Hioki 3120 Instruction Manual
December 2013 Revised edition 5
Printed in Japan
3120A981-05 13-12H
3120
VOLTAGE
DETECTOR
Instruction Manual
Safety
Detecting
element
×
○
Barrier
Position the detect hing e leme nt
so that it is parallel to the object.
Voltage detection is not
performed properly.
The red LED does not light up
or the buzzer does not sound.
The red LED and buzzer
sound are getting off.
The red LED lights up
and the buzzer sounds.
OK
NG
3. Grip the 3120 firmly and apply the
detecting element to a known power
supply
(e.g., AC outlet) in order to check the
performance.
The object cannot perform voltage
detection. (It is not live or the earth
potential is below the measurementvoltage range (70 V or less).)
The batteries are running
The 3120 is operating
The 3120 may be malfunctioning.
properly. It can be used.
Do not use it.
The object is live.
low. Replace the batteries.
NG
OK
2. Turn the switch ON.
(Turn it clockwise.)
The green LED lights up. The green LED does not light up or is dim.
Switch
NG
The batteries are running
low. Replace the batteries.
The red LED lights up and the buzzer sounds.
Detection
The green LED is still lig ht ing up.
Turn on the switch. In the state that the green
LED is lighting up, apply the detecting element
to the object to be measured. If there are several wires, conduct a voltage check of each wire
separately.
(Check some points for bundle of wires.)
Performance Check
1. Inspect the 3120 carefully to e nsure tha t no da mage.
There is no damage. The 3120 is damaged.
Be sure to check the following before use to avoid electrical
Contact your dealer or Hioki representative.
OK
NG
shock.
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.
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. Using the instrument in a way not
described in this manual may negate the provided safety
features. 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.
Usage Notes
Follow these precautions to ensure safe op eration and to obtai n
the full benefits of the various functions.
• This instrument is designed for use indoors. It can be operated at temperatures between 0 and 40°C without degr ading
safety.
• This instrument is not designed to be entirely water- or dus tproof. Do not use it in an especially dusty environment, nor
where it might be splashed with liquid. This may cause damage.
• To avoid damage to the instrument, protect it from physical
shock when transporting and handling. Be especially c areful
to avoid physical shock from dropping.
Warranty
Warranty malfunctions occurring under conditions of normal
use in conformity with the Instruction Manual and Product Precautionary Markings will be repaired free of charge. This warranty is valid for a period of three (3) years from the date of
purchase. Please contact the distributor from which you purchased the product for further information on warranty provisions.
Introduction
Thank you for purchasing the HIOKI “Model 3120 VOLTAGE
DETECTOR.” To obt ain maximum performan ce from the instrument, please read this manual first , and k eep it handy fo r future
reference.
Overview
This noncontact type of voltage detector unit enables the hotline state of AC voltage to be c hecked through the wire or cab le
covering.
Initial Inspection
When you receive the instrument, 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 instrument, 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 instrument seems to be malfunctioning, confir m that the
batteries are not discharged, before co nt acting yo ur dealer or
Hioki representative.
Safety Symbol
In the manual, the symbol indicates particularly important
information that the user should read before using the instrument.
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.
Indicates a double-insulated device.
Indicates AC (Alternating Current).
The following symbols in this manual indicate the relative importance of cautions and warnings.
Indicates that incorrect operat ion presen ts an extreme h azard that could result in serious injury or death to the user.
Indicates that incorrect operation presents a significant
hazard that could result in serious injury or death to the
user.
Indicates that incorrect operation presents a possibility of
injury to the user or damage to the device.
Indicates advisory items related to performance or correct
operation of the instrument.
Measurement categories
This instrument complies with CAT IV (1000 V) safety requirements. To ensure safe operation of measurement instruments,
IEC 61010 establishes safety standards for various electrical
environments, categorized as CAT II to CAT IV, and called measurement categories.
CAT II : Primary electrical circuits in equipment connected to
CAT III :Primary electrical circuits of heav y equi pment (fixed in-
CAT IV: The circuit from the service drop to the service en-
Using a measurement instrument in an env ironment 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.
Use of a measurement instrument that is not CAT-rated in CAT
II to CAT IV measurement applications could result in a severe
accident, and must be carefully avoided.
an AC electrical outlet by a power cord (port able tools,
household appliances, etc.)
CAT II covers directly measuring electrical outlet receptacles.
stallations) connected directl y to the distribut ion panel,
and feeders from the distribution panel to outlets.
trance, and to the power meter and primary overcurrent protection device (distribution panel).
A weak green light indicates dead battery. Replace the batteries
immediately.
Detection
Performance Check and Voltage Detection
The maximum rated voltage between input terminals and
ground is 1000 VAC. Attempting to measure voltages
exceeding 1000 V with respect to ground could damage
the instrument and result in personal injury.
• The green LED indicates battery consumption but is not a
guarantee of the performance of the instrument. Be sure to
check its performance using a known power source (e.g., AC
outlet) prior to use.
• The 3120 voltage detector works using a live AC circuit. It will
not work using an earthed wire or neutral point. If there are
several lines, such as 2-phase wires and 3-phase wires, perform voltage detection on each line separately.
• The 3120 cannot perform voltage detection on a shielded wire.
• Be sure to grip the 3120 firmly during measurement. But, do
not touch the portion beyond the barrier. It will not produce
any detection.
• Make sure the detecting element properly contacts the object
to be measured. (See the right figure.)
3120 VOLTAGE DETECTOR
The red LED lights up and the
buzzer sounds.
Only the green LED lights up.
Object to be Measured
Live.
Not live or below the measurement-voltage
range (70 V or less).
Replacing the batteries
1
2
3
①
②
Turn the switch off.
Press and hold down the switch,then turn it.
counterclockwise to remove the switch section.
Replace the old battery with a new
4
Install the switch section back
into place by holding it down
Replacing the batteries
one. Confirm correct polarity when
installing the new battery .
and turning clockwise.
This mark
should be
[
OFF
].
MEMO
Specifications
• After replacing the batteries, replace the switch section
before using the instrument.
• Battery may explode if mistreated. Do not short-circuit,
recharge, disassemble or dispose of in fire.
• Handle and dispose of batteries in accordance with local
regulations.
• Do not mix old and new batteries, or different types of batteries. Also, be careful to observe battery polarity during
installation. Otherwise, poor performance or damage from
battery leakage could result.
• Use R03 manganese battery or LR03 alkaline battery.
• After use, always turn OFF the power.
Basic Specifications
Measurement function Detection
Measurement voltage
Measurement frequency 50/60 Hz
Pilot light
Battery check
Power supply
Dimensions
Mass
Operating environment Indoors, altitude up to 2000 m (6562-ft.)
Operating temperature and
humidity range
Storage temperatu re and
humidity range
Accessories
Standards Safety
applying
70 to 1000 VAC (when in contact with an
2
or equivalent insulated wire)
IV2mm
The red LED lights up and the buzzer
sounds when the wire is live.
The green LED is dim or out when the batteries
are low.
Two R03 manganese batteries or Two
LR03 alkaline batteries.
Approx. 149H 18.5 mm (5.87”H
0.73”) (excluding projections)
Approx. 38 g (1.3 oz.)
(including two R03 manganese batteries)
0 to 40°C (32 to 104
(with no condensation)
-20 to 60°C (68 to 140°F), 80%RH max.
(with no condensation)
Instruction manual
Two R03 manganes e batteri es (For mon itor built into the main unit)
EN61010 degree2,
Measurement category IV 1000 V
(anticipated transient overvoltage 12000 V)
EMC
EN61326
°F
), 80%RH max.
Electrical Specifications
Maximum rated voltage to
earth
Dielectric strength 13.18 kVrms
Rated supply voltage
Operating supply-voltage
range
Maximum rated power
Rated power
Continuous operating time
1000 VAC
1.5 VDC 2
From 3.45 V to the voltage at which the
green LED goes out (central value: 2.1 V)
170 mW (Max) Power supply voltage 3.0
VDC
27 mW (Typ) Power supply voltage 3.0
VDC (Power ON Standby state)
R03 manganese batteries: Approx.100
hours
LR03 alkaline batteries : Approx.200 hours
(Power ON Standby st ate)
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