3291
CLAMP ON HiTESTER
INSTRUCTION MANUAL
February 2008 Revised edition 1 Printed in Japan
3291A981-01 08-02H
HEAD OFFICE
Alternating current (AC)
MAX MAX value
Data hold function
FILTER Filter ON
Bar graph
OVER Over range
Battery low warning (4 levels)
Clamp Sensor
Barrier
Lever
Display (LCD)
PRESS ONCE
PRESS 2SEC
DATA HOLD
BACK LIGHT
PRESS ONCE
PRESS 2SEC
DIGITAL DISPLA Y
FILTER OFF/ON
PRESS ONCE
PRESS 2SEC
MAXIMUM DATA
POWER OFF
(Magnified View)
* The device considers the maximum
displayed value to be the MAX value.
81 Koizumi, Ueda, Nagano 386-1192, Japan
TEL +81-268-28-0562 / FAX +81-268-28-0568
E-mail: os-com@hioki.co.jp URL http://www.hioki.com/
HIOKI USA CORPORATION
6 Corporate Drive, Cranbury, NJ 08512, USA
TEL +1-609-409-9109 / FAX +1-609-409-9108
Introduction
Thank you for purchasing the HIOKI “Model 3291 CLAMP ON
HiTESTER.” T o obtain maximum performance from the product,
please read this manual first, and keep it handy for future reference.
Overview
Because it employs a small, thin-model sensor the 3291
CLAMP-ON HiTESTER can clamp even in nar row places. It is
constructed so th at the pos ition of the dis play ca n be cha nged
to suit the measuring location, and the back light makes it easy
to use even in dark places.
Inspection
Initial 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 ge ntly with a soft cloth moistened with water or mild det ergent. Never use solvents such
as benzene, alcohol, acetone, ether, ketones, thinners or
gasoline, as they can deform and discolor the case.
• If the protective functions of the product are damaged, either
remove it from service or mark it clearly so that others do not
use it inadvertently.
• If the product seems to be malfuncti oning, cont act your dealer or
Hioki representa tive.
Safety
This manual contains information and warnings essential for
safe operation of the product and for maintaining it in safe operating condition. Before using it, be sure to carefully read the following safety precautions.
This product 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 product. 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
product defects.
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 man-
ual (marked with the symbol) before using t he re lev an t
function.
Indicates AC (Alternating Current).
Indicates that the instrument may be connected to or dis-
connected from a live circuit.
Indicates a double-insulated device.
The following symbols in this manual indicate the relative importance of cautions and warnings.
Indicates that incorrect operati on pres en ts an extreme
hazard that could resul t in s erious injur y or de ath to the
user.
Indicates that incorrect op eration present s a sig nific ant
hazard that could resul t in s erious injur y or de ath to the
user.
Indicates that incorrect operation presents a possibility
of injury to the user or damage to the device.
Indicates advisory item s rel a ted to pe rfo rm anc e o r cor rect o per ati o n o f
the product.
Notation of the This Manual
Indicates a prohibit ed act ion .
Measurement categories (Overvoltage categories)
This product com pl ies w i th CAT II I 6 00 V, CAT IV 300 V saf ety re qui rements. To ensure safe operat ion of me asurem ent pro duct s, IEC 61010
establishes s af e t y sta n dar ds f or v ar i ou s el ec tr ic al e nv ir on me nts, c at e gorized as CAT I to CAT IV, and called measurement categories.
These are defined as follows.
CAT I: Secondary electrical circuits connected to an AC el ec trical out-
let through a transformer or similar device.
CAT II: Primary electrical circuits in equipment connected to an AC
electrical outlet by a power cord (portable tools, household
appliances, etc.)
CAT III:Primary electrical circuits of heavy equipment (fixed installa-
tions) connected directly to the distribution panel, and feeders
from the distribution panel to outlets.
CAT IV:The circuit from the service drop to the service entrance, and
to the power meter and primary overcurrent protection device
(distribution panel).
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 product in an environment designated with a
higher-numbered category than that for which the product is rated could
result in a severe accident, and must be carefully avoided.
Never use a CAT I measuring product in CAT II, III, or IV environments.
The measurement categories comply with the Overvol tage Categories
of the IEC60664 Standards.
Usage Notes
Follow these precautions to ensure safe operation and to obtain
the full benefits of the various functions.
• Do not allow the product to get wet, and do not take
measurements with wet hands. This may cause an
electric shock.
• Do not store or use the product where it could be exposed to
direct sunlight, high temp erature or humidity, or condensation. Under such conditions, the product may be damaged
and insulation may deteriorate so that it no longer meets
specifications.
• This instrument contains a magnetic core. The device
should not be used by anyone with a pacemaker or any other
electronic medical devices installed in his body.
Names and Functions of Parts
Functions
Grasping the lever and opening wide the CLAMP SEN-
Power ON/OFF
Measurement Value
HOLD
Maximum Measured
Value Display
Filter
Backlight
Display Reversing
Remaining Battery
Display
SOR causes the power to turn on automatically.
Pressing the POWER OFF key for 2 seconds or longer
turns the power off.
Press the key once to hold the present measurement value for reading. Press it once again to release
the hold. Release data hold using FILTER ON/OFF.
Press the MAX key once to turn on the MAX va lue display.
The device returns to standard measurement display
after approximately 15 seconds.
Please refer to "Regarding the MAX value display".
Pressing the FILTER key for 2 seconds or longer.
When set to ON, the filter removes noise and other
unwanted frequency components.
The backlight can be turned ON/OFF by pressing the
key for 2 seconds or longer
The display reverses automatically with the opening
and closing of the main body. The display can also be
reversed by pressing the key once.
Displays 4 levels of remaining battery charge.
The power automatically turns off when the displayed value
is “0” for one minute. The power will turn off automatically
Auto Power Off
after 5 minutes even if the data hold state continues.
Y ou can disable the auto-power off function by pressing
the key while turning on the device.
Specific ations
Measurement specifica tion
• Tempera ture and humidity for guaranteed accura cy: 23±5°C
(73±9°F), 80%RH or less.
• Guaranteed accurac y period: 1 year, opening and cl osing of
the Clamp Sensor 10,000 times, whichever comes first.
• Guaranteed accuracy range: 5.40 A or above
AC current A rms (true rms indication, Auto range）
Range
60 A 5.40 A to 60.00 A
600 A 54.0 A to 600.0 A 54.0 A to
1000 A 540 A to1000 A 540 A to
Effect of conductor
position
Maximum rated
voltage to earth
Crest facto r 2.8 (up to 600 A), 1.6 (greater than 600 A)
Diameter of measur-
able conductor
Temperature coeffi-
cient
Response time 1.5sec. max.
Maximum input current
Guaranteed
accuracy
Display
range
0.06 A to
60.00 A
600.0 A
1000 A
Within±5.0% (in any position based on the center of
the clamp sensor)
600 Vrms (CAT III)
300 Vrms (CAT IV)
30 mm dia. max.
0.05 × precision specification / °C
0 to 40°C (32 to 104
1000 A
Minimum
resolution
0.01 A
0.1 A
1 A
FILTER ON FILTER OFF
rdg.±5dgt.
(50 Hz to 60 Hz)
°F
)
* rdg. (reading or dis played value), dgt. (resolution)
General Specifications
Details of operation
Filter
Auto holding of measured values
MAX value display
Power supply control
Auto power-off
Battery Level
Indicator
Back light
Display update rate
Liquid crystal display (LCD) reversal
Display LCD: monochrome, 91 segments
Operating
temperature and
humidity
Storage te mper ature
and humidity
Location for use Altitude up to 2000 m (6562 feet), indoors
Rated supply voltageDC3 V × 1
Initial setting: OFF (Always OFF when the power supply is
turned on; non-filtered data is not saved)
Activate/De-activate: Press FILTER key for 2 seconds or
longer.
Details of operation: Holds displayed values (data update
is halted)
Activate/De-activate:
Details of operation: Displays the maximum value reached
since the power has been turned on. Displays the maximum bits as a bar graph
Activate: Pressing the MAX key once
De-activate: Function will automatically de-activate after
maximum value is displayed for 15 seconds. Manual ly deactivate the MAX function by pressing the MAX key once
after the MAX value display has been cleared.
Clear displayed maximum value: Power OFF, or press the
MAX key once while the maximum value is being displayed.
ON: Open the CLAMP SENSOR wide (sideways).
OFF: Press POWER OFF key for 2 seconds or longer.
Details of operation: The power cuts off when "0" is displayed continuously for 1 minute.
Power also cuts off when the device is in Dat a Hold mode
continuously for 5 minutes.
To de-activate: Power ON while pressing the key.
(non-filtered data is not saved)
Details of operation: Remaining battery power shown as
zero at 2.0 V (±0.1 V)
Power automatically turns off at 1.8 V (±0.1 V)
Setting
method: Press key for 2 s
Digital display: 500 ms±25 ms (approx. 2 times / second)
Bar graph display: 250 ms±12.5 ms (approx. 4 times / second)
Details of operation: Automatically reverses when the display panel is opened and closed.
Manual reversal: Pressing the key once
0 to 40°C ( 32 to 10 4°F ), 80 % R H or less
(with no condensation)
-10 to 50°C
（
with no condensatio n
: Cutoff frequency :180 Hz±30 Hz (-3dB)
Pres sing the key once.
(50.0 to 122. 0° F), 8 0% R H o r less
)
Accuracy
±1.5%
econds or longer.
±2%rdg.±5dgt.
(45 to 66 Hz)
±3%rdg.±5dgt.
(66 Hz to 400 Hz)
Maximum rated
1. Clamp the tester on the conductor, so that the conductor
passes through the center of the c la mp cor e. Cla mp th e
tester on one wire only.
2. The effective value is shown on the digital display.
OK
Display example
MAX key
MAX key
Measurement
Value Display
Clear MAX value
MAX Value
Display
Approximately 15 seconds
(the MAX value is stored)
key
Take measurements with the display
panel flipped open in order to view the
measurement results more clearly, especially in tight locations, without needing
to twist the jaw at an awkward angle.
Display Panel
The display can also be
the key.
reversed by pressing
Replacing the B a tteries
1.
Press and hold the POWER OFF key for 2 seconds or
longer to turn off the de vice's p owe r.
2.
Remove the battery cover screws on the back of the device
with a Phillips screwdriver, then remove the battery cover.
3. Replace with a new battery. When inserting a new battery
(CR2032 lithium battery), be sure to position the polarities
in their proper orientations.
4. Replace the battery cover and fasten the screws.
Battery c o ve r
Tighten
Loosen
Position the battery
side is on top.
so that the plus (+)
CALIFORNIA, USA ONLY
This product contains a CR Coin Lith ium Battery w hich contains
Perchlorate Material - special handling may apply.
See www.dtsc.ca.gov/hazardouswaste/perchlorate
power
Power supply CR2032 x 1 Lithium battery
Battery lifetime
Dimensions and
mass
Dielectric strength
Applicable standards
Accessories
25 mVA
Approx.10 hours（continuous, no load）
Approx. 50 W × 136 H × 26 D mm
(1.97”W×5.35”H×1.02”D)
Approx. 90 g (3.2 oz.)
5312 Vrms /15sec., 5 mA sensitivity current between the
chassis and clamp core
Safety EN61010, Measurement category III (600 V),
EMC EN61326
9757 CARRYING CASE, Strap*, CR2032 Lithium battery,
Instruction Manual, Basic operat ion instruction s sticker (in
Japanese, Chinese, Korean and Italian)
*Attach as required
IV (300 V) (anticip at ed tr ansie nt ove rvoltage 6000
V) Pollution degree 2
Measurement Procedures
Pre-Operation Inspec tion (Check the following before using the product.)
• Before using the produ ct the firs t time, verify tha t it operates
normally to ensure that the no damage occurred during storage or shipping. If you find a ny dam age, contact y our dealer
or Hioki representative.
• The clamp sensor or the case shall be free of damage. (If
damage has occu rred, avoid usi ng the
product under these conditions may result in electric shock.)
• The mating portions of the clamp sensor shal l mate pr operly.
The mating portions of the clamp sensor should also be
free of any scratches or cracks.
• Battery power should be near full capacity when power is
turned on. (The mark will appear when the batteries are
low. Accurate measurement is no t possible whe n the batteries are low.)
• The reading should be a round 0 A usin g the current fu nction
when no measurements are being made.
• This product should only be connected to the secondary side of a breaker, so the breaker can prevent an
accident if a short circuit occurs. Connections should
never be made to the primary side of a breaker,
because unrestricted current flow could cause a serious accident if a short circuit occurs.
• To avoid electric shock, do not touch the portion
beyond the protective barrier during use.
• Be careful to avoid d ropping the product o r otherwise subjecting them to me ch ani ca l s ho ck , th e CL AM P S ENS O R ti p
will be damaged, negatively influencing measurement.
• Do not input current greate r th an 1 000 A. It wi ll dam age th e
device.
• Please note that waveforms that include elements outside the
frequency characteristic range may not be measured correctly.
• Correct measurement may be impossible in the p resence of
strong magnetic fi elds, such as near transforme rs and highcurrent conductors, or in the presence of strong el ectromagnetic fields such as near radio transmi tter s .
product. Use of the
AC Current Measurement
To avoid short circuits and potentially life-threatening hazards, never attach the product in current
measurement mode to a circuit that operates at
more than the maximum rated voltage CATIII 600 V,
CATIV 300 V, or over bare conductors.
Open Jaws to Power On.
• Press the key once when you want to freeze the displayed value for reading. (Data Hold function)
• Please note that the error margi n is large in mea su rements of
less than 3 A.
Regarding the MAX value display
(1) Press the MAX key once to confirm the MAX value. If the MAX value is
renewed, the new value will be displayed as the MAX value. After
approximately 15 seconds the device will return will return to normal
measurement display and the MAX value will be saved.
(2) Y ou can clear the MAX value by pressing the MAX key while the MAX value
is being displayed.
The MAX value is cleared with FILTER ON/OFF.
Opening and Closing the Display Panel
Adjust the angle of the display panel for bett e r viewing.
Replacing Battery
• To avoid electric shock when replacing the battery first
disconnect the clamp from the object to be measured.
After replacing the batteries, replace the cover and
screws before using the product.
• Use only CR2032 lithium battery. Use of any other battery may result in explosion.
• Be sure to insert them with the correct polarity. Otherwise, poor performance or damage from battery leakage
could result.
• 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.
• Keep batteries away from children to prevent accidental
swallowing.
• To avoid corrosion from battery leakage, remove the batteries from the product if it is t o be stored for a l ong time.
• The current battery conditi on is shown by the mark in
the upper left of the dis pl ay. The mark will appear when
the batteries are low. Accurate measur ement is not possible
when the batteries are low. Replace the new batteries soon.
• The batteries included with t he device were installed for factory testing purposes. CR2032 lithium batteries can be purchased at electron ic s and ap pli an ce s tores wh er e s pe cial iz ed
batteries are sold.
Regarding the Basic Operation Instructions sticker
Afix the included Basic Operation Instructions sticker (in Japanese, Chinese, Korean and Italian) to the device as necessary.
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