Resistance; Continuity/Diode Test; Hfe Transistor Gain; Operating Instructions - Mastech MS8321A Manual

3.2.5 Resistance

Measuring range
Resolution
200Ω 0.1Ω
1Ω
2kΩ
20kΩ 10Ω
200kΩ 100Ω
2MΩ 1kΩ
20MΩ 10kΩ
Overload Protection: 250V DC or AC rms; do not exceed
15 sec. continuous measurement.

3.2.6 Continuity/Diode Test

Function
If measured resistance
is less than 50Ω, the
buzzer will sound.
The display shows the
approx. forward
voltage drop
Overload Protection: 250V DC or AC rms; do not exceed
15 sec. continuous measurement.

3.2.7 hFE Transistor Gain

Function
Displays approx.
hFE hFE transistor gain
(0-1000)
Accuracy
±(1.0% of reading +3 digits)
±(1.0% of reading +1 digits)
±(1.0% of reading +5 digits)
Description
Open circuit voltage:
approx. 2.8V
Forward DC current:
approx. 1mA
Reverse DC voltage:
approx. 2.8V
Description
Base current: approx.
10µA
Vce: approx. 2.8V
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4. Operating Instructions

4.1 DC/AC Voltage

Warning
Max. input voltage: 600V DC or AC rms (200mV
range is 250V DC or AC rms).
Do not exceed the protection limits to prevent
electric shock and/or damage to the meter.
• Turn the rotary switch to the proper voltage range.
• Connect the red test lead to the V input jack and the black
test lead to the COM jack.
• Connect the leads to the voltage source or circuit under test.
• Read the measured voltage on the display.When measuring
DC voltage, the display will show the polarity of the red lead.
• If the display only shows "1", it indicates the input exceeds
the selected range.Move the rotary switch to a higher range.
4.2 Resistance
Warning
Turn off all power and discharge all capacitors
completely before making resistance
measurements.
Turn the rotary switch to the proper voltage range.
•
• Connect the red test lead to the Ω input jack and the
black test lead to the COM jack.
• Connect the leads to the resistance or circuit under test
and read the measured resistance on the display.
When measuring low resistances, short the test leads
•
and record the measurement.Then connect the leads to
the resistance to be measured and subtract the shorted
resistance.
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