Stereo System User Manual

254 Chapter 24
VXA Measurement Application
Vector Modulation Analysis (89601X Option AYA)
Vector Modulation Analysis (89601X Option AYA)
Description Specifications Supplemental Information
Accuracy Formats other than FSK, 8/16VSB, 16/32 APSK,
and OQPSK; Conditions: Full scale signal, fully
contained in the measurement span, frequency <
3.6 GHz, random data sequence, range ≥ –30
dBm, start frequency ≥ 15% of span, alpha/BT ≥
0.3 (0.3 to 0.7 for OQPSK), and symbol rate ≥
1 kHz. For symbol rates < 1 kHz, accuracy may be
limited by phase noise. Averaging = 10
Residual Errors Result = 150 symbols
averages = 10
Residual EVM
Span
≤100 kHz
a
≤1 MHz
≤10 MHz
EVM
<0.50% rms
<0.50% rms
<1.00% rms
Magnitude Error
Span
≤100 kHz
≤1 MHz
≤10 MHz
Error
<0.30% rms
<0.50% rms
<1.00% rms
Phase Error
Span
≤100 kHz
a
≤1 MHz
≤10 MHz
Error
0.3° rms
0.4° rms
0.6° rms
Frequency Error Symbol rate/500,000 Added to frequency accuracy if applicable
IQ Origin Offset −60 dB or better
Video Modulation Formats
Residual EVM
8/16 VSB
≤1.5% (SNR ≥36 dB) Symbol rate = 10.762 MHz,
α= 0.115, frequency < 3.6 GHz,
7 MHz span, full-scale signal,
range ≥−30 dBm,
result length = 800, averages = 10