YOKOGAWA 720930, 720931 User Manual

User's
Manual

Checking the Contents of the Package

Unpack the box, and check the following before operating the instrument. If the wrong items have been
delivered, if items are missing, or if there is a problem with the appearance of the items, contact your
nearest YOKOGAWA dealer.

Instrument

Check that the product that you received is what you ordered by referring to the model name and

suffix code given on the name plate.

MODEL Specifications

720930 Clamp-on Probe 50A
720931 Clamp-on Probe 200A

Standard Accessories

Item Model/Part No. Quantity Notes

Cable marker — 8 4 types x 2
Manuals IM 720930-01EN 1 This manual.

IM 720930-92Z1 1 A manual for China.
PIM 113-01Z2 1 List of worldwide contacts.

* The “-EN” in the manual number is the language code.

Conventions Used in This Manual

The notes and cautions in this manual are categorized using the following symbols.

Improper handling or use can lead to injury to the user or damage to the instrument.

This symbol appears on the instrument to indicate that the user must refer to the
user’s manual for special instructions. The same symbol appears in the corresponding
place in the user’s manual to identify those instructions. In the manual, the symbol is
used in conjunction with the word “WARNING” or “CAUTION.”

WARNING

Calls attention to actions or conditions that could cause serious or fatal injury to the
user, and precautions that can be taken to prevent such occurrences.

CAUTION

Calls attention to actions or conditions that could cause light injury to the user or
damage to the instrument or user’s data, and precautions that can be taken to prevent
such occurrences.

French

Une manipulation ou une utilisation incorrectes risquent de blesser l’utilisateur ou

d’endommager l’instrument. Ce symbole apparaît sur l’instrument pour indiquer
à l’utilisateur qu’il doit se reporter au manuel de l’utilisateur afin d’y lire les
instructions spécifiques correspondantes. Ce même symbole apparaît à la section
correspondante du manuel de l’utilisateur pour signaler lesdites instructions. Dans le
manuel de l’utilisateur, ce symbole est accompagné des termes AVERTISSEMENT et
ATTENTION.

AVERTISSEMENT

Attire l’attention sur des gestes ou des conditions susceptibles de provoquer des
blessures graves (voire mortelles), et sur les précautions de sécurité pouvant
prévenir de tels accidents.

ATTENTION

Attire l’attention sur des gestes ou des conditions susceptibles de provoquer des blessures
légères ou d’endommager l’instrument ou les données de l’utilisateur, et sur les précautions de
sécurité susceptibles de prévenir de tels accidents.

Note

Calls attention to information that is important for the proper operation of the
instrument.

Safety Precautions

This product is designed to be used by a person with specialized knowledge. The general safety
precautions described herein must be observed during all phases of operation. If the instrument is used
in a manner not specified in this manual, the protection provided by the instrument may be impaired. This
manual is part of the product and contains important information. Store this manual in a safe place close to
the instrument so that you can refer to it immediately. Keep this manual until you dispose of the instrument.
YOKOGAWA assumes no liability for the customer’s failure to comply with these requirements.
The following symbols are used on this instrument.

Warning: handle with care. Refer to the user’s manual or service manual. This symbol

appears on dangerous locations on the instrument which require special instructions
for proper handling or use. The same symbol appears in the corresponding place in
the manual to identify those instructions.

Indicates an Instrument with double or reinforced insulation.

Indicates that this instrument can clamp on bare conductors.

Alternating current

French

Avertissement : À manipuler délicatement. Toujours se reporter aux manuels

d'utilisation et d'entretien. Ce symbole a été apposé aux endroits dangereux de
l'instrument pour lesquels des consignes spéciales d'utilisation ou de manipulation
ont été émises. Le même symbole apparaît à l'endroit correspondant du manuel pour
identifier les consignes qui s'y rapportent.

Équipement protégé par une double isolation ou une isolation renforcée.

Indique que cet instrument peut être serré sur des conducteurs nus.

Courant alternatif

This manual describes the safety precautions for using the clamp-on probe and the clamp-on probe
specifications. To ensure correct use, please read this manual thoroughly.
After reading this manual, keep it in a safe place.
Please read this manual together with the user’s manual of the measuring instrument that you are
using.

WARNING

• This instrument is designed to measure the current. Do not use this instrument
for anything other than as current measuring instrument.

• Do not use the instrument if there is a problem with its physical appearance.

• Never make measurement on a circuit in which the electrical potential exceeds
AC 150 V in the measurement category IV and AC 300 V in the measurement
category III using the 720930.

• Never make measurement on a circuit in which the electrical potential exceeds
AC 300 V in the measurement category IV and AC 600 V in the measurement
category III using the 720931.

• Do not operate the instrument in the presence of flammable gases or vapors.
Doing so is extremely dangerous.

• Do not make measurement when thunder is rumbling. If the instrument is in use, stop
the measurement immediately and remove the instrument from the measured object.

• Do not use the instrument if the instrument or your hands are wet. Otherwise,
electrical shock accident may occur.

• The transformer jaws are made of metal and their tips are not completely
insulated. Be especially careful about the possible shorting where the
measured object has exposed metal parts.

• Always keep your fingers and hands behind the barrier on the instrument to
avoid the possible shock hazard.

• Use insulated protective gears, such as insulated gloves, for your safety when
using this instrument.

• Only qualified YOKOGAWA personnel may remove the covers and disassemble
or alter the instrument. The inside of the instrument is dangerous because parts
of it have high voltages.

• Do not install or use the instrument outdoors or in locations subject to rain or water.

CAUTION

• Do not step on or pinch the cord to prevent the jacket of cord from being
damaged.

• The output connector shall be removed or connected without clamping a
conductor. Otherwise, it may cause a failure.

• Do not expose the instrument to direct sunlight, high temperatures, humidity or
dew.

• Never give shocks, such as vibration or drop, which may damage the
instrument.

• Use a damp cloth and detergent for cleaning the instrument. Do not use
abrasives or solvents.

French

AVERTISSEMENT

• L'instrument est conçu pour mesurer l'intensité. Ne pas utiliser cet instrument à
d'autres fins que celles de mesure de l'intensité.

• Ne pas utiliser l'instrument si son intégrité physique semble être compromise.

• Ne jamais effectuer de mesure de l'intensité sur un circuit dans lequel le
potentiel électrique dépasse 150 V CA dans la catégorie de mesure IV et 300 V
CA dans la catégorie de mesure III utilisant 720930.

• Ne jamais effectuer de mesure de l'intensité sur un circuit dans lequel le
potentiel électrique dépasse 300 V CA dans la catégorie de mesure IV et 600 V
CA dans la catégorie de mesure III utilisant 720931.

• Ne pas utiliser l'instrument en présence de gaz ou de vapeurs inflammables.
Cela pourrait être extrêmement dangereux.

• Ne pas effectuer de mesure lorsque le tonnerre gronde. Si l'instrument est en
cours d'utilisation, arrêter immédiatement la mesure et retirer l'instrument de
l'objet mesuré.

• Ne pas utiliser l'instrument s'il est mouillé ou si vos mains sont mouillées.
Sinon, un choc électrique peut se produire.

• Les mâchoires du transformateur sont composées de métal et leurs embouts
ne sont pas totalement isolés. Il faut être particulièrement attentif à l'éventuelle
réduction à laquelle l'objet mesuré a exposé les pièces métalliques.

• Les mains et les doigts doivent toujours rester derrière la barrière de
l'instrument afin d'éviter un éventuel choc.

• Utiliser des équipements de protection isolés, tels que des gants isolés, pour
votre sécurité lors de l'utilisation de cet instrument.

• Seul le personnel YOKOGAWA qualifié est habilité à retirer le capot et à
démonter ou modifier l'instrument. Certains composants à l'intérieur de
l'instrument sont à haute tension et par conséquent, représentent un danger.

• Ne pas installer, ni utiliser l'instrument à l'extérieur ou dans des lieux exposés à
la pluie ou à l'eau.

ATTENTION

• Ne pas marcher sur le cordon et ne pas le pincer afin d'éviter que la gaine du
cordon ne soit endommagée.

• Le connecteur de sortie doit être retiré ou raccordé sans serrer un conducteur.
Si cette condition n'est pas respectée, cela risque de générer une défaillance.

• Ne pas exposer l'instrument aux rayons directs du soleil, à des températures
élevées, à l'humidité ou à la rosée.

• Ne jamais faire de chocs, tels que des vibrations ou des chutes, qui risqueraient
d'endommager l'instrument.

• Utiliser un chiffon humide et du détergent pour nettoyant l'instrument. Ne pas
utiliser de produits abrasifs ou de solvants.

720930, 720931
Clamp-on Probe

IM 720930-01EN
1st Edition

1st Edition: July 2017 (YMI)
All Rights Reserved, Copyright © 2017, Yokogawa Meters & Instruments Corporation
Printed in Japan

IM 720930-01EN 1/2

nbn Elektronik Handelsgesellschaft m. b. H.

Riesstraße 146, 8010 Graz

www.nbn.at Tel. [phone] | Fax [phone]

Vertrieb für Österreich :

Waste Electrical and Electronic Equipment

Waste Electrical and Electronic Equipment
(This directive is valid only in the EU.)
This product complies with the WEEE directive marking requirement. This marking

indicates that you must not discard this electrical/electronic product in domestic
household waste.

Product Category
With reference to the equipment types in the WEEE directive, this product is classified

as a “Monitoring and control instruments” product.

Do not dispose in domestic household waste. When disposing products in the EU,

contact your local Yokogawa Europe B. V. office.

Authorized Representative in the EEA

Yokogawa Europe B.V. is the authorized representative of Yokogawa Meters & Instruments Corporation
for this product in the EEA. To contact Yokogawa Europe B. V., see the separate list of worldwide
contacts, PIM 113-01Z2.

Measurement Category

To ensure safe operation of measuring instruments, IEC 61010 establishes safety standards for various
electrical environments, categorized as O to IV, and called measurement categories.
Measurement category O (Other)
Applies to measurement of circuits that are not directly connected to a main power source. This

category applies to measurement of secondary electric circuits in equipment across a transformer.
Measurement category II
Applies to measurement of circuits, such as household electric appliances and portable electric

tools, that are connected to low-voltage installations.
Measurement category III
Applies to measurement of facility circuits, such as distribution boards and circuit breakers.
Measurement category IV
Applies to measurement of power source circuits, such as entrance cables to buildings and cable

systems, for low-voltage installations.

Component Names

Transformer jaw Barrier

Trigger Cable Output connector

Specifications

Measurable conductor size 720930: Max. φ18 mm, 720931: Max. φ30 mm
Measuring range 720930: AC 0 to 50 Arms,

720931: AC 0 to 200 Arms (300 Apeak)

Output voltage 720930: AC 0 to 500 mVrms (10 mV/A)

720931: AC 0 to 500 mVrms (2.5 mV/A)

Accuracy
(sine wave input)

Bandwidth 720930

±0.5%rdg±0.1 mV (50/60Hz)
±0.8%rdg±0.2 mV (40 Hz to 1 kHz)
±1.0%rdg±0.4 mV (1 kHz to 3.5 kHz)
720931
±0.5%rdg±0.1 mV (50/60 Hz)
±0.8%rdg±0.2 mV (40 Hz to 1 kHz)
±1.0%rdg±0.4 mV (1 kHz to 3.5 kHz)

Phase 720930: Within ±2.0 deg (0.5 to 50 A, 40 Hz to 3.5 kHz)

720931: Within ±1.0° deg (2 to 200 A, 40 Hz to 3.5 kHz)

Accuracy-guaranteed temperature
and humidity

23±5°C, Humidity: 85%RH or less (no condensation)

Rated voltage between circuit and
ground

720930: AC 300 Vrms max.
720931: AC 600 Vrms max.

Operating temperature & humidity
range

0 to 50°C, 85%RH or less (no condensation)

Storage temperature & humidity
range

-20 to 60°C, 90%RH or less (no condensation)

Temperature coefficient 0.05% f.s./°C (0 to 50°C)
Maximum allowable input 720930: AC 130 Arms continuous (50/60 Hz)

720931: AC 250 Arms continuous (50/60 Hz)

Influence of the conductor location 720930: Within ±0.5% rdg (1 to 50 A, 45 Hz to 1 kHz)

720931: Within ±0.5% rdg (20 to 200 A, 45 Hz to 1 kHz)

Influence of the external magnetic
field

720930: Equivalent to 0.1 A or less (400 A/m, 50/60 Hz)

720931: Equivalent to 0.1 A or less (400 A/m, 50/60 Hz)
Output impedance 720930: Approx. 18 Ω, 720931: Approx. 6 Ω
Withstand voltage 720930

AC 3.7 kVrms / 1 minute
Between jaw and case, case and output terminal, output terminal and jaw.

720931

AC 5.4 kVrms / 1 minute

Between jaw and case, case and output terminal, output terminal and jaw.
Environmental conditions Altitude up to 2000 m, in-door use
Recommended calibration period 1 year
External dimensions 720930: 52 (W) × 106 (H) × 25 (D) mm (excluding protrusions)

720931: 73 (W) × 130 (H) × 30 (D) mm (excluding protrusions)
Cable length Approx. 2.8 m
Output terminal BNC connector (isolated)
Weight 720930: Approx. 210 g, 720931: Approx. 280 g
Standard accessories Instruction manual, cable marker
Safety standards Compliant standards: EN 61010-1, EN 61010-2-032

Measurement category

720930: Measurement category III (rated voltage between

circuit and ground: 300 Vrms)
Measurement category IV (rated voltage between
circuit and ground: 150 Vrms)

720931: Measurement category III (rated voltage between

circuit and ground: 600 Vrms)
Measurement category IV (rated voltage between
circuit and ground: 300 Vrms)

Pollution degree 2

*

EMC standards Compliant standard: EN 61326-1

Influence in the immunity testing environment (criteria A)
720930: Equivalent to 10 A or less
720931: Equivalent to 40 A or less

Environmental standards Compliant standard: EN 50581 Monitoring and control instruments

including industrial monitoring and control instruments

* Pollution Degree applies to the degree of adhesion of a solid, liquid, or gas that deteriorates

withstand voltage or surface resistivity. Pollution degree 2 applies to normal indoor atmospheres
(with only non-conductive pollution).

External Dimensions

52

Ø30

720930

720931

106

25

Ø

18

130

73

Unless otherwise specified, tolerances are ±3% (however, tolerances are ±0.3 mm when below 10 mm).

Unit: mm

30

2880

±60

2880

±60

Measurement

WARNING

The transformer jaws are made of metal and their tips are not completely
insulated. Be especially careful about the possible shorting where the measured
object has exposed metal parts.

CAUTION

• Take sufficient care to avoid shock, vibration, or excessive force when handling
the instrument. Otherwise, the precisely adjusted transformer jaws will be
damaged.

• When transformer jaws do not fully close, never try to close them by force, but
make them free to move and try again. If a foreign substance is stuck in the jaw
tips, remove it.

• When making current measurements, keep the transformer jaws fully closed.
Otherwise, accurate measurements cannot be taken.
Maximum conductor size is as follows.

720930: 18 mm in diameter
720931: 30 mm in diameter

• Hold the inserting part (not the cable), and disconnect the output connector
from the measuring instrument so as not to break the cord.

French

AVERTISSEMENT

Les mâchoires du transformateur sont composées de métal et leurs embouts ne
sont pas totalement isolés. Il faut être particulièrement attentif à un éventuel court­circuit là où l'objet mesuré possède des parties métalliques exposées.

ATTENTION

• Procéder avec suffisamment de soin pour éviter les chocs, les vibrations ou
une force excessive lors de la manipulation de l'instrument. Si cette condition
n'est pas respectée, les mâchoires du transformateur ajustées avec précision
seront endommagées.

• Si les mâchoires du transformateur ne ferment pas totalement, ne jamais
essayer de les fermer en forçant, mais les laisser libres et réessayer. Si une
substance étrangère est bloquée dans les extrémités de la mâchoire, la retirer.

• Lors de la prise de mesures d'intensité, maintenir les mâchoires du
transformateur entièrement fermées. Si cette condition n'est pas respectée, il
est impossible d'effectuer des mesures précises.

La taille maximale du conducteur est la suivante.

Modèle 720930: 18 mm de diamètre
Modèle 720931: 30 mm de diamètre.

• Maintenir la partie d'insertion (excepté pour le câble) et débrancher le
connecteur de sortie de l'instrument de mesure afin de ne pas entraîner une
rupture au niveau du cordon.

Measurement procedures

1.

Connect the output connector to the Input terminal of the measuring instrument.

2.

Press the trigger to open the transformer jaws and clamp onto one conductor. The measured
conductor shall be at the center of the jaws.

When connecting a sensor with a power meter, match the arrow mark (power source to

load), which is indicated on the transformer jaws, with the current flowing direction in order to
synchronize the phases of measured current and output voltage.

3.

Ensure that the tips of transformer jaws are firmly closed.

Current direction arrow

Conductor

Power source

Load

Disposing of the Instrument

When disposing of this instrument, follow the laws and ordinances of the country or region where the
product will be disposed of.

IM 720930-01EN 2/2

nbn Elektronik Handelsgesellschaft m. b. H.

Riesstraße 146, 8010 Graz

www.nbn.at Tel. [phone] | Fax [phone]

Vertrieb für Österreich :