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 -

DIGITAL MULTIMETER
SPECIFICATION NTS
3.2. 7 Frequency
Range Resolution Accuracy
9.999Hz 0.001Hz ±（2.0% of r ea d ing + 5 digits ）
99.99Hz 0.01Hz
999.9Hz 0.1Hz ±（1.5% of r ea d ing + 5 digits ）
9.999kHz 1Hz
99.99kHz 10Hz
199.9kHz 100Hz ±（2.0% of r ea d ing + 5 digits ）
>200kHz for refer e nce only
- by Hz range:
Measurement range: 0 ~ 200kHz
Input v oltage range: 0.5V – 10V rms AC ( higher input
voltage at higher frequency)
Overload protection: 250V DC or rms AC
- by V range:
Measurement range: 0 ~ 40kHz
Input v oltage range: 0.5V – 750V rms AC ( higher input
voltage at higher frequency)
Input Impedance: 10M Ω
Max. i nput v oltage: 1000V DC or 750V rms AC
- by mV, µA , mA or A range:
Measurement range: 0 ~ 40kHz
Input current range: ≥ 1/4 range rms AC ( higher input
voltage at higher frequency)
- 18 -
DIGITAL MULTIMETER
SPECIFICATION NTS
- Max. i nput c urrent:
V j ack （mV ranges ）: 4 00 m V
mA j ack （µ A ranges ）: 4mA,
mA j ack （mA ranges ）: 400mA,
10A j ack: 10A
- Overload Protection:
mV ranges: 250V DC or rms AC
µA、mA ranges: resettable fuses F1 500mA/250V
10A range: F2 10A/250V fuse (quick acting).
NOTE:
When measuring frequency, the range by Hz range is larger
than that by the Hz of voltage range or current range, but the
value measured beyond the range is for reference only.
3.2.8 Duty
Range Resolution Accuracy
0.1 - 99.9% 0.1% ±3.0%
- By Hz range:
Frequency r esponse: 0 ~ 200kHz
Input v oltage range: 0.5V – 10V rms AC ( higher input
voltage at higher frequency)
Overload protection: 250V DC or rms AC ( higher input
voltage at higher frequency)
- By V range:
Frequency r esponse: 0 ~ 40kHz
- 19 -

DIGITAL MULTIMETER
SPECIFICATION NTS
Input v oltage range: 0.5V – 600V rms AC ( higher input
voltage at higher frequency)
Input Impedance: 10M Ω
Max. Input Voltage: 1000V DC or 750V rms AC
- By mV, µA , mA or A range:
Frequency r esponse: 0 ~ 40kHz
Input current range: ≥ 1/4 of the rms AC for the range
( higher input voltage at higher frequency)
- Max. i nput c urrent:
V j ack （mV ranges ）: 4 00 m V
mA j ack （µA ranges ）: 4mA,
mA j ack （mA ranges ）: 400mA,
10A j ack: 10A
- Overload p rotection:
mV ranges: 250V DC or rms AC
µA、mA ranges: resettable fuses F1 500mA/250V
10A range: F 2 10A/250V fuse (quick acting).
NOTE:
NOTE:
NOTE:
NOTE:
T he range by DUTY of the Hz range is larger than that of the
v oltage range or current range.
3.2. 9 Relative Humidity （on RH and humidity display ）
Range Resolution Accuracy
2 0 - 95% 0.1% ±5.0%RH
- Operating t emperature: 0 ℃to 40 ℃
- S ampling C ycle: ~ 20s .
- 20 -
DIGITAL MULTIMETER
SPECIFICATION NTS
3.2. 10 Temperature
3.2. 10.1 Temperature （on sensor, thermoresistor NTC and
temperature display ）
Range Resolution Accuracy
℃0.1 ℃0℃to 40 ℃±2℃
℉0.1 ℉32 ℉to 104 ℉±4℉
S ampling C ycle: ~ 20s .
3.2. 10.2 Temperature （on sensor, infrared thermocouple and
main display ）
Range Resolution Accuracy
℃1℃-20 ℃to 270 ℃±( 2 .0% of reading + 3 d igits)
-270 ℃to 300 ℃±4 .0% of reading
℉1℉-4 ℉to 520 ℉±( 2 .0% of reading + 6 d igits)
3.2. 11 Sound Level （dB ）
Range Resolution Accuracy
40-100dB 0.1 dB ±3.5%dB at 94dB, 1kHz sine wave
- Typical i nstrument f requency r ange: 100 ~ 8000Hz
3.2. 1 2 Continuity Test
Range Function
Built-in buzzer will sound if resistance is
lower than 40 Ω.
- Open circuit voltage ~ 0.5V
- Overload Protection: 250V DC or rms AC
- 21 -

DIGITAL MULTIMETER
SPECIFICATION NTS
3.2. 1 3 L uminance （Lux ）
Range Resolution Accuracy
Lux (4000) 1 Lux ±（5.0% of r ea d in g + 10 digits ）
at color temp. 285 6 K
calibrated to standard
incandescent lamp
× 10Lux
(40000) 10Lux
- Repeatability: ± 2%.
3.2. 1 4 Diode Test
Range Resolution Function
1mV d isplay ing approximate
forward voltage of diode
- Forward DC c urrent ~ 1mA
- Reversed DC v oltage ~ 1.5V
- Overload Protection: 250V DC or rms AC
3.2.1 5 Transistor hFE
Range Function
hFE Display ing approximate hFE value 1 -1000 β
for transistor under test (ALL TYPE)
- Base c urrent: ~10 µA，Vce: ~ 2V
- Overload p rotection: resettable fuses F1 500mA/250V.
- 22 -
DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
4.
4.
4.
4. OPERATING
OPERATING
OPERATING
OPERATING INSTRUCTION
INSTRUCTION
INSTRUCTION
INSTRUCTION
4.
4.
4.
4. 1
1
1
1 MISCONNECTION
MISCONNECTION
MISCONNECTION
MISCONNECTION ALARM
ALARM
ALARM
ALARM
The input jacks of the meter are equipped with sound and
light alarms against misconnection of test leads.
4. 1 .1 At V 、Ω、Hz 、Duty 、 、 ranges:
1）The red lights at the “ IN ” and “ COM ” jacks will be off
after the test leads are plugged in.
2）The buzzer will sound upon misconnection of the test
leads in the “ mA ” or “ 10A ” jacks to warn the user. At
the same time, the lights at the “ IN ” and “ COM ” jacks
will flash to remind the user to plug in the test leads
there.
4. 1 .2 At μ A 、mA , hFE ranges ：
1）The red lights at the “ mA ” and “ COM ” jacks will be off
after the test leads are plugged in.
2）The buzzer will sound upon misconnection of the test
leads in the “ IN ” or “ 10A ” jacks to warn the user. At
the same time, the red lights at the “ mA ” and “ COM ”
jacks will flash to remind the user to plug in the test
leads there.
4. 1 .3 At 10A range ：
1 ) The red lights at the “ 10A ” and “ COM ” jacks will be off
after the test leads are plugged in.
2 ) The buzzer will sound upon misconnection of the test
leads in the “ IN ” or “ mA ” jacks to warn the user.
- 23 -

DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
At the same time, the lights at the “ 10A ” and “ COM ”
jacks will flash to remind the user to plug in the test
leads there.
4. 1 .4 At IR-T range, whether the test leads are plugged in or
otherwise, the meter will make no response because
no signal input is required from the input terminals.
4.
4.
4.
4. 2
2
2
2 HOLD
HOLD
HOLD
HOLD ING
ING
ING
ING READINGS
READINGS
READINGS
READINGS
1）Press the “ HOLD/B.L ” button to hold the readings while
taking measur ement , and the value on the display will
be held.
2）Press the “ HOLD/B.L ” button again to release the
READING HOLD function .
4.3
4.3
4.3
4.3 SWITCHING
SWITCHING
SWITCHING
SWITCHING FUNCTION
FUNCTION
FUNCTION
FUNCTION S
S
S
S
1）P ress the " SELECT " button to switch between AC and
DC measurement at the current and voltage ranges .
2）P ress the " SELECT " button to switch among
resistance, diode and continuity ranges .
4.4
4.4
4.4
4.4 SWITCHING
SWITCHING
SWITCHING
SWITCHING RANGE
RANGE
RANGE
RANGE S
S
S
S
1）When the meter is turned on, it is at the a uto range
mode for measuring current, voltage and resistance .
2）P ress the "RANGE" button for manual range mode.
The range will go up one level at each press and return
- 24 -
DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
to the lowest level when the highest level is reached .
3）Press the "RANGE" button for two or more seconds to
return to the auto range.
4.5
4.5
4.5
4.5 SWITCHING
SWITCHING
SWITCHING
SWITCHING BETWEEN
BETWEEN
BETWEEN
BETWEEN FREQUENCY
FREQUENCY
FREQUENCY
FREQUENCY /DUTY
/DUTY
/DUTY
/DUTY
1）P ress the “ Hz/DUTY ” button at the frequency range to
switch between frequency and duty measurement .
2）When the meter is at the voltage and current range s ,
press the “ Hz/DUTY ” button to measure the frequency
of the voltage or current signal. Another press on the
“ Hz/DUTY ” button will change into the Duty range for
measuring the duty cycle of the voltage or current
signal.
3）P ress the “ Hz/DUTY ” again to resume the meter to
voltage and current measur ement at the manual range
mode.
4.6
4.6
4.6
4.6 SWITCHING
SWITCHING
SWITCHING
SWITCHING TO
TO
TO
TO RELATIVE
RELATIVE
RELATIVE
RELATIVE MEASURE
MEASURE
MEASURE
MEASURE MENT
MENT
MENT
MENT
1）Press the “ REL ” button to enter the relative
measurement mode w hen taking measur ements.
The initial reading will resume zero.
2）At the relative measurement mode, the existing reading
will be stored in the memory as reference value for later
measurements. The displayed reading is the difference
between the input value and reference value. i.e.
REL (present reading) = input value - reference value
- 25 -

DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
3）The meter will enter the manual range mode after the
“ REL ” button is pressed. REL mode is not available
for Hz/Duty range because it is an automatic range.
4) Press the “ REL ” button again to cancel the relative
measurement function.
5）Pressing the “ REL ” button at the HOLD mode will
cancel the HOLD function. The actual measurement
value taken will be stored in the memory as reference
value. The readings displayed for measurements
taken afterwards will be the difference between the
input value and the reference value.
6）Press the “ RANGE ” , “ SELECT ” buttons or turning the
rotary selector to cancel the relative measurement
function and resume normal measurement. The REL
symbol on the display will disappear.
7）OL triggering: Under the REL mode, OL (over limit) will
flash on the display if the input value exceeds the
allowed value for that range. Press the “ REL ” button
again to cancel the relative measurement function.
The REL mode cannot be entered when OL is flashing.
4.
4.
4.
4. 7
7
7
7 BACK
BACK
BACK
BACK LIGHT
LIGHT
LIGHT
LIGHT
1）P ress the ” HOLD/B.L ” button for two or more seconds
to switch on the back light if the light in the
environment is too dim for taking reading , .
2）Press the “ HOLD/B.L ” button for two or more seconds
- 26 -
DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
again to switch off the back light.
3）The back light will go off automatically after 10
seconds.
NOTE:
NOTE:
NOTE:
NOTE:
1) LED , which requires a larger working current, is the
main source of back light. A lthough the meter is
equipped with a timer set at 10 seconds ( i.e. the back
light will be off automatically after 10 seconds) ,
frequent use of the back light will shorten the life of the
batter ies. Therefore, do not use the back light unless
necessary.
2) When the battery voltage is ≤ 3.6V , the symbol “ ”
（battery low ）will appear on the LCD. When the
back lig ht is on, even if the batter is ≥ 3.6V , the “ ”
may appear because of its large working current which
will cause the voltage to drop. ( T he accuracy of the
measurement cannot be assured w hen the
“ “ symbol appear s. ) In this case, y ou need not
replace the batter ies yet . N ormally , the batteries can
last until the “ ” appears when the back light is not
being used.
4.
4.
4.
4. 8
8
8
8 LASER
LASER
LASER
LASER BEA
BEA
BEA
BEA M
M
M
M
Press the “ ” button f or infrared temperature measurement.
A laser beam will be transmitted to facilitate targeting at the
object for more accurate result.
- 27 -

DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
NOTE:
NOTE:
NOTE:
NOTE:
1) The laser pointer requires a larger working current .
Frequent use of laser beam will shorten the life of the
batter ies. Therefore laser beam should not be use d
unless necessary.
2) When the battery voltage is ≤ 3.6V , the symbol “ ”
（battery low ）will appear on the LCD. When laser
beam is being used, even if the batter is ≥ 3.6V , the
“ ” may appear because of its large working current
which will cause the voltage to drop. ( T he accuracy
of the measurement cannot be assured w hen the
“ “ symbol appear s. ) In this case, y ou need not
replace the batter ies yet . N ormally , the batteries can
last until the “ ” appears when laser beam is not
being used.
4.9
4.9
4.9
4.9 AUTO
AUTO
AUTO
AUTO POWER
POWER
POWER
POWER OFF
OFF
OFF
OFF
1）If there is no any operation within any thirty minute
period after the power is on, the meter will enter the
auto power off mode .
2）Turn the rotary selector or press any of the
“ HOLD/B.L ” , “ SELECT ” , “ RANGE ” , “ Hz/DUTY ” or
“ REL ” button to resume operation of the meter under
auto the power off mode .
3）P ress the “ SELECT ” button to disable the auto power
off function .
- 28 -
DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
4.
4.
4.
4. 10
10
10
10 PREPARATI
PREPARATI
PREPARATI
PREPARATI NG
NG
NG
NG FOR
FOR
FOR
FOR MEASUREMENT
MEASUREMENT
MEASUREMENT
MEASUREMENT
4. 10 .1 Switch on the power by turning the rotary selector . If
the battery voltage is lower than 3.6V, the “ ”
symbol will appear and the batter ies should be
replaced .
4. 10 .2 The “ ” symbol beside the input lead shows that
the input voltage or current should not exceed the
specified value in order to protect the in ternal circuit
from damag e .
4. 10 .3 Turn the rotary selector to the required function and
range to be measured. Under the manual mode ,
choose the highest range when the value scale to be
measured is unknown.
4. 10 .4 Connect the common test lead first and then the
charged test lead w hen making connection . Take away
the charged test lead first w hen disconnecting .
4.
4.
4.
4. 11
11
11
11 MEASURING
MEASURING
MEASURING
MEASURING RELATIVE HUMIDITY
HUMIDITY
HUMIDITY
HUMIDITY
4. 11 .1 This function is used for measuring the ambient
humidity around the meter.
4. 11 .2 Turn the rotary selector away from the OFF position.
4. 11 .3 The current ambient humidity will be shown on the
humidity display of the LCD .
NOTE:
NOTE:
NOTE:
NOTE:
1）The humidity sensor is placed inside the front part of the
meter and therefore it may take a longer time to reach
- 29 -

DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
balance with the environment being measured.
Furthermore, it takes a longer intermission time, about
20 seconds, for sampling and the meter has to be
exposed to the environment for a longer time for
accurate reading. Hence it is not suitable for
measuring rapidly changing ambient humidity.
2）It will take some time for a steady RH reading w hen the
ambient humidity changes.
4.
4.
4.
4. 12
12
12
12 MEASURING
MEASURING
MEASURING
MEASURING TEMPERATURE
TEMPERATURE
TEMPERATURE
TEMPERATURE
(WITH
(WITH
(WITH
(WITH THERMO-RESISTOR)
THERMO-RESISTOR)
THERMO-RESISTOR)
THERMO-RESISTOR)
4. 12.1 This function is used for measuring the ambient
temperature around the meter.
4.12.2 Turn the rotary selector away from the OFF position.
4.12.3 The current ambient temperature will be shown on
the temperature indicator of the LCD.
4.12.4 Press the " ℃/℉" button to switch between ℃and ℉
measurement.
NOTE:
NOTE:
NOTE:
NOTE:
1）The temperature sensor (thermo-resistor) is placed
inside the front part of the meter and therefore it may
take a longer time to reach thermal balance with the
environment. Furthermore, it takes a longer
intermission time, about 20 seconds, for sampling and
the meter has to be exposed to the environment for a
longer time for accurate reading. Hence it is not
suitable for measuring rapidly changing ambient
- 30 -
DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
temperature.
2）The working temperature of the meter is 0 ~ 40 ℃. As
the temperature sensor is placed inside the meter, this
function is applicable for measuring ambient
temperature between 0 and 40 ℃.
3）If exposed to an environment beyond 0 ~ 40 ℃, the
meter may show a wider range of temperature
measurement, but the accuracy cannot be ensured
and damage to the meter may be caused.
4.
4.
4.
4. 13
13
13
13 MEASURING
MEASURING
MEASURING
MEASURING DC
DC
DC
DC VOLTAGE
VOLTAGE
VOLTAGE
VOLTAGE
WARNING
WARNING
WARNING
WARNING
Beware
Beware
Beware
Beware of
of
of
of e
e
e
e lectrocution.
lectrocution.
lectrocution.
lectrocution.
Pay
Pay
Pay
Pay special
special
special
special attention
attention
attention
attention to
to
to
to avoid
avoid
avoid
avoid electric
electric
electric
electric shock
shock
shock
shock when
when
when
when
measuring
measuring
measuring
measuring high
high
high
high voltage.
voltage.
voltage.
voltage.
Do
Do
Do
Do not
not
not
not input
input
input
input any
any
any
any voltage
voltage
voltage
voltage over
over
over
over 1000V
1000V
1000V
1000V DC
DC
DC
DC ,
,
,
, which
which
which
which may
may
may
may
destroy
destroy
destroy
destroy the
the
the
the in
in
in
in ternal
ternal
ternal
ternal circuit
circuit
circuit
circuit ,
,
,
, although
although
although
although a
a
a
a higher
higher
higher
higher voltage
voltage
voltage
voltage
can
can
can
can be
be
be
be shown
shown
shown
shown .
.
.
.
4. 13. 1 Plug the black test lead into the COM jack and the
red test lead in to the V jack.
4. 13 .2 Set the rotary selector to the V range position.
4. 13 .3 Press the "SELECT" button to switch to DC
measurement. Then press the “ RANGE ” button to
choose the a uto range or manual range mode.
4. 13 .4 Connect the test leads to the voltage source or load
for measurement.
- 31 -

DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
4. 13 .5 Take the reading on the main indicator of the LCD.
The polarity symbol denotes the polarity of the end
connected by the red test lead.
NOTE:
NOTE:
NOTE:
NOTE:
1) 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 .
2) Under the manual range mode, when only ‘ OL ’ or ‘ -OL ’
is shown on the LCD , it means the measurement has
exceeded the range . A higher range should be
selected.
3) Under the manual range mode, when the scale of the
value to be measured is unknown beforehand, select
the highest range first and lower the range gradually.
4.1
4.1
4.1
4.1 4
4
4
4 MEASURING
MEASURING
MEASURING
MEASURING AC
AC
AC
AC VOLTAGE
VOLTAGE
VOLTAGE
VOLTAGE
WARNING
WARNING
WARNING
WARNING
Beware
Beware
Beware
Beware of
of
of
of Electrocutio
Electrocutio
Electrocutio
Electrocutio n
n
n
n .
.
.
.
Pay
Pay
Pay
Pay special
special
special
special attention
attention
attention
attention to
to
to
to avoid
avoid
avoid
avoid electric
electric
electric
electric shock
shock
shock
shock when
when
when
when
measuring
measuring
measuring
measuring high
high
high
high voltage.
voltage.
voltage.
voltage.
Do
Do
Do
Do not
not
not
not input
input
input
input any
any
any
any voltage
voltage
voltage
voltage 750V
750V
750V
750V rms
rms
rms
rms AC
AC
AC
AC ,
,
,
, which
which
which
which may
may
may
may
destroy
destroy
destroy
destroy the
the
the
the inner
inner
inner
inner circuit
circuit
circuit
circuit ,
,
,
, although
although
although
although a
a
a
a higher
higher
higher
higher voltage
voltage
voltage
voltage
can
can
can
can be
be
be
be shown
shown
shown
shown .
.
.
.
- 32 -
DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
4. 1 4 .1 Plug the black test lead into the COM jack and the
red test lead in to the V jack.
4. 1 4 .2 Set the rotary selector to the V range position.
4. 1 4 .3 Press the "SELECT" button to switch to AC
measurement. Then press the “ RANGE ” button to
choose the a uto range or manual range mode.
4. 1 4 .4 Connect the test leads to the voltage source or load
terminals for measurement.
4. 1 4 .5 Take the reading on the main indicator of the LCD.
NOTE:
NOTE:
NOTE:
NOTE:
1) At small voltage range, unsteady reading s may 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 .
2) At the manual range mode, when only ‘ OL ’ or ‘ -OL ’ is
shown on the LCD, it means the measurement has
exceeded the range . A higher range should be
selected.
3) At the manual range mode, when the scale of the value
to be measured is unknown beforehand, select the
highest range first and lower the range gradually.
4.1
4.1
4.1
4.1 5
5
5
5 MEASURING
MEASURING
MEASURING
MEASURING DC
DC
DC
DC MILLIVOLTAGE
MILLIVOLTAGE
MILLIVOLTAGE
MILLIVOLTAGE
4. 1 5 .1 Plug the black test lead into the COM jack and the
red test lead in to the V jack.
- 33 -

DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
4. 1 5 .2 Set the rotary selector to the m V range
position.
4. 1 5 .3 Press the "SELECT" button to switch to DC
measurement. Then press the “ RANGE ” button to
choose the a uto range or manual range mode.
4. 1 5 .4 Connect the test leads to the voltage source or load
terminals for measurement.
4. 1 5 .5 Take the reading on the main indicator of the LCD.
The polarity symbol denotes the polarity of the end
NOTE:
NOTE:
NOTE:
NOTE:
1) When the input is open , unsteady reading s may
appear. This is normal because the meter is highly
sensiti ve . When the test leads contact the circuit, the
true reading will be shown .
2) At the manual range mode, when only ‘ OL ’ or ‘ -OL ’ is
shown on the LCD , it means the measurement has
exceeded the range . A higher range should be
selected.
3) At the manual range mode, when the scale of the
value to be measured is unknown beforehand, se t the
rotary selector to the highest range .
4.
4.
4.
4. 1
1
1
1 6
6
6
6 MEASURING
MEASURING
MEASURING
MEASURING AC
AC
AC
AC MILLIVOLTAGE
MILLIVOLTAGE
MILLIVOLTAGE
MILLIVOLTAGE
4. 1 6 . 1 Plug the black test lead into the COM jack and the
red test lead in to the V jack.
4. 1 6 .2 Set the rotary selector to the m V range
- 34 -
DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
position.
4. 1 6 .3 Press the "SELECT" button to switch to A C
measurement. Then press the “ RANGE ” button to
choose the a uto range or manual range mode.
4. 1 6 .4 Connect the test leads to the voltage source or load
terminals for measurement.
4. 1 6 .5 Take the reading on the main indicator of the LCD.
NOTE:
NOTE:
NOTE:
NOTE:
1) When the input is open , unsteady reading s may appear.
This is normal because the meter is highly sensiti ve .
When the test leads contact the circuit, the true
reading will be shown .
2) At the manual range mode, when only ‘ OL ’ or ‘ -OL ’ is
shown on the LCD , it means the measurement has
exceeded the range . A higher range should be
selected.
3) Under the manual range mode, when the scale of the
value to be measured is unknown beforehand, se t the
rotary selector to the highest range .
4.1
4.1
4.1
4.1 7
7
7
7 MEASURING
MEASURING
MEASURING
MEASURING DC
DC
DC
DC CURRENT
CURRENT
CURRENT
CURRENT
WARNING
WARNING
WARNING
WARNING
Beware
Beware
Beware
Beware of
of
of
of Electrocutio
Electrocutio
Electrocutio
Electrocutio n
n
n
n .
.
.
.
Turn
Turn
Turn
Turn off
off
off
off the
the
the
the power
power
power
power of
of
of
of the
the
the
the circuit
circuit
circuit
circuit to
to
to
to be
be
be
be measured
measured
measured
measured
before
before
before
before connecting
connecting
connecting
connecting the
the
the
the meter
meter
meter
meter to
to
to
to the
the
the
the circuit
circuit
circuit
circuit .
.
.
.
- 35 -

DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
4. 1 7 . 1 Plug the black test lead into the COM jack . When
the current to be measured is under 400mA, plug the
red test lead into the mA jack; when the current to be
measured is over 400mA but under 10A, plug the red
test lead in to the 10A jack.
4. 1 7 .2 Set the rotary selector to the A range position.
4. 1 7 .3 Press the "SELECT" button to switch to DC
measurement. Then press the “ RANGE ” button to
choose the a uto range or manual range mode.
4. 1 7 .4 Connect the test leads to the circuit for measurement.
4. 1 7 .5 Take the reading on the main indicator of the LCD.
The polarity symbol denotes the polarity of the end
connected by the red test lead.
NOTE:
NOTE:
NOTE:
NOTE:
1) At the manual range mode, when only ‘ OL ’ or ‘ -OL ’ is
shown on the LCD , it means the measurement has
exceeded the range . A higher range should be
selected.
2 ) At the manual range mode, when the scale of the value
to be measured is unknown beforehand, se t the range
to the highest.
3) “ ” means the maximum current of the mA jack is
400mA and the maximum current of the 10A jack is
10A. A t the 10A jack , current exceeding the limit will
blow the fuse.
- 36 -
DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
4.1
4.1
4.1
4.1 8
8
8
8 MEASURING
MEASURING
MEASURING
MEASURING AC
AC
AC
AC CURRENT
CURRENT
CURRENT
CURRENT
WARNING
WARNING
WARNING
WARNING
Beware
Beware
Beware
Beware of
of
of
of Electrocutio
Electrocutio
Electrocutio
Electrocutio n
n
n
n .
.
.
.
Turn
Turn
Turn
Turn off
off
off
off the
the
the
the power
power
power
power of
of
of
of the
the
the
the circuit
circuit
circuit
circuit to
to
to
to be
be
be
be measured
measured
measured
measured
before
before
before
before connecting
connecting
connecting
connecting the
the
the
the meter
meter
meter
meter to
to
to
to the
the
the
the circuit
circuit
circuit
circuit .
.
.
.
4. 1 8 . 1 Plug the black test lead into the COM jack . When
the current to be measured is under 400mA, plug the
red test lead into the mA jack; when the current to be
measured is over 400mA but under 10A, plug the red
test lead in to the 10A jack.
4. 1 8 .2 Set the rotary selector to the A range position.
4. 1 8 .3 Press the "SELECT" button to switch to A C
measurement. Then press the “ RANGE ” button to
choose the a uto range or manual range mode.
4. 1 8 .4 Connect the test leads to the circuit for measurement.
4. 1 8 .5 Take the reading on the main indicator of the LCD.
NOTE:
NOTE:
NOTE:
NOTE:
1) At the manual range mode, when only ‘ OL ’ or ‘ -OL ’ is
shown on the LCD , it means the measurement has
exceeded the range . A higher range should be
selected.
2 ) Under the manual range mode, when the scale of the
value to be measured is unknown beforehand, se t the
range to the highest.
3) ” means the maximum current of the mA jack is
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