Mastech MS8268 Instruction Manual Download

Page: 17 / 18

5. MAINTENANCE

MAINTENANCE

This

section

provides

basic

maintenance

information,

including fuse and battery replacement instructions.

Do not attempt to repair or service your Meter unless you are

qualified to do so and have the relevant calibration,

performance test, and service information.

5.1

5.1 General

General

General Maintenance

Maintenance

To avoid

avoid

avoid electrical

electrical

electrical shock

shock

shock or

or damage

damage

damage to

to the

the

the meter,

meter,

do not

not

not get

get

get water

water

water inside

inside

inside the

the

the case.

case.

case. Remove

Remove

Remove the

the

the test

test

leads

leads and

and

and any

any

any input

input

input signals

signals

signals before

before

before opening

opening

opening the

the

case

Periodically wipe the case with a damp cloth and mild
detergent. Do not use abrasives or solvents.

Dirt or moisture in the terminals can affect readings.

To clean the terminals:

ℕ

Turn the meter off and remove all test leads.

ℕ

Shake out any dirt that may be in the terminals.

ℕ

Soak a new swab with a cleaning and oiling agent (such as

WD-40).

ℕ

Work the swab around in each terminal. The oiling agent

insulates the terminals from moisture-related contamination.

5.2

5.2 Fuse

Fuse

Fuse replacement

replacement

Before

Before replacing

replacing

replacing the

the

the fuse,

fuse,

fuse, disconnect

disconnect

disconnect test

test

test leads

leads

and/or

and/or any

any

any connectors

connectors

connectors from

from

from any

any

any circuit

circuit

circuit under

under

under test.

test.

To prevent

prevent

prevent damage

damage

damage or

or injury,

injury,

injury, replace

replace

replace the

the

the fuse

fuse

fuse only

only

with

with specified

specified

specified ratings.

ratings.

To replace the Meter's fuse (see Figure 2.):

1. Set rotary switch to the OFF position.

2. Disconnect test leads and/or any connectors from the

terminals.

3. Use a screwdriver to unscrew the two screws secured on

the battery cover.

4. Take out the battery cover from the meter.

5. Remove the fuse by gently prying one end loose, then

sliding the fuse out of its bracket.

6. Install the replacement fuses only with specified ratings:

F 10A/250V

∅

6.3

7. Rejoin the battery cover and secure by the two screws.

5.3

3 Battery

Battery

Battery replacement

replacement

To avoid

avoid

avoid false

false

false readings,

readings,

readings, which

which

which could

could

could lead

lead

lead to

possible

possible electric

electric

electric shock

shock

shock or

or personal

personal

personal injury,

injury,

injury, replace

replace

the

the battery

battery

battery as

as soon

soon

soon as

as the

the

the battery

battery

battery indicator

indicator

indicator ((((

))))

appears.

Before

Before replacing

replacing

replacing the

the

the battery,

battery,

battery, disconnect

disconnect

disconnect test

test

leads

leads and/or

and/or

and/or any

any

any connectors

connectors

connectors from

from

from any

any

any circuit

circuit

under

under test,

test,

test, turn

turn

turn the

the

the meter

meter

meter off

off

off and

and

and remove

remove

remove test

test

leads

leads from

from

from the

the

the input

input

input terminals.

terminals.

To replace the battery (see Figure 2.):

1. Set rotary switch to the OFF position.

2. Disconnect test leads and/or any connectors from the
terminals.

3. Use a screwdriver to unscrew the two screws secured on

the battery cover.

4. Take out the battery cover from the meter.
5. Remove the used batteries.
6. Replace with three new 1.5V batteries (AAA).

7. Rejoin the battery cover and secure by the two screws.

Summary of Contents for MS8268

Page 1: ...Mastech MS8268 HANDHELD DIGITAL MULTIMETER OPERATOR S INSTRUCTION MANUAL http www HisTest com ...

Page 2: ...aver 14 3 1 5 Relative measurement mode 14 3 2 Measurement Functions 15 3 2 1 AC and DC Voltage measurement 15 Ⅰ Table Table Table Table of of of of Contents Contents Contents Contents TITLE TITLE TITLE TITLE PAGE PAGE PAGE PAGE 3 2 2 Resistance measurement 16 3 2 3 Diode Test 17 3 2 4 Continuity Check 18 3 2 5 Transistor measurement 18 3 2 6 Capacitance measurement 19 3 2 7 Frequency and Duty Cyc...

Page 3: ...otected internal MAINS derived circuits In the latter case transient stresses are variable for that reason requires that the transient withstand capability of the equipment is made known to the user 1 When using this Multimeter the user must observe all normal safety rules concerning Protection against the dangers of electric current Protection of the Multimeter against misuse For your own safety ...

Page 4: ...ents on power switching circuits remember that high amplitude voltage pulses at the test points can damage the multimeter Use of a TV filter will attenuate any such pulses Use three 1 5V AAA batteries properly installed in the Meter s battery case to power the Meter 3 Replace the batteries as soon as the battery indicator appears With a low battery the Meter might produce false readings that can l...

Page 5: ...switched off If any faults or abnormalities are observed take the instrument out of service and ensure that it cannot be used until it has been checked out If the meter is not going to be used for a long time take out the battery and do not store the meter in high temperature or high humidity environment 1 2 1 2 1 2 1 2 Safety Safety Safety Safety mechanisms mechanisms mechanisms mechanisms Miscon...

Page 6: ...lay Display Symbols Symbols Symbols Symbols continued continued continued continued Symbol Symbol Symbol Symbol Meaning Meaning Meaning Meaning REL REL REL REL Indicator for the Relative measurement Indicator for the Diode Test mode hFE hFE hFE hFE Indicator for the transistor test mode Indicator for the Continuity Check mode Indicator for the Data Hold mode V V V V mV mV mV mV V mV Volts The unit...

Page 7: ...counter mode 9 Table Table Table Table 2 2 2 2 Keypad Keypad Keypad Keypad continued continued continued continued Key Key Key Key Function Function Function Function Operation Operation Operation Operation performed performed performed performed HOLD HOLD HOLD HOLD Any Any Any Any switch switch switch switch position position position position Press HOLD HOLD HOLD HOLD to enter and exit the Data ...

Page 8: ... and and and ranges ranges ranges ranges 1 The red lights at the V and COM terminals 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 terminals to warn the user At the same time the lights at the V and COM terminals will flash to remind the user to plug in the test leads there At At At At μ μ μ μA A A A mA mA mA mA and an...

Page 9: ...ging mode AUTO AUTO AUTO AUTO turns off Each presses of RANGE RANGE RANGE RANGE key increments the range When the highest range is reached the Meter wraps to the lowest range 13 NOTE If you manually change the measurement range after entering the Data Hold modes the Meter exits this mode 2 To exit the manual ranging mode press and hold down RANGE RANGE RANGE RANGE key for two seconds The Meter ret...

Page 10: ...d value The polarity of red test lead connection will be indicated when making a DCV measurement NOTE NOTE NOTE NOTE ℕ Unstable display may occur especially at 400mV range even though you do not put test leads into input terminals in this case if an erroneous reading is suspected short the V terminal and the COM terminal and make sure the zero display 15 ℕ For better accuracy when measuring the dc...

Page 11: ... a forward bias reading of 0 5V to 0 8V however the reverse bias reading can vary depending on the resistance of other pathways between the probe tips 3 2 4 3 2 4 3 2 4 3 2 4 Continuity Continuity Continuity Continuity Check Check Check Check To To To To avoid avoid avoid avoid electrical electrical electrical electrical shock shock shock shock and or and or and or and or damage damage damage dama...

Page 12: ...pacitance The measurement takes about 1 second per range The Meter s capacitance ranges are 4 000nF 40 00nF 400 0nF 4 000µF 40 00µF and 200 0µF 19 To measure capacitance 1 Set the rotary switch to range 2 Connect the black and red test leads to the COM COM COM COM and terminals respectively or you can measure the capacitance by using the special Multi Function Socket 3 Connect the test leads to th...

Page 13: ...or injury injury injury injury if if if if the the the the fuse fuse fuse fuse blows blows blows blows never never never never attempt attempt attempt attempt an an an an in circuit in circuit in circuit in circuit current current current current measurement measurement measurement measurement where where where where the the the the open circuit open circuit open circuit open circuit potential pot...

Page 14: ...re Coefficient 0 1 specified accuracy 18 or 28 ℕ MAX Voltage between terminals and earth ground 750V AC rms or 1000V DC ℕ Fuse Protection µA and mA Resettable fuse 400mA 250V 23 10A F 10A 250V 6 3 32 mm ℕ Sample Rate 3 times sec for digital data ℕ Display 3 3 4 digits LCD display Automatic indication of functions and symbols ℕ Range selection automatic and manual ℕ Over Range indication LCD will d...

Page 15: ...x 0 5V Overload protection 250Vdc or 250Vac rms 25 4 2 4 2 4 2 4 2 5 5 5 5 Diode Diode Diode Diode Range Resolution Function 1mV Display read approx forward voltage of diode Forward DC Current approx 1mA Reversed DC Voltage approx 1 5V Overload protection 250Vdc or 150Vac rms 4 4 4 4 2 2 2 2 6 6 6 6 Transistor Transistor Transistor Transistor Range Description Test Condition hFE Display read appro...

Page 16: ... current 400mA dc or 400mA ac rms for µA and mA ranges 27 4 2 4 2 4 2 4 2 9 9 9 9 DC DC DC DC CURRENT CURRENT CURRENT CURRENT Range Resolution Accuracy 400µA 0 1µA 1 2 of rdg 3 digits 4000µA 1µA 40mA 0 01mA 400mA 0 1mA 10A 10mA 2 0 of rdg 5 digits Overload protection F 10A 250V fuse for 10A range Resettable fuse F400mA 250V for µA and mA ranges Maximum input current 400mA dc or 400mA ac rms for µA...

Page 17: ... only with with with with specified specified specified specified ratings ratings ratings ratings To replace the Meter s fuse see Figure 2 1 Set rotary switch to the OFF position 29 2 Disconnect test leads and or any connectors from the terminals 3 Use a screwdriver to unscrew the two screws secured on the battery cover 4 Take out the battery cover from the meter 5 Remove the fuse by gently prying...

Page 18: ...use Replacemen Replacemen Replacemen Replacement t t t CAUTION CAUTION CAUTION CAUTION Using this appliance in an environment with a strong radiated radio frequency electromagnetic field9approximately 3V m may influence its measuring accuracy The measuring result can be strongly deviating from the actual value 31 ...

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