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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