Hioki DSM-8542 Instruction Manual

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Instruction Manual

DSM-8542

DIGITAL SUPER

MEGOHMMETER

July 2013 Revised edition 1 DS8542A981-01 13-07H

Preface

Thank you for purchasing the DSM-8542 and welcome to the growing family of HIOKI’s Digital Supe r Megohm Meters/Current Mete rs. The DSM-8542 is an insulation resistance meter up to 1000V in measuring voltage. Incorrect operation of the meter potentially causes an electric shock or damage to a sample. Please read this manual thoroughly before using the meter and exercise reasonable caution regarding safety. Keep this manual handy for future reference. The product has been shipped after minute preshipment inspection by HIOKI. Nevertheless, please contact our distributor or sales office near your location in case of a trouble.

I. Product Overview

The Digital Super Megohm Meter DSM-8542 is an insulation resistance meter embedded with a high-sensitivity ammeter. The meter has been developed to measure insulating materials of a high resistance value, capable of measuring resistance within the range of 1 x 10 current within the range of 30fA to 10mA. A liquid crystal display module (240 x 64 dots) of the meter allows easy viewing of needed information and ease of use. The meter is an insulation resistance meter and requires installation of an external power supply unit as a power source for measurement. An external power supply unit for measurement of insulation resistance is a customer supply scope. HIOKI E. E. Corporation supplies a dedicated power supply unit PSU-8541 as an option. PSU-8541 incorporates a low-noise voltage source and is suitable for measuring insulation resistance of insulating materials of large capacities.

Principal Features (When dedicated power supply unit PSU-8541 is used)

to 3 x 1016Ω and a

Measurable voltage range : 0.1 to 1000V Measurable current range : 30fA to 10mA Measurable resistance range : 1 x 10

to 3 x 1016Ω Current limiter setting : 5mA, 10mA, 50mA (0.1 to 250V) : 5mA, 10mA (251 to 1000V) Integral time setting functi on : 2ms to 300ms Trigger delay setting functi on : 0 to 9999ms Automatic averaging measurement function Voltage check function Contact check function Self-calibration function Comparison decision, volume resistivity, surface resistivity computing functions

Data save and search functions Histogram display function Sequence programming function Interlock function GP-IB is a standard provision Handler interface is a standard provision RS-232 is a standard provision

II. About This Operational Manual

• Warning, Caution and Notice

Important safety precautions and operational instructions are described in this manual under the following headings. Strictly follow these precautions and operational instructions.

[Warning]

Indicates a potentially hazardous situation which could result in an electric shock or equipment burning. It is extremely important to strictly follow these instructions to prevent a hazard.

[Caution]

Indicates a caution which could result in equipment damage. Operate the meter exercising reasonable caution.

[Notice ]

Indicates an important item in operation.

III. Organizational Elements of Operational Manual

This operational manual has the following chapters. Please make certain to read the manual carefully before operating the meter.

1. Preparations Before Operation This chapter contains important information such as a check to be made during uncrating, operating power supply and measuring cables.

2. Specification The electrical specification of this meter is described.

3. Operating Principles This chapter contains the operating principles, block diagram and other information.

4. Names and Functions of Components This chapter describes the names and functions of keys and characters printed on the front and rear panels.

5. Preparations for Measurement This chapter describes the screen of the meter for measurement, settings on the screen, operating method, methods for indicating measured values and other matters.

6. Measurement This chapter describes function settings of the meter, connection of measuring terminals, and use of measuring jigs and measuring electrodes.

7. GP-IB Interface This chapter describes control by the GP-IB interface.

8. RS-232 Interface This chapter describes control by the RS-232 interface.

9. External Interfaces This chapter describes the handler interface, external trigger input and interlock input.

10. Maintenance This chapter describes checks and calibration to be made for safe and reliable use of this meter.

11. Product Full View This chapter contains a full view of the product with dimensions.

iii

IV. Safety Precautions

FOR SAFE USE OF THE METER

• Do the power supply voltage of the meter and commercial power supply voltage to be

supplied match? Please check it. Supplying 200V power supply voltage while the power supply voltage of the meter is 100V sometimes causes damage to the meter.

• Be certain to ground the grounding terminal on the rear or the grounding rod of the

power cable to the ground.

V. Safety Alert Symbols

This symbol is marked where the operational manual needs to be referred to.

This symbol indicates high voltage hazard and is indicated on terminals where high voltage is output such as meas uring t erminal s. Indicated on the grounding terminal “GND” on the rear of the meter. If the grounding pin of the power cable cannot be grounded, be certain to ground this terminal.

！

Warning symbol

Electrical

Grounding terminal

VI. Operational Precautions

Please read this manual thoroughly before operating the meter to correctly handle it. Strictly follow all the warning, caution and other messages contained in this manual to prevent accidents and danger.

● Never operate the meter where a combustible gas exists. Otherwise an explosion or

a fire may break out.

● Be certain to ground the grounding pin of the power cable to prevent an accident. If

the grounding pin of the power cable cannot be grounded, be certain to ground the grounding terminal located on the rear of the meter.

● High voltage up to 1000V is output between the measuring terminals on the panel of

this meter. Do not touch areas where a current is impressed during measurement to prevent an electrical shock.

● Do not operate the meter in a dusty place or in a place subjected to vibration, direct

sunshine or steam. Otherwise a meter failure may result.

● Supply the power supply voltage specified in the operational manual. Otherwise a

fire or meter damage may result.

● Do not remove the cover of the meter.

Residual voltage sometimes still remains inside the meter after turning the power off

and it is dangerous to touch the inside of the meter. Please contact our sales office near your location in case of a repair or internal adjustment.

● A cooling fan of a discharge type is installed inside the meter to prevent temperature

rises inside the meter. Poor ventilation of the fan causes meter failures. Provide a space of more than 10cm behind the fan. Do not place anything on the ventilation grills on one side and bottom of the meter.

Contents

1. Preparations Before Operation ····························································1

1.1 Check during Uncrating ····································································· 1

1.2 Operating Power Supply···································································· 1

1.3 Grounding ······················································································ 2

1.4 Measuring Cable·············································································· 2

1.5 Warming Up Time ············································································ 2

1.6 Memory Initializin g ··········································································· 2

2. Specification

2.1 Measurement Performance ································································3

2.1.1 DC current measurement ································································ 3

2.1.2 Resistance measurement ································································ 4

2.1.3 Measuring voltage output ································································ 4

2.2 Functional Specification····································································· 4

2.2.1 Measuring time setting···································································· 4

2.2.2 Voltage monitoring (Voltage check) ··················································· 4

2.2.3 Contact check function ···································································· 4

2.2.4 Self-calibration function and self-di agnosis function ······························ 5

2.2.5

Comparison measurement and deviation/percent measurement functions

··········· 5

2.2.6 Measurement (jig setting and da ta processi ng) f unction ························· 5

2.2.7 Measuring sequence program ·························································· 6

2.2.8 Storage and display functions of measured data··································· 6

2.2.9 Operability and display····································································6

2.2.10 Resume function·········································································· 6

2.2.11 Input and output functions (e xternal con trol i nterfaces) ························· 7

2.3 General Specifications ······································································8

2.4 Options·························································································· 8

2.4.1 Special options··················································································9

2.4.2 Common options················································································9

3. Operating Principles

3.1 Operating Principles ······································································· 10

3.2 Block Diagram of DSM-8542····························································· 11

4. Names and Functions of Components

4.1 Safety Alert Symbols······································································· 12

4.2 Front Panel··················································································· 13

4.3 Rear Panel ··················································································· 16

4.4 Command/Numeric Input Keys·························································· 17

4.5 Display Screen ·············································································· 20

5. Preparations for Measurement

5.1 Connecting Meter and Power Supply Unit············································ 22

5.1.1 Connecting dedicated power supply unit PSU8541 ····························· 22

5.1.2 Connecting power supply other than dedicated power supply unit ·········· 22

5.2 Setting Measuring Conditions ··························································· 25

5.2.1 Screen types ·············································································· 27

5.2.2 Setting measuring mode································································ 33

5.2.3 Setting measuring voltage ····························································· 34

5.2.4 Setting current limiter ··································································· 35

5.2.5 Setting measuring range ······························································· 36

5.2.6 Setting integral time (sam pli ng tim e) ················································ 37

5.2.7 Setting averaging function ····························································· 38

5.2.8 Setting trigger mode····································································· 38

5.2.9 Creating a program ······································································ 39

5.2.10 Setting measured data buffer function ············································ 41

5.2.11 Setting operating environment ······················································ 43

5.2.12 Executing self-diagnostic function ([SETUP], SELF) ·························· 43

5.2.13 Self-calibration setting································································· 44

5.2.14 Setting measuring voltage source ([SETUP], POW R)························· 45

5.2.15 Setting high-speed measuring mode ([SETUP], FAST)······················· 47

5.2.16 Setting interface conditions ·························································· 47

5.3 Display and Processing of Measured Value ········································· 50

5.3.1 Displaying measured value ···························································· 50

5.3.2 Comparison measurement····························································· 51

5.3.3 Deviation display ········································································· 52

5.3.4 Creating histogram······································································· 53

6. Measurement

6.1 Functions of and Connecting Measuring Term inals································ 56

6.1.1 Functions of measuring terminals···················································· 56

6.1.2 Connecting measuring terminals ····················································· 57

6.2 Measuring Parts, Circuits and Other Items··········································· 57

6.2.1 Using measuring jigs ···································································· 57

6.2.2 Auto measurement······································································· 59

6.2.3 When measuring j ig is not used ······················································ 61

6.2.4 Measurement of circuits ································································ 62

6.3 Measuring Planar Sample ································································ 62

6.3.1 Measurement by pin terminal ························································· 62

6.3.2 Measurement by electrode for surface resist ance measurement ············ 63

6.3.3 Measurement by electrode for planar samp le····································· 63

6.3.4 Use of shielding box····································································· 65

6.4 Measuring Liquid Sample································································· 67

6.4.1 Measurement by electrode for liquid sampl e······································ 67

6.5 Current Measurement ····································································· 69

6.6 Ending Measurement ······································································ 70

6.7 Measurement Check······································································· 70

6.7.1 Voltage check············································································· 70

6.7.2 Contact check············································································· 71

7. GP-IB Interface

7.1 Overview······················································································ 73

7.2 Specification ················································································· 73

7.3 Talker Function·············································································· 74

7.4 Response to Query Program Message ················································ 76

7.5 Listener Function ··········································································· 77

7.6 Device Clear Function····································································· 78

7.7 Device Trigger Function··································································· 78

7.8 Remote and Local Functions ···························································· 78

7.9 Program Messages········································································· 82

7.9.1 List of program messages······························································ 82

7.10 Precautions for Listener Specific ation ··············································· 95

7.10.1 Input buffer size········································································· 95

7.10.2 Input command message execute and message accept ····················· 95

7.10.3 Command parameter trouble ························································ 95

7.10.4 Limit on command message execute·············································· 95

7.10.5 Output buffer readout·································································· 95

7.11 Status Byte and Events·································································· 96

7.12 Status Data ················································································· 97

7.13 Status Byte Register ····································································· 98

7.14 Using Program Message·······························································100

7.15 Standard Event Status Register······················································103

7.16 Error Register·············································································105

7.17 Device Event Status Register·························································107

7.18 Initialization Value by *RST Message···············································109

8. RS-232 Interface

8.1 Overview·····················································································111

8.2 Connector Used and Signal Names···················································111

8.3 Changeover to GP-IB·····································································111

8.4 Connecting Control Signals and Flow Control······································111

8.5 Transmission Data Specification·······················································112

8.6 Reception Data Specification···························································113

8.7 Status Byte and Events ··································································113

9. External Interfaces

9.1 Handler Interface ··········································································114

9.1.1 Connector·················································································114

9.1.2 Signal functions ··········································································115

9.1.3 Electrical characteristics of signal s ·················································117

9.2 External Trigger Terminal································································119

9.2.1 Connector·················································································119

9.2.2 Electrical characteristics ·······························································119

9.3 Interlock Terminal ·········································································120

9.3.1 Connector·················································································120

9.3.2 Electrical characteristics ·······························································120

9.4 Signal Timing ···············································································121

9.5 PSU-8541 Connectors····································································123

10. Maintenance

10.1 Periodical Checks for Maintenance ··················································124

10.2 Calibration ·················································································124

10.2.1 Equipment needed for calibration ·················································124

10.2.2 Calibration of measuring voltage ··················································124

10.2.3 Calibration of current meas urement ··············································124

10.3 Self-calibration Function································································125

10.4 Self-diagnosis Function·································································126

10.5 Service Organization of HIOKI························································127

10.6 Storage and Moving ·····································································127

11. Product Full View ········································································128

1. Preparations Before Operation

1.1 Check during Uncrating This product has been inspected carefully at the HIOKI factory in preshipment inspection.

Nevertheless, check the following items when uncrating the crate.

1) Any damage on the exteriors of the product.

2) Quantities of accessories Check in accordance with Table 1.1 List of Accessories.

Table 1.1 List of Accessories

Item Quantity Remarks

Power cable 1 Power cable with three poles and grounding pin 3P-2P

conversion adapter

1 Changes the 3P plug of the power cable to a 2P plug

Operational manual 1 This manual

If any damage or missing accessory is found, please contact our distributor or sales office near your location.

1.2 Operating Power Supply This meter is powered by the following power supply.

Power supply voltage

100V ±10%

Change in power supply voltage Factory option other than 100V (115, 220 or 240V)

Dedicated power supply unit PSU8541 is rated to 100V only

Power supply frequency 50/60Hz

[Warning]

Before connecting the power plug, check that the AC power supply voltage to be used matches the voltage specified on the rear panel. If they do not match, a fire or damage to the meter may result.

[Caution]

Use a 3-conductor power cable conforming to the power supply voltage. A 100V power cable is supplied wi th the meter as an accessory. Do not use this accessory cable with other el ectric equipme nt.

1.3 Grounding Be certain to ground the grounding terminal located on the rear of the meter or the

grounding pin of the power cable to prevent an accident such as an electrical shock. The round pin of the 3P plug attached to the power cable is the grounding pin. Plug the cable to a plug socket that has a grounding device. When using the 3P- 2P conver sion adapter, be certain to ground the grounding lead wire from the adapter or the grounding terminal located on the rear of the meter.

[Warning]

Be certain to ground the grounding pin of the power cable to prevent an accident. If the grounding pin of the power cable cannot be grounded, be certain to ground the grounding terminal located on the rear of the meter.

1.4 Measuring Cable

1) Low-noise cable This meter measures a current at a high sensitivity and measured values sometimes

are not stable due to noise generated by the measuring cable. Use low-noise shielded-conductor cable meeting the specification of HIOKI.

2) Limited length of measuring cable Depending on the length of the measuring cable, adjustment of the meter is

necessary to correct open values in the contact check function. The meter was adjusted for use of the measuring cable in the length of 1m during preshipment inspection of the meter by HIOKI. Please contact our distributor or sales office near your location if other cable length is intended to be used.

1.5 Warming Up Time Warm up the meter more than 30 minutes before operating the meter to obtain the

specified performance.

1.6 Memory Initializing

• Memory initializing

1) Press the [F3] key. If the screen is displayed, the key is in the SAVE Function mode. The key can

perform its function even if the key is not displayed.

2) Press the [MAN. T] (-) key.

3) Press the [ENTER] key. This completes memory initialization. The memory can be initialized by this method anytime as long as the meter is shut

down. However, memory initialization also automatically clears data saved by the save function.

Memory initialization will set the values that were set during preshipment inspection

at the HIOKI factory shown in Table 7.9 “Settings by Factory Preshipment Inspection and Values Initialized by Message.”

2 Specification

2.1 Measurement Performance Measuring Channels

Measuring Channels 4 channels simultaneous measurement Measuring input/output terminal [INPUT]

Measurement input [O UTPUT] Voltage output [A(-), B(-)] Voltage input [CH1 (+), CH2 (+), CH3 (+), CH4 (+)]

Channel separation Common connection between CH1 and CH2

2.1.1 DC current measurement

Measuring

Range

10 pA

100 pA

1 nA

10 nA

100 nA

1 µA

10 µA

100 µA

1) Measuring time Typically 300ms with averaging process ON.

2) Temperature range 23 ±5°C, humidity 85% or less

3) Mode Self-calibration automatically executed at 1 minute interval

4) Averaging process On

Maximum Indicati on

9.9999 pA

99.999 pA

999.99 pA

9.9999 nA

99.999 nA

999.99 nA

9.9999 µA

99.999 µA

4 channels front panel (Input connector for insulation resistance meter to HIOKI specification) 4 channels front panel (Binding post) 2 channels rear panel (multi connector) 4 channels rear panel (multi connector) 4 channels rear panel (multi connector)

Common connection between CH3 and CH4 Separated between CH1 and CH2 and between CH3 and CH4

Current Measurement

Resolution Accuracy

0.1 fA

1.0 fA 10 fA 100 fA

1 pA 10 pA 100 pA

1 nA

± (3.0% of rdg + 1.2% of range) ± (1.5% of rdg + 0.6% of range) ± (0.6% of rdg + 0.6% of range) ± (0.4% of rdg + 0.5% of range) ± (0.4% of rdg + 0.5% of range) ± (0.4% of rdg + 0.5% of range) ± (0.4% of rdg + 0.5% of range) ± (0.4% of rdg + 0.5% of range)

[Remarks]

The resistance measurement accuracy greatly affects the accuracies of voltage impressed and of current measured. The DSM-8542 specifies only the current accuracy as a specification. The resistance accuracy is calculated by the following formula assuming current measurement is a full-scale value. Normally, measured currents are lower than currents on a full scale and “resistance accuracy > current accuracy” is a normal val ue.

Resistance accuracy = Current accuracy +

(Resistance on full-scale current)

(On full-scale current)

Voltage accuracy Accu racy

2.1.2 Measuring voltage output The output is determined by voltage and current of the power supply input from the rear panel.

1) Complies with 2.5 “Specification for Dedicated Power Supply Unit PSU-8541” when the dedicated power supply unit PSU-8541 is used.

2) The screen for operation of the DSM8542 is programmed assuming PSU-8541 will be used.

2.2 Functional Specification

2.2.1 Measuring time setting

Delay Time Sampling time setting

Power period setting

0 ～ 9999 ms 2 ～ 300ms 1 ～ 15 PLC

Averaging cycles Auto setting

2.2.2 Voltage monitoring (Voltage check)

Voltage that is output is measured and is compared with the set voltage. Any deviation from the specified range is indicated by flashing of the side mark (V.CHK ON display).

2.2.3 Contact check function

Connection of a work is checked by measuring the capacity by an RF signal and contact is checked by a difference between contact in an open circuit state. Non-contact is indicated by flashing of the side mark (C.CHK ON display).

Item Remarks

Capacity range allowed for contact detection

Minimum 0.5pF. More than 1/10 of capacity on jig side.

Capacity offset range on jig side Max. 100pF (0.1pF resolution)

[Notice ] This specification is for a measuring cable length of 1m. Readjustment is needed if the length exceeds 1m. This function cannot be used if the measuring cable length exce eds 2m.

2.2.4 Self-calibration function and self-diagnosis function

The self-calibration function and self-diagnosis function are executed by keying the Execute key or by the Execute command from the interface. Self-calibration can be executed automatically after setting an interval. Self-diagnosis is executed automatically when the power is turned on.

Execution items:

Self-calibration: A/D converter calibration and calibration of current range for each set

period (can be executed automatically)

Self-diagnosis: A/D converter calibration, self calibration of current range and

memory check of the control computer

2.2.5 Comparison measurement and deviation/percent measurement functions

Comparison measurement display: “NG” in decision results is indicated by flashing of the side mark . An alarm is sounded by a beep tone (GO decision or NO-GO decision). Deviation/percent measurement display: The unit is indicated by % or in a measuring mode during measurement. Reference values can be set within whole measuring ranges.

Description

Comparison method Upper-limit comparison HI GO:

Measured value > upper-limit value

Intermediate comparison IN GO:

Upper-limit value ≥ measured value ≥ lo wer-limit value

Lower-limit comparison LO GO:

Upper-limit value > measured value

Calculation method for

(Measured value - reference value) x 100/reference value Percent Measuring mode Calculation method for

Measured value - reference value Deviation Measuring m ode

2.2.6 Measurement (jig setting and data processing) function Measurement of surface resistivity and volume resistivity. Surface resistivity and volume resistivity can be measured directly by setting a constant for a jig (or an electrode). Set items

Surface resistivity measurement: Outside diameter of inner electrode and inside

diameter of outer electr ode

Volume resistivity measurement: Outside diameter of inner electrode and thickness of

sample

Any electrode constant can be set directly.

2.2.7 Measuring sequence program Up to ten measuring sequence patterns of discharge, charge, measurement and discharge can be programmed.

Description Program sequence (1) Discharge 1, (2) charge, (3) measurement (4) discharge 2 Settable patterns 10 Set time range 0.0 ~ 999.9s

2.2.8 Storage and display functions of measured data (1) Measured data buffer

Measured data up to 1000 data groups for four individual channels is sequentially stored and displayed by scrolling. Measured data is sequentially stored and up to 1000 most recent data groups are displayed on the stored measurement data screen. Note: Stored data is cleared when the power is shut down.

(2) Histogram counter

Measured values are classified according to thresholds set independently for the four channels and the numbers of samples falling in threshold ranges are displayed in a bar graph. Measured values are classified into ten types and numbers of data groups are stored by digitally counting them by a counter. Thresholds are set for the individual measuring modes and are indicated on the screen in a bar graph. Thresholds are set within the measuring range

2.2.9 Operability and display (1) Keyboard

Rubber key switches Key clicking tone on or off can be selected Key lock (prevention of malfunction in the Remote mode) on or off can be selected

(2) Displays

1) Liquid crystal display 240x64dot graphic LCD (30 columns, 8 rows) Backlight (Yellowish green LEDs)

Character size

Measured result 4 x 2 size

Measuring conditions Full size Bar graph display

2) High-voltage warning display Red LED lit if higher than about 30V

2.2.10 Resume function

When the po wer sup ply goes off, th e set p aramete rs are au tomati cally s tored. When t he power is turned on again, the operation is resumed at the set parameters that are automatically stored, except the voltage impression state.

2.2.11 Input and output functions (external control interfaces) (1) GP-IB interface

All items that are operated on the panel can be GP-IB controlled. Measured results comprising 5-digit exponential measured values, comparison results and check of measured state are sent in one line of data strings. Responses in 4-digit fixed decimal points or 5-digit integers are sent to query commands.

(2) Specification of RS-232 interface function

All items that are operated on the panel can be RS-232C controlled. Measured results comprising 5-digit exponential measured values, comparison results and check of measured state are sent in one line of data strings. Responses in 4-digit fixed decimal points or 5-digit integers are sent to query commands.

(3) Specification of handler interface function

The interface for measurement by directly operating the meter using the handler used in measurement. The communication items and electrical specification are as follows.

• Communication items Opening and closing of shielding box, key lock of front panel keys, contact start, measurement start, contact check start, contact check result measuring voltage on and off, decision results, analog measurement end measurement computing end, troubles that have occurred.

• Electrical specification Contact input and output by a photocoupler Connector product No. is 57LE-40360-7700

4) Specification of interface function for control of dedicated power supply unit PSU-8541 Using the dedicated power supply unit PSU-8541, insulation resistance can be measured operating the DSM8542. Voltage and current can be set and voltage ON/OFF can be selected. The control items are as follows.

Voltage setting Current limiter for measurement and current value setting (Common for all channels) Current limiter for charging and current value setting (Common for all channels) Voltage output ON/OFF Voltage generator filter ON/OFF

2.3 General Specifications

General Specifications

HIOKI-specification insulation meter input connector (INPUT) Red binding post (OUTPUT)

Operating environment

Temperature 5 to 35°C, humidity 85% or less

Power supply voltage

AC 100V ±10% (standard), 115/220/240V ±10% (factory option) AC 100V ±10% (dedicated power supply unit PSU-8541 )

Power supply frequency

50／60Hz

Power consumption

55VA max. 350BVAmax (dedicated power supply unit PSU-8541)

External dimensions (mm)

332 W x 89 H x 450 D 332 W x 179 H x 450 D (dedicated power supply unit PSU-8541)

Weight

7kg 28kg (dedicated power supply unit PSU-8541)

2.4 Options In addition to the standard accessories , the following products are available as options for dedicated use with this meter for easy and expanded uses of the meter and as options that are common to the meters manufactured by HIOKI.

2.4.1 Special options The special options for dedicated use with this meter are as follows.

Option Product Name Standard

Measuring lead with te st rod 0GE00002

0GE00001

Measuring lead with alligator clip 0GA00007

0GA00008

Length 1m, red Length 1m, black Length 1m, red Length 1m, black

Interlock connection cable DSM8104F Length 0.1m

2.4.2 Common options The options common to all HIOKI insulation meters are as follows.

Option Product Name Remarks

Electrode for planar sample (The main electrode dia. is 50mm)

SME-8310 Equipped with changeover switch for

surface and volume resistance measurement Comes with interlock connecting cable*

Electrode for planar sample

SME-8311 Same as above*

(The main electrode dia. is

19.6 mm ) Weight Electrode SME-8320 For surface and volume resistance

measurement (Designed for use with SME-8350 Shielding Box)

Shielding Box SME-8350 Measurement box for shielding dielectric

interference*

Surface Resistance

SME-8301 For anti-electrostatic product Measurement Electrode Surface Resistance Measurement Electrode

SME-8302 For rubber and plastics

(Electrode spacing 10mm)

Liquid Sample Electro de SM-8330 Capacity about 25ml, electrode constant

about 500cm Electrode for chip capacitor SME-8360 For chip capacitor Surface/Volume Resistance Measurement Electrode

SM9001 Surface/Volume Resistance

measurement for static prevention floor

material Standard Resistor SR-2 Calibrating standard resistor for super

insulator meter

*When connecting this meter to an electrode for planar sample (SME-8310 or SME-8311) or a shielding box (SME-8350), the interlock connecting cable (DSM8104F) is necessary.

3 Operating Principles

3.1 Operating Principles

Equipped with four channels of high-sensitivity current measuring units, this meter calculates an insulation resistance value based on measuring voltage set in a dedicated voltage source and impressed to the work and measured current value. The meter also outputs a current value and can be used also as a 4-channel high-sensitivity ammeter in addition to its use as an insulation resistance meter. The control unit of the meter has a 32bit CPU for calculations of resistance values and for other functions. Current-voltage conversion of the current measuring unit is based on a current-voltage conversion A/D converter of a charge measuring type that integrates input current. The output of the current-voltage converter is converted into digital data by an A/D converter and is fed to the memory in the control unit after being isolated by a photoisolator. The control unit computes measured data input to the memory and outputs it to the display screen and interf aces. The measuring voltage source can be set 1000V/10mA maximum and supplies stable measuring voltage from the dedicated power supply unit. The dedicated external measuring voltage source of this meter can set a large maximum output current, allowing simultaneous measurement of up to four channels so that measuring time can be shortened in measuring a sample with a large electrostatic capacity such as a capacitor by shortening the charging time. In addition to voltage output for measurement, the dedicated external measuring voltage source has voltage output for charging (charging terminal), which can be used for precharging before taking measurement, to enhance the measuring throughput. The measuring voltage output and charge output are separated by a current limiter, enabling continual measurement without affecting measurement even if a sample on the charge terminal side is short-circuited. An isolated handler interface that can be connected directly to a contact signal, a GP-IB interface conforming to the IEEE-488 standard and an RS-232 and an interface for control of the dedicated voltage source are available as external interf aces that are supplied as standard provisions. For measurement connectivity, two channels each measuring circuits are floating. Both grounded samples and non-grounded samples can be measured. The meter can be used as an independent ammeter by measuring a current between the “INPUT” and “GUARD” terminals. In this case, however, measuring voltage is output on start of measurement and a minimum value needs be set as measuring voltage.

3.2 Block Diagram of DSM-8542

4 Names and Functions of Components

[Notice ]

In the following descriptions, characters enclosed by “[ ]” such as [ENTER] are the characters printed on key tops. Characters enclosed by “ ” such as “POWER” are the characters printed on the panels.

4.1 Safety Alert Symbols

The following safety alert symbols are placed on the front and rear panels of this meter.

！

The locations where the safety alert symbols are placed are illustrated below.

Warning symbol

Electrical

Grounding terminal

This symbol is marked where the operational manual needs to be referred to.

This symbol indicates high voltage hazard and is indicated on terminals where high voltage is output such as meas uring t erminal s.

Indicated on the grounding terminal “GND” on the rear of the meter. If the grounding pin of the power cable cannot be grounded, be certain to ground this terminal.

4.2 Front Panel

The front panel of the DSM-8542 is illustrated below.

1: “POWER” switch

The power supply switch to select power on and off. Press this switch once to depress it to turn the power on. Press once again to pull up the key and to turn the power off.

2: “POWER” lamp

Lit when the POWER switch is turned on.

3: “STOP” lamp

Lit when the [STOP] key is pressed. Extinguished when the [START] key is pressed. The output voltage lowers to “0” while the “STOP” lamp is lit, disabling receiving of trigger input.

4: “START” lamp

Pressing the [START] key lights up this lamp, going off when the [STOP] key is pressed. The set voltage is output and trigger input can be received while the “START” lamp is lit.

5: [STOP] key

Stops measurement and lowers voltage output to 0V. This key is given the highest priority and can be operated even when the keys are locked .

6: [START] key

This key outputs set voltage and enables trigger input. Measurement is started when the Trigger mode is “INT.”

7: “High Voltage” lamp

Indicates output of high voltage. The lamp is lit when voltage higher than about 30V is output.

8: Cursor moving keys

The keys move the cursor around on the screen or scroll the screen.

9: Command/numeric input keys

Operate the keys when setting parameters. Pressing the [SHIFT] key changes the keys to the numeric input keys.

10: [F1]/“TRIG MODE” [F2]/“COMP ON /FF” [F3]/“V. CHK ON/OFF ” [F4]/“C . CHK ON/FF” [F5]/“P.SET”

These keys are the functi on keys. The functions of these keys are displayed on the LCD screen above the keys. Pressing the [SHIFT] key on the measurement screen sets the functions indicated in “ .” The information is displayed on the screen also.

11: Display

This is a liquid crystal display module 240 x 64 dots in resolution to display measured results, measuring conditions and various setting screens.

12: “INPUT” connector [CH1]

The connector for measurement input. The connector of a double structure comprising a center conductor and outer conductor connecting to measurement input and to the “CH1&CH2” of the “VOLTAGE INPUT” connector on the rear, respectively. The connector has a floating potential common with CH2.

13: “INPUT” terminal [CH2]

The connector for measurement input. The connector of a double structure comprising a center conductor and outer conductor connecting to measurement input and to the “CH3&CH4” of the “VOLTAGE INPUT” connector on the rear, respectively. The connector has a floating potential common with CH1.

14: “INPUT” terminal [CH3]

15: “INPUT” terminal [CH4]

16: “OUTPUT” termin al [CH1]

A terminal for measuring voltage output. Resistance is measured between the “OUTPUT” [CH1] and “INPUT” [CH1] terminals. It is connected to “OUTPUT” te rminal [CH2].

17: “OUTPUT” termin al [CH2]

A terminal for measuring voltage output. Resistance is measured between the “OUTPUT” [CH2] and “INPUT” [CH2] terminals. It is connected to “OUTPUT” te rminal [CH1].

18: “OUTPUT” termin al [CH3]

A terminal for measuring voltage output. Resistance is measured between the “OUTPUT” [CH3] and “INPUT” [CH3] terminals. It is connected to “OUTPUT” te rminal [CH4].

19: “OUTPUT” termin al [CH4]

A terminal for measuring voltage output. Resistance is measured between the “OUTPUT” [CH4] and “INPUT” [CH4] terminals. It is connected to “OUTPUT” te rminal [CH3].

4.3 Rear Panel

The rear panel of the DSM-8542 is illustrated below.

20: “AC LINE 50/60Hz” connector

The connector for input of power supply voltage.

21: “VOLTAGE INPUT” connector

The connector to supply voltage needed for insulation resistance measurement. Supplies voltage to both [CH1&CH2] and [CH3&CH4].

22: “RS-232” connector

The connector for RS-232 connection.

23: “GP-IB” connector

The connector for GP-IB connection.

24: “EXT TRIGGER” connec tor

The connector for external trigger input. This connector is used when the trigger mode is set to external “EXT.”

25: “INTERL OCK” conn ector

The input connector for connection of signals from a fixture when an interlock function is used.

26: “GND” terminal

The grounding terminal connected to the housing of the meter.

27: Cooling fan

The fan for cooling the inside of the meter.

28: “HANDLER” connector

The connector for handler connection.

29: “V.CONTROL” connector

The connector to connect control signals when the dedicated power supply unit PSU-8541 is used.

4.4 Command/Numeric Input Keys

The command/numeric input keys have the following functions:

[SHIFT]: Shift

The key to change command/numeric input and the functions of the function keys on the measurement screen. The command/numeric input keys are set to the Command Input mode when the [SHIFT] key is not pressed, set to the Numeric Input mode when the [SHIFT] key is pressed. Each pressing of the [SHIFT] key alternately changes the mode of the key. When the SH IFT key i s pres sed, a s ide ma rk (“◄”) will be displayed beside “SHIFT” in the upper right of the screen.

[ENTER]: Enter

Pressing this key enters input results. Exit after finishing setting the measurement screen and the setting screen by pressing this key.

[LOCK]/”0”: Key lock

Press this key to prohibit key input. Pressing this key prohibits operations of the keys other than the [STOP] and [LOCK] keys. Press the [LOCK] key again to cancel the key lock status. When the ke ys are lo cked, a side m ark (“ ◄”) will be displayed beside “KEY LOCK” in the upper left of the screen. The key becomes a key for input of “0” when the [SHIFT] key is pressed and the Numeric Input mode is set.

[LCDOF]/“.”: LCD off

The key to exit the display screen. The key shuts down screen display and extinguis hes the backli ght. Press any key to cancel when the display is turned off. The key becomes a decimal point input key “.” in the Numeric Input mode.

[MAN.T]/“-”: Manual trigger

A trigger is generated and measurement is started when pressed while the trigger mode is “MAN” (Manual Trigger mode). When in the Numeric I nput mode, the key will become a negative “-” po larity input key.

７

MONI

MOD

PROG

０

LOCK

８

COMP

ELEC5SETUP

OPEN

LCDOF

９

DATA

V.CHK

MAN.T

SHIFT

LOCAL

C.CHK

ENTER

MONI

MOD

PROG

０

LOCK

[PROG]/“1”: Program

The key to move to the sequence program creation screen. See “Operating Program Creation Screen.” When in the Numeric I nput mode , the key wi ll become an input key (“ 1”).

[OPEN]/“2”: Open correction

The key to move to the screen to set reference values for contact checks. See “Operating Open Setting Screen.” When in the Numeric I nput mode , the key wi ll become an input key (“ 2”).

[V. CHK]/“3”: Voltage check

The key to execute once a voltage check of measuring voltage output between “OUTPUT” and “GUARD.” When in the Numeric I nput mode , the key wi ll become an input key (“ 3”).

[C. CHK]/“BS”: Contact check

The key to execute once a contact check. When in the Numeric I nput mode , the key wi ll become a “BS” k ey to dele te characters that are input.

[∆MOD]/“4”: Deviation Measuring m ode

The key to move to the Deviation Value Display and Setting screen. See “Operating Deviation Value Display and Setting Screen.” When in the Numeric I nput mode , the key wi ll become an input key (“ 4”).

[ELEC]/“5”: Electrode

The key to move to the Electrode Parameter Setting screen. See “Operating Electrode Setting Screen.” When in the Numeric I nput mode , the key wi ll become an input key (“ 5”).

[SETUP]/“6”: Set up

The key to move to the Operation Environment Setting screen. See “Operating Operation Environment Setting Screen.” When in the Numeric I nput mode , the key wi ll become an input key (“ 6”).

[LOCAL]/“E”: Local

The key to cancel the Remote mo de. When in the Numeric I nput mode , the key wi ll become an exponent display and input key (“E”).

COMP

ELEC

OPEN

LCDOF

DATA

SETUP

V.CHK

MAN.T

SHIFT

LOCAL

C.CHK

ENTER

[MONI]/“7”: Monitoring

The key to change over the Regular Measurement screen and Sequential Measurement monitoring screen. When in the Numeric I nput mode , the key wi ll become an input key (“ 7”).

[COMP]/“8”: Compare

The key to move to the Comparison Measurement Setting screen. When in the Numeric I nput mode , the key wi ll become an input key (“ 8”).

[DATA]/“9”: Data

The key to move to the acquired data screen to total measured results. When in the Numeric I nput mode , the key wi ll become an input key (“ 9”).

MONI

MOD

PROG

０

LOCK

COMP

ELEC

OPEN

LCDOF

DATA9SHIFT

SETUP

V.CHK

MAN.T

LOCAL

C.CHK

ENTER

4.5 Display Screen

The display screen of the DSM-8542 is illustrated below.

“REMOTE”

When in th e Remote mode (GP -IB or RS -232 mode ), a sid e mark ( “◄”) will be displayed on the screen. The Remote mode is not set when the side mark is not displayed.

“KEY LOCK”

When in th e Key Lo ck mod e, a sid e mark (“◄”) will be displayed on the screen. The Key Lock mode is not set when the side mark is not displayed.

“INTERLOCK”

When the i nterlock fun ction i s on (en abled) , a side mark (“ ◄”) will be displayed on the screen. The interlock function is off (disabled) when the side mark is not displayed.

“BUFF. FULL”

A side mark (“◄”) will be lit when the number of data groups saved by the buffering function for 1000 data groups exceeds 1000. Measured data after this mark is lit will be discarded without being stored in the buffer.

“CHARGE ON”

A side mark (“◄”) will be lit when the [CHARGE] terminal is usable. The [CHARGE] terminal cannot be used when this mark is not lit.

“OPEN SET”

A side mark (“◄”) will be lit when open correction is executed. A contact check can be carried out while this mark is displayed. Executing a contact check when this mark is not displayed results in an error.

“MEAS COND”

A side mark (“•”) on the screen indicates that the meter is conducting measurement.

“SHIFT”

A side mark (“►”) on th e screen indicates the status of the Shift ke y. The Shift mode is not set while the side mark is not displayed.

+ 110 hidden pages

Hioki DSM-8542 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual