Final Inspection

Ferroperm has a quality assurance system for monitoring manufacturing processes and equipment in order to maintain quality and reliability levels. Ferroperm performs quality control on all batches from the production. The employees in the Quality Assurance Division take samples based on Military Standard MIL-STD-1050 (ISO 2602-1973). The accepted quality limit AQL is 0.65 - Sample plan 2.

Example of final inspection Quantity of the batch  Samples   Accepted   Rejected 0 - 280 281 - 1.200 1.201 - 3.200 3.201 - 10.000 20 80 125 200 0 1 2 3 1 2 3 4

Ferroperm controls a wide range of mechanical-, dimensional-, electrical- and piezo-electrical parameters. Other parameters can be controlled on request. Click to see the Final Inspection Sheet with all the parameters which are controlled. We also control whether our standard tolerances are kept. Tighter customer-defined tolerances are controlled on request.  Standard Tolerances Electrical properties Electromechanical properties Mechanical properties +/-10% +/- 5% +/- 2.5%  Standard Tolerances on Dimensions Diameter of rings or discs: +/- 0.3 mm up to 10 mm diameter and +/- 3% above 10 mm diameter Length and width of plates: +/- 0.3 mm Thickness of rings, discs or plates: +/- 3%  Standard Tolerances for focusing bowls Radius (R1, R2) +/- 3% or 3 mm whichever is largest Diameter +/- 3% or 0.3 mm whichever is largest Thickness uniformity, max. variation of 2.5% or 0.025 mm whichever is largest  Standard Tolerances on Frequency +/- 5% to 4 MHz +/- 10% above 4 MHz

Ferroperm Piezoceramics A/S Hejreskovvej 18A DK-3490 Kvistgård Tel.: +45 49 12 71 00; Fax: +45 49 13 81 88 e-mail: pz@ferroperm-piezo.com