Dc Current Measurements - PICO TA467 User Manual

TA467 Insulation Tester User's Guide

DC current measurements

4.2.5.
Risk of electrocution! The probe tips may not be long enough to reach the live parts inside some
240 V 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 a voltage on it. Make sure that the
probe tips are touching the metal contacts inside the outlet before you assume that there is no
voltage present.
Do not capture 20 A current measurements for more than 30 seconds. Exceeding 30 seconds
may cause damage to the unit and/or to the test leads.
1. Insert the black test lead into the COM jack (negative).
2. Set the function switch to the required position and connect
the red test lead:
a. For current measurements up to 4000 µA DC: Set the
function switch to the µA position and insert the red test
lead into the µA mA jack.
b. For current measurements up to 400 mA DC: Set the
function switch to the mA position and insert the red test
lead into the µA mA jack.
c. For current measurements up to 20 A DC: Set the function
switch to the 10A position and insert the red test lead into
the 10A jack.
3. Press the MODE button to switch to DC on the display.
4. Remove power from the circuit under test.
5. Open up the circuit at the point where you want to measure the
current.
6. Touch the black test probe tip to the negative side of the circuit
and 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.
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WARNING
CAUTION
DO341-1