Mastech MS8240B Manuel utilisateur

MS8240B

Digital Multimeter

FUNC HOLD

MAX

FUSED FUSED

Digital Multimeter

Operating Instruction

MS8240B

1. Introduction

CONTENTS

5. Measurement Operation

5.1 DC & AC Voltage Measurement

5.2 Resistance Measurement

5.3 Diode/Continuity Check

5.4

5.5 Transistor Check

5.6 Frequency Measurement

5.7 DC/AC mA/10A Measurement

5.8 Inductance Measurement

5.9 Temperature Measurement

Capacitance Measurement

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

.........................10

....................10

2. Safety note

3. Product Overview

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

....................................3

3.1 Meter Illustration

3.2 Functional Push Button

3.3 Display Indicators

..................................3

.........................4

4. Specification............................................5

4.1 General Feature

4.2 Electrical Specification

....................................5

..........................6

.......................11

..................12

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

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

.............15

....................16

..................16

6. Maintenance

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

6.1 Replacing The Battery

6.2 Fuse Replacement

6.3 Cleaning and Decontamination

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

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

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

1. Introduction

This Meter is a handheld and battery operated Digital

Multi Meter(DMM) with multi function. This Meter is

designed to meet IEC-61010-1 CAT III 1000V over

voltage category and double insulation. The entire

outer surface of the case has been formed with thermo

plastic elastomer,giving the main body, though

downsized, high resistance against the shock of a drop.

This operating instruction covers information on safety

and caution. Please read relevant information carefully

and observe all the warnings and note strictly. The

DMM as general measurement tool and widely used in

the school, laboratory, factory etcsocial field.

2. Safety Note

To avoid possible electric shock or personal injury and

to avoid possible damage to the meter or to the

equipment under test, adhere to the following rule:

Warning

..................................4

............10

• Do not apply more than the rated voltage of marked

on the meter

• Do not apply voltage between COM and OHM

terminal, in the resistance measuring state.

• Do not measure current with test lead inserted into

voltage or OHM terminal.

• Do not expose the instrument to the direct sun light,

extreme temperature and humidity or dew full.

• Inspect the test lead for damaged insulation or

exposed metal.

• Before measuring current, check the Meter's fuses

and turn off power to the circuit before connecting

the meter to the circuit.

FUNC HOLD

MAX

FUSED FUSED

0302

Dangerous voltage Grounding

(Alternating Current)

Double insulation

DC (Direct Current)

Fuse

3. Explanation of Controls and Indicators

3.1 Meter Illustration

FRONT PANEL

• Disconnect circuit power and discharge all high

voltage capacitors before testing continuity, diode,

resistance, capacitance or current.

Note international Electrical Symbol.

AC or DC

Warning see

explain in manual

(1) LCD Display

(2) “MAX” push button　　　

(3) “HOLD” push button

(4) Rotary Switch (Knob)

(5) “V. Ω. Hz” Input terminal

(6) “COM” terminal

(7) “μA.mA.°C.Cx.Lx.hFE”Input terminal

(8) “10A” input terminal

(9) Power switch(ON.OFF)

(10) “FUNC” push button

(11) “BKLIT” push button

04 05

3.2 Functional Push Button

“FUNC” key is the function select key that

acts with trigger. Use the key as switch of

DC/AC voltage,DC/AC current ,

Resistance/Continuity and °C/°F.

Press “HOLD” to enter and exit the hold

mode in any mode. That act with trigger.

This key is act with trigger. Press this key

once, the maximum value is holding (Will

displays 'MAX' symbol in the LCD).

After pressing the key, A/D will keep

working, and the display value are always

up dated and kept the maximum value.

(The actual gained value is not the

peak value.).

This key is used to control Backlight.

This key is act with trigger. When press

the key, will enable Backlight for 15 sec.

Press the key again within 15 sec,

Backlight will disable.

ON/OFF Lock type Power Switch.

FUNC

HOLD

MAX/MIN

Push button Function

Back light

3.3 Display Indicators

FIG 2 LCD

Number Indicator Meaning

MAX

HOLD

MkΩ

°C/°F The unit of temperature ( °C:

Centigrade; °F: Fahrenheit)

9µmVA uV mV V is unit of voltage

uA mA A is unit of current

Indicate negative reading

Capacitance Indicator

mH/H

nµmF

Inductance Indicator

Inductance Units

Capacitance Units

Ω KΩ MΩ is unit of resistance

Low battery indicator

Data hold

Maximum value

Diode

AC voltage or current

DC voltage or current

06 07

4. Technical Specifications

4.1 General Specifications

• Manual ranging DMM , that full scale is 1999 counts

• Display : 3 1/2 digit LCD display.

• Over load protection: Used the PTC protection

circuit for Resistance, capacitance And frequency

measurement.

• DATA HOLD function

• MAX value measurement function

• Back Light

• Low battery indication

• Auto Power- OFF.

• Operating temperature & Humidity: 0 ~ 40°C

(32~104°F) & < 80% RH

• Storage temperature & Humidity: -10 ~ 50°C

(14~122°F) & <70%RH

• Power Supply: 1.5V Battery(AA Type)×4

• Safety Class: IEC-61010-1, 1000V CAT III,

600V CAT IV.

• Dimension (L×W×H) & Weight:

205 mm×102 mm×58mm, Approx. 390g.

4.2 Electrical Specification( at 23±5 <75% RH)°C

4.2.1 DC voltage

Range Resolution Accuracy

200mV 0.1mV

20V

200V

1000V

1mV

10mV

100mV

±(0.5% rdg + 2dgt)

* Input impedance: 10MΩ

* Over load protection: 250V DC/AC(rms)

at 200mV Range.

* Max input voltage: 1000VDC

4.2.2 AC voltage

Range Resolution Accuracy

200mV 0.1mV

20V

200V

1000V

1mV

10mV

100mV

±(0.8% rdg + 3dgt)

±(1.0% rdg + 5dgt)

* Input impedance: 10MΩ

* Over load protection: 250V DC/AC(rms)

at 200mV Range.

* Frequency response: 40~400Hz

* Average rectifier type.

* Max input voltage: 750V AC rms

4.2.3 Resistance

Range Resolution Accuracy

200Ω0.1Ω

2kΩ

20kΩ

200kΩ

2MΩ

20MΩ

0.001kΩ

0.01kΩ

0.1kΩ

0.001MΩ

0.01MΩ

±(0.8% rdg + 3dgt)

±(1.5% rdg + 5dgt)

* Over load protection: 250V DC/ AC rms

08 09

4.2.4 Diode

Range Resolution Function

0.001V Will display the forward

drop voltage.

* Over load protection: 250V DC/ AC rms

4.2.5 Continuity

Range Function

If measured resistance less than 30Ω,

will buzzer is sounded.

* Over load protection: 250V DC/ AC rms

4.2.6 DC Current

Range Resolution Accuracy

2mA

20.00mA

200.0mA

10.00A

1µA

0.01mA

0.1mA

0.01A

(1.0% rdg + 3dgt)

(2.0% rdg + 3dgt)

* Over protection: use the fuse(F250mA/1KV)

at mA range, and use the fuse(F10A/1KV) at 10A range.

* Max input current: 200mA at 'mA' jack

and 10A at '10A' jack.

4.2.7 AC Current

Range Resolution Accuracy

2mA

20mA

200.0mA

10.00A

1µA

0.01mA

0.1mA

0.01A

(1.5% rdg + 5dgt)

(3.0% rdg + 10dgt)

* Over protection:use the fuse(F250mA/1KV) at mA

range, and use the fuse(F10A/1KV) at 10A range.

* Max input current::200mA at 'mA' jack and

10A at '10A' jack.

* Frequency response:40 ~ 400Hz

4.2.8 Temperature

You can selecting Centi-degree[°C] or Fahrenheit

[°F] by “FUNC” key.

Range -20°C ~ 1000°C

-20°C~0°C

1°C

400°C~1000°C

* Over load protection: use the fuse[ F250mA/1KV].

(2.0% rdg + 3dgt)

Resolution

0°C~400°C

Fahrenheit Temperature [°F]

Accuracy (1.0% rdg + 3dgt)

(5.0% rdg + 4dgt)

0°F~1800°F

Range

-0°F~50°F

1°F

750°F~1800°F (2.0% rdg + 3dgt)

Resolution

50°F~750°F

Accuracy (1.0% rdg + 3dgt)

(5.0% rdg + 4dgt)

10 11

4.2.9 Capacitance

Range Resolution Accuracy

2nF 0.001nF

±(4.0%rdg +5dgt)

20nF

200nF

2µF

20µF

0.01nF

0.1nF

0.001nF

0.01µF

* Over load protection: use the fuse[F250mA/1KV]

200µF 0.1µF ±(5.0%rdg +10dgt)

4.2.10 hFE

Range Function

hFE: 1~1000

hFE

* Over load protection: use the fuse [F250mA/1KV ]

4.2.11 Frequency

* Sensitivity: 200mV -5V AC rms

* Over load protection: 250V DC/AC rms

Range Resolution Accuracy

20kHZ 1HZ ±(1.5%rdg+5dgt)

4.2.12 Inductance

Range Resolution Accuracy

2mH 0.001mH ±(4.0%rdg +8dgt)

20mH

200mH

0.01mH

0.1mH

1mH

20H 10mH

±(4.0%rdg +3dgt)

±(4.0%rdg +5dgt)

• Over load protection: use the fuse [ F250mA/1KV]

To avoid harms to you or damage to the

meter from electric shock. Please do not

attempt to measure voltage higher than

DC 1000V/AC 700Vrms although readings

may be obtained.

5.1 DC & AC Voltage Measurement

5. Measurement Operation

The DC voltage ranges are 200.0mV, 2.000V, 20.00V ,

200.0V and 1000V; and then. The AC voltage ranges

are 200.0mV,2.000V, 20.00V, 200.0V and 750.0V.

To measure DC/AC voltage:

1. Insert the red test lead into the “VΩ” input terminal

and the black test lead into the COM terminal.

2. First time, Default mode is DC measurement mode,

you can select the AC voltage mode by 'FUNC“ key.

3. Set the rotary switch to proper DC/AC mV or V range.

4. Connect the test lead across with the object being

measured. The measured value will be show on the

LCD display.

6. If the “OL” symbol is displayed on the LCD, you

must be set the rotary switch to the higher range.

Note:

In the rang of 200mV in DC/AC and 2V AC, even in the

absence of input or connectivity test leader, there also

have something display on LCD. in this case,

short-circuit "V" and "COM", so that LCD display

back to zero.

12 13

To avoid damage to the Meter or to the

equipment under test, disconnect power

and discharge all high-voltage capacitors

before resistance measurement.

5.2 Resistance Measurement

The resistance range are:200Ω,2.000kΩ,20.00kΩ,

200.0kΩ,2.000MΩ,20.00MΩ.

To measure resistance, connect the meter as follows:

1. Insert the red test lead into the ”VΩ” terminal and

the black test lead into the COM terminal.

2. Set the rotary switch to proper resistance range.

Connect the test lead across with the object being

measured. The measured value will be display

on the LCD.

Note:

The test lead can add 0.1Ω to 0.2Ω of error to

resistance measurement. To obtain precision reading

in low-resistance measurement, that is the range of

200.0Ω, short the input terminal before measuring. In

this time, the contact resistance displayed on the LCD.

You can subtract the contact resistance value from

the measured value.

For high-resistance measurement (>10MΩ), it is

normal taking several second to obtain stable reading.

The LCD display “OL” indicating open-circuit for the

tested resistor or the resistor value is higher than the

maximum range of the meter.

To avoid damage to the Meter or to the

equipment under test, disconnect power

and discharge all high-voltage capacitors

before Diode/Continuity check.

5.3 Diode/Continuity check

To avoid damage to the Meter or to the

equipment under test, disconnect power

and discharge all high-voltage capacitors

before Diode/Continuity check.

1. insert the red test lead into the “VΩ” terminal and the

black test lead into the COM terminal.

2. Set the rotary switch to Ω position.

2. For forward voltage drop reading on any

semiconductor component, place the red test lead

on the component anode and place the black test

lead on the component cathode. The measured

value show on the LCD.

3. Select the continuity check mode by the “FUNC” key.

The buzzer may be sound if the resistance of a circuit

under test is less than 30Ω.

5.3 Capacitance Measurement

1. insert the red test lead into the “VΩ” terminal and the

black test lead into the COM terminal.

2. Set the rotary switch to Ω position.

2. For forward voltage drop reading on any

semiconductor component, place the red test lead

on the component anode and place the black test

lead on the component cathode. The measured

value show on the LCD.

3. Select the continuity check mode by the “FUNC” key.

The buzzer may be sound if the resistance of a circuit

under test is less than 30Ω.

14 15

5.5 Capacitance Measurement

Warning

To avoid damaging meter or device to be measured,

before continuity tests, turn off all circuits to be

tested and discharge all capacitors.

The capacitance measuring range of this meter:

2.000nF, 20.00nF, 200.0nF, 2.000uF and 200.0uF.

Method of measuring capacitance:

1. Rotate switch to the appropriate position.

2. Connect black and red test probe to COM input socket

and V input socket, respectively. (You can also use

the dedicated multifunction test holder to measure

capacitance).

3. Measure the two leads of the capacitor to be tested

with other two ends of test probes and read the

measured value from LCD display.

Note:

When measuring bulk capacitors with this meter,

readings will be stablizee after a few seconds.

When measuring the small capacitor with less than 20nF,

the distributed capacitance (displayed base number)

of the meter and wire should be subtracted.

5.6 Transistor Measurement

Warning

Do not apply any RMS voltage higher than 250V DC

or AC between common end and hFE end.

This prevents electrical shock and/or meter damage.

Method of measuring transistor:

1. Rotate the switch to hFE position.

2. Plug multi-function socket with correct polarity

(the “+” end of multi-function socket is connected with

hFE end, “COM” end is connected with common end).

3. Determine that the transistor is NPN or PNP type,

then insert three pins of transistor, e.b.c, to the

corresponding holes of dedicated multi-functional

socket.

4. Read hFE approximation of transistor to be measured

from LCD display.

16 17

5.7 Frequency Measurement

Warning

Do not measure the frequency of RMS voltage

higher than 250V DC or AC. This prevents electrical

shock and/or meter damage.

Method of measuring frequency:

1. Rotate switch to 20KHZ position.

2. Connect black and red test probe to COM input socket

and HZ input socket, respectively.

3. Measure the frequency value of circuit to be tested

with other two ends of test probes.

4. Read the measured frequency value from LCD display.

Note:

Do not input the voltage over 10V RMS, as accuracy of

readings cannot be guaranteed.

5.8 Current Measurement

Warning

To avoid damage to meter or device, before

measuring current, please check the meter's fuse.

When measuring, use correct input socket, function

selection and measuring range.

When the circuit voltage is over 250V, do not attempt

to measure current on the circuit.

When the test probe is inserted to the current input

socket, don't connect the other end of the test probe

with any circuit in parallel.

DC measuring range of meter:

2.000mA, 20.00mA, 200.0mA and 10.00A;

AC measuring range: 200.00mA and 10A.

Method of measuring current:

1. Turn off the power supply and discharge all high

voltage capacitors on the circuit to be tested.

2. Rotate switch to the appropriate position.

3. Connect the black test probe to the COM input socket.

If the current to be tested is lower than 200mA, connect

the red test probe to the mA input socket. If the

measured current is between the range of 200mA~10A,

the red test probe should be connected to 10A input

socket.

4. Turn off the circuit to be tested. Connect the black test

probe to the low voltage end of disconnected circuit to

be tested and the red test probe is connected to the

other end (high voltage) of disconnected circuit.

5. Connect the power supply to the circuit, then read the

LCD display. If the display shows only “OL”, it means

that the input is out of the selected input range.

Please rotate the switch to a higher measuring range.

6. Turn off the power to the circuit tested. Discharge all

the capacitors, remove the test probes from the meter

and restore the circuit to the original state.

Note:

1. When measuring current, the meter should be

connected in series, instead of in parallel, to avoid the

meter damage and risking personal safety.

2. Lengthy measurements of large currents (>10A) will

affect the display accuracy of the meter. Standard test

time cannot be over 10 seconds in any 3 minute period.

3. During DC measurement, if the test probes are

connected in reversal order to the circuit, the display

will become negative, but the measurement accuracy

of the meter will not be affected.

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