Hioki SM7420 User manual

SM7420
Instruction Manual
SUPER MEGOHM METER
EN
Nov. 2018 Revised edition 2
SM7420A961-02 18-11H
Be sure to read this manual before
using the instrument.
Safety information
Operating Precautions
 p.7
 p.8
When using the instrument for the
rst time Troubleshooting
Names and Functions of Parts
 p.16 Maintenance and Service  p.133
Preparing for Measurement  p.27 Error display and solution  p.136
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

i
Out-of-range indication ...............................39
3.8 Basic Measurement Examples......... 40
4 Applied Measurement 43
4.1 Starting Measurement After
Measured Value Becomes Stable
(Delay Function)............................... 43
4.2 Reducing Variation in Measured
Values (Average Function)............... 44
4.3 Changing Measurement Starting
Conditions (Trigger Function)........... 46
Setting the trigger mode .............................46
Inputting an external trigger ........................46
4.4 Maintaining Measurement
Accuracy (Self-Calibration Function) 47
4.5 Contact Check (Various Settings) .... 49
4.6 Canceling Capacitance of
Measurement Fixture
(Fixture Capacitance Open
Correction Function)......................... 52
4.7 Contact Check (Executing Contact
Check,Setting Reference Value) ..... 53
4.8 Setting Resistivity Calculation
(Resistivity Measurement Function). 55
4.9 Further Accelerating Measurement
(Function of Updating Drawing
During Measurement) ...................... 58
5 Measurement Methods
Suitable for Various
Objects to Be Measured 59
5.1 Measuring Components of Circuits .. 59
Measurement with use of a
measurement xture ...................................60
Measurement without use of a
measurement xture ...................................61
Automatic measurement.............................62
5.2 Measuring Flat Sample .................... 63
Measurement using pin type terminals .......63
Measurement using an electrode for
measuring surface resistance.....................63
Measurement using an electrode for a
at sample ..................................................64
Volume resistance measurement and
surface resistivity measurement
(the functional role of the guard electrode) .64
5.3 Measuring a Liquid Sample.............. 66
When using an electrode for liquid
samples ......................................................66
5.4 Measurement With Use of
Shielding Box ................................... 67
Contents
Introduction.................................................. 1
Notati ........................................................... 1
Verifying Package Contents ........................ 3
Measurement Procedure............................. 6
Safety Information ....................................... 7
Operating Precautions................................. 8
1 Overview 15
1.1 Product Overview and Features....... 15
1.2 Names and Functions of Parts......... 16
1.3 Screen Conguration and Operation 21
Measurement screens ................................21
Settings screens .........................................22
1.4 Basic Key Operation ........................ 23
Displaying measurement screen ................23
Displaying the various menu settings
screens .......................................................23
Selecting settings items ..............................24
Methods for changing numerical values .....25
2 Preparing for
Measurement 27
2.1 Connecting Power Cord to
Instrument ........................................ 27
2.2 Connecting Measurement Leads
to Instrument .................................... 28
2.3 Connecting Electrode....................... 28
2.4 Connecting Humidity Sensor............ 29
2.5 Outputting Measurement Current
Value Converted to Analog Signal.... 30
2.6 Turning On/Off Instrument................ 31
2.7 Inspection Before Use...................... 32
3 Basic Measurement 33
3.1 Setting Measured Value Display
Mode ................................................ 33
Changing display notation ..........................34
Changing displayed digits...........................34
3.2 Setting Voltage Value for
Resistance Calculation..................... 35
3.3 Setting Measurement Speed............ 36
3.4 Changing Current Range ................. 37
3.5 Connecting Measurement Leads
or Electrode to Object to Be
Measured ......................................... 38
3.6 Starting/Stopping Measurement....... 39
3.7 Conrming Measurement Results.... 39
Detecting a measurement abnormality .......39
Temperature measurement indication ........39
SM7420A961-02
4
3
2
1
5

Contents
ii
Output signal status on start-up..................97
Flowchart for acquiring a judgment
result or a measured value with the
external trigger setting ................................97
9.4 Internal Circuit Conguration............ 98
Electrical Specications ..............................99
Examples of connection............................100
9.5 Assembling Male Connector for
EXT I/O (Accessory)....................... 102
9.6 EXT I/O Terminal Input and Output
Testing............................................ 103
9.7 Settings for External Input and
Output ............................................ 104
Trigger logic ..............................................104
Trigger lter...............................................105
GO-signal outputting logic level ................106
EOM signal output mode ..........................107
10 Communications
(USB,RS-232C,GP-IB) 109
10.1 Summary and Features of Interface109
10.2 USB Interface..................................110
Installing the USB driver ........................... 110
Connecting the USB cable........................ 110
Setting the instrument............................... 111
10.3 RS-232C Interface ..........................112
Connecting the RS-232C cable ................ 112
Setting the instrument............................... 113
Setting the controller (Computer or PLC) . 113
10.4 GP-IB Interface ...............................114
Connecting the GP-IB cable ..................... 114
Setting the instrument............................... 114
10.5 Settings Common to Interfaces.......116
Outputting measured values (data
output function)
(RS-232C and USB only).......................... 116
Displaying communication commands
(communication monitor function)............. 117
10.6 Control by Using Commands ..........118
Remote state ............................................ 118
Local state ................................................ 118
11 Specications 119
11.1 General Specications ....................119
11.2 Input/Output/Measurement
Specications ................................. 120
Basic specications ..................................120
Accuracy specications ............................121
11.3 Function specications................... 124
11.4 Interface Specications .................. 130
11.5 External I/O Specications ............. 131
5.5 Measuring Current ........................... 68
6 Judging Measured
Value (Comparator
Function) 69
6.1 Setting Judgment Sound.................. 71
6.2 Conrming Judgment Results .......... 72
7 Saving and Loading
Settings (Panel Saving
and Loading) 73
7.1 Saving Settings
(Panel Saving Function)................... 74
7.2 Loading Settings
(Panel Loading Function) ................. 75
7.3 Changing Panel Name ..................... 76
7.4 Deleting Panel Contents .................. 77
8 System Setting 79
8.1 Setting Sound of Key Operation....... 79
8.2 Disabling Key Operation
(Key Lock Function) ......................... 80
8.3 Browsing,Deleting,and Outputting
Internal Memory Data....................... 81
Browsing and deleting data ........................82
8.4 Setting D/A Output ........................... 83
8.5 Adjusting Screen Contrast ............... 84
8.6 Adjusting Backlight Brightness......... 84
8.7 Changing Power Frequency
Setting
(Power Frequency Setting Function) ... 85
8.8 Initializing Settings (Reset)............... 86
Default setting list .......................................87
8.9 Checking Instrument Information ..... 88
9 External Control (EXT I/O) 89
9.1 Switching Current Sink (NPN) /
Current Source (PNP) ...................... 90
9.2 External Input/Output Terminals
and Signals ...................................... 90
Instrument-side connector and mating
connectors ..................................................90
Instrument-side connector pin assignment .91
Functions of each of the signals .................93
9.3 Timing Chart..................................... 94
From when measurement starts to
when judgment result is acquired ...............94

Contents
iii
12 Maintenance and
Service 133
12.1 Troubleshooting.............................. 133
Q&A (Frequently Asked Questions) ..........133
Error display and solution .........................136
12.2 Inspection,Repair and Cleaning .... 138
Appendix Appx.1
Appx. 1 Internal Circuits................... Appx.1
Appx. 2 Changes in Current
Running through Insulator .. Appx.2
Appx. 3 Countermeasures Against
Noise................................... Appx.3
Appx. 4 Using Instrument with
2000 V or Higher Voltage
Applied (With External
Power Supply) .................... Appx.6
Appx. 5 Assembling Switching Unit
for Object to Be Measured.. Appx.7
Connecting objects to be measured and
the switching unit to the instrument .....Appx.7
Selecting relays to be installed in the
switching unit .......................................Appx.8
Circuit diagram of the switching unit ....Appx.9
Including current-limiting resistor
(protective resistance) and relay..........Appx.9
Current-limiting resistor......................Appx.10
Appx. 6 Modifying Measurement
Lead.................................. Appx.11
Appx. 7 Mounting Instrument in
Rack.................................. Appx.13
Appx. 8 Dimensional Diagram ....... Appx.15
Index Ind.1
10
9
8
7
6
5
4
3
Appx. Ind.
12
11

Contents
iv

1
Introduction
Introduction
Thank you for purchasing the Hioki SM7420 Super Megohm Meter. To obtain maximum
performance from the instrument, please read this manual rst, and keep it handy for future
reference.
Target audience
This manual has been written for use by individuals who use the product in question or who teach
others to do so. It is assumed that the reader possesses basic electrical knowledge (equivalent to
that of someone who graduated from the electrical program at a technical high school).
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.
Notati
Concerning Safety
In this manual, the risk seriousness and the hazard levels are classied as follows.
DANGER
Indicates an imminently hazardous situation that will result in death or serious injury
to the operator.
WARNING
Indicates a potentially hazardous situation that may result in death or serious injury
to the operator.
CAUTION
Indicates a potentially hazardous situation that may result in minor or moderate
injury to the operator or damage to the instrument or malfunction.
IMPORTANT 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.

2
Notati
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 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
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.
Others
*Additional information is presented below.
SET
(Bold character) Operation keys are displayed in bold.
[ ] Names on the screen are indicated with brackets [ ].
Accuracy
We dene measurement tolerances in terms of f.s. (full scale), rdg. (reading), and dgt. (digit) values
with the following meanings:
f.s. (maximum display value or scale range)
The currently selected range.
rdg. (reading or displayed value)
The value currently being measured and indicated on the measuring instrument.
dgt.
(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-signicant digit.

3
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 specications, contact your authorized Hioki
distributor or reseller.
Main unit and accessories
Conrm that these contents are provided.
Model SM7420 Super Megohm Meter Instruction Manual
Male connector for EXT I/O Power cord
CD (Communications Command Instruction Manual,
USB driver)*
* The latest version can be downloaded from our
website.

4
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. 10.
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/1.8 m)
Model 9638 RS-232C Cable
(9pin-25pin/1.8 m)
Model 9151-02 GP-IB
Connector Cable
(2 m)

5
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-8302 Electrode for Surface
Resistance
Model SME-8310 Plate Sample Electrode 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 SM9001 Surface/Volume Resistance
Measurement Electrode
Model SR-2 Standard Resistor
Temperature and humidity sensor
Model Z2011 Humidity Sensor

6
Measurement Procedure
Measurement Procedure
Be sure to read “Operating Precautions” (p. 8) beforehand.
Installing, connecting, and turning on the instrument
Install the instrument. (p. 9) Connect the measurement lead
and electrode to the instrument.
Connect the temperature
and humidity sensor to
the instrument.
Connect the power cord
to the instrument.
Use the EXT I/O.
Communicate with the computer
through USB, RS-232C, or GP-IB.
Turn on the instrument.
Connect the power cord to the instrument. (p. 27)
Connect the measurement lead, electrode, and the
Humidity Sensor to the instrument. (p. 28)
Connect other devices to the instrument via the
external interface (as needed).
•Use the EXT I/O. (p. 90)
•Connect a computer to the instrument for communications
through USB, RS-232C, or GP-IB. (p. 109)
Turn on the instrument. (p. 31)
(It takes at least 30 minutes to complete a warm-up.)
Setting the instrument (p. 33)
Set the measurement conditions (as needed).
•Basic setting (p. 33)
•Customized setting for measurement conditions (p. 43)
•Setting related to the system (p. 79)
•Default setting table (p. 87)
Starting the measurement
Execute the open correction. (p. 52)
If contact check is set to ON, execute the open correction.
Connect the measurement lead to an object to be
measured. (p. 38)
Start the measurement. (p. 39)
Check the measured values. (p. 39)
Press the STOP key to end the measurement. (p. 39)
If the trigger source setting is set to [EXTERNAL], the measurement automatically stops on completion
of each measurement.
Ending
Turn off the instrument. (p. 31)

7
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.
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)
TOutlet
CAT II
Internal Wiring
Distribution Panel
Service Entrance
Service Drop
CAT IV
Power Meter
CAT III
Fixed Installation

8
Operating Precautions
Operating Precautions
Follow these precautions to ensure safe operation and to obtain the full benets 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 specied 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, conrm 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
WARNING
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
CAUTION
•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.

9
Operating Precautions
Installing the instrument
To prevent overheating, be sure to leave the specied clearances around the instrument.
•Install with the bottom surface facing downward.
•Vents must not be obstructed.
10 mm or more
Rear
50 mm or more50 mm or more
15 mm or more
“Unfolding and retracting the stands” (p. 18)
Handling the instrument
DANGER
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.
CAUTION
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.

10
Operating Precautions
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 specications of this
instrument, connect the power cord provided only to an 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.
Before connecting the measurement leads and electrode to the instrument
WARNING
•Do not use the instrument with circuits that exceed its ratings or specications.
Doing so may damage the instrument or cause it to become hot, resulting in
electric shock.
•The maximum rated to-ground voltage of the input terminal is 2000 V DC. Do
not apply any higher voltage input to the input terminal.
•Use only the specied measurement lead. If using a measurement lead other
than the one specied, you cannot perform measurement safely.
•To avoid electric shock, do not exceed the lower of the ratings shown on the
instrument and measurement 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 specied
in “Specications of Model Z2011 Humidity Sensor” (p. 123).

11
Operating Precautions
Before performing a measurement
WARNING
•While measuring insulation resistance, dangerous voltage is applied to the
measurement terminals. To avoid electric shock, do not touch the tip of 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.
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. 4 Using Instrument with 2000 V or Higher Voltage Applied (With External Power
Supply)” (p. Appx.6).
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
Be sure to connect the external case of the shielding box to the ground.
In addition, take sufcient precautions to avoid an electric shock.
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.
Remove the measured object after the dangerous voltage has been discharged.

12
Operating Precautions
Before controlling the instrument externally
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, or EXT I/O terminal are properly isolated.
CAUTION
You must not operate the EXT I/O MODE switch (NPN/PNP) while the instrument is
turned on.
Select the external I/O mode between NPN and PNP based on devices that are
externally connected (p. 90).
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 different
ground circuits will result in a potential difference between the instrument’s ground
and the computer’s ground. If the communications cable is connected while such a
potential difference 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 off 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
WARNING
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.

13
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.

14
Operating Precautions

15
1Overview
1.1 Product Overview and Features
This instrument is an insulation resistance meter containing a highly sensitive ammeter.
Employing the triaxial BNC connector enables the instrument to measure high resistance such as
resistance of insulators with no inuence of exogenous noise. The maximum measurement voltage
is 2000 V.
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: 50 Ωto 2 ×1019 Ω; Current measuring range: 0.1 fA to 2 mA
•Because temperature and humidity can be measured simultaneously, change in resistance can
be checked with the change in temperature and humidity.
•The contact check function enables you to perform stable measurements.
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.
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
1 Overview
1
Overview