Mastech MS8221, MS8221A, MS8221D, MS8221B, MS8230B User Manual

CONTENTS

1. SAFETY INFORMATION…………………………….1

2. DESCRIPTION………………………………………..4

3. SPECIFICATIONS…………………………………….6

4. OPERATING INSTRUCTION………………………..9

4.1 Voltage measurement…………………….……..10

4.2 Current measurement……………………………10

4.3 Resistance measurement…………………….....12

4.4 Diode test………………………………………….12

4.5 Continuity test…………………………………….13

4.6 Temperature measurement……………………...13

4.7 Battery test………………………………………..14

4.8 Transistor measurement…………………………14

5. MAINTENANCE………………………….…………..15

User'sManual

Mastech MS8221

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 II 1000V, CAT III
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

- 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.

- When the meter is delivered, check that it has not
been damaged in transit.

- When poor condition under harsh preservation or
shipping conditions caused, inspect and confirm this
meter without delay.

- Test leads must be in good condition. Before using

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verify that the insulation on test leads is not
damaged and/or the leads wire is not exposed.

- 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

- Before using, you must select the right input jack,
function and range.

- Never exceed the protection limit values indicated in
specifications for each range of measurement.

- When the value scale to be measured is unknown
beforehand, set the range selector at the highest
position.

- Do not measure voltage if the voltage on the
terminals exceeds 1000V above earth ground.

- Always be careful when working with voltages above
60V DC or 30V AC rms, keep fingers behind the
probe barriers while measuring.

- Before rotating the transform switch to change
functions and ranges, disconnect test leads from the
circuit under test.

- Never perform resistance, temperature, transistor,

diode and continuity measurements on live circuits.

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

- If any faults or abnormalities are observed, the meter

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

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

- Please do not store or use meter in areas exposed to
direct sunlight, high temperature, humidity or
condensation.

1.3 SYMBOL

1.4 MAINTENANCE

- 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.

- Before opening the battery cover or case of the meter,
always disconnect test leads from all tested circuits.

- To avoid the wrong reading causing electricity attack,
when the meter displays“

”, you must change the

Caution: refer to the instruction manual.
Incorrect use may result in damage to the
device or its components.

Earth
This instrument has double insulation.
Fuse: F 200mA/250V

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battery.

- For continue protection against fire, replace fuse only
with the specified voltage and current ratings: F
200mA/250V (quick acting).

- Do not use abrasives or solvents on the meter, use a
damp cloth and mild detergent only.

- Always set the power switch to the OFF position when
the meter is not in use.

- 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 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 is with the functions of data hold.

NAME OF COMPONENTS

1. LCD display

2. Hold key

3. Rotary switch

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4. hFE socket (except MS8221D)

5. Terminals

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