Agilent Technologies N9010A - Manual (Page 225)

Chapter 24 225
Digital Cable TV Measurement Application
Measurements
Description Specifications Supplemental Information
Adjacent Channel Power
Minimum power at RF Input –36 dBm (nominal)
ACPR Accuracy
a
8.0 MHz noise bandwidth
method = IBW
Offset Freq
8 MHz ±0.98 dB At ACPR –45 dBc with
optimum mixer level
b
a. The accuracy of the Adjacent Channel Power Ratio will depend on the mixer drive level and whether
the distortion products from the analyzer are coherent with those in the UUT. These specifications
apply even in the worst case condition of coherent analyzer and UUT distortion products. For ACPR
levels other than those in this specifications table, the optimum mixer drive level for accuracy is
approximately –37 dBm – (ACPR/3), where the ACPR is given in (negative) decibels.
b. To meet this specified accuracy when measuring transmitter at –45 dBc ACPR, the mixer level (ML)
must be optimized for accuracy. This optimum mixer level is –19 dBm, so the input attenuation must
be set as close as possible to the average input power. For example, if the average input power is
–3 dBm, set the attenuation to 16 dB. Note that if the mixer level is set to optimize dynamic range
instead of accuracy, accuracy errors are nominally doubled.
Description Specifications Supplemental Information
Spectrum Emission Mask
(6.9 MHz Integration BW,
RBW = 3.9 kHz)
4.2 MHz offset
Dynamic Range, relative
ab
86.9 dB 94.0 dB (typical)
Sensitivity, absolute
c
–105.5 dBm –111.5 dBm (typical)
Accuracy
Relative
d
±0.18 dB
Absolute
(20 to 30°C)
±1.05 dB ±0.31 dB (95th percentile)
10 MHz offset
Dynamic Range, relative
e
90.8 dB 97.1 dB (typical)
Sensitivity, absolute –105.5 dBm –111.5 dBm (typical)
Accuracy
Relative ±0.22 dB
Absolute
(20 to 30°C)
±1.05 dB ±0.31 dB (95th percentile)
a. The dynamic range specification is the ratio of the channel power to the power in the offset specified.
The dynamic range depends on the measurement settings, such as peak power or integrated power.
Dynamic range specifications are based on default measurement settings, with detector set to average,
and depend on the mixer level. Default measurement settings include 3.9 kHz RBW.
b. This dynamic range specification applies for the optimum mixer level, which is about –16 dBm. Mixer
level is defined to be the average input power minus the input attenuation.