Mastech MS8240A User Manual

FUNC

HOLD

MAX

FUSED FUSED

MS8240A

Digital Multimeters

1. Preface

CONTENTS

5. Measurement Operation

5.1 DC Voltage and

AC Voltage Measurement

5.2 Resistance Measurement

5.3 Diode Test

5.4 Continuity Measurement

5.5 Capacitance Measurement

5.6 Transistor Measurement

5.7 Frequency Measurement

5.8 Current Measurement

5.9 Temperature Measurement

.....................................................1

........................10

...................10

2. Safety Information

3. Product Overview

...................................1

....................................3

3.1 Product Outline and its Description

3.2 Function Keys

........3

.......................................4

4. Technical Indicators

................................5

4.1 General Characteristics

4.2 Electrical Technical Indicators

.........................5

...............6

....................11

...........................................12

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

..................14

......................15

.....................16

.........................16

..................18

6. Maintenance

...........................................19

6.1 Battery Replacement

6.2 Fuse Replacement

6.3 Others

...........................19

..............................19

................................................19

01

1. Preface

This dig ital mu ltime ter (he reinafter referred to a s
the “m eter” ) is a pock et-si zed multifunction ins trume nt
that uses 4 x1. 5V SIZE AA ba tteri es.
This ser ies of pr oduct s is desi gned with beautiful
appearanc e, firm s truct ure and excellent durability.
It use s elast ic ABS mat erial a nd double-injection
molding des ign, an d has goo d shock -resistant
performan ce.
The mete r meets G B/T 13978 -92 dig ital multimeter
general tec hnolo gy stan dards a nd GB4793.1-1995
(IEC -6101 0-1: 20 01) ele ctron ic measurement
instrumen t safet y requi rements, with class-I I
pollution a nd over -volt age sta ndard CAT III 600V.
Its fu ll func tion pr otect ion ensures the safe and
proper use of t he mete r.
As a gene ral ele ctric al meas uring a nd testing device,
this meter ca n be wide ly used i n the social electronic
fields such a s schoo ls, res earch institutes and fa ctori es.

2. Safety Information

The user shou ld obse rve to th e following safety tips i n

Warning

Plea se part icula rly not e that inappropriate use may
cause shock o r damag e to the me ter. The user
should comp ly with c ommon s afety procedures and
completel y follo w the saf ety measures stated in th is
operation m anual .

In order to mak e full us e of the me ter's functions

and ensure sa fe oper ation , pleas e carefully follow
the procedu res des cribe d in this s ection.

FUNC

HOLD

MAX

FUSED FUSED

0302

orde r to avoi d perso nal inj ury and m eter malfuncti on
that m ay be cau sed by el ectri c shock.

• Do not measur e any vol tage ou tside the measurement
rang e speci fied by t his met er.

• Alth ough th ere is an i ntern al protection circuit in the
resi stanc e measu remen t position, do not apply an y
high v oltag e (abov e 100V) i n the resistance
meas ureme nt posi tion.

• Check the tes t wire fo r any dam age or bare metal.

• The me ter sho uld not b e used in d irect sunlight or high

temp eratu re.

• Please note t hat pos sible e lectric shock may be
caus ed if inp ut volt age exc eeds 36V AC or 48C DC.

• Befo re meas uring c urren t, please first switch off th e
equi pment t o be meas ured, a nd disconnect the
meas ured ci rcuit . Th en, con nect the test probe
secu rely, swit ch on the p ower, an d then start measuring.

• Pay at tenti on to cor rect ba ttery polarity when rep lacin g
batt eries .

• Be sur e to use a fu se with t he same s pecification and
mode l when re placi ng it.

Electric symbols:

Dangerous v oltag e Grou nding

AC

(Alternating Current)

Double insu latio n

Warning,

please see the related instructions in the manual

DC (Direct Cu rrent )

Fuse

AC DC

3. Product Overview

3.1 Product Outline

FRONT PANEL

1

2

3

4

5

6

8

7

11

10

9

04 05

Appearance description

1. Liquid cry stal di splay ( LCD)

2. Max imum ke y

3. Data hold ke y

4. Kno b

5. Inp uts of vo ltage , resis tance, frequency and di ode

6. Common end

7. Inp uts of cu rrent , capac itance and temperatur e

8. Inp ut of lar ge curr ent

9. Pow er swit ch key

10. Fu nctio n choic e

11. Backl ight co ntrol k ey

3.2 Function Keys

Function sw itch ke y: used f or temperature
measuring r ange sw itch (° C and °F), and
diode measu ring ra nge swi tch bet ween diode
mode and cont inuit y mode.

Hold key: Dur ing mea surin g, pres s this key.
The cu rrent d ispla yed rea dout of the meter is
locked on the d ispla y and it wi ll be unl ocked
afte r you pre ss the ke y again .

Maximum key : Durin g measu ring, p ress this
key to d ispla y the cur rentl y measured
maximum of th e meter. P ress ag ain to exit the
maximum dis play mo de.

Backlight f uncti on key: The b acklight will light
on if yo u press a nd hold t his key f or 2 seconds.
It wil l turn off au tomat icall y after 15 seconds.
Press again t o exit th e backl ight function.

Press to swit ch the me ter on or o ff .

FUNC

HOLD

MAX

4. Technical Indicators

4.1 General Characteristics

Manual meas uring r ange DM M, with 1 999 in count
under full ra nge.
Display: 3 1/ 2-bit L CD disp lay
Over load pr otect ion: Fu ll-function and
full -rang e protection.
Data holdin g funct ion
Maximum mea surem ent
Backlight
Low-volta ge disp lay
Auto matic p ower- off
Operating t emper ature a nd humi dity:
0~ 40° C (32~1 04°F);
relative hu midit y <80%R H
Stor age tem perat ure and h umidi ty:

-10~ 5 0°C (14 ~122°F);
relative hu midit y < 70%RH
Power suppl y: 1.5V b atter y (AA type)×4
Safe ty leve l: IEC6 1010- 1 and CAT III 600V
Dimension ( L×W×H ): 205× 102×5 8mm,
Weight : About 39 0g