Iwatsu SS-521 User manual

Instruction Manual
Current Probe
SS-520 / SS-521
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Ⓒ2021 IWATSU ELECTRIC CO., LTD. All rights reserved．

CONTENTS
Introduction.................................................................1
Verifying......................................................................1
Safety Notes...............................................................2
Usage Notes...............................................................5
1 Overview ............................................................23
1.1 Product Overview...................................................... 23
1.2 Features.................................................................... 24
1.3 Parts Names and Functions...................................... 25
1.4 Measurement Workflow ............................................ 30
2 Measurement Procedure....................................33
2.1 Inspection Before Use............................................... 33
2.2 Preparation for Measurements.................................. 35
Connecting the device to the Power Supply ............... 35
Performing Demagnetizing and Zero-Adjustment....... 37
2.3 Performing Measurements........................................ 41
3 Specifications.....................................................45
3.1 Product Specifications .............................................. 45
3.2 Functions .................................................................. 54
4 Maintenance and Service...................................57
4.1 Troubleshooting........................................................ 58
4.2 Error.......................................................................... 61
4.3 Cleaning.................................................................... 63
4.4 Discarding the Device............................................... 64

1
Precautions during shipment
•Use the original packing materials when transporting the
device, if possible.
•Transport the device in its carrying case.
Introduction
Introduction
Thank you for purchasing the IWATSU SS-520, SS-521
Current Probe. Toobtain maximum performance from the
device, please read this manual first, and keep it handy for
future reference.
Verifying
When you receive the device, inspect it carefully to ensure
that no damage occurred during shipping. In particular,
check the accessories, panel keys, and connectors. If
damage is evident, or if it fails to operate according to the
specifications, contact your dealer or IWATSU
representative.
Check the package contents as follows.
Model SS-520/SS-521CurrentProbe ··········1
Carrying case ·········································1
Instruction Manual···································1
Sheet for China RoHS······························1
Cable tie·················································1

Safety Notes
2
DANGER
WARNING
Options (sold separately)
The following options are available for the device. Contact
your authorized IWATSU distributor or reseller when
ordering.
•Model PS-54 Power Supply
•Model PS-52 Power Supply
Safety Notes
This device is designed to conform to IEC 61010 Safety
Standards, and has been thoroughly tested for safety prior to
shipment. However, using the device in a way not described
in this manual may negate the provided safety features.
Before using the device, be certain to carefully read the
following safety notes.
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.
With regard to the electricity supply, there are risks
of electric shock, heat generation, fire, and arc
discharge due to short circuits. If persons unfamiliar
with electricity measuring device are to use the
device, another person familiar with such devices
must supervise operations.

3
Safety Notes
Notation
In this manual, the risk seriousness and the hazard levels
are classified as follows.
DANGER
Indicates an imminently hazardous situation
that will result in death or serious injury to
the operator.
WARNING
Indicates a potentially hazardous situation
that may result in death or serious injury to
the operator.
CAUTION
Indicates a potentially hazardous situation
that may result in minor or moderate injury
to the operator or damage to the device or
malfunction.
Indicates information related to the operation
IMPORTANT of the device or maintenance tasks with
which the operators must be fully familiar.
Indicates a high voltage hazard.
If a particular safety check is not performed
or the device is mishandled, this may give
rise to a hazardous situation; the operator
may receive an electric shock, may get burnt
or may even be fatally injured.
Indicates prohibited actions.
Indicates the action which must be
performed.
* Additional information is presented below.
Bold Device’s keys are indicated in boldface.

Safety Notes
4
Indicates that only insulated conductors suited to the
voltage of the circuit under test can be measured.
Indicates cautions and hazards. When the symbol is
printed on the device, refer to a corresponding topic in
the Instruction Manual.
Indicates that the product conforms to regulations set
out by the EU 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).
rdg.
rdg. (reading or displayed value)
The value currently being measured and indicated
on the measuring device.
Symbols affixed to the device
Symbols for various standards
Accuracy
We define measurement tolerances in terms of rdg. (reading)
with the following meanings:
Revision History
•April 2021: 1st edition
KMLA00271

Usage Notes
5
DANGER
CAUTION
Usage Notes
Follow these precautions to ensure safe operation and to
obtain the full benefits of the various functions.
To avoid electric shock, do not remove the device's
cover. The internal components of the device carry
high voltages and may become very hot during
operation.
•Before using the device, make sure that the
insulation on the cord is undamaged and that
no bare conductors are improperly exposed.
Using the device in such conditions could
cause an electric shock, so contact your
dealer or IWATSU representative for repair.
•Before using the device, Verify that it operates
normally to ensure that no damage occurred
during storage or shipping. If you find any
damage, contact your dealer or IWATSU
representative.
Be careful to avoid dropping the device or otherwise
subjecting them to mechanical shock, which
could damage the facing surfaces of the core and
adversely affect measurement.
WARNING

Usage Notes
6
WARNING
CAUTION
Installation
For details on the operating temperature and humidity, see the “3
Specifications” (p. 45).
•Avoid the following locations that couldcause
an accident, fire, or damage to the device.
•Exposed to direct sunlight or high temperature
•Exposed to corrosive or combustible gases
•Exposed to water, oil, chemicals, orsolvents
•Exposed to high humidity or condensation
•Exposed to a strong electromagnetic field or
electrostatic charge
•Exposed to high quantities of dust particles
•.
•Near induction heating systems (such as high-
frequency induction heating systems and IH
cooking equipment)
•Susceptible to vibration
•Located near a device that uses high-
frequency power
Avoidobstructingtheventilationholesonthesides and
bottom of the terminator (p. 25), as it could overheat and
bedamaged, orcause a fire.
•Do not place the device on an unstable table or
an inclined place. Dropping or knocking down the
device can cause injury or damage to thedevice.

Usage Notes
7
To avoid shock and short circuits, turn off all
power before connecting the device.
WARNING
Precautions during preparation for measurements
•Before turning on the power, make sure that the
voltage of the power supply being used matches
the supply voltage indicated on the rear panel of
optional Model PS-54 or Model PS-52 Power
Supply.
•Check that the conductor being measured is not
clamped when supplying power to the device. A
demagnetizing waveform may be generated when
poweris supplied,causing damageto components
connected to the circuit being measured.
•Toavoid terminator (p. 25) damage, keep it
oriented ina straight line relative tothewaveform
measurement instrument when connecting and
disconnecting it.
•Toavoid damaging the output connector, pull
the unlock lever toward you and then pull the
connector out and away from the waveform
measurement instrument.
CAUTION

Usage Notes
8
•When connecting an input connector other than
a BNC connector, for example a conversion
plug, do so such that the BNC center conductor
is positive and other metallic parts are ground
potential (or negative).
Reference
•Device output is terminated internally. Since the output
resistance is 50 Ω, the device must be used with a
waveform measurement instrument (oscilloscope,
recorder, etc.) that has an input impedance of at least
1 MΩ. Accurate measurement is not possible with
waveform measurement instruments that have an input
resistance of 50 Ω.
•An AC voltage waveform may appear in the output
under certain circumstances, even under conditions
of no input, if the device is connected to the PS-54
or the PS-52 Power Supply while the power supply
is on. This does not indicate a malfunction. The AC
voltage waveform that appeared in the output will
disappear,
and operation restored to normal by opening and closing
the sensor head.
CAUTION

Usage Notes
9
*A phenomenon whereby the magnitude of the zero point error
component (offset voltage) varies over time.
Reducing the impact of offset drift*
•
Wait at least 30 minutes after turning on the device
before making measurements. Offset drift mayincrease
immediately after power is supplied to the probe due to
self-heating and other factors.
•
Offset drift will occur when the ambient temperature
changes or when the device is used to make continuous
measurements over an extended period of time, causing
measured values toinclude anerror component. Perform
demagnetization and zero-adjustment asnecessary.

Usage Notes
10
DANGER
Precautions during measurement
•Do not measure around a bare conductor.
Doing so may result in short-circuit or electric
shock. Take measurements at a location on an
insulated wire where there is sufficient
insulation for the circuit voltage.
•Refer to the derating characteristics when
measuring current that includes a high- frequency
component and never measure any current that
exceeds the rated current. Use with high
frequencies or strong magnetic fields may cause
the device to become abnormally hot, resulting in
fire, equipment damage, or burns. (See “3
Specifications” (p. 45).)
•Observe the following to avoid electric shock and
short circuits.
•Connect the device to the PS-54 or the PS-52
Power Supply and waveform measurement
instrument (oscilloscope or recorder) first, and
then to the active lines to bemeasured.
•When the sensor is opened, do not short- circuit
theconductorbeingmeasuredorother two wires
with the metal part ofthe tip.

Usage Notes
11
H
L
Power
Source
Load Load
•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. The device’s
reference potential is the ground potential. Do
not apply a different potential to the ground side
of other input connectors. Otherwise, short-circuit
current will flow through the PS-54, or the PS-52
or this device from the ground terminal, which
could cause an electrical accident or damage.
DANGER

Usage Notes
12
•To prevent fire or damage of the measurement
target and device as well as burns, exercise
caution concerning the following when measuring
high-frequency currents or currents that contain
high-frequency components:
•Eddy current loss may cause heating of the
sensor head.
•Dielectric heating may cause heating of cord
insulation and other materials.
•Be sure to observe all operating precautions for
the waveform measurement instrument and other
measurement instruments to which this device is
connected.
•This device 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 circuitoccurs.
•Before clamping the conductor being measured,
make sure that the insulation on the conductor is
undamaged. Also, take care not to damage the
insulation when clamping the conductor. Any
damage to the insulation could cause an electric
shock.
DANGER

Usage Notes
13
Demagnetizing
•Do not press and hold the DEMAG/AUTO ZERO
key to perform demagnetization while the
conductor being measured is clamped. Doing so
could damage the circuitry or cause an accident
that might result in injury or death.
Conductor
•Ensure that the input does not exceed the
maximum rated current to avoid device damage,
shortcircuiting and electric shock resulting from
heat building.
WARNING

Usage Notes
CAUTION
14
•To avoid damage to the output connector on
the terminator or the BNC input terminal’s
locking mechanism on the waveform measuring
instrument, do not rotate with both terminals
connected. Additionally, exercise care toensure
that connections are not subject to stress.
• Do not place foreign objects between the
mating faces of the sensor head, insert foreign
objects into the gaps of the sensor head, or
touch the mating faces. Doing so may worsen
the performances of the sensor or interfere with
clamping action.
•Do not apply a static electricity or other source of
high voltage to the sensor. Doing so maydamage
its internal Hall elements and circuitry.
•Do not short-circuit the output terminal and do not
input voltage to the output terminal. The device
may be damaged.
•Note that the device may be damaged if the
applied current exceeds the measurement range.

Usage Notes
CAUTION
15
•When the PS-54, PS-52 Power Supply or
waveform measurement instrument’s power is
turned off, do not apply current to the device.
Doing somay
damage the device, the PS-54, PS-52 Power Supply
and/or waveform measurement instrument.
•Do not place any unclamped conductor with
an electric current of a frequency of 10 kHz or
more near the sensor head. Current flowing in
the conductor nearby may heat up the sensor
head and cause its temperature to rise, leading
to damage to the device. For example, when one
side of a go-and-return conductor is clamped
and the other side is also placed near thesensor
head as shown in the diagram, even if the electric
current is lower than the maximum rated current,
electric currents in both sides will heat up the
wires and raise the temperature, thereby causing
damage to the device.
•The maximum rated current isbasedon heatthat
isinternallygeneratedduringmeasurement.Never
inputcurrentin excessofthis level. Exceeding the
rated level may result in damage to the device.

Usage Notes
CAUTION
16
•The device may sustain damage fromself-heating
even at current levels that are lower than the
maximum current value defined by the maximum
rated current.
The maximum rated current is a recommended
value that assumes sine-wave input under
standard conditions. Self-heating may increase
if the ambient temperature increases or the
measurement current waveform contains other
frequency components. Refer to the derating
characteristics in the product specifications
(p. 50).
•The product specifications that indicate the
maximum input range include a maximum peak
current value of ±7.5 A peak (non-continuous) in
addition to the maximum rated current. This value
constitutes an absolute upper limit that must
never be exceeded, even momentarily. Always
use the device within the specified range in order
to avoid damaging it.
•The detection frequency band for overload
warnings is DC and 45 to 66 Hz (sine wave).
When measuring currents that are outside the
detection frequency band, the overload warning
function may not operate. Under such conditions,
exercise caution so as not to exceed the
maximum rated current, regardless of whether the
OVERLOAD LED is flashing.