Mastech MAS830L Operator's Instruction Manual

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
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 10A and Vce 3V.
-7-

Mastech MAS830L Specifications

General

DC Voltage Range	200mV/2V/20V/200V/600V
AC Voltage Range	200V/600V
Resistance Range	200Ω/2kΩ/20kΩ/200kΩ/2MΩ
Continuity Buzzer	Yes
Diode Test	Yes
Transistor Test	Yes
Power Supply	9V battery
Display	LCD
DC Current Range	200μA/2mA/20mA/200mA/10A
Dimensions	138mm x 69mm x 31mm