Extech Instruments Extech 470 User's Guide download pdf (Page 7)

EX470-EU-EN-V5.4-5/12

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 green V position.

2. Press the SELECT button to indicate “AC” on the display.

3. Insert the black test lead banana plug into the negative COM jack.

Insert red test lead banana plug into the positive V jack.

4. 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.

5. Read the voltage in the display.

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 4000µA DC, set the function

switch to the yellow µA position and insert the red test lead

banana plug into the µA/mA jack.

3. For current measurements up to 400mA DC, set the function

switch to the yellow mA position and insert the red test lead

banana plug into the µA/mA jack.

4. For current measurements up to 20A DC, set the function switch

to the yellow A range and insert the red test lead banana plug into

the A jack.

5. Press the SELECT button to indicate “DC” on the display.

6. Remove power from the circuit under test, then open up the circuit

at the point where you wish to measure current.

7. 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.

8. Apply power to the circuit.

9. Read the current in the display.

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Extech Instruments Extech 470 User's Guide Page 7

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Extech Instruments Extech 470 User's Guide Page 7

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