EX623-en-GB_v3.0 4/15
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AC/DC Current Measurements
WARNING: Disconnect the test leads before making clamp measurements.
1. Rotate the Function switch to the 400A
AC/DC
position
2. Press the MODE button to select AC or DC.
3. Press the trigger to open jaw. Fully enclose
only one conductor.
4. Read the current value in the display.
5. If the value is less than 40A, rotate the
function switch to the 40A
AC/DC position to
improve resolution.
Polarity
When measuring from front to back of the
EX623 the meter will display a minus (-) sign before the measurement. If the user requires a
positive (+) sign displayed, the meter must be tested from back to front.
DCA Zero
The Zero feature removes offset values and improves accuracy for DC current
measurements. To perform a zero, select ADC and, with no conductor in the jaw, press and hold
the MODE ZERO button for two beeps. The display will zero. The offset value is now stored and
removed from all measurements.
Frequency
When ACV is selected, the measured frequency can be viewed in the lower display.
AC/DC Voltage Measurements
CAUTION: Do not measure voltages if a motor on the circuit is being switched ON or OFF. Large
voltage surges may occur that can damage the meter.
1. Slide the input shutter to the up position.
2. Rotate the function switch to the V position.
3. Press the MODE button to select AC or DC Voltage.
4. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive V jack.
5. 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.
6. Read the voltage value in the display.
Frequency
When ACA is selected, the measured frequency can be viewed in the
lower display.
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