XIA UltraLo-1800 User Manual page 42

radio buttons, which switch between taking a trace from the Anode and the Guard. Finally, to collect a
trace simply hit the Acquire Trace button (b
c) Statistics Box
The statistics box shows the mean value and the 2σ variance of the raw ADC trace. These
correspond to the solid yellow line and the two dashed yellow lines, respectively.
d) Fast Fourier Transform Plot
The Fast Fourier Transform (FFT) plot shows the FFT of the raw ADC trace and what frequencies are
present in it. The four largest peaks are identified and highlighted in the plot. When the sampling
interval is appropriate, you will usually see a peak at 60 Hz and several harmonic peaks at 120, 180, etc,
which may have power values greater than 1. There shouldn't be peaks above 1 in power at any other
frequencies. If you see any, or if the peaks at the harmonics of 60 are above 10 in power, consult
Troubleshooting. Zoom and Pan
support@xia.com
).
3
are both enabled on this plot.
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UltraLo-1800 Alpha Particle Counter
Page 42