Mastech MS8201H Operator's Manual

DIGITAL MULTIMETER

OPERATOR’S MANUAL

CONTENTS

1. SAFETY INFORMATION ……1

1.1 PRELIMINARY ……1

1.2 DURING USE ……2

1.3 SYMBOLS ……5

1.4 MAINTENANCE ……6

2. DESCRIPTION ……8

2.1 NAMES OF COMPONENTS ……8

2.2

SWITCH AND BUTTONS
ELUCIDATE

……10

3. SPECIFICAT IONS ……11

3.1 GENERAL SPECIFICATIONS ……11

3.2

ELECTRICAL
SPECIFICATIONS

……12

4. OPERAT ING INSTRUCTION ……20

4.1 READ HOLD ……20

4.2 BACK LIGHT ……20

4.3 DC/AC TRANSFORM ……21

4.4 L/C TRANSFORM ……21

4.5

PREPARATION FOR
MEASUREMENT

……22

4.6 MEASURING DC VOLTAGE ……23

4.7 MEASURING AC VOLTAGE ……25

4.8 MEASURING DC CURRENT ……26

4.9 MEASURING AC CURRENT ……29

4.10 MEASURING RESISTANCE ……31

4.11 MEASURING CAPACITANCE ……33

4.12 MEASURING INDUCTANCE ……35

4.13

MEASURING
TEMPERATURE

……37

4.14 MEASURING FREQUENCY ……39

4.15 DIODE TESTING ……40

4.16 CONTINUITY TESTING ……42

4.17 TRANSISTOR TESTING ……44

4.18 TTL LOGIC TESTING ……46

5.

MAINTENANCE

……49

5.1 BATTERY REPLACEMENT ……49

5.2 FUSE REPLACEMENT ……51

5.3

TEST LEADS
REPLACEMENT

……52

6. ACCESSORIES ……53

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-1010 concerning
electronic measuring instruments with
an overvoltage category (CAT ΙΙ) 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, your 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:

• Protection against the dangers of
electrical current.

Digital Multimeter 1

• 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 Measuring 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.

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

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each range of measurement.

1.2.3 When the meter is linked to a
measurement circuit, do not touch
unused terminals.

1.2.4 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
1000V 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
function switch is in the current,
resistance, capacitance, inductance,
temperature, frequency, diode,
transistor or continuity mode. Doing
so can damage the meter.

1.2.8 Before rotating the range switch
to change functions and ranges,
disconnect test leads from the

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circuit under test.

1.2.9 When carrying out measurements
on TV or switching power circuits
always remember that there may be
high amplitude voltages pulses at
test points, which can damage the
meter.

1.2.10 Never perform resistance,
capacitance, inductance, diode and
continuity measurements on live
circuits.

1.2.11 Never perform capacitance
measurements unless the capacitor
to be measured has been
discharged fully.

1.2.12 Never use the meter under the
condition of the explosive air, steam
or dirt.

1.2.13 If any faults or abnormalities are
observed, the meter can not be
used any more and it has to be
checked out.

1.2.14 Never use the meter unless the
rear case is in place and fastened
fully.

4 Digital Multimeter

1.2.15 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）.

CAD II Overvoltage (Installation)

category II, Pollution Degree 2
per IEC1010-1 refers to the
level of Impulse Withstand
Voltage protection provided.

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

Power ON/OFF

Fuse

Low Battery

Digital Multimeter 5

~ AC (alternating current)

DC (direct current)

Continuity Buzzer

~ AC or DC (alternating current or

direct current)

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 250mA

/250V (quick acting,

≤1

6 Digital Multimeter

resistance

Ω

), F 12.5A / 250V

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.

Digital Multimeter 7

(quick acting).

2. DESCRIPTION

- This meter is a portable professional
measuring instrument with large
LCD and back light easily reading.

- Single operation of a range 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 data hold.

- When using, it can show ranges
engineering unit enunciators
measuring results.

2.1 NAMES OF COMPONENTS

① LCD Display
② L/C Button
③ Power Button (

)

④ Range Switch

⑤

⑥ Battery cover
⑦ 10A Jack

8 Digital Multimeter

Top shell

⑧

COM jack

⑨

DC/AC Button（DC/AC）

⑩

Back Light Button (LIGHT)
Data Button(HOLD)

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, Ω, ℃, A, V, Hz, H Jack

11

12

2.2 SWITCH AND BUTTONS
ELUCIDATION

• Range Switch

This switch is used to select functions
and desired ranges.

• Power Button (

)

This Button is used to the switch of
power.

• L/C Button（L/C）

This Button is used to the capacitance
and inductance measurements. In this
range, press the button to begin the
measurement. The other ranges will
be loosened.

• Data Button (HOLD)

This Button is used to the switch of
data hold

• DC/AC Button（DC/AC）

This Button is used to the AC voltage
and AC current measurements. Once
press the button to the alternative
state, then the measurement begins.
The other ranges will be loosened.

• Back Light Button (LIGHT)

This Button is used to the switch of
back light.

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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

3.1.1Measuring method: Dual-slope
integration A/D converter

3.1.2 Sampling Time: approx. 0.4
second

3.1.3 Display: 25mm LCD

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

3.1.5 Polarity Indication: ‘-’indicates
negative polarity.

3.1.6 Overrange Indication: Display ‘1’

3.1.7 Unit showing: showing of
electrical capacity.

3.1.8 Low Battery Indication: ‘

’

displayed

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

3.1.10 Max. Voltage Between Terminals

And Earth Ground: 1000V DC or 700

3.1.11 Fuse Protection: F 250mA/250V

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AC rms.

(quick acting, resistance ≤1Ω), F

12.5A/250V (quick acting).

3.1.12 Power Supply: 9V battery, NEDA
1604 or 6F22

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

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

3.1.15 Dimension: 185×84×38 mm

3.1.16 Weight: approx. 300g（including
battery）

3.2 ELECTRICAL SPECIFICATIONS

Circumstance Temperature: 23±5 ℃
Relative Humidity: < 75%

3.2.1 DC Voltage

Range Resolution Accuracy

200mV 0.1mV ±（0.5% of rdg + 1 digit）

2V 1mV ±（0.5% of rdg + 3 digits）

20V 10mV ±（0.5% of rdg + 3 digits）

200V 100mV ±（0.5% of rdg + 3 digits）

1000V 1V ±（0.8% of rdg + 3 digits）

- Input Impedance: 10MΩ

- Overload Protection: 200mV range:

12 Digital Multimeter

250V DC or rms AC, 2V-1000V
ranges: 1000V DC or 700V rms AC.

- Max. Input Voltage: 1000V DC

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.

3.2.2 AC Voltage

Range Resolution Accuracy

200mV 0.1mV ±（1.2% of rdg + 5 digits）

2V 1mV ±（1.0% of rdg + 5 digits）

20V 10mV ±（1.0% of rdg + 5 digits）
200V 100mV ±（1.0% of rdg + 5 digits）
700V 1V ±（1.2% of rdg + 3 digits）

- Input Impedance: 10MΩ

- Overload Protection: 200mV range:
250V DC or rms AC, 2V-700V ranges:
1000V DC or 700V rms AC.

- Frequency Range: 40 to 400Hz

- Response: Average, calibrated in

Digital Multimeter 13

rms of sine wave.

- Max. Input Voltage: 700V rms AC

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.

3.2.3 DC Current

Range Resolution Accuracy

2mA 1μA ±（1.0% of rdg + 3 digits）

20mA 10μA ±（1.0% of rdg + 3 digits）

200mA 100μA ±（1.5% of rdg + 5 digits）

10A 10mA ±（2.0% of rdg + 10 digits）

- Overload Protection: 2 to 200mA
ranges: F1: F 250mA/250V fuse
(quick acting, resistance ≤1Ω), 10A
range: F2: F 12.5A/250V fuse (quick
acting).

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

- Voltage Drop: 200mV

14 Digital Multimeter