Tektronix NetTek YBT250, Руководство пользователя

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Taking Measurements
YBT250 Field Transmitter & Interference Tester User Manual
3- 103
Table 3- 18: 1xEV-DO Signal Quality measurement fields (Cont.)
Field Description
Timing Error The difference between an ideal signal with PN timing
exactly aligned to a PN Offset location, and the
received signal as observed at the module RF input
port. The difference is the residual timing error of the
received signal from the nearest legal PN Offset. The
error is expressed in both microseconds and
equivalent number of chips.
PN Offset The time difference, measured in 64 PN-chip intervals,
between the Even Second Clock pulse and the first
chip of the next complete short-code PN spreading
sequence in the signal, as observed at the module RF
input port. PN Offset values are integer numbers with
a range of 0 to 511.
Measuring GSM/EDGE Signal Quality
Requires Option EM1
For GSM/EDGE signal quality, the measurements performed are:
Phase Error, Error Vector Magnitude, Origin Offset, and Carrier to
Interference ratio (C/I).
To measure signal quality:
1.
Select the appropriate GSM standard.
2.
Tap the
Measurement
button.
3.
Tap
Select Measurement...
.
4.
Tap
Signal Quality
. See Figure 3--50.
5.
Tap the
Forward Link
button.
6.
Select a channel.