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SAFETY
SAFETY WARNINGS
• The Device Under Test (DUT) must be fully deenergized before AT7™ series instruments can be
connected for any test.
• Please do not touch test leads during any on-going tests.
Introduction
Safety Warnings and Precautions must be understood and observed when the instrument is
being used. Follow all safety rules of your company and OSHA (or country equivalent) for
deenergized (off-line) testing methods, including wearing appropriate Personal Protective
Equipment (PPE). To ensure proper and safe operation of the AT7 series instruments is the sole
responsibility of the user.
The AT7 series instruments are only to be used on deenergized motors. Connecting the
instrument to live voltage will destroy the unit and void the warranty. Always verify the motor
circuit is deenergized before connecting the instruments. Ensure that all power has been
removed from the circuit being tested, including static power stored in capacitors. Discharge all
capacitors involved in the motor circuity. During testing, ensure that one terminal of any power
factor correction capacitor or lightning arrestor that is in the test circuit is disconnected to avoid
erroneous test results.
During MCA testing, the instrument sends out a low voltage, low frequency test signal not
harmful to the human being or most electronic equipment (variable frequency drives and soft
starters). However, electronic equipment and personnel must observe appropriate safety
considerations (disconnect electronic equipment) when performing the insulation to ground
resistance test (Meg-Ohm test).
Test leads including crocodile clips must be in good shape, clean and have no broken or cracked
insulation.
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