SC5 Signal Conversion Performance Measurements
57
Figure 37: SC5 output noise 10 Hz - 300 kHz.
Typical RMS and peak-to-peak noise values in the 10 Hz to 300 kHz range are listed below:
RMS noise p-p noise
< 10 µV < 85 µV
Table 12: Typical maximum output noise level in the 10 Hz to 300 kHz range.
Noise using external filters
The output noise can be further reduced by using external low-pass filters. The output noise above 0.1 Hz for
different cut-off frequencies is listed in the table below, for first and second order active filters (built-in filters of the
SR560 preamplifier). The sampling frequency of the measurement is set to twice the filter cut-off frequency.
Cut-off frequency 6 dB/Oct. 12 dB/Oct.
RMS noise p-p noise RMS noise p-p noise
100 kHz < 7.8 µV < 79 µV < 7 µV < 68 µV
10 kHz < 1.9 µV < 17.5 µV < 1.65 µV < 15 µV
1 kHz < 640 nV < 5 µV < 580 nV < 4.4 µV
100 Hz < 320 nV < 1.9 µV < 320 nV < 1.8 µV
Table 13: Output noise above 0.1 Hz when using external 1st or 2nd order low-pass filters with the indicated cut-off
frequencies.
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