Auxiliary Equipment

Abstract

The Firth Cleveland frequency meter Type FM1015, manufactured by Firth Cleveland Instruments Ltd., Treforest, Pontypridd, Glamorgan, Wales, a member of the Firth Cleveland Group, is a lightweight instrument, designed to measure the frequency of signals having a wide variation in both amplitude and wave‐form over four switched frequency ranges for full‐scale indication of 200 c/s, 2 Kc/s, 20 Kc/s and 200 Kc/s. The instrument may be operated from an internal battery or mains supply, and over each of the frequency ranges stated, the accuracy of indication is within ±2½ per cent of F.S.D. when the input signals have an amplitude within 0·075 and 10 volts r.m.s.

Citation

(1961), "Auxiliary Equipment", Aircraft Engineering and Aerospace Technology, Vol. 33 No. 1, pp. 31-31. https://doi.org/10.1108/eb033367