Why do I sometimes I see an increase in baseline noise when I turn on the NSII and the PreAmp is off?
The PreAmp should always be set to at least +10 dB. The PreAmp is not only there to boost weak signals, but also to reduce the noise floor of the overall filter unit. The band-pass filter circuits need gain ahead of them to reduce the overall noise of the circuit. The best settings for low circuit noise use as much PreAmp gain as possible without causing the largest input signals to over-range the amplifier. Turn down the levels on your UT instrument to bring the signal back onto the screen. The PreAmp should never be set to 0 dB unless you have extremely large input signals, at which point the circuit noise will be negligible.
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- Why do I sometimes I see an increase in baseline noise when I turn on the NSII and the PreAmp is off?
