Tektronix MTS415, Technical Reference

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Specifications
Version 00b
MTS400 Series Performance Verification and Specifications Technical Reference
1−15
Table 1−11: QAM Annex B board characteristics (Cont.)
Characteristic Description
Input return loss 5 dB minimum
Ultimate Modulation Error Ratio with
equalizer
w
37 dB with an equalizer
Table 1 − 12 lists electrical characteristics for the QAM Annex B measurements.
Table 1−12: QAM Annex B measurements
Characteristic Description
RF lock RF lock is indicated by LED and Status
Input level (signal strength) Range: −64 dBm to −19 dBm (45 dBuV to 90 dBuV
relative to 75
)
Resolution: 1 dB
Accuracy:
"
3 dB
EVM (Error Vector Magnitude) Display Range for 64 QAM:
v
1% to
w
5% rms
Display Range for 256 QAM:
v
1% to
w
2.5% rms
Resolution: 0.1%
Accuracy:
"
1%
MER (Modulation Error Ratio) with
Equalizer Display Range:
64 QAM: 22 dB to 37 dB
256 QAM: 28 dB to 37 dB
Resolution: 0.1 dB
Accuracy:
"
1 dB for MER < 25 dB;
"
3 db for MER
25 dB to 34 dB (measured at −30 dBm input)
SNR (Signal to Noise Ratio) Display Range:
64QAM: 22 dB to 37 dB
256QAM: 28 dB to 37 dB
Resolution: 1 dB
Accuracy:
"
1 dB for SNR < 25 dB;
"
3 db for SNR
25 dB to 34 dB
BER (Bit Error Ratio) Pre-RS BER is displayed
TEF (Transport Error Flag) Transport Error Flags (uncorrectable error count) in a
1 second window and 10 second window are
displayed
Constellation The RF constellation is displayed
QAM Annex B
Measurements