Specifications
1-4 2715 Spectrum Analyzer Service Manual
Table1 -1: CATV Characteristics (Cont.)
Characteristic Description
Accuracy See Figure 1--1on page 1--7
Desired-to-Undesired Ratio (Typical) Channel averaged power is divided by total noise plus di stortion in the channel
Resolution 0.1 dB
Accuracy ±2 dB withinthe limits shown in Figure 1--6on page 1--9
CTB Measurement (Typical) Com posite triple beat (CTB) is measured relative to the visual carrier peak according
to the NCTArecomm ended spectrum analyzer settings —SINGLE-SWEEP mode
does not use all the NCTA recommended settings
Maximum Range See Figure 1--2on page 1--7
Resolution 0.3 dB
Accuracy See Figure 1--2on page 1--7
Digital Channel CTB (Typical) Measuredrelative to the averaged power of the test channel
Resolution 0.3 dB
Accuracy ±2 dB withinthe limits shown in Figure 1 --8 on page 1--10
CSO Measurement
(Typical)
Composite second order (CSO) is measured relative to the visual carrier peak
according to the NCTArecomm ended spectrum analyzer settings —SINGLE-
SWEEP and CONTINUOUS modes do not use all the NCTA recommended settings
Optimum Input Range See Figure 1--3on page 1--8
Maximum Range See Figure 1--3on page 1--8
Resolution 0.3 dB
Accuracy See Figure 1--3on page 1--8
In-Service CSO (Typical) CSO products are measured per NCTArecommendations during quiet lines in the
vertical interval, then expressed as dBc
Optimum Input Range See Figure 1--4on page 1--8
Maximum Range See Figure 1--4on page 1--8
Resolution 0.3 dB
Accuracy See Figure 1--4on page 1--8
Digital Channel CSO (Typical) Measured relative to the averaged power of the test channel
Resolution 0.3 dB
Accuracy ±2.0 dBwithin the limits shown in Figure 1--7on page 1--10
Frequency Response
Measurement (Typical)
For fixed-amplitude scrambling or no scrambling, system amplitude variations
(flatness) are measured relative to a reference trace (stored during the frequency
response reference setup)
Reference Trace Storage
(Nonvolatile)
Up to 10 traces with spectrum analyzer states
Range 5 dB/ div,fixed
Resolution 0.2 dB
Trace Flatness Accuracy ±0.75 dB