Mastech MS8228 Manual de usuario

DIGITAL

DIGITAL MULTIMETER

MULTIMETER

OPERAT

OPERAT ION

ION

ION MANUAL

MANUAL

DIGITAL MULTIMETER

CONTENTS

1. SAFETY INFORMATION … 1

1.1 PR ELIMINARY … 1

1.2 DOS AND DON ’ TS … 2

1.3 SYMBOLS … 3

1.4 MAINTENANCE … 4

2. DESCRIPTION

DESCRIPTION

DESCRIPTION … 6

2.1 NAMES OF PARTS … 7

2.2 SWITCH, BUTTONS AND INPUT JACKS … 8

2.3 LIQUID-CRYSTAL

LIQUID-CRYSTAL

LIQUID-CRYSTAL DISPLAY

DISPLAY

DISPLAY (LCD)

(LCD)

(LCD) … 10

3. SPECIFICATIONS

SPECIFICATIONS

SPECIFICATIONS … 12

3.1 GENERAL SPECIFICATIONS … 12

3.2 TECHNICAL SPECIFICATIONS … 13

4. OPERAT

OPERAT

OPERAT ION

ION

ION INSTRUCTION

INSTRUCTION

INSTRUCTION … 23

4.1 MISCONNECTION ALARM … 23

4.2 HOLD ING READINGS … 24

4.3 SWITCHING FUNCTION S … 24

4.4 SWITCHING RANGE S … 24

4.5 SWITCHING BETWEEN FREQUENCY / DUTY … 25

4.6 SWITCHING TO RELATIVE MEASUR EMENT … 25

4.7 BACK LIGHT … 26

4.8 LASER BEAM … 27

4.9 AUTO POWER OFF … 28

DIGITAL MULTIMETER

CONTENTS

4.10 PREPAR ING FOR MEASUREMENT … 29

4.11 MEASURING RELATIVE HUMIDITY … 29

4.12

MEASURING TEMPERATURE

(WITH THERMO-RESISTOR)

… 30

4.1 3 MEASURING DC VOLTAGE … 31

4.1 4 MEASURING AC VOLTAGE … 32

4.1 5 MEASURING DC MILLIVOLTAGE … 33

4.1 6 MEASURING AC MILLIVOLTAGE … 34

4.1 7 MEASURING DC CURRENT … 35

4.1 8 MEASURING AC CURRENT … 37

4.1 9 MEASURING FREQUENCY … 38

4. 20 MEASURING DUTY … 38

4. 21 MEASURING RESISTANCE … 39

4.2 2 MEASURING CAPACITANCE … 40

4.2 3 TESTING DIODE … 40

4.2 4 TESTING CONTINUITY … 41

4.25 TESTING TRANSISTOR … 42

4.26 MEASURING TEMPERATURE

(WITH INFRARED THERMO-SENSOR)

… 44

5. MAINTENANCE … 46

5.1 REPLACING THE BATTER IES … 46

5.2 REPLACING FUSE … 46

5.3 REPLACING TEST LEADS … 48

6. ACCESSORIES

ACCESSORIES

ACCESSORIES … 49

DIGITAL MULTIMETER

SAFETY INFORMATION NTS

1. SAFETY

SAFETY

SAFETY INFORMATION

INFORMATION

WARNING

BE EXTREMELY

EXTREMELY

EXTREMELY CAREFUL

CAREFUL

CAREFUL WHEN

WHEN

WHEN US

US ING

ING

ING THIS

THIS

THIS METER.

METER.

Improper

Improper use

use

use of

of this

this

this device

device

device can

can

can result

result

result in

in electric

electric

electric shock

shock

or destr

destr

destr uction

uction

uction of

of the

the

the meter.

meter.

meter. Take

Take

Take all

all

all normal

normal

normal safety

safety

precautions

precautions and

and

and follow

follow the

the

the safeguards

safeguards

safeguards suggested

suggested

suggested in

this

this manual.

manual.

To exploit

exploit

exploit full

full

full functionality

functionality

functionality of

of the

the

the meter

meter

meter and

and

and ensure

ensure

safe

safe operation,

operation,

operation, please

please

please read

read

read carefully

carefully

carefully and

and

and follow

follow the

the

directions

directions in

in this

this

this manual

manual

manual .

This meter complies with the general technical requirements

for the GB/T 19978-92 multimeter as well as the safety

requirements for GB4793.1-1995 ( IEC-1010 -1:1990)

concerning electronic measuring instruments , with pollution

degree 2 and overvoltage at CAT Ι Ι 10 00V/ CAT Ι Ι Ι 600V.

Follow all safety and operati on instructions to ensure safe

use of the meter.

With proper use and care, th is digital multimeter will give you

years of satisfactory service.

1.1

1.1 PRELIMINARY

PRELIMINARY

1.1.1 When using the meter, the user must observe all

normal safety rules concerning:

1) general p rotection against electric shock

2) p rotection of the meter against misuse

- 1 -

DIGITAL MULTIMETER

SAFETY INFORMATION NTS

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 have been incurred.

1.1.4

Test

leads must be kept in good condition. 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

1.2 DOS

DOS

DOS AND

AND

AND DON

DON

DON ’

’

’ TS

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 D o not touch the metal tips of the test leads w hen the

meter is connecte d to the circuit to be measured .

1.2.4 K eep your fingers behind the probe barriers wh en

taking a measurement with an effective voltage above

60V DC or 30V rms AC.

1.2.5 Do not take voltage measure ment if the value between

the terminals and earth ground exceeds 1000V.

1.2.6 S elect the highest range if the value scale to be

measured in the manual range is unknown.

- 2 -

DIGITAL MULTIMETER

SAFETY INFORMATION NTS

1.2.7 Do not connect the meter to any voltage source while

the rotary selector is in the current, resistance,

capacitance, diode, continuity range.

1.2.8 D isconnect the test leads from the circuit under test

b efore turning the rotary selector to change functions.

1.2.9 Be careful that high voltage pulses at test points may

damage the meter w hen measurements are being

taken on the circuit of TV switch power.

1.2.10 Do not measure the resistance ，capacitance, diode or

continuity of live circuits.

1.2.11 Do not take capacitance measurements un til the

capacitor to be measured has been fully discharged.

1.2.12 Do not use the meter near explosive gases , steam or

dirt.

1.2.13 Stop using the meter i f any abnormalities or faults are

observed.

1.2.14 Do not use the meter unless its rear case is securely

fastened in its original position .

1.2.15 D o not store or use the meter in areas exposed to

direct sunlight , at high temperature or with high relative

humidity.

1.3

1.3 SYMBOLS

SYMBOLS

- i mportant safety information ; refer to the operati on

manual.

- d angerous voltage may be presen t .

- 3 -

DIGITAL MULTIMETER

SAFETY INFORMATION NTS

- d ouble insulation （Protection class Ι Ι ）.

CAT II - o vervoltage ( i nstallation) c ategory II, p ollution

d egree 2 per IEC1010-1 , refer ring to the level of

i mpulse w ithstand v oltage protection provided.

CAT III - o vervoltage ( i nstallation) c ategory III, p ollution

d egree 2 per IEC1010-1 , refer ring to the level of

i mpulse w ithstand v oltage protection provided.

- c onforms to European Union Directive

- e arth ground

- fuse

- b attery l ow

1.4

1.4 MAINTENANCE

MAINTENANCE

1.4.1 D o not attempt to remov e 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 D isconnect the test leads from all sources of electric

current b efore opening the battery

battery

battery cover

cover

cover of the mete .

1.4.3

o avoid any electric shock caused by error readings,

replace the batteries immediately when the “ ” sign

appears on the display .

1.4.4

avoid fire hazards , the replace ment fuse must meet

the specified voltage and current at F 10A/250V (quick

acting ) .

- 4 -

DIGITAL MULTIMETER

SAFETY INFORMATION NTS

1.4.5 Use damp cloth and mild detergent to clean the meter;

do not use abrasives or solvents.

1.4.6 Turn the rotary selector to OFF position to switch off

the power when the meter is not in use.

1.4. 7 Remove the batteries to avoid damages to the meter i f

it will idle for a long time.

- 5 -

DIGITAL MULTIMETER

DESCRIPTION NTS

2. DESCRIPTION

DESCRIPTION

- This meter is a portable professional measuring

instrument with large LCD to show three lines of

readings, as well as back light for 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 i nstrument with scores of

practical applications for professional, workshop,

school, hobby and home use.

- The meter is devised with light and sound alarm to

prevent misconnection of test leads and provide

additional protection against damages caused by

improper operation.

- The h umidity and t emperature functions are suitable for

measur ing ambient humidity and temperature, as well

as temperature of objects .

- The digital m ultimeter can perform measurements of

AC/DC v oltage and c urrent, r esistance ，f requency, d uty,

c apacitance , a s well as c ontinuity and d iode test.

- The non-contact infrared temperature measurement

function makes it more convenient and safe to

measure temperatures.

- Both the reading and unit of measurement are displayed

on the LCD.

- Both a uto range and manual range are available

- 6 -

DIGITAL MULTIMETER

DESCRIPTION NTS

- This meter is equipped with auto power off function .

- This meter is equipped with reading h o ld function .

- This meter is equipped with relative meas urement

function .

2.1

2.1 NAMES

NAMES

NAMES OF

OF PART

PART

PART S

uA/mA

10A

1000V

COM

CAT III

1 ) LCD (Liquid-crystal

(Liquid-crystal

(Liquid-crystal display)

display)

2 ) Auto/ m anual switch b utton (RANGE)

3 ) Relative m easur ement switch b utton (REL)

4 ) Reading h old/ b ack l ight b utton (HOLD/B.L . )

5 ) Hz/ d uty switch b utton (Hz/DUTY)

- 7 -

DIGITAL MULTIMETER

DESCRIPTION NTS

6 ) Panel

7 ) Rotary selector

8 ) 10A i nput j ack

9 ) mA/ μ A/hFE i nput j ack

10 ) COM i nput j ack

) V 、Ω、Hz 、、 input jack

12) OFF - switch of power

1 3) Function switch b utton (SELECT)

1 4) ℃/℉switch b utton ( ℃/℉)

1 5) Humidity & Temperature s ensor

1 6) Infrared THERMO-Sensor

1 7) Laser Pointer

2.2

2.2 SWITCH,

SWITCH,

SWITCH, BUTTONS

BUTTONS

BUTTONS AND

AND

AND INPUT

INPUT

INPUT JACK

JACK

JACK S

HOLD/B.L . Button

- for holding the reading or control backlight

SELECT Button

- for switching among measuring function s

RANGE Button

- for switching between a uto and m anual r ange s .

Hz/D UTY Button

- for switching between Hz and d uty measur ement .

REL Button

- for switching to re lative measur ement .

- 8 -

DIGITAL MULTIMETER

DESCRIPTION NTS

℃/℉Button ( ℃/℉)

- for switching between ℃and ℉

Rotary Selector

- for select ing functions and ranges.

OFF Position

- for turn ing off the power.

10A I nput J ack

- for measuring current 0 ~ 10A.

mA/ μ A/hFE Input Jack

- for measuring current 0 ~ 400mA and hFE

V、Ω、Hz 、、 Input Jack

- for measuring voltage, resistance, frequency, duty,

capacitance, diode, and continuity.

COM Input Jack

- c ommon input connection for current, voltage,

resistance, frequency, duty, capacitance, diode, continuity,

hFE measurement.

Humidity Sensor

- for measur ing humidity.

Infrared THERMO-Sensor

- for infrared temperature measu ring

Laser Pointer

- for take aim object ( infrared temperature measu ring)

- 9 -

DIGITAL MULTIMETER

DESCRIPTION NTS

2.3

2.3 LIQUID-CRYSTAL

LIQUID-CRYSTAL

LIQUID-CRYSTAL DISPLAY

DISPLAY

DISPLAY (LCD)

(LCD)

1) Temperature indicator

2) Humidity indicator

3) Main indicator

~ AC

AC AC

AC (a lternating current )

DC DC

DC (direct current )

AC or DC (alternating current or direct current)

Diode

Continuity buzzer

HReading being held

hFE

hFE Transistor

- 10 -

DIGITAL MULTIMETER

DESCRIPTION NTS

REL

REL Relative m easure ment

AUTO

AUTO Auto range

B attery low

℃Celsius units (Temperature)

℉Fahrenheir units (Temperature)

%RH

%RH Relative Humidity units

FFarad (Capacitance)

ΩOhms (Resistance)

VVolts (Voltage)

AAmperes (Current)

Hz Hertz (Frequency)

%Duty Cycle

Laser Pointer

IR-T

IR-T I nfrared

emperature

ε =

= 0.95

0.95

0.95 E missivity

n、μ

μ、m

m、k

k、M

MUnit of measure prefixes: nano, micro,

milli, kilo and mega

DIGITAL MULTIMETER

SPECIFICATION NTS

3. SPECIFICATIONS

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

3.1 GENERAL

GENERAL

GENERAL SPECIFICATIONS

SPECIFICATIONS

3.1.1 The meter is devised with light and sound alarm to

prevent test leads misconnection.

3.1.2 Auto range and manual range options are available .

3.1.3 Overrange protection is provided for all ranges.

3.1.4 Max imum v oltage b etween t erminals a nd e arth

g round: 10 00V DC or rms AC

3.1.5 Operating a ltitude: max. 2000 meters (7000 ft.)

3.1.6 Display: LCD , 3 readings at the same time

3.1.7 Max imum v alue display : 3999 digits

3.1.8 Polarity i ndication: automatic; ‘ - ‘ for negative polarity.

3.1.9 Overrange i ndication: ‘ 0L

’

or ‘ -0L ’

3.1.10 Sampling t ime: approx. 0.4 second per sample

3.1.11 Unit indication : function and unit .

3.1.12 Auto power off time: 30 min.

3.1.13 Specification of resettable fuse: F1 500mA/250V

3.1.14 Fuse p rotection: F 2 10A/250V ( quick acting ).

3.1.15 Operating p ower : 1.5V × 3 AAA batter ies

3.1.16 Battery l ow i ndication: ‘

’

on LCD

3.1.17 Temperature f actor: < 0.1 × Accuracy / ℃

- 12 -

DIGITAL MULTIMETER

SPECIFICATION NTS

3.1.18 Operating t emperature: 0 ℃to 40 ℃ （ 32 °F to 104 °F）

3.1.19 Storage t emperature: -10 ℃to 50 ℃ （ 10 °F to 122 °F）

3.1.20 Dimension: 195 × 92 × 55mm

3.1.21 Weight: approximate 400g （including batter ies ）

3.2

3.2 TECHNICAL

TECHNICAL

TECHNICAL SPECIFICATIONS

SPECIFICATIONS

Ambient t emperature: 23 ±5℃Relative h umidity: < 75%

3.2.1 DC Voltage

Range Resolution Accuracy

40mV 0.01mV

400mV 0.1mV

±(0.7% of r ea d ing + 2 digits)

4V 1mV

40V 10mV

400V 100mV

1000V 1V

- Input Impedance: 10M Ω

- Overload p rotection:

40mV~ 400mV range: 250V DC or rms AC,

4V-1000V ranges: 1000V DC or 750V rms AC.

- Max. i nput v oltage: 1000V DC or 750V rms AC

NOTE:

At small voltage range, unsteady reading s will appear before

the test leads conta c t the circuit . This is normal because

the meter is highly sensiti ve . When the test leads contact

- 13 -

DIGITAL MULTIMETER

SPECIFICATION NTS

the circuit, the true reading will be shown .

3.2.2 AC Voltage

Range Resolution Accuracy

40mV 0.01mV

400mV 0.1mV

4V 1mV ±(0.8% of r ea d in g + 3 digits)

40V 10mV

400V 100mV

750V 1V ±(1.0% of r ea d in g + 3 digits)

- Input Impedance: 10M Ω

- Overload p rotection:

40mV~ 400mV range: 250V DC or rms AC,

4V-750V ranges: 1000V DC or rms 750V AC.

- Max. i nput v oltage: 1000V DC or rms 750V AC

- Frequency r ange: 40 to 400Hz

- Response: a verage, calibrated in rms of sine wave

NOTE:

At small voltage range, unsteady reading s will appear before

the test leads conta c t the circuit . This is normal because

the meter is highly sensiti ve . When the test leads contact

the circuit, the true reading will be shown .

- 14 -

DIGITAL MULTIMETER

SPECIFICATION NTS

3.2.3 DC Current

Range Resolution Accuracy

400 µA 0.1 µA

4000 µA 1 µA

40mA 10 µA±（1.2% of reading + 3 digits ）

400mA 100 µA

4A 1mA

10A 10mA ±（2.0% of reading + 10digits ）

- Overload protection:

µA、mA ranges: resettable fuses F1 500mA/250V

10A range: F2 10A/250V fuse (quick acting).

- Max. input current:

mA jack （µA ranges ）: 4mA,

mA jack （mA ranges ）: 400mA,

10A jack: 10A

- voltage drop ：

400 µA ranges: 40mV,

4000 µA ranges: 400mV,

40mA ranges: 40mV,

400mA ranges: 400mV,

4A range: 40mV

10A range: 100mV

- 15 -

DIGITAL MULTIMETER

SPECIFICATION NTS

3.2.4 AC Current

Range Resolution Accuracy

400 µA 0.1 µA

4000 µA 1 µA

40mA 10 µA±（1.5% of reading + 5 digits ）

400mA 100 µA

4A 1mA

10A 10mA ±（3.0% of reading + 10 digits ）

- Overload protection:

µA、mA ranges: resettable fuses F1 500mA/250V

10A range: F2 10A/250V fuse (quick acting),.

- Max. i nput c urrent:

mA j ack （µ

ranges ）: 4mA,

mA j ack （mA ranges ）: 400mA,

10A j ack: 10A

- voltage drop ：

400 µ

ranges: 40mV,

4000 µA ranges: 400mV,

40mA ranges: 40mV,

400mA ranges: 400mV,

4A range: 40mV

10A range: 100mV

- Frequency r ange: 40 to 400Hz

- Response: a verage, calibrated in rms of sine wave

- 16 -

DIGITAL MULTIMETER

SPECIFICATION NTS

3.2. 5 Resistance

Range Resolution Accuracy

400 Ω0.1 Ω

±(1.2% of r ea d ing + 2 digits)

4k Ω1Ω

40k Ω10 Ω

400k( 100 Ω

4M( 1k Ω

40M( 10k Ω ± (2.0% of reading + 5 digits)

- Open circuit voltage: ~0.25V

- Overload protection: 250V DC or rms AC

3.2.6 Capacitance

Range Resolution Accuracy

40nF 10pF

400nF 0.1nF

4µF 1nF ±（3.0% of r ea d ing + 3 digits ）

40 µF 10nF

1 00 µF 100nF

- Overload p rotection: 250V DC or rms AC

- 17 -

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