Yokogawa CW10 Specifications

LF CW10-EN

Features

■ AC / DC Power up to 600 kW

■ True RMS for AC .

■ Harmonics 1st to 25th order

■ Power fluctuation using the ACA Inrush and

Peak hold functions.

■ AC / DC Voltage max. 1000 V

■ AC / DC Current max. 600 A

■ Frequency, Resistance, Continuity, Diode check,

Power factor.

■ Up to 9999 counts, approx. 37mm max.
diameter of measurable conductor (the jaw
opens approx. 45mm max.)

For Safety

■ CATIV 600V and CATIII 1000V compliant.

Useful Functions

■ Backlight on the display area turns on and a
white LED automatically illuminates the front of
jaw when clamping.

■ Non-contact Voltage Detection (Red LED lights
up on detection).

■ Easy Operation with the Navigator key.

■ Low Pass Filter, Phase Detection, AC / DC

Auto Sense.

Power measurement example

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<URL : tmi.yokogawa.com>

SOURCE

Clamp-on Power Meter

A Simple Yet A Powerful Power
Measuring Tool.

Subject to change without notice.

[Ed : 02/b] Copyright ©2011

Printed in Japan, 109(KP)

YOKOGAWA METERS & INSTRUMENTS CORPORATION

Global Sales Dept.

/Phone: [phone] Facsimile: [phone]

E-mail: [e-mail]

YOKOGAWA CORPORATION OF AMERICA Phone: [phone], Fax: [phone]
YOKOGAWA EUROPE B.V. Phone: [phone], Fax: [phone]
YOKOGAWA ENGINEERING ASIA PTE. LTD. Phone: [phone], Fax: [phone]

■ Inrush Current Measurement Method

Figure 1 Small motor Figure 2

Inrush AC current
Displays RMS value of 100ms period.

Explanation

A function to measure inrush current is available.
This function allows you to easily measure inrush current
that occurs when starting a motor, relay, or the like.
Just clamp the CW10 to the motor and set INRUSH
before starting the motor to automatically measure
and hold the inrush current that occured in 100 ms
period (Figure 2).

What is inrush current?

Starting current or inrush current is the
instantaneous electrical current that flows when
the power is initially turned on.

Application

Specifications

Inrush current

Accuracy

23± 5°C, 80%RH or less
Accuracy: ±(% of reading + digits)

Voltage

Rms-value detection

Function Range

Resolution

(Maximum reading)

Accuracy*

DCV

100 V 99.99 V

0.7% + 2

1000 V 999.9 V

ACV

100 V 99.99 V

1.0% + 5

50 ~ 500Hz

1000 V 999.9 V

LPF
ACV

100 V 99.99 V

50 ≤ f ≤ 60Hz: 1.0% + 5

60 < f ≤ 400Hz: 5.0% + 5

1000 V 999.9 V

* DCV<1000digits: add 6digits to accuracy

ACV<1000digits: add 3digits to accuracy
Maximum input voltage: 1000 Vrms, 1414.2 Vpk
Input impedance: approx. 3.5MΩ, <100pF
AC+DC Vrms accuracy=ACV accuracy + DCV accuracy

Crest factor effects

1.4 < CF ≤ 2.0: add 1.0% of reading to accuracy

2.0 < CF ≤ 2.5: add 2.5% of reading to accuracy

2.5 < CF ≤ 3.0: add 4.0% of reading to accuracy

Maximum input voltage: 690 Vrms CF=2 460 Vrms CF=3

Current

Rms-value detection

Function Range

Resolution

(Maximum reading)

Accuracy*

DCA

100 A 99.99 A 1.5% + 20

600 A 600.0 A*** 1.5% + 5*

ACA

100 A** 99.99 A

50 ≤ f ≤ 60Hz : 1.5% + 5*

60 < f ≤ 400Hz : 2.0% + 5*

600 A 600.0 A***

LPF
ACA

100 A** 99.99 A

50 ≤ f ≤ 60Hz : 1.5% + 5

60 < f ≤ 400Hz: 5.0% + 5

600 A 600.0 A***

*The measured value <1000digits: add 5digits to accuracy
**Input current ≥ 0.10A at 100 A range of ACA and LPF ACA
***600 A : Guaranteed accuracy (not maximum reading)
Maximum input current: 600 Arms, 848.5Apk
Conductor position effects: ±1.0% of reading
AC+DC Arms accuracy=ACA accuracy + DCA accuracy

Crest factor effects

1.4 < CF ≤ 2.0: add 1.0% of reading to accuracy

2.0 < CF ≤ 2.5: add 2.5% of reading to accuracy

2.5 < CF ≤ 3.0: add 4.0% of reading to accuracy

Maximum input current: 420 Arms CF=2 280 Arms CF=3

Peak Hold (AC mode only)

Function Range

Resolution

(Maximum reading)

Accuracy

ACV

100 V 140.0 V

3.0% + 15

1000 V 1400 V

ACA

100 A 140.0 A

3.0% + 15

600 A 850 A

PEAK MAX: polarity+, polarity­Maximum input voltage and current: 1000 Vrms, 600 Arms
Sine wave, ACV ≥ 5 Vrms, ACA ≥ 5 Arms, 50 to 400 Hz continuous wave

Frequency (Hz)

Function Resolution (Measuring range) Accuracy

100 Hz 20.00 to 99.99 Hz

0.5% + 31000 Hz 20.0 to 999.9 Hz

10 kHz 0.020 to 9.999 kHz

Maximum input voltage and current: 1000 Vrms, 600 Arms
Input condition; 100 V range: 10 to 100 Vrms
(Sine wave) 1000 V range: 100 to 1000 Vrms
100 A range: 10 to 100 Arms (<400Hz)
600 A range: 100 to 600 Arms (<400Hz)
The measured value < approx. 10 Hz: 0.00Hz

Harmonic Measurement

Individual Harmonic

Harmonic order Resolution (Maximum reading) Accuracy

1st to 12th (h01- h12)

99.9 %

5% + 10

13th to 25th (h01- h12) 10% + 10

Maximum input voltage and current: approx. 1000 Vrms, 600 Arms
The “rdy” is displayed at ACV < 10 Vrms, ACA < 10 Arms
The “OutF” is displayed at f < 45, 65 < f (f: fundamental frequency)

Inrush Current

Function Range

Resolution

(Maximum reading)

Accuracy

ACA

100 A 99.99 A 2.5% + 20

600 A 600.0 A* 2.5% + 5

Maximum input current: approx. 600 Arms
*600 A : Guaranteed accuracy (not maximum reading)
100A range: ACA1 ≥ 10 Arms (Sine wave, 50Hz/60Hz)

600A range: ACA ≥ 100 Arms (Sine wave, 50Hz/60Hz)
Measurement time: approx. 100ms

Active Power

Function Range

Resolution

(Maximum reading)

Accuracy

ACW
DCW

10 kW 9.999 kW*

ACW: 2.5% + 11**
DCW: 2.2% + 22**

100 kW 99.99 kW

600 kW 600.0 kW**

* The measured value < 1.000kW: add 10digits to the accuracy.
**Conditions of accuracy (combination of Voltage and Current

range)
10 kW range: 100 V and 100 A
100 kW range: 100 V and 600 A or 1000 V and 100 A
600 kW range: 1000V and 600 A
Other combinations:

Accuracy: (Current accuracy×Voltage reading) + (Voltage

accuracy×Current reading)

**600 kW : Guaranteed accuracy (not maximum reading)
Maximum input voltage and current: 1000 Vrms, 600 Arms
ACW: ACV ≥ 10 Vrms and ACA ≥ 5 Arms (Sine wave, 50 ≤ f

≤

60Hz, PF=1.00)

DCW: at DCV ≥ 10 V and DCA ≥ 5 A

Power Factor

Function Resolution (Measuring range) Accuracy

Power factor -1.00~0.00~1.00 ±(3°+2digits)

Maximum input voltage and current: 1000 Vrms, 600 Arms
PF: ACV ≥ 10 Vrms and ACA ≥ 5 Arms (Sine wave, 50 ≤ f ≤ 60Hz)

Resistance/Continuity check

Function Range

Resolution

(Maximum reading)

Accuracy

Resistance

Ω

1000

Ω

999.9

Ω

1.0% + 5

10 k

Ω

9.999 k

Ω

1.0% + 3

100 k

Ω

99.99 k

Ω

Continuity check

1000

Ω

999.9

Ω

1.0% + 5

The buzzer turns on for resistances lower than approx. 30Ω. (Response time:
approx. 100msec)

Maximum input voltage: 1000 Vrms
Maximum test current: approx. 0.5mA
Open circuit voltage: approx. 3V

Diode Test

Function Resolution (Measuring range) Accuracy

Diode Test 0.40~0.80 V ±0.1 V

Maximum test current: approx. 0.5mA
Open circuit voltage: approx. 1.8V

General Specifi cations

Display count

:

9999 / 6000

Measuring rate

:

3 times / sec.
Over range indicator: “OL” or “-OL”
Auto Power Off

:

Approx. 15 minute.
Low-battery indicator

:

(four steps)

Power supply

:

9V alkaline battery (6LR61)
Battery life

:

When using alkaline battery, backlight off
Approx. 20 hours
Operating temperature and humidity: 0 ~ 50 °C (with no condensation)

≤

80% RH (0 ~ 30 °C)

≤

75% RH (30 ~ 40 °C)

≤

45% RH (40 ~ 50 °C)
Temperature coeffi cient: At 0 to 18 °C and 28 to 50 °C
Add 23±5 °C accuracy x 0.2 / °C
Storage temperature: -10 to 50 °C, 80% RH or less (remove the battery)
Withstand voltage: AC 6880 Vrms 5 sec. (between the core and the case)
AC 4300 Vrms 5 sec.
(between the core and the voltage input terminals)
AC 6880 Vrms 5 sec.
(between the voltage input terminals and the case)
Insulation resistance: 100MΩ or greater at 1000 VDC

(between the core and the case, the core and the voltage input
terminals and the voltage input terminals and the case)

Compliant standards:

Safety standards: EN 61010-1, EN 61010-2-032
1000V CAT.III, 600V CAT.IV
EN 61010-031 (the test leads)
Pollution degree 2, Indoor use, Altitude 2000m or less
EMC standards: EN 61326-1, EN 61326-2-1, EN 61326-2-2,

EN 55011
Dimensions: Approx 87.5 mm(W) x 242 mm(L) x 51 mm(D)
Diameter of measurable conductors

: ϕ

37mm (Maximum)

Weight

:

Approx. 435g (including the battery)

Accessories

:

Test leads 1set (Red and Black)
Carrying case
9V alkaline battery (6LR61)
User’s Manual
Accessories (Sold Separtely): Lead with Alligator Clip Model code 99014