Mastech MS8251B Manuale utente

REL MAX MIN %

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0 10 20 30 40 50 60 66

MS8251B

DIGITAL MULTIMETER

OPERATION MANUAL

MS8251B

01 02

1. Safety Information 1.2 Use

To reduce the risk of electrical shock, product damage

or personal injury, please follow the safety instructions

described in the user manual. read the user manual

before using the meter.

This instrument meets GB/T 13978-92 and

GB4793.1-2007 (IEC-61010-1,IEC-61010-2-032)

standards for safety requirements for electronic testing

instruments,pollution degree 2,And over voltage

rating of CAT III 1000V and CAT IV 600V.

Follow all safety instructions to ensure safe use of the

instrument.Proper use and protection of the meter will

ensure long life of the meter.

1.1 Preparation

1.1.1

1.1.2

When using the meter, follow the following

safety rules:

Always take precaution to prevent electrical shock

Never misuse the instrument

Check to see if the meter or any components were

damaged during shipment.

Check the meter and accessories thoroughly

before using.

Inspect test leads and probes for cracks, breaks or

crazes on the insulation before using the meter.

Use test leads provided with the unit.If necessary,

replace test leads with identical specifications.

1.1.3

1.1.4

1.1.5

1.2.1

1.2.2

1.2.3

1.2.4

Turn the rotary switch to the required function and

range to be measured.

When using the CAT Ⅳ environment, if the

measuring voltage between terminals and earth

ground exceeds 600V, CAT III environments or

voltage measurement between the terminal and

the earth more than 1000V, do not measure voltage.

Always be careful when working with voltages above

60V DC or 30V AC RMS. Keep fingers behind the

probe barriers while measuring.Never touch probes

during measurement.

Choose the highest range when the value to be

measured is unknown.

1.2.5 Remove test leads before switching functions on

the rotary switch.

1.2.6 Do not perform resistance, capacitance, diode and

continuity measurements on powered circuits.

1.2.7 Never connect the test leads across a voltage

source while the rotary switch is in the resistance,

diode or continuity mode. Doing so can damage

the meter.

1.2.8 Power off the circuit and discharge capacitors

before testing capacitance.

1.2.9 Do not place the meter in any environment with

high pressure, high temperature, dust, explosive

gas or vapor.

1.2.10 Stop using the meter if any failure or abnormal

function is observed.

1.2.11 Do not use meter unless battery cover is in place

a secured.

1.2.12 Avoid direct sunlight, exposing batteries to

humidity, any strong magnetic field, or high

temperatures to ensure the extended life of the

meter.

Warning

03 04

1.3 Mark

Note (Important safety information. Refer to

the operation manual)

CAT IV

Refers to the impulse withstand voltage protection

level in accordance with IEC-61010-1 standard

overvoltage(installation)category IV,pollution

degree 2

Dangerous Voltage

Compliance with requirements for double insulation

(Category II)

1.4 Maintenance

remove any oil, grease or grime. Do not use liquid

solvent or detergent.

1.4.5 When the instrument is not in use, turn rotary switch

to “OFF”

1.4.6 If the instrument is not to be used for an extended

period of time, remove the batteries to prevent

damage to the instrument.

2. Features and Components

- .

The MS8251B is a portable, hand-held yet professional

meter that features an LCD with backlight, overload

protection and low battery indicator. These meters are

easy to use with one hand, suitable for professional

users or amateurs, and ideal for school or home use.

Functions include: AC/DC voltage, AC/DC current,

resistance, capacitance, continuity, diode test,

frequency and duty cycle.

Auto and manual range.

Auto power off.

Max measurement.

Min measurement.

Relative measurement

Reading Hold function.

True RMS

Simultaneously display frequency during AC voltage/

current measurements.

Non-contact voltage test

Meter complies with European Community (EU)

standards

Earth Ground

2.1 Components

(1)

(2)

(3)

(4)

Non-contact voltage detection indicator

LCD screen

Function buttons

Rotary switch

(5) Input sockets

(6) Non-contact voltage sensor

CAT III Refers to the impulse withstand voltage protection

level in accordance with IEC-61010-1 standard

overvoltage (installation)category III,pollution

degree 2.

1.4.1 To avoid electric shock or personal injury, repairs

or servicing not covered in this manual should be

performed only by qualified personnel.

1.4.2 Remove test leads before opening battery cover

1.4.3 To avoid incorrect readings causing electric shock

or personal injury,when low battery symbol,“ ”

appears, replace batteries immediately.

1.4.4 The meter can be cleaned with a soft cloth to

Complies with U.S. and Canadian safety standards.

05 06

2.2 Buttons and Symbols

HOLDbutton: hold current reading on screen.

FUNC button: switch between functions.

RANGE button: switch between auto/manual ranges.

REL button: relative reading

MAX/MIN button: switch between maximum/ minimum

readings.

OFF position:

COM

utton: turn on/off backlight.

EMP position: thermocouple temperature measurement.

LO-Z position: identify ghost voltages.

turn off meter.

Temp V Hz% jack:voltage, current, resistance,

capacitance, diode, continuity, frequency, duty cycle,

temperature input terminal.

jack: common input terminal.

µAmA jack: current measurements <600mA.

10A jack: current measurements >600mA to 10A.

2.3 LCD display

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MS8251B

07 08

3.1 General Specifications

3.1.1 Manual and auto range

3.1.2 Full range overload protection

3.1.3The maximum voltage allowed between the measuring

end and the earth:CAT IV measurement environment

for 600V DC or AC(RMS),CAT III measurement

environment for 1000VDC or AC(RMS).

3.1.4 Maximum working height: 2000m

3.1.5 Display:LCD

3.1.6 Maximum display value:6599

3.1.7 Polarity indication:“-” indicates negativepolarity

3.1.8 Overload indication:“0L” or “-0L”

3.1.9 Sampling frequency: 0.4s (digital display)/ 0.04s

(bar graph).For current readings, 1s (digital display)

/ 0.1s (bar graph)

3.1.10 Units display: functions and units

3.1.11 Auto power off: 15 minutes

3.1.12 Power supply: 9V 6F22 battery

3.1.13 Low battery indication: LCD displays“ ”

Temperature coefficient: less than 0.1x specified

accuracy/°C

Operating temperature:0°C ~40°C

3.1.16 Storage temperature:-10°C ~50°C

3.1.17 Dimensions:175×85×52mm

3.1.18 Weight:approx.420g(including battery)

3. Specifications

The Meter should be calibrated annually between

18°C~28°C and a relative humidity less than 75%.

Alternating current

Direct current

Diode

Continuity

Autoranging mode

Maximum value

Minimum value

Low battery

Percentage (duty cycle)

Hertz, Kilohertz (frequency)

Millivolt, Volt (voltage)

Micro amp, Milliamp, Amp (current)

Nanofarad, Microfarad, Millifarad

(capacitance)

Ohm, Kilohm, Megaohm (resistance)

Relative value

AUTO

MAX

MIN

Hz, kHz

mV, V

REL

Ω, kΩ, MΩ

nF, μF, mF

μA, mA, A

Auto power off

NCV Non-contact voltage detection

Data hold

09 10

3.2.3 DC Voltage

3.2 Technical Specifications

3.2.1 True RMS Characteristics

• For non-sinusoidal signal measurement, the Meter

provides more accurate measurement than the

traditional averaging method.

• If in AC current mode, the Meter may display a random

reading between 1 and 50 when the input is not active.

This will not affect the accuracy of measurement.

• True RMS requires a minimum input level, AC current

or voltage should be 2%~100% of the maximum level.

3.2.2 Dual Impedance Characteristics

• Normal impedance(10M) with normal testing capabilities.

• Low impedance Lo-Z (400kΩ) for testing where “ghost

voltage” may be present.Ghost voltage can occur when

power supply conductors and adjacent unused

conductors create a capacitive coupling between

conductors.If this possibility exists, or when testing for

the presence of voltage, use the Lo-Z mode to switch to

the low impedance setting to remove the ghost voltages

during measurement.

- Input impedance: 10MΩ

- Overload protection: 660mV range: 250V DC or AC

(RMS),6.6V-1000V range: 1000V DC/AC (RMS)

- Maximum input voltage: 1000V DC

0.1mV ±(0.8% of reading + 3 digits)

660mV

0.001V

0.01V

0.1V

6.6V

66V

660V

1000V

±(0.5% reading + 5 digits)of

Resolution Accuracy

range

±(0.8% reading + 3 digits)of

3.2.4 AC Voltage

Frequency Range

40 ~ 60Hz

40 ~400Hz

40 ~ 400Hz

- Input impedance: 10MΩ

- Overload protection: 660mV range: 250V DC or AC

(RMS),6.6V-1000V range: 1000V DC/AC (RMS)

- Maximum input voltage: 1000V AC (RMS)

- :Response True RMS

0.1mV ±(1.5% reading

+ 5 digits)

660mV

0.001V

0.01V

0.1V

6.6V

66V

660V

±(1.2% reading

+ 5 digits)

Resolution Accuracy

range

±(1.0% reading

+ 3 digits)

3.2.4.1AC Voltage (A position)

1000V

3.2.6 Capacitance

- Overload protection: 250V DC or AC (RMS)

0.001nF6.6nF

0.01nF

0.001µF

0.01µF

66nF

6.6µF

66µF

660µF

±(3.0% reading + 3 digits)

0.1µF

Resolution Accuracy

range

0.1nF660nF

0.001mF6.6mF

66mF 0.01mF

±(4.0% reading + 5 digits)

3.2.5 Resistance

- Open circuit voltage: 1.0V

- Overload protection: 250V DC /AC (RMS)

approx.

0.1Ω660Ω

0.001kΩ

0.01kΩ

0.1kΩ

6.6kΩ

66kΩ

660kΩ

6.6MΩ

±(0.8% of reading + 5 digits)

±(1.5% reading + 5 digits)of

66MΩ0.1MΩ

0.001MΩ

Resolution Accuracy

range

Frequency Range

40 ~ 60Hz

40 ~400Hz

40 ~ 400Hz

- Input impedance: 400kΩ

- Overload protection: 660mV range: 250V DC or AC

(RMS),6.6V-1000V range: 1000V DC/AC (RMS)

- Maximum input voltage: 1000V AC (RMS)

- :Response True RMS

0.1mV ±(1.5% reading

+ 5 digits)

660mV

0.001V

0.01V

0.1V

6.6V

66V

660V

±(1.2% reading

+ 5 digits)

Resolution Accuracy

range

±(1.0% reading

+ 3 digits)

3.2.4.2 AC Voltage Low Impedance(lo-Z)

±(1.2% reading

+ 5 digits)

11 12

3.2.7 Diode Test

- Forward DC current : 1mA

approx.

Revers DC voltage: approx. 3.2V

- Overload protection:250V DC/AC(rms)

Shows approximate forward

voltage of diode

0.001V

Resolution Function

range

3.2.8 Continuity

- Open circuit voltage: approx. 1.0V

- Overload protection:250V DC/AC(rms)

If measured resistance is

less than 50Ω, a buzzer will

sound

0.1Ω

Resolution Function

range

1000V

13 14

660µA

±(1.5% reading + 5 digits)

66mA

10A

0.1µA

1µA

10µA

10mA ±(3.0% reading + 5 digits)

6600µA

660mA 100µA

Resolution Accuracy

range

3.2.11 AC Current

Overload protection:

µA and mA grade: Fuse FF600mA/1000V,

A : Fuse FF10A/1000V.

- Frequency range: 40 ~ 400Hz

position

- Response: True RMS

When the target current is larger than 5A, do not continue

measurement for more than 10 sec. Pause for 1 minute

after the measuring.

3.2.10 DC Current

Overload protection:

µA and mA : Fuse FF600mA/1000V,

: Fuse FF10A/1000V.

position

A position

When the target current is larger than 5A, do not continue

measurement for more than 10 sec. Pause for 1 minute

after the measuring.

660 Aµ

±(1.0% reading + 5 digits)

66mA

10A

0.1µA

1µA

10µA

10mA ±(2.0% reading + 5 digits)

6600 Aµ

660mA 100µA

Resolution Accuracy

range

- :

- : >

Range 10Hz~10kHz

Input Voltage 0.2V AC (Input voltage should increase

along with the frequency)

3.2.9 Frequency

3.2.9.1 Frequency (V position):

66Hz

±(1.5% reading + 5 digits)

660Hz

6.6kHz

10kHz

0.01Hz

0.1Hz

0.001kHz

0.01kHz

Resolution Accuracy

range

66Hz ±(1.5% reading + 5 digits)

660Hz

660kHz

6.6MHz

0.01Hz

0.1Hz

0.1kHz

1kHz

Resolution Accuracy

range

3.2.9.2 Frequency (Hz position):

66MHz 10kHz

6.6kHz

66kHz

0.001kHz

0.01kHz

±(1.5% reading + 5 digits)

- Overload protection:250V DC/AC(rms)

- Input Voltage:3V peak to peak AC

1 - 99% ±2.0%

0.1%

Resolution Accuracy

range

3.2.9.3 Duty Cycle

15 16

3.2.12 Temperature

Range Input Test Range Accuracy

Ambient Temp ±2 digits

±4 digits

±5 digits

±4 digits

±20 digits

0~1000°C 400°C

1000°C

800°F

1800°F

32~1832°F

±(1.0% of reading

+3 digits)

4. Using the Meter

4.1 Data Hold

4.2.1

Note:

In voltage, current, resistance and capacitance

modes, the default range is “AUTO”

4.2.2 Press “RANGE” to enter manual ranging.Each

press switches to a higher range.Pressing the

button at the highest range will return to the lowest

range.

4.2.3 Hold “RANGE” to return to “AUTO”

4.2.4 Pressing “RANGE” in Max/Min mode will return the

meter to normal reading.

Manual range is disabled in frequency mode.

4.2 Manual Range

4.1.1 During a measurement, press the “HOLD” button

once to hold the reading.

4.1.2 Press “HOLD” again to release the hold.

4.3 Relative Measurement Mode Switch

4.3.1

will store the reading when pressed and display the

difference between current reading and the stored

reading.

Press “REL to enter relative measurement. This

4.4.1 Press “MAX/MIN” to display the maximum value

recorded

4.4.2 Press “MAX/MIN” again to display the minimum

value recorded.

4.4.3 Hold “MAX/MIN” to return to normal readings.

4.4 Maximum/Minimum Reading

4.5 Function Switching

4.6 Backlight

4.7 Automatic Power-off

4.8 Non-Contact Voltage Detection (NCV)

4.7.1 If there is no operation for 15 minutes after turning

the machine on, the meter will automatically power

off to save the battery.

4.7.2 After automatic power-off, press any key to turn the

meter on again.

4.7.3 Holding the "FUNC" key when powering on will

cancel automatic power-off function.

4.8.1 With the rotary switch in any position except OFF,

hold down the “NCV” button.

4.8.2 Move the tip of the meter near the voltage source

or conductor.If the voltage detected is greater than

110VAC, the buzzer will beep and the NCV indicator

near the tip of the meter will flash.

4.5.1 In voltage or current modes, press “FUNC” to

switch between AC and DC.

4.5.2 In resistance, diode or continuity modes, press

“FUNC” to switch between measurements.

4.5.3 In temperature mode, press “FUNC” to switch

between °C and °F.

4.6.1 Press “ ”to turn on backlight.Press again to turn off.

4.3.2 Press “REL ” again to return to normal.

Ambient Temp ±2 digits

17 18

Note：

1.Even though there is no indication,voltage may still

exist.Do not rely solely on NCV detector to determine

the presence of voltage in a wire.The measurement

may be affected by the design of the outlet,type of

insulation and other external factors.

2.The voltage sensing indicator may turn on when a

voltage is fed to the meter.

3.Other external interference(ex.Flashlight,motor)may

trigger the NCV sensor.

4.9 AC/DC Voltage

Voltage is the electrical potential difference between two

points in a circuit. AC polarity changes over time, where

DC polarity stays constant.

Measuring AC or DC voltage:

4.9.1 Move the rotary switch to the “V” position.

4.9.2 Connect the red test lead to the “V” jack and the

black test lead to the “COM” jack.

4.9.3 Connect the test leads to the voltage source or load.

4.9.4 The measured voltage will be displayed.For DC

voltage, polarity of the red test lead will be

indicated.

4.9.5 Press “FUNC” to switch between AC/DC voltage.

4.11 Continuity

4.11.1 In resistance mode, press “FUNC” to switch to

continuity mode.

4.11.2 Connect the red test lead to the input jack and the

black test lead to the “COM” jack.

4.11.3 Connect the test leads to the circuit.

4.11.4 If the resistance of the circuit is less than 50Ω, a

buzzer will sound.

4.12 Diode

4.12.1 In continuity mode, press “FUNC” to switch to

diode mode.

4.12.2 Connect the red test lead to the input jack and the

black test lead to the “COM” jack.

4.12.3 Connect the red test lead to the anode (+) and the

black lead to the cathode (-) of the diode.

4.12.4 The meter will display the forward biased voltage

drop across the diode.

4.10 Resistance

4.10.1 Move the rotary switch to the position.

4.10.2 Connect the red test lead to the “Ω” jack and the

black test lead to the “COM” jack.

4.10.3 Connect the test leads to the circuit.

4.10.4 Resistance value will be displayed.

”

4.13 Capacitance

4.13.1 Move the rotary switch to the “

4.13.2 Connect the red test lead to the input jack and the

black test lead to the “COM” jack.

4.13.3 Connect the test leads to the circuit/capacitor.

4.13.4 Capacitance value will be displayed.

”position.

4.14 Frequency and Duty Cycle

4.14.1 Move the rotary switch to the “Hz%” position.

4.14.2 Connect the red test lead to the input jack and the

black test lead to the “COM” jack.

4.14.3 Connect the test leads to the circuit.

4.14.4 The measured frequency and duty cycle will be

displayed simultaneously.

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