Extech Instruments 380900 User Manual page 6

Resistance and Continuity Measurements (Channel 1 only)
Note: When measuring resistance or continuity, Channel 2 is automatically disabled.
1. Insert the black test lead banana plug into the negative COM
jack and the red test lead banana plug into the Channel 1
V//mV/CAP/
2. Set the function switch to the "
3. Press the SHIFT key momentarily to select Continuity (if
required).
4. 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.
5. For Resistance tests, read the resistance on the display.
6. For Continuity tests, if the resistance is < 40 an audible tone will sound
Capacitance Measurements
Note: When measuring capacitance or diodes, Channel 2 is automatically disabled.
Note: If auto range is selected, the range is 6000 counts. If manual range is selected, the range is
extended to 9999 counts.
1. Insert the black lead into the negative COM jack and the red
test lead into the Channel 1 V//mV/CAP/
2. Set the function switch to the "CAP
3. Touch the test leads to the capacitor to be tested and read
the measured value.
Frequency and Duty Cycle Measurements
When measuring V, mV, A, mA, or µA, the measurement of
frequency and duty cycle can be displayed.
1. Select either CH1 or CH2 (as indicated by the ▼ icon) with
the CH1/CH2 key.
2. Press the Hz key and the frequency will appear in the lower
display and the duty cycle will appear in the upper display for
the channel selected.
3. Press the Hz key again to exit the function.
jack.
" position.
jack.
" position.
6 380900-EN v3.1 07/13