Sanwa DCL31DR Manual

Sanwa Meetapparatuur DCL31DR

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DCL31DR

01-1507 2040 6011

DIGITAL CLAMP METER

INSTRUCTION MANUAL

Dempa Bldg., 4-4 Sotokanda 2-Chome

Chiyoda-ku, Tokyo, Japan

This manual emplys soy ink.

[1] SAFETY PRECAUTIONS

Before use, read the following safety precautions

This instruction manual explains how to safely use your new DCL31DR digital

clamp meter. Before use, please read this manual thoroughly. After reading it,

keep it together with the product so you can refer to it when necessary. If this

product is not used as specified in this manual, its protection function may be

compromised.

To avoid accidental burns or electric shock, always follow any instructions with

“ WARNING” or “ CAUTION” headings.

1-1 Explanation of Warning Symbols

The meanings of the symbols used in this manual and on the product are

explained below.

　 : Very important instructions for safe use.

•Warning messages are intended to prevent accidents to operating

personnel such as burn and electric shock.

•Caution messages are intended to prevent damage to the instrument.

The meanings of the symbols used exclusively on the product are explained below.

: Symbol requesting reference to the instruction manual before use

: Potential of connection to a power line in live status

: Double in sulation or reinforced insulation

: Power switch : Backlight

1-2 Warning Instructions for Safe Use

To avoid physical injury such as burns or electric shock, be sure to

observe the following instructions when using this instrument.

1. This instrument is a digital clamp meter for low voltages. It should be

used on power lines with a voltage to ground of 300 Vrms or less.

2. Pay special attention when measuring voltages of AC 33 Vrms (46.7 V

peak) or DC 70 V or more to avoid injury. Also use insulating protective

equipment as required.

3. Never use the instrument on power lines that exceed the maximum

rated input current (see 1-3).

4. Do not use the instrument if the main unit is damaged or broken.

5. Do not use the instrument with the case or battery compartment cover

removed.

6. Do not hold the measurement clip at any point beyond the barrier.

Before performing measurement, make sure that the function is properly set.

8. Do not use the instrument when it or your hand is wet.

9. Do not attempt to repair or modify the instrument except to replace the

batteries.

Be sure to check the instrument before each use and inspect it at least

once a year.

11. Always use the instrument indoors.

To avoid compromising the protection function of this instrument, do

not use it in any way other than instructed in this manual.

Voltage to ground of 300 Vrms or less: When the Y-connection voltage is 415 V,

the voltage to ground is equal to 415 / 3

≒

240 V.

1-3 Overload Protection Input Values

Input Max. rated input current Max. overload protection input

Clamp sensor

AC AC/DC 420 A /DC 450 A

[2] APPLICATIONS AND FEATURES

2-1 Applications

This instrument is an AC/DC clamp meter with RMS response that allows you

to measure the current range specified in IEC 61010-1 CAT. III 300 V. It is

suitable for measuring the current of low-voltage power lines and electrical

appliances, etc.

WARNING

2-2 Features

• Safety design that complies with IEC61010-1 CAT. III 300 V

• Compact pocket size

• AC/DC compatible clamp meter

• DC+AC (True RMS) function

• Auto power OFF (approx. 15 min.) (Disabling also possible)

• Backlight

Measurement Category (Overvoltage Category)

Equipment of CAT II :

Primary cable runs of power-consuming equipment from a wall socket.

Equipment of CAT III :

Primary cable runs of equipment directly connected to a distribution board

and cable runs from a distribution board to wall sockets.

Equipment of CAT IV :

Cable runs from an incoming line to a distribution board.

[3]

NAME OF COMPONENT UNITS

3-1 Main unit

3-2 Display

[4]

DESCRIPTION OF FUNCTIONS

4-1 Power button: button

Press the button to switch the power ON and OFF.

4-2 Auto power OFF function

The instrument incorporates the auto power OFF function that turns the

instrument OFF in about 15 minutes after the last operation. This function can

be disabled by switching the instrument ON while holding the button. The

indicator on the display panel is extinguished when the auto power OFF

functions is disabled.

4-3 Low battery indication

The indicator lights on the display when the batteries have discharged

down to a supply voltage of about 2.3 V or less. Replace the batteries when

this indicator lights up.

4-4 Data hold: HOLD/PEAK button

Press the button shortly. The

indicator lights on the display and

the value displayed at that time is held and will not change even if the

measurement data varies. Pressing the button shortly again extinguishes the

indicator and the measurement data is no longer held.

* The held data is cleared when the function is switched by pressing the

SELECT button.

4-5 Function switching: SELECT button

Each press of this button switches the measurement function in sequence of

AC DC DC AC AC → → → …→

4-6 Zero setting: ZERO button　

When the ZERO button is pressed while the function is DC or DC+AC

selected, the indicator lights on the display and the current input value is

displayed as zero. Pressing the ZERO button again cancels the zero setting.

* This button is disabled while the AC function is selected.

4-7 Backlight function button:

Press this button to light the backlight of the display. Pressing the button again

extinguishes the backlight. The backlight is also extinguished automatically in

about 10 seconds after it is lit.

4-8 Peak hold: HOLD/PEAK button

When the button is held depressed (for more than 1 sec.) during the HOLD/PEAK

voltage or current measurement, the indicator lights on the display and the PEAK

Peak Hold mode fixed at the 400.0 A range is started. Holding the button

depressed again cancels the Peak Hold mode. In the Peak Hold mode, the peak

value of input waveform is held at intervals of 1 msec. The held value is updated

whenever a higher value is input but not updated at lower values. For instance,

when the input is a 100 A sine wave AC, the peak value is about 141 A ( 2 times

the rated value).

• Almost the same values are displayed with both the AC and DC functions.

• Peak Hold does not work with the negative (-) input with both the AC and DC

functions.

• When the HOLD/PEAK button is pressed in the Peak Hold mode, the and PEAK

indicators light and the value displayed at that moment is held. Even

when the displayed value is held, the peak value continues to be updated

internally so, when the HOLD/PEAK

button is pressed again to release the held

value, the latest updated peak value is displayed.

• The Peak Hold mode is canceled when the function switch is switched.

Examples of peak hold measurement:

* The peak value of the negative (-) current is not held.

DC current peak

AC current peak

Measurement impossible

Measurement possible

DC+AC current peak

Measurement impossible

Measurement possible

4-9 AC Detection method

This meter employs the root-mean-square value method and indicates the

magnitude of AC as the same amount of work as DC. Root-mean-square

values of sinusoidal waves and such non-sinusoidal waves as square waves

and chopping waves can be measured by the true RMS (Root Mean Square)

circuit. (The input signal measurement value is used as the scale of the actual

input signal power. It is therefore measured as a more effective value than the

value obtained by average detection.)

4-10 Crest factor

The CF (crest factor) indicates the peak value of a signal by dividing it by its

root-mean-square value. With most common waveforms such as sinusoidal

wave and chopping wave, the crest factor is low. With low duty cycle pulse

waveforms, the crest factor is high. For the voltages and crest factors for

typical waveforms, see the table below.

Input Waveform

0 to PEAK

Vrms

Average

Value Crest

Factor Form

Factor

Root Mean

Square Value

Vavg

Vp/Vrms

Vrms/Vavg

Sinusoidal

wave

Square

wave

Chopping

wave

Pulse

=1.414 =1.111

p p

－

√

=0.707 Vp

－

2 Vp

=0.637 Vp

√

－

√

2π

Vp Vp 1

2π

－

√

=0.577 Vp

－

=0.5 Vp

－

√

=1.155

√

=1.732

2π

－

2π

・

－

2π

・

－

2π

－

2π

Voltages of Various Waveforms

[5] MEASURING PROCEDURE

1. Do not apply an input voltage exceeding the maximum rated current.

2. During measurement, do not hold the measurement clip at any point

beyond the barrier.

5-1 Start-up inspection

Perform the following pre-operational check for safety.

•

Check the external appearance. Check that the main unit is free of abnormality

or damage due to dropping, etc.

•

Check that the test leads are free of irregularity such as wire disconnection or

crack.

•

Check that the indicator is not lit. If it is lit, replace the batteries with new ones.

• Make sure your hands and the instrument are not wet.

*If nothing is displayed on the LCD, the batteries might have been totally discharged.

5-2 Current measurements

1. To improve the measuring accuracy, position the conductor at the center

of the clamp sensor.

2. Always clamp only one wire at a time. Accurate measurement is impossible

if two or more wires, a cable with multiple conductors or a parallel cord is

clamped.

3. Accurate measurement is impossible if the clamp sensor is not closed

completely.

4. Accurate measurement is sometimes impossible near a source of strong

magnetic field such as a transformer or high-current line, near a source of

electromagnetic waves such as radio equipment or near a charged object.

5. The CT may generate an oscillating sound when a high current is applied.

This is not malfunction.

6. During measurement with the DC current (DCA) function, the reading may

vary by a few counts when the orientation (effect of the terrestrial magnetism)

or the ambient temperature of this instrument is changed significantly.

* Perform measurements using the clamp sensor. Each press of the button

switches the measurement function in sequence of AC → DC DC AC → →

AC →…

→

Clamping single conductor on the center of clamp sensor.

Clamping multiple conductors. Force applied to the tip of

clamp sensor.

Correct

○

Incorrect

Load

WARNING

CAUTION

Clamping current sensor

(CT)

Center position indication

Polarity

indicators

Barrier

HOLD/PEAK button

ZERO button

SELECT button

Data HOLD

Auto power OFF enabled

DC (Direct current)

Zero setting indicator

Polarity (-)

Trigger

Power button

Backlight button

LCD

PEAK measurement

mode

Low battery indication

Unit (ampere)

Numeric value & decimal point

AC (Alternate current)

− 2 − − 4 −− 1 − − 3 −

Produkt Specifikationer

Mærke:	Sanwa
Kategori:	Meetapparatuur
Model:	DCL31DR

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