Hioki 3273 User manual

INSTRUCTION MANUAL
CLAMP ON PROBE
3273

Contents
Introduction i
Inspection i
Safety Notes i
Note on Use iv
Chapter 1 Overview 1
1.1 Product Overview 1
1.2 Features 1
1.3 Names of Parts 2
1.4 Parts of the Sensor 3
Chapter 2 Specifications 5
2.1 Product Specifications 5
2.2 Standards Applying 7
Chapter 3 Measurement Procedure 9
3.1 Notes on Use 9
3.2 Preparations for Measurement 13
3.3 Demagnetizing and Zero Adjustment 14
3.4 Measurement Procedure 16

i
____________________________________________________
Introduction
___________________________________________
WARNING
This device is designed to comply with IEC
61010-1 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 device.
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 device defects.
Introduction
Inspection
Safety Notes
Thank you for purchasing the HIOKI "3273 CLAMP
ON PROBE". To obtain maximum performance
from the device, please read this manual first, and
keep it handy for future reference.
When you receive the device, 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.
Supplied accessories
Instruction manual 1
Soft case 1

ii
____________________________________________________
Safety Notes
___________________________________________
The symbol printed on the device
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
device.
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 device.
NOTE Indicates advisory items related to
performance or correct operation of the
device.
Safety Symbols
This manual contains information and warnings
essential for safe operation of the device and for
maintaining it in safe operating condition. Before
using the device, be sure to carefully read the
following safety notes.
The following symbols in this manual indicate the
relative importance of cautions and warnings.

iii
____________________________________________________
Safety Notes
___________________________________________
Overvoltage Categories (CAT)
This device conforms to the safety requirements for CAT I
measurement instruments.
To ensure safe operation of measurement instruments, IEC
60664 establishes safety standards for various electrical
environments, categorized as CAT I to CAT IV, and called
overvoltage categories. These are defined as follows.
CAT I : Secondary electrical circuits connected to an AC
electrical outlet through a transformer or similar
instrument.
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 installations) 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 instrument (distribution
panel).
Higher-numbered categories correspond to electrical
environments with greater momentary energy, so a
measurement instrument designed for CAT III
environments can endure greater momentary energy than
one 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.

iv
____________________________________________________
Note on Use
___________________________________________
DANGER
To avoid short circuits and potentially life-
threatening hazards, follow these precautions.
Never attach the 3273 to a circuit that operates
at more than 300V, or over bare conductors.
While the core section is open, and when
conductors being measured carry in excess of
the safe voltage level (SELV-E) and not more
than 300 V, make sure that conductors to be
measured are insulated with material
conforming to (1) Overvoltage Category I,(2)
Basic Insulation Requirements for Working
Voltages of 300 V, and (3) Pollution Degree 2.
For safeties sake, never use this sensor on
bare conductors. The core and shield case are
not insulated.
Be careful to avoid damaging the insulation
surface while taking measurements.
Note on Use
Follow these precautions to ensure safe operation
and to obtain the full benefits of the various
functions.

v
____________________________________________________
Note on Use
___________________________________________
DANGER
This device is made for use with the 3272
POWER SUPPLY. It is possible to use a power
supply other than the 3272, provided that the
connector and pin assignments match, and that
voltage and other electrical specifications are
satisfied. In the interest of safety, make sure
that the power supply has a protective earthing
with double-insulation construction.
Make sure that the waveform measuring
equipment connected to this device's output
terminal (BNC) is equipped with a protective
earthing with double-insulation construction.
To avoid electric shock, do not touch the
portion beyond the barrier during use.
If the waveform measuring instrument being
connected to the output terminal (BNC) on this
device is equipped with any other measurement
terminals, take the following precautions to
ensure that the other instrument does not form
a bridge between the probe and any hazardous
live of a part.
1. Isolate the terminal to which the probe is
connected from other terminals on the
measuring instrument using basic insulation
conforming to the overvoltage category,
working voltage, and pollution degree
requirements of the circuit being tested.

vi
____________________________________________________
Note on Use
___________________________________________
DANGER
2. If basic insulation requirements cannot be
met between the terminal to which this device
is connected and other terminals of the
measuring instrument, make sure that the
voltage input to the measurement terminal
does not exceed the safe voltage level (SELV-
E).
3. Read and observe all warnings and
precautions relating to electrical safety for the
measuring instrument being connected to the
probe.
Refer to the following standards regarding the
meanings of underlined terms.
IEC61010-1
IEC61010-2-031
IEC61010-2-032

vii
____________________________________________________
Note on Use
___________________________________________
DANGER
Be sure to observe all operating precautions for
the waveform monitoring instrument
(oscilloscope or recorder) and other
measurement instruments to which this device
is connected
When using a measurement instrument that
does not provide isolation between its input
terminals and chassis or other input terminals,
please pay attention to the following points.
If a signal is applied to an input terminal other
than that to which this device is connected, do
not connect the ground-side terminal to any
non-ground potential. Otherwise, short-circuit
current will flow through the 3272 or this device
from the ground terminal, which could cause an
electrical accident or damage.

viii
____________________________________________________
Note on Use
___________________________________________
WARNING
Do not allow the device to get wet, and do not
take measurements with wet hands. This may
cause an electric shock.
CAUTION
To avoid damage to the device, protect it from
vibration or shock during transport and handling,
and be especially careful to avoid dropping.
Do not store or use the device where it could be
exposed to direct sunlight, high temperature or
humidity, or condensation. Under such conditions,
the device may be damaged and insulation may
deteriorate so that it no longer meets
specifications.
Before using the device 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.
This device is not designed to be entirely water- or
dust-proof. To avoid damage, do not use it in a wet
or dusty environment.
The sensor head is a precision assembly including
a molded component, a ferrite core, and a Hall
effect element. It may be damaged if subjected to
sudden changes in ambient temperature, or
mechanical strain or shock, and therefore great
care should be exercised in handling it.

ix
____________________________________________________
Note on Use
___________________________________________
CAUTION
The matching surfaces of the sensor head are
precision ground, and should be treated with care.
If these surfaces are scratched, performance may
be impaired.
Measurements are degraded by dirt on the mating
surfaces of the sensor head, so keep the surfaces
clean by gently wiping with a soft cloth.
To avoid damaging the sensor cable and power
supply cable, do not bend or pull the cables.
When the power is on, keep the core section of the
sensor closed, except when clamping them onto
the conductor to be measured. The facing surface
of the core section can be scratched while it is
open.
NOTE
Correct measurement may be impossible in the
presence of strong magnetic fields, such as near
transformers and high-current conductors, or in
the presence of strong electromagnetic fields such
as near radio transmitters.

x
____________________________________________________
Note on Use
___________________________________________
Service / Maintenance
To clean the device, 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 damage is suspected, contact your dealer or
Hioki representative.
When sending the device for repair, pack
carefully to prevent damage in transit. Include
cushioning material so the 3273 cannot move
within the package. Be sure to include details of
the problem. Hioki cannot be responsible for
damage that occurs during shipment.

1
____________________________________________________
Chapter 1 Overview
_______________________________________________
Chapter 1
Overview
1.1 Product Overview
1.2 Features
This device can be directly connected to a BNC
input connector of a waveform measuring
instrument such as an oscilloscope or recorder, and
by clamping on a conductor to be measured, allows
the current waveform to be easily captured.
Highly accurate current detection
Easy current measurement
Broadband frequency characteristics DC to 50
MHz
Compact and permits measurement of low current
levels
Easy protect function at excessive input
Unique HIOKI development of thin film Hall
effect element

2
____________________________________________________
Chapter 1 Overview
_______________________________________________
3
6
7
4
5
1
2
Current direction
indication
Power supply
cable
Sensor cable
Sensor Terminator
"UNLOCK" indication
8
1.3 Names of Parts
External view

3
____________________________________________________
Chapter 1 Overview
_______________________________________________
1.4 Parts of the Sensor
1. Opening lever
Operating lever for opening the sensor head. Always
use this lever to open the sensor head.
2. Sensor head
This clamps the conductor being measured, and
carries out the actual current measurement. It is a
precision assembly including a molded component, a
ferrite core, and a Hall effect element. It may be
damaged if subjected to sudden changes in ambient
temperature, or mechanical strain or shock, and
therefore great care should be exercised in handling
it.
3. Demagnetizing switch (DEMAG)
This demagnetizes the core if it has been magnetized
by switching the power on and off, or by an excessive
input. Always carry out demagnetizing before
measurement.
The demagnetizing process takes about one second.
During demagnetizing, a demagnetizing waveform is
output.
4. Zero adjustment dial (ZERO ADJ)
Use the zero adjustment dial to correct for the effect of
a voltage offset or temperature drift on the device.
When beginning measurement, after demagnetizing
always carry out zero adjustment.
5. Coarse adjustment trimmer
Use this only when adjustment is not possible within
the range of the zero adjustment dial. Use a
nonconductive screwdriver (e.g., ceramic driver) for
adjustment.

4
____________________________________________________
Chapter 1 Overview
_______________________________________________
NOTE
6. Output connector
The current waveform of the measured conductor is
output at a constant rate (0.1 V/A).
Connect to the BNC input connector of the waveform
measuring instrument.
The output of this device is terminated internally.
Use a high-impedance input to the measuring
instrument. With an input impedance of 50Ω,
accurate measurement is not possible.
If using BNC-banana plug adapters or similar to
connect to input terminals other than BNC
connectors, make sure the polarity is correct.
Turn the collar until it clicks, and check that it is
locked securely.
7. Power plug
Connect this to the 3272 POWER SUPPLY
receptacle to supply power to the sensor terminator.
8. Barrier
This structure reduces the likelihood of touching the
conductor while testing, and indicates the limit of
safe physical contact. Avoid touching the clamp in
front of the barrier when clamping or measuring.

5
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Chapter 2 Specifications
_______________________________________________
Frequency
range
DC to 50 MHz (-3 dB) (Characteristics
shown in Fig. 1)
Rise time 7nsorless
Maximum
continuous input
range
15 A
Derating according to frequency shown
in Fig. 2
Maximum peak
current value
Non-continuous 30 A peak; at pulse
width 10µs, 50 A peak
Output voltage
rate
0.1 V/A
Amplitude
accuracy
0.5% rdg. 1mV
(DC, and 45 to 66 Hz, input within
continuous maximum input range)
Noise Equivalent to 2.5 mA rms or less (for 20
MHz band measuring instrument)
Input impedance (Characteristics shown in Fig.3)
Temperature
coefficient for
sensitivity
2% or less (within a range of 0 to 40
, within a range of 32 to 104 )
Chapter 2
Specifications
2.1 Product Specifications
Guaranteed at 23 ±5(73 ±9) after the
power has been on for 30 minutes.

6
____________________________________________________
Chapter 2 Specifications
_______________________________________________
Maximum rated
power
3VA
Rated supply
voltage
12 V 1V
Operating
temperature and
humidity range
0to40 (32 to 104 ), 80 %RH or
less (no condensation)
Storage
temperature and
humidity range
-10 to 50 (14 to 122 ), 80 %RH or
less (no condensation)
Location for use Indoor, altitude up to 2000 m (6562 feet)
Period of
guaranteed
accuracy
1 year (Opening/Closing up to 10,000
times)
Effect of
external
magnetic fields
Equivalent to a maximum of 20 mA (in
a 60 Hz,400 A/m AC current magnetic
field)
Maximum rated
voltage to earth
300 V, CAT I (insulated conductor)
Diameter of
measurable
conductors
5mmdia.
0.2" dia.
Cable lengths Sensor cable Approx. 1.5 m (59.0")
Power supply cable Approx. 1 m (39.4")
External
dimensions
Sensor
Approx. 175Wx18Hx40Dmm
Approx. 6.89"Wx0.71"Hx1.58"D
Terminator
Approx. 27Hx55Wx18D mm
Approx. 1.06"Wx2.17"Hx0.71"D