Resistance Measurements; Continuity Check - Extech Instruments EX320 User Manual

RESISTANCE MEASUREMENTS

WARNING: 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.
Set the function switch to the  position.
1.
2. Insert the black test lead banana plug into the
negative COM jack.
Insert the red test lead banana plug into the
positive  jack.
3. Touch the test probe tips across the circuit or
component under test. It is best to disconnect
one side of the circuit under test so the rest of
the circuit will not interfere with the resistance
reading.
4. Read the resistance in the display.

CONTINUITY CHECK

WARNING: To avoid electric shock, never measure continuity on circuits or wires that
have voltage on them.
1. Set the function switch to the
2. Insert the black lead banana plug into the
negative COM jack.
3. Insert the red test lead banana plug into the
positive  jack.
Use the MODE button to view the icon on
4.
the display.
5. Touch the test probe tips to the circuit or
wire you wish to check.
6. If the resistance is less than approximately
100, the audible signal will sound. If the
circuit is 'open' (bad), the display will
indicate "OL".
position.
8
EX320-EU-ENG V5.1 6/09