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.
“VmA” 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℃(64F to 82F) 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
100V
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
200A
0.1A
1% of rdg 2 digits
2mA
1A
1% of rdg 2 digits
20mA
10A
1% of rdg 2 digits
200mA
100A
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 1.5k), 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=10A
Vce=3V
OPERATING INSTRUCTIONS
DC VOLTAGE MEASUREMENT
1.
2.
3.
4.
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
1.
2.
3.
4.
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
1.
2.
3.
4.
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
1.
2.
3.
4.
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
1.
2.
3.
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
1.
2.
3.
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 10A and Vce 3V.
-7-
NOTE:
To avoid electrical shock, remove test leads from measurement circuits before testing a transistor.
AUDIBLE CONTINUITY TEST
1.
2.
3.
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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