7.3.2.1.1 For motor-operated tools with two rotating directions, measurements shall be made for each direction after operating periods of 15 min for each direction, the highest of the two disturbance levels shall comply with the limit.
7.3.2.1.2 Electric power-operated tools which incorporate vibrating or swinging masses shall be tested with these masses disengaged by a clutch or other mechanical device or electrically disconnected by a switch, if possible. If such disengagement or disconnection is not possible and if according to the manufacturer's instruction the tool shall not be used at no-load, then the vibrating or swinging masses shall be removed and the mains voltage lowered so that the tool operates at its nominal speed.
7.3.2.1.3 For tools designed to operate via a transformer intended to be connected to the mains supply, the following measuring procedure shall be applied:
a) Terminal voltage: 148,5 kHz to 30 MHz 端子电压:148.5 kHz -30 MHz
If the tool is sold together with a step-up transformer the disturbance shall be assessed by measurements made on the power supply side of the transformer. The power supply lead from the tool to the transformer shall have a length of 0,4 m or, if longer, folded to form a horizontal bundle with a length between 0,3 m and 0,4 m.
If the tool is intended to be used with a transformer, the disturbance shall be assessed by measurements made on the power supply side of the transformer recommended by the manufacturer for use with the tool.
如果工具打算与变压器一起使用,则通过在制造商推荐与工具一起使用的变压器的电源端进行测量来评定骚扰。
Where a tool is not supplied with a "sample" transformer at the time of the test, it shall be operated at its rated voltage, and the disturbance shall be assessed by measurements made at the tool's power input connections.
b) Disturbance power: 30 MHz to 300 MHz 骚扰功率:30 MHz - 300 MHz
The disturbance shall be assessed by measurements made on the tool's power input connection whilst being supplied at its rated voltage. The tool shall, during measurement, be equipped with a power supply lead with a length suitable for measurements with the absorbing clamp as described in 6.2.4.
a) For equipment with neither a thermostatically or electronically controlled switch, nor a motor, nor a regulating control (i.e. equipment which does not generate disturbances) measurements need not be performed;
b) Equipment with thermostatically or electronically controlled switch shall be operated with the highest possible duty-cycle. If there is a control device for the temperature the click rate N shall be determined for a duty cycle of (50 ± 10) % of this control device;