37 | Keysight | FieldFox Handheld Analyzers 4/6.5/9/14/18/26.5/32/44/50 GHz - Data Sheet
Extended Range Transmission Analysis (ERTA) (continued)
Dynamic range and maximum attenuation
Dynamic range is the difference between the maximum output power available from FieldFox’s source and the noise floor of the sec-
ond FieldFox, while ensuring that neither FieldFox’s ADC goes into over-range. Dynamic range also accounts for the loss of the power
splitter. Dynamic range is applicable when testing devices such as filters, where there is low loss in the passband, and significant loss
in the stopband, and both passband and stopband need to be on the display at the same time (same sweep).
Maximum attenuation is the difference between maximum output power available from FieldFox’s source and the noise floor of
FieldFox. It also accounts for the loss of power splitter. Maximum attenuation is applicable when testing devices such as cables, which
have relatively uniform loss over the swept frequency range.
The values shown are based on the recommended minimum RBW of 3 kHz when the frequency references are locked via GPS, and 300
kHz when the frequency references are unlocked. Locking the frequency references to GPS allows for greater frequency accuracy of
the FieldFoxes and use of a narrower RBW, which in turn results in a lower DANL, and hence a wider measurement range. When the
GPS signals cannot be present at all times, the GPS hold-over mode can be used.
Dynamic range (dB)
N991xA, N993xA
Typical
Preamp off
Preamp on
Preamp off
Preamp on
Frequency references
locked to GPS, RBW 3 kHz
Frequency references
locked to GPS, RBW 3 kHz
Frequency references
unlocked, RBW 300 kHz
Frequency references
unlocked, RBW 300 kHz
> 2 MHz1 to 6 GHz
> 6 to 13 GHz
> 13 to 22 GHz
> 22 to 25 GHz
> 25 to 26.5 GHz
88
86
70
63
58
83
83
86
83
77
68
66
50
43
38
63
63
66
63
57
Maximum attenuation (dB)
Typical
N991xA, N993xA
Preamp off
Preamp on
Preamp off
Preamp on
Frequency references
locked to GPS, RBW 3 kHz
Frequency references
locked to GPS, RBW 3 kHz
Frequency references
unlocked, RBW 300 kHz
Frequency references
unlocked, RBW 300 kHz
> 2 MHz to 6 GHz
> 6 to 13 GHz
> 13 to 22 GHz
> 22 to 25 GHz
> 25 to 26.5 GHz
93
86
70
63
58
108
103
91
83
77
73
66
50
43
38
88
83
71
63
57
1. Dynamic range is decreased from 3 to 9 dB at 2 MHz.
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