Continuity Check - Forch F72 Bedienungsanleitung

■
For high-resistance measurement (>10MΩ), it is normal taking several second to obtain
stable reading.
■ The LCD display "OL" indicating open-circuit for the tested resistor or the resistor value
is higher than the maximum range of the meter.
5.3. Diode/Continuity check
5.3.1. Diode
■
Set the rotary switch to "
You can enter the continuity check mode by the " FUNC" Key.
■ Insert the red test lead into the "VΩ" terminal and the black test lead into the "COM"
terminal.
■ 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.
■ 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.
■
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 in both direction.
■
If display shows "OL" in both direction, the diode is open.

5.3.2. Continuity Check:

■
Press the "FUNC" key to enter to the continuity mode.
■
The buzzer sound if the resistance of a circuit under test is less than 100Ω.
5.4. DC/AC µA or mA measurement
DC Current range is 200.0µA/2000µA and 20.00mA,/200.0mA and then 10A range.
AC Current range is 200.0µA/2000µA and 20.00mA,/200.0mA and then 10A range.
■
Turn off power to the circuit. Set the rotary switch to the properDC/AC µA or DC/AC mA
position.
■
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.
■
Turn on power to the circuit. The measured value show on the display.
5.5. DC/AC 10A measurement
■ Insert the red test lead into the input terminal marked as "10A".
■ 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.
" position. First time, default mode is diode check mode.