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5.3 RESISTANCE/CONTINUITY/DIODE
Resistance
When measuring resistance always make sure the power to the circuit is off.
1. Insert the black (negative) test lead into the
COM input terminal.
2. Insert the red (positive) test lead into the
INPUT terminal to the right of the COM terminal.
3. Set the Rotary Switch to
4. Press the “
SELECT” button until *insert resistance symbol* is shown on the display.
5. Touch the test leads to the resistor or non-energized component to be measured.
6. Read the value of the measurement displayed. With resistance measurements, the polarity of the test leads is not a factor.
7. Typical resistance measurements include resistors, potentiometers, switches, extension cords and fuses.
Note: For measurements > 1M
Ω
, the meter may take a few seconds to stabilize reading. This is normal for high
resistance measurements. When the input is not connected, i.e. at open circuit, “ OL” will be displayed as an overrange indication.
Continuity
To avoid damages to the Meter or to the devices under test, disconnect circuit power and discharge all
the high-voltage capacitors before measuring resistance.
Do not input 60V DC or 30V AC to avoid personal harm. Do not use on energized circuits.
1. Insert the black (negative) test lead into the
COM input terminal.
2. Insert the red (positive) test lead into the
INPUT terminal to the right of the COM terminal.
3. Set the Rotary Switch to
4. Press the “
SELECT” button until is shown on the display.
5. Connect the test leads across with the object being measured.
6. The buzzer sounds continuously if the resistance of a circuit under test is <~30
Ω
. It indicates the circuit connection is good.
7. The buzzer does not sound if the resistance of a circuit under test is >100
Ω
. It indicates a possible broken circuit.
8. The buzzer may or may not sound if the resistance of a circuit under test is 30
Ω
-100
Ω
.
9. Read the resistance value on the display.
10. Typical continuity measurements include switches, extension cords and fuses.
Note: Open circuit voltage is around 2.2V. When the input is not connected, i.e. at open circuit,
“ OL” will be displayed as an overrange indication.
Diode
1. Insert the black (negative) test lead into the COM input terminal.
2. Insert the red (positive) test lead into the INPUT terminal to the right of the COM terminal.
3. Set the Rotary Switch to
symbol.
4. Press the “
SELECT” button until
is shown on the display.
5. 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.
6. Read the resistance value on the display.
Note: When measuring resistance, the circuit should be powered off and all capacitors should be completely discharged
prior to testing. A more accurate measurement can be achieved by separating the component from the circuit being tested.
When the test leads are not connected or are reversed, the display will show an over-range symbol “OL”.
5.4 FREQUENCY/DUTY CYCLE
Frequency
Hz
1. Insert the black (negative) test lead into the COM input terminal.
2. Insert the red (positive) test lead into the INPUT terminal to the right of the COM terminal.
3. Set the Rotary Switch to Hz%
4. Press the “
SELECT” button until Hz is shown on the display.
5. Place the red and black test leads at both the positive and negative points to be measured.
6. Read the value of the measurement displayed.
Note: The voltage of the input signal should be between 1V rms and 20V rms. The higher the frequency of the signal, the higher the required
input voltage. For measurements < 10Hz, the amplitude of the input signal must be more than 2V rms.
Duty Cycle
%
1. Insert the black (negative) test lead into the COM input terminal.
2. Insert the red (positive) test lead into the INPUT terminal to the right of the COM terminal.
3. Set the Rotary Switch to Hz%
4. Press the “
SELECT” button until % is shown on the display.
5. Place the red and black test leads at both the positive and negative points to be measured.
6. Read the value of the measurement displayed.
Note: The voltage of the input signal should be between 4Vp-p and 10Vp-p. After removing the leads from the object being measure, the
reading may still remain on the display. Pressing the
SELECT button twice in a row will zero the display.
