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DIGITAL MULTIMETER

MAINTENANCE

5.

5.

5.

5. MAINTENANCE

MAINTENANCE

MAINTENANCE

MAINTENANCE

5.1

5.1

5.1

5.1 REPLACING

REPLACING

REPLACING

REPLACING THE

THE

THE

THE BATTER

BATTER

BATTER

BATTERIES

IES

IES

IES

WARNING

WARNING

WARNING

WARNING

T

T

T

To

o

o

o avoid

avoid

avoid

avoid electric

electric

electric

electric shock

shock

shock

shock,,,, make

make

make

make sure

sure

sure

sure that

that

that

that the

the

the

the test

test

test

test

leads

leads

leads

leads have

have

have

have been

been

been

been clearly

clearly

clearly

clearly move

move

move

move away

away

away

away from

from

from

from the

the

the

the circuit

circuit

circuit

circuit

under

under

under

under measurement

measurement

measurement

measurement b

b

b

before

efore

efore

efore opening

opening

opening

opening the

the

the

the battery

battery

battery

battery

cover

cover

cover

cover of

of

of

of the

the

the

the meter

meter

meter

meter....

5.1.1 If the sign “

” appears, it means that the batteries

should be replaced.

5.1.2 Loosen the fixing screw of the battery cover and

remove it.

5.1.3 Replace the exhausted batteries with new ones.

5.1.4 Put the battery cover back and fix it again to its origin

form.

NOTE:

NOTE:

NOTE:

NOTE:

Do not reverse the poles of the batteries.

5.2

5.2

5.2

5.2 REPLACING

REPLACING

REPLACING

REPLACING FUSE

FUSE

FUSE

FUSE

5.2.1 Fuses rarely need replacement.

Almost all blows are

the result of operation errors.

5.2.2 Loosen the fixing screw of the battery cover and

remove it.

5.2.3 Replace the blown fuse with one at the specified

rating.

- 46 -

DIGITAL MULTIMETER

MAINTENANCE

5.2.4 Put the battery cover back and fix it again to its

original form.

WARNING

WARNING

WARNING

WARNING

T

T

T

To

o

o

o avoid

avoid

avoid

avoid electric

electric

electric

electric shock

shock

shock

shock,,,, make

make

make

make sure

sure

sure

sure that

that

that

that the

the

the

the test

test

test

test leads

leads

leads

leads

have

have

have

have been

been

been

been clearly

clearly

clearly

clearly move

move

move

move away

away

away

away from

from

from

from the

the

the

the circuit

circuit

circuit

circuit under

under

under

under

measurement

measurement

measurement

measurement b

b

b

before

efore

efore

efore opening

opening

opening

opening the

the

the

the battery

battery

battery

battery cover

cover

cover

cover of

of

of

of the

the

the

the

meter

meter

meter

meter....

For

For

For

For protection

protection

protection

protection against

against

against

against fire

fire

fire

fire hazard

hazard

hazard

hazard,,,, replace

replace

replace

replace fuses

fuses

fuses

fuses with

with

with

with

specified

specified

specified

specified ratings

ratings

ratings

ratings only

only

only

only:::: F

F

F

F 10A/250V

10A/250V

10A/250V

10A/250V (quick

(quick

(quick

(quick acting).

acting).

acting).

acting).

A

A

A

A

A

A

+

-

-

+

+

-

- 47 -

Summary of Contents for MS8228

Page 1: ... 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 OPERATION ION ION ION INSTRUCTION INSTRUCTION INSTRUCTION INSTRUCTION 23 4 1 MISCONNECTION ALARM 23 4 2 ...

Page 2: ...e 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 exploi...

Page 3: ... terminals and earth ground exceeds 1000V 1 2 6 Select 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 Disconnect the test leads from the circuit under test before turning ...

Page 4: ... performed by a technician who fully understands the meter and the danger involved 1 4 2 Disconnect the test leads from all sources of electric current before opening the battery battery battery battery cover cover cover cover of the mete 1 4 3 To 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...

Page 5: ...The digital multimeter can perform measurements of AC DC voltage and current resistance frequency duty capacitance as well as continuity and diode 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 auto range and manual range are available 6 DIGITAL MULTIMETE...

Page 6: ...o and manual ranges Hz DUTY Button for switching between Hz and duty measurement REL Button for switching to relative measurement 8 DIGITAL MULTIMETER DESCRIPTION NTS Button for switching between and Rotary Selector for selecting functions and ranges OFF Position for turning off the power 10A Input Jack for measuring current 0 10A mA μA hFE Input Jack for measuring current 0 400mA and hFE V Ω Hz I...

Page 7: ... Reading being held hFE hFE hFE hFE Transistor 10 DIGITAL MULTIMETER DESCRIPTION NTS REL REL REL REL Relative measurement AUTO AUTO AUTO AUTO Auto range Battery low Celsius units Temperature Fahrenheir units Temperature RH RH RH RH Relative Humidity units F F F F Farad Capacitance Ω Ω Ω Ω Ohms Resistance V V V V Volts Voltage A A A A Amperes Current Hz Hz Hz Hz Hertz Frequency Duty Cycle Laser Poi...

Page 8: ...ion 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 protection F2 10A 250V quick acting 3 1 15 Operating power 1 5V 3 AAA batteries 3 1 16 Battery low indication on LCD 3 1 17 Temperature factor 0 1 Accuracy 12 DIGITAL MULTIMETER SPECIFICATION NTS 3 1 18 Operating temperature 0 to 40 32 F to 104 F 3 1 19 Storage temperature 10 to 50 10 F...

Page 9: ...age range unsteady readings will appear before the test leads contact the circuit This is normal because the meter is highly sensitive 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 400µA 0 1µA 4000µA 1µA 40mA 10µA 1 2 of reading 3 digits 400mA 100µA 4A 1mA 10A 10mA 2 0 of reading 10digits Ov...

Page 10: ...400µA ranges 40mV 4000µA ranges 400mV 40mA ranges 40mV 400mA ranges 400mV 4A range 40mV 10A range 100mV Frequency range 40 to 400Hz Response average calibrated in rms of sine wave 16 DIGITAL MULTIMETER SPECIFICATION NTS 3 2 5 Resistance Range Resolution Accuracy 400Ω 0 1Ω 1 2 of reading 2 digits 4kΩ 1Ω 40kΩ 10Ω 400k 100Ω 4M 1kΩ 40M 10kΩ 2 0 of reading 5 digits Open circuit voltage 0 25V Overload p...

Page 11: ...range 0 40kHz Input current range 1 4 range rms AC higher input voltage at higher frequency 18 DIGITAL MULTIMETER SPECIFICATION NTS Max input current V jack mV ranges 400mV mA jack µA ranges 4mA mA jack mA ranges 400mA 10A jack 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 ra...

Page 12: ...ent range 3 2 9 Relative Humidity on RH and humidity display Range Resolution Accuracy 20 95 0 1 5 0 RH Operating temperature 0 to 40 Sampling Cycle 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 Sampling Cycle 20s 3 2 10 2 Temperature on sensor infrared...

Page 13: ...ON 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 jac...

Page 14: ...ess 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 Press the Hz DUTY button at the frequency range to switc...

Page 15: ...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 Alt...

Page 16: ...DIGITAL MULTIMETER OPERATING INSTRUCTION NTS 4 4 4 4 10 10 10 10 PREPARATI PREPARATI PREPARATI PREPARATING 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 batteries should be replaced 4 10 2 The symbol beside the input lead shows that the input...

Page 17: ...re 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 WARN...

Page 18: ...0V 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 14 1...

Page 19: ...ATING INSTRUCTION NTS position 4 16 3 Press the SELECT button to switch to AC measurement Then press the RANGE button to choose the auto range or manual range mode 4 16 4 Connect the test leads to the voltage source or load terminals for measurement 4 16 5 Take the reading on the main indicator of the LCD NOTE NOTE NOTE NOTE 1 When the input is open unsteady readings may appear This is normal beca...

Page 20: ...ING AC AC AC AC CURRENT CURRENT CURRENT CURRENT WARNING WARNING WARNING WARNING Beware Beware Beware Beware of of of of Electrocutio Electrocutio Electrocutio Electrocution 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 befo...

Page 21: ...re Beware of of of of Electrocution Electrocution Electrocution Electrocution When When When When measuring measuring measuring measuring in circuit in circuit in circuit in circuit resistance resistance resistance resistance make make make make sure sure sure sure that that that that the the the the power power power power of of of of the the the the circuit circuit circuit circuit under under un...

Page 22: ... test lead into the jack 4 23 2 Set the rotary selector to the Ω range position 40 DIGITAL MULTIMETER OPERATING INSTRUCTION NTS 4 23 3 Press the SELECT button to switch to test 4 23 4 Connect the red test lead to the anode and the black test lead to the cathode of the diode for testing 4 23 5 Take the reading on the main indicator of the LCD NOTE NOTE NOTE NOTE 1 The meter will show the approximat...

Page 23: ...not not connect connect connect connect the the the the input input input input plug plug plug plug to to to to any any any any electric electric electric electric signal signal signal signal 4 25 1 Turn the rotary selector to the IR T range position 4 25 2 Aim the foreside of the meter infrared sensor at the surface to be measured 4 25 3 To ensure that the infrared sensor is targeted at the objec...

Page 24: ...urface of the object is highly reflective 7 Larger discrepancy may result if measurement is taken by the meter through transparent materials such as glass 8 Steam dust smoke etc may affect measurements 4 2 4 2 4 2 4 26 6 6 6 TESTING TESTING TESTING TESTING TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR 4 26 1 Set the rotary selector to the hFE range position 4 26 2 Put two plugs and of transistor tes...

Page 25: ... REPLACING FUSE FUSE FUSE FUSE 5 2 1 Fuses rarely need replacement Almost all blows are the result of operation errors 5 2 2 Loosen the fixing screw of the battery cover and remove it 5 2 3 Replace the blown fuse with one at the specified rating 46 DIGITAL MULTIMETER MAINTENANCE 5 2 4 Put the battery cover back and fix it again to its original form WARNING WARNING WARNING WARNING T T T To o o o av...

Page 26: ...working working working condition condition condition condition with with with with the the the the same same same same or or or or equivalent equivalent equivalent equivalent rating rating rating rating 1000V 1000V 1000V 1000V 10A 10A 10A 10A A test lead must be replaced if the insulation layer has been damaged e g the wire inside is exposed 48 DIGITAL MULTIMETER ACCESSORIES 6 6 6 6 ACCESSORIES A...

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