Wavecom Instruments Insulation-Continuity Tester User Manual
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Use with caution in the presence of voltage above 24V as
these pose a shock hazard.
1.7 Pay attention to cautions and warnings which will inform
you of potentially dangerous procedures.
1.8 Your analogue insulation tester has a live circuit warning
beeper. If it is connected to an AC live circuit, a beep of twice the
frequency of the voltage present will be heard.
DO NOT proceed to test and immediately disconnect the
instrument from the circuit. In addition, the warning light will
illuminate if the voltage is above 100Vdc or 70Vac.
When AC voltage is present, before testing, it's value is
displayed on the AC scale.