Hioki 3293-50 User manual

Introduction
Thank you for purchasing the HIOKI Model 3293-50 CLAMP ON LEAK
HiTESTER. To obtain maximum performance from the product, please
read this manual first, and keep it handy for future reference.
The 3293-50 Clamp On Leak HiTester is a small sized, thin-type sensor
that can measure current between a wide 1 mA to 1000 A range. In ad-
dition, the angle of the display panel can be adjusted to suit the mea-
suring location, and the back light makes the product easy to use even
in dark places.
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.
• To clean the product, wipe it gently with a soft cloth moistened with
water or mild detergent. Never use solvents such as benzene, alco-
hol, 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 malfunctioning, contact your dealer or
Hioki representative.
This manual contains information and warnings essential for
safe operation of the product and for maintaining it in safe oper-
ating condition. Before using it, be sure to carefully read the fol-
lowing safety precautions.
Safety Symbol
Other Symbols
Symbols for Various Standards
The following symbols in this manual indicate the relative importance
of cautions and warnings.
Measurement categories
This product complies with CAT III 300 V safety requirements. To ensure safe
operation of measurement products, 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 an AC
electrical outlet by a power cord
(portable tools, household appli-
ances, etc.)
CAT II covers directly measuring
electrical outlet receptacles.
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).
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.
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 care-
fully avoided.
Follow these precautions to ensure safe operation and to obtain the full
benefits of the various functions.
Measurement specification
• Temperature and humidity for guaranteed accuracy: 23±5°C (73±9°F),
80%RH or less.
• Guaranteed accuracy period: 1 year, or opening and closing of the
Clamp Sensor 10,000times, whichever comes first.)
• Guaranteed accuracy range: 1.00 mA or above
AC current A rms (true rms indication, Auto range)
0.05 mA or less zero-suppression
We define measurement tolerances in terms of rdg. (reading) and dgt. (digit) val-
ues, with the following meanings:
rdg. (reading or displayed value)
The value currently being measured and indicated on the measuring product.
dgt. (resolution)
The smallest displayable unit on a digital measuring product, i.e., the inputvalue
that causes the digital display to show a "1" as the least-significant digit.
General Specifications
Functions
Pre-Operation Inspection
(Check the following before using the product.)
•
Before using the product the first time, verify that it operates
normally to ensure that the no damage occurred during stor-
age or shipping. If you find any damage, contact your dealer
or Hioki representative.
•
The clamp sensor or the case shall be free of damage. (If
damage has occurred,
avoid using the product. Use of the
product under these conditions may result in electric shock.)
•
The mating portions of the clamp sensor should be free of
any scratches or cracks.
•
Battery power should be near full capacity when power is turned
on. (Refer to “Replacing Battery”.)
•
The reading should be around 0 A using the current function
when no measurements are being made.
Overview
Inspection
Maintenance and Service
Safety
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. However, using the product 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 product defects.
3293-50
CLAMP ON LEAK HiTESTER
Instruction Manual
January 2012 Revised edition 1
Printed in Japan
3293C981-01 12-01H
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 AC (Alternating Current).
Indicates DC (Direct Current).
Indicates that the instrument may be connected to or disconnected
from a live circuit.
Indicates a double-insulated device.
Indicates a prohibited action.
This symbol indicates that the product conforms to safety regula-
tions set out by the EC Directive.
WEEE marking:
This symbol indicates that the electrical and electronic appliance is
put on the EU market after August 13, 2005, and producers of the
Member States are required to display it on the appliance under
Article 11.2 of Directive 2002/96/EC (WEEE).
Indicates that incorrect operation presents an extreme hazard
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 product.
Usage Notes
Do not allow the product to get wet, and do not take measure-
ments 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 temperature or humidity, or condensation.
Under such conditions, the product may be damaged and insu-
lation 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
Specifications
Range Guaranteed
accuracy Resolution Accuracy
FILTER ON FILTER OFF
30 mA 1.00 mA to 30.00
mA 0.01 mA
±1.5%rdg. ±5dgt.
(50 Hz to 60 Hz)
±1.5%rdg. ±5dgt.
(45 Hz to 66 Hz)
±3.0%rdg. ±5dgt.
(66 Hz to 400 Hz)
300 mA 27.0 mA
to 300.0 mA 0.1 mA
6 A 0.270 A
to 6.000 A 0.001 A
60 A 5.40 A
to 60.00 A 0.01 A
600 A 54.0 A
to 600.0 A 0.1 A
1000 A 540 A
to 1000 A 1 A
Effect of conductor
position :Within ±0.1% (up to 6 A range), Within±5.0%
(greater than 60 A range)
(in any position based on the center of the clamp sensor)
Maximum rated voltage
to earth : 300 Vrms, Measurement category III (anticipated transient overvoltage 4000 V)
Crest factor : 2.8 or less (up to 600 A), 1.68 or less (1000 A range)
Diameter of measurable
conductor
: 24 mm dia. or less
Temperature coefficient :Within 0.05 × precision specification / °C
Other than 23°C±5°C (73
°F±9°F )
Magnetic field
interference : Maximum 7.5 mA in an external magnetic field of AC 60 Hz 400 A/m (
up to 6 A range)
Response time :1.1 sec. or less
Maximum input current
:1000 A (Refer to Fig. 1)
Example Calculation
Accuracy spec :±1.5%rdg. ±5dgt.
Measurement range :60.00 A
Measurement values :30.00 A
(A)Reading error （± %rdg.）: ± 1.5% of 30.00 A =
± 0.45 A
(B)Digit error （± dgt.）: ± 5dgt. =± 0.05 A (Due to
minimum resolution of 0.01 A)
(C)Total error: (A)+(B) = ± 0.50 A
The limit error value for the measured value of
30.00 A is 29.50 A ～30.50 A based on the total
error (C).
Clamp Sensor
Barrier
Lever
Display (LCD)
Press Once
Press 2 sec.
• Data Hold
• Back Light
PRESS Once
PRESS 2 sec.
• Digital Display
• Filter OFF/ON
Press Once
Press 2 sec.
• Maximum Data
• Power OFF
(Magnified View) Alternating current (AC)
MAX MAX value
Data hold function
FILTER Filter ON
Bar graph
Over range
Battery low warning (4 levels)
* The device considers the maximum
displayed value to be the MAX value.
Press both
• Clear MAX value
• I nstantaneous value
Display update rate 1.1 sec. or less
Display LCD: monochrome, 91 segments
Operating
temperature and
humidity
0 to 40°C (32 to 104°F), 80%RH or less
(with no condensation)
Storage temperature
and humidity -10 to 50°C
(14.0 to 122.0°F), 80%RH or less
（ with no condensation )
Location for use Indoors, Pollution degree 2,
Altitude up to 2000 m (6562 feet)
Rated supply voltage 3 VDC × 1
Maximum rated
power 25 mVA
Power supply CR2032 x 1 Lithium battery
Battery lifetime Approx.18 hours
(continuous, no load, at
23°C ）
Dimensions
Approx. 50W × 130H × 26D mm (1.97”W×5.12”H×1.02”D)
Mass Approx. 135 g (4.8 oz.)
Dielectric strength
3536 Vrms /15sec.
5 mA sensitivity current between the chassis and clamp core
Applicable standards Safety EN61010
EMC EN61326
Accessories 9757 Carrying Case, Strap, Instruction Manual,
CR2032 Lithium battery
Power supply control ON : Grasping the lever and opening wide the Clamp Sensor (sideways).
OFF: Press POWER OFF key for 2 seconds or longer.
Filter
Details of operation : Low pass filter OFF/ON
Cutoff frequency :180 Hz±30 Hz (-3dB)
Initial setting: ON (Always ON
when the power supply is
turned on; non-filtered data is not saved)
Activate/De-activate: Press FILTER key for 2 seconds
or longer.
*When set to ON, the filter removes noise and other
unwanted frequency components.
Data hold
Details of operation: Holds measured values (data
update is halted)
Activate:
Pressing the key once.
De-activate:Pressing the key once.
FILTER OFF/ON
MAX value display
Details of operation: Displays the maximum measured
values reached since the power has been turned on.
Activate/De-activate: Pressing the MAX key once.
Clear displayed maximum value: P
ress the MAX key and
HOLD key at the same time. Filter OFF/ON
Auto power-off Details of operation: The power cuts off when "0" is
displayed continuously for 1 minute.
Any key operation is not performed for appro
x.10 minutes.
To de-activate: Power ON while pressing the key.
Battery Level
Indicator Details of operation: Displays 4 levels of remaining
battery charge.
*Refer to “Replacing Battery”.
Back light Setting
method: Press key for 2 s econds or longer.
(About 15 seconds lighting.)
*Frequent use of backlight reduces battery life.
Liquid crystal display
(LCD) reversal
Details of operation: Automatically reverses when the
display panel is opened and closed.
Manual reversal: Pressing the key once.
*Refer to “Opening and Closing the Display Panel”.
Bar graph Shows the proportion of the measured value to the
range.
Over range display Over-Range Display: Displays “OVER” when a high
crest factor current is inputted, which means an out of
the accuracy guarantee.
*Refer to “Crest factor”.
Measurement Procedure

Crest factor
“Crest factor = Waveform peak value/ Internal rated range” is defined for this
instrument. There are cases when the accurate measurement cannot be per-
formed with our previous models, because a top portion of the waveform is
clipped off due to the rated range if a high crest factor current (= RMS is low
and a waveform peak is high) is flowed. This instrument defines the range
based on a waveform peak value and measured value so that the accurate
measurement can be performed. As for a high crest factor current, its mea-
sured value becomes small to the range. If a current exceeding a crest factor
of 2.8 is inputted,“OVER”is displayed. This measurement is the out of accu-
racy guarantee range and the measured value is for reference purpose only.
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) You can clear the MAX value by pressing the MAX key while the MAX value
is being displayed.
(3) When opening and closing the clamp sensor frequently, a large display
count may remain on the MAX value display. When measuring for the
maximum value, clamp onto the conductor and clear any residual
maximum values before conducting your test.
Open Jaws to Power On.
Filter function
(1) The default setting of Filter is ON. Please change the setting according to
the use.
(2) Normally, load current is measured with Filter OFF and leak current is mea-
sured with Filter ON.
1.Clamp the tester on the conductor, so that the conductor
passes through the center of the clamp sensor. For measure-
ment of grounded wires, clamp the tester on one wire only
(see a). For overall measurements, clamp the tester on the
entire circuit path (see b).
2.The effective value (RMS) of the leak current is shown on the
digital display. The selected current range is shown at the
bottom of the display.
Adjust the angle of the display panel for better viewing.
Fix the strap for fall prevention.
When an error is displayed on the LCD, the HiTester requires
repair. Contact your supplier or Hioki representative.
• This product should only be connected to the second-
ary 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 acci-
dent if a short circuit occurs.
• To avoid electric shock, do not touch the portion
beyond the protective barrier during use.
• Be careful to avoid dropping the clamps or otherwise sub-
jecting them to mechanical shock, the Clamp Sensor tip will
be damaged, negatively influencing measurement.
• Do not input a current exceeding the maximum allowable
current. Doing so will make the clamp sensor generate heat,
which may damage the product and cause burn.
• Please note that waveforms that include elements outside the frequency
characteristic range may not be measured correctly.
• Accurate measurement may be impossible in the presence of strong
magnetic fields, such as near transformers and high-current conduc-
tors, or in the presence of strong electromagnetic fields such as near
radio transmitters.
Fig 1. Maximum allowable current for frequency
Previous models 3293-50
• As far as the Data Hold mode is on, MAX value can not be updated.
• The MAX value is cleared with FILTER OFF/ON.
AC Current Measurement
To avoid short circuits and potentially life-threatening haz-
ards, never attach the product in current measurement
mode to a circuit that operates at more than the maximum
rated voltage CAT III 300 V, or over bare conductors.
• Correct measurement may be impossible for the case of rush current
or significantly fluctuating current.
• As for the measurement on 6 A or more, the error margin might be
larger depending on the positioning of the conductor and sensor.
• When the measuring value exceeds 1000 A the digital display will
blink.
• Waveforms around 20 Hz or below may be displayed as “----”.
• At a low temperature, there are cases when the reading may not be
around 0 A without any input signal. But it does not affect measure-
ment.
Leak Current Measurement
OK
1. Clamp the tester on the conductor so that the conductor passes
through the center of the clamp core.
• Put the conductor perpendicular to the sensor, as shown in the sketch.
• Clamp the tester on one wire only.
2. The effective value is shown on the digital display.
Display example
single-phase 3-wire circuits
Transformer
lg
b
b
a
clamp all three wires of the circuit
Load
device
E(PE)
Load
lg
b
b
a
three-phase 3-wire circuits clamp all three wires of the circuit
device
E(PE)
a
PE
Ig: leak Current
• For measurement of single-phase 2-wire circuits, clamp both
wires of the circuit.
• For measurement of three-phase 4-wire circuits, clamp all four
wires of the circuit. If this is not possible, the measurement can
also be carried out on the ground wire of the equipment.
• Do not input current that exceeds the maximum continuous
input of the electric current range.
• Measurement may not be accurate in the cases below.
(1) When there is large current (of about 100 A) flowing through
a nearby electric line.
(2) When using the 3293-50 to measure special waveforms,
such as those on the secondary side of an inverter
• Note that a large display count may appear momently when
opening or closing the clamp sensor. This is not an error. It
may take some time for the display to return to zero. However,
starting measurement before the display returns to zero will
not affect measurement.
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 bat-
tery may result in explosion.
• Be sure to insert them with the correct polarity. Other-
wise, poor performance or damage from battery leak-
age 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 bat-
teries from the product if it is to be stored for a long time
• at the upper left on the display screen indicates the remaining
power level. When the battery approaches the exhausting value,
is displayed and a few minutes later, power turns off automat-
ically. When is displayed, the accuracy of measurement value
is not guaranteed. Replace the new batteries soon.
• At a low or high temperature, the battery life is reduced faster.
• The batteries included with the device were installed for factory test-
ing purposes. CR2032 lithium batteries can be purchased at elec-
tronics and appliance stores where specialized batteries are sold.
Regarding the Auto Power Off Function
If themeasured current remains at 0 ampere for 1 minute or no key
is pressed for 10 minutes, power turns off automatically.
When measuring leakage current, if you wish to disable the Auto
Power Off function, turn the device's power on while pressing the
HOLD key. Press the POWER OFF key for 2 seconds or longer to
turn the device off.
CALIFORNIA, USA ONLY
This product contains a CR Coin Lithium Battery which contains
Perchlorate Material - special handling may apply.
See www.dtsc.ca.gov/hazardouswaste/perchlorate
Opening and Closing the
Display Panel
Attaching the strap
Error Display
Error Display Meaning Remedial Action
Err0 Internal ROM Error Repair is necessary. Contact your
supplier or Hioki representative.
Err1
Err2 Calibration Data Faulty
Err3
Replacing the Batteries
Battery cover
Position the battery
side is on top.
Tighten
Loosen
so that the plus (+)
1. Press and hold the POWER OFF key for 2 seconds or
longer to turn off the device's power.
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.
The display can also be
key
Display Panel
the 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.
reversed by pressing
Make the strap go through the
hole just like the Figure shown.