Tektronix NetTek YBT250, User Manual

Page: 200 / 338

Taking Measurements
3- 98
YBT250 Field Transmitter & Interference Tester User Manual
OTA Signal Quality Icon
When over the air (OTA) measurements are enabled, the OTA Signal
Quality icon provides a way to easily monitor the quality of the
received signal to optimize cdma2000 or 1xEV-DO OTA measure-
ment accuracy.
The most accurate OTA measurements are made when the Pilot
Dominance (PD) value is high and Multipath Power (MP) value is
low (indicated by green indicators on the icon) for the selected
channel. The signal quality indicator thresholds (red/yellow/green)
are set on the Meter tab (
Edit > Meter ), and can be configured to
your location needs.
The OTA Signal Quality icon is shown only if option CS1
(cdma2000) or ES1 (1xEV-DO) is installed. The icon displays valid
results when the YBGPS1 GPS Timing Reference is connected and
satellite signals are locked, a cdm2000 or 1xEV-DO signal standard
is selected, OTA measurements are enabled on the Meter tab, and an
applicable measurement is selected (Pilot Power, Code Power,
Codogram, or Signal Quality).
Measuring W-CDMA Signal Quality
Requires Option WD1 or WD2
For W-CDMA signal quality, the measurements performed are:
Option WD1: Error Vector Magnitude (EVM), Carrier Feedthrough
(CFt), and Scrambling Code.
Option WD2: The WD1 measurements plus EVM16QAM and PCDE
(Peak Code Domain Error).
To measure signal quality:
1.
Tap the
Measurement
button.
2. Tap Select Measurement... .
3. Tap Signal Quality . See Figure 3--48.
4. Select the appropriate W-CDMA signal standard.