A Ac/Dc Current Measurements - Extech Instruments EX350 User Manual

10A AC/DC Current Measurements
WARNING: Do not handle the test leads above the finger/hand guard barrier.
CAUTION: Observe CAT III 600V with respect to Earth Ground.
1. Insert the black test lead into the COM terminal and the red test lead into the A terminal.
2. Turn the meter's function switch to the
display indicating Amperes (Amps).
3. Press the M button to select AC or DC.
4. The meter defaults to the Auto Range mode. When in Auto mode, the display shows the
Auto icon. Press the R button to manually range the meter. Press the R button to step
through the ranges. Press and Hold the R button to return to the Auto Range mode.
5. Current measurements must be taken in series with the circuit under test. See
accompanying diagram.
6. Touch the black test lead to the negative side of the circuit and the red test lead to the
positive side of the circuit.
7. Read the current measurement in the display represented by numerical digits and bar
graph. The display will indicate the proper decimal point and value. In DC, If the polarity
is reversed, the display will show (‐) minus before the value.
8. For AC current, press the Hz/% button to view the frequency (Hz) or the duty cycle (%) of
the measured current.
% Duty Cycle Note: Duty Cycle measurements are
AC only for this meter. Measurement signals must
be 'zero crossing' and must reach ‐0.7V for the
meter to properly display Duty Cycle %.
Fig 4‐3 AC/DC 10A CURRENT MEASUREMENTS
position. The A symbol will appear on the
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