Hioki 3270 User manual

INSTRUCTION MANUAL
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3270
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CURRENT MONITOR

Contents
Introduction 1
Notes on Safety 1
Inspection 3
Precautions 3
Chapter 1 3270 Current Monitor 5
1.1 Product Overview 5
1.2 Identification of Indicators 6
1.3 Product Specifications 6
1.4 Measurement Procedure 9
1.4.1 Preparation 9
1.4.2 Measurement 10
1.4.2.1 When Using the 9273 11
1.4.2.2 When Using the 9274 13
1.4.2.3 When Using the 9275 16
1.4.2.4 When Using the 9276 18
1.4.3 Explanation of Each Function 20
1.4.3.1 Connector 20
1.4.3.2 Output Terminals 20
1.4.3.3 Measurement ranges 21
1.4.3.4 Demagnetizing (DEMAG) 23
1.4.3.5 Zero adjustment (ZERO ADJ.) 23
1.4.3.6 Coupling (COUPLING) 24
1.4.3.7 Filter (FILTER) 24
1.4.3.8 Overload indicator (OVERLOAD) 25
1.5 Fuse Replacement 25
Chapter 2 9273 Clamp-On AC Sensor 27
2.1 Product Specifications 27
Chapter 3 9274 Clamp-On AC/DC Sensor 31
3.1 Product Specifications 31

Chapter 4 9275 Clamp-On AC Sensor 35
4.1 Product Specifications 35
Chapter 5 9276 Clamp-On AC/DC Sensor 39
5.1 Product Specifications 39

1
WARNIN
G
This instrument is designed to prevent accidental
shock to the operator when properly used. However
no engineering design can render safe an instrument
which is used carelessly. Therefore, this manual
must be read carefully and completely before making
any measurement. Failure to follow directions can
result in a serious of fatal accident.
I
ntroduction
N
otes on Safety
Thank you for purchasing this Hioki 3270 Current
Monitor. In order to use this product effectively and to
ensure that it enjoys a long operational life, read this
Instruction Manual carefully and then retain it for future
reference.

2
This symbol is affixed to locations on the equipment
where the operator should consult corresponding
topics in this manual (which are also marked with the
symbol) before using relevant functions of the
equipment.
In the manual, this mark indicates explanations
which it is particularly important that the user read
before using the equipment.
This symbol denotes a ground terminal.
This symbol denotes a fuse.
DANGE
R
Indicates that incorrect operation presents extreme
danger of accident resulting in death or serious
injury to the user.
WARNIN
G
Indicates that incorrect operation presents
significant danger of accident resulting in death or
serious injury to the user.
CAUTIO
N
Indicates that incorrect operation presents
possibility of injury to the user or damage to the
equipment.
NOTE Denotes items of advice related to performance of
the equipment or to its correct operation.
Safety Symbols
This Instruction Manual provides information and
warnings essential for operating this equipment in a safe
manner and for maintaining it in safe operating
condition. Before using this equipment, be sure to
carefully read the following safety notes.
The following symbols are used in this Instruction
Manual to indicate the relative importance of cautions
and warnings.

3
CAUTIO
N
• Do not subject the unit to vibrations or shocks during
transport or handling. Be especially careful to avoid
dropping the unit.
• Do not store the unit where it will be exposed to direct
sunlight, high temperature, high humidity, or
condensation. If exposed to such conditions, the unit
may be damaged, the insulation may deteriorate, and
the unit may no longer satisfy its specifications.
• Before using the unit, inspect it and check the operation
to make sure that the unit was not damaged due to
poor storage or transport conditions. If damage is
found, contact your dealer or Hioki representative.
I
nspection
P
recautions
When the unit is delivered, check and make sure that it
has not been damaged in transit. In particular, check the
accessories, panel switches, and connectors.
If the unit is damaged, or fails to operate according to the
specifications, contact your dealer or Hioki representative.
In order to ensure safe operation and to obtain maximum
performance from the unit, observe the cautions listed
below.

4
WARNIN
G
This unit is designed to be grounded through the
three-wire power cord provided. In order to prevent
electric shock, etc., connect this power cord to a
grounded three-prong power receptacle.
Before using a three-prong adapter, be sure to
connect the green wire from the adapter to ground.
CAUTIO
N
• When unplugging the power cord from the power
receptacle or from the unit, grasp the plug, not the cord
,
in order to avoid damaging the cable.
• Several volts are generated at the output terminal when
the power is turned on or turned off.
CAUTIO
N
• If there is any type of dust or dirt on the core contact
surfaces, measurements may be affected. Wipe it
away gently with a soft cloth.
• Do not apply any sort of mechanical impact to the core
section. Scratches on the core surfaces will make
accurate measurements impossible.
• Do not bend or pull the sensor cables (especially where
the cable connects to the sensor) in order to avoid
damaging the sensor cables.
• When the power for the 3270 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.)
• Taking the sensor apart may damage the open-close
mechanism that could result in an inoperative unit.
Current Monitor (3270)
Clamp-On Sensor

5
Chapter 1 3270 Current Monitor
Chapter
1
3270 Current Monito
r
1
.1 Product Overview
This monitor is a seven-range amp designed especially for
the 9273, 9274, 9275, and 9276 clamp-on sensors. When
used in conjunction with any of the four sensors and
connected to a recorder, oscilloscope, etc., this unit can be
used to easily record and monitor current waveforms.

6
Chapter 1 3270 Current Monitor
C
ouplin
g
s
witch
Connecto
r
Ground terminal
Power supply connecto
r
Output terminals
(Johnson terminals
)
FrontRea
r
Filter
switc
h
Overload
indicators
Demagnetizing
switch
Zero
adjustment
dial
Ranges Range switc
h
Output termina
l
(BNC terminal)
Fuse holde
r
Power ON
Power switc
h
Power OFF
1
.2 Identification of Indicators
1
.3 Product Specifications
(Accuracy is guaranteed at 23°C±3°° °C after the power has
been on for 30 minutes)
♦Compatible sensors 9273, 9274, 9275, 9276
♦Output voltage 1V/range (front: Johnson
terminals; rear: BNC terminal)
♦Measurement ranges 0.1/0.2/0.5/1/2/5/10 A
(when using the 9273 or 9274)
1/2/5/10/20/50/100 A
(when using the 9275 or 9276)