Resistance Measurement; Continuity Test; Diode Test; Logic Test - Extech Instruments 381626 User Manual

Resistance Measurement

1. Connect the black test lead to the COM jack.
2. Set the Function Switch to the Ω position.
3. Connect the positive test probe and the black test
across the resistance to be measured.
Note: 1) The polarity of the positive test probe is "+".
2) When checking in-circuit resistance, be sure all
power is removed from the circuit under test and
all capacitors are fully discharged.

Continuity Test

1. Connect the black test lead to the COM jack.
2. Set the Function Switch to the
select with button 3.
3. Connect the positive test probe and the black test lead
to the circuit. If the resistance is less than
approximately 20Ω the buzzer will sound.
Note: The polarity of the positive test probe is "+"

Diode Test

1. Connect the black test lead to the COM jack.
2. Set the Function Switch to the
3. Connect the positive test probe and the black test lead

Logic Test

1. Connect the black test lead to the COM jack.
2. Set the Function Switch to the L position
3. Connect the black test lead to the common terminal of
/ position and
select with Button(3)
across the diode under test. If the positive test probe is
placed on the anode of the diode, the display will
indicate the approximate forward voltage drop of the
diode.
the circuit to be tested Connect the test probe to the
point to be tested.
a) If the measured voltage is below the low reference
threshold the GREEN led will light, indicating a logic
"0".
b) If the measured voltage is above the high reference
threshold the RED led will light, indicating a logic "1".
c) If the measured voltage is between the reference
thresholds, neither led will light.
/ position and