SM7110
SM7120
Instruction Manual
SUPER MEGOHM METER
Be sure to read this manual before
using the instrument.
When using the instrument
for the rst time
Names and Functions of Parts
Preparing for Measurement
Nov. 2018 Revised edition 3
SM7110A961-03 18-11H
p.18
p.29
Safety information
Operating Precautions
Troubleshooting
Maintenance and Service
Error display and solution
p.9
p.157
p.160
p.6
EN
Contents
Introduction ................................................ 1
Verifying Package Contents ..................... 2
Measurement Procedure........................... 5
Safety Information ..................................... 6
Operating Precautions .............................. 9
1 Overview 17
1.1 Product Overview and
Features .......................................... 17
1.2 Names and Functions of Parts ..... 18
1.3 ScreenCongurationand
Operation ........................................ 23
Measurement screens ................................23
Settings screens .........................................23
1.4 Displayed Contents of
Measurement Screen ..................... 24
1.5 Basic Key Operation ...................... 26
Displaying measurement screen ................26
Displaying the various menu settings
screens .......................................................26
Selecting settings items ..............................27
Methods for changing numerical values .....28
2 Preparing for
Measurement 29
2.1 Connecting Power Cord to
instrument ....................................... 29
2.2 Connecting Measurement Leads
to Instrument .................................. 30
2.3 Connecting Electrode .................... 30
2.4 Connecting Humidity Sensor ........ 31
2.5 Grounding Instrument ................... 31
2.6 If Measured Object Is to Be
Charged Before Measurement
(Pre-charge) .................................... 33
2.7 For Safe Measurement ................... 34
2.8 Outputting Measurement
Current Value Converted to
Analog Signal ................................. 35
2.9 TurningOn/OInstrument ............ 36
2.10 Inspection Before Use ................... 37
3 Basic Measurement 39
3.1 Setting Measured Value Display
Mode ................................................ 39
Changing display notation ..........................40
Changing displayed digits ...........................40
3.2 Setting Applied Measurement
Voltage ............................................ 41
3.3 Setting Measurement Speed ......... 43
3.4 Changing Current Range ............... 44
3.5 Connecting Measurement Leads
or Electrode to Object to Be
Measured ........................................ 45
3.6 Starting/Stopping
Measurement .................................. 46
3.7 ConrmingMeasurement
Results ............................................ 46
Detecting a measurement abnormality .......46
Temperature measurement indication ........46
3.8 Basic Measurement Examples ...... 47
4 Applied Measurement 49
4.1 Starting Measurement After
Measured Value Becomes
Stable (Delay Function) ................. 49
4.2 Reducing Variation in Measured
Values (Average Function) ............ 50
4.3 Automatic Inspection (Sequence
Program Function) ......................... 52
4.4 Setting Voltage Value for
Resistance Calculation .................. 56
4.5 Changing Measurement Starting
Conditions (Trigger Function) ....... 58
Setting the trigger mode .............................58
Inputting an external trigger ........................59
4.6 Maintaining Measurement
Accuracy
(Self-Calibration Function) ............ 60
4.7 Setting Interlock Function ............. 62
How to deactivate the interlock ...................63
4.8 Setting Pre-charge ......................... 64
4.9 Limiting Current Flowing
Through Measured Object
(Current Limiter) ............................. 65
4.10 Contact Check (Various Setting) .. 67
4.11 Canceling Capacitance of
Measurement Fixture (Fixture
Capacitance Open Correction
Function) ......................................... 70
4.12 Contact Check (Executing
Contact Check, Setting
Reference Value) ............................ 71
4.13 Setting Resistivity Calculation
(Resistivity Measurement
Function) ......................................... 73
4.14 Further Accelerating
Measurement (Function of
Updating Drawing During
Measurement) ................................. 76
1
2
3
4
SM7110A961-03
i
Contents
5 Measurement Methods
Suitable for Various
Objects to Be Measured 77
5.1 Measuring Components or
Circuits ............................................ 77
Measurement with use of a
measurement xture ...................................78
Measurement without use of a
measurement xture ...................................79
Automatic measurement .............................80
5.2 Measuring Flat Sample .................. 82
Measurement using pin type terminals .......82
Measurement using an electrode for
measuring surface resistance .....................82
Measurement using an electrode for a
at sample ..................................................83
Volume resistance measurement and
surface resistivity measurement
(the functional role of the guard electrode)
5.3 Measuring a Liquid Sample ........... 86
When using an electrode for liquid
samples ......................................................86
5.4 Measurement With Use of
Shielding Box ................................. 87
5.5 Measuring Current ......................... 88
....83
6 Judging Measured
Value (Comparator
Function) 89
6.1 Setting Judgment Sound ............... 91
6.2 ConrmingJudgmentResults ...... 92
7 Saving and Loading
Settings (Panel Saving
and Loading) 93
7.1 Saving Settings (Panel Saving
Function) ......................................... 94
7.2 Loading Settings
(Panel Loading Function) .............. 95
7.3 Changing Panel Name ................... 96
7.4 Deleting Panel Contents ................ 97
8 System Setting 99
8.3 Browsing, Deleting, and
Outputting Internal Memory Data 101
Browsing and deleting data ......................102
8.4 Checking Voltage Error
(Voltage Monitor Check Function)
8.5 Preventing Test From Being
Incorrectly Started
(Double Action Function) ............ 104
8.6 Adjusting Screen Contrast .......... 104
8.7 Adjusting Backlight Brightness .. 105
8.8 Changing Power Frequency
Setting (Power Frequency
Setting Function) .......................... 105
8.9 Initializing Settings (Reset) ......... 106
Default setting list .....................................107
8.10 Checking Instrument Information 108
103
9 External Control
(EXT I/O) 109
9.1 Switching Current Sink (NPN) /
Current Source (PNP) ...................110
9.2 External Input/Output Terminals
and Signals ....................................110
Instrument-side connector and mating
connectors ................................................ 110
Instrument-side connector pin assignment
Function of each of the signals ................. 112
9.3 Timing Chart ..................................114
From when measurement starts to
when judgment result is acquired ............. 114
Output signal status on start-up ................ 11 9
Flowchart for acquiring a judgment
result or a measured value with the
external trigger setting .............................. 119
9.4 InternalCircuitConguration ..... 120
Electrical
Specications ............................................121
Examples of connection ............................122
9.5 Assembling Male Connector for
EXT I/O (Accessory) ..................... 123
9.6 EXT I/O Terminal Input and
Output Testing .............................. 124
9.7 Settings for External Input and
Output ........................................... 125
Trigger logic ..............................................125
Trigger lter ...............................................126
GO-signal outputting logic level ................127
EOM signal output mode ..........................128
.. 111
8.1 Setting Sound of Key Operation ... 99
8.2 Disabling Key Operation
(Key Lock Function) ..................... 100
ii
Contents
10 Communications (USB,
RS-232C, GP-IB) 129
10.1 Summary and Features of
Interface ........................................ 129
10.2 USB Interface ................................ 130
Installing the USB driver ...........................130
Connecting the USB cable ........................130
Setting the instrument ...............................131
10.3 RS-232C Interface ........................ 132
Connecting the RS-232C cable ................132
Setting the instrument ...............................133
Setting the controller (Computer or PLC) .133
10.4 GP-IB Interface ............................. 134
Connecting the GP-IB cable .....................134
Setting the instrument ...............................134
10.5 Settings Common to Interfaces .. 136
Outputting measured values
(data output function)
(RS-232C and USB only) ..........................136
Displaying communication commands
(communication monitor function) .............137
10.6 Control by Using Commands ...... 138
Remote state ............................................138
Local state ................................................138
Appx. 3 Sample calculation of
resistance measuring
accuracy (SM7110) ........... Appx.3
Appx. 4 Countermeasures
Against Noise ................... Appx.4
Appx. 5 Using Instrument as
Ammeter (If Operated
in Combination With
External Power Supply) ... Appx.7
Appx. 6 Assembling Switching
Unit for Objects to be
Measured .......................... Appx.9
Connecting objects to be measured and
the switching unit to the instrument .....Appx.9
Selecting relays to be installed in the
switching unit .....................................Appx.10
Circuit diagram of the switching unit .. Appx.11
Including current-limiting resistor
(protective resistance) and relay ........ Appx.11
Current-limiting resistor ......................Appx.12
Appx. 7 Modifying Measurement
Lead ................................ Appx.13
Appx. 8 Mounting Instrument in
Rack ................................ Appx.15
Appx. 9 Dimensional Diagram .... Appx.18
11
12
5
6
11 Specications 139
11.1 GeneralSpecications ................ 139
11.2 Input/Output/Measurement
Specications ............................... 140
Basic specications ..................................140
Accuracy specications ............................141
11.3 Functionspecications ............... 145
11.4 InterfaceSpecications ............... 152
11.5 ExternalI/OSpecications .......... 154
12 Maintenance and
Service 157
12.1 Troubleshooting ........................... 157
Q&A (Frequently Asked Questions) ..........157
Error display and solution .........................160
12.2 Inspection, Repair and Cleaning 162
Appendix Appx.1
Appx. 1 Internal Circuits ............... Appx.1
Appx. 2 Changes in Current
Running through
Insulator ............................ Appx.2
Index Ind.1
7
8
9
10
Appx. Ind.
iii
Contents
iv
Introduction
Thank you for purchasing the Hioki SM7110/SM7120 Super Megohm Meter. To obtain maximum
performance from the instrument, please read this manual rst, and keep it handy for future
reference.
Trademark
• Adobe and Adobe Reader are trademarks of Adobe Systems Incorporated.
• Microsoft and Windows are either registered trademarks or trademarks of Microsoft Corporation
in the United States and other countries.
• TEFLON is a registered trademark or a trademark of The Chemours Company FC, LLC.
Notation
Introduction
*
SET
(Bold character)
[ ]
Additional information is presented below.
Operation keys are displayed in bold.
Names on the screen are indicated with brackets [ ].
Accuracy
We dene measurement tolerances in terms of f.s. (full scale), rdg. (reading), dgt. (digit) values,
and setting with the following meanings:
f.s.
rdg.
dgt.
setting
(maximum display value or scale range)
The currently selected range.
(reading or displayed value)
The value currently being measured and indicated on the measuring instrument.
(resolution)
The smallest displayable unit on a digital measuring instrument, i.e., the input value that
causes the digital display to show a “1” as the least-signicant digit.
(set value)
Displays set values such as the voltage output value and current value.
1
Verifying Package Contents
Verifying Package Contents
When you receive the instrument, inspect it carefully to ensure that no damage occurred during
shipping. In particular, check the accessories, panel switches, keys, and connectors. If damage
is evident, or if it fails to operate according to the specications, contact your authorized Hioki
distributor or reseller.
Main unit and accessories
Conrm that these contents are provided.
Model SM7110 or SM7120
Super Megohm Meter
Shorting plug
(For connecting the GROUND terminal
with the OUTPUT terminal [or the GUARD
terminal])
Male connector for EXT I/O Power cord
Instruction Manual
CD (Communications Command Instruction
Manual, USB driver)*
* The latest version can be downloaded from
our website.
2
Verifying Package Contents
Options
The following options are available for the instrument. Contact your authorized Hioki distributor or
reseller when ordering.
Measurement leads
See p. 11.
Model L2230 Pin Type Lead (Red) Model L2231 Pin Type Lead (Black)
Length: 1 m Length: 1 m
Terminal shape: Triaxial BNC Terminal shape: Banana
Maximum rated voltage: 2000 V Maximum rated voltage: 2000 V
Maximum rated current: 1 A Maximum rated current: 1 A
Model L2232 Clip Type Lead (Red) Model L2233 Clip Type Lead (Black)
Length: 1 m Length: 1 m
Terminal shape: Triaxial BNC Terminal shape: Banana
Maximum rated voltage: 2000 V Maximum rated voltage: 2000 V
Maximum rated current: 1 A Maximum rated current: 1 A
Model L2234 Open Lead (Red) Model L2235 Open Lead (Black)
Length: 3 m Length: 3 m
Terminal shape: Triaxial BNC Terminal shape: Banana
Maximum rated voltage: 2000 V Maximum rated voltage: 2000 V
Maximum rated current: 1 A Maximum rated current: 1 A
Communication cables
Model 9637 RS-232C Cable
(9pin-9pin/1.8m)
Model 9638 RS-232C Cable
(9pin-25pin/1.8m)
Model 9151-02 GP-IB
Connector Cable (2 m)
3
Verifying Package Contents
Electrodes
Conversion of the connectors is required to connect these electrodes. Contact your authorized
Hioki distributor or reseller.
Model SME-8301 Surface Resistance
Measurement Electrode
Model SME-8310 Plate Sample Electrode Model SME-8311 Electrode for Flat Sample
Model SME-8320 Weight Electrode Model SME-8330 Liquid Sample Electrode
Model SME-8350 Shielding Box Model SME-8360 Electrode for Chip Capacitor
Model SME-8302 Electrode for Surface
Resistance
Model SM9001 Surface/Volume Resistance
Measurement Electrode
Model SR-2 Standard Resistor
Temperature and humidity sensor Other
Model Z2011 Humidity Sensor Model DSM8104F Interlock Cable
Required to use the interlock function in
combination with Model SME-8310, SME-8311, or
SME-8350.
4
Measurement Procedure
Be sure to read “Operating Precautions” (p. 9) beforehand.
Installing, connecting, and turning on the instrument
Measurement Procedure
Install the instrument. (p. 10)
Connect the power cord to the instrument. (p. 29)
Connect the measurement lead, electrode, and the
Humidity Sensor to the instrument. (p. 30)
Connect other devices to the instrument via the
external interface (as needed).
• Use the EXT I/O. (p. 110)
• Connect a computer to the instrument for communications
through USB, RS-232C, or GP-IB. (p. 129)
Turn on the instrument. (p. 36)
(It takes at least 30 minutes to complete a warm-up.)
Setting the instrument (p. 39)
Connect the measurement lead and
electrode to the instrument.
Turn on the instrument.
Connect the power cord
to the instrument.
Connect the temperature
and humidity sensor to
the instrument.
Use the EXT I/O.
Communicate with the computer
through USB, RS-232C, or GP-IB.
Set the measurement conditions (as needed).
• Basic setting (p. 39)
• Customized setting for measurement conditions (p. 49)
• Setting related to the system (p. 99)
• Default setting table (p. 107)
Starting the measurement
Execute the open correction. (p. 67)
If contact check is set to ON, execute the open correction.
Connect the measurement lead to an object to be
measured. (p. 45)
Start the measurement. (p. 46)
Check the measured values. (p. 46)
Press the STOP key to end the measurement. (p. 46)
If the trigger source setting is set to [EXTERNAL], the measurement automatically stops in completion
of each measurement.
Ending
Turn o the instrument. (p. 36)
5
Safety Information
Safety Information
This instrument is designed to conform to IEC61010 Safety Standards, and has been thoroughly
tested for safety prior to shipment. However, using the instrument in a way not described in this
manual may negate the provided safety features.
Before using the instrument, be certain to carefully read the following safety notes:
DANGER
Mishandling during use could result in injury or death, as well as damage to the
instrument. Be certain that you understand the instructions and precautions in
the manual before use.
WARNING
With regard to the electricity supply, there are risks of electric shock, heat
generation, re, and arc ash due to short circuits. If persons unfamiliar with
electricity measuring instrument are to use the instrument, another person
familiar with such instruments must supervise operations.
Notation
In this manual, the risk seriousness and the hazard levels are classied as follows.
DANGER
WARNING
CAUTION
IMPORTANT
Indicates an imminently hazardous situation that will result in death or serious injury
to the operator.
Indicates a potentially hazardous situation that may result in death or serious injury to
the operator.
Indicates a potentially hazardous situation that may result in minor or moderate injury
to the operator or damage to the instrument or malfunction.
Indicates information related to the operation of the instrument or maintenance tasks
with which the operators must be fully familiar.
Indicates a high voltage hazard.
If a particular safety check is not performed or the instrument is mishandled, this may
give rise to a hazardous situation; the operator may receive an electric shock, may
get burnt or may even be fatally injured.
Indicates prohibited actions.
Indicates the action which must be performed.
6
Symbols on the instrument
Indicates cautions and hazards. When the symbol is printed on the instrument, refer to a
corresponding topic in the Instruction Manual.
Indicates that dangerous voltage may be present at this terminal.
Indicates the ON side of the power switch.
Indicates the OFF side of the power switch.
Indicates a grounding terminal.
Indicates DC (Direct Current).
Indicates AC (Alternating Current).
Symbols for various standards
Safety Information
Indicates the Waste Electrical and Electronic Equipment Directive (WEEE Directive) in EU
member states.
Indicates that the product conforms to regulations set out by the EU Directive.
7
Safety Information
Measurement categories
To ensure safe operation of measuring instruments, IEC61010 establishes safety standards
for various electrical environments, categorized as CAT II to CAT IV, and called measurement
categories.
DANGER
• Using a measuring instrument in an environment designated with a higher-
numbered category than that for which the instrument is rated could result in a
severe accident, and must be carefully avoided.
• Never use a measuring instrument that lacks category labeling in a CAT II to
CAT IV measurement environment. Doing so could result in a serious accident.
CAT II: When directly measuring the electrical outlet receptacles of the primary electrical
circuits in equipment connected to an AC electrical outlet by a power cord (portable
tools, household appliances, etc.)
CAT III: When measuring the primary electrical circuits of heavy equipment (xed installations)
connected directly to the distribution panel, and feeders from the distribution panel to
outlets
CAT IV: When measuring the circuit from the service drop to the service entrance, and to the
power meter and primary overcurrent protection device (distribution panel)
Distribution Panel
Service Entrance
Service Drop
CAT IV
Power Meter
Internal Wiring
CAT III
Fixed Installation
CAT II
T
Outlet
8
Operating Precautions
Operating Precautions
Follow these precautions to ensure safe operation and to obtain the full benets of the various
functions.
DANGER
If the measurement lead or the instrument is damaged, there is a risk of electric
shock. Before using the instrument, perform the following inspection:
• Before using the instrument check that the coating of the measurement leads
are neither ripped nor torn and that no metal parts are exposed. Using the
instrument under such conditions could result in electric shock. Replace the
measurement leads with those specied by our company.
• Verify that the instrument operates normally to ensure that no damage occurred
during storage or shipping. If you nd any damage, contact your authorized
Hioki distributor or reseller.
To prevent an electric shock, conrm that the braided conductor for shielding
wire is not exposed. If a braided conductor for shielding wire is exposed, do not
use the cable.
Instrument installation
Installing the instrument in inappropriate locations may cause a malfunction of
instrument or may give rise to an accident. Avoid the following locations:
• Exposed to direct sunlight or high temperature
• Exposed to corrosive or combustible gases
• Exposed to a strong electromagnetic eld or electrostatic charge
• Near induction heating systems (such as high-frequency induction heating
systems and IH cooking equipment)
• Susceptible to vibration
• Exposed to water, oil, chemicals, or solvents
• Exposed to high humidity or condensation
• Exposed to high quantities of dust particles
Do not place the instrument on an unstable table or an inclined place. Dropping or
knocking down the instrument can cause injury or damage to the instrument.
This instrument is not drip-proof. Water droplets on the connector may result in
malfunctions.
WARNING
CAUTION
9
Operating Precautions
Installing the instrument
To prevent overheating, be sure to leave the specied clearances around the instrument.
• Install with the bottom surface facing downward.
• Vents must not be obstructed.
50 mm or more50 mm or more
15 mm or more
“Extending and retracting the stands” (p. 20)
10 mm or more
Rear
Handling the instrument
To avoid electric shock, do not remove the instrument’s case. The internal
components of the instrument carry high voltages and may become very hot
during operation.
To avoid damage to the instrument, protect it from physical shock when transporting
and handling. Be especially careful to avoid physical shock from dropping.
This instrument may cause interference if used in residential areas. Such use must be avoided
unless the user takes special measures to reduce electromagnetic emissions to prevent
interference to the reception of radio and television broadcasts.
DANGER
CAUTION
10
Before connecting the power cord to the instrument
DANGER
Use only the designated power cord with this instrument. Use of other power
cords may cause re.
WARNING
• Before turning the instrument on, make sure the supply voltage matches that
indicated on its power connector. Connection to an improper supply voltage
may damage the instrument and present an electrical hazard.
• To avoid electrical accidents and to maintain the safety specications of this
instrument, connect the power cord provided only to a 3-contact (two-conductor
+ ground) outlet.
CAUTION
• Do not connect the supply voltage improperly. Doing so may damage the instrument’s
internal circuitry.
• To avoid damaging the cords, unplug it by grasping the connector, not the cord.
Operating Precautions
Before connecting the measurement leads and electrode to the instrument
WARNING
• Do not use the instrument with circuits that exceed its ratings or specications.
Doing so may damage the instrument or cause it to become hot, resulting in
electric shock.
• The maximum rated voltage to earth of the input terminal is 1000 V DC for Model
SM7110 and 2000 V DC for Model SM7120. Do not apply any higher voltage
input to the input terminal.
• Use only the specied measurement lead. If using a measurement lead other
than the one specied, you cannot perform measurement safely.
• To avoid electric shock, do not exceed the lower of the ratings shown on the
instrument and test leads.
Before connecting the Humidity Sensor to the instrument
CAUTION
• The sensor used in the Humidity Sensor is a thin, precision platinum lm. Be aware
that excessive voltage pulses or static discharges can destroy the lm.
• Avoid subjecting the tip of the Humidity Sensor to physical shock, and avoid sharp
bends in the leads. These may damage the probe or break a wire.
• Note that the ambient temperature does not exceed the temperature range specied
in Refer to “Specications of Model Z2011 Humidity Sensor” (p. 144).
11
Operating Precautions
Before connecting the measurement leads or electrode to an object to be
measured
WARNING
Between either of the following terminals, a maximum voltage of 1000 V may be
generated depending on the measurement voltage settings.
• Between the OUTPUT terminal and the INPUT terminal
• Between the OUTPUT terminal and the GUARD terminal
To avoid danger, be sure to turn o the instrument before connecting the
measured object to the measurement terminal.
If the GUARD terminal and the GROUND terminal are connected with each other,
be aware that high voltage is also generated between the OUTPUT terminal and
the ground.
Before grounding the instrument
WARNING
• During measurements of an object grounded by one wire, if the OUTPUT
terminal and the GROUND terminal are connected with each other, a maximum
voltage of 2000 V to the earth is applied on the GUARD terminal, INPUT
terminal, and an external electrode (the shielding side of measurement lead),
according to the measurement voltage settings. Take precautions to avoid an
electric shock.
• If the GUARD terminal and the GROUND terminal are connected with each other,
a maximum voltage of 2000 V is applied between the OUTPUT terminal and the
ground (the GROUND terminal is grounded), according to the measurement
voltage settings. Take precautions to avoid an electric shock.
Before performing a measurement
• While measuring insulation resistance, and when pressing the START key,
dangerous voltage is applied to the measurement terminals. To avoid electric
shock, do not touch the measurement leads.
• Even after the STOP key is pressed, the measurement voltage may remain in
the measured object. Because there is a risk of an electric shock, take care
to not touch metallic parts to which the voltage is applied until they are fully
discharged.
• The set voltage is applied to the measured object. Take precautions to avoid an
electric shock.
WARNING
12
Before performing an automatic measurement
CAUTION
To protect the relay contacts, switching the measurement terminals
with relays leaving a measurement voltage output requires a protective
resistor* inserted in series in the circuit.
Protective resistance value ≥ (Measurement voltage) / (Maximum allowable
current)
* Implements resistance to prevent the current owing through the contact from
exceeding the maximum allowable current of the contact
Before using the shielding box
WARNING
A maximum measurement voltage of 2000 V may be generated between the
GUARD terminal or the OUTPUT terminal and the GROUND terminal according to
a connecting manner of the shorting plug.
Be sure to connect the external case of the shielding box to the GROUND
terminal.
To prevent an electric shock, use the interlock function (p. 62).
In addition, take sucient precautions to avoid an electric shock.
Operating Precautions
Before removing the measured object
WARNING
If a high-voltage is used to measure resistance, because measurement voltage
may remain in the measured object even after the measurement has ended, there
is the risk of an electric shock if you try to immediately remove the object. Set the
time in Discharge 2 relatively longer and remove the measured object after the
dangerous voltage has been discharged.
Before controlling the instrument externally
Read the following precautions before also using the interlock function.
WARNING
To avoid electric shock or damage to the equipment, always observe the following
precautions when connecting to connectors:
• Be careful to avoid exceeding the ratings of connectors.
• During operation, a wire becoming dislocated and contacting another
conductive object can be serious hazard. Use screws to secure the RS-232C
connector, GP-IB connector, and EXT I/O terminal.
• Ensure that devices and systems to be connected to the RS-232C connector,
GP-IB connector, EXT I/O terminal, or INTER LOCK terminal are properly
isolated.
13
Operating Precautions
CAUTION
You must not operate the EXT I/O MODE switch (NPN/PNP) during the instrument
turned on.
Select the external I/O mode between NPN and PNP based on devices that are
externally connected (p. 110).
Before connecting the communication cable to the instrument
DANGER
To avoid electrical hazards and damage to the instrument, do not apply voltage
exceeding the rated maximum to the EXT I/O terminal.
CAUTION
• Use a common ground for both the instrument and the computer. Use of dierent
ground circuits will result in a potential dierence between the instrument’s ground
and the computer’s ground. If the communications cable is connected while such a
potential dierence exists, it may result in equipment malfunction or failure.
• Before connecting any communications cable to the instrument or disconnecting any
communications cable from the instrument, always turn o the instrument and the
computer. Failure to do so could result in equipment malfunction or damage.
• After connecting the communications cable, tighten the screws on the connector
securely. Failure to secure the connector could result in equipment malfunction or
damage.
Before performing the open correction
If an open correction is carried out, a measurement voltage is instantly output
from the measurement terminal.
Before carrying out an open correction (pressing the F2 key [EXEC]), check that
no human body is in contact with any jigs or measurement circuits. There is the
risk of an electric shock because a maximum voltage of 2000 V is produced.
WARNING
Before using the instrument as an ammeter
CAUTION
• To avoid malfunctions of the instrument, insert an adequate protective resistor
between the external power supply and the object to be measured. A short-circuit of
the terminals of the object causes the instrument to be subject to a voltage output
from the external power supply.
• To avoid malfunctions of the instrument, limit the input current at up to 1.8 mA during
the testing using a measurement voltage of between 1000 V and 2000 V.
See “Appx. 5 Using Instrument as Ammeter (If Operated in Combination With External Power
Supply)” (p. Appx.7).
14
Operating Precautions
Precautions during shipment
Store the packaging in which the instrument was delivered, as you will need it when transporting
the instrument.
CD precautions
• Exercise care to keep the recorded side of discs free of dirt and scratches. When writing text
on a disc’s label, use a pen or marker with a soft tip.
• Keep discs inside a protective case and do not expose to direct sunlight, high temperature, or
high humidity.
• Hioki is not liable for any issues your computer system experiences in the course of using this
disc.
15
Operating Precautions
16
1
Overview
1.1 Product Overview and Features
This instrument is an insulation resistance meter containing a highly sensitive ammeter and a lownoise voltage supply.
Employing the triaxial BNC connector enables the instrument to measure high resistance such as
resistance of insulators with no inuence of exogenous noise.
The maximum measurement voltages of Model SM7120 and Model SM7110 are 2000 V and 1000 V,
respectively.
Stable measurements for a variety of items
• The triaxial BNC connector is used to have external noise resistant structures.
• The maximum measurement voltage is 2000 V, so various objects can be simply measured with
a single instrument.
• The instrument has a wide measuring range. (Depends on applied voltage)
• Resistance measuring range: (p. 142); Current measuring range: 0.1 fA to 2 mA
• Because temperature and humidity can be measured simultaneously, change in resistance can
be checked against the change in temperature and humidity.
• The contact check function enables you to perform stable measurements even when a voltage
applied to measured objects is 2000 V or higher.
Suitable for production lines
• High-speed measurement; it takes only 6.4 ms from input of a trigger to output of the INDEX
signal.
• The frequency change function of contact check reduces interference with other devices in the
production line.
• It is not necessary to correct cable length even when changing production line construction
because the instrument automatically corrects the cable length of contact check.
• Because you can check the control status with the command monitor function and the external
I/O monitor function, you can quickly construct a production line.
• Because the external I/O is compatible with both NPN and PNP types, you can immediately use it
on your production line.
1
Overview
What can be measured
• Insulation resistance between capacitor terminals
• Insulation resistance between a battery terminal and a case
• Insulation resistance between coils of common mode lters
• Checking breakdown voltage
• Surface resistivity and volume resistivity of lm, etc.
• Insulation resistance of liquid sample
17
Names and Functions of Parts
1.2 Names and Functions of Parts
Front
The model illustrated below is
Model SM7120.
HIGH VOLTAGE LED
Lights up while a high voltage
is output.
Measurement terminals
Connect measurement leads to
these terminals.
See p. 11.
Screen
Monochrome graphic LCD
Operation keys (p. 21)
1
Measurement
terminal
INPUT
1
GUARD
2
GROUND
3
OUTPUT
4
2 43 5
Description
This is a measurement input terminal.
Has triaxial structure. The central conductor is for measurement input. The secondoutermost electrode is connected with the GUARD terminal. The second-outermost
electrode is connected with the GROUND terminal.
Electromagnetic shielding wire
Guard wire for
measurement
Measurement input wire
This is a guard terminal.
It is the common side of the ammeter.
Used in order to take the guard that cancels the eect of the a leakage current owing
through the retainer, measurement xture, etc. of the measured object.
The GUARD terminal has a negative (−) electrical polarity.
This is a ground terminal.
Used to reduce the eects of noise and minimize the risk of an electric shock.
Usually connected to the OUTPUT terminal or the GUARD terminal with the shorting
plug.
This is a voltage output terminal.
Insulation resistance is measured between this OUTPUT terminal and the INPUT
terminal.
The electrical polarity of the OUTPUT terminal is positive (+).
Additionally installing the shield
wires in the measurement
line enables the instrument to
perform stable measurement
with no inuence of exogenous
noise.
18
Names and Functions of Parts
Rear
Measurement
terminal
CHARGE
5
Description
This is a charge voltage output terminal.
Used to pre-charge objects before measurement.
The pre-charge voltage is output between the CHARGE terminal and the GROUND
terminal. The voltage is same as the measurement voltage. The CHARGE terminal has
the same electric potential as the OUTPUT terminal, and its electrical polarity is positive
(+).
1 2 3 4 5 6
7 8 9 10 11 12
1
Overview
Name Description
Power switch See p. 36.
1
Power inlet
2
Vents Keep the vents clear of obstructions.
3
Serial number
4
D/A OUTPUT terminal Outputs a voltage proportional to the measured value. (p. 35)
5
INTER LOCK terminal
6
EXT I/O terminal
7
EXT I/O MODE
8
switch
Connect the accessory power cord to this inlet. (p. 29)
See p. 11.
Indicates the serial number.
The serial number consists of 9 digits. The rst two (from the left)
indicate the year of manufacture, and the next two indicate the month of
manufacture.
Do not remove this label because it is required for product support.
Used when the interlock function is enabled to prevent an electric shock.
(p. 62)
See p. 13.
Connects an external controller to this connector. (p. 109)
See p. 13.
Left: Current sink (NPN), Right: Current source (PNP) (p. 110)
USB connector
9
GP-IB connector
10
RS-232C connector
11
TEMP. SENSOR terminal Connects Model Z2011 Humidity Sensor to this terminal. (p. 31)
12
Connects a computer to one of these connectors. (p. 129)
19
Names and Functions of Parts
Bottom
Stands
Right
Extending and retracting the stands
Vent Handle
Do not apply heavy downward pressure with the stand extended. The stand could be
damaged.
Left
CAUTION
Vents
20
Operation keys
Names and Functions of Parts
10 11
1
15
1
2
3
These keys also serve as the
numeric keypad to enter the
numerical values.
16
Key Description
Switches the measurement mode.
The mode changes every time the key is pressed in the following order:
Resistance, Current, Surface resistance, Volume resistance, Liquid
volume resistance, and returns back to Resistance.
Switches the present current range to the next upper one. You can change
settings on the measurement screen. The range changes every time the key is
pressed in the following order:
20 p, 200 p, 2 n, 20 n, 200 n, 2 u, 20 u, 200 u, and 2 m.
Some ranges are not available depending on the measurement speed setting.
Switches the present current range to the next lower one. You can change settings
on the measurement screen.
The range changes every time the key is pressed in the reverse order of the
above.
2
3
4
5
6
12
1
Overview
7
8
13 14
9
10
11
12
Switches the present measurement voltage to the next upper one.
4
5
6
7
8
The voltage changes every time the key is pressed in the following order:
0.1, 0.5, 1, 2.5, 5, 10, 25, 50, 100, 250, 500, 1000, (1500, and 2000).
Switches the present measurement voltage to the next lower one. The voltage
changes every time the key is pressed in the reverse order of the above.
Displays the comparator settings screen.
Displays the panel load / panel save screen.
Switches the measurement speed. You can change settings on the measurement
screen.
The speed changes every time the key is pressed in the following order:
FAST, FAST2, MED, SLOW, SLOW2, and returns back to FAST.
Some measurement speeds are not available depending on the current
range setting.
9
Disables the remote control (communicating with an external device) and enables
the key operation.
Starts measurement.
Stops measurement.
• Moves the cursor to another setting item or digit.
• Changes numerical values.
13
• Cancels the setting.
• Returns to the measurement screen from other screens.
21
Names and Functions of Parts
Key Description
14
15
16
to
Settles the setting.
Inputs the trigger if the external trigger setting is used.
Moves the screen to another menu settings screen.
Function keys. Selects item on each settings screen.
22
Screen Conguration and Operation
1.3 Screen Conguration and Operation
The screens of the instrument consists of the measurement screens and the settings screens.
Measurement screens
Resistance value measurement mode (initial screen)
1
Overview
Current value measurement mode
Surface resistivity measurement mode
Liquid volume resistivity measurement mode
Settings screens
Comparator settings screen
You can also display the screen if you select the [COMP] tab on the menu settings screen.
Panel load / panel save screen Menu settings screen
Volume resistivity measurement mode
See “List of menu settings screens” (p. 27).
23
Displayed Contents of Measurement Screen
1.4 Displayed Contents of Measurement Screen
1 2 3 4 5 7
8
9
10
11
Performs contact check.
(Available only with contact
check setting set to [ON])
Displays menu settings screen (p. 27)
Name Description
Displays the presently set trigger.
Trigger setting
1
[INT] Internal trigger
[EXT] External trigger
6
12
13
14
Enables change of the
measurement conditions
Changes measurement condition
contents to be displayed.
Sampling data Appears during the sampling data.
2
Self-calibration Appears during the self-calibration.
3
Voltage monitor check
4
Contact check
5
Open correction
6
execution result
Interlock
Key lock
7
Remote [RMT]
Measurement judgment Displays the judgment result if the comparator function is enabled.
8
Voltage monitor value The voltage produced by the instrument is displayed.
9
Temperature
10
Humidity
11
Measured value
12
Appears when the voltage monitor check function is enabled.
Highlighted in reverse video if the voltage is abnormal.
Appears when the contact check function is enabled.
Highlighted in reverse video if a contact error occurs.
Displays the result when the open correction is executed once.
[I.LOCK] Appears while the interlock function is activated.
[K.LOCK] Appears while the key lock function is activated.
Displays [I.LOCK] while both the interlock and the key lock functions are
activated.
Appears while the instrument is placed in the remote status
(communicating with an external device).
Pressing the LOCAL key disables the remote control.
Displays temperature and humidity if the Humidity Sensor is connected.
Displays an error message if the Humidity Sensor is not connected to the
instrument (p. 161).
See “2.4 Connecting Humidity Sensor” (p. 31).
Displays the measured value corresponding to the measured value display
mode (p. 39).
24
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