Mastech MS8235 Manual de usuario

MS8235

DIGITAL CLAMP METER

OPERATION MANUAL

MS8235

DIGITAL MULTIMETER + LAN Teter

2 in 1 2000 counts /Autorange

FUNC

RANGE

MAX HOLD

TEST

Hz µA

Net

Cable

NCV

OFF

IEC61010-1

600V CAT III

10A HzµAmA

VΩ

COM

MAX 600V MAX

10A/500V~ MAX 200mA/1000V~

1.1 Preliminary

1.2 Dos And Don’ts.....................................2

1.3 Symbols...............................................3

CONTENTS CONTENTS

1. Safety Information............................1

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

........6

................................................7

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

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

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

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

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

1.4 Precautions...........................................3

2. Description.......................................

2.1 Names OF Parts...................................5

2.2 Switches, Buttons And Input Jacks

2.3 Display

3. Specifications...................................8

4. Operation Instructions

...............................................8

3.1 General

4.1 Function Switching

4.2 Switching Range

4.3 Maximum Value Measurement

4.4 Reading Holding..................................13

4.5 Backlight Source

4.6 Use Of The Test Key............................14

4.7 Preparation For Measurement..............14

4.8 Measurement Of DC Voltage.....................15

4.9 Measurement Of AC Voltage.......................16

4.10 Diode Test

4.11 Circuit Continuity Test

4.12 Resistance Measurement

4.13 Measurement Of DC Current

...............................................17

.............................17

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

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

...................20

....................21

...............23

4.15 Frequency Measurement.........................21

4.16 Network Cable Integrity Test

4.17 Non-Contact Voltage Detection

4.18 Operating Precautions Of

Protective Cover...................................24

4.19 Automatic Power Off...............................25

5. Maintenance......................................26

.........................26

5.1 Replacement Of Batteries

5.2 Replacement Of Fuse...............................27

6. Accessories.......................................28

4.14 Measurement Of AC Current

5.3 Replacement Of Test Probes.....................28

3.2 Technical Index.....................................9

1. Safety Information

The Auto Range Digital Multimeter (hereinafter referred

to as“ the meter ”) complies with the safety requirements

for electronic measuring instruments in IEC-61010-1,

falls into pollution degree 2 and meets the over-voltage

standard of CAT ΙΙΙ 600V.

Follow all safety and operation instructions to ensure safe

use of the meter.

With proper use and care, the meter will give you years of

satisfactory service.

1.1 Preliminary

1.1.1 To operate the meter, the user must observe the

following normal safety rules:

1) General protection against electric shock; and

2) Protection of the meter against misuse

1.1.2 When the meter is received, please check whether

it has been damaged during transport.

1.1.3 After being stored and delivered under harsh

conditions, the meter should be checked and

confirmed for damage.

1.2 Dos And Don’ts

1.2.1 Use the right input jack, function and range.

1.2.2 Do not take measurements beyond the protection

limits indicated in the specifications.

1.2.3 Do not touch the metal tips of the test probes when

connecting the meter to the circuit to be measured.

1.2.4 Keep your fingers behind the probe barriers when

taking a measurement with an effective voltage of

above 60V DC or 30V AC.

1.2.5 Do not take any voltage measurement if the value

between the measuring terminal and the ground

exceeds 1000V.

1.2.6 Select the highest range if the value to be

measured in the manual range is unknown.

1.2.7 Do not connect the meter to any voltage source

while the meter is in the current, resistance, diode

or continuity test range.

1.2.8 Disconnect the test probes from the circuit under

test before turning the range selector to change

functions.

1.2.9 Be careful that high voltage pulses at the test point

may damage the meter when measurements are

being taken on the switching power circuit of a

TV set.

1.2.10 Do not measure the resistance, diode or

continuity of live circuits.

BE EXTREMELY CAREFUL WHEN USING THE METER.

Improper use of this device can result in electric

shock or destruction of the meter. Take all normal

safety precautions and follow the safeguards

suggested in this manual.

To exploit full functionality of the meter and ensure

safe operation, Protection provided by the instrument

will be impaired if used in a manner not specified by

the manufacturer.

WARNING

1.1.4 The test probes must be kept in good condition.

Check whether the insulation of the test probes

has been damaged and whether any wire has

been exposed.

1.1.5 Using the test probes supplied can ensure safety.

If required, they must be replaced with those of

the same model or class

03 0 4

1.4 Precautions

1.4.1 Do not adjust or repair the meter by attempting to

remove the rear case. Such operation should only

be performed by a technician who fully understands

the meter and the electric shock risk involved.

1.4.2 Remove the test probes from the circuit under test

before opening the battery cover of the meter.

1.4.3 To avoid any electric shock caused by erroneous

readings, replace the batteries immediately when

1.2.11 Do not use the meter near explosive gases,

steam or dirt.

1.2.12 Stop using the meter if any abnormalities or

faults are noticed.

1.2.13 Do not use the meter unless its rear case is

securely fastened in its original position.

1.2.14 Do not store or use the meter in areas exposed

to direct sunlight, high temperatures or high

humidity.

1.3 Symbols

Important safety information; refer to the operation

manual

Dangerous voltage may be present.

CAT III – over-voltage (installation) category III, pollution

degree 2 per IEC61010-1, referring to the level of impulse

withstand voltage protection provided.

Compliance with European Union (EU) directives

Ground

Double insulation (protection class II)

Fuse

the“ ” symbol appears on the LCD.

1.4.4 To avoid fire hazards, the replacement fuse must

meet the specified voltage and current ratings of F

10A/500V and F200mA/1000V (quick acting).

1.4.5 Use wet cloth and mild detergent to clean the

meter; do not use abrasives or solvents.

1.4.6 Turn to OFF switch off the power when is not in use.

1.4.7 Remove the batteries to avoid damages to the

meter if it will idle for a long time.

1.4.8 Using this appliance in an environment with a

strong radiated radio-frequency electromagnetic

field (approximately 3V/m ),may influence its

measuring accuracy. The measuring resul can be

strongly deviating from the actual value.

2. Description

- The meter is a portable specialized measuring

instrument with a large digital LCD, as well as a

backlight source for easy reading. The range selector

designed for single-hand operation makes

measurement easy. Overload protection and low

battery indication are provided. It is an ideal

multi-functional instrument with scores of practical

applications for professional, factory, school, amateur

and home use.

- The meter can be used to measure DC and AC voltages

and currents, and resistances, test circuit continuity

and diodes, detect phone line mode, judge break points

in cable lines, track the routing of cable lines, and detect

network cable integrity and non-contact voltage.

- The meter is provided with both automatic/manual

ranges.

- The meter is provided with the automatic shutdown

function.

05 0 6

- The meter is provided with the reading hold function.

- The meter is provided with the maximum measurement

- The meter is provided with low battery voltage indication.

2.1 Names Of Parts

1)Non-contact voltage detection indicator light

2)LCD (liquid crystal display)

3)Data hold (HOLD)

4)Maximum measurement (MAX)

5)Range switch button (RANGE)

6)Function switch button (FUNC)

7)Backlight key

8)Test key

9)Panel

10) Rotary selector

11)mA/μA/V/Ωjack

12) COM jack

13) 10A jack

14) Guard plate

2.2 Switch, Buttons And Input Jacks

HOLD key

MAX key

RANGE key For switching between auto and

manual ranges

FUNC key For switching among measuring functions

Backlight key

TEST key For measurement

10A jack Input jack for 10A current range

mA/ A/V/

jack and diode measurement

COM jack Common terminal

For reading holding

μ Ω/

For maximum measurement

For switching on/off the backlight

For mA/μA current, voltage, resistance

MS8235

DIGITAL MULTIMETER + LAN Teter

2 in 1 2000 counts /Autorange

FUNC

RANGE

MAX HOLD

TEST

Hz µA

Net

Cable

NCV

OFF

IEC61010-1

600V CAT III

10A HzµAmA

VΩ

COM

MAX 600V MAX

10A/500V~ MAX 200mA/1000V~

07 0 8

2.3 Display

AC (alternating current)

DC (direct current)

Auto range

AUTO

Ohms (Resistance)

LCD diagram

V Volts (Voltage)

A Amperes (Current)

μ,m,

k, M Hertz (Frequency)

Symbols of units: micro, milli, kilo and million

Continuity buzzer

Diode measurement

MAX Maximum measurement

H Reading being held

Low battery

Phone standby

Phone ringing

Phone pick-up

The RING line is clamped by the red clip

The TIP line is clamped by the red clip

① — ② Cable pair 1-2

③ — ⑥ Cable pair 3-6

④ — ⑤ Cable pair 4-5

⑦ — ⑧ Cable pair 7-8

SHIELD Cable shield

OPEN Open circuit

SHORT Short circuit

REVERSED Reverse connection

MISWIRE Miswiring

SPLIT PAIRS Split pair

Audio signal

3. Specifications

3.1 General

3.1.1 Auto range and manual range options are available.

3.1.2 Overload protection is available for all ranges.

3.1.3 Display: LCD.

3.1.4 Maximum value display: 1999 digits.

3.1.5 Polarity indication: automatic; ‘---‘ for negative

polarity.

3.1.6 Over-range indication: ‘0L’ or ‘---0L’.

3.1.7 Unit indication: function and energy unit indication.

3.1.8 Judging the ringing, standby or pick-up mode of

the phone line.

3.1.9 Judging any breakpoint in the cable line, and

tracking the routing of the cable line.

09 1 0

3.1.10 Detecting network cable integrity, judging open

circuit, short circuit, miswiring, split pair and

reverse connection of the network cable, and

shield integrity, and displaying abnormity

symbols.

3.1.11 Non-contact voltage detection.

3.1.12 Automatic power off time: 15 min

3.1.13 Fuse specification: F10A/500V, F200mA/1000V

(quick acting)

3.1.14 Battery under-voltage indication: The LCD

displays the“ ” symbol.

3.1.15 Operating power: 6F22 9V batteries

3.1.16Operating temperature: 0°C~40°C

3.1.17Storage temperature:-10°C~50°C

3.1.18Dimensions:195×92×55mm

3.1.19Weight:about 400g(including batteries)

3.2 Technical Index

3.2.1 DC Voltage

Accuracy

Resolution

0.1mV

Range

200mV

± (0.5% of reading + 5 digits)

20V

200V

1000V

1mV

0.1V

0.01V

± (0.8% of reading + 5 digits)

-Max. input voltage: 1000V DC

Note:

At the low voltage range, unsteady readings will appear

before the test probes contact the circuit. This is normal

because the meter is highly sensitive. When the test

probes contact the circuit, the true reading will

be displayed.

3.2.2 AC Voltage

Accuracy

Resolution

0.1mV

Range

200mV

20V

200V

750V

1mV

0.1V

0.01V ± (0.8% of reading + 5 digits)

- Max. input voltage: 750V AC

- Frequency range: 40~400Hz

- Response: average (rms of sine wave)

Note:

At the low voltage range, unsteady readings will appear

before the test probes contact the circuit. This is normal

because the meter is highly sensitive. When the test

probes contact the circuit, the true reading will

be displayed.

11 1 2

3.2.3 Resistance

Accuracy

Resolution

0.1Ω

Range

200Ω

20KΩ

200KΩ

0.001KΩ

±(1.0% of reading + 5 digits)

2KΩ

2MΩ

20MΩ

0.01KΩ

0.1KΩ

0.001MΩ

0.01MΩ

3.2.4 Diode Test

Function

Resolution

1mV

Range

Displaying approximate

forward voltage of diode

3.2.5 Short-Circuit Test

Function

Resolution

0.1Ω

Range

Giving an alarm if the

resistance is less than 70Ω

3.2.6 DC Current

Accuracy

Resolution

Range

± (2.0% of reading + 5 digits)

±(1.2% of reading + 5 digits)

200μA

2000μA

20mA

200mA

20A

0.1μA

1μA

0.01mA

0.1mA

0.001A

0.01A

- Overload protection:

μA, mA range: fuse 200mA/1000V (quick acting)

10A range: fuse 10A/500V (quick acting)

- Max. input current: μA/mA jack (μA range): 2000uA

μA/mA jack (mA range): 200mA

10A jack: 10A

3.2.7 AC Current

Accuracy

Resolution

Range

± (3.0% of reading + 5 digits)

±(1.5% of reading + 5 digits)

200μA

2000μA

20mA

200mA

20A

0.1μA

1μA

0.01mA

0.1mA

0.001A

0.01A

- Overload protection:

μA, mA range: fuse 200mA/1000V (quick acting)

10A range: fuse 10A/500V (quick acting)

- Max. input current: μA/mA jack (μA range): 2000uA

μA/mA jack (mA range): 200mA

10A jack: 10A

Frequency range: 40~400Hz

Response: average (rms of sine wave)

3.2.8 Frequency

Function

Resolution

10Hz

Range

20kHz ±(1.5% of reading + 5 digits)

13 1 4

4. Operating Instructions

4.1 Function Switching

1) Press the "FUNC" key to switch between AC and DC

measurement at the current ranges.

2) Press the "FUNC" key to switch between the diode and

continuity ranges.

4.2 Range Switching

1) When the meter is turned on, it is at the auto range for

measuring current, voltage and resistance.

2) Press the "RANGE" key to enter the manual range

mode. The range will go one level up with each press

and return to the lowest level when the highest level

is reached.

3) Hold the “RANGE” key for more than 2 seconds to

return to the auto range.

4.3 Maximum Value Measurement

1) The maximum value measurement function can be

used when the meter is measuring current and voltage.

2) To display the measured maximum value during

measurement, press the “MAX” key, and the

measured maximum value will appear on the LCD.

3) Press the “MAX” key again to release the maximum

value measurement function.

4.4 Reading Holding

1) To hold the reading during measurement, press the

“HOLD” key, and the displayed value on the LCD

will be locked.

2) Press the “HOLD” key again to release the reading

holding mode.

4.5 Backlight Source

1) If the environment is too dark for reading during

measurement, hold on to the " " key for more than

2 seconds to turn on the backlight source.

2) Hold on to the " " key again for more than

2 seconds to turn off the backlight source.

3) After the backlight source is turned on, if the " "

key is not held down for more than 2 seconds, the

backlight source will shut down automatically 15

seconds later.

4.6 Use Of The Test Key

1) Press "TEST" to start detection when the meter is at

the Phone (phone line mode detection), Tone

(judgment and tracking of cable line), Net Cable

(network cable integrity detection) range.

2) After the detection, the detection result indicator will

flash. Press the "TEST" key to stop flashing and get

ready for the next detection.

4.7 Preparation For Measurement

1) Turn the range selector and turn on the power. If the

battery voltage is low (about ≤7.2V), the LCD will

display the “ ” symbol, when the batteries must

be replaced.

2) The “ ” symbol beside the input line indicates that

the input voltage or current should not exceed the

indicated value. This is intended to protect the

internal circuit from damage.

3) Set the range selector to the desired measurement

function and range. In the manual range mode, if the

scale of the measured value is unknown beforehand,

the highest range should be set.

15 1 6

4) Connect the common test wire and then the live test

wire during connection. Remove the live test wire

first during disconnection.

4.8 Measurement Of DC Voltage

WARNING

There is the risk of electric shock.

Pay special attention to avoid electric shock

when measuring high voltages.

Do not input any voltage of over DC1000V,

which may damage the internal circuit though

a higher voltage may be displayed.

4.8.1 Plug the black probe into the COM jack and the red

probe into the V jack.

4.8.2 press the “RANGE” key to select the auto or manual.

4.8.3 Connect the test probes to the voltage source or load

in parallel for measurement.

4.8.4 Take a reading in the main display area of the LCD.

The polarity indication will show the polarity of the

terminal connected by the red probe.

Note:

1) At the low voltage range, unsteady readings will appear

before the test probes contact the circuit. This is normal

because the meter is highly sensitive. When the test

probes contact the circuit, the true reading will be

displayed.

2) In the manual range mode, if the LCD displays “O L”

or “-O L” only, it means the measurement has exceeded

the range and a higher range should be selected.

3) In the manual range mode, if the scale of the measured

value is unknown beforehand, the highest range should

be set and then lowered down gradually.

4.9 Measurement Of AC Voltage

WARNING

There is the risk of electric shock.

Pay special attention to avoid electric shock

when measuring high voltages.

Do not input any voltage of over AC750V rms,

which may damage the internal circuit though

a higher voltage may be displayed.

4.9.1 Plug the black probe into the COM jack and the red

probe into the V jack.

4.9.2 Set the range selector to the V range position.

4.9.3 Press the “RANGE” key to select the auto or manual

mode.

4.9.4 Connect the test probes to the voltage source or load

in parallel for measurement.

4.9.5 Take a reading in the main display area of the LCD.

Note:

1) At the low voltage range, unsteady readings will appear

before the test probes contact the circuit. This is normal

because the meter is highly sensitive. When the test

probes contact the circuit, the true reading will be

displayed.

2) In the manual range mode, if the LCD displays ‘O L’ only,

it means the measurement has exceeded the range and

a higher range should be selected.

3) In the manual range mode, if the scale of the measured

value is unknown beforehand, the highest range should

be set and then lowered down gradually.

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