5
There are six ranges for measuring resistance 400ohm, 4Kohm, 40Kohm, 400Kohm, 4 M ohm, and 40Meg Ohms. For
more accurate measurements use the lowest range possible without exceeding the setting value.
when measuring resistance always make sure the power to the circuit is off.
1. Set the function/range switch to the appropriate resistance setting to measure
Ω
(ohms).
2. Insert the black (negative) test lead into the COM input terminal.
3. Insert the red (positive) test lead into the V
Ω
input terminal.
4. Touch the test leads to the resistor or non-energized component to be measured. Use the 20 M Ohm range when
testing for resistance values in electronic components such as resistors and potentiometers. If the value of the
component falls within the range of a lower setting, reset the function/range switch to that setting for a more accurate
reading.
5. Read the value of the measurement displayed. With resistance measurements, the polarity of the test leads is not a
factor.
6. Typical resistance/continuity measurements include resistors, potentiometers, switches, extension cords and fuses.
Note: The test leads can add 0.1
Ω
to 0.2
Ω
of error to the resistance measurement. To obtain precise readings while
using the 400k_ low impedance setting, touch the tips of the test probes together and press REL
∆
button first. Then
make the resistance measurement so that the normal resistance of the test leads is automatically removed from the
measurement.
4.5 CONTINUITY
WARNING
T o avoid damages to the Meter or to the devices under test, disconnect circuit power and discharge all the
high-voltage capacitors before measuring resistance.
WARNING
Do not input 60V DC or 30V AC to avoid personal harm.
1. Insert the red test lead into V
Ω
terminal and the black test lead into the COM terminal.
2. Set the function switch to
and press select button until appears.
3. Connect the test leads across the object being measured.
4. The buzzer sounds continuously if the resistance of a circuit under test is°‹10
Ω
, it indicates the circuit is in good
connection.
5. The buzzer does not sound if the resistance of a circuit under test is
≥
70
Ω
, which indicates a possible broken circuit.
6. Read the resistance value on the display.
Note:
The LCD displays “OL” to indicate the resistance of the circuit being tested is higher than 400
Ω
.
4.6 DIODE TESTING
Use the diode test to check diodes, transistors, and other semiconductor devices. The diode test sends a current through
the semiconductor junction, and then measures the voltage drop across the junction. A good silicon junction drops
between 0.5V and 0.8V.
To test out a diode while removed from a circuit, connect the meter as below :
1. Insert the black (negative) test lead into the COM input terminal.
2. Insert the red (positive) test lead into the V
Ω
input terminal.
3. Set the function switch to diode position “
“
4. For forward voltage drop readings on any semiconductor component, place the red test lead on the component’s anode
and place the black test lead on the component’s cathode.
5. Read the nearest value of the diode’s forward voltage drop as displayed.
