Mastech MS2108A Manuale utente

AC/DC

DIGITA CLAMP METER

OPERATION MANUAL

CONTENTS

1. SAFETY INFORMATION ……1

1.1 PRELIMINARY ……1

1.2 DURING USE ……2

1.3 SYMBOLS ……3

1.4 MAINTENANCE ……3

2. DESCRIPTION ……4

2.1 NAMES OF PARTS ……5

2.2

SWITCH, BUTTONS AND INPUT JACKS

……8

2.3 LCD (Liquid-crystal display) ……8

3. SPECIFICATIONS ……10

3.1 GENERAL SPECIFICATIONS ……10

3.2 TECHNICAL SPECIFICATIONS ……11

4. OPERATION INSTRUCTION ……16

4.1 HOLDING READINGS ……16

4.2 SWITCHING REL ……16

4.3 SWITCHING FREQUENCY OR DUTY ……17

4.4 SWITCHING

MAXIMUM OR

MINIMUM VALUE

……17

4.5 SWITCHING FUNCTIONS ……18

4.6 BACK LIGHT AND

CLAMP LIGHTING

BULB

……18

4.7 AUTO POWER OFF ……19

4.8 PREPARING FOR MEASUREMENT ……19

4.9 MEASURING AC CURRENT ……20

4.10 MEASURING DC CURRENT ……21

CONTENTS

4.11 MEASURING AC VOLTAGE ……23

4.12 MEASURING DC VOLTAGE ……24

4.13 MEASURING FREQUENCY ……26

4.14 MEASURING DUTY ……29

4.15 MEASURING RESISTANCE ……33

4.16 TESTING DIODE ……35

4.17 TESTING CONTINUITY ……36

4.18 MEASURING CAPACITANCE ……37

5. MAINTENANCE ……39

5.1 REPLACING THE BATTERIES ……39

5.2 REPLACING TEST LEADS ……39

6. ACCESSORIES ……39

1. SAFETY INFORMATION

WARNING

BE EXTREMELY CAREFUL WHEN USING THIS

METER. Improper use of this device can result in electric

shock or destruction of the meter. Take all normal safety

precautions and follow the safeguards suggested in this

manual.

To exploit full functionality of the meter and ensure safe

operation, please read carefully and follow the directions in

this manual.

This meter has been designed according to IEC-1010 concerning

electronic measuring instruments with an overvoltage category

CAT ΙΙΙ 600V and pollution 2.

Follow all safety and operating instructions to ensure safe use of

the meter.

With proper use and care, this digital multimeter will give you

years of satisfactory service.

1.1 PRELIMINARY

1.1.1 When using the meter, the user must observe all normal safety

rules concerning:

- General protection against electric shock

- Protection of the meter against misuse

1.1.2 When the meter is delivered, check whether it has been

damaged in transit.

1.1.3 After being stored and delivered under harsh conditions, the

meter should be checked and confirmed whether any damages

- 1 -

have been incurred.

1.1.4 Test leads must be kept in good condition. Before using check

whether the insulation on test leads has been damaged and any

wire has been exposed.

1.1.5 Use the test leads supplied to ensure operation safety. If

required, they must be replaced with test leads of the same

model or class.

1.2 DURING USE

1.2.1 Use the right input jack, function and range.

1.2.2 Do not take measurements that exceed the protection limit

values indicated in the specifications.

1.2.3 Do not touch the metal tips of the test leads when the meter is

connected to the circuit to be measured.

1.2.4 Keep your fingers behind the probe barriers when taking a

measurement with an effective voltage above 60V DC or 30V

rms AC.

1.2.5 Do not take voltage measurement if the value between the

terminals and earth ground exceeds 600V.

1.2.6 Select the highest range if the value scale to be measured in

the manual range is unknown.

1.2.7 Disconnect the test leads from the circuit under test before

turning the rotary selector to change functions.

1.2.8 Do not measure the resistance

，

capacitance, diode or

continuity of live circuits.

1.2.9 Do not connect the meter to any voltage source while the

rotary selector is in the current, resistance, capacitance, diode

or continuity range.

- 2 -

1.2.10 Do not take capacitance measurements until the capacitor to

be measured has been fully discharged.

1.2.11 Do not use the meter near explosive gases, steam or dirt.

1.2.12 Stop using the meter if any abnormalities or faults are

observed.

1.2.13 Do not use the meter unless its rear case and battery cover is

securely fastened in its original position.

1.2.14 Do not store or use the meter in areas exposed to direct

sunlight, at high temperature or with high relative humidity.

1.3 SYMBOLS

Caution, risk of danger (Important safety information; refer

to the operation manual.)

Application around and removal from HAZARDOUS

LIVE conductors is permitted.

Double insulation

（

Protection class II

）

CAT III Overvoltage (Installation) category III, Pollution

Degree 2 per IEC1010-1 refers to the level of Impulse

Withstand Voltage protection provided.

Conforms to European Union Directive

Earth (ground) terminal

1.4 MAINTENANCE

1.4.1 Do not attempt to remove the rear case to adjust or repair the

meter. Such actions should only be performed by a technician

who fully understands the meter and the danger involved.

1.4.2 Before opening the case and battery cover of the meter,

always disconnect test leads from all sources of electric

-3 -

current. Disconnect the test leads from all sources of electric

current before opening the rear case and battery cover of the meter.

1.4.3 To avoid any electric shock caused by error readings, replace

the batteries immediately when the “ ” sign appears on the

display.

1.4.4 Use damp cloth and mild detergent to clean the meter; do not

use abrasives or solvents.

1.4.5 Turn the rotary selector to OFF position to switch off the

power when the meter is not in use.

1.4.6 Remove the batteries to avoid damages to the meter if it will

idle for a long time.

2. DESCRIPTION

- This meter is a portable professional measuring instrument with

LCD and back light easily reading. The ‘single-hand operation’

design for the range switch makes measurement simple and easy.

Overload protection and low battery indication are provided. It

is an ideal multi-function Instrument with scores of practical

applications for professional, workshop, school, hobby and

home use.

- The meter can perform measurements of AC/DC voltage and

current, resistance

，

frequency, duty, capacitance, as well as

continuity and diode test.

- auto range is available.

- This meter is equipped with reading hold function.

- This meter is equipped with square value measuring function (at

AC A and AC V range).

- This meter is equipped with auto zero function (at DCA range).

- This meter is equipped with maximum value measuring

- 4 -

function.

- This meter is equipped with minimum value measuring

function.

- This meter can measure frequency by clamp.

- This meter has function of auto power off.

2.1 NAMES OF COMPONENTS

⑴

Current Clamp

⑵

Clamp Lighting Bulb

⑶

Panel

⑷

Trigger

⑸

Function Switch Button (SEL)

⑹

MAX/MIN Switch Button (MAX/MIN)

⑺

Relative Switch Button (REL)

⑻

Liquid Crystal Display (LCD)

⑼

COM Jack

⑽

Input Jack

⑾

Hz/Duty Switch Button (Hz/%)

⑿

Reading Hold/Back Light Button (HOLD/B.L)

⒀

Rotary selector

⒁

OFF - power switch

⒂

“+” Symbol

⒃

“-” Symbol

⒄

Rear Case

⒅

Fixing Screw of Battery Cover

⒆

Battery Cover

- 5 -

- 6 -

- 7 -

2.2 SWITCH, BUTTONS AND INPUT JACKS

HOLD/B.L Button

- For holding the reading or control backlight

SEL Button

- For switching among measuring functions

REL Button

- The key is the relative value measurement.

Hz/% Button

- For switching between frequency and duty measuring functions.

MAX/MIN Button

- For switching between maximum and minimum value

measuring function.

Rotary Selector

- For selecting functions and ranges.

OFF Position

- for turning off the power.

INPUT Jack

- For measuring voltage, resistance, frequency, duty, capacitance,

diode, and continuity.

COM Jack

- Common input connection for current, voltage, resistance,

frequency, duty, capacitance, diode, continuity measurement.

Clamp

- For measuring current

2.3 LCD (Liquid-crystal display)

- 8 -

ALTERNATING CURRENT

Direct current

Diode test

Continuity buzzer

AUTO Auto range mode

MAX The maximum value is being measured

MIN The minimum value is being measured.

REL DCA zero and relative measure

Aotu power off

Battery low

This indicates that the display data is being

held.

% Percent (Duty cycle)

mV, V Milli-volts, Volts (Voltage)

A Amperes (Current)

nF, µF Nanofarad

，

Microfarad

Ω,kΩ, MΩOhms,Kilo-ohms,Mega-ohms (Resistance)

Hz, kHz,MHz Hertz, Kilo-hertz (Frequency)

，

Milohertz

- 9-

3. SPECIFICATIONS

Calibration is required once a year, to be carried out at a

temperature between 18°C and 28 °C (64°F to 82°F) and relative

humidity below 75%.

3.1 GENERAL SPECIFICATIONS

3.1.1 Auto range.

3.1.2 Overrange protection is provided for all ranges.

3.1.3 Maximum voltage between terminals and earth ground:

1000V DC or 750V rms AC

3.1.4 Operating altitude: max. 2000 meters (7000 ft.)

3.1.5 Display: 4000 counts with analog bar LCD display

3.1.6 Maximum value display: 4000 digits

3.1.7 Polarity indication: automatic; ‘-‘ for negative polarity.

3.1.8 Overrange indication: ‘0L’ or ‘-0L’

3.1.9 Converter Rate: 3 times/sec; Bar graph: 30 times/sec.

3.1.10 Unit indication: function and unit.

3.1.11 Auto power off time: 15 minute.

3.1.12 Operating power : 1.5V×3 AAA batteries

3.1.13 Battery low indication: ‘ ’ on LCD

3.1.14 Temperature factor: < 0.1×Accuracy /

℃

3.1.15 Operating temperature: 0

℃

to 40

℃

（

32°F to 104°F

）

3.1.16 Storage temperature: -10

℃

to 50

℃

（

10°F to 122°F

）

3.1.17 Dimension: 208×78×35mm

3.1.18 Weight: approximate 340g

（

including batteries

）

- 10-

3.2 ELECTRICAL SPECIFICATIONS

Ambient temperature: 23±5

℃

Relative humidity: < 75%

3.2.1 AC Current

Range Resolution Accuracy

40A 0.01A ±

（

2.0% of rdg + 6 digits

）

400A 0.1A

- Max. input current: 400A AC

- Frequency range: 40 to 400Hz

- Response: average value

3.2.2 DC Current

Range Resolution Accuracy

40A 0.01A ±

（

2.0% of rdg + 6 digits

）

400A 0.1A

- Max. input current: 400A DC

3.2.3 DC Voltage

Range Resolution Accuracy

400mV 0.1mV ±(1 .0% of rdg + 2digits)

4V 0.001V

40V 0.01V ±(0.7% of rdg + 2digits)

400V 0.1V

1000V 1V ±

（

0.8%rdg+2dgt

）

- Input impedance: 10MΩ

- Max. input voltage: 1000V DC

NOTE:

At small voltage range, unsteady readings will appear before the

- 11-

test leads contact the circuit. This is normal because the meter is

highly sensitive. When the test leads contact the circuit, the true

reading will be shown.

3.2.4 AC Voltage

Range Resolution Accuracy

4V 0.001V

±(0.8% of rdg + 3digits)

40V 0.01V

400V 0.1V

750 1V ±(1% of rdg + 4digits)

- Input impedance: 10MΩ

- Max. input voltage: 750V rms AC

- Frequency range: 40 to 400Hz

- Response: average value

3.2.5 Frequency

3.2.5.1 By A range ( from current clamp):

Range Resolution Accuracy

10Hz 0.01Hz

（

1.5% of rdg + 5 digits

）

1kHz 0.001KHz

>1kHz 0.001KHz

- Measurement range: 10 ~ 1kHz

- Input current range: ≥4A rms AC (higher input current at higher

frequency)

- Max. Input current: 400A rms AC

3.2.5.2 By ACV range:

- 12 -

Range Resolution Accuracy

10Hz 0.01Hz

1kHz 0.001kHz ±

（

1.5% of rdg + 5 digits

）

10kHz 0.01kHz

>10kHz 0.01kHz Take it only as referance

- Measurement range: 10 ~ 10kHz

- Input voltage range: ≥0.6V rms AC (higher input voltage at

higher frequency)

- Input impedance: 10MΩ

- Max. input voltage: 750V rms AC

3.2.5.3 By Hz/DUTY range

Range Resolution Accuracy

9.999Hz 0.001Hz

（

0.5% of rdg+3 digits

）

99.99Hz 0.01Hz

999.9Hz 0.1Hz

9.999KHz 0.001 KHz

99.99KHz 0.01 KHz

999.9KHz 0.1 KHz

9.999MHz 0.001MHz

- Overload protection: 250V dc or 250V ac rms.

- Input Voltage range: 200mV-10V ac rms

3.2.6 Duty Cycle

Range Resolution Accuracy

0.1% - 99% 0.1% ±3.0%

3.2.6.1 By A range ( from current clamp):

- Frequency response: 10 ~1kHz

- Input current range: ≥4A rms AC

- Max. input current: 400A

3.2.6.2 By ACV range:

- 13 -

- Frequency response: 10 ~ 10 kHz

- Input voltage range: ≥1 V rms AC

- Input impedance: 10MΩ

- Max. input voltage: 750V rms AC

3.2.6.3 By Hz/DUTY range

- Frequency response: 1 ~ 10MHz

- Input voltage range: ≥500mV rms

- Overload protection: 250V rms AC

3.2.7 Resistance

Range Resolution Accuracy

400Ω0.1Ω

±(0.8% of rdg + 3digits)

4kΩ0.001kΩ

40kΩ0.01kΩ

400kΩ0.1kΩ

4MΩ0.001MkΩ

40MΩ0.1MΩ±(1.2% of rdg + 3digits)

- Open circuit voltage: 0.4V

- Overload protection: 250V DC or rms AC

3.2.8 Diode

Range Resolution Function

0.001V Displaying approximate forward

voltage of diode

- Forward DC current ~ 1mA

- Reversed DC voltage ~ 3.3V

- Overload protection: 250V DC or rms AC

- 14 -

3.2.9 Continuity

Range Resolution Function

0. 1ΩBuilt-in buzzer will sound, if

resistance is lower than 40Ω.

- Open circuit voltage ~ 1.2V

- Overload protection: 250V DC or rms AC

3.2.10 Capacitance

Range Resolution Accuracy

40nF 0.01nF

400nF 0.1nF

4µF 0.001µF ±

（

4.0% of rdg + 5 digits

）

40µF 0.01µF

400µF 0.1µF

4000µF 1µF

- Overload protection: 250V DC or rms AC

- 15 -

4. OPERATION INSTRUCTION

4.1 HOLDING READINGS

4.1.1 Press the “HOLD/B.L” button to hold the readings while

taking measurement and the value on the display will be held.

4.1.2 Press the “HOLD/B.L” button again to release the reading

hold function.

4.2 SWITCHING REL

1) REL key is the relative value measurement communication

transmission key that acts with trigger. Press this key will enter into

the relative value measurement mode. The system will save the

display value in the memory as the reference value. When doing the

measurement later, the display value will be the difference value

that the entry value deducts the reference value.

2) Press REL

△

key will enter into the Manual Measurement Mode

automatically.

3) In REL

△

measurement status, press the key again, the REL

△

function will be relocked.

4) Press the key in HOLD status, HOLD function will be cancelled.

The system will save the display value in the memory as the

reference value. When doing the measurement later, the display

value is the difference that the entry value deducts the reference

value.

5) Press SELECT Key or use Mode Switch will cancel REL∆

- 16 –

measurement mode, and go back to the normal mode (REL∆will

disappear in the LCD).

6) OL triggering: Under REL

△

mode, OL shows when input value

larger than the allowed value of the measurement mode. Press the

key again, the relative measurement function will be cancelled.

Disable to enter REL

△

mode when OL shows.

7) No analog section bar function under REL

△

mode.

4.3 SWITCHING FREQUENCY OR DUTY

4.3.1 During working at the voltage or current ranges, press the

“Hz/%” button one time, frequency of the voltage or current

will be measured. Press the “Hz/%” button twice, the meter

will be changed into the duty range for measuring the duty

cycle of the voltage or current. At the same time, the meter is

changed into manual mode.

4.3.2 Press the "Hz/%" button again, meter will be back to the

condition of the voltage or current measuring.

NOTE:

During working at maximum or minimum value measuring

function, the meter can’t be changed into frequency or duty cycle

measuring mode.

4.4 SWITCHING MAXIMUM OR MINIMUM VALUE

4.4.1 At all ranges, press the "MAX/MIN" button one time, the

meter can be set to maximum value measuring mode; press

the button twice, the meter can be set to minimum value

measuring mode; press the button three times, the meter will

get back to normal test mode, and the maximum and

- 17 –

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