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Chapter 22 235
DTMB Measurement Application
N6156A, DTMB Measurement Application
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;
0 to 55 °C
–36 dBm (nominal)
ACPR Accuracy
a
Offset Freq
8 MHz
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.
±0.93 dB
RRC weighted, 7.56
MHz noise
bandwidth, method = IBW
At ACPR –45 dBc with optimum
mixer level
b
b. ACPR accuracy for this case is warranted when the input attenuator is set to give an average mixer
level of –18 dBm.