Mastech MS8221C Manuel utilisateur

MS8221C

DIGITAL MULTIMETER

USER'S MANUAL 1. Safety Information

1.1 Preliminary

CONTENTS

2.1

2.2 Switch, Buttons and Input Jack

Elucidation

Description

Names of Components

3.1

3.2

General speciﬁcations

Electrical speciﬁcations

4.2

Operating Instruction

Data Hold

4.3 Maximum Hold

4.4 Function Transform

4.5 Range Transform

4.6 Back Light

1.2 During use

1.3 Symbols

1.4 Maintenance

3. Speciﬁcations

4.1 Power -up

CONTENTS

5.1

5.2

Maintenance

Battery Replacement

Fuse Replacement

5.3 Test Leads Replacement

4.7 Auto Power Off

4.8 Preparation for Measurement

4.9 DC Voltage Measuring

4.10 AC Voltage Measuring

4.11 DC Current Measuring

4.12

4.13

4.15

AC Current Measuring

DC Current Measuring

(with clamp, optional)

Resistance Measuring

4.17 Capacitance Measuring

4.18 Diode Testing

4.19 Continuity Testing

4.16 Temperature Measuring

4.20 Transistor Testing

6. Accessories

4.14 AC Current Measuring

(with clamp, optional)

1.Safety Information

This multimeter has been designed according to

EN-61010 concerning electronic measuring instruments

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

With proper use and care, the digital multimeter will

give you 1 years of satisfactory service.

Follow all safety and operating instructions to ensure

that the meter is used safely and is kept in good

operating condition.

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.

WARNING

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 or same electric ratings.

•

02 03

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, temperature, battery, 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, 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.

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.

1.3 Symbols

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.

Note-Important safety information, refer to the

instruction manual.

Earth (ground) TERMINAL

Caution, possibility of electric shock

Equipment protected throughout by double

insulation or reinforced insulation.

Direct current

Alternating current

CAT III: MEASUREMENT CATEGORY III is applicable to

test and measuring circuits connected to the distribution

part of the building's low-voltage MAINS installation.

Fuse must be replaced as per the specification herein.

04 05

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.

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.

2.1 Names of Components

- 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.

(1) LCD Display

(2) ON/OFF Button

(3) RANGE Button

(4) FUNC. Button

(5) Transform Switch

(6) 10A Jack

(7) INPUT Jack

(8) COM Jack

(9) Panel

(10) Button

(11) DATA-H Button

(12) MAX. H Button

(1)

(2)

(3)

(4)

(5)

(6) (7)

(8)

(9)

(10)

(11)

(12)

06 07

• 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

3. Speciﬁcations

Accuracy is speciﬁed for a period of year after

calibration and at 18˚C to 28˚C(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

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.

3.1.14 Operating Temperature: 0˚C to 40˚C

(32˚F to 104˚F)

3.1.15 Storage Temperature: -10˚C to 50˚C

(10˚F to 122˚F)

3.1.16 Dimension: 158×74×32 mm

3.1.17 Weight: approx. 250g (including battery)

3.2 Electrical Speciﬁcations

Circumstance Temperature: 23±5˚C

Relative Humidity: < 75%

3.2.1 DC Voltage

Range Resolution Accuracy

200mV

20V

200V

600V

0.1mV

0.001V

0.01V

0.1V

±(0.7% of rdg + 2 digits)

- Input Impedance: 10MΩ

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 batteries.

08 09

- Overload Protection: 200mV range: 250V DC or AC

rms, 2V-600V ranges: 600V DC or AC rms.

- Max. Input Voltage: 600V DC

3.2.2 AC Voltage

Range Resolution Accuracy

200mV

20V

200V

600V

0.1mV

0.001V

0.01V

0.1V

±(0.8% of rdg + 3 digits)

±(1.0% of rdg + 3 digits)

- Input Impedance: 10MΩ

- Overload Protection: 200mV range: 250V DC or AC

rms, 2V-600V ranges: 600V DC or AC rms.

- Frequency Range: 40 to 400Hz

- Response: Average, calibrated in rms of sine wave.

- Max. Input Voltage: 600V AC rms

3.2.3 DC Current

Range Resolution Accuracy

200μA

2000μA

20.00mA

2.000A

0.1μA

1μA

0.01mA

0.1mA

0.001A

±(1.2% of rdg + 3 digits)

200.0mA

10.00A 0.01A ±(2.0% of rdg + 10 digits)

- Overload Protection: µA, mA ranges: F 200mA/250V

fuse (quick acting), 2A, 10A range: unfused.

- Max. Input Current: INPUT Jack: 200mA,

10A Jack: 10A

- Overload Protection: µA, mA ranges: F 200mA/250V

fuse (quick acting), 2A, 10A range: unfused.

- Max. Input Current: INPUT Jack: 200mA, 10A Jack:10A

- Frequency Range: 40 to 400Hz

- Response: Average, calibrated in rms of sine wave.

-Voltage Drop：200µA、20mA、2A: 20mV, 2000µA、

200mA、10A range: 200mV

3.2.5 DC Current (with clamp, optional)

Range Resolution Accuracy

0.1mV/0.1A ±(1.2 % of rdg

+3 digits)

meter 200A

0.1A /0.1mV Typical

±(2.0 %)

±(1.2 % of rdg

±3 digits)

Typical

±(2.0 %)

DC Clamp

meter

0 to 200A

2000A

0 to 2000A

1mV/1A

1A/1mV

- Overload Protection: 250V DC or AC rms

- Max. Input Voltage: 200mV

- Voltage Drop：200µA、20mA、2A: 20mV, 2000µA、

200mA、10A range: 200mV

3.2.4 AC Current

Range Resolution Accuracy

200μA

2000μA

20.00mA

2.000A

±(1.5% of rdg + 5 digits)

200.0mA

10.00A 0.01A ±(3.0% of rdg + 10 digits)

0.1μA

1μA

0.01mA

0.1mA

0.001A

10 11

- Overload Protection: 250V DC or AC rms

- Max. Input Voltage: 200mV

- Frequency Range: 40 to 400Hz

- Response: Average, calibrated in rms of sine wave.

3.2.6 AC Current (with clamp, optional)

Range Resolution Accuracy

0.1mV/0.1A ±(1.5 % of rdg

+5 digits)

meter 200A

0.1A /0.1mV Typical

±(3.0 %)

±(1.5 % of rdg

±3 digits)

Typical

±(3.0 %)

AC Clamp

meter

0 to 200A

2000A

0 to 2000A

1mV/1A

1A/1mV

3.2.7 Resistance

Range Resolution Accuracy

±(1.0% of rdg + 3 digits)

±(1.0% of rdg + 1 digit1)

±(1.0% of rdg + 5 digits)

200Ω

2kΩ

20kΩ

200kΩ

2MΩ

20MΩ

0.1Ω

0.001kΩ

0.01kΩ

0.1kΩ

0.001MΩ

0.01MΩ

- Open Circuit Voltage: 0.25V

- Overload Protection: 250V DC or AC rms

- Overload Protection:

20nF~20μF Ranges: F 200mA/250V fuse (quick acting),.

200μF/1000μF Ranges: No Overload Protection.

3.2.9 Capacitance

Range Resolution Function

0.01nF

0.1nF

0.001μF

20nF

200nF

2μF

0.01μF

0.1μF

1μF

20μF

200μF

1000μF

±(4.0% of rdg + 10digits)

±(4.0% of rdg + 3digits)

- Open circuit voltage: approx. 0.5V

- Overload Protection: 250V DC or AC rms

3.2.8 Temperature

Range -20 to 1000˚C ˚C

Resolution 1˚C

Accuracy

-20 to 0 ˚C ˚C

0 to 400˚C ˚C

400 to 1000˚C ˚C

±(5% of rdg + 4digits)

±(1% of rdg + 3digits)

±(2% of rdg + 3digits)

Range -0 ~1800˚F ˚F

Resolution 1˚F

Accuracy

-0 ~50˚F ˚F

50 ~750˚F ˚F

750 ~1800˚F ˚F

±(5% of rdg + 4digits)

±(1% of rdg + 3digits)

±(2% of rdg + 3digits)

- Overload Protection: 250V DC or AC rms

12 13

3.2.10 Diode

3.2.12 Transistor hFE

Range Resolution Function

Display :read approximate

forward voltage of diode

1mV

- Forward DC Current: approx. 1mA

- Reversed DC Voltage: approx.1.5V

- Overload Protection: 250V DC or AC rms

3.2.11 Continuity

Range Function

Built-in buzzer will sound, if resistance

is lower than 50Ω.

- Open circuit voltage: approx. 0.5V

- Overload Protection: 250V DC or AC rms

Range Function

Display: read approximate hFE value

(0-1000) of transistor under test (ALL TYPE)

- Base Current: approx. 2μA,

Vce: approx. 1V

-Overload Protection: F 200mA/250V fuse (quick acting)

4. Operating Instruction

4.1 Power-UP

Press the ‘ON/OFF’ button to turn the meter ON or OFF.

4.2 Data Hold

If you need data hold when measuring, you can put on

‘DATA-H’ button, it will hold the reading; if you put the

button again, data hold is not continue.

hFE

4.5 Range Transform

The auto range is used when measuring the current,

voltage, capacitance and resistance. Put down the ‘RANGE’

if the manual range is needed. Each time you put down,

range will go upward; the minimum range is transformed

if ‘RANGE’ is put down at the maximum range. If the

‘RANGE’ is put down more than two seconds, auto range

is used again.

4.6 Back Light

If the light is dark to make the reading difﬁcult when

measuring, you can press ‘ ’ button to turn on the back

light, which will last for 15 seconds. Continuous pressing

the button for two seconds will turn off the back light.

Note:

LED is the main source of back light. Its working current

is large, although the meter has the timer equipment

(time is 15 seconds and it will off automatically after 15

seconds); often use back light will shorten the battery

life, you'd better not to use the back light so frequently if

it's not necessary.

4.3 Maximum Value Hold

If you need data hold when measuring, you can put on

‘MAX.H’ button, it will hold the maximum value; if you

put the button again, maximum value hold is not continue.

4.4 Function Transform

Put down the ‘FUNC.’ when measuring the current and

voltage. Meter will be transformed between DC and AC

range. Put 'FUNC.' when measuring the temperature,

meter will transform between ˚Cand ˚F range. Put ‘FUNC.’

when measuring the diode and continuity, meter will

transform among them.

14 15

When the battery voltage is less than 4V, it will show ‘ ’.

But if you use back light at the same time, maybe ‘ ’

will come up even if the battery voltage is more than 4V,

because the working current is higher and the voltage

will decline. (When ‘ ’ shows, the accuracy of the

measurement can not be assured.) You need not replace

the battery. When you use normally (back light is not

using), ‘ ’ will not show up. You need replace it till ‘ ’

show again.

4.7AUTO Power Off

If there's no any operation within ﬁfteen minutes after

power is on, meter will auto power off with ﬁve short

sounds and a long sound in a minute.

After auto power off, if stir the transform switch or put

down any button of 'FUNC.', 'DATA-H', 'MAX.H', 'RANGE',

meter will recover the working condition.

If presses the ‘DATA-H’ when power is on, auto power

off disable.

4.8 Preparation For Measurement

4.8.1 Put on the ‘ON/OFF’ button. If the battery voltage

is less than 3.8V, display will show ‘ ’, the battery

should be changed at this time.

4.8.2 The ‘ ’besides the input jack shows that the input

voltage or current should be less than speciﬁcation

on the sticker of the meter to protect the inner

circuit from damaging.

4.8.3 Select a function and a range for the item to be

measured through rotating the transform switch

accordingly. When the value scale to be measured

is unknown beforehand, set the range selector at

the highest position.

4.9 Measuring DC Voltage

You can't input the voltage which more than 600V

DC, it's possible to show higher voltage, but it's

may destroy the inner circuit.

Pay attention not to get an electric shock when

measuring high voltage.

WARNING

4.9.1 Connect the black test lead to the COM jack and

the red test lead to the INPUT jack.

4.9.2 Set the transform switch at the V range position.

4.9.3 Put down the 'FUNC.' to enter the DC

measurement. Auto range or manual range can

be transformed by putting the 'RANGE'.

4.9.4 Connect test leads across the source or load

under measurement.

4.9.5 You can get a reading from LCD display.

The polarity of the red test lead connection will

be indicated.

Note:

• At the little voltage range, the meter will show

unsteady reading when test leads haven't reach the

circuit, it's normal because the meter is very

sensitivity. When test leads touch the circuit, you can

get the true reading.

• At the manual range mode, when only the ﬁgure 'OL'

is displayed, it indicates overrange situation and the

higher range has to be selected.

4.8.4 When connection, ﬁrst connect to the public testing

line, then to the electriferous testing line. When

you'll remove it, you should remove the

elecriferous one.

16 17

• At the manual range mode, when the value scale to

be measured is unknown beforehand, set the range

selector at the highest position.

4.10 Measuring AC Voltage

You can't input the voltage which more than 600V

rms AC, it's possible to show higher voltage, but

it's may destroy the inner circuit.

Pay attention not to get an electric shock when

measuring voltage.

WARNING

4.10.1 Connect the black test lead to the COM jack and

the red test lead to the INPUT jack.

4.10.2 Set the transform switch at the V range position.

4.10.3 Put down the 'FUNC.' to enter the AC

measurement. Auto range or manual range can

be transformed by putting the 'RANGE'.

4.10.4 Connect test leads across the source or load

under measurement.

4.10.5 You can get reading from LCD.

Note:

• At the little voltage range, the meter will show

unsteady reading when test leads haven't reach the

circuit, it's normal because the meter is very

sensitivity. When test leads touch the circuit, you can

get the true reading.

At the manual range mode, when only the ﬁgure 'OL'

is displayed, it indicates overrange situation and the

higher range has to be selected.

At the manual range mode, when the value scale to

be measured is unknown beforehand, set the range

selector at the highest position.

•

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