Drummond MTL10 Mk3 Manual de instruções - Página 10

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corresponding marked voltage. For example if the voltage source is

55V AC rms then only the 50V indicator LED band will illuminate, if

700V AC rms all four indicator LED bands will illuminate.

Note: The individual LED indications are not to be used for

measuring purposes.

3.3 Operating Duty Ratio

The voltage indicator should be operated (ON) for a maximum

period of 30 seconds. This should be followed by a recovery period

(OFF) of 4 minutes.

The operating duty ratio is 8 to 1, so if the voltage indicator is only

ON for 2 seconds then the OFF period need only be 16 seconds.

Before each use the voltage indicator should be examined for

damage, cracks, cuts or scratches to the housing, cable and prods.

The cable has black outer and contrasting inner insulation, to allow

damage to the cable to be easily identified. If there is any doubt the

voltage indicator should not be used.

Before and after use, verify the voltage indicator is functioning

correctly with a proving device (PD440S or PD440SRD for MTL10.

PD690S or PD690SRD for MTL15.), or a known good voltage

source. Do not use the voltage indicator if any expected voltage

indication LED's fail to illuminate correctly during proving.