Full span FFT noise floor
(typical)
Flat top window, 64 RMS averages, 800 line display.
Typical noise floor vs. range for different frequency spans
-70 dB/0.03%
dB below
full scale
-80 dB/0.01%
51.2 kHz Span
-90 dB/0.003%
-100 dB/0.001%
6.4 kHz Span
800 Hz Span
-51
0.0028
-41
0.0089
-31
0.028
-21
0.089
-11
0.280
27
22.4
Amplitude range (dBVrms / Vrms)
Harmonic distortion
Single Tone (in band), ≤ 0 dBfs
Intermodulation distortion
Two tones (in-band), each ≤ -6.02 dBfs
Spurious and residual responses
Source impedence = 50 Ω.
Frequency alias responses
<-80 dBfs
<-80 dBfs
<-80 dBfs
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
Lower and upper 2.5% of frequency span
<-80 dBfs
<-65 dBfs
Input noise
Input noise level
Flat top window, -51 dBVrms range
Source impedance = 50 Ω
Above 1280 Hz
<-140 dBVrms/√
2
Hz
160 Hz to 1280 Hz
<-130 dBVrms/√
2
Hz
Note: To calculate noise as dB below full scale:
Noise [dBfs] = Noise [dB/√
2
Hz] + 10LOG(NBW) - Range
[dBVrms]; where NBW is the noise equivalent BW of the
window (see below).
Window parameters
-3 dB bandwidth*
Noise equivalent bandwidth*
Attenuation at ±�½ bin
Shape factor
(-60 dB BW/-3 dB BW)
Uniform
0.125% of span
0.125% of span
4.0 dB
716
Hann
0.185% of span
0.1875% of span
1.5 dB
9.1
Flat top
0.450% of span
0.4775% of span
0.01 dB
2.6
* For 800 line displays. With 1600, 400, 200, or 100 line displays, multiply bandwidths by 0.5, 2, 4, and 8, respectively.
5
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