Mastech MS8201H User 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. SPECIFICATIONS ……11
3.1 GENERAL SPECIFICATIONS ……11
3.2 ELECTRICAL
SPECIFICATIONS
……12
4. OPERATING 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
2 Digital Multimeter

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
Digital Multimeter 3

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).