Agilent Technologies N9010A - Manual (Page 226)

226 Chapter 24
Digital Cable TV Measurement Application
Measurements
c. The sensitivity is specified with 0 dB input attenuation. It represents the noise limitations of the ana-
lyzer. It is tested without an input signal. The sensitivity at this offset is specified in the default 3.9 kHz
RBW, at a center frequency of 474 MHz.
d. The relative accuracy is a measure of the ratio of the power at the offset to the main channel power. It
applies for spectrum emission levels in the offsets that are well above the dynamic range limitation.
e. This dynamic range specification applies for the optimum mixer level, which is about –12 dBm. Mixer
level is defined to be the average input power minus the input attenuation.
Description Specifications Supplemental Information
DVB-C 64QAM EVM
(ML
a
= –20 dBm
20 to 30°C, CF
≤1 GHz)
Modulation Rate = 64 QAM
Symbol Rate = 6.9 MHz
EVM (Smax)
Operating range 0 to 5%
Floor 0.59% Adaptive EQ Off
MER
Operating range
≥22 dB
Floor 41 dB Adaptive EQ Off
Frequency Error
b
Range –150 kHz to 150 kHz
Accuracy ±10 Hz + tfa
c
Quad Error
Range –5
° to +5°
Gain Imbalance
Range –1 to +1 dB
BER Before Reed-Solomon For DVB-C (J.83 Annex A/C) only
Range 0 to 1.0×10
–3
Packet Error Ratio For DVB-C (J.83 Annex A/C) only
Range 0 to 1.0×10
–1
a. ML (mixer level) is RF input power minus attenuation
b. The accuracy specification applies at the EVM =1%.
c. tfa = transmitter frequency
× frequency reference accuracy.