Yamaha CP2000, Руководство по обслуживанию

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CP2000
19
2.2.2 Frequency characteristics
Using 1 kHz as a standard for the output voltage, the output voltage shall be within -0.5
±
0.5 dB at 20 kHz when 20 Hz, 1 kHz, 20
kHz, -10 B dBu sine waves are input to the input terminal.
2.2.3 Total harmonic distortion ratio characteristics
The total harmonic distortion ration shall be 1 % or less when a 1 kHz high definition sine wave is input to the input terminal and the
output voltage of 36.4 dBu has been attained. This inspection shall be completed within 30 seconds.
2.2.4 Output noise level
Measure the noise level at both terminals of the load resistance when the input attenuator has been set to MAX and the input
terminal has been grounded by the introduction of a 600
Ω
resistance. It shall be -60 dBu or less. Next, set the input attenuator to
MIN and measure. It shall be -60 dBu or less.
3. Process after completion of inspection
Close up the input attenuator in a half-clockwise direction.
Set YAMAHA SPEAKER PROCESSING to on.
Set the mode switch to STEREO.
4. Others
A DIN audio filter shall be used for the measurement of the noise level.
0 dBu=0.775 V