Nippen electrical instruments co. Offers vibrating reed type frequency meters. This is an iso 9001-2000 certified company. Vibrating reed frequency meter consists of steel reeds. This steel is in the field of an electromagnet and vibrates in resonance with the energizing a.C. Of this electromagnet. These are manufactured having 11, 13 or 21 reeds. Only the individual reed, natural frequency of which corresponds with the frequency of the a.C. Supply will vibrate at full amplitude indicating the correct frequency on the dial.
