Mastech MS8239C Manual de usuario

MS8239C

User's Manual

Digital Multimeter

600V CAT III

IEC61010-1

10A

COM

10A

FUSED

400mA

FUSED

600V MAX

MS8239C

kHz

mVA

AUTO MAX

Autorange

DIGITAL MULTIMETER

FUNC HOLD Hz%

Hz%

mAµAV

°C°FHzΩ

CONTENTS

Safety Instructions............................1

CONTENTS

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

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

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

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

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

Display..............................................6

Measuring Operation.........................8

DC/AC Voltage Measurement.............8

DC/AC Current Measurement

Resistance Measurement

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

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

Continuity Measurement..................12

Capacitance Measurement................11

General Specifications........................14

Accuracy Indicators............................15

DC Voltage...........................................15

AC Voltage...........................................16

Resistance...........................................16

Capacitance.........................................17

Diode/Continuity Measurement.............17

DC Current...........................................18

AC Current...........................................18

Maintenance......................................19

General Maintenance............................19

Replace Battery....................................20

Replace Fuse.......................................21

Keys Operation.................................7

Automatic Power-Off Function...........7

Diode Test.......................................12

Frequency/Duty

Ratio Measurement...........................13

Temperature Measurement....................14

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 MS8239C is a small hand-held, safe and reliable

3.5” digital auto measuring range multi-meter with

stable performance and novel structure. It can be

used to measure DC voltage, AC/DC current,

resistance, capacitance, frequency, duty ratio,

temperature, diode forward voltage drop and circuit

continuity. 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 methods:

Safety Instructions

The MS8239C digital multi-meter 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 multi-meters. 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 danger or dangerous action.

• The notes in the user manual are used to remind

users of possible meter damage or condition or

action of 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

Double insulation protection

Fuse

Accord with the related EU laws and regulations

(8) All common input jacks for measuring (connected

with the black test probe).

(9) Positive input jack of voltage, resistance,

capacitance, temperature, frequency, mA

current, diode and continuity (connected with the

red test probe)

Meter Instructions

Meter Appearance

Display

(1) Alternating current indicator

(2) Numerical value polarity indicator (negative sign)

(3) Direct current indicator

(4) Automatic measuring range indicator

(5) Diode measurement function indicator

(6) Continuity measurement indicator

(7) Data hold indicator

(8) Measurement display value

(9) Battery low-voltage indicator

(10) Measurement unit

(1) LCD display

(2) Backlight key

(3) Frequency/duty ratio key

(4) Function selection key

(5) Data hold key

(6) Function selection switch

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

red test probe)

kHz

mVA

AUTO MAX

967

600V CAT III

IEC61010-1

10A

COM

10A

FUSED

400mA

FUSED

600V MAX

MS8239C

kHz

mVA

AUTO MAX

Autorange

DIGITAL MULTIMETER

FUNC HOLD Hz%

Hz%

mAµAV

°C°FHzΩ

Keys Operation

“FUNC” key:

Function selection key, switch measurement function

by pressing “FUNC” key, combined with switch

“HOLD” key:

Data hold key, press “HOLD” key; the reading will be

locked and “HOLD” symbol will display on LCD

display. Press “HOLD” key again to revert to normal

measurement state.

“Hz/%” key:

Frequency/duty ratio selection key. At frequency

position, pressing this key can select frequency or

duty ratio measurement, AC/DC voltage or AC/DC

current position. Pressing this key can select

voltage/frequency/duty ratio or current/frequency

/duty ratio measurement mode.

“ ”key:

Backlight switch key. Press “ ”key and hold for

2sec., turn on backlight; press this key when the

backlight is on to turn off the backlight.

Measuring Operation

AC/DC Voltage Measurement:

Rotate function selection switch to voltage

measurement position.

Press “FUNC” key to select AC or DC voltage

Connect black and red test probe to 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 LCD display. When

measuring DC voltage, the display will

simultaneously show the voltage polarity which is

connected with red test probe.

Automatic Power-Off Function

In the measurement process, if there is no activity

by the function key or function selection switch for

30 minutes, the meter will automatically shutdown

(sleep state). Hold “FUNC” key to power on and the

automatic shutdown function will be cancelled.

Don't measure any RMS voltage higher than 600V

DC or AC, to prevent injury or damage to meter

and equipment.

Warning

AC/DC Current Measurement:

Turn off the power to the circuit to be tested.

Discharge all high voltage capacitors on the circuit

to be tested.

Rotate function selection switch to appropriate

current position.

Press “FUNC” key to select AC or DC current.

Depending on the size of the current to be measured,

connect the red test probe to 10A or VΩmA input

jack and connect the black test probe to COM input jack.

Turn off the circuit to be tested. The black test

probe is connected to one end of disconnected

circuit (low voltage relatively), and the red test

probe is connected to the other end of disconnected

circuit (high voltage relatively). (When measuring

direct current, connecting test probe reversely

would make reading become negative, but the

meter won't be damaged.)

Connect the power to the circuit, then read the

display reading. If it is overload, “OL” will display

on the LCD display.

To prevent injury or damage to meter and

equipment, do not make current measurements

if voltage exceeds 600V.

Note

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

Warning

Resistance measurement:

Rotate function selection switch to resistance

measurement position, and turn off the power to

the circuit to be tested

If needed, press “FUNC” key to select resistance

measurement function

Connect black and red test probe to COM input

jack and VΩmA input jack, respectively.

Measure the resistance of circuit to be tested with

other ends of test probes.

Read the resistance value from LCD display. If it

is overload, “OL” will display on 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 possible channels between test probes.

• When measuring low resistance, to ensure accuracy,

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 “OL”, 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

Capacitance Measurement:

Rotate function selection switch to capacitance

measurement position, and turn off the power to

the circuit to be tested

If needed, press “FUNC” key to select capacitance

measurement function

Connect black and red test probe to COM input jack

and VΩmA input jack, respectively.

Measure the capacitance of circuit to be tested with

other two ends of test probes.

Read the capacitance measuring value from LCD

display. If it is overload, “OL” will display on the

LCD display

Here are some tips for measuring capacitance:

• When measuring bulk capacitors with this meter,

readings will stabilize after a few seconds..

• To improve the accuracy below 20nF, subtract the

distributed capacitance of meter and cable.

When measuring capacitance, to avoid injury or

meter damage, turn off the power to the circuit to

be measured discharge all capacitors

Warning

Continuity Measurement:

Rotate function selection switch to continuity

measurement position, and turn off the power to

the circuit to be tested

If needed, press “FUNC” key to select continuity

measurement function

Connect black and red test probe to COM input

jack and VΩmA input jack, respectively.

Measure the circuit to be tested with other ends

of 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 to be measured and

discharge all capacitors.

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 black and red test probe to cathode and

anode of the diode to be tested, respectively.

Diode Test:

Temperature Measurement

Rotate function selection switch to temperature

(select Celsius degree or Fahrenheit degree as

required) measurement position.

Connect negative and positive end of K-type

thermocouple to COM input jack and VΩmA

input jack.

Place K-type thermocouple to the object or

environment to be measured.

Read the measured result from LCD display.

Don't input the voltage higher than 30V in

temperature measurement position, to prevent

electric shock or meter damage.

Warning

• Operating environment and condition: 600V CAT. III,

pollution grade: II.

• Elevation < 2000 m

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

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

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

<70% RH (remove the battery).

• Temperature coefficient: 0.1xAccuracy/°C

(<18°C or >28°C).

• The maximum allowable voltage between

measurement end and ground: 600V DC or 600V

AC RMS.

General Specifications

When measuring diodes, to avoid injury or meter

damage, turn off the power to the circuit and

discharge all capacitors.

Warning

The meter will display the diode's forward bias

voltage value. If the test probe polarity is reversed,

the meter will display “OL”, which distinguishes

the diode's cathode and anode.

Frequency/Duty Ratio Measurement

Rotate function selection switch to frequency/duty

ratio measurement position.

Press “FUNC” key to select frequency or duty ratio

measurement function.

Connect black and red test probe to COM input

jack and VΩmA input jack, respectively.

Measure the circuit with the other ends of test probes.

Read the measured result from LCD display.

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

AC in frequency/duty ratio measurement position,

to prevent electric shock or meter damage.

Warning

AC Voltage

Resolution Accuracy

0.1V

0.001V

0.01V

40V

400V

600V

Input impedance: 10MΩ

Maximum input voltage: 600V DC or AC (RMS).

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

(average response).

Measuring range

±(1.2% of reading +5 digits)

Resistance

Resolution Accuracy

400Ω

4kΩ

0.1kΩ

0.001kΩ

0.1Ω

0.01kΩ

0.001MΩ

40kΩ

400kΩ

4MΩ

Measuring range

±(0.8% of reading +5 digits)

Overload protection: 600V DC or AC (RMS)

40MΩ0.01MΩ

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%.

• Fuse protection: grade mA: fuse F400mA/500V

grade 10A: fuse F10A/500V

• Sampling rate: about 3 times/s.

• Display: 3 3/4 bits of digit LCD display.

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

• 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 “-”

symbol.

• Power supply: AAA 1.5V batteries.

Resolution Accuracy

400mV

0.1V

0.001V

0.1mV

0.01V

DC Voltage

40V

400V

600V

Input impedance: 10MΩ

Maximum input voltage: 600V DC or AC (RMS)

Measuring range

±(0.5% of reading +3 digits)

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