Agilent Technologies N9010A - Manual (Page 61)

Chapter 1 61
Agilent EXA Signal Analyzer
Power Suite Measurements
l. Agilent measures 100
% of the signal analyzers for dynamic range in the factory production process.
This measurement requires a near-ideal signal, which is impractical for field and customer use.
Because field verification is impractical, Agilent only gives a typical result. More than 80
% of proto-
type instruments met this “typical” specification; the factory test line limit is set commensurate with an
on-going 80
% yield to this typical.
The ACPR dynamic range is verified only at 2 GHz, where Agilent has the near-perfect signal avail-
able. The dynamic range is specified for the optimum mixer drive level, which is different in different
instruments and different conditions. The test signal is a 1 DPCH signal.
The ACPR dynamic range is the observed range. This typical specification includes no measurement
uncertainty.
m. ML is Mixer Level, which is defined to be the input signal level minus attenuation.
n. 3GPP requires the use of a root-raised-cosine filter in evaluating the ACLR of a device. The accuracy
of the passband shape of the filter is not specified in standards, nor is any method of evaluating that
accuracy. This footnote discusses the performance of the filter in this instrument. The effect of the RRC
filter and the effect of the RBW used in the measurement interact. The analyzer compensates the shape
of the RRC filter to accommodate the RBW filter. The effectiveness of this compensation is summa-
rized in three ways:
− White noise in Adj Ch: The compensated RRC filter nominally has no errors if the adjacent channel
has a spectrum that is flat across its width.
− TOI−induced spectrum: If the spectrum is due to third−order intermodulation, it has a distinctive
shape. The computed errors of the compensated filter are
−0.001 dB for the 100 kHz RBW used for UE
testing with the IBW method. It is 0.000 dB for the 27 kHz RBW filter used for BTS testing with the
Filtered IBW method. The worst error for RBWs between 27 and 390 kHz is 0.05 dB for a 330 kHz
RBW filter.
− rms CW error: This error is a measure of the error in measuring a CW−like spurious component. It is
evaluated by computing the root of the mean of the square of the power error across all frequencies
within the adjacent channel. The computed rms error of the compensated filter is 0.012 dB for the 100
kHz RBW used for UE testing with the IBW method. It is 0.000 dB for the 27 kHz RBW filter used for
BTS testing. The worst error for RBWs between 27 kHz and 470 kHz is 0.057 dB for a 430 kHz RBW
filter.