Mastech MS8240D Manuel utilisateur

Digital Multi Meter

OPERATING INSTRUCTION

Table of Contents

1．Introduction

2．Safety note

3．Explanation of Controls and Indicators

3-1. Product illustration

3-2. Functional push button

3-3. LCD display

4．Specification

4-1. General Feature

4-2. Electrical Specification

5．Measurement operation

5-1. Push key function

5-2. DC voltage & AC voltage measurement

5-3. Resistance measurement

5-4. Continuity & Diode check

5-5. Capacitance Measurement

5-6. Frequency & Duty Cycle Measurement

5-7. DC/AC uA measurement

5-8. DC/AC mA measurement

5-9. DC/AC 10A measurement

6. Maintenance

6-1. Replacing the battery

6-2. Replacing the fuse

6-3. Cleaning and Decontamination

- 3 -

7. USB interface for communication to computer.

7-1. Connect the Meter to Personal Computer(PC) with USB

cable

7-2. Installation of application software

1. Introduction

This Meter is a handheld and battery operated Digital Multi Meter(DMM)

with multi function. This Meter is designed to meet IEC1010-1 CAT III 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.

The MS8240D are a high performance, low power consumption and 4 1/2 digits

(22000 counts)

With 46 segments bar graph.

It is have True-RMS function forAC voltage andAC current measurement.

Most alternating voltage and current are expressed in effective value, which are

referred to RMS (Root-Mean-Square) value. The effective value is the square

root of the average of the square of alternating current or voltage value. But

they actually measure the average value of input

Voltage or current, assuming the voltage or current to be a sine wave. Therefore,

the meter with rectifier type circuit are in error if the input voltage or current

has some other shape than a sine wave. This operating instruction covers

information on safety and caution. Please read relevant information carefully

- 4 -

and observe all the warnings and note strictly.

2. Safety note

Warning

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:

●Do not apply more than the rated voltage, of marked on the meter, between

the input terminal and grounding terminal..

●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 .

●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.

●Disconnect circuit power and discharge all high voltage capacitors before

testing continuity, diode, resistance, capacitance or current.

- 5 -

Note international Electrical Symbol.

Dangerous Voltage

Ground

AC （Alternating

current）

Warning see

explain in manual

DC (Direct Current)

Double insulation

AC or DC

Fuse

Measurement category(over voltage category):

This instrument is meet the safety condition of CAT III. The

equipment is used

for measurement in building facilities. Examples are measurements on

distribution boards, circuit breaker and industrial equipment located in

fixed facilities, as a fixed

motor.

If the equipment (include probe assembly; type:T

3009, 10A 1KV

CAT III) is used in a manner not specified by

the

manufacturer, the protection provided by the equi

pment/probe

assembly may be impaired. If necessary, the probe assembly

must be replaced with the type specified in this manual.

3. Explanation of controls and indicators

3-1. Meter illustration

①LCD display

②“REL”push button

③“RANGE”push button

④⑽“BKLIT”/ “PC-Link”push button

⑤“MAX/MIN”push button

⑥“HOLD”push button

⑦“FUNC”push button

⑧“VAHz/%”push button

⑨“PEAK”push button

⑾Rotary Switch(Knob)

⑿Input terminal

⒀“COM”terminal

⒁“10A”input jack

⒂“uA/mA”input jack

3-2. Functional push button

Push button

Function

Func

“FUNC”key is the function select key that acts with trigger.

Use the key as switch of DC/AC,

Resistance/Continuity/Diode .

HOLD

Press “HOLD”to enter and exit the hold mode in any mode.

That act with trigger.

MAX/MIN

This key is act with trigger. Press this key once, the maximum

value is holding (Will displays ‘MAX’symbol in the

LCD)and press once again this key, the minimum value on

holding(Will displays ‘MIN’symbol in the LCD).When

“MAX/MIN”key is pressed for third time, the meter

displays max value, and then, “MAX”and “MIN”symbol

is blinking. The meter returns to normal operation if

“MAX/MIN”key is pressed and held for longer than once

second. after pressing the key, A/D will keep working, and the

display value are always up dated and kept the maximum or

minimum value. (The actual gained value is not the peak

value.). Pressing “HOLD”key in the MAX/MIN mode

Makes the meter stop updating the maximum or the minimum

value.

RANGE

It is the auto/manual measurement push key that act with

trigger. The default is auto measurement when power is on.

To press once time, will switch to manual measurement. If

continue to press the key in the top range, the meter will jump

to the lowest range, and recirculate orderly. If press and hold

this key Over 1second, the meter will switch toAuto

Measurement mode.

REL

Press the “REL”key, you can measure the relative value and ‘REL’sign

will appears on the LCD display in the relative mode.

What is meant by relative value? Press the “REL”key, the meter make

the first measured value into a reference value (You must be decide a

reference value as the input signal.) , and the meter store the displayed

reading as a reference value.

The relative measured value that displayed in LCD is achieved by

subtracting a reference value from the present reading value.

Vx - Vref=Vdisplay

Max/Min mode can be nested in REL mode. The meter displays

maximum or minimum value relative to the reference when

“Max/Min”is pressed in REL mode. This time, pressing “HOLD”

key .the meter stop updating the LCD

displayed value.

VAHz/%

When press this key in the voltage or current measurement mode, the

meter

Will switch to frequency measurement mode, you can reading frequency

value of the present measured voltage or current.

This key acts in activation. Press “VAHz/% ”key when frequency mode

is in operation, the meter will switch to duty cycle measurement mode.

Press this key again to switch to frequency measurement mode also.

Duty cycle range is within 5.0% to 94.9%. If the source frequency duty

cycle is smaller than 5.0%, the ‘UL’sign will be shown on the LCD

display, and then if the duty cycle is larger than 94.9%, the ‘OL’sign

will be shown on the LCD display.

PEAK

Entering PEAK mode will automatically execute peak calibration, if

peak calibration was never done before. When press this key, the meter

can measure maximum peak value, and ‘Pmax’sign will be shown on

the LCD display. when press this key again, the meter measure

Minimum peak value and ‘Pmin’sign will be shown on the LCD

display. If press and held this key over 1 second in ‘Pmin’active, the

meter returned normal operating mode..

BL/

PC-Link

This key is used control Backlight. This key is act with trigger. When

press the key, will enable Backlight for 60 sec. Press the key again

within 60 sec, Backlight will disable. When press this key more than

3secs , ‘PC-Link’sign will be shown on the LCD display, this means

serial data output is enabled.

3-3. Display indicators

Number

Indicator

Meaning

Auto

The meter is in the auto range mode.

DC voltage or current

AC voltage or current

Diode

MAX

Maximum value

MIN

Minimum value

HOLD

Data hold

Pmax, Pnin

Maximum peak value

and Minimum peak value

Low battery indicator

MKΩ

ΩKΩMΩis unit of resistance

℃/℉

The unit of temperature

(℃: Centigrade; ℉: Fahrenheit)

umVA

uV mV V is unit of voltage

uA mAA is unit of current

－

Indicate negative reading

REL

Relative measurement

Duty cycle

numF

Capacitance Units.

Auto- power OF



 



Fig. 2 L C D

4. Specification

4-1. General Feature

●Auto ranging DMM , that full scale is 22000 counts

●Display : 4 1/2 digit LCD display with 46 segment bar graph.

●Over load protection: Used the PTC protection circuit for Resistance,

capacitance

And frequency measurement.

●DATA HOLD function

●MAX/MIN value measurement function

●AUTO/MANUAL Mode selection

●Back Light

●Low battery indication

●True- RMS measurement for AC voltage /AC current measurement

●Relative value measurement function

●USB interface for communication to the computer.

●Auto Power- OFF. The meter has a default auto-power function. If the meter

is idle for more than 15minutes, the meter automatically turns the power off.

User to disable Auto-power OFF, may be power on the meter when any of

the push function, except for HOLD is pressed down.

●Operating temperature & Humidity: 0 ~ 40℃(32 ~104 ℉) & < 80% RH

●Storage temperature & Humidity: -10 ~ 50℃(14 ~ 122 ℉) & <70%RH

●Power Supply: 1.5V Battery(AA Type) x 4

●Safety Class: IEC1010-1, CAT III

●Dimension (L x W x H) & Weight: 205 x 102 x 58mm, Approx. 390g.

- 13 -

●Environmental condition: （1）Indoor use；

（2）Altitude up to 2000meter.

Accessory：

[1] MS3202 Socket for temperature measurement --- 1pc

[2] USB Cable --- 1pc

[3] CD （with USB program）--- 1pc

4-2. Electrical Specification

Function

Range

Best.

Resolution

Accuracy

Over Load

Protection

DC Voltage

2.2/22/220/1000V

0.1mV

(0.05%rdg+3dgt）

○

AC Voltage

(40-400Hz)

2.2/22/220/700V

0.1mV

±(0.8%rdg+4dgt)

○

DC mV

220mV

0.01mV

(0.05%rdg+3dgt)

○

AC mV

(40-400Hz)

220mV

0.01mV

±(0.8%rdg+4dgt)

○

DC Current

220u/2200u/22m/

220m/10A

0.01u

±(0.8%rdg+4dgt)

○

AC Current

(40-400Hz)

220u/2200u/22m/

220m/10A

0.01u

±(1%rdg+3dgt)

○

±(1.5%rdg+3dgt)

○

Resistance

220/2.2K/22K/220K/

2.2M/22M/220MΩ

0.01Ω

±(0.8%rdg+2dgt)

○

Capacitance

22n/220n/2.2u/22u/220u/

2.2m/220mF

1nF

±(2.5%rdg+3dgt)

○

Frequency

22Hz/220Hz/2.2KHz/

22K/220KHz

0.01Hz

±(0.2%rdg+3dgt)

○

Continuity

Check

Buzzer sounds

at less than

30Ω

Open circuit voltage:

about 2.7V

○

Diode

Check

Testing Current:

About 1.5mA

Open circuit voltage:

about 2.7V

5. Measurement operation

5-1. Push key function

All the enabled push key function will be reset when the measurement mode

is changed by

Function rotary switch . Change measurement mode by “FUNC”key will

reset enabled range,

“HOLD”, “MAX/MIN”, “REL”and “PEAK”function. The following table

lists .The available push key function versus every measurement mode.

KEYS

MODE

RANGE

HOLD

Max/Min

REL

PEAK

VAHz

Voltage

○

Current 1

○

Current 2

○

Resistance

○

Capacitance

○

Frequency

○

Duty cycle

○

Continuity

○

Diode

○

Note: Current 1 includes Auto uA, Auto mA, 10A mode.

Current 2 includes Manual 2.2A, 10A mode.

5-2. DC & AC voltage measurement

Warning

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 750Vrms although

readings may be obtained.

To measure mV(millivolt) you can set the rotary switch to mV range, this

range is 220.00mV only.

The DC voltage range are 2.2000V 22.000V 220.00V and 1000V; and then.

The AC voltage ranges are 2.2000V 22.000V 220.00V 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. Set the rotary switch to mV or V position.

Default status is DC voltage measurement mode; and thenAC voltage

measurement mode may be select by FUNC push key.

3. Connect the test lead across with the object being measured.

The measured value will be show on the LCD display.

Note:

When DC orAC voltage measurement has been completed,

disconnect the connection

between the testing lead and the circuit under testing.

5-2. Resistance measuremen

The resistance range are: 220.00Ω2.2000KΩ,22.000KΩ, 220.000KΩ,

2.2000MΩ.

22.000MΩand 220.0MΩ( Note: it is not 220.00MΩto prevent the

least digit from jumping).

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 Ωposition. At the start, the meter is

resistance mode.

In this range, you can switch to continuity and diode check mode by the

“FUNC”key. Its sequence as follows:

Ω→→→Ω

3. Connect the test lead across with the object being measured.

The measured value will be show on the LCD display.

Note:

The test lead can add 0.1Ωto 0.2Ωof error to resistance

measurement. To obtain precision reading in low-resistance

measurement, that is the range of 220.00Ω, 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

- 18 -

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.

5-3. Diode/Continuity check

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

into the COM terminal.

②Set the rotary switch to Ωposition. To select the

continuity mode, press one time the “FUNC”push button.

③The buzzer sound if the resistance of a circuit under test is less than 30

Ω.

④Select the diode check mode by the “FUNC”key.

⑤Use the diode test mode to check diodes, transistors and other

semiconductor device. In the diode test mode sends a current through

the semiconductor junction, and the measure the voltage drop across

the junction.A good silicon junction drop between 0.5V and 0.8V.

⑥For 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

display.

⑦Reverse the test lead and measure the voltage across the diode again.

- 11 -

If diode is good, the display shows “OL”.

If diode is shorted, the display shows 0 (zero) in both direction.

If display shows “OL”in both direction, the diode is open.

- 19 -

5-4. Capacitance measurement

Warning:

To avoid damage to the Meter or to the equipment under test,

disconnect power and

discharge all high-voltage capacitors before measuring

capacitance.

You can use the DC voltage function to confirm that the capacitor

is discharged.

Capacitance ranges are 22.00nF, 220.0nF, 2.200uF, 22.00uF, 220.0uF,

2.200mF and 220.0uF.

To measure capacitance, connect the Meter as follows:

1. Set the rotary switch to“”position.

2. For the convenience of user, provided the MS3202 Multi

Function Socket as accessory. First time, insert the Socket to

the “VΩ”input terminal and “COM”terminal, and then

insert the capacitor to the two holes on the Socket. The pin

marked “Cx/Lx/Temp”is pointed to

the “VΩ”input terminal, and the pin marked “COM”is

pointed “COM”input terminal respectively.

The measured value will be displayed on the LCD display.

- 20 -

NOTE:

[1] You can used the MS3202 Socket according to the capacitor pin size.

. The pin( marked ”Cx/Lx/Temp”) of MS3202 Socket must be pointed

to the “VΩ”input terminal.

If the capacitor pin is thick ( i.e, Diameter of pin >1 mm),

the insert to the MS3202 socket is disabled. In this case ,

directly insert the capacitor under test to the “COM”and

“VΩ”terminals, or using the leads(probe) to measuring

capacitance of capacitor.

[2] To increase the accuracy of capacitance measurement when measuring

under 5nF capacitance, you can connecting 0.15uF Capacitor in parallel

with the capacitor being

measured , or use relative measurement mode to automatically subtract the

capacitance build-in equalized capacitance and residual capacitance of

PCB lead wire from the result. .

5-5. Frequency & Duty cycle measurement

The normal measurement ranges are 22.00Hz, 220.0Hz, 22.000KHz,

220.00KHz,

2.2000MHz., 22.000MHz and 220.00MHz.

1. Set the rotary switch to ‘Hz/%’position，and the‘Hz’sign shown

on the LCD display.

2. Insert the red test lead into the “ VΩ”input terminal and the black

- 21 -

3. test lead into the “COM”terminal.

4. Connect the test leads across with the circuit under testing. The

measured value shown.

on the LCD display.

5. To switch to the duty cycle mode , press “VAHz/%”. Push key.

The duty cycle mode range is within 5.0% to 94.9%. The minimum

resolution is 0.1%.

If the sorce frequency duty cycle is smaller than 5.0%, the “UL”sign

will be shown on

The LCD display, and then, if the duty cycle is larger than 94.9%, the

“OL”sign will be shown on the LCD display.

NOTE: Input signal level must be higher than 0.7V (it is sensitivity).

5-6. DC uA/AC uA measurement

1. Set the rotary switch to the uA position.

2. Select the DC uA or AC uAwith “FUNC”push button. The meter

default to DC current measurement mode.

3. Turn off power to the circuit. Break the circuit point to be measured.

4. Connect the two test lead to complete the broken circuit.

5. If the measured current is too high, the display will indicate “OL”. In

this care, the higher current range (mA orA) should be selected.

5-7. DC/AC mA measurement

1. Turn off power to the circuit. Set the rotary switch to the mA position.

2. The meter default to DC current measurement mode. SelectAC mA

measurement mode by “FUNC”push button.

3. Break the current path to be tested. Connect the red test lead to the

Table des matières

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