Mastech MAS830L Assembly instructions

OPERATOR’S

INSTRUCTION MANUAL

MAS830

MAS830L

DIGITAL MULTIMETER

SAFETY INFORMATION

This multimeter has been designed according to IEC



1010 concerning electronic measuring

instruments with an overvoltage category (CATⅡ) and pollution 2.

Follow all safety and operating instructions to ensure that the meter is used safely and is kept in

good operating condition.

Full compliance with safety standards can be guaranteed only with test leads supplied. If necessary,

they must be replaced with the type specified in this manual.

SAFETY SYMBOLS

Important safety information, refer to the operating

manual.

Dangerous voltage may be present.

Earth ground.

Double insulation (Protection class II).

Fuse must be replaced with rating specified in the

manual.

CAT II

Measurement category II, it is for measurements

performed on circuits directly connected to the low

voltage installation.

MAINTENANCE



Before opening the case, always disconnect test leads from

all energized circuits.

For continue protection against fire; replace fuse only with

the specified voltage and current ratings:

F 200mA/250V(Quick Acting)

Never use the meter unless the back cover is in place and

fastened completely.

Do not use abrasives or solvents on the meter. To clean it

using a damp cloth and mild detergent only.

-1-

DURING USE



Never exceed the protection limit values indicated in

specifications for each range of measurement.

When the meter is linked to measurement circuit, do not

touch unused terminals.

Never use the meter to measure voltages that might exceed

600V above earth ground in categoryⅡinstallations.

When the value scale to be measured is unknown beforehand,

set the range selector at the highest position.

Before rotating the range selector to change functions,

disconnect test leads from the circuit under test.

When carrying out measurements on TV or switching power

circuits always remember that there may be high amplitude

voltages pulses at test points, which can damage the meter.

Always is careful when working with voltages above 60V dc or

30V ac rms. Keep fingers behind the probe barriers while

measuring.

Before attempting to insert transistors for testing, always be

sure that test leads have been disconnected from any

measurement circuits.

Components should not be connected to the hFE socket when

making voltage measurements with test leads.

Never perform resistance measurements on live circuits.

GENERAL DESCRIPTION

The meter is a portable 31/2 digital multimeter for measuring DC and AC voltage, DC current,

Resistance, Diode, Transistor and Continuity Test with battery operated.

The Back light of display is optional.

-2-

FRONT PANEL

-3-

FRONT PANEL DESCRIPTION















Display

3 1/2 digit, 7 segment, 15mm high LCD.

Back light (ONLY MAS830L)

When this button is pushed, the Back light of display is on.

After about 5 seconds, the Back light is self-off. The Back

light is on again, just push this button once.

Rotary switch

This switch is used to select functions and desired ranges as

well as to turn on/off the meter.

Hold button

When this button is pushed, the display will keep the last

reading and “ ” symbol will appear on the LCD until

pushing it again.

“10A” jack

Plug in connector for red test lead for 10A measurement.

“COM” jack

Plug in connector for black (negative) test lead.

“VmA” jack

Plug in connector for red (positive) test lead for voltage,

resistance and current (except 10A) measurements.

SPECIFICATIONS

Accuracy is specified for a period of one year after calibration and at 18 to 28℃(64F to 82F) with

relative humidity to 80%.

GENERAL

Maximum voltage between

terminals and earth ground

:CATⅡ600V

Fuse protection

:F 200mA/250V

Power

:9V battery, NEDA 1604 or 6F22

Display

: LCD, 1999 counts, updates 2-3/ sec.

Measuring method

:Dual-slope integration A/D

converter

Overrange Indication

:Only figure “1” on the display

Polarity indication

:“-”displayed for negative polarity

Operating Environment

:0 to 40℃

-4-

Storage temperature

:-10℃to 50℃.

Low battery indication

:“ ”appears on the display

Size

:138mm×69mm×31mm

Weight

: Approx.170g.

DC VOLTAGE

Range

Resolution

Accuracy

200mV

100V

0.5% of rdg 2 digits

1mV

0.5% of rdg 2 digits

20V

10mV

0.5% of rdg 2 digits

200V

100mV

0.5% of rdg 2 digits

600V

0.8% of rdg 2 digits

Overload Protection: 250V rms. For 200mV range and 600V dc or rms. ac for other ranges.

DC CURRENT

Range

Resolution

Accuracy

200A

0.1A

1% of rdg 2 digits

2mA

1A

1% of rdg 2 digits

20mA

10A

1% of rdg 2 digits

200mA

100A

1.5% of rdg 2 digits

10A

10mA

3% of rdg 2 digits

Overload Protection: F 200mA/250V fuse. (10A range unfused)

AC VOLTAGE

Range

Resolution

Accuracy

200V

100mV

1.2 % of rdg 10 digits

600V

1.2 % of rdg 10 digits

Overload Protection: 600V dc or rms. ac for all ranges.

Frequency range: 40Hz to 400Hz. Response: Average responding, calibrated in rms. of a sine

wave.

DIODE & CONTINUITY

Range

Description

If continuity exists (about less than 1.5k), built-in buzzer

will sound.

Show the approx. forward voltage drop of the diode.

-5-

Overload Protection:250V dc or rms. ac.

RESISTANCE

Range

Resolution

Accuracy

200

0.1

0.8% of rdg 3 digits

2k

1

0.8% of rdg 2 digits

20k

10

0.8% of rdg 2 digits

200k

100

0.8% of rdg 2 digits

2M

1k

1.0% of rdg 2 digits

Maximum Open Circuit Voltage: 3.2V

Overload Protection:250V dc or rms. ac for all ranges.

TRANSISTOR hFE TEST (0-1000)

Range

Test Range

Test Current

Test Voltage

NPN & PNP

0-1000

Ib=10A

Vce=3V

OPERATING INSTRUCTIONS

DC VOLTAGE MEASUREMENT

Connect the red test lead to the “V..mA” jack and the black

lead to the “COM” jack.

Set rotary switch at desired DCV position. If the voltage to be

measured is not known beforehand, set range switch at the

highest range position and then reduce it until satisfactory

resolution is obtained.

Connect test leads across the source or load being measured.

Read voltage value on the LCD display along with the polarity

of the red lead connection.

DC CURRENT MEASUREMENT

Connect the red test lead to the “V..mA” jack and the black

test lead to “COM” jack. (For measurements between 200mA

and 10A, remove red lead to“10A” jack.)

Set the rotary switch at desired DCA position.

Open the circuit in which the current is to be measured, and

connect test leads in series with the circuit.

Read current value on LCD display along with the polarity of

red lead connection.

-6-

AC VOLTAGE MEASUREMENT

Connect the red test lead to “V. . mA” jack and the black

test lead to the “COM” jack.

Set the rotary switch at desired ACV position.

Connect test leads across the source or load being measured.

Read voltage value on the LCD display.

RESISTANCE MEASUREMENT

Connect the red test lead to “V. . mA” jack and black test

lead to the “COM” jack. (The polarity of red lead is positive

“+”.)

Set the rotary switch at desired ”” range position.

Connect test leads across the resistor to be measured and

read LCD display.

If the resistance being measured is connected to a circuit ，

turn off power and discharge all capacitors before applying

test probes.

DIODE TEST

Connect the red test lead to “V..mA” jack and the black test

lead to the “COM” jack (The polarity of red lead is positive

“+”.).

Set the rotary switch at “ ” position.

Connect the red test lead to the anode of the diode to be

tested and the black test lead to the cathode of the diode.

The approx. forward voltage drop of the diode will be

displayed. If the connection is reversed，only figure “1” will be

shown.

TRANSISTOR TEST

Set the rotary switch at “hFE” position.

Determine whether the transistor under testing is NPN or

PNP and locate the emitter，base and collector leads. Insert

the leads into proper holes of the hFE socket on the front

panel.

Read the approximate hFE value at the test condition of base

current 10A and Vce 3V.

-7-

NOTE:

To avoid electrical shock, remove test leads from measurement circuits before testing a transistor.

AUDIBLE CONTINUITY TEST

Connect red test lead to “V..mA”, black test lead to “COM”.

Set range switch to “ ” position.

Connect test leads to two points of circuit to be tested. If

continuity exists, built-in buzzer will sound.

BATTERY & FUSE REPLACEMENT

If “ ”appears on display, it indicates that the battery should be replaced.

Fuse rarely need replacement and blow almost always as a result of operator’s error.

To replace battery



fuse (200mA/250V) remove the 2 screws in the bottom of the case. Simply

remove the old, and replace with a new one.

Be careful to observe battery polarity.

WARNING

Before attempting to open the case, always be sure that test leads have been disconnected from

measurement circuits. Close case and tighten screws completely before using the meter to avoid

electrical shock hazard.

ACCESSORIES



Operator’s instruction manual



Set of test leads



Gift box



9 volt battery. NEDA 1604 6F22 006P type



Holster (option)

-8-

CAUTION:

Using this appliance in an environment with a strong radiated radio-frequency electromagnetic field

(approximately 3V/m), may influence its measuring accuracy. The measuring result can be strongly

deviating from the actual value.

If there is any cracking or break shown on the enclosure or cable please do stop use it.

Never use the meter to measure current if the circult to be measured might contain voltage

exceeding 250V.

PRECISION MASTECH ENTERPRISES CO.

Room 1708-09, Hewlett Centre, 54 Hoi Yuen Road, Kwun Tong,

Kowloon, Hong Kong.

Tel: 852-23430007

Fax:852-23436217

E-mail: info@p-mastech.com

SHENZHEN HUAYI MASTECH CO., LTD.

East Wing, 8/F., Block 4, Saige Science and Technology Industrial Garden, Hua Qiang Bei Rd.

Shenzhen

Tel: 0755-83769588

Fax: 0755- 83768150

E-mail: info@mastech.com.cn

DONGGUAN HUAYI MASTECH CO., LTD.

Yulianwei Industrial Area, Qingxi Town, Dongguan, China

Tel: 0769-7318228

Fax: 0769-7318225



HYS004608 A1

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