Tektronix NetTek YBT250, User Manual, Page: 187 / 338

Taking Measurements
YBT250 Field Transmitter & Interference Tester User Manual
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4. Tap 100 Half-Slots or 512 Half-Slots to select the number of half
slots over which to average RF power measurements.
5.
Tap
OK
to accept the setting change.
1xEV-DO Transmission Envelopes on the RF Power Screen
The YBT250 draws a waveform representing the averages of either
the idle (not transmitting power in data interval) slots or the non-idle
(transmitting power in data interval) slots. The averaging smooths
out the more extreme bumps in the waveforms. Idle slots and
non-idle slots are averaged separately.
The horizontal axis of the graph is in chips, and the first and last chip
of each data interval is marked.
If the waveform strays outside the green lines of the mask, the mask
test result will display Fail, and the section(s) of the mask where the
failure occurred will turn from green to red. There are mask sections
for each data interval, each mac interval, and for the pilot interval.
You can enable or disable the Mask test by tapping View > Mask. To
set alarm actions (such as beeping), select
Setup > Edit > Limits .
Mask for Idle Slots. Select the Idle button. In the graph area, you will
see a time-domain mask represented by green lines within which you
want to see a square waveform representing the Pilot/MAC signal. If
the waveform strays outside the mask, the Mask Test results will
display Fail.
Mask for Non-Idle Slots. Select the Non-idle button. In the graph area,
you will see a time-domain mask represented by green lines within
which you want to see a long, relatively flat waveform representing
the data-interval part of the signal. If the waveform strays outside the
mask, the Mask Test results will say Fail.
Troubleshooting. The YBT250 attempts to collect 100 or 512 half
slots of the selected slot type (idle or non-idle) before displaying a
result. If the YBT250 cannot collect enough half slots of the selected
type to make the measurement after collecting 1000 total half slots,
the instrument displays the average waveform for as many half slots
as could be collected, and displays the message “* Waveform not
fully averaged *”. If no half slots of the requested type could be