Tektronix NetTek YBT250, Руководство пользователя

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Appendix A: Specifications
YBT250 Field Transmitter & Interference Tester User Manual
A- 7
Table A- 2: Measurement characteristics (Cont.)
Measurement Description
Resolution 1 PN Index
Each PN Index is 64 chips
Accuracy Displayed PN Index must match PN Offset of CDMA
signal.
Pilot Time Alignment Error (Tau) Measures the time offset between the PN sequence of
the input signal and the External Even Second Clock (on
Timing Input connector).
Units Microsecond (
μ
s)
Chips
Resolution 0.1
μ
s
1 chip
Accuracy
±
250 ns typical
Waveform Quality (Rho,
ρ
) Measures waveform quality as defined by IS-97-D using
a “pilot-only” CDMA (or cdma2000--1x) signal.
Units None
Resolution 0.0001
Accuracy
±
0.005, 0.9
≤ ρ ≤
1.0
Usable range 0.5
≤ ρ ≤
1.0
Degradation due to adjacent channel CDMA carriers
(having equivalent power): add
±
0.015.
Reference Information:
The Rho measurement is only specified for a ”pilot--only”
CDMA signal. The accuracy specification given here
applies only to measurements made on a ”pilot--only”
CDMA signal, and with the instrument set to use the pilot
only method. For measurements on signals that are not
”pilot--only”, see the Estimated Waveform Quality
measurement.