Taiwan Sunshine 7117C high speed F0 tester I. Overview fast automatic test speaker FO value ◇ FO (resonance frequency) in four sections, the option to test, high precision ◇ simple upper and lower limit value is set ◇ digital display, the display is divided into ordinary and test display, intuitive and accurate determination function ◇ LED display, fast, accurate Second, the product uses: for QA QC testing and production line testing, rapid determination FO value of the product is qualified. Third, the technical parameters of a frequency range:? 16 Hz ~ 3 kHz, 4 files:?????.? A 16 Hz ~ 80 Hz b 54 Hz ~ 270 Hz????..?????. .?? c 180 Hz ~ 900 Hz d 600 Hz ~ 3 kHz 2, measurement error:???..?????.? ± 1% or ± 1 Hz 3, the lower limit?????? error: less than 1% of the measured voltage:? Vrms ± 10% (According to EIA Std?????) 5, impedance range:?.? Ω ~ 100Ω ,? divided into two files:? a:? 3-18 b : 19-100