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CLIOwin 7 PCI User's Manual - Audiomatica

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DIN<br />

measures Intermodulation distortion using DIN standard. Two tones are generated<br />

in a 4:1 ratio at 250Hz and 8000Hz. Intermodulation components up to the 5 th order<br />

are considered for distortion.<br />

CCIF<br />

measures Intermodulation distortion using two equal level near spaced (1kHz) in<br />

Frequency tones. Difference Intermodulation components up to the 2 th order are<br />

considered for distortion. To keep results directly comparable with THD analysis both<br />

output Voltage or Power are single tone equivalent scaled. Considering a power<br />

amplifier clipping point, this usually due to the peak value of the signal rather then<br />

it RMS value. With two tone of equal level the RMS values is 3dB lower than the same<br />

peak to peak single tone.<br />

Freq<br />

Has no effect in SMPTE and DIN analyses which use fixed frequencies. Set the<br />

measurement frequency for Linearity and THD. Set the center Frequency for CCIF;<br />

for example 15500Hz means two tone are generated, spaced by 1kHz, at 15000Hz<br />

and 16000Hz<br />

176 Chapter 14 - Linearity & Distortion

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