Extech Instruments 470 - Manual (Page 10)

V5.0 5/04 10
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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