Agilent Technologies N9010A - Manual (Page 229)

Chapter 25 229
DTMB Measurement Application
Measurements
Description Specifications Supplemental Information
Power Statistics CCDF
Minimum power at RF Input –50 dBm (nominal)
Histogram Resolution 0.01 dB
a
a. The Complementary Cumulative Distribution Function (CCDF) is a reformatting of a histogram of the
power envelope. The width of the amplitude bins used by the histogram is the histogram resolution.
The resolution of the CCDF will be the same as the width of those bins.
Description Specifications Supplemental Information
Adjacent Channel Power
Minimum power at RF Input –36 dBm (nominal)
ACPR Accuracy
a
±0.93 dB RRC weighted,
7.56 MHz noise bandwidth
method = IBW,
Offset Freq = 8 MHz,
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.