Filter
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Input Noise
Input noise level
Flat top window, −51 dBVrms range, source impedance = 50 Ω, 32 rms averages
Above 1280 Hz
160 Hz to 1.28 kHz (6.4 kHz span)
<–140 dBVrms/√
—
Hz
<–130 dBVrms/√
—
Hz<%0 >
Note: To calculate noise as dB below full scale:
Noise [dBfs] = Noise [dBVrms/
Hz
] + 10LOG(NEBW) – Range [dBVrms].
See ‘’Window Parameters,’’ below, for noise equivalent bandwidths (NEBW).
Window Parameters
Uniform Hann Flat Top
−3 dB bandwidth †
Noise equivalent bandwidth †
Attenuation at ± 1/2 bin
Shape factor (−60 dB BW/−3dBBW)
0.125% of span
0.125% of span
4.0 dB
716
0.185% of span
0.1875% of span
1.5 dB
9.1
0.450% of span
0.4775% of span
0.01 dB
2.6
† For 800 line displays. With 400, 200, or 100 line displays, multiply bandwidths by 2, 4, and 8,
respectively. With 1600 line displays (only available in 1 or 2 channel mode), divide bandwidths by 2.
Single Channel Phase
Phase accuracy relative to external trigger
16 RMS averages, center of bin, dc coupled,
0 dBfs to −50 dBfs, 0 Hz < freq ≤ 10.24 kHz only
±4.0 degree
For Hann and flat top windows, phase is referenced to a cosine wave at the center of the time
record. For the uniform, force, and exponential windows, phase is referenced to a cosine wave
at the beginning of the time record.
Specifications Agilent 35670A
Input Noise
1-6