout of Measurement Data

Explains how to print out measurement data and how to read printed charts.

Chapter 11 Communication Settings

Explains how to make settings for the LAN interface and PC card interface.

Appendix

Contains information that is necessary for using this instrument, including a description of error messages, a glossary, and an explanation how to increase memory.

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Chapter Summary

xii

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Chapter Summary

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Chapter 1

Product Overview

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1.1 Major Features

(1) Waveform collection performance

Using the 8950 ANALOG UNIT, the 8951 VOLTAGE/CURRENT UNIT, and the 8952 DC/RMS UNIT with the 8855, it is possible to record waveforms at 20 MS/s with a resolution of 12 bits. Furthermore, using the 8953-10 HIGH RESOLUTION UNIT, it is possible to record waveforms at 1 MS/s with a resolution of 16 bits. Using the 8954 VOLTAGE/TEMP UNIT in combination with the 8855, it is possible to record temperature. Using the 8955 F/V UNIT in combination with the 8855, it is possible to measure items such as frequency. Regardless of the input module, it is possible to record waveforms on up to 8 channels, simultaneously.

(2) High-resolution display

The 8855 is equipped with a 10.4-inch (800 x 600 pixels) TFT color LCD, and can display waveforms with great precision. Because both the values and gauge can be displayed simultaneously, it is easy to confirm waveform measurements directly on-screen.

(3) Measurement functions

Memory with a maximum sampling speed of 50 ns (simultaneous recording on all channels). If using the optional printer module, it is possible to output real-time recordings on recording paper.

(4) Storage capacity

The 8855 has a standard storage capacity of 32 M words, expandable to 128 M or 512 Mwords with memory upgrades.

(5) Trigger function

Digital trigger circuit

Trigger types: level trigger, window-in trigger, window-out trigger, period trigger, glitch trigger, event trigger, logic trigger (pattern trigger)

(6) Diverse observation functions

The 8855 can calculate such values as the average, maximum, and absolute values, as well as perform arithmetic calculations. The time and value of the cursor can be calculated for all channels.

(7) Search function

You can set criteria and search through captured waveforms.

(8) GUI display

The GUI-inspired (Graphical User Interface) design, which uses both graphical and textual representation on the function key display, makes the instrument easier to configure and operate.

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1.1 Major Features

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(9) On-line help

On-line help guides the user through operation steps and various functions. Furthermore, you can easily display help using the setting item in the lower part of the screen.

(10) Scaling function

By setting the physical amount and the unit to be used for 1 V input, the measurement result can be converted into any desired scale.

(11) Additional recording function

When enabled, the memory is regarded as printer paper.

(12) Input modules (Option)

The analog inputs are floating, and so each input can be connected to its own independent potentials.

Select input modules suitable for measurements.

(13) Built-in thermal printer (Option)

Thermosensitive recording method using a thermal line head The built-in printer delivers waveform printouts on the spot. The printer can also be used to print screen shots, reduction screen shots and parameter information. Report print can be printed.

(14) External storage means (MO/HD drive option)

Measurements, settings, and images can be recorded on a MO disk or hard disk.

(15) PC card

Measurements, settings, and images can be recorded on a flash ATA card.

PPP connection is possible using a modem card.

(16) SCSI interfaces

If a MO drive is connected to the SCSI interface, the waveform data and/or setup conditions can be stored on a MO disk.

When the 8855 is connected to your PC through an SCSI, you can access the data of the internal 8855 MO disk or hard disk from the PC.

(17) Internal LAN interface (10BASE-T)

You can connect the 8855 to a local area network (LAN) using the 9333 LAN COMMUNICATOR. When performing rapid data exchanges, such as those between the 8855 and a PC, remote operations are possible from the PC.

The 8855 supports FTP.

(18) Dual-language capability

Display language is switchable between Japanese and English.

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1.1 Major Features

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1.2 Identification of Controls and Indicators

10 11 12 15 16 17 18 21 22

13 14 19 20

Front Panel

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1.2 Identification of Controls and Indicators

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F1toF10

HELP

CHAN

key

DISP

key

FILE

key

TRIG

STATUS

TIME/DIV

SYSTEM

COPY

FEED

CURSOR

SAVE

AUTO

VALUE

WAVE

SHUTTLE

JOG

A.B CSR

RANGE

STOP

START

POSITION

Channel select keys

key

ESC

key

knob

key

knob

Serve to select setting items.

Provides on-line help.

Causes the display to show the Channel screen which serves for making input channel settings.

Causes the display to show measurement and analysis results.

Causes the display to show the File screen which serves for reading, storing, etc. the waveform data etc.

Causes the display to show the Trigger screen. Setting the trigger functions.

Causes the display to show the Status screen which serves for setting most measurement parameters.

Serves to set the speed for inputting and storing the input signal. Causes the display to show the System screen. Makes all the settings of

common functions, such as the initial settings and various other settings.

Serves to print out stored waveforms.

Serves to print out a hard copy of the current screen display.

Causes the printer paper to advance for as long as the key is pressed.

These keys serve to move the flashing cursor in the four directions.

Saves the data on the specified media.

Pressing this key activates automatic setting of time axis range and voltage range values of input waveform.

Uses to select the numerical values setting.

Uses to select the the waveform scrolling.

Rotary control knob that serves to change values, move the A/B cursors, and scroll the waveform.

Concentric ring that serves to change values, move the A/B cursors, and to scroll the waveform. The speed of movement is proportional to the rotation angle.

Uses to select the the A/B cursor moving.

Sets the measurement range for the channel.

Stops measurement and analysis. Pressing this key twice stops measurement.

Initiates the measurement and analysis. During measurement, the LED above the key is lit.

Sets the zero position for the channel.

Selects channel.

Exits the Input or Set up screen.

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1.2 Identification of Controls and Indicators

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1819202122

AC power switch

AC connector

Function ground terminal (GND)

External sampling terminal

Trigger terminals

PC card slot

Logic probe connectors

Eject button

External output terminal

NG evaluation output terminal

GO evaluation output terminal

Ground terminal (GND)

External stop terminals

External start terminals

Key lock

SCSI connector

LAN connector

1 2 93 4 5 6 7 8 10 11 12 13 14 15 16 17

Right Side Panel

Switches on or off the AC power supply.

The supplied power cord must be plugged in here.

Connects to the earth.

Allows input of an external sampling signal. (in the Memory function)

Can be used to synchronize multiple instruments, using the EXT TRIG input and TRIG OUT output.

Inserts the PC card.

Input connector for the logic input section, designed for the dedicate logic probes (CH A to D).

Removes the PC card.

Various output signals can be selected, such as the BUSY or error signals.

When NG results from the numerical calculation evaluation and waveform evaluation, a signal is output from this terminal.

When GO results from the numerical calculation evaluation and waveform evaluation, a signal is output from this terminal.

Uses with9to14(except12)terminals.

Stop operation can be controlled.

Start operation can be controlled.

Locks the operation of keys.

An MO drive can be connected.

Can be connected to a network through a LAN.

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1.2 Identification of Controls and Indicators

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FD slot

MO slot

Input module slots

Fastening screw

Analog input connector

Blowing slot

Floppy disk is inserted.

MO disk is inserted.

These slots accept input modules.

Secures the plug-in instrument.

Unbalanced analog input. (on ANALOG UNIT)

Left Side Panel

Upper Panel

Bottom PanelRear Panel

Handle

Ventilation

Serves for transporting the 8855.

slots

Printer

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(when the 8994 PRINTER UNIT is installed)

1.2 Identification of Controls and Indicators

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1.2 Identification of Controls and Indicators

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Chapter 2

Installation and Preparation

2.1 Installation of the Product

Installation orientation

Install the instrument on a flat, level surface.

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2.1 Installation of the Product

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Ambient conditions

Temperature 5 to 40oC, 23 5oC recommended for high-precision

measurements.

Humidity 30 to 80% RH (no condensation); 50 10% RH (no

condensation) recommended for high-precision measurements.

Ventilation Take care not to block the ventilation openings and assure

proper ventilation. When using the instrument in an upright position, take care not to block the openings on both side.

Blowing slot

Avoid the following locations:

Blowing slot

Right side

Blowing slot

Upper side

Left side

Blowing slot

Bottom side

Subject to direct sunlight.

Subject to high levels of dust, steam, or corrosive gases (Avoid using the equipment in an environment containing corrosive gases (e.g., H2S, SO2, NI2,andCI2) or substances that generate harmful gasses (e.g., organic silicones, cyanides, and formalins).

Subject to vibrations.

In the vicinity of equipment generating strong electromagnetic fields.

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2.1 Installation of the Product

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2.2 Power Supply and Ground Connections

2.2.1 Connecting the AC Power Supply

WARNING

Check the following points before connecting the instrument to a power supply. Take care never to exceed the power supply ratings given below, to avoid the risk of electric shock and damage to the instrument.

(1) Power supply matches Rated supply voltage (100 to 240 V

AC: Voltage fluctuations of 10% from the rated supply voltage are taken into account.) and rated supply frequency

(50/60 Hz). (2) The AC power switch of the 8855 is set to OFF. (3) Use only the supplied AC power cord.

When supplying power with an inverter or an uninterruptible power supply (UPS), use a device that complies with the following conditions. To avoid the risk of electric shock and damage to the instrument, do not use devices that have a voltage frequency outside the specified range, or that output square waves.

(1) Voltage: 100 V to 240 V AC (2) Power frequency: 50/60 Hz (3) Sine wave output (Do not use devices that have an

unstable output, even if the output is sinusoidal.)

The 8855 has no protective ground terminal, but is intended to be connected to a ground wire via the grounded three-core power cord supplied. In order to avoid electric shock accidents, be sure to connect the grounded three-core power cord supplied to a power supply socket one of whose terminals is properly grounded.

1. Verify that the AC power switch of the 8855 is set to OFF.

2. Plug the grounded three-core power cord supplied into the AC power connector on the right side of the 8855.

3. Plug the power cord into an AC outlet corresponding to the rating of the 8855.

NOTE

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The fuse is incorporated in power supply. It is not user-replaceable. If a problem is found, contact your nearest dealer.

2.2 Power Supply and Ground Connections

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2.2.2 Functional Grounding of the 8855

When the 8855 is used in noise-prone environments, connect the functional grounding terminal to improve noise characteristics.

Functional grounding terminal

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2.2 Power Supply and Ground Connections

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2.3 Power On/Off

WARNING

Check the following points before the power switch is turned on.

Power supply matches Rated supply voltage (100 to 240 V AC: Voltage fluctuations of 10% from the rated supply voltage are taken into account.) and rated supply frequency (50/60 Hz).

The instrument is correctly installed (Section 2.1).

Power cord is correctly connected (Section 2.2).

The instrument is properly grounded.

NOTE

After the power switch is turned on, wait approximately 30 min to stabilize the inside temperature of the connected input module in order to obtain accurate waveforms. Then, make a zero adjustment prior to measurement. For details, see the specifications of each module, Quick Start Section 13.2 "Analog Inputs." Adjustment See Quick Start Section 6.4 "Zero Adjustment."

When the instrument is turned off, it memorizes the currently used settings and reestablishes the same settings the next time the instrument is turned on again.

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2.3 Power On/Off

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2.4 Connection of the Input Product

2.4.1 8950, 8952, 8953-10, 8955 INPUT UNITs

WARNING

CAUTION

NOTE

Never connect the probe to the 8855 while the probe is already connected to the measurement object. Otherwise there is a risk of electric shock. Use only the specified input cord with this probe. An insulating BNC connector is provided to prevent electric shock. When using a metal BNC, there is risk of electric shock, due to the input L terminal having the same potential as the metal portion of the BNC connector.

When disconnecting the BNC connector, be sure to release the lock before pulling off the connector. Forcibly pulling the connector without releasing the lock, or pulling on the cord, can damage the connector. Use the power terminal with the 9322 DIFFERENTIAL PROBE only. To connect the probe, you need the 9328 POWER CORD. To avoid injuries or damage to this instrument, do not connect any device other than the 9322 to the terminal.

Use of an unspecified input cord may result in inaccurate measurements due to poor connection or BNC connector damage.

Connection Cord

(Maximum input voltage:)

Measurement objects

For safety reasons, only use the optional 9197, 9198, or 9217 CONNECTION CORD for connection to the analog input modules.

9197

(500 V)

Items that can be hooked to with large alligator clips

Items that can be hooked to with small alligator clips

9198 (300 V)

9217 (300 V)

BNC output

Connecting to the main instrument

1. Align the BNC connector with the guide groove

Groove of the BNC

of the module input connector, and turn clockwise while pressing in to lock the connector. (Only use the 9198 CONNECTION CORD for connection to the 8955 F/V UNIT.)

2. To remove from the module, turn the BNC

Connectorguide

connector counterclockwise to release the lock, then pull it.

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2.4 Connection of the Input Product

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2.4.2 8951 VOLTAGE/CURRENT UNIT

DANGER

Precautions when using the 3273, 3273-50, and the 3276 CLAMP ON PROBE

When conductors being measured carry in excess of the safe voltage level (SELV-E)* and not more than 300 V, to prevent short circuits and electric shock while the core section is open, make sure that conductors to be measured are insulated with material conforming to (1) Measurement Category (Overvoltage Category), (2) Double (reinforced) Insulation Requirements for Working Voltages of 300 V, and (3) Pollution Degree 2. For safeties sake, never use this sensor on bare conductors. The core and shield case are not insulated. Be careful to avoid damaging the insulation surface while taking measurements. Refer to the following standards regarding the meanings of underlined terms. IEC 61010-1 (JIS C 1010-1) IEC 61010-2-031 (JIS C 1010-2-31)

IEC 61010-2-032 (JIS C 1010-2-32) Precautions when using the 3274 and the 3275 CLAMP ON PROBE

When conductors being measured carry in excess of the

safe voltage level (SELV-E)* and not more than 600 V (CAT II)

or 300 V (CAT III), to prevent short circuits and electric shock

while the core section is open, make sure that the conductor

insulation satisfies the (1) Basic insulation requirements for

the applicable (2) Measurement Category (Overvoltage

Category, (3) Working Voltage, and (4) Pollution Degree. For

safeties sake, never use this sensor on bare conductors.

Be careful to avoid damaging the insulation surface while

taking measurements.

Refer to the following standards regarding the meanings of

underlined terms.

IEC 61010-1 (JIS C 1010-1)

IEC 61010-2-031 (JIS C 1010-2-31)

IEC 61010-2-032 (JIS C 1010-2-32)

*: The voltage levels are 30 V rms and 42.4 V peak or 60 V DC.

WARNING

When you are using the clamp to the 8855, the 8951 GND,

clamp GND, and power supply terminals of modules on other

channels are not insulated. Exercise care in handling these

to avoid damaging this instrument or suffering from injury.

To avoid shock and short circuits, turn off all power before

connecting probes.

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2.4 Connection of the Input Product

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CAUTION

Connecting the Connection cord (for voltage measurement)

1. Align the BNC connector with the guide groove of

Groove of the BNC

Connectorguide

the 8855 input connector, and turn clockwise while pressing in to lock the connector. (For using the 8951, use the 9198 CONNECTION CORD.)

2. To remove from the module, turn the BNC connector counterclockwise to release the lock, then pull it.

Connecting the Clamp (for current measurement)

The following clamp-on sensors and clamp-on probes can be connected using the 9318 CONVERSION CABLEs.

Conversion cable Clamp-on sensor/probe

9318 9270, 9271, 9272, 9277, 9278, 9279

Number of usable clamps

The number of clamps that can be used with the 8855 is limited according to clamp type. The clamps that can be used for the relevant clamp type is shown to the list shown below. In the case that the relevant clamp type is used the clamp total use number is confirmed and please do not exceed the number of the list shown below.

Clamp Number

3274 CLAMP ON PROBE

Continuous 150 A

Non-continuous 300 A

3273-50, 3275, 3276 CLAMP ON PROBE 4

9278 UNIVERSAL CLAMP ON CT 7

9279 UNIVERSAL CLAMP ON CT 7

8 4

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2.4 Connection of the Input Product

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Instrument's sensor connector

Conversion cable plug

Conversion cable connector

Adapted clamp's

Projection on the instrument connecto

Groove on the 3273 CLAMP ON PROBE's termination connector

Sensor connector on the instrument

Conversion cable plug

plug

Connecting the 9318 CONVERSION CABLE

1. Align the groove on the conversion cable plug with

the sensor connector on the 8951 and push inward until the connector locks into place.

2. Align the groove on the conversion cable connector

with the adapted clamp on sensor plug and push inward until the connector locks into place.

3. To unplug the cables, slide the lock ring on each

plug outward to unlock it, then pull out the plug.

Connecting the 3273, 3273-50, 3274, 3275, 3276 CLAMP ON PROBE

1. Align the groove on the 3273, 3273-50, 3274,

3275, 3276 CLAMP ON PROBE's termination connector with the pin on the BNC connector on the 8951, then slide the termination connector over the BNC connector and turn to lock it in place.

2. Align the groove on the 3273, 3273-50, 3274,

3275, 3276 cable plug with the power connector on the 8951.

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2.4 Connection of the Input Product

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2.4.3 8954 VOLTAGE/TEMP UNIT

WARNING

CAUTION

Do not connect the connection cord to the 8855 while the instrument is connected to the object being measured. This may cause electric shock. A common GND is used for the voltage and temperature input on each channel. When using the voltage and temperature inputs simultaneously, do not connect them both at the same time as this may damage the object you are measuring. When using a non-insulated thermocouple to measure the temperature of points, be careful not to touch the terminals. The terminals may be electrically charged.

When disconnecting the BNC connector, be sure to release the lock before pulling off the connector. Forcibly pulling the connector without releasing the lock, or pulling on the cord, can damage the connector. Make sure that the thermocouple is installed in a location within the safe super-low voltage (30 V rms or 60 V DC ). For information on selecting a thermocouple when measuring high voltage components, contact the thermocouple manufacturer.

NOTE

The voltage and temperature inputs and this instrument are isolated.

Connecting the connection cord(whenmeasuringvoltage)

1. Align the groove on the BNC connector with the connector guide on the module and insert the BNC connector, then turn it to the right to lock it in place. (Use the 9198 CONNECTION CORD when measuring voltage with the 8954.)

2. To remove the BNC connector, turn it to the left to release the lock, then pull it out.

Connecting the thermocouple (when measuring temperature)

1. First, remove the covering from the thermocouple.

2. Press the button with a tool, such as a screwdriver.

3. With the button pressed down, insert the thermocouple into the connection

slot.

4. When you release the button, the thermocouple is fixed in place.

5. To remove the thermocouple, hold down the button and pull out the

thermocouple.

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2.4 Connection of the Input Product

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How to remove the covering from the thermocouple

25 mm

10 mm

External covering

Internal covering Thermocouple wire

Recommended diameter

0.4 mm to 1.2 mm

(AWG26 to 16)

NOTE

To install and remove the thermocouple, use a tool such as a screwdriver.

The push-button terminal block on the 8954 VOLTAGE/TEMP UNIT is for use with a thermocouple. Only connect the thermocouples specified (types K, J, E, T, N, R, S, B, and W).

If you reverse the + and connections on the thermocouple, the correct value will not be displayed.

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2.4 Connection of the Input Product

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2.5 Logic Probe Connection

DANGER

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 8855 could be damaged. We therefore recommend the following connection method to avoid this kind of result.

(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 8855 using the supplied power cord.

(2) Before connecting the logic probe to the measurement object,

connect the ground of the measurement object to the 8855 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.

Object to be measured

8855

Object to be measured

8855

NOTE

GND

Functionground terminal

In this case too, obtain power from the same supply.

Power suppl

Figure 2

Outlet

Figure 1

Ground

The logic input is located on the rear of the instrument. Up to four probes can be connected.

Since one logic probe can record 4 channels, the combined maximum recording capability for logic waveforms is 16 channels.

Connect the probe by aligning the groove on the plug with the ridge on the connector.

If no logic probe is connected, the corresponding logic waveform is displayed on the screen at high level.

Carefully read the instruction manual supplied with the probe.

Do not connect logic probes other than supplied by HIOKI to the logic inputs.

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2.5 Logic Probe Connection

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2.6 9018-10, 9132-10 CLAMP ON PROBE Connection

DANGER

Clamp-on probe should only be connected to the secondary side of a breaker, so the breaker can prevent an accident if a short circuit occurs. Connections should never be made to the primary side of a breaker, because unrestricted current flow could cause a serious accident if a short circuit occurs.

Before using the 9018-10, 9132-10 CLAMP ON PROBE, be certain that you understand the instructions and precautions in the manual

This instrument measures input voltage, so although current can not be measured directly, current can be measured by the voltage output from the HIOKI 9810-10, 9132-10 CLAMP ON PROBEs.

Connect the BNC connector of the CLAMP ON PROBE to the analog input terminal. For details, refer to "Connecting the Connection cord (for voltage measurement)" of 2.4.2.

NOTE

9018-10

9132-10

The 8855 will indicate measurement results as voltage.

Using the scaling function, units can be converted to "A" for display. See Section 5.3.2.

When the clamp-on probe is used for measurement, the measurement precision will be affected both by the 8855 precision and clamp-on probe precision ratings. The same is true for cases where other clamps are used.

When using the 9199 CONVERSION ADAPTOR, the 9018, 9132 CLAMP ON PROBEs can be used.

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2.6 9018-10, 9132-10 CLAMP ON PROBE Connection

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2.7 9322 DIFFERENTIAL PROBE Connection

DANGER

Grabber clips

Alligator clips

H-L 2,000 V DC, 1,000 V AC (CAT II) 600 V AC, DC (CAT III)

H-GND 1,500 V AC, DC (CAT II) 600 V AC, DC (CAT III)

L-GND 1,500 V AC, DC (CAT II) 600 V AC, DC (CAT III)

H-L 2,000 V DC, 1,000 V AC (CAT II) 600 V AC, DC (CAT III)

H-GND 1,000 V AC, DC (CAT II) 600 V AC, DC (CAT III)

L-GND 1,000 V AC, DC (CAT II) 600 V AC, DC (CAT III)

9322 is a differential probe that connects to input of 8855 MEMORY HiCORDER input module. For more details, refer to its instruction manual.

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2.7 9322 DIFFERENTIAL PROBE Connection

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2.8 9665 10:1 PROBE / 9666 100:1 PROBE

DANGER

NOTE

10:1 and 100:1 probe connections

The maximum input voltage is 1,000 Vrms (1MHz max) for the 9665 10:1PROBE, and 5,000 Vpeak (1MHz max) for the 9666 100:1PROBE. (The measurement category (overvoltage category) is the same as that of the input modules of MEMORY HiCORDERs that use the 9665 and the 9666. ) Do not measure voltages that exceed the maximum input voltage, as the 8855 instrument could be damaged and an accidents resulting in injury or death could result.

The 9665 10:1PROBE and the 9666 100:1PROBE cannot be used with the

8951 VOLTAGE/CURRENT UNIT, the 8954 VOLTAGE/TEMP UNIT, or the 8955 F/V UNIT.

For details on the 9665 10:1PROBE and the 9666 100:1PROBE, refer to the

instruction manuals supplied with the respective probes.

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2.8 9665 10:1 PROBE / 9666 100:1 PROBE

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2.9 Loading Recording Paper (when the 8994 PRINTER UNIT is installed)

1. Press the stock cover and open it.

Stock cover

Head up/down lever

2. Put down the head up/down lever.

Holder

Printer roller

Attachment

Back side of paper

3. Insert the attachments into the ends of the roll of recording paper and set the paper into its holder.

4. Insert the leading edge of the recording paper from above into the gap behind the printer roller, and pull it out to the other side.

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2.9 Loading Recording Paper (when the 8994 PRINTER UNIT is installed)

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5. Align the edges of the recording paper you pulled out of the printer with the edges of the recording paper set into the holder. If the edges of the recording paper are not aligned exactly, the paper will come out crooked when printing.

6. Raise the head up/down lever.

7. Pull the recording paper to the outside through the printer exit slot in the stock cover.

CAUTION

8. Close the stock cover, and finish by tearing off the recording paper against the edge of the printer exit slot.

Always place the product in the head-up condition when it is to be transported or stored for an extended period of time. If the product is left idle for a long time with the head pressing on the roller, the roller may be deformed, resulting in uneven printing.

NOTE

Make sure that the paper may jam if it is not aligned with the roller.

Printing is not possible if the recording paper is loaded wrong-side up.

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2.9 Loading Recording Paper (when the 8994 PRINTER UNIT is installed)

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2.10 Care of Recording Paper

Care of recording paper

While unopened, thermal paper will not be affected by the environment, provided that ambient temperature and humidity do not exceed normal levels. For long-term storage, temperature should be lower than 40 .Low temperatures cause no problem.

After opening, protect the paper from strong light, to prevent discoloration.

Storing data recordings

As the recording paper is thermally sensitive, be aware of the following points:

To avoid paper discoloration, do not expose it to direct sunlight.

Store at no more than 40 and 90% RH.

For permanent storage of important recorded data, photocopy the recording paper.

Thermal paper will blacken when brought into contact with alcohol, ester, ketone, or other volatile organic substances.

If the thermal paper absorbs an organic solvent such as alcohols or ketones it may no longer develop properly, and recorded information may fade. Soft PVC film and transparent contact adhesive tape contain such solvents, so avoid using them with recordings.

The thermal recording paper is ruined by contact with wet Daizo copy paper.

Direct sunlight Organic solvent

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2.10 Care of Recording Paper

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2.11 Notes on Measurement

DANGER

The maximum rated voltage to earth of the input module (voltage between input terminals and main instrument frame ground, and between inputs of other analog input modules) is shown below. To avoid the risk of electric shock and damage to the instrument, 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 8950, 8952 or 8953-10, 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 instrument.

Before using the instrument, make sure that the insulation on the connection cords is undamaged and that no bare conductors are improperly exposed. Using the products in such conditions could cause an electric shock, so contact your dealer or Hioki representative for replacements. (Model 9197 or 9198 CONNECTION CORD.)

Input/output terminal Maximum input voltage Maximum rated voltage to earth

8950 (input) 400 V DC max. 370 V AC/DC

8951 (input) 30 V rms or 60 V DC 30 V rms or 60 V DC

8952 (input) 400 V DC max. 370 V AC/DC

8953-10 (input) 400 V DC max. 370 V AC/DC

8954 (input) 30 V rms or 60 V DC 370 V AC/DC

8955 (input) 30 V rms or 60 V DC 30 V rms or 60 V DC

9322

EXT TRIG/ START STOP/ EXT SMPL

TRIG OUT/ GO/ NG/ EXT.OUT

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2000 V DC, 1000 V AC (CAT II) 600 V DC/AC (CAT III)

-5 to +10 V DC

-20 V to +30 V DC 500 mA max./ 200 mW max.

When using grabber clips 1500 V DC/AC (CAT II), 600 V DC/AC (CAT III) When using alligator clips 1000 V DC/AC (CAT II), 600 V DC/AC (CAT III)

Not insulated

2.11 Notes on Measurement

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WARNING

CAUTION

In order to avoid accidents from electric shock, before removing or replacing an input module, check that the connection cords and thermocouple are disconnected, turn off the power, and remove the power cord.

To avoid the danger of electric shock, never operate the instrument with an input module removed. To use the instrument after removing an input module, install a blank panel over the opening of the removed module.

When making measurements on an AC power line for example, using a voltage transformer, be sure to connect the voltage transformer ground terminal to ground.

Difference between "370 V AC, DC" and "400 V DC max." indication

370 V AC, DC: RMS value is displayed. 400 V DC max.: Instantaneous value is displayed.

The maximum input voltage (400 V DC max.) is defined as the superposition of DC component and AC peak, as shown in the figure below.

AC DC DC+AC

+400 V DC

-400 V DC

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2.11 Notes on Measurement

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2.11.1 Maximum Input Voltage

8950 ANALOG UNIT/ 8952 DC/RMS UNIT 8953-10 HIGH RESOLUTION UNIT

8855

GND

8950 8953-10

8951 VOLTAGE/CURRENT UNIT

8855

GND

8951

Connector

BNC

8954 VOLTAGE/TEMP UNIT

8855

GND

8954

400 V DC max.

370 V AC, DC

30 V rms or 60 V DC

370 V AC, DC

30 V rms or 60 V DC

370 V AC, DC

8955 F/V UNIT

8855

GND

8955

30 V rms or 60 V DC

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2.11 Notes on Measurement

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2.11.2 Using a Voltage Transformer

When making measurements on an AC power line for example, using a voltage transformer, be sure to connect the voltage transformer ground terminal to ground.

When the voltage transformer has a ground terminal

8855

GND

8950

H L

Input

Voltage transformer (PT) ground terminal

Ground

When the voltage transformer has no ground terminal

8855

GND

8950

H L

Ground

Input

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2.11 Notes on Measurement

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Chapter 3

Recorder & Memory Function

3.1 Overview of the Recorder & Memory Function

The recorder and memory function has the following features.

(1) After being stored in the internal memory, input signal data can be displayed

and printed.

(2) All input channel data are recorded on the same time axis.

Since data for all channels can be superimposed, the relative relationship between input signals can be observed visually.

(3) Simultaneous Display of Recorder and Memory Waveforms

(4) Time axis setting

10 ms/DIV to 1 h/DIV (recorder, 17 steps) 10 µs/DIV to 5 min/DIV (memory, 20 steps)

(5) Time axis resolution 100 points/DIV

(6) Storage capacity

32 M words (DIV) 10000 (Recorder) 20000 (Memory) 128 M words (DIV) 40000 (Recorder) 80000 (Memory) 512 M words (DIV) 160000 (Recorder) 320000 (Memory) Desired setting: in addition to the above recording lengths, 1-division steps up to the highest division are possible

(7) Display format

Single, dual, quad, oct screen display

(8) Printing

Real-time print (recorder only), manual print, partial print, report print, screen hard copy can be printed.

(9) High-quality print

Smooth print function approximates analog waveform.

(10) Additional recording function

The first set of measurement data is preserved, and recording of the second set of measurement data starts after the first set.

(11) Logging function

Numeric printout of waveform data

────────────────────────────────────────────────────

3.1 Overview of the Recorder & Memory Function

────────────────────────────────────────────────────

3.2 Operation Sequence (REC&MEM)

Preparation

See Chapter 2

Basic Settings

Settings on the STATUS screen

See Section 3.3

Press the the STATUS screen.

STATUS

key to display

Installation of the Instrument

Turn on the power

Connect the inputs

Function

Select the recorder and memory function.

Time axis range (Recorder/Memory waveform setting)

Recording length

Determine the speed with which the input signal waveform is captured.

Determine the length of the data sample for a single measurement.

Display function

Select the waveform data (recorder/memory) on the waveform display screen.

Display format

Select the format type for the waveform display screen.

Additional recording

Set whether additional recording is required.

Setting the printer

See Section 3.6

Saving the file

See

Section 3.7

Advanced Settings

(Use this function, if necessary.)

Settings on the STATUS2 screen

Setting the print mode

Select the format, waveform, or numerical value should be used to output measured data and calculation results.

Setting the print mode

Select whether or not to print out the waveform automatically after it is captured.

Auto save function Select whether or not to save the

waveform automatically after it is captured.

Memory segmentation

See Chapter 6

────────────────────────────────────────────────────

3.2 Operation Sequence (REC&MEM)

────────────────────────────────────────────────────

Setting the input channel

Settings on the channel screen

Settings the advanced function

Setting the trigger function

See Quick Start Chapter 7

See Quick Start Chapter 6

Waveform display color Waveform display graph Voltage axis range Input coupling

Logic input Magnification/compression along voltage Zero position

Zero adjustment Low-pass filter Variable function (See Section 5.2)

Scaling function (See Section 5.3) Comment function (See Section 5.4) Vernier function (See Section 5.6.3)

Trigger mode Trigger source Pre-trigger Trigger selection

Start measurement

Press the When the trigger conditions are met, measurement start. Press the

Processing measurement data

Measurements on display screen

Stop measurement

Setting the system

Press the SYSTEM screen. (See Quick Start Chapter

SYSTEM

key to display the

START

STOP

key and the LED lights.

key and the LED goes out after measurement has finished.

Printing the measurement data (See Chapter 10) Saving the measurement data (See Quick Start Chapter 10)

Waveform scrolling (See Quick Start Section 8.1) Using the A B cursor (See Quick Start Section 8.2) Magnification/compression ratio along time axis

(See Quick Start Section 8.3)

Set up (See Quick Start Section 9.2) File (See Quick Start Section 9.3) Printer (See Quick Start Section 9.4) Interface (See Chapter 11) Initialize (See Quick Start Section 9.5) Self-check (See Quick Start Section 9.6)

────────────────────────────────────────────────────

3.2 Operation Sequence (REC&MEM)

────────────────────────────────────────────────────

3.3 STATUS Settings (REC&MEM: STATUS Screen)

Press the

STATUS

key to access the STATUS screen. This section explains how to set the STATUS screen of the recorder and memory function. See the corresponding sections for items that can be set in the Waveform display or CHANNEL screens. Waveform display screen: See Section 3.5 CHANNEL screen: See Quick Start Section 6.3

See Sections

3.3.1

3.3.2

3.3.3

3.3.5

3.3.4

NOTE

────────────────────────────────────────────────────

3.3 STATUS Settings (REC&MEM: STATUS Screen)

The settings of memory segmentation function, see Chapter 6.

────────────────────────────────────────────────────

3.3.1 Setting the Function Mode

The 8855 has four function modes. Select the Recorder and Memory functions.

Procedure Screen: STATUS, CHANNEL, Waveform display, TRIGGER, SYSTEM

1. Use the Menu keys to display the desired screen.

2. Move the flashing cursor to the top position.

3. Select the

REC&MEM

function key display.

Function

display

Recorder & Memory Function Operation

During real-time signal recording with the recorder function, if an abnormal phenomena latches the trigger, that period is recorded simultaneously by the high-speed sampling memory recorder. Normal recorder operation is not suspended during memory recording, so the real-time recording continues through the abnormal phenomena.

Low-speed Recorder recording

Meaning

Memory recorder function

Recorder function

Recorder & Memory function

FFT function

High-speed Memory recording

────────────────────────────────────────────────────

3.3 STATUS Settings (REC&MEM: STATUS Screen)

────────────────────────────────────────────────────

3.3.2 Setting the Time Axis Range

Set the speed for inputting and storing the waveform of the input signal. Time axis range setting expresses the time for 1 DIV. The sampling period is 1/100th of the set value for the time axis range. (100 samples/DIV) The sampling period for the sampling recorder is set by the memory.

Procedure 1 1. Use the Menu keys to display the desired screen.

Screen: Waveform display Procedure 2 1. Press the

NOTE

Screen: STATUS

2. Move the flashing cursor to the

Time/Div

item.

3. Move the flashing cursor to the time axis range for recorder or memory to make the selection by using the Jog/Shuttle control, the function keys. For the time axis range setting for the recorder, the

TIME/DIV

knob can be

also used.

key to display the Waveform display screen.

DISP

2. Move the flashing cursor to waveform) or

rec&MEM

3. Move the flashing cursor to the

Function change

(memory waveform) by using theF4function key.

time axis range

4. Use the Jog/Shuttle control, the function keys, or setting. The

TIME/DIV

knob can be used regardless of where the flashing

and select

item.

TIME/DIV

REC&mem

(recorder

knob to make the

cursor is located.

The sampling period of the recorder is the same as that set for memory, so depending on the memory sampling period, the time axis may not be settable for the recorder.

When the time axis range for recorder is set to the fast range (greater than 200 ms/division), the real-time print setting is automatically off.

10 µs 20 µs

50 µs 100 µs 200 µs 500 µs

1ms 2ms

5ms 10 ms 20 ms 50 ms

100 ms 200 ms 500 ms

1s 2s

5s 10 s 30 s

1min 2min 5min

Combination of the recorder and memory time axis range.

Vertical axis: time axis range of memory waveform (/DIV), horizontal axis: time axis range of recorder waveform (/DIV)

10 ms 20 ms 50 ms 100 ms200 ms500 ms 1 s 2 s 5 s 10 s 30 s 1 min 2 min 5min10 min 30 min 1 hour

zzzzzzzzzzzzzz zzz

- zzzzzzzzzzzz

- -

- - -

- - - -

- - - - -

- - - - - -

- - - - - - -

- - - - - - - -

- - - - - - - - - zz

- - - - - - - - - - z

- - - - - - - - - - -

- - - - - - - - - - - - z

- - - - - - - - - - - - -

- - - - - - - - - - - - - -

- - - - - - - - - - - - - - - zz

z z z z z z z z z z z z zzz

z z z z z z z z z z z zzz

z z z z z z z z z z zzz

z z z z z z z z z zzz

z z z z z z z z zzz

z z z z z z z zzz

z z z z z z zzz

z z z zzz

z zzz

zzz

────────────────────────────────────────────────────

3.3 STATUS Settings (REC&MEM: STATUS Screen)

────────────────────────────────────────────────────

3.3.3 Setting the Recording Length

The length of recording for one measurement operation (number of DIV) can be set. The recording lengths for the recorder and memory are set separately. Two setting methods are available.

SELECT ARBITRARY Variable recording length can be selected by the user.

Screen: STATUS, Waveform display

Procedure 1 Constant recording length mode

1. Use the Menu keys to display the desired screen.

2. Move the flashing cursor to the

3. To set the recording length, move the flashing cursor to either Recorder or Memory, according to which is to be set, and select

4. Use the Jog control or the function keys to make a setting.

Select the recording length.

Function

display

Meaning

Shot

item.

SELECT

Move the cursor up in the selection window.

Move the cursor down in the selection window.

Setting the recording length to continuous

format.

Procedure 2 Variable recording length mode

1. Use the Menu keys to display the desired screen. Move the flashing cursor to the

Shot

item.

2. To set the recording length, move the flashing cursor to either Recorder or Memory, according to which is to be set, and select

3. Use the Jog/Shuttle control or the function keys to make a setting.

Function

display

Meaning

Increases in number. (+50)

Increases in number. (+1)

Decreases in number. (-1)

Decreases in number. (-50)

ARBITRARY

NOTE

If the recording length is changed during measurement, measurement is

restarted using the newly set recording length.

The memory capacity of 32 M words can accommodate up to 10000

divisions (recorder) or 20000 divisions (memory) of waveform data. With 128 M words, waveform data of up to 40000 divisions (recorder) or 80000 divisions (memory) can be saved. With 512 M words, waveform data of up to 160000 divisions (recorder) or 320000 divisions (memory) can be saved.

────────────────────────────────────────────────────

3.3 STATUS Settings (REC&MEM: STATUS Screen)

────────────────────────────────────────────────────

3.3.4 Display Function

The type of display waveform can be selected.

Procedure

1. Press the

2. Move the flashing cursor to the

3. Use the function keys to make a setting.

NOTE

Screen: STATUS

STATUS

Function

display

The type of display waveform can be set by pressing the

key to display the STATUS screen.

Function

Meaning

Memory waveform is displayed

Recorder waveform is displayed

Displays both the memory (MEM) waveform and recorder (REC) waveform

item.

REC&MEM

function key on the Waveform display screen. The memory waveform in Recorder and Memory function can be also displayed in memory recorder function. The display function setting cannot be changed during measurement. Starting up the 8855 with memory waveform display ON automatically selects REC&MEM display.

────────────────────────────────────────────────────

3.3 STATUS Settings (REC&MEM: STATUS Screen)

────────────────────────────────────────────────────

3.3.5 Setting the Display Format

The style can be set for showing input signals on the screen display and recording them on the printer.

The styles single, dual, quad, and oct are available.

Procedure Screen: STATUS

Flashing cursor

1. Press the

STATUS

screen.

2. Move the flashing cursor to the

key to display the Status

Format

item, as

shown in the figure on the left.

3. Use the function keys to select the display format.

Function

display

Meaning

Display and record the waveform in one graph.

Display and record the waveform in two graphs.

Display and record the waveform in four

graphs.

Display and record the waveform in oct graphs.

On the channel screen, set the graph position of the display screen or waveform to be printed. This setting is valid when [Display format setting] on the status screen is set to a format other than single screen.

Flashing cursor

NOTE

Procedure Screen: ONE CH, LIST (CHANNEL)

1. Press the

CHAN

key to display the Channel

screen.

2. Move the flashing cursor to the position of the

Graph

3. Use the function keys or

to be set.

control to make

JOG

the selection.

Function

display

Meaning

Increases in number

Decreases in number

Setting the display function to memory waveform and recorder waveform invalidates the display format setting.

────────────────────────────────────────────────────

3.3 STATUS Settings (REC&MEM: STATUS Screen)

)

────────────────────────────────────────────────────

3.4 Setting the Additional Recording Function

This records, regarding the memory as though it were recording paper. As waveforms captured by the recorder are stored in the instrument's memory, this machine can be operated as a paper recorder.

The memory capacity of 32 M words can accommodate up to 10000 divisions of waveform data. With 128 M words (after optional memory expansion), waveform data of up to 40000 divisions can be saved. With 512 M words (after optional memory expansion), waveform data of up to 160000 divisions can be saved. The waveform can be scrolled and printed out. Switching the additional recording on and off affects the use of memory as shown below. (When the recording length is set to 30 divisions)

Additional recording: OFF

Additional recording: ON

Initial recording

Records 30 divisions of data

10000 DIV(No memoryexpansion

30 DIV

Second recording Records a further 30 divisions of data Initial measurements are erased, and new data is recorded from the beginning of the memory.

30 DIV

Initial recording

Records 30 divisions of data

10000 DIV(No memoryexpansion

30 DIV

Second recording New data is recorded from the end of existing data without erasing the previou measurements.

30 DIV

The first and second sets of waveforms can be observed by scrolling or printing the waveform.

Procedure Screen: STATUS

1. Press the

STATUS

2. Move the flashing cursor to the

key to display the STATUS screen.

Record Add

item.

3. Use the function keys to make a setting.

Function

display

────────────────────────────────────────────────────

3.4 Setting the Additional Recording Function

Meaning

Additional recording is disabled.

Additional recording is enabled.

────────────────────────────────────────────────────

NOTE

Time values output to the printer and displayed on the screen with the additional recording function enabled are equal to those of the most recently acquired waveforms. Therefore, when measuring waveforms in a different time axis range, always take that difference into consideration.

When the 10000 (128 M words: 40000, 512 M words: 160000) DIV has been reached, old data will be overwritten.

In the recorder, the trigger mark ( ) is written as the start position mark. In

an additional recording, the trigger mark is displayed in front of the most recently entered data.

If auto-save is enabled, only newly acquired waveforms are saved. Even

when A and B cursors appear on the screen, no partial save is performed, because the setting is disabled when the

START

key is pressed.

A one-line data appears between the two measurements to delimit them.

(The line of data is vertical.)

When using the 8953-10 HIGH RESOLUTION UNIT, 8954 VOLTAGE/TEMP UNIT, or 8955 F/V UNIT, and its additional recording function is active, if logic input is activated during measurement, a logic waveform is displayed, but the data is invalid. When measurement is made with additional recording ON, the screen shows the logic waveform obtained before additional recording was turned on, but the data is invalid. If logic input is active, the analog data corresponding to that logic channel becomes 12-bit data. For details,

see Quick Start Section 6.3.10.

3.5 Settings on the Waveform Display Screen (REC&MEM)

Explains the setting items on the Waveform display screen. For details on setting, When want to use the Jog/Shuttle control, press the selection window is not displayed.) Pressing the F4 function key "REC&MEM" on the Waveform display screen toggles screen between memory waveform and recorder waveform.

REC&mem

rec&MEM

REC&MEM

Recorder waveform display in Recorder and Memory function

Memory waveform display in Recorder and Memory function

Displays both the recorder waveform and memory waveform

refer to Section 3.3

VALUE

select key. (The

────────────────────────────────────────────────────

3.5 Settings on the Waveform Display Screen (REC&MEM)

────────────────────────────────────────────────────

1 4

Setting items Selection Explanation

1. Function

2. Trigger mode

(recorder waveform)

3. Pre-trigger (memory waveform)

Time Axis Range

MEM, REC, FFT, REC&MEM

SINGLE, REPEAT, TIMER

0to100%,-95%

10 ms/DIV to 1h/DIV(REC) 10 µs/DIV to 5 min/DIV (MEM)

6 5

Select function.

Select trigger mode.

Set the Pre-trigger.

Set the speed for inputting and storing the waveform of the input signal. Time axis range setting expresses the time for 1 DIV.

5. Magnification

/compression along the time axis

x 1 to x 1/500 (REC) x 10 to x 1/10000 (MEM)

By magnifying the waveform, detailed observations can be made. By compressing the waveform, an entire change can be promptly apprehended.

6. Recording Length

Input channel settings

SELECT: 30 DIV to continuous (REC) 30 DIV to 20000 DIV (MEM) ARBITRARY: 1 DIV to 10000 DIV (REC) 1 DIV to 20000 DIV (MEM)

Analog input Logic input

Using channels: 8 ch Capacity: 32 M words The length of recording for one measurement operation (the number of DIV) can be set.

Press the

F9 (CH.SET)

Waveform display screen to make settings for the input channel on the display. For details, see section

5.6.

Trigger settings

Analog trigger

Press the

F9 (CH.SET)

Memory waveform display screen to make trigger settings on the display. For details, refer to Quick Start chapter 7.

Level monitor function

VIEW function

Press the

MONITOR)

the Waveform display screen.

Press the key on the Waveform display screen.

F8 (LEVEL

key on

F7 (VIEW)

Refer to Quick Start Section 8.5.

Refer to Section 8.1.

key on the

────────────────────────────────────────────────────

3.5 Settings on the Waveform Display Screen (REC&MEM)

────────────────────────────────────────────────────

3.6 Setting The Printer (Only When The 8994 PRINTER UNIT Is Installed)

3.6.1 Setting the Print Mode

Select the format, waveform, or numerical value should be used to output measured data and calculation results.

Waveform The smooth print function can be used, but print speed will

decrease.

Logging

The data spacing interval also must be set.

Procedure

(1) Setting the printer format

1. Press the

2. Move the flashing cursor to the

3. Use the function keys to make a setting.

(2) Setting the smooth printing and print interval

1. When the waveform format is selected, determine whether to use the smooth

2. Move the flashing cursor to the

3. Use the function keys to make a setting.

Screen: PRINTER

SYSTEM

Function

display

key to display the PRINTER screen.

Print Mode

Meaning

Measurement data and the result of calculation are printed as a waveform.

Measurement data and the result of calculation are printed as numeric data.

item.

printing or not. When the numerical value is selected, set the print interval. (unit: divisions)

smooth print

item or

interval

Since 1 division represents 100 samples, the print interval "0.01" refers to a printout of every sample (no print interval). If the set print interval exceeds recording length, only the first point is printed.

NOTE

────────────────────────────────────────────────────

Smooth printing is available for memory waveform.

3.6 Setting The Printer (Only When The 8994 PRINTER UNIT Is Installed)

────────────────────────────────────────────────────

3.6.2 Setting the Real-time Printing Function

The input waveform (recorder waveform) is continuously printed in real time.

Procedure Screen: PRINTER

1. Press the

SYSTEM

2. Move the flashing cursor to the

3. Use the function keys to make a setting.

Function

display

Meaning

Printing is disabled.

Printing is enabled.

key to display the PRINTER screen.

Realtime Print

item.

NOTE

When the recorder's time axis is set to 200 ms/DIV or faster, the real-time printing settings are automatically disabled. Further, when the time axis range is set to a speed faster than 200 ms/DIV, Real-Time Printing is automatically disabled.

While the printer always outputs the data at the measurement magnification in recording mode, the waveform on the screen is reduced in size at the ratio shown in the table below, depending on the time-axis range. 50 ms/DIV x 1/2, 20 ms/DIV x 1/5, 10 ms/DIV x 1/10

Setting a time axis range faster than 1 s/DIV may result in light printing.

────────────────────────────────────────────────────

3.6 Setting The Printer (Only When The 8994 PRINTER UNIT Is Installed)

────────────────────────────────────────────────────

3.7 Setting the Auto Save Function

When the function is enabled, measurement data are automatically stored on a floppy disk, PC card, MO disk or connected SCSI device after they are captured and the recording is completed. The Auto Save function stores a file in the directory currently selected on the file screen.

Procedure Screen: STATUS

1. Press the

SYSTEM

2. Move the flashing cursor to the

3. Use the function keys, select the media for auto saving.

Function

display

key to display the STATUS screen.

Auto Save

Meaning

Auto save is disabled.

Automatically stored on floppy disk

item.

Automatically stored on PC card.

Automatically stored on connected SCSI

device.

Automatically stored on MO disk.

Automatically stored on LAN.

4. Move the flashing cursor to

Function

display

Meaning

Data are stored as binary data.

Data are stored as text data.

, and select the format.

type

Data stored in the text format is not readable by the 8855.

5. When the data format to be saved is set to text data, the intermittent setting item is displayed. Use the function keys or Jog/Shuttle control to make a setting.

6. Set the file name. For the input method, refer to Section 5.4.3. When using auto-save, a number is appended to the name you specify as the file name. This then becomes the file name. If you start procedures before specifying a file name, AUTO is automatically enabled.

7. Set whether a new directory is created when measurement data is saved.

8. Select the channels to be saved. Move the flashing cursor to the

item.

Save

────────────────────────────────────────────────────

3.7 Setting the Auto Save Function

Channel to

────────────────────────────────────────────────────

9. When Media is selected, the Storage method item appears.

Function

display

Meaning When [Make directory] is set to [NONE], auto-

save is cancelled when the storage media is full, or when the directory's file count exceeds 5000. When [Make directory] is set to [EXIST], a new directory is created each time the current directory's file count exceeds 5000, until the storage media fills up, causing auto-save to cancel.

When the media becomes full, old files are

deleted to make room for automatic storage. When 1 Block Save is selected with the Binary Format, the file extension 'MEM' or 'REC' are deleted. If sequential save is selected, or if the saving data is 'R&M', this setting is invalid. When All Block Save is selected with the Binary Format, this operation is disabled. With the text format selected, files with the extension 'TXT' are deleted.

10. Set the data save area. Select to save all of the waveform data or only the data between cursors A and B.

NOTE

11. Select the item to be stored.

Function

display

Meaning

1 block save of recorder data

1 block save of memory data

All block save both recorder and memory data

File names consist of 8 characters. With auto-save, since numbers are attached to the end of file names, long file names are truncated when this number is appended to the end of the file name.

When automatic storage is selected for both recorder and memory data, automatic storage is activated (an index file is created). If only recorder or memory is set for storage, 1 block save is performed.

When auto-save is enabled, the storage channel cannot be selected. Data for the channel for which the waveform is displayed is saved. For details on auto saving file name,

see to Quick Start Section 10.7

When the recording length of the recorder is set to "CONT.", the auto-saving cannot be made a setting.

When cursor A and B are enabled, their setting will be preferred. If additional recording is enabled, only newly acquired waveforms are saved.

Even when A and B cursors appear on the screen, no partial save is performed. The same media is used for both the recorder and memory. Separate media

cannot be selected. The directory and the number of files that can be stored in the directory are

limited. For details,

see Quick Start Section 10.7

During automatic storage, if the STOP key is pressed to interrupt measurement, waveforms taken prior to the interruption are stored automatically.

Do not use the symbols +, =, and [,] in a file name. A file containing any of these symbols in its file name cannot be processed under Windows 2000 or XP.

────────────────────────────────────────────────────

3.7 Setting the Auto Save Function

────────────────────────────────────────────────────

3.8 Simultaneous Display of Recorder and Memory Waveforms

A recorder waveform and memory waveform can be displayed simultaneously on the screen.

This allows trigger activation using memory to analyze in detail an incident that occurs during recording.

Top :Recorder waveform

Bottom :Memory waveform

Use with memory segmentation

By using memory segmentation, you can divide an incident during recording on the recorder into a set number of blocks.

The numbers shown on the recorder waveform display at the top represent the number of times data is loaded into memory blocks and the related trigger positions.

Waveform scroll

When the blinking cursor is on the time axis or zoom for the memory waveform at the bottom of the screen, or when the VIEW function is ON, the MEM waveform can be scrolled. Otherwise, the REC waveform can be scrolled.

Search will be performed on the MEM waveform. To search the REC waveform, switch the screen for REC waveform display only.

The waveform print after measurement, numeric data print, and A/B cursors are for MEM waveforms only.

NOTE

────────────────────────────────────────────────────

There is dead time between recorder startup and memory startup (trigger

standby) due to internal processing.

When memory segmentation has been performed, dead time occurs due to display and interblock processing.

3.8 Simultaneous Display of Recorder and Memory Waveforms

────────────────────────────────────────────────────

3.9 Start and Stop Operation (REC&MEM)

Setting the 8855

STATUS Settings Channel Settings Trigger Settings

See Section 3.3, "STATUS Settings", Chapter 5, "Input Channel Settings", Quick Start Chapter 7, "Trigger Functions."

Measurement start

Recorder waveform

Trigger condition

Recording end

Memory

waveform

are met

Press the

START

key and LED light.

Setting the trigger to Timer causes a delay until the set time.

Displays "Storing" during storing the recorder waveform.

When the printer is enabled, the recording waveform is printed at the same time it is displayed.

Using the VIEW key to display the time (from measurement started time). Data recording starts when trigger condition of memory waveform is met.

When Pre-Trigger is enabled during waveform storage, if the trigger conditions are met before the trigger point, data collection begins at that time.

When automatic storage is enabled and measurement is interrupted in progress, measurement data taken prior to the interruption point is stored automatically.

Auto save is executed.

Measurement end

Trigger mode SINGLE

REPEAT

End of measurement

Starts measurement again. Waveform data stored in memory blocks is cleared. Press the

TIMER

Measurement is repeated at the set time interval until the specified stop time.

During storing the waveform data, the following message is displayed: "MEMORY WAVE WAIT TRIG": Waiting for trigger "MEMORY WAVE STORING": Storing memory waveform "MEMORY WAVE STORE END": End of storing memory waveform When using the sequential save function: "MEMORY WAVE XXX/000": Displays stored block (XXX: the last stored block, 000: number of memory divisions)

NOTE

Numeric operation is possible using the memory function for a memory waveform loaded using the Recorder & Memory function. When memory segmentation is OFF, waveform processing is also possible. Note that when waveform processing is performed, the recorder waveform loaded by the Recorder & Memory function will be lost.

STOP

key.

────────────────────────────────────────────────────

3.9 Start and Stop Operation (REC&MEM)

────────────────────────────────────────────────────

Chapter 4

4.1 Overview of the FFT Function

The FFT function has the following features.

(1) FFT (Fast Fourier Transform) processing can be performed on input signal

data for frequency analysis.

(2) Frequency range

133 mHz to 8 MHz

(3) Frequency resolution

1/400, 1/800, 1/2000, 1/4000 of frequency range

(4) 12 types of analysis functions

Storage waveform, linear spectrum, RMS spectrum, power spectrum, autocorrelation function, histogram, transfer function, cross-power spectrum, cross- correlation function, unit-impulse response, coherence function, octave analysis

(5) Analysis modes

1-channel FFT, 2-channel FFT

(6) Analysis of data stored with memory recorder function and recorder and

memory function possible

(7) Switchable anti-aliasing filter

Automatic selection of cutoff frequency to match frequency range (8953-10 HIGH RESOLUTION UNIT)

NOTE

We recommend using an input module equipped with an anti-aliasing filter

that can be enabled to minimize sampling distortions during FFT analysis.

Refer to Appendix 3.9, "FFT Function" for more information about aliasing

distortion and anti-aliasing filters.

FFT Function

────────────────────────────────────────────────────

4.1 Overview of the FFT Function

────────────────────────────────────────────────────

4.2 Operation Sequence (FFT)

Preparation

See Chapter 2

Basic Settings

Settings on the STATUS screen

See Section 4.3

Press the the STATUS screen.

STATUS

key to display

Installation of the Instrument Turn on the power Connect the inputs

Function

FFT mode

Select the FFT function.

Select the using channels (1 channel or 2 channels)

Frequency range

Set the maximum value of frequency range.

Number of FFT point

Set the number of points for FFT analysis

Window function

Set the window function to get input signal.

Display format

Set the display and print formats for the input signal or analysis result. For single and dual screens, set peak value display.

Setting the printer

See Section 4.4

Reference data

FFT analysis mode

Averaging

Interpolation

Waveform evaluation

Setting the print mode

Set the new data or memory waveform data for the FFT analysis.

FFT analysis mode Analysis channel X- and Y- axis display Display scale

Set the averaging type and count.

Select waveform display format (dot/line)

(item setting/stop mode)

Select the format, waveform, or numerical value should be used to output measured data and calculation results.

Select whether or not to print out the waveform automatically after it is captured.

Saving the file

See

Section 4.5

────────────────────────────────────────────────────

4.2 Operation Sequence (FFT)

Auto save function Select whether or not to save the

waveform automatically after it is captured.

────────────────────────────────────────────────────

Setting the input channel

Settings on the channel screen

Settings the advanced function

Setting the trigger function

See

Quick Start

Chapter 7

Start measurement

Press the When the trigger conditions are met, measurement start. Press the

See Quick Start Chapter 6

Waveform display color Voltage axis range Input coupling Magnification/compression along voltage Anti-aliasing filter

Zero position Zero adjustment Low-pass filter

Comment function See Section 5.4

Trigger mode Trigger source Pre-trigger Trigger selection

START

STOP

key and the LED lights.

key and the LED goes out after measurement has finished.

Processing measurement data

Measurements on display screen

Stop measurement

Setting the system

Press the SYSTEM screen.

See Quick Start Chapter 9

SYSTEM

key to display the

Printing the measurement data (See Chapter 10) Saving the measurement data (See Quick Start Chapter 10)

Using the A-B cursor (See Quick Start Section 8.2)

Set up (See Quick Start Section 9.2) Saving the file (See Quick Start Section 9.3) Printer (See Quick Start Section 9.4) Interface (See Chapter 11) Initialize (See Quick Start Section 9.5) Self-check (See Quick Start Section 9.6)

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4.2 Operation Sequence (FFT)

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4.3 STATUS Settings (FFT)

See Sections

4.3.1

4.3.2

4.3.3

4.3.4

4.3.5

4.3.6

4.3.7

4.3.17

Press the

STATUS

key to access the STATUS screen. This section explains how to set the STATUS screen of the FFT function. See the corresponding sections for items that can be set in the Waveform display or CHANNEL screens. Waveform display screen: CHANNEL screen:

See Quick Start Section 6.3

See Section 4.6

4.3.8 4.3.9

4.3.10

4.3.11

4.3.12

4.3.13

4.3.14

4.3.15

4.3.16

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4.3 STATUS Settings (FFT)

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4.3.1 Setting the Function Mode

The 8855 has four function modes. Select the FFT function.

Procedure Screen: STATUS, CHANNEL, Waveform display, TRIGGER

1. Use the Menu keys to display the desired screen.

2. Move the flashing cursor to the top position.

3. Select the

Function

display

function key display.

FFT

Meaning

Memory recorder function

Recorder function

Recorder & Memory recorder function

FFT function

4.3.2 Setting the FFT Channel Mode

This setting determines whether only one channel (1ch-FFT) or two channels (2ch-FFT) are used for FFT processing. When "1ch-FFT" is selected, certain FFT analysis modes will not be available.

Screen: STATUS Procedure 1. Use the Menu keys to display the desired screen.

NOTE

2. Move the flashing cursor to the

3. Use the function key to make the selection.

Function

display

The following analysis functions are not possible in 1-channel FFT mode: Transfer function (TRF), cross-power spectrum (CSP), cross-correlation function (CCR), unit impulse response (IMP), coherence function (COH)

Meaning

One channel

Two channels

FFT Mode

item.

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4.3 STATUS Settings (FFT)

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4.3.3 Setting the Frequency Range

The frequency range (frequency axis maximum value) can be set as follows. The frequency range corresponds to the time axis range (TIME/DIV) setting of the memory function.

Screen: STATUS, Waveform display Procedure 1. Use the Menu keys to display the desired screen.

2. Move the flashing cursor to the

Frequency Range

3. Use the function key to make the selection. You can also use the TIME/DIV knob to make the settings. In this case, you can change the settings irrelevant of the position of the flashing cursor.

Function

display

Meaning

Move the cursor up in the selection window.

Move the cursor down in the selection window.

item.

NOTE

External sampling

The anti-aliasing filter cutoff frequency is the same as the selected frequency range.

When "EXT." was selected, octave analysis cannot be carried out.

To use external sampling, see Quick Start Section 11.1.4.

Frequency Range, Frequency Resolution, Window Width, Corresponding Time Axis Range (when the number of FFT points is 1000)

Frequency range

[Hz]

8M*

4M*

2M*

800 k*

400 k*

200 k*

80 k*

40 k 100 10 ms 1ms 20 k 50 20 ms 2ms

8k 20 50 ms 5ms 4k 10 100 ms 10 ms

2k 5 200 ms 20 ms 800 2 500 ms 50 ms 400 1 1s 100 ms 200 500 m 2s 200 ms

80 200 m 5s 500 ms

40 100 m 10 s 1s

20 50 m 20 s 2s

1.33 *

667 m*

333 m*

133 m*

Frequency

resolution*

[Hz]

20 k 50 µs 5 µs 10 k 100 µs 10 µs

5k 200 µs 20 µs 2k 500 µs 50 µs

1k 1ms 100 µs 500 2ms 200 µs 200 5ms 500 µs

20 m 50 s 5s 10 m 100 s 10 s

3.33 m 5 min 30 s

1.67 m 10 min 1 min

0.83 m 20 min 2 min

0.33 m 50 min 5 min

Window width*

Time axis

[ /DIV ]

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4.3 STATUS Settings (FFT)

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The cutoff frequency of the anti-aliasing filter is the same as the selected frequency range, except for the cases listed below.

*1: Anti-aliasing filter is OFF. *2: Cutoff frequency is 20 Hz.

*3: FFT Number of Points values of 2000, 5000 and 10,000 correspond to

multiples of 1/2, 1/5 and 1/10, respectively.

*4: FFT Number of Points values of 2000, 5000 and 10,000 correspond to

multiples of 2, 5 and 10, respectively.

4.3.4 FFT Number of Points Setup

This setting determines the sample count (Number of Points) used for FFT calculation. A higher setting increases the frequency analysis capability, but also increases the processing time required.

Screen: STATUS, Waveform display Procedure 1. Use the Menu keys to display the desired screen.

2. Move the flashing cursor to the

Sampling point

3. Use the function key to make the selection.

Function

display

Meaning

item.

1000 points FFT calculation

2000 points FFT calculation

5000 points FFT calculation

10000 points FFT calculation

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4.3 STATUS Settings (FFT)

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4.3.5 Setting the Window Function

The window function defines the segment of the input signal that will be processed. Window processing can be used to minimize leakage error.

Screen: STATUS, Waveform display Procedure 1. Use the Menu keys to display the desired screen.

2. Move the flashing cursor to the

Window

3. Use the function key to make the selection.

Function

display

Meaning

Rectangular (effective on discrete waveforms)

Hanning (effective on continuous waveforms)

Exponential (effective on decaying waveforms)

item.

4. If

EXPO.

was selected, the coefficient item is displayed. Select the attenuation ratio in percent, using the function keys or the Jog/shuttle controls. If coefficient (attenuation ratio) is set to 0%, processing will be carried out as 0.1%.

Function

display

Meaning

Increases in number, small step

Decreases in number, small step

Noise on attenuated waveform is reduced

Waveform captured in one operation

100%

10%

100%

When setting of exponential window function attenuation ratio 10%

NOTE

When measurements are taken using the Hanning window or exponential window, note that the calculation results in the display of a value that is lower than the amplitude obtained when using a rectangular window.

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4.3 STATUS Settings (FFT)

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4.3.6 Setting the Peak Function

Display the peak or maximum value of the input signal and analyzed results. This is available only when the Format is set to Single or Dual display.

Screen: STATUS Procedure 1. Press the

2. Move the flashing cursor to the

3. Use the function key to make the selection.

Function

display

STATUS

key to display the screen to be displayed.

item.

Peak

Meaning

OFF

Peak value

Maximum value

Peak value display

When data at one point are higher than data within the vicinity, the point is a peak. The 10 highest peaks are shown.

Peak 1

Maximum value display

, ---Data

Peak 2

Points with the 10 highest values are shown.

Maximum value 1

, ---Data

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4.3 STATUS Settings (FFT)

────────────────────────────────────────────────────

4.3.7 Selecting Reference Data

Select data to be used for FFT processing.

Screen: STATUS Procedure 1. Press the

2. Move the flashing cursor to the

3. Use the function keys to make a setting.

Function

display

NEW DATA

STATUS

key to display the STATUS screen.

Reference

Meaning

Capture new waveform data for FFT processing

Use stored waveform data for FFT processing

item.

NOTE

Pressing the

START

key initiates measurement, reads the number of samples

specified as the FFT Number of Points, and FFT processing is performed.

FROM MEM

Pressing the

START

key initiates FFT processing of the specified FFT Number of Points, from the start of the data (Memory Recorder or memorized Recorder & Memory waveform) that has been stored in memory. The starting point for calculation can be specified using the cursor on the screen with the stored Recorder & Memory waveform displayed. If the A-B cursors are used, the FFT calculation is performed on the specified

Sampling point

beginning with whichever cursor is foremost. When a memory waveform is selected, the frequency is automatically set to correspond with the time axis as indicated in frequency range setup table in section 4.3.3.

If a memory waveform is the reference data when the trigger mode is Continuous and Automatic, FFT processing is performed on the waveform data collected by the Memory Recorder function for the specified FFT Number of Points, and then shifted by that amount and processed again, until all data has been processed. (If the data is shorter than the FFT Number of Points, no processing occurs.)

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4.3 STATUS Settings (FFT)

────────────────────────────────────────────────────

4.3.8 Setting the Display Format

You can set the format for displaying input signal waveforms on the screen and recording them on the printer. The SINGLE, DUAL, and NYQUIST formats are available.

Screen: STATUS Procedure 1. Press the

2. Move the flashing cursor to the

3. Use the function key to make the selection.

Function

display

STATUS

key to display the screen to be displayed.

Format

Meaning

Single screen

Dual screen

Nyquist screen

item.

Single graph

Displays the waveform on a single screen.

NOTE

The peak value is displayed on the screen and printed out, but it is not recorded as the peak value in data storage.

Dual graph

Divides the waveform display screen into upper and lower screens.

Nyquist graph

For the linear spectrum, cross power spectrum, and transfer function, displays the real-number portion of the data for the FFT calculation result on the X-axis, and the imaginary number portion of the data on the Y-axis.

────────────────────────────────────────────────────

4.3 STATUS Settings (FFT)

────────────────────────────────────────────────────

4.3.9 Setting the Averaging Function

The averaging function allows capturing several instances of a waveform and determining the average.

This makes it possible to eliminate noise and irregular signal components.

Averaging for the time axis waveform and frequency axis waveform can be selected.

Procedure Screen: STATUS, Waveform display

1. Use the Menu keys to display the desired screen.

2. Move the flashing cursor to the

Averaging

3. Use the function keys to make a setting.

Function

display

Meaning

Disable averaging

Perform time axis waveform simple averaging

item.

Perform time axis waveform exponential

averaging

Perform frequency axis waveform simple

averaging

Perform frequency axis waveform exponential

averaging

Frequency axis waveform peak hold

4. Move the flashing cursor to the

Number

item, and set the time of averaging

count by using the Jog/Shuttle controls or function keys.

Function

display

Meaning

Move the cursor up in the selection window.

Move the cursor down in the selection window.

Time axis waveform averaging

(1) Averages collected waveform data (2) FFT processing is then performed on the averaged values When the trigger mode is AUTO When the

START

key is pressed, data are captured even if trigger conditions are not fulfilled after a certain interval. If averaging is applied to unsynchronized input signals, the result will be meaningless.

Frequency axis waveform averaging

Unlike time axis averaging, the results are valid also if no trigger synchronization is used. But if the characteristics of the input waveform allow triggering, using the trigger for synchronization is recommended. (1) Captured data first undergo FFT processing. (2) Averaging is performed and the result is displayed.

────────────────────────────────────────────────────

4.3 STATUS Settings (FFT)

────────────────────────────────────────────────────

Frequency axis peak hold

The specified number of samples are captured, and the peak value is held (stored) for each frequency.

NOTE

For details on summing averaging and exponential averaging, refer to

Appendix 3.5.

When averaging is used together with the waveform evaluation function, waveform evaluation is carried out after the specified averaging count is completed.

After calculating the average, changing the analysis channel does not cause

recalculation.

FFT analysis mode and averaging

z: Setting is valid

- : Setting is invalid (has no effect)

Frequency

axis

averaging

z z z z

z z

z z z z

z z

Peak hold

z z

FFT analysis mode Y-axis

Storage waveform

Linear spectrum

RMS spectrum

Power spectrum

Auto correlation function

Histogram

Transfer function

Cross power spectrum

Cross correlation function

Unit impulse response

Coherence function

Octave analysis

(Linear) z z -

LIN-REAL LIN-IMAG LIN-MAG LOG-MAG PHASE

LIN-MAG LOG-MAG

(Linear) z z z

(Linear) z - -

LIN-REAL LIN-IMAG LIN-MAG LOG-MAG PHASE

(Linear) z z z

LIN-MAG LOG-MAG

Time axis averaging

z z z z z

z z

z z z z z

z z

Same for linear spectrum, transfer function, and cross-power spectrum with Nyquist display.

────────────────────────────────────────────────────

4.3 STATUS Settings (FFT)

────────────────────────────────────────────────────

Averaging and trigger mode

(1) Trigger mode: SINGLE

1. After the

START

key was pressed, data are captured whenever the trigger conditions are fulfilled, averaging is carried out, and then the waveform is displayed. Collected waveform data is averaged with the FFT time axis waveform and FFT processing is performed. FFT processing is performed on the frequency axis and the calculated result is averaged.

2. Trigger occurs when the trigger conditions are fulfilled again.

3. When the specified number of data has been captured, measurement stops automatically. If the measurement was stopped prematurely with the

STOP

key, the averaging result up to that point is displayed.

When the frequency axis waveform

FFT

When the time axis waveform

FFT

Input

Trigger conditions

fulfilled

Waveform averaging count = less than specified number

Waveform capture Averaging Display End

(for recording length)

Waveform averaging count = specified number

(2) Trigger mode: REPEAT

1. After the

START

key was pressed, data are captured whenever the trigger conditions are fulfilled, and averaging is carried out until the specified averaging count. The averaging result is shown on the display.

2. Trigger occurs when the trigger conditions are fulfilled again. The waveform data is cleared and the trigger occurs when the trigger conditions are fulfilled again

3. When the specified averaging count is reached, data up to that point are discarded, and new data are captured for averaging. If the measurement was stopped prematurely with the

STOP

key, the averaging result up to that point

is displayed.

When the frequency axis waveform

FFT

When the time axis waveform

FFT

Input

────────────────────────────────────────────────────

4.3 STATUS Settings (FFT)

Trigger conditions

fulfilled

Waveform capture Averaging Display End

(for recording length)

After specified count

The STOP key is pressed

────────────────────────────────────────────────────

(3) Trigger mode: AUTO

(Time axis waveform) When the

START

key is pressed, data are captured even if trigger conditions are not fulfilled after a certain interval. If averaging is applied to unsynchronized input signals, the result will be meaningless. (Frequency axis waveform)

1. After the

START

key was pressed, data are captured whenever the trigger conditions are fulfilled, and averaging is carried out until the specified averaging count. The averaging result is shown on the display.

2. When the specified number of data has been captured, measurement stops automatically.

3. If the measurement was stopped prematurely with the

STOP

key, the

averaging result up to that point is displayed.

If the trigger condition does not occur within the specified period, waveform data input begins anyway.

Input

Trigger conditions

fulfilled

Waveform

capture

FFT Averaging Display End

4.3.10 Setting the Interpolation (dot-line)

This setting determines whether the input waveform (sampling data) is to be displayed and printed as a series of dots or a line using linear interpolation.

Procedure Screen: STATUS

1. Press the

STATUS

2. Move the flashing cursor to the

3. Use the function keys to make a setting.

Function

display

key to display the STATUS screen.

Dot-Line

Meaning

Press the STOP key

item.

Linear interpolation is not performed.

Linear interpolation is performed.

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4.3 STATUS Settings (FFT)

────────────────────────────────────────────────────

4.3.11 Setting the Waveform Evaluation

Display format can be set on single screen or Nyquist screen. GO (pass) or NG (fail) evaluation of the input signal waveform can be performed using an evaluation area specified by the user. This can serve to detect irregular waveforms. After the evaluation result is generated, signals are output from the GO/NG terminal. All the channels being displayed are evaluated.

Procedure Screen: STATUS

1. Press the

STATUS

2. Move the flashing cursor to the

3. Use the function keys to make a selection.

Function

display

Meaning

Disable waveform evaluation

Return NG if any part of the waveform leaves the evaluation

area

key to display the STATUS screen.

Comparison

item.

NOTE

Return NG if the entire waveform leaves the evaluation area

Evaluation area is created.

Enable waveform evaluation area.

4. If Comparison is set to OUT or ALL-OUT, the

Stop Mode

item will be

displayed. Move the flashing cursor to this item.

5. Use the function keys to make a setting.

Function

display

Meaning

If GO is selected, recording and analysis will stop after an OK

result.

If NG is selected, recording and analysis will stop after an NG

result.

If GO & NG is selected, measurement will stop regardless of

the evaluated results.

When a waveform evaluation area is created by the FFT function, the waveform evaluation area created by the memory recorder function is cleared. For details on the waveform evaluation, refer to Section 9.1.

────────────────────────────────────────────────────

4.3 STATUS Settings (FFT)

────────────────────────────────────────────────────

4.3.12 Setting the FFT Analysis Mode

Used to select the FFT calculation method.

Procedure Screen: STATUS, Waveform display

1. Use the Menu keys to display the desired screen.

2. Move the flashing cursor to the

FFT Mode

3. Use the function keys to make a setting. For details on analysis, please refer to 4.8 FFT Analysis Function.

item.

Function

display

Meaning

Stored waveform

Linear spectrum

RMS spectrum

Power spectrum

Auto correlation

function

Flashing cursor

Function

display

Transfer function

Cross power spectrum

Cross correlation

function

Impulse response

Coherence function

Meaning

Histogram

Octave analysis

────────────────────────────────────────────────────

4.3 STATUS Settings (FFT)

────────────────────────────────────────────────────

4.3.13 Setting the Analysis Channel

Select the channel for FFT analysis.

Procedure Screen: STATUS, Waveform display

1. Use the Menu keys to display the desired screen.

2. Move the flashing cursor to the

w1orw2

3. Use the function keys or Jog/shuttle control, select the channel.

Function

display

Meaning

Move the cursor up in the selection window.

Move the cursor down in the selection window.

item.

NOTE

Flashing cursor

The values for transmission interval and single impulse response are calculated from (W2)/(W1).

To analyze data without aliasing distortion due to sampling, we recommend that you use a channel input module that is capable of FFT analysis, such as the 8953-10 HIGH RESOLUTION UNIT.

────────────────────────────────────────────────────

4.3 STATUS Settings (FFT)

────────────────────────────────────────────────────

4.3.14 Setting the X-axis and Y-axis Displays

Set the X and Y axis for display of FFT calculation results. Different units can be selected for the X and Y axis. With some FFT analysis modes, one of the axis cannot be set. When external sampling is used, the X-axis (horizontal axis) expresses the data count.

Procedure Screen: STATUS, Waveform display

1. Use the Menu keys to display the desired screen.

2. Move the flashing cursor to the

YAxis

3. Use the function keys or Jog control, select the channel. Set the x-axis in the same way.

Y Axis

Function

display

Meaning

item.

Real number part (linear display)

Imaginary number part (linear display)

Amplitude (linear display)

Amplitude (decibel display)

Phase (degree display)

X Axis

Function

display

Meaning

Frequency (linear display)

Frequency (logarithm display)

(When octave analysis)

Function

display

Meaning

1/3 octave

1/1 octave

Flashing cursor

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4.3 STATUS Settings (FFT)

────────────────────────────────────────────────────

X and Y Axis Settings Available with each FFT Analysis Mode

STR

LIN

RMS

PSP

ACR

HIS

TRF

CSP

CCR

IMP

COH

OCT

FFT analysis mode

Storage Waveform (Time) (Linear)

Linear Spectrum

RMS Spectrum

Power Spectrum

Auto Correlation Function (Time) (Linear)

Histogram (Volt) (Linear)

Transfer Function

Cross Power Spectrum

Cross Correlation Function (Time) (Linear)

Unit Impulse Response (Time) (Linear)

Coherence Function

Octave Analysis

XAxis

(horizontal axis)

LIN-Hz LOG-Hz

1/3 OCT 1/1 OCT

YAxis

(vertical axis)

LIN-REAL LIN-IMAG LIN-MAG LOG-MAG PHASE

LIN-MAG LOG-MAG

LIN-REAL LIN-IMAG LIN-MAG LOG-MAG PHASE

(Linear)

LIN-MAG LOG-MAG

The item shown by brackets ( ), it is fixed.

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4.3 STATUS Settings (FFT)

────────────────────────────────────────────────────

4.3.15 Setting the Wave Colors

Set the waveform display ON/OFF and the waveform color.

Procedure Screen: STATUS, Waveform display

1. Use the Menu keys to display the desired screen.

2. Move the flashing cursor to the

Wave

3. Use the function keys or Jog control, select the channel. Set the x-axis in the same way.

Function

display

Meaning

Move the cursor up in the selection window.

Move the cursor down in the selection window.

Waveform will be displayed in selected color.

Waveform will not be displayed.

item.

────────────────────────────────────────────────────

4.3 STATUS Settings (FFT)

────────────────────────────────────────────────────

4.3.16 Setting the Display Scale

The display scale for showing the FFT processing result can either be set manually or automatically.

Procedure Screen: STATUS

1. Press the

STATUS

2. Move the flashing cursor to the

3. Use the function keys to make a setting.

Function

display

Meaning

The vertical axis (Y-axis) scale is set automatically, depending on

the processing result.

The vertical axis (Y-axis) scale can be set as desired, to match the

purpose of the measurement. This is useful for enlarging or reducing the am

key to display the STATUS screen.

Scale

litude and for shiftingthe waveform upor down.

item.

4. When

MANUAL

is selected, set the upper and lower limits to display and

record the processing result.

Setting range is -9.9999E+29 to 9.9999E+29. (exponent is E-29 to E+29).

Function

display

Meaning

A number pad will be displayed. Use the cursor and function keys to

specify the value. Press [ fix.] F4 t o confirm.

Reset to the default values.

Return to the previous setting.

An input screen will be displayed. Use the cursor keys to move the

flashing cursor to each digit, and the function keys to edit each value.

NOTE

The unit (eu) setting is affected by the scaling setting. When scaling is turned off, a unit of measurement range is displayed.

The selected unit is displayed for those channels for which the scaling function has been set.

The X-axis setting for the histogram can be changed on the Waveform display screen or the CHANNEL screen. (If the upper or lower limit value is changed, the x-axis is changed.)

────────────────────────────────────────────────────

4.3 STATUS Settings (FFT)

────────────────────────────────────────────────────

4.3.17 Octave Filter Setting

When octave analysis has been selected, two different filter types can be chosen. The characteristics of both filter types are within ANSI CLASS 3 tolerance limits (1/3 octave only).

Procedure

1. Select "OCTAVE ANALYSIS" in FFT analysis mode, and the

2. Move the flashing cursor to the

3. Use the function keys to make a selection.

NOTE

Screen: STATUS

Octave Filter

item is shown.

item.

Function

display

Meaning

Filter characteristics approximate the characteristics used for

conventional octave analyzers with analog filters.

Spectrum components outside the octave band are excluded totally

and only the spectrum in the octave band is bundled and used for anal

sis.

1/1-octave (1/3-octave) normal filter characteristics

Octave Filter

1/1-octave (1/3-octave) sharp filter characteristics

This instrument does not use analog filters. It first determines the entire power spectrum and then uses weighting by bundling the spectrum to achieve the desired filter characteristics.

────────────────────────────────────────────────────

4.3 STATUS Settings (FFT)

────────────────────────────────────────────────────

4.4 Printout of FFT Processing Results (When 8994 PRINTER UNIT is installed.)

4.4.1 Setting the Print Mode

Select the format, waveform, or numerical value should be used to output FFT processing results.

Procedure

(1) Setting the printer format

1. Press the

2. Move the flashing cursor to the

3. Use the function keys to make a setting.

(2) Setting the print interval

1. When the numerical value is selected, set the print interval. (unit: points)

2. Move the flashing cursor to the

3. Use the function keys to make a setting.

Screen: PRINTER

SYSTEM

Function

display

Function

display

Meaning

The result of calculation are printed as a waveform.

The result of calculation are printed as numeric data.

Meaning

Move the cursor up in the selection window.

Move the cursor down in the selection window.

key to display the PRINTER screen.

Print Mode

Interval

item.

4.4.2 Setting the Auto Print Function

Printout is automatically carried out after FFT analysis.

Procedure Screen: PRINTER

1. Press the

SYSTEM

2. Move the flashing cursor to the

3. Use the function keys to make a setting.

Function

display

────────────────────────────────────────────────────

4.4 Printout of FFT Processing Results (When 8994 PRINTER UNIT is installed.)

Meaning

Auto print is disabled.

Automatically print the FFT processing results to the

internal printer.

Automatically transfer the FFT processing results to

the LAN connected device. O

tional 9333 LAN COMMUNICATOR is required.

key to display the PRINTER screen.

Auto Print

item.

────────────────────────────────────────────────────

4.5 Setting the Auto Save Function

The FFT analysis is carried out and measurement data are automatically stored on a floppy disk, PC card, MO connected SCSI, or built-in MO/HD device after they are captured. The Auto Save function stores a file in the directory currently selected on the file screen. See Quick Start Section

10.13.2.

Procedure

1. Press the

2. Move the flashing cursor to the

3. Use the function keys, select the media for auto saving.

4. Move the flashing cursor to

Screen: STATUS

STATUS

Function

display

Function

display

Meaning

Auto save is disabled.

Automatically stored on floppy disk

Automatically stored on PC card.

Automatically stored on MO/HD.

Automatically stored on external MO connected SCSI

device.

Automatically stored on LAN-connected device.

(Optional 9333 LAN Communicator is required.)

Meaning

key to display the STATUS screen.

Auto Save

, and select the format.

type

item.

Data are stored as binary data.

Data are stored as text data.

(Nyquist cannot be saved in the text format)

Data stored in the text format is not readable by the 8855.

5. Set the file name. For the input method, refer to Section 5.4.3. When using auto-save, a number is appended to the name you specify as the file name. This then becomes the file name. If you start procedures before specifying a file name, AUTO is automatically enabled.

6. Set whether or not to create a new directory when saving.

7. Move the flashing cursor to

Function

display

Meaning

When the media becomes full, automatic storage

stops.

When the media becomes full, old files are deleted to

make room for automatic storage.

method

, and select the format.

With the binary format selected, the file with the extension 'FFT' is deleted. With the text format selected, files with the extension 'TXT' are deleted.

────────────────────────────────────────────────────

4.5 Setting the Auto Save Function

────────────────────────────────────────────────────

NOTE

File names consist of 8 characters. With auto-save, since numbers are attached to the end of file names, long file names are truncated when this number is appended to the end of the file name.

When auto-save is enabled, the storage channel cannot be selected. Data for the channel for which the waveform is displayed is saved.

For details on auto saving file name, refer to Quick Start Section 10.7.

When both auto-print and auto-save are enabled, auto-save takes precedence.

For details on connected SCSI device, refer to Quick Start Section 10.4.

The directory and the number of files that can be stored in the directory are limited. For details, see Quick Start Section 10.7.

Thinning is not applied with FFT data text format storage.

Do not use the characters and symbols below in a file name. A file containing any of these characters/symbols in its file name cannot be processed under Windows 2000 or XP. Full-size lowercase letters: a to z Full-size characters: π, µ, ε Half-size symbols: +, =, [,]

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4.5 Setting the Auto Save Function

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4.6 Settings on the Waveform Display Screen (FFT)

Explains the setting items on the Waveform display screen. For details, refer to Sections 4.3. When want to use the Jog/Shuttle control, press the selection window is not displayed.)

VALUE

select key. (The

1 2

Setting items Selection Explanation

1. Function

2. Frequency range

3. Window function

MEM, REC, FFT, REC&MEM

133 mHz to 8 MHz (24 steps), EXT

Rectangular, hanning, exponential

Select function.

Set the maximum value of the frequency axis.

Set a window function that uses multiples when reading an input signal.

4. Trigger mode

5. Pre-trigger

6. Wave color

SINGLE, REPEAT, AUTO

0to100%,-95%

ON/OFF, desired color

Select trigger mode.

Set the Pre-trigger.

Set the waveform display to ON/OFF and the waveform color.

7. Analysis mode

Select from 12 items.

Selects the FFT analysis method. See Section 4.8.

8. Analysis channel

9. X-, Y-axis

Select from channel 1 to using channels

X axis Frequency (linear/logarithm display) When octave analysis: 1/3, 1/1 octave Y axis Real number part (linear), imaginary number part (linear), amplitude (linear/dB), phase (deg)

Selects the channel for FFT analysis.

Sets the X-and Y- axis for display of FFT calculation results. With some FFT analysis mode, one of the axis cannot be set.

7 8

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4.6 Settings on the Waveform Display Screen (FFT)

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4.7 Start and Stop Operation (FFT)

Setting the 8855

STATUS Settings Channel Settings Trigger Settings

See Section 4.3, "STATUS Settings (FFT)", Quick Start Chapter 6, "Input Channel Settings", Quick Start Chapter 7, "Trigger Functions".

Measurement start

Trigger condition

are met

Recording start

Recording end

Press the

START

key and LED light. When the pre-trigger is set, the trigger will not be registered for a certain period after the start of measurement. (During this interval, "Pre-trigger standby" is shown on the display.) When the trigger can be registered, the indication "Waiting for trigger" is shown on the display.

Data recording starts when trigger condition are met. When trigger mode selected AUTO, instrument waits for about 1 second for trigger conditions to be met. After this interval, data recording starts, regardless of trigger state.

Displays "Storing". When the printer is enabled, the recording waveform is printed at the same time it is displayed.

When the

STOP

key is pressed twice during measurement, the

8855 is forcibly stopped.

The FFT calculation result display, auto-print, and automatic storage is not performed.

After capturing measured data, the FFT analysis is carried out and then the result is displayed. Auto printout and auto save are executed.

Measurement end

Trigger mode SINGLE

REPEAT AUTO

End of measurement

Each time when trigger conditions are met, data are recorded and memory contents are overwritten.

End of measurement in REPEAT and AUTO trigger modes When the

STOP

key is pressed once during measurement, the 8855 acquires measurement data in an amount corresponding to the set recording length, and the FFT analysis is carried, and then the measurement is stopped. (FFT analysis result, auto printout, auto save are executed.) When the

STOP

key is pressed twice, the measurement is stopped forcibly. (FFT analysis result, auto printout, auto save are not executed.)

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4.7 Start and Stop Operation (FFT)

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4.8 FFT Analysis Function

4.8.1 Storage Waveform [STR]

Displays the time domain waveform of the input signal.

Function

Horizontal

cursor

Vertical

cursor

Example Stored waveform

Time Time axis display

Indicates the value of the specified TIME/DIV frequency range. (Refer to the table "Frequency Range, Frequency Resolution, Window Width, Corresponding Time Axis Range" in Section

4.3.3.)

Linear Indicates the value of the measurement range of the input

module in voltage units.

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4.8 FFT Analysis Function

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4.8.2 Linear Spectrum [LIN]

Displays the frequency domain waveform of the input signal, including magnitude and phase information. Major applications include:

Determining the peaks of waveform frequency components Determining the levels of high and low harmonics

Function

Horizontal

cursor

Vertical

cursor

Fa = (fa) = |Fa|exp(jθa) =|Fa|(cos θa+jsin θa)

LIN-Hz Frequency spectrum display as linear units.

The range is from DC to the maximum frequency range value.

LOG Hz Frequency spectrum display as logarithmic units.

The range is from between 1/400 and 1/4000 of value to the frequency range value.

Real Linear display of real-number part of the data as voltage

(Nyquist mode)

LIN-REAL Linear display of real-number part of the data as voltage LIN-IMAG Linear display of imaginary-number part of the data as voltage LIN-MAG Linear display of analysis data as voltage LOG-MAG Logarithmic display of analysis data as dB

(0dB reference value: 1 V peak=2V p-p) PHASE Degrees (deg) display of phase component of data Imag Linear display of imaginary-number part of the data as voltage

(Nyquist mode)

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4.8 FFT Analysis Function

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Examples Linear spectra waveforms

Stored waveform

Y-axis: LIN-IMAG (X-axis: LOG-Hz)

Y-axis: LOG-MAG (X-axis: LOG-Hz)

Y-axis: LIN-REAL (X-axis: LOG-Hz)

Y-axis: LIN-MAG (X-axis: LOG-Hz)

Y-axis: PHASE (X-axis: LOG-Hz)

Nyquist

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4.8 FFT Analysis Function

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4.8.3 RMS Spectrum [RMS]

Displays the frequency domain waveform of the input signal, including magnitude (effective value) and phase information. The LOG-MAG displays of RMS spectrum and Power spectrum express the same processing result. Major applications include:

Determining the peaks of waveform frequency components. Determining the effective values of frequency components.

Function

Horizontal

cursor

Ra = Fa

=|Ra|exp(jθa)

=|Ra|(cos θa+jsin θa)

LIN-Hz Frequency spectrum display as linear units. The range is from

DC to the maximum frequency range value. LOG-Hz Frequency spectrum display as logarithmic units. The range is

from between 1/400 and 1/4000 of value to the frequency

range value.

Vertical

cursor

value: 1 V rms) PHASE Degrees (deg) display of phase component of data

Examples RMS spectra waveform

Stored waveform

DC components: Ra = Fa

08-23, 30, 31, 32, 33, 34

Y-axis: LIN-REAL (X-axis: LOG-Hz)

Y-axis: LIN-IMAG (X-axis: LOG-Hz) Y-axis: LIN-MAG (X-axis: LOG-Hz)

Y-axis: LOG-MAG (X-axis: LOG-Hz) Y-axis: PHASE (X-axis: LOG-Hz)

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4.8 FFT Analysis Function

Hioki 8855 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual