MA640 Datasheet, PDF (5/12 Pages) Extech Instruments Corporation. – 600Amp AC/DC True RMS Clamp Meter

Operation
NOTES: Read and understand all Warning and Caution statements in this operation
manual prior to using this meter. Set the function select switch to the OFF position when
the meter is not in use.
Non-Contact Voltage Detector
WARNING: Risk of Electrocution. Before use, always test the Voltage Detector on a
known live circuit to verify proper operation.
1. Rotate the Function switch to any measurement
position.
2. Place the detector probe tip on the conductor to be
tested.
3. If AC voltage is present, the NCV detector light will
turn on with a steady red light.
NOTE: The conductors in electrical cord sets are often
twisted. For best results, move the probe tip along
a length of the cord to assure placing the tip in close proximity to the live conductor.
NOTE: The detector is designed with high sensitivity. Static electricity or other sources of
energy may randomly trip the sensor. This is normal operation.
AC/DC Current Measurements
WARNING: Disconnect the test leads before making clamp measurements.
1. Rotate the Function switch to the
600A AC or DC position
2. Press the trigger to open jaw. Fully
enclose only one conductor.
3. Read the current value in the display.
4. If the value is less than 60A, rotate
the function switch to the 60A
position to improve resolution.
DCA Zero
The REL 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 the REL button. The display will zero. The offset value is now stored
and removed from all measurements.
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MA640 V2.1 07/08