Sanwa DCM301 Manual

Sanwa Måleudstyr DCM301

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02-2302 2040 6014

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[1] SAFETY PRECAUTIONS

*Before use, read the following safety

precautions.

This instruction manual explains how to use

your digital clamp meter DCM301. Before use,

please read this manual thoroughly to ensure

correct and safe use. After reading it, keep it

together with the product for reference to it

when necessary.

Using the product in a manner not specified in

this manual may cause damage to the protection

function of the product.

The instructions given under the headings of

WARNING and CAUTION must be followed

to prevent accidental and burn electric shock.

1-1 Explanation of Warning Symbols

The meanings of the symbols used in this

manual and attached to the product are as

follows:

: Very important instructions for safe use.

• The warning messages are intended to

prevent accidents to operating personnel

such as burn and electric shock.

• The caution messages are intended to

prevent incorrect handling which may

damage the product.

: High voltage hazard : Ground

: Resistance : Buzzer

: Light : Capacitor

: Double insulation or reinforced insulation

1-2 Warning Messages for Safe Use

The following instructions are intended to

prevent personal injury such as burn and

electric shock.

Be sure to follow them when using the meter.

1. This is a clamp meter for low-voltage

circuits. Never use it on a power line that

exceeds 1000 Vrms voltage to ground.

2. Voltages over AC 30 Vrms (42.4 Vpeak)

or DC 60 V are hazardous to human

body. Take care so as not to touch them.

3. Never input signals exceeding the

maximum rated input value (see 1-3).

4. Never use the meter near equipment

which generates strong electromagnetic

waves or is charged.

5. Never use the meter if the meter or test

leads are damaged or broken.

6. Never use the meter with the case or

battery lid removed.

7. During measurement, keep your fingers

behind the finger guard of test leads

and the barrier of the meter.

8. During measurement, do not change

function switch of the meter.

9. Before starting measurement, make

sure that the function and range are

properly set.

10. Never use the meter when it is wet or

with wet hands.

11.

Be sure to use the specified type of test leads.

12. Never attempt repair or modification,

except for battery replacement.

13. Always conduct start-up inspection and

check the meter at least once a year.

14. This meter is for indoor use only.

1-3 Maximum Overload Protection Input

The maximum rated input value and overload

protection have been established for the input

terminals of each function.

Function

Signal Input

Terminal

Max. Rated

Input Value

Max. Overload

Protection

ACA

Clamp type

current

sensor (CT)

1000 Arms

, ,

Between +

and –

terminals

Do not input

voltage DC/AC

1000 Vrms

ACV,

DCV, EF

DC/AC

1000 Vrms

[2] APPLICATIONS AND FEATURES

2-1 Applications

This is a digital AC clamp meter designed for

measurement of low-voltage circuits in the

application range of 1000 V CAT. III, 600 V CAT.

IV. It is suited to current and voltage measurement

of power lines, electrical equipment, and electrical

facilities less than 1000 Vrms to ground.

2-2 Features

• The CT shape makes it easier to clamp cable

in crowded.

•

Complies with IEC61010 CAT. IV and can

measure up to 1000 A AC for use in various sites.

• True RMS reading for measurement of even

distorted waveforms.

• An electric field (EF) function is incorporated

in the tip of the CT to enable detection of

about AC 90V or more.

•

Clamp opening diameter of 34 mm at maximum.

• Large, easy-to-press HOLD button.

•

Equipped with LCD backlight convenient for

measurement in dark places. Also incorporates an

LED light to illuminate the measurement target.

Measurement categories (Overvoltage

categories)

CAT. II :

Primary circuit of equipment with a power

cord to be connected to a mains socket.

CAT.III :

Primary circuit of equipment that inputs power

directly from the distributor and the circuit

from the distributor to the mains socket.

CAT.IV :

Circuit from the leading wire to the distributor.

[3] NAMES OF COMPONENT UNITS

3-1 Main unit

3-2 Display

VAΩm

HOLDAUTO

nµ FMk Hz

3-3 Test Lead

In case of test pins cover attached:

CAT.IV 600 V, CAT.III 1000 V

In case of test pins cover removed:

CAT.II 1000 V

[4] DESCRIPTION OF FUNCTION

4-1 Power Switch and function switch

(for all functions)

Turn this switch to turn on and off the power

and select a measuring function.

4-2 Data Hold function: HOLD button

(for functions except EF)

When the HOLD button is pressed, the reading

indicated will be held with on the

display. The indicated reading will not change if

the input signal is changed. When this button is

pressed again, the function will be disabled and

the meter will return to the measurement mode.

Remarks:

• The function will be canceled at changing

measurement functions.

4-3 LIGHT function: Light button

Press the LIGHT button to turn on the display’s

backlight and the LED light. Press it again to

turn them off. The lights will go off automatically

after 30 seconds.

4-4

How to select the measurement function:

SELECT button (ACA, , ACV)

Press the SELECT button to cycle through the

functions in the order shown below.

　ACA : ACA → Hz → ACA

　 : → →

　ACV : ACV → Hz → ACV

4-5 Range Hold function:

RANGE HOLD button (ACA, , ACV, DCV)

Press the RANGE HOLD button to enter the

Manual mode and set the range ( AUTO in the

display disappears). In the Manual mode, the

range changes every time this button is pressed.

Select the appropriate range while checking the

displayed unit and position of the decimal point

in the digits. To restore the Auto Range mode,

press and hold this button for more than 1

second ( AUTO is displayed in the display).

4-6

Relative function:

RELATIVE button (ACA, , ACV, DCV)

Press the RELATIVE button; “ ” will be

displayed in the display and the digits will show

a relative value — which is derived from the

input value when the button is pressed set at 0

(reference). Press the button again to cancel

this function.

4-7 AUTO POWER OFF function

The meter will go to AUTO POWER OFF function

to save battery life about 10 minutes after the

last function switch or button operation. To wake

up the meter, press any button or re-power on.

turns on while activating the function.

Remarks:

• Even in the AUTO POWER OFF mode, the tiny

power is still consumed. When the meter is not

going to be used for an extended period of

time, be sure to turn off the power switch.

• To disable the function, turn on the power of

meter while holding the SELECT button

pressed. on the display is turned off when

the AUTO POWER OFF function is disabled.

4-8 Low Battery indication

W h en t he b u il t - i n b a t t e r i es h a ve b e en

discharged and the voltage has dropped to

below about 3.6 V, appears on the display.

When the mark flickers or lights, replace both

three batteries with new ones.

[5] MEASURING PROCEDURE

5-1 Start-up Inspection

A l w ays p er for m t h e f o l lowi n g s t a r t - u p

inspection to ensure safety.

• External appearance: Make sure that there

are no visible abnormalities on the meter that

may have been caused by dropping it or

other mishandling.

• Accessories: Make sure that the test leads

a n d o t h e r a c c e s s or i e s a r e f r e e f r o m

breakage, cracks, or any damage.

• Make sure that the low battery indication is

not di s p l ayed in t h e dis p l a y. If is

displayed, replace the batteries with new

ones. Before first use, install the batteries.

• Make sure that neither the meter nor your

hand is wet.

* If nothing is displayed in the display, the

batteries may be drained.

5-2 AC Current / Frequency Measurement:

ACA / Hz

Remove the test leads from the measuring

terminals to avoid electric shock.

Function Max. Rated Input Value

ACA 1000 A

Hz 2 kHz

DIGITAL CLAMP METER

INSTRUCTION MANUAL

DCM301

Remarks:

•

Clamp the conductor (cable) to measure in the

middle of the center position mark on the CT.

•

Clamp only one cable. If several cables are

clam ped together or du pl ex, t riplex or

quadruplex cable are clamped, current

cannot be measured accurately.

•

The meter may malfunction in places where a

strong magnetic field is present.

•

Do not apply voltage and current at the same time.

5-3 Capacitance Measurement:

Never apply a voltage to the input terminals.

1. Di s c h a r g e t h e c a p a c i t o r s b e f or e

measurement.

2. This meter uses a measurement method

that applies currents to the measured

capacitor. It is not suitable for measurement

of electrolytic capacitors with high leakage

currents since errors will be too large.

3. It takes longer to measure capacitors with

large capacitance.

Function Max. Rated Input Value

60.00 mF

＋−

5-4 Resistance Measurement, Continuity

Check: ・

Never apply a voltage to the input terminals.

Function Max. Rated Input Value

60.00 MΩ

600.0 Ω

Dempa Bldg., 4-4 Sotokanda 2-Chome Chiyoda-ku, Tokyo, Japan

- MEMO - WARNING

WARNING

CAUTION

WARNING

AUTO RANGE

Continuity

check

Polarity

(-)

Decimal

point

Digit

Relative value UNIT

DATA HOLD

Removal test pins cover Test probe(red)

Test probe(black)

Test pins

Finger

guards

Plugs

Low battery

indication

AUTO POWER OFF

Clamp type current

sensor (CT)

LED light

Center position mark

Electric Field (EF)

sensor position mark

Power /

Function switch

EF detection LED

Barrier

CT trigger

Light button

HOLD button

Display

RANGEHOLD button

SELECT button

RELATIVE button

Input Terminal ( - )

Input Terminal (+)

Produkt Specifikationer

Mærke:	Sanwa
Kategori:	Måleudstyr
Model:	DCM301

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