Mastech MS8221C User Manual

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3.2.10 Diode
3.2.12 Transistor hFE
Range
Resolution Function
Display :read approximate
forward voltage of diode
1mV
- Forward DC Current: approx. 1mA
- Reversed DC Voltage: approx.1.5V
- Overload Protection: 250V DC or AC rms
3.2.11 Continuity
Range
Function
Built-in buzzer will sound, if resistance
is lower than 50Ω.
- Open circuit voltage: approx. 0.5V
- Overload Protection: 250V DC or AC rms
Range
Function
Display: read approximate hFE value
(0-1000) of transistor under test (ALL TYPE)
- Base Current: approx. 2μA,
Vce: approx. 1V
-Overload Protection: F 200mA/250V fuse (quick acting)
4. Operating Instruction
4.1 Power-UP
Press the ‘ON/OFF’ button to turn the meter ON or OFF.
4.2 Data Hold
If you need data hold when measuring, you can put on
‘DATA-H’ button, it will hold the reading; if you put the
button again, data hold is not continue.
hFE
4.5 Range Transform
The auto range is used when measuring the current,
voltage, capacitance and resistance. Put down the ‘RANGE’
if the manual range is needed. Each time you put down,
range will go upward; the minimum range is transformed
if ‘RANGE’ is put down at the maximum range. If the
‘RANGE’ is put down more than two seconds, auto range
is used again.
4.6 Back Light
If the light is dark to make the reading difficult when
measuring, you can press ‘ ’ button to turn on the back
light, which will last for 15 seconds. Continuous pressing
the button for two seconds will turn off the back light.
Note:
LED is the main source of back light. Its working current
is large, although the meter has the timer equipment
(time is 15 seconds and it will off automatically after 15
seconds); often use back light will shorten the battery
life, you'd better not to use the back light so frequently if
it's not necessary.
4.3 Maximum Value Hold
If you need data hold when measuring, you can put on
‘MAX.H’ button, it will hold the maximum value; if you
put the button again, maximum value hold is not continue.
4.4 Function Transform
Put down the ‘FUNC.’ when measuring the current and
voltage. Meter will be transformed between DC and AC
range. Put 'FUNC.' when measuring the temperature,
meter will transform between ˚Cand ˚F range. Put ‘FUNC.’
when measuring the diode and continuity, meter will
transform among them.

Mastech MS8221C Specifications

General

Brand	Mastech
Model	MS8221C
Category	Multimeter
Language	English