MULTI MEASURING INSTRUMENTS M-270 Bedienungsanleitung

AC/DC CURRENT

DIGITAL CLAMP-ON TESTER

M-270

INSTRUCTION MANUAL

Thank you very much for selecting our digital AC/DC clamp-on

Tester M-270.

This model is complex instrument and employ a very reliable

mechanical/electronic design.

Before you use your new instrument, read this Instruction

Manual completely and familiarize yourself thoroughly with

all functions.

Keep this manual carefully to take out whenever you need.

1. FEATURES

●Low cost high performance and True RMS reading AC/DC clamp-on tester.

●4000 count full scale display.

●Additional AC/DC voltage, resistance, frequency test, diode test and

continuity check.

●Data hold and auto power off function.

●Convenient push switch for auto zero adjustment for DC current measurement.

2. △

!WARNING

●Do not make measurements of power lines carrying more than 250V.

IN SOME CASES, POWER LINES MAY CARRY VOLTAGE SPIKES OF

SEVERAL TIMES OF THE NORMAL SUPPLY VOLTAGE. THIS INSTRUMENT

SHOULD NOT BE USED TO MEASURE POWER LINES.

*The term of “POWER LINE”means the electrical circuit providing the power to

factories, buildings, and etc.

●Before operating this instrument, familiarize yourself with all instructions

outlined in this manual.

●Always check to make sure that the function switch is set to the proper position.

●When making measurements, use CAUTION as dangerous voltages may be

present in normally safe areas.

●To avoid electrical shock, use CAUTION when working above 60V DC or 25V AC

rms.

Such voltages pose a shock hazard.

●Never make measurements with the case opened.

●Never fail to keep the maximum tolerable input.

●Never operate this instrument if it becomes wet, damp or has any liquid

condensation build-up on any part of the instrument.

●Never make measurements for uninsulated conductors or bus bars.

3. SPECIFICATIONS

AC conversion: AC coupled true rms reading

Crest factor: <3 (0~50% of the range) <2 (50~100% of the range)

Safety standard : Meets the requirements for double insulation to IEC 1010-2-032,

IEC 61010-1, IEC 61010-2-032 installation CategoryⅢ600V phase to earth.

E.M.C. standard : The instrument meets EN 61326-1/-2-2 and EN 61000-4-2/-3

Withstanding voltage : AC 5500V, 1 minute (between outer case and core of CT)

Measuring method : Dual integration mode

Jaw opening capability : 55mmφ

Display : 3 1/2 digit LCD max. reading of 3999 and annunciators

Over range indication : Blanking of all digits except MSD1 (except for AC/DC 600V

And AC/DC 2000A ranges)

Low battery indication : "B" mark on LCD readout

Sampling : 2 times/sec.

Data hold indication : "D･H" mark on LCD readout

Auto power off : The meter is set to power off mode approx. 10 minutes after the power

switch on.

Operating temperature : 0℃to 40℃, ＜80%RH (non-condensing)

Strange temperature :‐10℃to 60℃, ＜70%RH (non-condensing)

Power supply : 1.5V (“ AAA” size, R03) x2

Power consumption and battery life : Approx. 25mW, 90 hours continuous.

Size : 85(W)x240(H)x34(D)mm

Weight : Approx. 350g

Accessories : Carrying case…………..1

Instruction manual……1

Batteries…………………2

Test lead…………………1set

4. DIMENSIONS AND PANEL FUNCTION

①Current transducer(Jaw) 85

②Jaw opening lever

③Power switch

④Function switch

⑤Range switch

⑥Sub-function switch (--/~,Ω/･)))

⑦Zero adjustment switch

⑧Data hold switch 240

⑨LCD display

⑩Input terminal(V)(Hz)

⑪COM terminal

⑫Input terminal(Ω)( ｜)

⑬Battery cover

⑭Wrist strap

Measuring range (23℃±5℃, ＜80% RH ) :

Range/Resolution

Accuracy

Max. input

~A (50/60Hz)

… A

Manual range

40A/0.01A

±2.0% rdg±8 dgt

AC/DC 2000A

400A/0.1A

±1.5% rdg±8 dgt

2000A/1A

(50/60Hz)

…V

Auto/manual

range

400mV/0.1mV

±1.2% rdg±5 dgt

AC/DC

600V rms

4V/0.001V

40V/0.01V

400V/0.1V

600V/1V

Frequency

Auto range

100Hz/0.01Hz

±0.5% rdg±3 dgt

AC/DC

600V rms

1000Hz/0.1Hz

10KHz/0.001KHz

100KHz/0.01KHz

1000KHz/0.1KHz

Resistance

400Ω/0.1Ω

±1.5% rdg±8 dgt

Input Protection

4KΩ/0.001KΩ

250V rms

40KΩ/0.01KΩ

400KΩ/0.1KΩ

4000KΩ/1KΩ

40MΩ/0.01MΩ

±3% rdg±10 dgt

･)))Continuity

check

400Ω/0.01Ω

Continuity beeper

＜Approx. 40Ω

250V rms

Diode test

±10% rdg±3 dgt

250V rms

5. METHOD OF MEASUREMENT

5-1. Measurement of Current

5-1-1 Measurement of DC Current

①Set the power switch to "ON" position.

②Set the function switch to a range appropriate

to the current to be measured.

③Press the zero adjustment switch once, the zero

display will be observed.

Note: When pressing the zero adjustment switch in

DC 40A range, even if the zero display is not

obtained for high sensitivity, however,

this is not abnormal and the accuracy is kept

in the tolerance.

④Clamp the conductor of the circuit at the center of CT. Fig.1

⑤Read the current value in the display.

⑥If you make measurements in a dark place

or in a place where it is difficult to see the

readings, use the data hold switch.

Note : Clamp around only one conductor of the circuit to be measured. (See Fig.1)

Over range value is moved due to the zero adjustment, however, this is not

abnormal.

To release the zero adjustment mode, press the zero adjustment switch at least

1 second.

5-1-2 Measurement of AC Current

①Set the power switch to "ON" position.

②Set the function switch to a range appropriate to the current to be measured.

③Press the sub-function switch for AC measurement, “~” mark is displayed.

④Clamp the conductor of the circuit at the center of CT.

⑤Read the current value in the display.

⑥If you make measurements in a dark place or in a place where it is difficult to

see the readings, use the data hold switch.

Note : Clamp around only one conductor of the circuit to be measured. (See Fig.1)

When making the clamp measurements for high AC current, the noise sound

of CT may be caused, however, this is not abnormal.

△

!WARNING

●To avoid electrical shock or damage, the measurement is limited to the circuit

under 600V AC.

Such voltages pose a shock hazard.

●Never fail to keep the maximum 2000A input to avoid electrical shock or damage.

●Never make measurements for uninsulated conductors or bus bars.

5-2. Measurement of Voltage

5-2-1. Measurement of AC Voltage

Black Red +

①Set the power switch to "ON" position.

②Connect the plug of red test lead into

the “V”terminal and the plug of black

test lead into the “COM”terminal.

③Set the function switch to “~V”range.

The auto ranging mode is selected.

④Contact the tips of the test leads to the

circuit under test.

⑤Read the voltage value in the display.

Manual range mode: Fig. 2

Press the range switch to the manual range mode.

the instrument changes from the auto range to the manual ranging mode and

the range is held. Subsequent pressing of switch causes the up-and down-ranging

as below.

4V →40V →400V →600V →400mV↓

↑──────────────────

To return to the auto ranging mode, press the range switch at least one second.

5-2-2. Measurement of DC Voltage

①Set the power switch to "ON" position.

②Connect the plug of red test lead into the “V”terminal and the plug of black test

lead into the “COM”terminal.

③Set the range selector switch to “…V”range. The auto ranging mode is selected.

④Contact the tips of the test leads to the circuit under test.

⑤Read the voltage value in the display.

Manual range mode:

Press the range switch to select the manual range mode. The instruments changes

from the auto ranging to the manual ranging mode and the range is held.

Subsequent pressing of the switch caused the up- and down-ranging as below.

400mV →4V →40V →400V →600V ↓

↑───────────────────

To return to the auto ranging mode, press the range switch at least one second.

△

!WARNING

Do not make measurements of power lines carrying more than 250V.

IN SOME CASES, POWER LINES MAY CARRY VOLTAGE SPIKES OF

SEVERAL TIMES OF THE NORMAL SUPPLY VOLTAGE. THIS

INSTRUMENT SHOULD NOT BE USED TO MEASURE POWER LINES.

* The term of “POWER LINE”means the electrical circuit providing the

power to factories, buildings and etc.

△

!WARNING

POSSIBLE ELECTRICAL SHOCK. Do not make measurements if the case

is damaged or the rear case is removed. Remove all electrical inputs before

removing the rear case.

△

!WARNING

POSSIBLE ELECTRICAL SHOCK or FIRE HAZARD. Do not expose this

tester to rain or moisture. Do not operate the tester in the presence of

flammable gases or fumes.

△

!CAUTION

To avoid damage to the tester, disconnect test leads before changing

functions. Do not exceed the maximum input limits.

5-3. Measurement of Resistance and Continuity Check Red + Black

①Set the power switch to "ON" position.

②Connect the plug of red test lead into

the “Ω”terminal and the plug of black

test lead into the “COM”terminal.

③Set the function switch to “Ω”range.

The auto ranging mode is selected

④Contact the tips of the teat leads to the circuit under test.

⑤Read the resistance value in the display.

Fig.3

To select the continuity check, press the sub-function switch and “･)))” mark is displayed.

In the continuity check mode, if the circuit under test has a resistance of less than

approximately 40Ω, the continuity beeper will sound.

Manual range mode:

Press the range switch to select the manual range mode. The instruments changes

from the auto ranging to the manual ranging mode and the range is held.

Subsequent pressing of the switch caused the up- and down-ranging as below.

40MΩ→400Ω→4KΩ→40KΩ→400KΩ→4000KΩ↓

↑────────────────────────────

To return to the auto ranging mode, press the range switch at least one second.

△

!CAUTION

Be sure all voltage is turned OFF in the circuit before making resistance

measurement.

5-4. Measurement of Frequency (Hz)

①Set the power switch to “ON” position.

②Connect the plug of red test lead into the “Hz” terminal and the plug of black test

lead into the “COM” terminal.

③Set the function switch to “Hz” range. The auto ranging mode is selected and the

input sensitivity is set to 10mV.

④Press the range switch to select the input sensitivity.

Subsequent pressing of the switch changes the sensitivity as below

10mV →100mV →1V↓

↑───────────

⑤Contact the tips of the test leads to the circuit under test.

⑥Read the frequency value in the display.

△

!WARNING

Do not make measurements of power lines carrying more than 250V.

IN SOME CASES, POWER LINES MAY CARRY VOLTAGE SPIKES OF

SEVERAL TIMES OF THE NORMAL SUPPLY VOLTAGE. THIS

INSTRUMENT SHOULD NOT BE USED TO MEASURE POWER LINES.

* The term of “POWER LINE” means the electrical circuit providing the

power to factories, buildings and etc.

5-5. Measurement of Diode

①Set the power switch to "ON" position.

②Connect the plug of red test lead into the “｜”terminal and the plug of black

test lead into the “COM”terminal.

③Set the range selector switch to “｜”range.

④Contact the tips of the test leads to the diode under test.

(a)Forward voltage (b)Reverse Voltage

measurement measurement

Black Red Red Black

Fig. 4

As shown in Fig.4 (a), when measuring the forward voltage across the diode, a

normal diode will indicate 0.4 to 0.7V and, as shown in Fig.4 (b) the reverse voltage

will indicate a value near 3.000V. For a short-circuited diode, a value near 0mV will

be displayed.

△

!CAUTION

Be sure all voltage is turned OFF in the circuit before making diode test.

6. REPLACEMENT OF BATTERIES

When the battery voltage falls below a specified voltage value, the "B" mark will

appear in the display. If this occurs, replace the two batteries with new ones as

quickly as possible.

Turn the power switch to "OFF", prior

to installing batteries.

To install the batteries, remove the

battery cover located on the unit back.

Loosen the screw on the battery cover.

Replace the two batteries (UM-4 or

type AAA) with new ones, observing

polarity. Use high-quality batteries

which are guaranteed against leakage. OPEN

If the instrument is to be left unused

for long periods of time, to prevent

damage from leakage, remove the batteries. Battery Cover

△

!WARNING

POSSIBLE ELECTRICAL SHOCK AND FIRE HAZARD

Do not replace the batteries, clamping CT to the conductor or during voltage

measurement.

Do not use the instrument keeping battery cover off.

7. REPAIR SERVICE

When making requests for repair service, please bring the instrument directly to the

dealer. If this is impossible, however, send the instrument directly to our sales office.

When mailing this instrument, always pack it in its original or equivalent packing

material and pack together with name, address, telephone number and the warranty

documentation.

●To ensure speedy and reliable repair, always include information as the type of

failure and cause.

●If required, always return accessories with the instrument.

●When contacting us, provide the model number and serial number of your

instrument.

8. WARRANTY

This instrument is sent out from our factory after the sufficient internal inspections

but if you find any defect due to the fault in our workmanship or the original parts,

please contact the dealer where you bought the instrument.

The warranty period is 12 months from the date of purchase and the instrument

shall be repaired at free of charge, provided that we judge the cause of defect is

obviously resulted from our responsibility.

MULTI MEASURING INSTRUMENTS CO.,LTD.

Akihabara Murai Bldg. 7F, 1-26 Kanda Sakuma-cho,

Chiyoda-ku, Tokyo, Japan, 101-0025

TEL : +81-3-3251-7016 FAX : +81-3-3253-4278

Home Page : http://www.mutimic.com/

E-mail : multi@multimic.com

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