Digital Signal Processing Reference
In-Depth Information
±2.92% (0.25 dB) of reading
±0.025% of full scale
•
FFT full scale accuracy at 1 kHz (0 dBfs)
±0.15 dB (1.74%)
•
FFT full scale flatness (0 dBfs), relative to 1 kHz
±0.2 dB (2.33%)
•
FFT amplitude linearity at 1 kHz
Measured on +27 dBVrms range with time averaging
0 to -80 dBfs ±0.58% (0.05 dB) of reading ±0.025% of full scale
•
Amplitude resolution
16 bits less 2 dB over-range with averaging 0.0019% of full scale
(typical)
•
Residual DC response (FFT mode)
Frequency display (excludes A-weight filter)
<-30 dBfs or 0.5 mVdc
C.2.3
FFT Dynamic Range
•
Spurious free dynamic range
90 dB typical (<-80 dBfs)
(Includes spurs, harmonic distortion, intermodulation distortion,
alias products)
Excludes alias responses at extremes of span
Source impedance = 50
800 line display
•
Full span FFT noise floor (typical)
Flat top window, 64 RMS averages, 800 line display
•
Harmonic distortion
<-80 dBfs
Single tone (in band), 0 dBfs
•
Intermodulation distortion
<-80 dBfs
Two tones (in-band), each -6.02 dBfs
•
Spurious and residual responses
<-80 dBfs
Source impedance = 50
•
Frequency alias responses
Single tone (out of displayed range), 0 dBfs, 1 MHz
(200 kHz with IEPE transducer power supply on)
