Supply noise generator

In the logic circuit generates "Pseudo Random Noise", a method of producing the most advanced audio white noise. Set of white noise and pink noise weighting filter, power amplifier and True rms voltmeter, a total of four circuits in one, can take advantage of internal noise source, he needed an external weighting filter. Continuous load test a speaker, speaker boxes, headsets, crossover and other kinds of electro-acoustic components: purpose. b. According to the results of this test to set the rated input power tested products. c. injection speakers produce noise, to determine the speaker's sound pressure sensitivity (dB value). d. use pink noise of this machine with an audio spectrum analyzer can measure the frequency response curve of the speaker. Technical parameters Noise mode: white noise Bandwidth: 20Hz ~ 100 kHz (-3dB point Roll off: -24dB / Oct.) Flatness: ± 1dB pink noise Bandwidth: 20Hz ~ 20 kHz (-3dB point Roll off: -24dB / Oct .) Crest factor: 4 (in accordance with the provisions of IEEE 219) Weighted noise Ⅰ: compliance with IEEE 219, CNS 4785, IEC 268-5, JIS C5531 weighted noise Ⅱ: meet the EIA RS426B weighted noise Ⅲ: comply with DIN 45573 rms voltmeter divided Hi / Lo two tranches Lo: 0 ~ 6 V Hi: (. 1% rdg + 0.5% FS) 0 ~ 30 V Accuracy <± amplifier a.100W continuously adjustable output (maximum output sine wave unclipped shall prevail .) b Frequency Response: 20 Hz ~ 20 kHz ± 0.2dB 20 kHz ~ 100kHz ± 1dB c distortion:.. <0.1% d short-circuit protection, short circuit will not permanently damage the instrument e load impedance:. ≧ 2 Ω