specificatio for piezo traducer 1.scope this specification is applied to piezo traducer. the products described below are used for sounder in various alarm systems. 2.basic condition 2.1 operating voltage: 1.0—25.0vp-p 2.2 operating temperature range: -20—+80 ℃ 2.3 storage temperature range:-30—+85 ℃ 3.electrical characteristics 3.1 specification 3.1.1 output spl: ≥ 80 db at 10cm , 4000hz, 5 .0vp-p 3.1.2 coumption current: ≤ 2 .0ma : at 5.0 vp-p 3.1.3 resonant frequency: 4000 ± 500hz 3.1.4 capacitance: 1 5 000 ± 30%pf at 120hz 3.2 measuring method 3.2.1 measuring circuit for spl, coumption current, resonant frequency input signal: 5 .0vp-p, 4000hz, s.g: signal generator ma: milliammeter amp: amplifier mic: measuring condeer microphone dsp: display screen 3.2.2 capacitance measuring: lcr meter 3.2.3 measuring condition temperature: 15 — 35 ℃ r.h. 45 — 75% 3.2.4 judgement condition temperature : 25 ± 2 ℃ r.h. 45 — 75% 本产品的加工定制是是，品牌是ringford，型号是smpt12s400，种类是蜂鸣器(片)，驱动方式是压电式(晶体式)，是否有源是无源，规格尺寸是12*12*3（mm）