EX623 Datasheet, PDF (6/15 Pages) Extech Instruments Corporation. – 400Amp True RMS AC/DC Clamp Meter with IR Thermometer

AC/DC Current Measurements
WARNING: Disconnect the test leads before making clamp measurements.
1. Rotate the Function switch to the
400AAC/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 40AAC/DC
position to improve resolution.
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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EX623 V2.2 07/08