Diode Test; Auto-Manual Range Selection; Max Mode - Extech Instruments EX320 User Manual

DIODE TEST

1. Set the function switch to the
2. Insert the black test lead banana plug into the
negative COM jack and the red test lead
banana plug into the positive
3. Use the MODE button to view the
the display.
4. Touch the test probes to the diode under test.
Forward voltage will typically indicate 0.400 to
0.700V. Reverse voltage will indicate "OL".
Shorted devices will indicate near 0V and an
open device will indicate "OL" in both polarities.

AUTO-MANUAL RANGE SELECTION

When the meter is first turned on, it automatically goes into the Auto Range mode. This
automatically selects the best range for the measurements being made and is generally
the best mode for most measurements. For measurement situations requiring that a range
be manually selected, perform the following:
1. Press the RANGE key. The AUTO display indicator will turn off.
2. Press RANGE to step through the available ranges until the desired range is
selected.
3. To exit the Manual Ranging mode and return to Auto Range mode, press and hold
the RANGE key for 2 seconds.

MAX MODE

Press the MAX button (the MAX icon will appear on the LCD). The meter will now only
display the highest reading during a test. Each time a higher reading is encountered, the
display will update. Press the MAX button again to exit this mode.
position.
jack.
icon on
8 Model EX320 - Version 4.0 –05/2006