Specifications
2715 Spectrum Analyzer Service Manual 1-3
Table1 -1: CATV Characteristics (Cont.)
Characteristic Description
Frequency Range 15 to 1015 MHz
Resolution 0.1 dB
Absolute Accuracy ±2.5 dB for visual C/N ≥30 dB (300 kHz RBW) and for FM signal C/N ≥33 dB (100
kHz RBW) assumes flatness corrections are present
Relative Accuracy ±0.5 dB relative to adjacent channel
±1.2 dB relative to all other channels
Visual-to-Aural Carrier Level
Difference Measurement
Aural carrier level measured relative to the visual carrier
Difference Range 0 to 30 dB f oraural C/ N≥15 dB (300 kHz RBW)
Resolution 0.1 dB
Accuracy ±0.75 dB for aural C/N ≥15 dB (300 kHz RBW)
Averaged Power(Typical) Averagedamplitude measured with preamp off
Accuracy ±2.5 dB for input levels above --30dBm V,up to +37 dBmV (multi channel) or
+52 dBmV (preselector in use)
Resolution 0.1 dB
Modulation Depth
Measurement (Typical)
Percent AM measured from sync tip to lowest white level found in 10 sweeps (the
VITS line is used if it is defined in the channel table)
AM Range 50%to 95%
Resolution 0.1%
Accuracy ±2% for visual C/N ≥40 dB (300 kHz RBW)
HUM/LFD Measurement (Typical) Power li ne frequency is measured on an unmodulated visual carrier, and low
frequency disturbance (LFD) is measured on the modulated carrier
AM Range 1%to 10% peak-to-peak
Resolution 0.1%
Accuracy ±1% for Hum ≤5% and visual C/N ≥25 dB (300 kHz RBW)
±2% for Hum <10% and visual C/N ≥25 dB (300 kHz RBW)
Carrier-to-Noise (C/N)
Measurement (Typical)
Default noise floor is a normalized 4 MHz bandwidth measured relative to the visual
carrier peak
Optimum Input Range See Figure 1--1on page 1--7
Maximum Range See Figure 1--1on page 1--7
Resolution 0.3 dB
Accuracy See Figure 1--1on page 1--7
In-Service C/N (typical) Noise density is measured at 2 MHz offset (by defaul t) from visual carrier during
quiet lines in the vertical interval, then normalized to 4 MHz BW and expressed as
dBc
Optimum Input Range See Figure 1--1on page 1--7
Maximum Range See Figure 1--1on page 1--7
Resolution 0.3 dB