Extech Instruments 38394 User Manual page 6

Continuity Test
CAUTION: Before taking measurements, remove power from the circuit under test and
discharge all capacitors
Insert the black test lead to the COM input jack and the red test lead to the Ω input
1.
jack.
2. Set the Function switch to the •)))
3. Press the FUNC key until the "•)))" icon appears in the upper right-hand area of the
LCD display.
4. Connect the test lead tips to the device under test.
5. If the resistance is < 10Ω (approx.) a tone will sound.
Frequency Measurements
CAUTION: Before taking an in-circuit measurement, remove power from the circuit
under test and discharge all capacitors.
1. Insert the black test lead to the COM input jack and the red test lead to the VΩ
input jack.
2. Set the Function switch to the Hz position.
3. Connect the test lead tips to the device under test.
4. Read the measured value on the LCD display.
Diode Test
CAUTION: Before taking measurements, remove power from the circuit under test and
discharge all capacitors
1. Insert the black test lead to the COM input jack and the red test lead to the V/Ω
input jack
2. Set the Function switch to the •)))
3. Press the FUNC key until the
LCD.
4. Connect the test lead tips to the device to be measured
5. Note the displayed reading
6. Reverse the test lead polarity by swapping the red and black lead connection; note
this reading also.
a. If one reading displays a value and the other reading displays "OL", the
diode is good
b. If both readings display "OL", the device is open
c. If both readings are very small or zero, the device is shorted
Ω position.
Ω position
icon appears in the upper right-hand side of the
6
38394 V3.3 8/08
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