Extech Instruments EX410 User Manual

EX410-EU_ENG V5.1 10/07 7
AC VOLTAGE MEASUREMENTS
WARNING: Risk of Electrocution. The probe tips may not be long enough to contact the
live parts inside some 240V outlets for appliances because the contacts are recessed
deep in the outlets. As a result, the reading may show 0 volts when the outlet actually has
voltage on it. Make sure the probe tips are touching the metal contacts inside the outlet
before assuming that no voltage is present.
CAUTION: Do not measure AC voltages if a motor on the circuit is being switched ON or
OFF. Large voltage surges may occur that can damage the meter.
1. Set the function switch to the highest V AC ( ) position.
2. Insert the black test lead banana plug into the negative COM
jack.
Insert red test lead banana plug into the positive V jack.
3. Touch the black test probe tip to the neutral side of the circuit.
Touch the red test probe tip to the “hot” side of the circuit.
4. Read the voltage in the display. Reset the function switch to
successively lower V AC positions to obtain a higher
resolution reading.
DC CURRENT MEASUREMENTS
CAUTION: Do not make current measurements on the 20A scale for longer than 30
seconds. Exceeding 30 seconds may cause damage to the meter and/or the test leads.
1. Insert the black test lead banana plug into the negative
COM jack.
2. For current measurements up to 200µA DC, set the
function switch to the 200µA DC ( )position and
insert the red test lead banana plug into the uA/mA
jack.
3. For current measurements up to 200mA DC, set the
function switch to the 200mA DC position and insert the
red test lead banana plug into the uA/(mA jack.
4. For current measurements up to 20A DC, set the
function switch to the 20A DC range and insert the red
test lead banana plug into the 20A jack.
5. Remove power from the circuit under test, then open up
the circuit at the point where you wish to measure
current.
6. Touch the black test probe tip to the negative side of
the circuit.
Touch the red test probe tip to the positive side of the
circuit.
7. Apply power to the circuit.
8. Read the current in the display.

Extech Instruments EX410 Specifications

General

Brand	Extech Instruments
Model	EX410
Category	Multimeter
Language	English