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NI 6115的噪声指标列在用户手册附录的表A-3中(下面有链接)。您可以利用这些噪声指标用如下公式计算出噪底。
在 +/-10V的量程中,带宽为7.2MHz,系统的噪声是0.35LSB_rms。
1 LSB = 20 V/ 2^12 bits = 0.00488 V
系统噪声 = 0.35 × 0.00488 V = 0.0017 V
噪底 = 0.0017 V / √(7.2 MHz) = 636.9 nV/√Hz
这个值到7.2MHz是一个常量,7.2MHz之后会开始下降。
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