FIELD: measuring engineering.
SUBSTANCE: high voltage is applied between the part to be worked, which is the anode, and the cathode. The alternative component of current is taken off at the measuring resistance and supplied to the band filter with boundary frequencies 500-700 and 1300-1500 Hz. The effective voltage is measured at the output of the band filter. The initial voltage is calculated by averaging the value of the effective voltage over 20-40 s from the beginning of the process. The roughness is determined from the formula proposed.
EFFECT: enhanced efficiency of measurements.
1 dwg, 1 tbl
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