Mastech MS8239A Manuale utente

MS8239A

User's Manual

Digital Multimeter

HOLD

10A

COM

MAX

10A/ 500V

MAX

200mA/250V

600V MAX

600V CAT III

IEC61010-1

BATT.

200

600

20m

200m 10A

200

20k

200k

200

600

200m

1.5V

12V

MS8239A

Auto Power Off

DIGITAL MULTIMETER

CONTENTS

Safety Indicators..............................1

CONTENTS

Meter Appearance..............................5

Safe Working Habits..........................2

Overview..........................................1

Electric Symbols...............................4

Meter Instructions.............................5

Display..............................................5

Measuring Operation.........................7

Data Hold

DC/AC Voltage Measurement.............7

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

DC Current Measurement

Resistance Measurement

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

...................9

Continuity Measurement...................10

Diode Test........................................10

Battery Test......................................11

General Specifications.......................11

Accuracy Indicators...........................12

DC Voltage..........................................13

AC Voltage..........................................13

Resistance Measurement.....................14

Diode..................................................14

Continuity Measurement.......................14

DC Current..........................................15

Battery Test.........................................15

Maintenance.....................................15

General Maintenance...........................16

Replace Battery...................................16

Replace Fuse.......................................17

Overview Safe Working Habits

To avoid electric shock or personal injury, please

read “safety information” and “warning and

related notes” carefully before using the meter.

The MS8239A is a small hand-held, safe and reliable

3.5” digital multimeter with stable performance and

novel structure. It can be used to measure DC

voltage, DC current, resistance, diode forward

voltage drop, circuit continuity and to test batteries.

It is an ideal maintenance tool easily carried by a

large number of users.

Warning To avoid possible electric shock or personal injury as

well as damage to the meter or measured objects,

please use the meter according to the following

procedures:

Safety Instructions

The MS8239A digital multimeter has been designed

according to International Electro Safety Standard

IEC-1010 (61010-1@IEC: 2001) concerning safety

requirements for electronic measuring instruments

and hand-held digital multimeters. It meets the

requirements for CAT.III 600V of IEC1010 and grade

2 for pollution.

• Users should use the meter strictly according to

the provisions of this manual. Otherwise, the

warranty for the meter may become invalid.

• The warnings in the user manual are used to remind

users of possible dangers or dangerous actions.

• The notes in the user manual are to remind users

of conditions or actions that may cause damage

to the measured object.

• Check the case before using the meter. Don't use the

meter with damaged case. Check to see if the case is

cracked or lacks plastic parts. Please pay special

attention to the joint insulating layer.

• Check to see if the test wire has insulation damage or

bare metal. Check test wire continuity. If the wire is

damaged, please replace it with a new one before

using the meter.

• Measure known voltage with the meter to verify that

the meter is working properly. If the meter is working

abnormally, stop using it immediately. A protective

device may be damaged. If there is any doubt, please

have the meter inspected by a qualified technician.

• Do not test voltage exceeding rated voltage marked

on the meter.

• When testing voltage exceeding 30v AC voltage RMS,

42v AC peak or 60v DC, be particularly careful to

avoid electric shock.

• When measuring, use correct jack, and select the

proper function and measuring range.

• Do not use the meter in explosive gas, vapor or dusty

environments.

• When using the probe, fingers should be behind the

probe protection device.

• When connecting circuits, connect the common test

line first, then connect the charged test line. When

disconnecting circuits, disconnect the charged test

line first, then disconnect the common test line.

Before measuring resistance, continuity, and diodes,

first turn off power and discharge all high voltage

capacitors.

• If the meter is not used in accordance with the

instructions, the meter's safety protective function

may become invalid.

• For all DC measurements, to avoid the risk of

electric shock, please use AC function to verify the

existence of any AC voltage. Then, select DC

voltage measuring range equal to or greater than

the AC measuring range.

• Before measuring current, please check the meter

fuse, shut off power to the circuit to be tested, then

connect the meter and energize the circuit.

• When opening the case (or part of the case), turn

the meter off.

• When the battery low voltage indicator “ ”

becomes lit, replace the battery at once. A low

battery will cause meter reading errors and may

result in electric shock or personal injury.

• Before opening the case or the battery cover,

remove the test wire from the meter.

When maintaining the meter, use replacement parts

specified by the factory.

Electric Symbols

Important safety information

AC (Alternating Current)

DC (Direct Current)

AC or DC

Ground wire

Fuse

Accord with the related EU laws and regulations

(1) LCD display

(2) Data hold key

(3) Function selection rotary switch

(4) Positive input jack of 10A (connected with the

red test probe).

(5) All the common input jacks for measuring

(connected with the black test probe).

(6) Positive input jack of voltage, resistance, mA

current, diode, continuity and battery test

(connected with the red test probe).

Meter Instructions

Meter Appearance

Display

(1) Battery low voltage indicator

(2) Data hold indicator

(3) Numerical value display

(4) Numerical value polarity indicator (negative sign)

HOLD

10A

COM

MAX

10A/ 500V

MAX

200mA/250V

600V MAX

600V CAT III

IEC61010-1

BATT.

200

600

20m

200m 10A

200

20k

200k

200

600

200m

1.5V

12V

MS8239A

Auto Power Off

DIGITAL MULTIMETER

Measuring Operation DC Current Measurement:

Data Hold

The data hold function can keep the current readings

on the display. To enter and exit reading maintenance

mode:

Press the “HOLD” key, the reading will be stored

and “H” symbol will display on the LCD display.

Press the “HOLD” key again to return the meter

to the normal measurement state.

AC/DC Voltage Measurement:

Rotate the function selection switch to appropriate

AC or DC voltage measurement position.

Connect the black and red test probes to the COM

input jack and VΩmA input jack, respectively..

Measure the voltage of circuit to be tested with

other ends of test probes (connected with the

circuit to be tested in parallel).

Read the measured value from the LCD display.

When measuring the DC voltage, the display will

simultaneously show the voltage polarity which is

connected with the red test probe.

Don't measure any RMS voltage higher than 600V

DC or AC, to prevent injury or damage to meter

and equipment.

Warning

Turn off the power to the circuit to be tested.

Discharge all the high voltage capacitors on the

circuit to be tested.

Rotate the function selection switch to the

appropriate DC current position.

Depending on the size of the current to be

measured, connect the red test probe to 10A or mA

input jack; connect the black test probe to COM

input jack.

Turn off the circuit to be tested. Connect the black

test probe to one end of the disconnected circuit

(low voltage relatively), and the red test probe is

connected to the other end of disconnected circuit

(high voltage relatively). (Reversing test probes

would make reading become negative, but the

meter won't be damaged.)

Connect the power supply to the circuit, then read

the display reading. If the display shows only “1”,

the input is out of the selected input range. In this

case, rotate the switch to a higher measuring range.

To prevent injury or damage to meter and

equipment, do not make current measurements

if voltage exceeds 250V.

Warning

Before measuring current, first check the meter's

fuse. When measuring, use correct input end and

function. When the test probe is inserted to the

current input end, don't connect the other end of

the test probe with any circuit in parallel.

Note

Resistance Measurement:

Rotate the function selection switch to an

appropriate resistance position, and turn off the

power to the circuit to be tested

Connect the black and red test probe to COM

input jack and VΩmA input jack, respectively.

Measure the resistance of the circuit with other

ends of test probes.

Read the resistance value from the LCD display.

Here are some tips for measuring resistance:

• The resistance measured on a circuit is usually

different from the rated value of resistance. This is

because the test current of the meter will flow

through all the possible channels between the

test probes.

• When measuring low resistance, to ensure the

accuracy of the measurement, make a short circuit

between the test probes and read the resistance

value of the short circuit. This resistance value

should be subtracted after measuring the

resistance to be tested.

• When there is no input (for example, open circuit),

the display will show “1”, which means that the

measured value is out of range.

When measuring resistance or circuit continuity,

to avoid injury or meter damage, turn off the power

to the circuit and discharge all capacitors.

Warning

Continuity Measurement:

Rotate the function selection switch to continuity

measurement position, and turn off the power to

the circuit to be tested

Connect the black and red test probe to COM input

jack and VΩmA input jack, respectively.

Measure the circuit to be tested with other two ends

of the test probes.

If the measured circuit resistance is less than

about 50Ω, the buzzer will sound continuously.

When measuring resistance or circuit continuity,

to avoid injury or meter damage, turn off the power

to the circuit and discharge all capacitors

Diode Test:

Warning

Rotate the function selection switch to diode

position, and turn off the power to the circuit to

be tested

Connect the black and red test probe to COM input

jack and VΩmA input jack, respectively.

Connect the black and red test probe to cathode

and anode of the diode to be tested, respectively.

The meter will display the diode's forward bias

voltage value. If the test probe polarity is reversed,

the meter will display “1”, which distinguishes the

diode's cathode and anode.

When measuring diodes, to avoid injury or meter

damage, turn off the power to the circuit and

discharge all capacitors.

Warning

Battery test

Place the function measuring range switch to the

battery testing position.

Insert the red probe to VΩmA input jack. Insert the

black probe to COM input jack.

Connect free end of the red probe to positive and

the free end of the black probe to negative end of

the battery to be tested.

Read the result from the LCD display.

Don't input voltage higher than 60V DC or 30V AC,

to prevent electric shock or meter damage.

General specifications

Warning

• Operating environment and condition: 600V

CAT. III, pollution grade: II.

Elevation < 2000 m

• Environmental temperature and humidity: 0~40°C,

<80% RH (do not use meter when temperature <10°C).

• Storage temperature and humidity: -10~60°C and

<70% RH (remove the battery).

• Temperature coefficient: 0.1 Accuracy /°C(<18°C

or >28°C).

• The maximum allowable voltage between

measurement end and ground: 600V DC or 600V

AC RMS.

• Fuse protection: grade mA: fuse F200mA/500V

grade 10A: fuse F10A/500V

• Sampling rate: about 3 times/s.

• Display: 3.5” digital LCD display.

• Over-range indication: LCD will show “1”.

• Low battery indication: When the battery voltage is

lower than the normal operating voltage, “ ”will

display on the LCD display.

• Input polarity indication: automatically display “-”.

• Power supply: AAA 1.5V batteries.

Accuracy Indicators

Accuracy: ±(% of reading + digits) with one year of

warranty. Reference conditions: environmental

temperature is from 18°C~28°C, relative humidity is

not more than 80%.

Resolution Accuracy

200mV

0.1V

0.001V

0.1mV

0.01V

DC Voltage

20V

200V

600V ±(0.8% of reading +3 digits)

Input impedance: 1MΩ

Maximum input voltage: 600V DC or AC RMS, 250V DC

or AC RMS with the measuring range of 200mV.

Resistance

Measuring range

±(0.5% of reading +3 digits)

Resolution Accuracy

200V

600V 1V

0.1V

AC Voltage

Input impedance: 1MΩ

Maximum input voltage: 600V DC or AC RMS, 250V DC

or AC RMS with the measuring range of 200mV.

Frequency response: 40Hz~400Hz, sine wave RMS

(average response)

Measuring range

±(1.2% of reading +10 digits)

Resolution Accuracy

200Ω

2kΩ

0.1kΩ

0.001kΩ

0.1Ω

0.01kΩ

0.001MΩ

20kΩ

200kΩ

2MΩ

Measuring range

±(0.8% of reading +5 digits)

Overload protection: 250V DC or AC (RMS)

Forward DC current:

about 1mA; Reverse

DC voltage: about

2.5V. Display

approximation of

diode forward

voltage drop.

Diode

Measuring

range

Function Test EnvironmentResolution

0.001V

Diode Test

Overload protection: 250V DC or AC (RMS)

When built-in buzzer

sounds, the resistance

to be tested is less than

about 60Ω.

Continuity Measurement

Function Test Environment

Description

Open circuit voltage:

about 2.5V

Overload protection: 250V DC or AC (RMS)

Direct Current

Resolution Accuracy

20mA

200mA 0.1mA

0.01mA

10mA10A

Measuring range

±(1.0% of reading +5 digits)

Overload protection: grade mA: Fuse (F200mA/600V)

protection; grade 10A: Fuse (F10A/500V) protection.

Maximum input current: grade mA: 200mA DC or AC

RMS; grade 10A: 10A DC or AC RMS

When measured current is greater than 2A, the

continuous measurement time cannot be not more

than 2 minutes. Disconnect the current and wait 10

minutes before making another measurement.

±(2.0% of reading +10digits)

Battery Test

Resolution Built-in load resistance

12V

9V 0.01V

0.01V

0.001V1.5V

Measuring range

300Ω

1.8kΩ

36Ω

Overload protection: Fuse (F200mA/500V) protection;

Maintenance

This section provides basic maintenance information,

including instructions for the replacement of fuse and

battery. Do not try to repair the meter unless you are

an experienced maintenance person with the relevant

calibration, performance testing and maintenance data.

To avoid injury or damage to the meter, don't wet

the inner parts of the meter. Before opening the

case or battery cover, remove the connecting

cable between the test probe and the input signal.

Warning

General Maintenance

Regularly clean the meter case with damp cloth and

a small amount of detergent. Do not use abrasives or

chemical solvents. If the input jack becomes dirty or

wet, it may affect the measurement readings.

To clean input socket:

Turn off the meter and pull out all the test probes

from the input jack.

Remove all dirt from the jacks.

Apply detergent or lubricant to a new cotton ball

(such as WD-40).

Clean each jack with a cotton ball and lubricant to

prevent contamination by moisture in the socket.

Replace Battery

To avoid incorrect readings and possible electric

shock or personal injury, when “ ” appears on

the meter display, replace the battery immediately.

To avoid electric shock or personal injury, before

opening the battery cover to replace battery, turn

off the meter and make sure that the test probe is

disconnected from the measurement circuit.

Warning

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