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 impedence = 50Ω.
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 impedence = 50Ω.
Frequency Alias Responses
Single Tone
(out of displayed range)
, ≤ 0 dBfs, ≤ 1 MHz
(≤ 200 kHz with IEPE transducer power supply On)
2.5% to 97.5% of the Frequency Span <-80 dBfs
Lower and Upper 2.5% of Frequency Span <-65 dBfs
Input Noise
Input Noise Level
Flat Top Window, -51 dBVrms range
Source Impedance = 50Ω
Above 1280 Hz <-140 dBVrms/√
Hz
160 Hz to 1280 Hz <-130 dBVrms/√
Hz
Note: To calculate Noise as dB below Full Scale:
Noise [dBfs] = Noise [dB/√
Hz] + 10LOG(NBW) - Range[dBVrms]; where NBW is the Noise
Equivalent BW of the Window (see below).
Window Parameters Uniform Hann Flat Top
-3 dB Bandwidth* 0.125% of Span 0.185% of Span 0.450% of Span
Noise Equivalent Bandwidth* 0.125% of Span 0.1875% of Span 0.4775% of Span
Attenuation at ±1/2 Bin 4.0 dB 1.5 dB 0.01 dB
Shape Factor 716 9.1 2.6
(-60 dB BW/-3 dB BW)
dB below
Full Scale
Typical Noise Floor vs. Range for Different Frequency Spans
-51 -41 -31 -21 -11 27
0.0028 0.0089 0.028 0.089 0.280 22.4
-100 dB/0.001%
Amplitude Range (dBVrms / Vrms)
-90 dB/0.003%
-80 dB/0.01%
-70 dB/0.03%
51.2 kHz Span
6.4 kHz Span
800 Hz Span
* For 800 line displays. With 1600, 400, 200, or
100 line displays, multiply bandwidths
by 0.5, 2, 4, and 8, respectively.
Single Channel Phase
Phase Accuracy Relative to
±4.0 deg
External Trigger
16 Time Averages
Center of Bin, DC Coupled
0 dBfs to -50 dBfs Only
0 Hz < freq ≤ 10.24 kHz Only
For Hann and Flat Top windows, phase is
relative to a cosine wave at the center of the
time record. For the Uniform, Force, and
Exponential windows, phase is relative to a
cosine wave at the beginning of the time
record.
Cross-Channel Amplitude
FFT Cross-Channel ±0.04 dB (0.46%)
Gain Accuracy
Frequency Response Mode
Same Amplitude Range
At Full Scale: Tested with10 RMS
Averages on the -11 to +27 dBVrms
Ranges, and 100 RMS Averages
on the -51 dBVrms Range
Cross-Channel Phase
Cross-Channel Phase Accuracy ±0.5 deg
(Same conditions as
Cross-Channel Amplitude)
(26 pagine)
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