Mastech MS8321A, MS8321C User Manual

MS8 21A3

Digital Multimeter

CAT III

600V

CONTENTS

1.1.1 Precautions.................................1

1. ............................................1Introduction

1.1.2 Safety Symbols.............................2

1.1.3 Maintenance................................3

2.Instrument Description ...........................3

2.1 Front Panel.......................................3

2.2 Display............................................5

2.3 Buttons ...........................................5

3. Specifications.........................................6

3.1 General Specifications...........................6

2.4 Rotary Switch ....................................5

2.5 Input Jacks .......................................5

2.7 Accessories ......................................5

1.1 Safety Guidelines................................1

2.6 Automatic Power Off ............................5

3.2 Tech nic al Sp eci fic ati ons .........................6

3.2.4 AC Current ..................................8

3.2.5 Resistance..................................9

3.2.6 Continuity/Diode Test......................9

3.2.1 DC Voltage..................................7

3.2.2 AC Voltage ..................................7

3.2.3 DC Current .................................8

3.2.7 hFE Transistor Gain........................9

4. Operating Instructions......................10

4.1 DC/AC Voltage..................................10

4.2 Resistance ......................................1 0

4.3 DC/AC Current ..................................11

4.4 Diodes............................................11

4.5 hFE Transistor Gain.............................12

4.6 Continuity........................................12

5. Maintenance..........................................13

5.1 Cleaning the Meter..............................13

5.2 Replacing the Probe

Replacing the Battery and Fuses

............................13

..............145.3

1.1.2 Safety Symbols

01

02

1.Introduction

This digital multi meter
AC/DC current, resistance, diode. The meter complies
with international safety standards UL61010-1,

CAT III 600V and pollution degree of 2.
Read all instructions carefully before using the meter and
follow all relevant safety standards.

can measure AC/DC voltage,

CSA

C22.2 No.61010-1,

• Do not perform a voltage test using the 10A input jack.

• Always be careful when working with voltages above 60V dc
or 30V ac rms. Keep fingers behind the probe barriers when
making voltage measurements.

• When connecting the test leads to a measurement circuit,
connect the common lead first, then the live lead. Reverse
when disconnecting.

• Disconnect leads from circuit before switching functions/ranges.

• Disconnect leads from circuit before testing transistors.

• Turn off power to circuit and discharge all capacitors before
making resistance, continuity or diode measurements.

• Before making current measurements, turn off power to the
circuit, break the circuit, connect the leads in series across the
break, then turn the power back on for measurement.

• When the “ ”symbol appears, replace the batteries to avoid
incorrect readings.

1.1 Safety Guidelines

To ensure safe usage of this instrument, please read the following
carefully:

1.1.1 Precautions

•

• Inspect the case before use. Check for cracks in the casing
and the insulation around the input sockets.

• Only use the test leads provided with the meter. If leads are
damaged or need to be replaced, use similar leads with
matching specifications.

• Ensure the meter works properly by testing a known voltage
source firstly. If not working properly, the protective equipment
may be damaged; have the meter serviced before using.

• Do not place meter in a strong magnetic field; this may cause
false readings.

• Do not place the meter in any environment with high pressure,
high temperature, dust, explosive gas or vapor.

All the instrument to warm up for 30 sec. before measurement.

WARNING

The special attentio n shoul d be paid when usi ng t he mete r
beca use the imp roper usa ge may cause ele ct ric sho ck a nd

dama ge t he mete r .The sa fe ty meas ures in com mon saf ety
regu latio ns a nd oper ating i ns truct ion sho ul d be comp lied wi th
when usin g. In ord er to m ake fully use of its fun ction s and
ensu re safe o perat ions pl ease co mply wi th th e usage i n thi s
sect ion car ef ully.

• Make sure the test leads are in the correct input jacks before
measurement.

• Choose the highest range when the value to be measured is
unknown beforehand.

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

Important safety information. Read the manual.

High voltage with danger.

Ground.

Double Insulation (Class II safety equipment).

Fuse m ust be re pl aced as p er the sp ec ifica tion he re in.

Acco rd with t he r elate d EU laws a nd r egula tions

AC (Al terna ti ng Curr ent)

DC (Direct Current)