Mastech MAS838 Assembly instructions

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OPERATOR’S

INSTRUCTION MANUAL

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.

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 category Ⅱ

installations.

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 handheld 31/2 digital multimeter for measuring

DC and AC voltage, DC current, Resistance, Diode, Transistor,

Temperature and Continuity Test with battery operated.

-2-

FRONT PANEL

-3-

FRONT PANEL DESCRIPTION

Display

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

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 or plug in

the black plug with “k” type thermocouple.

“VΩmA” jack

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

resistance and current (except 10A) measurements or

plug in the red plug with “k” type thermocouple.

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℃

Storage temperature :-10℃to 50℃.

-4-

Low battery indication :“ ”appears on the display

Size :138mm×69mm×31mm

Weight : Approx.170g.

DC VOLTAGE

Range Resolution Accuracy

200mV 100μV ±0.5% of rdg ±2 digits

2V 1mV ±0.5% of rdg ±2 digits

20V 10mV ±0.5% of rdg ±2 digits

200V 100mV ±0.5% of rdg ±2 digits

600V 1V ±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

2mA 1μA ±1% of rdg ±2 digits

20mA 10μA ±1% of rdg ±2 digits

200mA 100μA ±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 1V ±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 1.5kΩ), built-in

buzzer will sound.

Show the approx. forward voltage drop of the diode.

Overload Protection:250V dc or rms. ac.

-5-

TRANSISTOR hFE TEST (0-1000)

Range Test Range Test Current Test Voltage

NPN & PNP 0-1000 Ib=10μA Vce=3V

RESISTANCE

Range Resolution Accuracy

200Ω0.1Ω±0.8% of rdg ±3 digits

2kΩ1Ω±0.8% of rdg ±2 digits

20kΩ10Ω±0.8% of rdg ±2 digits

200kΩ100Ω±0.8% of rdg ±2 digits

2MΩ1kΩ±1.0% of rdg ±2 digits

Maximum Open Circuit Voltage: 3.2V

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

TEMPERATURE

Range Resolution Test Range Accuracy

℃

1℃-20℃to 0℃

-0℃to 400℃

400℃to 1000℃

±10% of rdg ±2digits

±1.0% of rdg ±3digits

±2.0% of rdg

TEMPERATURE

Range Resolution Test Range Accuracy

°F

1 °F -4°F to 32°F

32°F to 752°F

752°F to 1832°F

±10% of rdg ±2digits

±1.0% of rdg ±3digits

±2.0% of rdg

OPERATING INSTRUCTIONS

DC VOLTAGE MEASUREMENT

Connect the red test lead to the “V.Ω.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.

-6-

DC CURRENT MEASUREMENT

Connect the red test lead to the “V.Ω.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.

AC VOLTAGE MEASUREMENT

Connect the red test lead to “V.Ω. 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.

DIODE TEST

Connect the red test lead to “V.Ω.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 10μA and Vce 3V.

-7-

RESISTANCE MEASUREMENT

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

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

positive “+”.)

Set the rotary switch at desired ”Ω” 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.

AUDIBLE CONTINUITY TEST

Connect red test lead to “V.Ω.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.

MEASURING TEMPERATURE

If the meter is the ℃function, set the rotary switch at

℃. Position. If it is the °F function, set the rotary switch

at °F Position. The LCD display will show the current

environment temperature.

Connect the red lead of“K ”type thermocouple into

the “V.Ω.mA” jack and the black lead of“K ”type

thermocouple into the “COM” jack.

Read temperature value on the LCD display.

WARNING:

To avoid electric shock, be sure the thermocouple has been

removed before changing to another function measurement.

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

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