Mastech MS8228 User manual

DIGITAL
DIGITAL
DIGITAL
DIGITAL MULTIMETER
MULTIMETER
MULTIMETER
MULTIMETER
OPERAT
OPERAT
OPERAT
OPERAT ION
ION
ION
ION MANUAL
MANUAL
MANUAL
MANUAL
DIGITAL MULTIMETER
CONTENTS
CONTENTS
CONTENTS
CONTENTS
CONTENTS
1.
1.
1.
1. SAFETY INFORMATION … 1
1.1 PR ELIMINARY … 1
1.2 DOS AND DON ’ TS … 2
1.3 SYMBOLS … 3
1.4 MAINTENANCE … 4
2.
2.
2.
2. DESCRIPTION
DESCRIPTION
DESCRIPTION
DESCRIPTION … 6
2.1 NAMES OF PARTS … 7
2.2 SWITCH, BUTTONS AND INPUT JACKS … 8
2.3 LIQUID-CRYSTAL
LIQUID-CRYSTAL
LIQUID-CRYSTAL
LIQUID-CRYSTAL DISPLAY
DISPLAY
DISPLAY
DISPLAY (LCD)
(LCD)
(LCD)
(LCD) … 10
3.
3.
3.
3. SPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONS … 12
3.1 GENERAL SPECIFICATIONS … 12
3.2 TECHNICAL SPECIFICATIONS … 13
4.
4.
4.
4. OPERAT
OPERAT
OPERAT
OPERAT ION
ION
ION
ION INSTRUCTION
INSTRUCTION
INSTRUCTION
INSTRUCTION … 23
4.1 MISCONNECTION ALARM … 23
4.2 HOLD ING READINGS … 24
4.3 SWITCHING FUNCTION S … 24
4.4 SWITCHING RANGE S … 24
4.5 SWITCHING BETWEEN FREQUENCY / DUTY … 25
4.6 SWITCHING TO RELATIVE MEASUR EMENT … 25
4.7 BACK LIGHT … 26
4.8 LASER BEAM … 27
4.9 AUTO POWER OFF … 28

DIGITAL MULTIMETER
CONTENTS
4.10 PREPAR ING FOR MEASUREMENT … 29
4.11 MEASURING RELATIVE HUMIDITY … 29
4.12
MEASURING TEMPERATURE
(WITH THERMO-RESISTOR)
… 30
4.1 3 MEASURING DC VOLTAGE … 31
4.1 4 MEASURING AC VOLTAGE … 32
4.1 5 MEASURING DC MILLIVOLTAGE … 33
4.1 6 MEASURING AC MILLIVOLTAGE … 34
4.1 7 MEASURING DC CURRENT … 35
4.1 8 MEASURING AC CURRENT … 37
4.1 9 MEASURING FREQUENCY … 38
4. 20 MEASURING DUTY … 38
4. 21 MEASURING RESISTANCE … 39
4.2 2 MEASURING CAPACITANCE … 40
4.2 3 TESTING DIODE … 40
4.2 4 TESTING CONTINUITY … 41
4.25 TESTING TRANSISTOR … 42
4.26 MEASURING TEMPERATURE
(WITH INFRARED THERMO-SENSOR)
… 44
5. MAINTENANCE … 46
5.1 REPLACING THE BATTER IES … 46
5.2 REPLACING FUSE … 46
5.3 REPLACING TEST LEADS … 48
6.
6.
6.
6. ACCESSORIES
ACCESSORIES
ACCESSORIES
ACCESSORIES … 49
DIGITAL MULTIMETER
SAFETY INFORMATION NTS
1.
1.
1.
1. SAFETY
SAFETY
SAFETY
SAFETY INFORMATION
INFORMATION
INFORMATION
INFORMATION
WARNING
WARNING
WARNING
WARNING
BE
BE
BE
BE EXTREMELY
EXTREMELY
EXTREMELY
EXTREMELY CAREFUL
CAREFUL
CAREFUL
CAREFUL WHEN
WHEN
WHEN
WHEN US
US
US
US ING
ING
ING
ING THIS
THIS
THIS
THIS METER.
METER.
METER.
METER.
Improper
Improper
Improper
Improper use
use
use
use of
of
of
of this
this
this
this device
device
device
device can
can
can
can result
result
result
result in
in
in
in electric
electric
electric
electric shock
shock
shock
shock
or
or
or
or destr
destr
destr
destr uction
uction
uction
uction of
of
of
of the
the
the
the meter.
meter.
meter.
meter. Take
Take
Take
Take all
all
all
all normal
normal
normal
normal safety
safety
safety
safety
precautions
precautions
precautions
precautions and
and
and
and follow
follow
follow
follow the
the
the
the safeguards
safeguards
safeguards
safeguards suggested
suggested
suggested
suggested in
in
in
in
this
this
this
this manual.
manual.
manual.
manual.
To
To
To
To exploit
exploit
exploit
exploit full
full
full
full functionality
functionality
functionality
functionality of
of
of
of the
the
the
the meter
meter
meter
meter and
and
and
and ensure
ensure
ensure
ensure
safe
safe
safe
safe operation,
operation,
operation,
operation, please
please
please
please read
read
read
read carefully
carefully
carefully
carefully and
and
and
and follow
follow
follow
follow the
the
the
the
directions
directions
directions
directions in
in
in
in this
this
this
this manual
manual
manual
manual .
.
.
.
This meter complies with the general technical requirements
for the GB/T 19978-92 multimeter as well as the safety
requirements for GB4793.1-1995 ( IEC-1010 -1:1990)
concerning electronic measuring instruments , with pollution
degree 2 and overvoltage at CAT Ι Ι 10 00V/ CAT Ι Ι Ι 600V.
Follow all safety and operati on instructions to ensure safe
use of the meter.
With proper use and care, th is digital multimeter will give you
years of satisfactory service.
1.1
1.1
1.1
1.1 PRELIMINARY
PRELIMINARY
PRELIMINARY
PRELIMINARY
1.1.1 When using the meter, the user must observe all
normal safety rules concerning:
1) general p rotection against electric shock
2) p rotection of the meter against misuse
- 1 -

DIGITAL MULTIMETER
SAFETY INFORMATION NTS
1.1.2 When the meter is delivered, check whether it has
been damaged in transit.
1.1.3 After being stored and delivered under harsh
conditions, the meter should be checked and
confirmed whether any damages have been incurred.
1.1.4 Test leads must be kept in good condition. Check
whether the insulation on test leads has been
damaged and any wire has been exposed.
1.1.5 Use the test leads supplied to ensure operation safety.
If required , they must be replaced with test leads of the
same model or class.
1.2
1.2
1.2
1.2 DOS
DOS
DOS
DOS AND
AND
AND
AND DON
DON
DON
DON ’
’
’
’ TS
TS
TS
TS
1.2.1 Use the right input jack, function and range.
1.2.2 Do not take measurements that exceed the protection
limit values indicated in the specifications
1.2.3 D o not touch the metal tips of the test leads w hen the
meter is connecte d to the circuit to be measured .
1.2.4 K eep your fingers behind the probe barriers wh en
taking a measurement with an effective voltage above
60V DC or 30V rms AC.
1.2.5 Do not take voltage measure ment if the value between
the terminals and earth ground exceeds 1000V.
1.2.6 S elect the highest range if the value scale to be
measured in the manual range is unknown.
- 2 -
DIGITAL MULTIMETER
SAFETY INFORMATION NTS
1.2.7 Do not connect the meter to any voltage source while
the rotary selector is in the current, resistance,
capacitance, diode, continuity range.
1.2.8 D isconnect the test leads from the circuit under test
b efore turning the rotary selector to change functions.
1.2.9 Be careful that high voltage pulses at test points may
damage the meter w hen measurements are being
taken on the circuit of TV switch power.
1.2.10 Do not measure the resistance ，capacitance, diode or
continuity of live circuits.
1.2.11 Do not take capacitance measurements un til the
capacitor to be measured has been fully discharged.
1.2.12 Do not use the meter near explosive gases , steam or
dirt.
1.2.13 Stop using the meter i f any abnormalities or faults are
observed.
1.2.14 Do not use the meter unless its rear case is securely
fastened in its original position .
1.2.15 D o not store or use the meter in areas exposed to
direct sunlight , at high temperature or with high relative
humidity.
1.3
1.3
1.3
1.3 SYMBOLS
SYMBOLS
SYMBOLS
SYMBOLS
- i mportant safety information ; refer to the operati on
manual.
- d angerous voltage may be presen t .
- 3 -

DIGITAL MULTIMETER
SAFETY INFORMATION NTS
- d ouble insulation （Protection class Ι Ι ）.
CAT II - o vervoltage ( i nstallation) c ategory II, p ollution
d egree 2 per IEC1010-1 , refer ring to the level of
i mpulse w ithstand v oltage protection provided.
CAT III - o vervoltage ( i nstallation) c ategory III, p ollution
d egree 2 per IEC1010-1 , refer ring to the level of
i mpulse w ithstand v oltage protection provided.
- c onforms to European Union Directive
- e arth ground
- fuse
- b attery l ow
1.4
1.4
1.4
1.4 MAINTENANCE
MAINTENANCE
MAINTENANCE
MAINTENANCE
1.4.1 D o not attempt to remov e the rear case to adjust or
repair the meter. Such actions should only be
performed by a technician who fully understands the
meter and the danger involved.
1.4.2 D isconnect the test leads from all sources of electric
current b efore opening the battery
battery
battery
battery cover
cover
cover
cover of the mete .
1.4.3 T o avoid any electric shock caused by error readings,
replace the batteries immediately when the “ ” sign
appears on the display .
1.4.4 To avoid fire hazards , the replace ment fuse must meet
the specified voltage and current at F 10A/250V (quick
acting ) .
- 4 -
DIGITAL MULTIMETER
SAFETY INFORMATION NTS
1.4.5 Use damp cloth and mild detergent to clean the meter;
do not use abrasives or solvents.
1.4.6 Turn the rotary selector to OFF position to switch off
the power when the meter is not in use.
1.4. 7 Remove the batteries to avoid damages to the meter i f
it will idle for a long time.
- 5 -

DIGITAL MULTIMETER
DESCRIPTION NTS
2.
2.
2.
2. DESCRIPTION
DESCRIPTION
DESCRIPTION
DESCRIPTION
- This meter is a portable professional measuring
instrument with large LCD to show three lines of
readings, as well as back light for easily reading. The
‘ single-hand operation ’ design for the range switch
makes measurement simple and easy. Overload
protection and low battery indication are provided. It
is an ideal multi-function i nstrument with scores of
practical applications for professional, workshop,
school, hobby and home use.
- The meter is devised with light and sound alarm to
prevent misconnection of test leads and provide
additional protection against damages caused by
improper operation.
- The h umidity and t emperature functions are suitable for
measur ing ambient humidity and temperature, as well
as temperature of objects .
- The digital m ultimeter can perform measurements of
AC/DC v oltage and c urrent, r esistance ，f requency, d uty,
c apacitance , a s well as c ontinuity and d iode test.
- The non-contact infrared temperature measurement
function makes it more convenient and safe to
measure temperatures.
- Both the reading and unit of measurement are displayed
on the LCD.
- Both a uto range and manual range are available
- 6 -
DIGITAL MULTIMETER
DESCRIPTION NTS
- This meter is equipped with auto power off function .
- This meter is equipped with reading h o ld function .
- This meter is equipped with relative meas urement
function .
2.1
2.1
2.1
2.1 NAMES
NAMES
NAMES
NAMES OF
OF
OF
OF PART
PART
PART
PART S
S
S
S
uA/mA
uA/mA
uA/mA
uA/mA
10A
10A
10A
10A
1000V
1000V
1000V
1000V
COM
COM
COM
COM
CAT III
CAT III
CAT III
CAT III
1 ) LCD (Liquid-crystal
(Liquid-crystal
(Liquid-crystal
(Liquid-crystal display)
display)
display)
display)
2 ) Auto/ m anual switch b utton (RANGE)
3 ) Relative m easur ement switch b utton (REL)
4 ) Reading h old/ b ack l ight b utton (HOLD/B.L . )
5 ) Hz/ d uty switch b utton (Hz/DUTY)
- 7 -

DIGITAL MULTIMETER
DESCRIPTION NTS
6 ) Panel
7 ) Rotary selector
8 ) 10A i nput j ack
9 ) mA/ μ A/hFE i nput j ack
10 ) COM i nput j ack
11 ) V 、Ω、Hz 、 、 input jack
12) OFF - switch of power
1 3) Function switch b utton (SELECT)
1 4) ℃/℉switch b utton ( ℃/℉)
1 5) Humidity & Temperature s ensor
1 6) Infrared THERMO-Sensor
1 7) Laser Pointer
2.2
2.2
2.2
2.2 SWITCH,
SWITCH,
SWITCH,
SWITCH, BUTTONS
BUTTONS
BUTTONS
BUTTONS AND
AND
AND
AND INPUT
INPUT
INPUT
INPUT JACK
JACK
JACK
JACK S
S
S
S
HOLD/B.L . Button
- for holding the reading or control backlight
SELECT Button
- for switching among measuring function s
RANGE Button
- for switching between a uto and m anual r ange s .
Hz/D UTY Button
- for switching between Hz and d uty measur ement .
REL Button
- for switching to re lative measur ement .
- 8 -
DIGITAL MULTIMETER
DESCRIPTION NTS
℃/℉Button ( ℃/℉)
- for switching between ℃and ℉
Rotary Selector
- for select ing functions and ranges.
OFF Position
- for turn ing off the power.
10A I nput J ack
- for measuring current 0 ~ 10A.
mA/ μ A/hFE Input Jack
- for measuring current 0 ~ 400mA and hFE
V、Ω、Hz 、 、 Input Jack
- for measuring voltage, resistance, frequency, duty,
capacitance, diode, and continuity.
COM Input Jack
- c ommon input connection for current, voltage,
resistance, frequency, duty, capacitance, diode, continuity,
hFE measurement.
Humidity Sensor
- for measur ing humidity.
Infrared THERMO-Sensor
- for infrared temperature measu ring
Laser Pointer
- for take aim object ( infrared temperature measu ring)
- 9 -

DIGITAL MULTIMETER
DESCRIPTION NTS
2.3
2.3
2.3
2.3 LIQUID-CRYSTAL
LIQUID-CRYSTAL
LIQUID-CRYSTAL
LIQUID-CRYSTAL DISPLAY
DISPLAY
DISPLAY
DISPLAY (LCD)
(LCD)
(LCD)
(LCD)
1) Temperature indicator
2) Humidity indicator
3) Main indicator
~
~
~
~ AC
AC
AC
AC AC
AC
AC
AC (a lternating current )
DC
DC
DC
DC DC
DC
DC
DC (direct current )
AC or DC (alternating current or direct current)
Diode
Continuity buzzer
H
H
H
HReading being held
hFE
hFE
hFE
hFE Transistor
- 10 -
DIGITAL MULTIMETER
DESCRIPTION NTS
REL
REL
REL
REL Relative m easure ment
AUTO
AUTO
AUTO
AUTO Auto range
B attery low
℃Celsius units (Temperature)
℉Fahrenheir units (Temperature)
%RH
%RH
%RH
%RH Relative Humidity units
F
F
F
FFarad (Capacitance)
Ω
Ω
Ω
ΩOhms (Resistance)
V
V
V
VVolts (Voltage)
A
A
A
AAmperes (Current)
Hz
Hz
Hz
Hz Hertz (Frequency)
%
%
%
%Duty Cycle
Laser Pointer
IR-T
IR-T
IR-T
IR-T I nfrared T emperature
ε
ε
ε
ε =
=
=
= 0.95
0.95
0.95
0.95 E missivity
n
n
n
n、μ
μ
μ
μ、m
m
m
m、k
k
k
k、M
M
M
MUnit of measure prefixes: nano, micro,
milli, kilo and mega
- 11 -

DIGITAL MULTIMETER
SPECIFICATION NTS
3.
3.
3.
3. SPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONS
Calibration is required once a year, to be carried out at a
temperature between 18 ° C and 28 ° C ( 64 °F to 82 °F ) and
relative humidity below 75%.
3.1
3.1
3.1
3.1 GENERAL
GENERAL
GENERAL
GENERAL SPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONS
3.1.1 The meter is devised with light and sound alarm to
prevent test leads misconnection.
3.1.2 Auto range and manual range options are available .
3.1.3 Overrange protection is provided for all ranges.
3.1.4 Max imum v oltage b etween t erminals a nd e arth
g round: 10 00V DC or rms AC
3.1.5 Operating a ltitude: max. 2000 meters (7000 ft.)
3.1.6 Display: LCD , 3 readings at the same time
3.1.7 Max imum v alue display : 3999 digits
3.1.8 Polarity i ndication: automatic; ‘ - ‘ for negative polarity.
3.1.9 Overrange i ndication: ‘ 0L ’ or ‘ -0L ’
3.1.10 Sampling t ime: approx. 0.4 second per sample
3.1.11 Unit indication : function and unit .
3.1.12 Auto power off time: 30 min.
3.1.13 Specification of resettable fuse: F1 500mA/250V
3.1.14 Fuse p rotection: F 2 10A/250V ( quick acting ).
3.1.15 Operating p ower : 1.5V × 3 AAA batter ies
3.1.16 Battery l ow i ndication: ‘ ’ on LCD
3.1.17 Temperature f actor: < 0.1 × Accuracy / ℃
- 12 -
DIGITAL MULTIMETER
SPECIFICATION NTS
3.1.18 Operating t emperature: 0 ℃to 40 ℃ （ 32 °F to 104 °F）
3.1.19 Storage t emperature: -10 ℃to 50 ℃ （ 10 °F to 122 °F）
3.1.20 Dimension: 195 × 92 × 55mm
3.1.21 Weight: approximate 400g （including batter ies ）
3.2
3.2
3.2
3.2 TECHNICAL
TECHNICAL
TECHNICAL
TECHNICAL SPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONS
Ambient t emperature: 23 ±5℃Relative h umidity: < 75%
3.2.1 DC Voltage
Range Resolution Accuracy
40mV 0.01mV
400mV 0.1mV
±(0.7% of r ea d ing + 2 digits)
4V 1mV
40V 10mV
400V 100mV
1000V 1V
- Input Impedance: 10M Ω
- Overload p rotection:
40mV~ 400mV range: 250V DC or rms AC,
4V-1000V ranges: 1000V DC or 750V rms AC.
- Max. i nput v oltage: 1000V DC or 750V rms AC
NOTE:
NOTE:
NOTE:
NOTE:
At small voltage range, unsteady reading s will appear before
the test leads conta c t the circuit . This is normal because
the meter is highly sensiti ve . When the test leads contact
- 13 -

DIGITAL MULTIMETER
SPECIFICATION NTS
the circuit, the true reading will be shown .
3.2.2 AC Voltage
Range Resolution Accuracy
40mV 0.01mV
400mV 0.1mV
4V 1mV ±(0.8% of r ea d in g + 3 digits)
40V 10mV
400V 100mV
750V 1V ±(1.0% of r ea d in g + 3 digits)
- Input Impedance: 10M Ω
- Overload p rotection:
40mV~ 400mV range: 250V DC or rms AC,
4V-750V ranges: 1000V DC or rms 750V AC.
- Max. i nput v oltage: 1000V DC or rms 750V AC
- Frequency r ange: 40 to 400Hz
- Response: a verage, calibrated in rms of sine wave
NOTE:
NOTE:
NOTE:
NOTE:
At small voltage range, unsteady reading s will appear before
the test leads conta c t the circuit . This is normal because
the meter is highly sensiti ve . When the test leads contact
the circuit, the true reading will be shown .
- 14 -
DIGITAL MULTIMETER
SPECIFICATION NTS
3.2.3 DC Current
Range Resolution Accuracy
400 µA 0.1 µA
4000 µA 1 µA
40mA 10 µA±（1.2% of reading + 3 digits ）
400mA 100 µA
4A 1mA
10A 10mA ±（2.0% of reading + 10digits ）
- Overload protection:
µA、mA ranges: resettable fuses F1 500mA/250V
10A range: F2 10A/250V fuse (quick acting).
- Max. input current:
mA jack （µA ranges ）: 4mA,
mA jack （mA ranges ）: 400mA,
10A jack: 10A
- voltage drop ：
400 µA ranges: 40mV,
4000 µA ranges: 400mV,
40mA ranges: 40mV,
400mA ranges: 400mV,
4A range: 40mV
10A range: 100mV
- 15 -

DIGITAL MULTIMETER
SPECIFICATION NTS
3.2.4 AC Current
Range Resolution Accuracy
400 µA 0.1 µA
4000 µA 1 µA
40mA 10 µA±（1.5% of reading + 5 digits ）
400mA 100 µA
4A 1mA
10A 10mA ±（3.0% of reading + 10 digits ）
- Overload protection:
µA、mA ranges: resettable fuses F1 500mA/250V
10A range: F2 10A/250V fuse (quick acting),.
- Max. i nput c urrent:
mA j ack （µ A ranges ）: 4mA,
mA j ack （mA ranges ）: 400mA,
10A j ack: 10A
- voltage drop ：
400 µ A ranges: 40mV,
4000 µA ranges: 400mV,
40mA ranges: 40mV,
400mA ranges: 400mV,
4A range: 40mV
10A range: 100mV
- Frequency r ange: 40 to 400Hz
- Response: a verage, calibrated in rms of sine wave
- 16 -
DIGITAL MULTIMETER
SPECIFICATION NTS
3.2. 5 Resistance
Range Resolution Accuracy
400 Ω0.1 Ω
±(1.2% of r ea d ing + 2 digits)
4k Ω1Ω
40k Ω10 Ω
400k( 100 Ω
4M( 1k Ω
40M( 10k Ω ± (2.0% of reading + 5 digits)
- Open circuit voltage: ~0.25V
- Overload protection: 250V DC or rms AC
3.2.6 Capacitance
Range Resolution Accuracy
40nF 10pF
400nF 0.1nF
4µF 1nF ±（3.0% of r ea d ing + 3 digits ）
40 µF 10nF
1 00 µF 100nF
- Overload p rotection: 250V DC or rms AC
- 17 -