INSTRUCTION MANUAL
DSM-8104
DIGITAL SUPER
MEGOHMMETER
April 2013 Revised edition 1 DS8104A981-01 13-04H
Preface
Thank you for purchasing the DSM-8104 and welcome to the growing family of HIOKI’s
Digital Super Megohm Meters/Current Meters.
The DSM-8104 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 thorou ghly 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-8104 is an insulation resistance meter
embedded with a low-noise voltage source and 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.
The meter is suitable for measuring insulation resistance of insulating materials with a
large capacity thanks to the low-noise voltage source embedded in the meter.
A liquid crystal display module (240 x 64 dots) of the meter allows easy viewing of
needed information and ease of use.
Principal Features
3
to 3 x 1016Ω and a
Measurable voltage range : 0.1 to 1000V
Measurable current range : 30fA to 10mA
3
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 function : 2ms to 300ms
Trigger delay setting function : 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
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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 operationa l
instructions.
[Warning]
Indicates a potentially hazardous situation that 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 that could result in equipment damage.
Operate the meter exercising reasonable caution.
[Notice]
Indicates an important item in operation.
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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.
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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.
This symbol indicates high voltage hazard and is
indicated on terminals where high voltage is output
such as measuring terminals.
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.
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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 Initializing·························································································2
2. Specification
2.1 Measurement Performance············································································ 3
2.1.1 DC current measurement ············································································ 3
2.1.2 Resistance measurement ···········································································3
2.1.3 Measuring voltage output ···········································································4
2.2 Functional Specification················································································· 4
2.2.1 Measuring time··························································································· 4
2.2.2 Voltage monitoring (Voltage check) ···························································· 4
2.2.3 Contact check function ···············································································4
2.2.4 Self-calibration function and s elf-diagnosis function···································· 5
2.2.5
Comparison measurement and deviation/percent measurement functions
2.2.6 Measurement (jig setting and data processing) function ······························ 5
2.2.7 Measuring sequence program·····································································5
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 (external control interf aces )·····························6
2.3 General Specifications ··················································································· 7
2.4 Options··········································································································8
2.4.1 Special options···························································································8
2.4.2 Common options ························································································ 8
3. Operating Principles
3.1 Operating Principles······················································································9
3.2 Block Diagram·····························································································10
4. Names and Functions of Components
4.1 Safety Alert Symbols ··················································································· 11
4.2 Front Panel ································································································· 12
4.3 Rear Panel··································································································14
4.4 Command/Numeric Input Keys ····································································15
4.5 Display Screen····························································································18
·············5
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5. Preparations for Measurement
5.1 Setting Measuring Conditions······································································20
5.1.1 Screen types ···························································································· 22
5.1.2 Setting measuring mode ··········································································· 28
5.1.3 Setting measuring voltage········································································ 28
5.1.4 Setting current limiter ··············································································· 29
5.1.5 Setting measuring range ·········································································· 30
5.1.6 Setting integral time (sampling time) ························································· 31
5.1.7 Setting averaging function········································································ 32
5.1.8 Setting trigger mode················································································· 32
5.1.9 Creating a program ·················································································· 33
5.1.10 Setting measured data buffer function ···················································· 35
5.1.11 Setting operating environment································································37
5.1.12 Setting other items ················································································· 38
5.2 Display and Processing of Measured Value·················································40
5.2.1 Displaying measured value······································································· 40
5.2.2 Comparison measurement········································································ 42
5.2.3 Deviation display······················································································ 43
5.2.4 Creating histogram··················································································· 44
6. Measurement
6.1 Functions of and Connecting Measuring Terminals······································ 47
6.1.1 Functions of measuring terminals····························································· 47
6.1.2 Connecting measuring terminals ······························································ 48
6.2 Measuring Parts and Circuits······································································· 50
6.2.1 Using measuring jigs ················································································ 50
6.2.2 Auto measurement ··················································································· 52
6.2.3 When measuring jig is not used································································ 54
6.2.4 Measurement of circuits ··········································································· 55
6.3 Measuring Planar Sample ··········································································· 55
6.3.1 Measurement by pin terminal···································································· 55
6.3.2 Measurement by electrode for surface resistance measurement···············56
6.3.3 Measurement by electrode for planar sample ··········································· 56
6.3.4 Use of shielding box················································································· 58
6.4 Measuring Liquid Sample············································································ 60
6.4.1 Measurement by electrode for liquid sample············································· 60
6.5 Current Measurement·················································································· 62
6.6 Ending Measurement ·················································································· 62
6.7 Measurement Check ··················································································· 63
6.7.1 Voltage check··························································································· 63
6.7.2 Contact check ·························································································· 63
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7. GP-IB Interface
7.1 Overview····································································································· 66
7.2 Specification ································································································ 66
7.3 Talker Function ··························································································· 67
7.4 Response to Query Program Message ························································ 68
7.5 Listener Function ························································································· 69
7.6 Device Clear Function ················································································· 70
7.7 Device Trigger Function ·············································································· 70
7.8 Remote and Local Functions ······································································· 71
7.9 Program Messages······················································································ 75
7.9.1 List of program messages········································································· 75
7.10 Precautions for Listener Specification························································ 88
7.10.1 Input buffer size······················································································ 88
7.10.2 Input command message execute and message accept·························· 88
7.10.3 Command parameter trouble ·································································· 88
7.10.4 Limit on command message execute ······················································ 88
7.10.5 Output buffer readout ············································································· 88
7.11 Status Byte and Events ············································································· 89
7.12 Status Data ······························································································· 90
7.13 Status Byte Register·················································································· 91
7.14 Using Program Message ···········································································93
7.15 Standard Event Status Register································································· 96
7.16 Error Register···························································································· 98
7.17 Device Event Status Register ·································································· 100
7.18 Initialization Value by *RST Message ······················································ 102
8. RS-232 Interface
8.1 Overview··································································································· 104
8.2 Connector Used and Signal Names··························································· 104
8.3 Changeover to GP-IB ················································································ 104
8.4 Connecting Control Signals and Flow Control············································ 104
8.5 Transmission Data Specification································································ 105
8.6 Reception Data Specification····································································· 106
8.7 Status Byte and Events ············································································· 106
9. External Interface
9.1 Handler Interface······················································································· 107
9.1.1 Handler Interface···················································································· 107
9.1.2 Signal functions······················································································ 108
9.1.3 Electrical characteristics of signals ························································· 110
9.2 External Trigger Terminal·········································································· 112
9.2.1 Connector······························································································· 112
9.2.2 Electrical characteristics········································································· 112
9.3 Interlock Terminal······················································································ 113
9.3.1 Connector······························································································· 113
9.3.2 Electrical characteristics········································································· 113
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9.4 Signal Timing ···························································································· 114
10. Maintenance
10.1 Periodical Checks for Maintenance·························································· 116
10.2 Calibration······························································································· 116
10.2.1 Equipment needed for calibration ························································· 116
10.2.2 Calibration of measuring voltage ·························································· 116
10.2.3 Calibration of current measurement······················································ 116
10.3 Self-calibration Function·········································································· 117
10.4 Self-diagnosis Function··········································································· 118
10.5 Service Organization of HIOKI································································· 119
10.6 Storage and Moving ················································································ 119
11. Product Full View·······················································································120
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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
3P-2P
conversion
adapter
Operational
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)
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.
1
1 This manual
Power cable with three poles
and grounding pin
Changes the 3P plug of the
power cable to a 2P plug
[Caution]
Use a 3-conductor power cable conforming to the power supply voltage. A 100V
power cable is supplied with the meter as an accessory. Do not use this accessory
cable with other electric equipment.
1
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-conversion 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
2 Specification
2.1 Measurement Performance
2.1.1 DC current measurement
Current Measurement
Measuring
Range
10 pA
100 pA
1 nA
10 nA
100 nA
1 µA
10 µA
100 µA
1) Measuring time 300ms
2) Temperature range 23 ±5°C, humidity 85% RH or less
3) Mode Self-calibration automatically executed at 1 minute interval
4) Averaging process On
Maximum
Indication
9.9999 pA
99.999 pA
999.99 pA
9.9999 nA
99.999 nA
999.99 nA
9.9999 µA
99.999 µA
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-8104 s pecifies 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 value. Refer to 5.1.5 “Setting measuring range.
Resistance accuracy = Current accuracy +
(Resistance on full-scale current)
(On full-scale current)
Voltage accuracy Accuracy
3
2.1.2 Measuring voltage output
(1) Setting voltage accuracy and resolution
Setting Voltage Range Resolution Accuracy
0.1 to 250.0V
251 to 1000V
(2) Current limiter
Setting Voltage
Range
Charge ON
0.1 to 250.0V 50mA
251 to 1000V 10mA
0.1 to 250.0V 50mA
Charge
OFF
251 to 1000V 10mA
1) There are power sources for measurement and for charging and currents for
these voltage sources are “total current = current on measuring side + current on
charge side. The power source on the charge side can be set ON and OFF by a
setting.
2) Current setting errors are ±10%.
2.2 Functional Specification
2.2.1 Measuring time
Item Setting Range
Delay Time 0 ～ 9999 ms
Averaging Cycles Auto setting
Sampling time setting
power period
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.
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.
Item Remarks
100mV
1 V
Set
Value
10mA
5mA
5mA
10mA
5mA
5mA
±( 0.1%+ 150mV )
±( 0.1%+ 400mV )
Total
Current
±50mA
±10mA
± 5mA
±10mA
± 5mA
±50mA
±10mA
± 5mA
±10mA
± 5mA
2 to 300ms
1 to 15 PLC
Current on
Measuring Side
± 5mA
± 5mA
± 5mA
± 5mA
± 5mA
±50mA
±10mA
± 5mA
±10mA
± 5mA
Current on
Charge Side
±45mA
± 5mA
± 0mA
± 5mA
± 0mA
± 0mA
± 0mA
± 0mA
± 0mA
± 0mA
Capacity range allowed for contact
detection
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 exceeds 2m.
Minimum 0.5pF. More than 1/10 of
capacity on jig side.
4
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: Current range calibration (can be executed automatically)
Self-diagnosis: Current range calibration, memory check
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 ≥ lower-limit value
Lower-limit comparison LO GO:
Upper-limit value > measured value
Calculation method for
Percent Measuring mode
Calculation method for
Deviation Measuring mode
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
Volume resistivity measurement: Outside diameter of inner electrode and thickness of
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) Dischar ge 1, (2) charge, (3) measurement (4) discharge 2
Settable patterns 10
Set time range 0.0 ~ 999.9s
(Measured value - reference value) x 100/reference value
Measured value - reference value
diameter of outer electrode
sample
5
2.2.8 Storage and display functions of measured data
(1) Measured data buffer
Measured data up to 1000 data groups can be sequentially stored.
Up to 1000 most recent data groups are stored and displayed on the
measurement screen.
Note: Stored data is cleared when the power is shut down.
(2) Histogram counter
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.
Note: Stored data is cleared when the power is shut down.
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 240x6 4dot 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 power supply goes off, the set parameters are automatically stored. When the
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-232 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.
6
(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 57RE-40360-730B (DDK)
2.3 General Specifications
General Specifications
HIOKI-specification insulation meter input connector (INPUT)
Black binding post (GND)
Blue binding post (GUARD)
Red binding post (OUTPUT)
Blue binding post (CHARGE)
Operating environment
Temperature 0 to 40°C, humidity 85% RH or less
Power supply voltage
AC 100V ±10% (standard), 115/220/240V ±10% (factory option)
Power supply frequency
50／60Hz
Power consumption
55VA max.
External dimensions (mm)
332 W x 89 H x 450 D
Weight
6.7kg
7
2.4 Options
In addition to the standard accessories listed in Table 1.1 List of 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 test rod 0GE00002
0GE00001
Measuring lead with alligator clip 0GA00007
0GA00008
Interlock connection cable DSM8104F Length 1m
2.4.2 Common options
The options common to all HIOKI insulation meters are as follows.
Option Product Name Remarks
Length 1m, red
Length 1m, black
Length 1m, red
Length 1m, black
Electrode for planar
sample,Ø50 diameter
Electrode for planar sample,
Ø 19.6 diameter
Weight electrode SME-8320 For surface and volume resistances,
Shielding box SME-8350 For shielding dielectric trouble*
Electrode for surface
resistance measurement
Electrode for surface
resistance measurement
Electrode for liquid sample SME-8330 Capacity about 25ml, electrode constant
Chip capacitor electrode SME-8360 For chip capacitor
Surface/Volume Resistance
Measurement Electrode
Standard Resistor SR-2 Calibrating standard resistor for super
*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.
SME-8310 With changeover switch for surface and
volume measurement and interlock*
SME-8311 Same as above*
shielding box used
SME-8301 For anti-electrostatic product
SME-8302 Electrode spacing 10mm
about 500cm
SM9001 Surface/Volume Resistance
measurement for static prevention floor
material
insulator meter
8
3 Operating Principles
3.1 Operating Principles
Equipped with a stable measuring voltage source and high-sensitivity current measuring
unit, this meter calculates an insulation resistance value based on measuring voltage
impressed to the work and measured current value. The meter also outputs a current
value and can be used also as a high-sensitivity ammeter embedded with a voltage
source.
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 current-voltage
conversion of a charge measuring type that integrates input current. This system
features measurement of feeble current with a high accuracy by lengthening the integral
time.
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 interfaces.
The measuring voltage source is a variable voltage source capable of outputting
1000V/10mA and 250V/50mA maximum, supplying stable measuring voltage. The
measuring voltage source of this meter can set a large maximum output current 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.
This meter has a dedicated voltage output for charging (charging terminal), which can be
used to precharge the meter 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 interface are available as
external interfaces that are supplied as standard provisions.
The measuring terminals can be changed to guard grounding or to measuring power
grounding by connecting a short bar on the panel.
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.
9
3.2 Block Diagram
10
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.
！
Warning
symbol
This symbol is marked where the operational manual
needs to be referred to.
This symbol indicates high voltage hazard and is
Electrical
Grounding
terminal
indicated on terminals where high voltage is output
such as measuring terminals.
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.
The locations where the safety alert symbols are placed are illustrated below.
ＨＡＮＤＬＥＲ
！
11
4.2 Front Panel
The front panel of the DSM-8104 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.
12
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 function 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
The connector for measurement input.
The connector of a double structure comprising a center conductor and outer
conductor connecting to measurement input and the “GUARD” terminal, respectively.
13: “GUARD” terminal
A guard terminal of the measurement input unit.
14: “GROUND” terminal
A grounding terminal connected to the housing of the meter.
15: “OUTPUT” terminal
A terminal for measuring voltage output.
Resistance is measured between the “OUTPUT” and “INPUT” terminals.
16: “CHARGE” terminal
The charging output terminal for precharging. The same level of voltage as that of
measuring voltage is output between the “CHARGE” and “OUTPUT” terminals.
13
4.3 Rear Panel
The rear panel of the DSM-8104 is illustrated below.
17: “AC LINE 50/60Hz” connector
The connector for input of power supply voltage.
18: “GND” terminal
The grounding terminal connected to the housing of the meter.
19: “GP-IB” connector
The connector for GP-IB connection.
20: “RS-232” connector
The connector for RS-232 connection.
21: “HANDLER” connector
The connector for handler connection.
22: “INTERLOCK” connector
The input connector for connection of signals from a fixture when an interlock function
is used.
23: “EXT TRIGGER” connector
The connector for external trigger input.
This connector is used when the trigger mode is set to external “EXT.”
24: Cooling fan
The fan for cooling the inside of the meter.
25: “LAN” connector (option)
The connector for LAN connection.
26: Holes for mounting remodeled connector (special order)
Holes for a custom connector of special order.
14
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 SHIFT key is pressed, a side mark (“◄”) 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 keys are locked, a side mark (“◄”) 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
extinguishes the backlight.
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 Input mode, the key will become a negative “-” polarity
input key.
７
MONI
4
MOD
1
PROG
０
LOCK
８
COMP
5
ELEC
2
OPEN
.
LCDOF
９
DATA
6
SETUP
3
V.CHK
-
MAN.T
SHIFT
E
LOCAL
BS
C.CHK
ENTER
15
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 Input mode, the key will 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 Input mode, the key will 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 Input mode, the key will become an input key (“3”).
[C. CHK]/“BS”: Contact check
The key to execute once a contact check.
When in the Numeric Input mode, the key will become a “BS (back space)” key
to delete characters that are input.
[ΔMOD]/“4”: Deviation Measuring mode
The key to move to the Deviation Value Display and Setting screen.
See “Operating Deviation Value Display and Setting Screen.”
When in the Numeric Input mode, the key will 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 Input mode, the key will 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 Input mode, the key will become an input key (“6”).
[LOCAL]/“E”: Local
The key to cancel the Remote mode.
When in the Numeric Input mode, the key will become an exponent display and
input key (“E”).
7
4
1
8
COMP
5
ELEC
2
OPEN
.
LCDOF
9
DATA
6
SETUP
3
V.CHK
-
MAN.T
SHIFT
E
LOCAL
BS
C.CHK
ENTER
16
[MONI]/“7”: Monitoring
The key to change over the Regular Measurement screen and Sequential
Measurement monitoring screen.
When in the Numeric Input mode, the key will become an input key (“7”).
[COMP]/“8”: Compare
The key to move to the Comparison Measurement Setting screen.
When in the Numeric Input mode, the key will 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 Input mode, the key will become an input key (“9”).
7
MONI
4
MOD
1
PROG
０
LOCK
8
COMP
5
ELEC
2
OPEN
.
LCDOF
DATA9SHIFT
6
SETUP
3
V.CHK
-
MAN.T
E
LOCAL
BS
C.CHK
ENTER
17
4.5 Display Screen
The display screen of the DSM-8104 is illustrated below.
“REMOTE”
When in the Remote mode (GP-IB or RS-232 mode), a side mark (“◄”) will be
displayed on the screen.
The Remote mode is not set when the side mark is not displayed.
“KEY LOCK”
When in the Key Lock mode, a side mark (“◄”) will be displayed on the screen.
The Key Lock mode is not set when the side mark is not displayed.
“INTERLOCK”
When the interlock function is on (enabled), 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 the screen indicates the status of the Shift key.
The Shift mode is not set while the side mark is not displayed.
18
“TRIG-INT”
When in the Internal Trigger mode, a side mark (“►”) will be displayed on the
screen.
“TRIG-MAN”
When in the Manual Trigger mode, a side mark (“►”) will be displa yed on the
screen.
“TRIG-EXT”
When in the External Trigger mode, a side mark (“►”) will be displayed on the
screen.
“COMP ON”
A side mark (“►”) on the screen indicates the ON/OFF status of the decision
function. The decision function is not on when the side mark is not displayed.
The side mark flashes when a decision result is NG.
“V. CHK ON”
A side mark (“►”) on the screen indicates the ON/OFF status of the voltage
check function. The voltage check function is not on when the side mark is not
displayed.
The side mark flashes when the result of a voltage check is NG.
“C. CHK ON”
A side mark (“►”) on the screen indicates the ON/OFF status of the contact
check function. The contact check function is not on when the side mark is not
displayed.
The side mark flashes when the result of a contact check is NG.
19
5 Preparations for Measurement
5.1 Setting Measuring Conditions
The meter is capable of setting measuring methods and measuring conditions
beforehand so that insulation resistances of materials, parts and circuits can be
measured easily under preset conditions.
Before explaining about measurement, this chapter describes setting of various
measuring conditions.
Press the “POWER” switch on the front panel to set it to “ON.” The “POWER” lamp on
the front panel lights up.
After initializing, the regular measurement screen sets. Measuring condition settings
such as measuring voltage and sampling time are set to the same states as those stored
when the power was shut down after previous measurement thanks to the resume
function.
[Warning]
Before turning the power on, check that the AC power supply voltage to be
used matches the power supply voltage specified on the rear panel.
If they do not match, a fire or damage to the meter may result.
[Warning]
Be certain to ground the grounding pin of the power cable or a grounding
wire to prevent an accident. If the grounding pin of the power cable or
grounding wire cannot be grounded, ground the grounding terminal located
on the rear of the meter.
Self-diagnosis
After switching the “POWER” on, press the SETUP (SET
display screen. This will take you to the screen to set the operation environment
(Operation Environment Setting screen).
Press the [F2] SELF (SELF
The screen will change to the Self-diagnosis Execute screen. (See Fig. 5.1)
ＳＥＬＦ ＣＨＥＣＫ ＥＸＥＣＵＴＥ
１．ＭＥＭＯＲＹ ＣＨＥＣＫ－－－
２．Ａ／Ｄ ＣＡＬ．－－－－－－－
３．ＲＡＮＧＥ ＣＡＬ．－－－－－
CHECK) key on the Operation Environment Setting screen.
UP) key in the measured value
ＥＸＥＣ
Fig. 5.1 Self-diagnosis Execute Screen
20
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