Diode Test; Continuity Check; Resistance Measurement - protech QM1527 Manual

DIODE TEST & CONTINUITY CHECK
To avoid electric shock - disconnect power to the unit under test and
discharge all capacitors before taking the diode test, and never measure
continuity on circuits of wires that have voltage on them. In a circuit, a
good diode should produce a forward bias reading of voltage. However,
the reverse-bias reading can be variable based on the resistance of other
pathways between the probe tips.

DIODE TEST

1) Set the rotary switch to the
2) Insert the black test lead banana plug into the negative COM jack.
3) Insert the red test lead banana plug into the positive VΩmA jack.
4) Place the red test lead on the anode of diode and black test lead on
the cathode of the diode. The meter will show the approx. forward
voltage of the diode. Reverse voltage will indicate OL.

CONTINUITY CHECK

Touch the test probe tips to the circuit or wire you wish to check. The
maximum value of resistance under check will appear on the screen. If
the resistance is less than 30Ω, the audible signal will sound.

RESISTANCE MEASUREMENT

To avoid electric shock - disconnect power to the unit under test and
discharge all capacitors before taking any resistance measurements.
Remove the batteries and unplug the line cords. The measured value
of a resistor in a circuit is usually different from the rated value of a
resistor. This is because the test current of the meter flows through
all possible paths between the probe tips. In order to ensure the best
accuracy when measuring low resistance, short the test leads before the
measurement and subtract this resistance value from the total. For high
resistance measurements, the meter may take a few seconds to stabilise
the readings. In an open circuit, the meter will display OL to indicate over
range.
1) Set the rotary switch to the Ω position.
2) Insert the black test lead banana plug into the negative COM jack.
3) Insert the red test lead banana plug into the positive VΩmA jack.
position.
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