Hioki 3143 User manual

3143
EARTH HiTESTER
INSTRUCTION MANUAL

Contents
Introduction i
Inspection i
Safety Notes ii
Notes on Use vi
Chapter 1 Outline 1
1.1 Product Outline 1
1.2 Features 2
1.3 Names and Functions of Parts 4
Chapter 2 Specifications 7
Chapter 3 Measurement Procedure 11
3.1 Measurement Preliminaries 12
3.2 Measuring method 13
Chapter 4 Technical Information 19
4.1 About Ground Resistance 19
4.2 Principle of Conventional Measurement
of Ground Resistance
(Fall-of-Potential Method) 21
4.3 Principle of Measurement on Which
This Instrument is Based 22
4.4 Comparison of Values Measured
by Conventional Ground Resistance
Meters (Fall-of-Potential Method)
and Model 3143 24

4.5 Sample Measurement
(Measurement of Ground Resistance
for Overhead Telecommunications
Equipment and Various Types
of Protectors) 26
Chapter 5 Precautions concerning
Measurement 29
Chapter 6 Maintenance and Service 31
6.1 9338 CARRYING CASE 31
6.2 Replacing the Batteries 32
6.3 Cleaning the Product 34
6.4 Service 34

i
―――――――――――――――――――――――――――
Introduction
――――――――――――――――――――――――
Introduction
Inspection
Thank you for purchasing the HIOKI 3143
EARTH HiTESTER. To obtain maximum
performance from the instrument, please read
this manual first, and keep it handy for future
reference.
When you receive the instrument, inspect it
carefully to ensure that no damage occurred
during shipping. In particular, check the
accessories, panel knob, and connectors. If
damage is evident, or if it fails to operate
according to the specifications, contact your
dealer or Hioki representative.
Accessories
9216 CABLE WINDER (with 9265)
9265 MEASUREMENT CABLE
(Lead line (Black) 1 m, Return line
(Red) 20 m)
9338 CARRYING CASE
Instruction Manual
LR6 alkaline batteries (four)

ii
―――――――――――――――――――――――――――
Safety Notes
――――――――――――――――――――――――
WARNING
This instrument is designed to comply with IEC
61010 Safety Standards, and has been thoroughly
tested for safety prior to shipment. However,
mishandling during use could result in injury or
death, as well as damage to the instrument. Be
certain that you understand the instructions and
precautions in the manual before use. We
disclaim any responsibility for accidents or
injuries not resulting directly from instrument
defects.
The symbol printed on the instrument
indicates that the user should refer to a
corresponding topic in the manual
(marked with the symbol) before using
the relevant function.
In the manual, the symbol indicates
particularly important information that the
user should read before using the
instrument.
Indicates DC (Direct Current).
Safety Notes
Safety symbols
This manual contains information and
warnings essential for safe operation of the
instrument and for maintaining it in safe
operating condition. Before using it, be sure to
carefully read the following safety precautions.

iii
―――――――――――――――――――――――――――
Safety Notes
――――――――――――――――――――――――
DANGER
Indicates that incorrect operation
presents an extreme hazard that could
result in serious injury or death to the
user.
WARNING
Indicates that incorrect operation
presents a significant hazard that could
result in serious injury or death to the
user.
CAUTION
Indicates that incorrect operation
presents a possibility of injury to the
user or damage to the instrument.
NOTE Indicates advisory items related to
performance or correct operation of the
instrument.
The following symbols in this manual indicate
the relative importance of cautions and
warnings.
We define measurement tolerances in terms of
rdg. (reading) values, with the following
meanings:
rdg. (reading or displayed value)
The value currently being measured and
indicated on the measuring instrument.

iv
―――――――――――――――――――――――――――
Safety Notes
――――――――――――――――――――――――
Measurement categories (Overvoltage
categories)
This instrument complies with CAT I safety
requirements.
To ensure safe operation of measurement
instruments, IEC 61010 establishes safety
standards for various electrical environments,
categorized as CAT I to CAT IV, and called
measurement categories. These are defined as
follows.
CAT I: Secondary electrical circuits that are
connected to a wall outlet through a
transformerorsimilardevice.
CAT II: Primary electrical circuits in
equipment connected to a wall outlet
via a power cord (portable tools,
household appliances, etc.)
CAT III: Primary electrical circuits of heavy
equipment (fixed installations)
connected directly to the distribution
panel, and feeders between the
distribution panel and outlets.
CAT IV: The circuit from the service drop to
the service entrance, then to the
power meter and to the primary
overcurrent protection device.

v
―――――――――――――――――――――――――――
Safety Notes
――――――――――――――――――――――――
Higher-numbered categories correspond to
electrical environments with greater momentary
energy. So a measurement device designed for
CAT III environments can endure greater
momentary energy than a device designed for
CAT II.
Using a measurement instrument in an
environment designated with a higher-
numbered category than that for which the
instrument is rated could result in a severe
accident, and must be carefully avoided.
Never use a CAT I measuring instrument in
CAT II, III, or IV environments.
The measurement categories comply with the
Overvoltage Categories of the IEC60664
Standards.

vi
―――――――――――――――――――――――――――
Notes on Use
――――――――――――――――――――――――
Notes on Use
Follow these precautions to ensure safe
operation and to obtain the full benefits of the
various functions.
Preliminary Checks
Before using the instrument the first time,
verify that it operates normally to ensure
that the no damage occurred during storage
or shipping. If you find any damage, contact
your dealer or Hioki representative.
Before using the instrument, make sure that
the insulation on the measurement cables is
undamaged and that no bare conductors are
improperly exposed. Using the product in
such conditions could cause an electric
shock, so contact your dealer or Hioki
representative for replacements. (Model
9265)