Mastech MS8228, Operation Manual, Page: 13 / 26

DIGITAL MULTIMETER
SPECIFICATION NTS
3.2.13 Luminance
（
Lux
）
Range Resolution Accuracy
Lux (4000) 1 Lux
±
（
5.0% of r 10 digits
）
at color temp. 2856K
calibrated to standard
incandescent lamp
×10Lux
(40000) 10Lux
- Repeatability: ±2%.
3.2.14 Diode Test
Range Resolution Function
1mV displaying approximate
forward voltage of diode
- Forward DC current ~1mA
- Reversed DC voltage ~1.5V
- Overload Protection: 250V DC or rms AC
3.2.15 Transistor hFE
Range Function
hFE Displaying approximate hFE value 1-1000 β
for transistor under test (ALL TYPE)
- Base current: ~10
µ
A
，
Vce: ~2V
- Overload protection: resettable fuses F1 500mA/250V.
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DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
4. 4. 4. 4. OPERATING OPERATING OPERATING OPERATING INSTRUCTION INSTRUCTION INSTRUCTION INSTRUCTION
4. 4. 4. 4.1 1 1 1 MISCONNECTION MISCONNECTION MISCONNECTION MISCONNECTION ALARM ALARM ALARM ALARM
The input jacks of the meter are equipped with sound and
light alarms against misconnection of test leads.
4.1.1 At V
、
Ω
、
Hz
、
Duty
、 、
ranges:
1
）
The red lights at the “IN” and “COM” jacks will be off
after the test leads are plugged in.
2
）
The buzzer will sound upon misconnection of the test
leads in the “mA” or “10A” jacks to warn the user. At
the same time, the lights at the “IN” and “COM” jacks
will flash to remind the user to plug in the test leads
there.
4.1.2 At μA
、
mA, hFE ranges
：
1
）
The red lights at the “mA” and “COM” jacks will be off
after the test leads are plugged in.
2
）
The buzzer will sound upon misconnection of the test
leads in the “IN” or “10A” jacks to warn the user. At
the same time, the red lights at the “mA” and “COM”
jacks will flash to remind the user to plug in the test
leads there.
4.1.3 At 10A range
：
1) The red lights at the “10A” and “COM” jacks will be off
after the test leads are plugged in.
2) The buzzer will sound upon misconnection of the test
leads in the “IN” or “mA” jacks to warn the user.
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