Mastech MS8221C User manual

DIGITAL

MULTIMETER

INSTRUCTION MANUAL

DIGITAL MULTIMETER

CONTENTS

1. SAFETY INFORMATION ……1

1.1 PRELIMINARY ……1

1.2 DURING USE ……2

1.3 SYMBOLS ……3

1.4 MAINTENANCE ……4

2. DESCRIPTION ……5

2.1 NAMES OF COMPONENTS ……5

2.2 SWITCH, BUTTONS AND INPUT JACK

ELUCIDATION

……6

3. SPECIFICATIONS ……7

3.1 GENERAL SPECIFICATIONS ……7

3.2 ELECTRICAL SPECIFICATIONS ……8

4. OPERATING INSTRUCTION ……13

4.1 POWER-UP ……13

4.2 DATA HOLD ……13

4.3 MAXIMUM HOLD ……13

4.4 FUNCTION TRANSFORM ……13

4.5 RANGE TRANSFORM ……13

4.6 BACK LIGHT ……14

4.7 AUTO POWER OFF

……14

4.8

PREPARATION FOR MEASUREMENT

……15

4.9 MEASURING DC VOLTAGE ……15

4.10 MEASURING AC VOLTAGE ……17

4.11 MEASURING DC CURRENT ……18

4.12 DC CURRENT MEASURING (WITH

CLAMP, OPTIONAL)

……19

4.13 MEASURING AC CURRENT ……20

DIGITAL MULTIMETER

CONTENTS

4.14 AC CURRENT MEASURING (WITH

CLAMP, OPTIONAL)

……22

4.15 MEASURING RESISTANCE ……23

4.16 MEASURING TEMPERATURE ……24

4.17 MEASURING CAPACITANCE ……25

4.18 DIODE TESTING ……26

4.19 CONTINUITY TESTING ……27

4.20 TRANSISTOR TESTING ……28

5. MAINTENANCE ……29

5.1 BATTERY REPLACEMENT ……29

5.2 FUSE REPLACEMENT ……29

5.3 TEST LEADS REPLACEMENT ……30

6. ACCESSORIES ……31

DIGITAL MULTIMETER

SAFETY INFORMATION

1. SAFETY INFORMATION

WARNING

To ensure safe operation, and in order to exploit to the

full the functionality of the meter, please follow the

directions in this section carefully.

This multimeter has been designed according to

IEC-61010-1 concerning electronic measuring instruments

with an overvoltage category CAT ΙΙΙ 600V and pollution 2.

Follow all safety and operating instructions to ensure that the

meter is used safely and is kept in good operating condition.

With proper use and care, the digital meter 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:

•Protection against the dangers of electrical current.

•Protection of the meter against misuse.

1.1.2 When the meter is delivered, check that it has not been

damaged in transit.

1.1.3 When poor condition under harsh preservation or

shipping conditions caused, inspect and confirm this

meter without delay.

1.1.4 Test leads must be in good condition. Before using

verify that the insulation on test leads is not damaged

and/or the leads wire is not exposed.

1.1.5 Full compliance with safety standards can be

guaranteed only if used with test leads supplied. If

necessary, they must be replaced with the same model

- 1 -

DIGITAL MULTIMETER

SAFETY INFORMATION

or same electric ratings.

1.2 DURING USE

1.2.1 Before using, you must select the right input jack,

function and range.

1.2.2 Never exceed the protection limit values indicated in

specifications for each range of measurement.

1.2.3 When the meter is linked to a measurement circuit, do

not touch unused terminals.

1.2.4 At the manual range, when the value scale to be

measured is unknown beforehand, set the range

selector at the highest position.

1.2.5 Do not measure voltage if the voltage on the

terminals exceeds 600V above earth ground.

1.2.6 Always be careful when working with voltages above

60V DC or 30V AC rms, keep fingers behind the probe

barriers while measuring.

1.2.7 Never connect the meter leads across a voltage

source while the transform switch is in the current,

resistance, capacitance, temperature, diode, transistor

or continuity mode. Doing so can damage the meter.

1.2.8 Before rotating the transform switch to change

functions and ranges, disconnect test leads from the

circuit under test.

1.2.9 Never perform resistance, capacitance, temperature,

transistor, diode and continuity measurements on live

circuits.

1.2.10 Never use the meter under the condition of the

explosive air, steam or dirt.

- 2 -

DIGITAL MULTIMETER

SAFETY INFORMATION

1.2.11 If any faults or abnormalities are observed, the meter

can not be used any more and it has to be checked out.

1.2.12 Never use the meter unless the rear case is in place

and fastened fully.

1.2.13 Please do not store or use meter in areas exposed to

direct sunlight, high temperature, humidity or

condensation.

1.3 SYMBOLS

Important safety information, refer to the operating

manual.

Double insulation（Protection classΙΙ）.

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

Fuse

AC Alternating current

DC Direct current

Diode

Continuity buzzer

AC or DC (alternating current or direct current)

Measurement with clamp (optional), widening the field

of applications of the meter

℃Centigrade

℉Fahrenheit

MAX.H The maximum value is being held.

- 3 -

DIGITAL MULTIMETER

SAFETY INFORMATION

DATA-H This indicates that the display data is being held.

AUTO Auto range

The battery is not sufficient for proper operation.

1.4 MAINTENANCE

1.4.1 Please do not attempt to adjust or repair the meter by

removing the rear case while voltage is being applied.

A technician who fully understands danger involved

should only carry out such actions.

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

always disconnect test leads from all tested circuits.

1.4.3 To avoid the wrong reading causing electricity attack,

when the meter displays“”, you must change the

battery.

1.4.4 For continue protection against fire, replace fuse only

with the specified voltage and current ratings: F

200mA/250V (quick acting).

1.4.5 Do not use abrasives or solvents on the meter, use a

damp cloth and mild detergent only.

1.4.6 Always set the power switch to the OFF position when

the meter is not in use.

1.4.7 If the meter is to be stored for a long period of time, the

batteries should be removed to prevent damage to the

unit.

- 4 -

DIGITAL MULTIMETER

DESCRIPTION

2. DESCRIPTION

- This meter is a portable professional measuring

instrument with handsome LCD and back light easily

reading.

- Single operation of a transform switch makes

measurement convenient. Overload protection and low

battery indication are provided, this meter is ideal for use

in the fields, workshop, school, hobby and home

applications.

- This meter has function of auto range and manual range.

- This meter has function of auto power off.

- This meter is with the functions of data hold and maximum

value hold.

- When using, it can show ranges engineering unit

enunciators measuring results.

2.1 NAMES OF COMPONENTS

⑴ LCD Display

⑵ ON/OFF Button

⑶ RANGE Button

⑷ FUNC. Button

⑸ Transform Switch

⑹ 10A Jack

⑺ INPUT Jack

⑻ COM Jack

⑼ Panel

⑽ Button

⑾ DATA-H Button

⑿ MAX.H Button

- 5 -

(1)

(2)

(3)

(4)

(5)

(6)

(10)

(11)

(9)

(7)

(8)

(12)

DIGITAL MULTIMETER

DESCRIPTION

2.2 SWITCH, BUTTONS AND INPUT JACK ELUCIDATION

•ON/OFF Button

This Button is used to the switch of power.

•RANGE Button

This button is used to transform Auto range or manual

range.

•FUNC. Button

This button is used to transform function.

•DATA-H Button

This Button is used to the switch of data hold.

•MAX.H Button

This Button is used to the switch of maximum value hold.

•Button

This button is used to the switch of back light.

•Transform Switch

This switch is used to select functions and desired ranges.

•10A Jack

Input terminal for current 0 ~ 10A

•INPUT Jack

Input terminals except 10A

•COM Jack

Common terminal for measurement

- 6 -

DIGITAL MULTIMETER

SPECIFICATIONS

3. SPECIFICATIONS

Accuracy is specified for a period of year after calibration and

at 18℃to 28℃（64°F to 82°F）with relative humidity to 75%.

3.1 GENERAL SPECIFICATIONS

3.1.1 Auto ranges and manual range.

3.1.2 Max. Voltage Between Terminals And Earth Ground:

600V DC or AC

3.1.3 Fuse Protection: F 200mA/250V (quick acting).

3.1.4 Operating Altitude: 2000 meters (7000 ft.) maximum

3.1.5 Display: 16mm LCD

3.1.6 Max. Show Value: 1999 (3 1/2)

3.1.7 Polarity Indication: ‘-‘ indicates negative polarity.

3.1.8 Overrange Indication: Display ‘OL’

3.1.9 Sampling Time: approx. 0.4 second

3.1.10 Unit showing: showing of function and electrical

capacity.

3.1.11 Low Battery Indication: ‘ ’ displayed

3.1.12 Auto power off time: 15 min.

3.1.13 Power Supply: 1.5V×3 AAA battery.

3.1.14 Operating Temperature: 0℃to 40℃（32°F to 104°F）

3.1.15 Storage Temperature: -10℃to 50℃（10°F to 122°F）

3.1.16 Dimension: 158×74×32 mm

3.1.17 Weight: approx. 250g（including battery）

- 7 -

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