A-2
Chadwick-Helmuth Company, Inc.
Appendix A -
Specifications
Signal Input Specifications
Spectrum Analysis Specifications
Sensitivity:
19 mV/IPS fixed (velocimeter).
0.5 IPS to 256 IPS full scale
(instrument).
Automatically Selected Grain
Ranges:
4080 gain settings
Input Impedance:
2000 ohms
Coupling:
AC, -0.1 dB at Hz
Minimum Detectable Signal:
60 dB below full scale (typical).
Filtering:
Two fixed corner frequency analog
anti-aliasing filters, 104 dB per
octave initial rolloff.
Variable corner frequency digital
anti-aliasing filters, 685 dB per
octave initial rolloff.
66 dB minimum stop band
attenuation.
Overall flatness:
+
0.1 dB from 1 - 500 Hz;
+0.5 dB from .5 - 10 KHz.
Frequency Ranges:
200 RPM to 600,000 RPM in
arbitrary, user-selected steps.
FFT Frequency Resolution:
461 lines
FFT Time Domain Weighting:
Kaiser window
Frequency Accuracy:
Better than 0.1% without warm-up.
Speed:
1 spectrum per second with 30,000
RPM maximum analysis frequency
selected.
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