Mastech MS8233E, Руководство пользователя, Страница: 9 / 11

5-3. Diode/Continuity check
①
Set the rotary switch to “
” position. First time, default
mode is diode check mode. You can enter the continuity check mode
by the “ FUNC” Key.
②
insert the red test lead into the
“V
Ω ”
terminal and the black test lead
into the “COM” terminal.
③
Use the diode test mode to check diodes, transistors and other
semiconductor device. In the diode test mode sends a current through
the semiconductor junction, and the measure the voltage drop across
the junction. A good silicon junction drop between 0.5V and 0.8V.
④
For forward voltage drop reading on any semiconductor component,
place the red test lead on the component anode and place the black test
lead on the component cathode. The measured value show on the
display.
⑤
Reverse the test lead and measure the voltage across the diode again.

If diode is good, the display shows “OL”.

If diode is shorted, the display shows 0 (zero) in both direction.

If display shows “OL” in both direction, the diode is open.
Continuity Check: Press the “FUNC” key to enter to the continuity
mode.
⑥
The buzzer sound if the resistance of a circuit under test is less than
100
Ω
.
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.
NOTE: Input signal level must be higher than 0.5V (it is sensitivity).
5-4. DC/AC
µ
A or mA measurement
DC Current range is 200.0
µ
A/2000
µ
A and 20.00mA,/200.0mA and
then 10A range.
AC Current range is 200.0
µ
A/2000
µ
A and 20.00mA,/200.0mA and
then 10A range.
1. Turn off power to the circuit. Set the rotary switch to the
properDC/AC
µ
A or DC/AC mA position.
2. Break the current path to be tested. Connect the red test lead to the
more positive side of the break and the black test lead to the more
negative side of the break.
3. Turn on power to the circuit. The measured value show on the display.
5-5. DC/AC 10A measurement
1. Insert the red test lead into the input terminal marked as “10A”.
2. The measuring procedure is same as that of 5-5 section..
Note:

For safety’s sake, the measuring time for high current should be
≤
10 second for each measurement and the interval time between
two measurement should be greater than 5 minutes.

When current measurement has been completed, disconnect the
connection between the testing lead and the circuit under test.
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