Hioki 3118 Instruction Manual

INSTRUCTION MANUAL

3118

November 2002 Revised edition 1

3118A981-01 02-11H Printed in Japan

Introduction

Thank you for purchasing the Hioki 3118 M Ω HiTESTER. To obtain
maximum performance from the product, please read this manual first,
and keep it handy for future reference.

Specifications

Operating
temperature and
humidities

0to40 (32 t o 10 4 ), 90% RH max
(with no condensations)

Storage temperature
and humidities

-10 t o 50 (-4 t o 12 2 ), 90% RH max
(with no condensations)

Operating
environment

Altitude up to 2000 m (6562 feet)

Power source

Rated power voltage: 1.5 VDC X 6,
R6P manganese battery X 6
External power (DC8 .5 V/600mA, MAX. 10 V)

Maximum rated power

4VA

Continuous operating
time

Approx. 8 ho urs a t 500 V, 1 MΩ
(using mannganese batteries)

Dielectric strength

3 kVAC 50/60 Hz for one minute
Between electric circuit and case

Dimensions
(excluding protrusions)

106W X 145H X 52D mm approx.

4.17"W X 5.71"H X 2.05"D approx.

Mass

500 g, (17.6 oz.) approx. (including batteries)

Accessories

9294 TEST PROBE
9363 CARRYING CASE (3118-11)
9364 CARRYING CASE (3118-12)
Instruction Manual, Instruction label
R6P manganese battery X 6, Spare fuse

Option

9288 BREAKER PIN, 9289 TEST PROBE,
9257 CONNECTION CORD

Model 3118-11 3118-12

Rated voltage 250 V 500 V 500V 1000 V

Maximum effective

reading

50 MΩ 100 MΩ 200 MΩ 2000 MΩ

1st effective

measurement

range

0.05 to 20 MΩ 0.1 to 50 MΩ 0.1 to 50 MΩ 2to500MΩ

5% of scale reading

2nd effective

measurement

range

20 to 50MΩ 50 to 100MΩ 50 to 200MΩ 500 to 2000MΩ

10% of scale reading

Other accuracy

0.7% of scale length

(including 0 and reading)

Measurement

terminal voltage

accuracy

10% of rated voltage at infinity

90% min. of rated voltage at 1 MΩ
(3118-12: 1000 V range at 20 MΩ )

Effective of

temperature

(0 to 40 )

5% of scale reading plus basic allowance at 1 MΩ

(3118-12: 1000 V range at 20 MΩ )

0.7% of scale length plus basic allowance at 0 and

Measurement
current (when

short-circuited)

3.4 mA 0.32 mA

Response time

3 s or less at 1 MΩ or 0

(3118-12: 1000 V range at 20 MΩ )

Overload

protection

(measurement

terminal)

280 V rms 600 V rms 600 V rms 1100V rms

Discharge function Yes No Yes No

Resistance range

and accuracy

0to100Ω/ 3% of scale length

Effective of

temperature

(0 to 40 )

3% of scale length plus basic allowance

Open terminal

voltage

310 mV max.

Overload

protection

250 V rms

(Fuse protection: 1 A/250 V with non-arcing type）

AC voltage range

and accuracy

0 to 600 V

7% of maximum scale value (50/60 Hz)

Effective of

temperature

(0 to 40 )

7% of maximum scale value

Input resistance Approx. 160 kΩ Approx. 3.3 MΩ

Overload

protection

700 V rms

Safet

y

・

The

symbol printed on the product 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 product.

Indicates that dangerous voltage may be present at this
terminal.

Indicates AC (Alternating Current).

Indicates DC (Direct Current).

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 product.

NOTE

Advisory items related to performance or
correct operation of the product.

Notes on Use

DANGER

Before connecting probes to the product, check that the
probes are d isconnected from the object to be measured.

WARNING

To avoid electric shock, do not al low the product to get
wet, and do not use it when your hands are wet.
Before using the product, make sure that the
insulation on the probes is undamaged and that no
bare conductors are improperly exposed. Using the
product in such conditions could cause an electric
shock. Replace the test probes with the specified
Hioki Model 9294.
Do not use the product where it may be exposed to
corrosive or c ombustible gases. The product may be
damaged or cause an explosion.

CAUTION

Do not store or use the product where it could be exposed to
direct sunlight, high temperature or humidity, or condensation.
Under such conditions, the product may be damaged and
insulation may deteriorate so that it no longer meets
specifications.
To avoid damage to the product, protect it from vibration or
shock during transport and handli ng, and be especially careful
to avoid dropping.

Fuse and BatteryReplacement

WARNING
To avoid electric shock when replacing the batteries,
first disconnect the test probes from the object to be
measured. Before using the product after replaci ng
the batteries, replace the cover and screw.
Do not mix old and new batteries, or different types of
batteries. Also, be careful to obser ve battery polarity
during installation. Otherwise, poor performance or
damage from battery leakage could result.
To avoid the possibility of explosion, do not short
circuit, disassemble or incinerate batteries.
Keep batteries away from children to prevent
accidental swallow ing.
Replace the fuse only with one of the specified
characteristics and voltage and current ratings. Using
a non-specified fuse or shorting the fuse holder may
cause a life-threatening hazard.
Fuse type: MF51NR1-S 1 A, 250 V (non-arc ing) 20 mm
X5mmdia.

Battery cover

Spare fuse

Inspection

When you receive the product, inspect it carefully to ensure that no
damage occurred during shipping. If damage is evident, or if it fails to
operate according to the specifications, contact your dealer or Hioki
representative.

Maintenance and Service

To clean the product, wipe it gently with a soft cloth moistened with
water or mild detergent. Never use solvents such as benzene, alcohol,
acetone, ether, ketones, thinners or gasoline, as they can deform and
discolor the case.
If the product seems to be malfunctioning, confirm that the batteries are
not discharged, and that the test probes are not open circuited before
contacting your dealer or Hioki representative.
Pack the product carefully so that it will not be damaged during
shipment, and include a detailed written description of the problem. Hioki
cannot be responsible for damage that occurs during shipment.

General Specifications

Specifications

Guaranteed at 23 5 (73 9 ), 90% RH or less, for 1 year.

This manual contains information and warnings essential for safe
operation of the product and for maintaining it in safe operating condition.

Before using the product, be sure to carefully read the following safety

notes.

Safety Symbols

The following symbols in this manual indicate the relative importance of
cautions and warnings.

NOTE

Before use check that batteries are charged. Replace the old batteries
with fresh one if they are low.
When not in use for a long time , to prevent possible corrosion caused
by battery leakage, remove the batt eries before storage.
Always release the MEASURE button after use.
The meter display is glass, so avoid subjecting it to strong impacts.
This product is provided with a label containing measurement
instruction and precautions. After purchase, be sure to fix this label to
the battery cover on the back of the product.
Before use, check whether the product operates properly. You can do
this by performing Insulation Resistance Measurement, then pressing
the MEASURE button in the MΩ setting (the indicator should read
zero).
If the needle remains in the position, the fuse has blown. In this case,
replace the fuse with a new one of the same rating (refer to "Fuse and
Battery Replacement").

1. Rotate the dec orative sc rew with a
coin or similar object.

2. Remove the battery cover.

3. Insert six new batteries.
If the fuse has blown, replace it
with a new one.

Names and Functi ons of Parts

1

2

3

7

5

10

8

9

6

11

12

13

4

Measurement Procedure

WARNING
Observe the follow ing to avoid electric shock and short
circuits.

Do not attempt to measure insulation resistance on a
live conductor. D oing so could damage the product or
cause an accident that might result in injury or death.
Always turn off power to the conductor being
measured before sta rting.
The maximum pe rmissible input is indicated in the
specifications. Do not measure voltage in excess of
these limitations, as doing so may damage the
product or cause an accident that might result in
injury or death .
When measuring i nsulation resistance, dangerous
voltage is a pplied to the measurement termi nals. To
avoid electric shock, do not touch the probe.
To avoid electrical shock, never touch the external
power input terminal and BATT.CHECK terminal while
measuring insulation resistance.

CAUTION

When discharging, do not set the function selector to the Ω
position. It may result in damage to the product.

1

2

3

4

Source
(primary
side)

Load
(secondary side)

Always turn off the breaker
or the measurement LINE.

EARTH terminal

LINE terminal

Circuit to be measured

-

+

3118

ON

OFF

MEASURE button

Low voltage MΩ

Ω

ACV

Function selecto

r

Discharge
resistance

High voltage MΩ

Capacitance

3118

Core

Mete

r

Power
suppl

y

LINE

EARTH

GUARD

Insulato

r

Sheathings

DANGER
Test probes should only be connected to the secondary
side of a breaker, so the breaker can pre vent an accident
if a short circuit occurs. Connections should never be
made to the pri mary side of a breaker, because
unrestricted current flow could cause a serious accid ent
if a short circui t occurs.
The maximum permissible input is 700 Vrms.
Attempting to measure voltage in excess of the
maximum rating cou ld destroy the product and result
in personal injure or death.
To avoid electrical shock, never touch the external
power input terminal and BATT.CHECK terminal while
measuring voltage.
To avoid electrical shock, be careful to a vo id shorting
live lines with the test probes.

WARNING
Never press the MEASURE button while measuring
voltage. Doing so could damage the circuitry or cause a
life-threatening accident.

1

3

Do not press the
MEASURE button.

Always connect the probe
to the secondary side of
the breaker.

Source
(primar

y

side

)

Load

(

secondaryside

)

2

DANGER
Never apply voltage to test probes when the Resistance
function is selected. Doing so may damage the product
and result i n personal injury.
To avoid electrical accidents, remove power from the
circuit before m easuring.

BatteryCheck Method

1

2

Do not press the
MEASURE button.

Usingthe CarryingCase

Hook

9288 BREAKER PIN

Option

DANGER

To avoid electrical shock, be careful to a vo id shorting
live lines with the breaker pin.

1. MEASURE button

Press to measure insulation resistance.

2. Zero-ajustment 3. Di splay and scale 4. Indicator needle

5. Function selector (Ω/ACV/MΩ)

6. Earth measurement terminal

Connect the EARTH probe (black).

7. Guard terminal

8. Battery check terminal

Use with LINE probe.

9. DC IN: External power supply jack (DC8.5 V/600mA, MAX. 10 V, has
φ5 mm-dia.-ter minals and has a center pin with negative polarity)

10. Line measurement terminal

Connect the LINE probe (red).

11. Battery cover 12. decorative screw

13. Instruction label (fix the label here)

Insulation Resistance Measurement

1. Set the f unction selector to either MΩ position.
(3118-11: 250/500 V, 3118-12: 500/1000 V)

2. Connect the black EARTH probe to the ground side of the object
being measured.

3. Connect the red LINE probe to the LINE to be measured.

4. Press the MEASURE button. (To make continuous measurements,
pull the button up.)

5. Read th e valu e aft er th e needle has stabil ized.

NOTE

Insulation resistance is the ratio of leakage current to input voltage,
and is therefore unstable. Depending on the circuit being measured
the needle may stabilize, but this in not a meter malfunction.
When measuring insulation between c ommunication cables or other
systems with a capacitance element, the needle will move first quickly
to the left, then gradually return to the right, and it may take some t ime
to become stabilized. This is not a sign of malfunction. Read the
value after the needle has stabilized.

Discharge Function

When measuring an insulation resistance that contains a capacitance
element, that element will be charged with an electric load proportional
to the measurement voltage.
After measuring a circuit with capacitance, release the MEASURE
button and set the f unction selector to 250 V (3118-11) or 500 V
(3118-12) before detaching the probes. This will activate the 3118
built-in discharge circuit.

The time required for discharge depends on the capacitance value. As
a reference, observe the indicator needle. During discharge, it will go
beyond, then return gradually. discharge is practically completed when
needle reaches the

symbol.

Make it a practice t o discharge the subject conductor after measurement.

Guard terminal use

The guard terminal
eliminates the effects of
test object surface leakage
resistance to measure
only volumetric resistance.

For measurement of
cables and similar objects,
as indicated in the
diagram, wrap a bare wire
(about 0.5 mm in diameter) around the insulator to be measured and
connect this to the GUARD terminal. The leakage current flowing
through the surface of the insulator will not be displayed, making it
possible to accurately measure volumetric resistance.

AC Voltage Measurement

1. Set the function selector to ACV.

2. Connect the black EARTH probe to the ground.

3. Connect the red LINE probe to the line to be measured.

4. Read the voltage value on the AC scale after the needle stabilizes.

Resistance Measurement

1. Set the function selector to Ω.

2. Press the MEASURE button and attach the LINE and EARTH probes.

3. Read th e res istance value on the Ω scale.

1. Set the function selector to B CH.

2. Connect the LINE probe tip to the BATT CHECK terminal.

3. If the needle is within the B range, the batteries can be used. If it is
to the outside of the B range, replace the batteries with new ones.

For use, fold the cover back as shown.
Attach the belt to the hook as indicated when carried from your shoulder.

Remove the hook if the product is to be used while hung aroud your
neck. Carry probes here. Carry the 9288 BREAKER PIN (option) here.

9288 BREAKER PIN

Attach this to the tip of the LINE probe or pin
type EARTH probes. It allows the tip to be
extended, when other wise it would be too short
to ma ke a measurement.

9289 TEST PROBE

The black EARTH probe is a pin type probe like
the LINE probe. This can not be attach to the 9288 BREAKER PIN.

9257 CONNECTION CORD

The black EARTH probe is a clip type probe like the LINE probe.