Resistance Measurement; Diode And Continuity Test - Velleman DVM040 User Manual

10.3 RESISTANCE MEASUREMENT

Do not conduct resistance measurements on live circuits. Make sure
all capacitors in the circuit are depleted. Remove the batteries and
unplug the line cords.
1. Set the rotary switch to the desired resistance (Ω) range.
2. Insert the black test lead banana plug into the negative COM jack,
insert the red test lead banana plug into the positive "°C/°F V
Hz % mF" jack.
3. Touch the test probe tips across the circuit or part under test. It is best
to disconnect one side of the part under test so the rest of the circuit
will not interfere with the resistance reading.
4. Read the resistance in the LCD display
Notes
• The measured value of a resistor in a circuit usually is different from the
rated value of resistor, it because the test current of the meter flows
through all possible paths between the probe tips.
• In order to ensure the best accuracy in measurement of low resistance,
connect both test leads before the measurement and subtract this
resistance value of the test leads.
• For high resistance measurement, the meter may take a few seconds to
stabilize the readings.
• In the open circuit, the meter display OL to indicate the over range

10.4 DIODE AND CONTINUITY TEST

Do not conduct diode or continuity measurements on live circuits.
Make sure all capacitors in the circuit are depleted.
1. Set the rotary switch to
2. Insert the black test lead banana plug into the negative COM jack,
insert the red test lead banana plug into the positive "°C/°F V
Hz % mF" jack.
3. Place the red test lead on the anode of diode and black test lead on the
cathode of diode, the meter will show the approx. forward voltage of
diode, reverse voltage will indicate OL.
4. Touch the test probe tips to the circuit or wire you wish to check, the
max. value of resistance under check will be showed in display, if the
resistance is less than 100Ω, the audible signal will sound.
V. 01 – 04/05/2023
DVM040
position
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