Agilent Technologies N9010A - Manual (Page 22)

22 Chapter 1
Agilent EXA Signal Analyzer
Frequency and Time
c. In the band overlap regions, for example, 3.5 to 3.6 GHz, the analyzer may use either band for mea-
surements, in this example Band 0 or Band 1. The analyzer gives preference to the band with the better
overall specifications (which is the lower numbered band for all frequencies below 26 GHz), but will
choose the other band if doing so is necessary to achieve a sweep having minimum band crossings. For
example, with CF = 3.58 GHz, with a span of 40 MHz or less, the analyzer uses Band 0, because the
stop frequency is 3.6 GHz or less, allowing a span without band crossings in the preferred band. If the
span is between 40 and 160 MHz, the analyzer uses Band 1, because the start frequency is above
3.5 GHz, allowing the sweep to be done without a band crossing in Band 1, though the stop frequency
is above 3.6 GHz, preventing a Band 0 sweep without band crossing. With a span greater than
160 MHz, a band crossing will be required: the analyzer sweeps up to 3.6 GHz in Band 0; then exe-
cutes a band crossing and continues the sweep in Band 1.
Specifications are given separately for each band in the band overlap regions. One of these specifica-
tions is for the preferred band, and one for the alternate band. Continuing with the example from the
previous paragraph (3.58 GHz), the preferred band is band 0 (indicated as frequencies under 3.6 GHz)
and the alternate band is band 1 (3.5 to 8.4 GHz). The specifications for the preferred band are war-
ranted. The specifications for the alternate band are not warranted in the band overlap region, but per-
formance is nominally the same as those warranted specifications in the rest of the band. Again, in this
example, consider a signal at 3.58 GHz. If the sweep has been configured so that the signal at
3.58 GHz is measured in Band 1, the analysis behavior is nominally as stated in the Band 1 specifica-
tion line (3.5 to 8.4 GHz) but is not warranted. If warranted performance is necessary for this signal,
the sweep should be reconfigured so that analysis occurs in Band 0. Another way to express this situa-
tion in this example Band 0/Band 1 crossing is this: The specifications given in the “Specifications”
column which are described as “3.5 to 7.0 GHz” represent nominal performance from 3.5 to 3.6 GHz,
and warranted performance from 3.6 to 7.0 GHz.
Description Specifications Supplemental
Information
Standard Frequency Reference
Accuracy
±[(time since last adjustment ×
aging rate) + temperature stability +
calibration accuracy
a
]
Temperature Stability
20 to 30
°C ±2 × 10
−6
Full temperature range
±2 × 10
−6
Aging Rate
±1 × 10
−6
/year
b
Achievable Initial Calibration Accuracy
±1.4 × 10
−6
Settability
±2 × 10
−8
Residual FM
(Center Frequency = 1 GHz
10 Hz RBW, 10 Hz VBW)
≤10 Hz × N c
p-p in
20 ms (nominal)
a. Calibration accuracy depends on how accurately the frequency standard was adjusted to 10 MHz. If the
adjustment procedure is followed, the calibration accuracy is given by the specification “Achievable
Initial Calibration Accuracy.”
b. For periods of one year or more.
c. N is the LO multiplication factor.