User’s
Manual
保証書付
CW10
クランプ電力チェッカ
Clamp-on Power Meter
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
この取扱説明書は、いつでも使用できるよう
大切に保管してください。
Store this manual in an easily accessible place
for quick reference.
IM CW10-JA: Japanese
IM CW10-EN: English
7th Edition: Nov. 2017 (YMI)
Regarding the Safe Use of This Product
WARNING
CAUTION
This product is designed to be used by a person with specialized
knowledge. When operating the instrument, be sure to observe
the cautionary notes given below to ensure correct and safe use of
the instrument.
instructed in this manual, the instrument’s protective measures
may be impaired. This manual is an essential part of the product;
keep it a safe place for future reference.
YOKOGAWA is by no means liable for any damage resulting from
use of the instrument in contradiction to these cautionary notes.
The following safety symbols are used on the instrument and in
this manual.
If you use the instrument in any way other than as
Danger! Handle with Care.
This symbol indicates that the operator must refer to
an explanation in the User’s Manual in order to avoid
risk of injury or death of personnel or damage to
the instrument.
Indicates a hazard that may result in the loss of life
or serious injury of the user unless the described
instruction is abided by.
Indicates a hazard that may result in an injury to
the user and/or physical damage to the product or
other equipment unless the described instruction is
abided by.
Hazardous Voltage
This operator must never attempt to touch equipment or
parts marked with this symbol.
This symbol indicates double insulation or reinforced
insulation.
This symbol indicates direct current (DC).
This symbol indicates alternating current (AC).
This symbol indicates ground (earth).
This symbol indicates a battery.
This symbol indicates that this instrument designed to
be applied around or removed from HAZARDOUS LIVE
conductors provided if the RATED circuit-to-earth voltage
dose not exceed the value indicated in the measurement
category.
This symbol indicates, If the measured voltage is
greater than 30 V DC or AC RMS or Overload
(OL or –OL).
1
Always observe the following instructions. Failure to do so may
WARNING
CAUTION
result in electrical shock or other dangers that may lead to serious
injury or the loss of life.
• The instrument is a power measurement instrument that can measure
parameters such as voltage, current, and power.
Do not use this instrument for any other purpose.
• Do not use the instrument if there is a problem with its physical
appearance.
• Do not use the instrument in an atmosphere where any flammable or
explosive gas is present.
• To avoid a short-circuit or an accident to personnel, use this instrument
within the RATED circuit-to-earth voltage, maximum input voltage and
current.
• Avoid using the instrument if it has been exposed to rain or moisture or
if your hands are wet.
• Barrier is for to avoid touching the HAZARDOUS LIVE conductor.
Be careful not to across the Barrier when using the instrument.
• Do not use the instrument if there is any damage to the casing or
when the casing is removed.
• Use the test leads supplied by Yokogawa with this instrument.
• Do not use test leads that have deteriorated or are defective.
• Check the test leads continuity.
• When you attach or remove the test leads or remove the case
(for example to charge the battery), be sure to remove the test leads
from the circuit under measurement.
• When you remove the case (for example to change the battery),
be sure to remove the test leads from the instrument.
• Safety protectors such as rubber-insulated gloves should be worn to
prevent electrical shock when using the instrument.
• There are caps at the ends of the test leads. To ensure safety
(safety standard EN 61010-031), be sure to put the caps on the leads
when you use them.
• Do not open the case except when replacing batteries.
Only Yokogawa service personnel are authorized to remove the casing
or disassemble or modify the instrument.
Do not attempt to repair the instrument yourself, as doing so is
extremely dangerous.
• The product is for domestic use (Class B) and meets
the electromagnetic compatibility requirements.
• Do not use the instrument near noise-emitting equipment or where
there may be sudden changes in temperature.
Otherwise, the instrument may produce an unstable readings or errors.
• Do not wipe the instrument using an organic solvent.
When cleaning the instrument, use a dry cloth.
• Do not leave the tester exposed to direct sunlight or in a hot and humid
location such as the inside of a car, for any prolonged length of time.
• If the instrument will not be used for long periods, remove the battery.
2
Contents
Regarding the Safe Use of This Product....................... 1
1. Checking the Contents of the Package .................... 4
2. Measurement Category ................................ 4
3. Components ......................................... 5
4. Display (LCD) ........................................6
5. Power ON/OFF and Auto power off .......................6
6. Cursor/ENTER key .................................... 6
7. Making Basic Measurements ............................ 7
7.1 Measuring Voltage ............................... 7
7.2 Measuring Current ............................... 7
8. Others Function ...................................... 8
8.1 AUTO SENSE ...................................8
8.2 RANGE ........................................ 8
8.3 Peak Hold (AC mode only) ......................... 9
8.4 Inrush current (AC mode only) ..................... 11
8.5 DCA ZERO .................................... 12
8.6 Measuring Frequency Hz (AC mode only) ............ 12
8.7 MAX/MIN...................................... 13
8.8 Harmonic Measurement (AC mode only) .............13
8.8.1 THD Measurement ........................ 13
8.8.2 Individual Harmonic Measurement ............ 14
8.9 Low pass filter (AC mode only) .....................14
8.10 Measuring Active Power .......................... 15
8.10.1 Single phase 2 wire ........................15
8.10.2 3 phase 3 wire (balanced/unbalanced) . . . . . . . . . 16
8.10.3 3 phase 4 wire (balanced/unbalanced) . . . . . . . . . 16
8.10.4 Phase Rotation ........................... 17
8.11 Measuring Resistance............................19
8.11.1 Resistance (Ω)............................ 19
8.11.2 Continuity Check ..........................20
8.11.3 Diode Test ...............................20
8.12 HOLD ........................................ 20
8.13 Voltage Sense ..................................20
8.14 Buzzer........................................ 21
8.15 Additional Power-on Function......................21
9. Battery State display and Battery Replacement ............. 21
9.1 Battery State display .............................21
9.2 Battery Replacement............................. 21
10. Specifications ....................................... 22
10.1 General Specifications ...........................22
10.2 Accuracy ...................................... 23
11. Maintenance and After-Sales Service ....................26
12. Sales in Each Country or Region ........................26
12.1 Disposing the Product............................ 26
12.2 How to Replace and Dispose the Batteries............26
12.3 Authorized Representative in the EEA ............... 26
12.4 For the Pollution Control of Electronic and
Electrical Products of the People's Republic of China ... 27
Disk No. CW10
7th Edition: November 2017
All Rights Reserved, Copyright ©
2011, Yokogawa Test & Measurement Corporation
Printed in Taiwan
3
1. Checking the Contents of the Package
WARNING
After opening the package, be sure to check the product as
instructed below before use.
1. Main Unit: CW10 (including battery)
2. Test leads: 1set (Black and Red)
3. User’s Manual
4. Soft Case
2. Measurement Category
When you use the test leads, attach or remove the caps
according to the measurement category.
CW10 main unit:
1000V CAT III, 600V CAT IV
Test leads:
With Caps: 1000V 10A CAT III, 600V 10A CAT IV
Without Caps: 1000V 10A CAT II
Measurement
Category
O
None
Other
CAT II
CAT III
CAT IV
Description Remarks
Other circuits that are not
directly connect to MAINS.
For measurement performed
on circuits directly connected
to the low-voltage installation.
For measurement performed
in the building installation.
For measurement performed
at the source of the low-voltage
installation.
4
Circuits not
connected to a
mains power source.
Appliances,
portable equipment,
etc.
Distribution board,
circuit breaker, etc.
Overhead wire,
cable systems, etc.
3. Components
10.Terminals of test leads
4.Barrier
CW10
Test leads
7.Open/
close lever
1.Jaw section
2.Light
3.Voltage sense
LED
5.Hold and Zero key
6.Function switch
8.LCD display
9.Cursor/
Enter key
Caps of Test leads
Main Unit: CW10
[NOTE]
Black
Red
1. Is a precision sensor for detecting currents.
2. When the jaws are open, the light will illuminate.
3. In case voltage is detected by the jaw, the red LED lights up.
4. Prevents contact with the wires.
5. Retains the measured data or DCA ZERO: Zero adjustment
6. Use this switch to turn the power on and off and to select
the measurement mode.
7. Opens and closes the jaws.
8. LCD display
9. Cursor and Enter key
10. Input terminals for test leads
There is the mark on the terminal, but this device does not
have a function for measuring capacitance.
5
4. Display (LCD)
CAUTION
LEFT
5. Power ON/OFF and Auto power off
Check that the meter operates normally.
Turn the function switch to the measurement (any) position from OFF.
To end measurement, turn the function switch off.
<Auto power off>
Indication:
This instrument automatically turns off about 15 minutes after
the last switch operation.
APO
Recovering the Auto power off function:
Turn off the power. Turn on the power.
When the function is not use (cancellation):
Turn off the power. Hold down Downward of cursor key,
turn the function switch to any position.
(The APO display goes off.)
If the instrument is used with the Auto power off function
cancelled, take care not to let the battery run down.
6. Cursor/ENTER key
UP
RIGHT
ENTER
DOWN
Cursor key: Moves the Cursor (four directions) to the item (mode)
ENTER key: Confirms the item (mode).
of display you wish select. Press the convex key
toward selecting mode.
UP
[NOTE]
Push whole key toward requisite item.
Push down the center position of key to confirm (ENTER key).
6
7. Making Basic Measurements
WARNING
DC
AC
Test leads
WARNING
7.1 Measuring Voltage
Do not apply more than 1000 VDC or 1000 Vrms (1414.2 Vpk).
Plug the test leads to the input terminals.
[NOTE]
When connecting the test leads to the circuit under measurement,
connect the black (common) before connecting the red (live);
when removing the test leads, remove the red (live) before
removing the black (common).
Turn the function switch to the Voltage position.
Read the voltage value of display.
On Auto Sense mode, the CW10 automatically detects AC or DC.
Black
Red
7.2 Measuring Current
• Do not apply more than 600 ADC or 600 Arms (848.5 Apk).
• When you measure the current, be sure to remove the test leads
from the instrument.
Squeeze the open/close lever to open the jaws. Insert a wire from the
measurable conductors under the test though the jaws, making sure
the tops of the jaws are tightly shut.
Turn the function switch to the Current
Read the current value of display.
Using Auto Sense mode, the CW10 automatically detects AC or DC.
[NOTE]
• When performing a measurement, hold the instrument so that
the measured conductor cable runs at the center of the clamp.
• Ensure that the orientation of the clamp to the direction of
the conductor wire is correct as shown right.
position.
7
AC
DC
8. Others Function
8.1 AUTO SENSE
Using Auto Sense mode, the CW10 automatically detects AC or DC.
(The detection is determined by whichever input is greater.)
To select manual mode (Example: DC mode);
Use the cursor key to select under “DC” (flash) and then press
the ENTER key to confirm.
Upper “DC” indication is fixed and AUTO (AUTO RANGE) is displayed.
To return AUTO SENSE, press the ENTER key
for more than 2 seconds.
8.2 RANGE
To select manual range (fixed);
Use the cursor key to select “RANGE” and then press the ENTER key
to confirm.
(To cancel manual range, press the ENTER key
for more than 2 seconds.)
Example: ACV 100 V range
1000 V range
← →
ENTER
On Auto sense mode, the measuring range is automatic.
8
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