英语翻译There is a problem in the way the unit handles high inpu
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英语翻译
There is a problem in the way the unit handles high input signal levels on any source.
When tested with a CD with a sine wave recorded at a level higher than -10dB,the unit
has excessive THD.To get the THD below 1.0%,I must use a test disc recorded at -10dB.
The same high THD problem is also found on the AUX and USB inputs.It is virtually
impossible to measure output with THD lower than 1.0%,regardless of the input level
(50 to 200mV) or volume control setting.There is audible distortion when using the Aux
inputs at any level.
The CD and USB sources will measure acceptable THD levels,but only if the track levels
are at -10dB or lower.See graphs below.
On Sample Two,the distortion in the amplified output increases at lower frequencies.
This can be caused by incorrect capacitor values,or other circuitry problems.See the
Amplified Outputs – THD vs Freq graph below.
To measure the power available below 1.0% THD,I had to use a special 1kHz track
recorded at -10dB.This was the only way to avoid excessive THD.
There is a problem in the way the unit handles high input signal levels on any source.
When tested with a CD with a sine wave recorded at a level higher than -10dB,the unit
has excessive THD.To get the THD below 1.0%,I must use a test disc recorded at -10dB.
The same high THD problem is also found on the AUX and USB inputs.It is virtually
impossible to measure output with THD lower than 1.0%,regardless of the input level
(50 to 200mV) or volume control setting.There is audible distortion when using the Aux
inputs at any level.
The CD and USB sources will measure acceptable THD levels,but only if the track levels
are at -10dB or lower.See graphs below.
On Sample Two,the distortion in the amplified output increases at lower frequencies.
This can be caused by incorrect capacitor values,or other circuitry problems.See the
Amplified Outputs – THD vs Freq graph below.
To measure the power available below 1.0% THD,I had to use a special 1kHz track
recorded at -10dB.This was the only way to avoid excessive THD.
单元(装置)处理任一来源的高输入信号电平的方式有个问题.
当采用在-10dB以上录制的正弦波测试CD时,单位的总谐波失真过量(过度,过多).
为使总谐波失真低于1.0%,我必须采用-10dB录制的测试盘.
AUX和USB输入存在相同的高总谐波失真问题.无论输入电平(50至200mV)或音量控制设置如何,几乎不可能采用1.0%以下的总谐波失真测量输出.采用Aux输入,任何电平都会有能够听到的失真.
CD和USB源将测量可以接受的总谐波失真电平,但是只有音轨水平为-10dB或更低时才能做到这一点.见下图.
在样本二上,放大的输出失真在更低频率时增加.
这可能是因为电容值不正确,或者其它电路问题.见下图:放大输出 - 总谐波失真与频率.
为了测量总谐波失真1.0%以下的可用功率,我不得不使用-10dB录制的特殊1kHz音轨.这是避免总谐波失真过量的唯一办法.
当采用在-10dB以上录制的正弦波测试CD时,单位的总谐波失真过量(过度,过多).
为使总谐波失真低于1.0%,我必须采用-10dB录制的测试盘.
AUX和USB输入存在相同的高总谐波失真问题.无论输入电平(50至200mV)或音量控制设置如何,几乎不可能采用1.0%以下的总谐波失真测量输出.采用Aux输入,任何电平都会有能够听到的失真.
CD和USB源将测量可以接受的总谐波失真电平,但是只有音轨水平为-10dB或更低时才能做到这一点.见下图.
在样本二上,放大的输出失真在更低频率时增加.
这可能是因为电容值不正确,或者其它电路问题.见下图:放大输出 - 总谐波失真与频率.
为了测量总谐波失真1.0%以下的可用功率,我不得不使用-10dB录制的特殊1kHz音轨.这是避免总谐波失真过量的唯一办法.
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