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62 Chapter 1
Agilent EXA Signal Analyzer
Power Suite Measurements
c. As in footnote b, the specified ACPR accuracy applies if the ACPR measured substantially
exceeds the analyzer dynamic range at the specified offset. When this condition is not met,
there are additional errors due to the addition of analyzer spectral components to UUT spec-
tral components. Unlike the situation in footnote b, though, the spectral components from the
analyzer will be non-coherent with the components from the UUT. Therefore, the errors add
in a power sense. The error is a function of the signal (UUT ACPR) to noise (analyzer ACPR
dynamic range limitation) ratio, SN, in decibels.
The function is error = 10 × log(1 + 10
−SN/10
).
For example, if the UUT ACPR is −75 dB and the measurement floor is −85 dB, the SN ratio
is 10 dB and the error due to adding the analyzer's noise to that of the UUT is 0.41 dB.
Fast ACPR Test [Plot
a
]
a. Observation conditions for ACP speed:
Display Off, signal is Test Model 1 with 64 DPCH, Method set to Fast. Measured with an
IBM compatible PC with a 3 GHz Pentium 4 running Windows XP Professional Version
2002. The communications medium was PCI GPIB IEEE 488.2. The Test Application Lan-
guage was .NET C#. The Application Communication Layer was Agilent T&M Program-
mer’s Toolkit For Visual Studio (Version 1.1), Agilent I/O Libraries (Version
M.01.01.41_beta).
Fast ACP - Standard Deviation vs. Time
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
Nominal Measurement and Transfer Time (log)
Standard Deviation (dB)
5 ms 10 ms 20 ms
40 ms
Sweep Time = 6.2 ms