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## Mean-Subtracted Diode TOD ( microV versus sample number)

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**Mean-Subtracted Diode TOD (microV versus sample number)**q1 u1 q2 u2 No devices attached to input**Mean-Subtracted Diode RMS (microV)**q1 u1 q2 u2**No Devices Connected to Input**filter out f < 5 Hz**Mean-Subtracted Diode TOD After Filtering f < 5 hz (microV**versus sample number)**Mean-Subtracted Diode RMS After Filtering (microV)**10 microvolt RMS**Analog Devices AD8666**Noise Calculation Rated Noise = 8 –60 nV/sqrt(Hz) for 10 < f<10 KHz. Bandwidth of circuit = 20 KHz sqrt(BW) = 141 /sqrt(sec) Expected noise = 1-8 microvolt RMS per preamp 2 preamps implies additional sqrt(2) Expected noise = 1.4 – 12 microvolt Measured noise for f >5Hz =10 microvolt RMS