Power Versus Time Measurement Description; How Is A Power Versus Time (Pvt) Measurement Made - Agilent Technologies 8960 10 Series Reference Manual

Power versus Time Measurement Description

July 6, 1999

How is a power versus time (PvT) measurement made?

PvT measurements determine if the mobile station's transmitter power falls within specified power and
timing ranges. Refer to the
During a PvT measurement, the test set makes a narrowband point-by-point measurement of the
instantaneous power received during the GSM burst. A pass or fail result is returned based on a mask
comparison (defined in "ETSI GSM 05.05 Ver 4.21.0 Annex B").
Included with the narrowband point-by-point measurement is a broad-band PvT carrier power measurement,
labeled as Transmit Power on the Summary screen. The PvT Transmit Power measurement is synchronized to
the burst midamble as recommended in ETSI GSM 11.10. (The test set also provides a faster transmit power
measurement that is synchronized to the burst's amplitude. See
on page 106).
The dynamic range of the PvT measurement is approximately a 70 dB.
This measurement conforms to "ETSI GSM 11.10 Ver 4.21.1 Sect 13.3" which is based on "ETSI GSM 05.05
Ver. 4.21.0 Annex B".
Power versus Time Measurement Results
The primary result of a PvT measurement is the pass/fail result. The pass/fail result that the test set returns
to the user indicates whether the entire burst fell within power and timing ranges determined by a
point-by-point comparison of the power versus time measurement mask.
The PvT measurement examines the burst to determine the points where the burst fails by the most or is
closest to failing the upper and lower limits. These worst case points provide the upper and lower limit margin
results. A negative value, along with the offset time, is returned for the result if the burst fails the mask. A
positive value indicates the burst is within the mask. See
For statistical analysis, the test set allows the user to set up to 12 time markers. These markers do not define
the mask, but are merely used to get results from specified points on the mask. See
"SETup:PVTime:TIME[:OFFSet]" on page
point-by-point comparison which determines the pass/fail result.
• Results for a single PvT measurement include:
1. PvT pass/fail result (0 = Pass, 1 & NaN = Fail)
2. PvT measurement integrity indicator
3. Transmit carrier power with midamble synchronization (average power during the burst)
4. Upper limit power margin worst case (how close to or where the signal exceeded upper power limit)
5. Lower limit power margin worst case (how close or where the signal exceeded lower power limit)
6. Upper limit timing margin worst case (the time offset where the signal came close to or exceeded upper
timing limit)
7. Lower limit timing margin worst case (the time offset where the signal came close to or exceeded lower
timing limit)
"Typical GSM PvT Measurement" on page
429. Note that these points are not the same as those used in the
S:\Hp8960\E1960A GSM Mobile Test Application\A.04 Release\Reference_Manual\Chapters\meas_pvt_desc.fm
Power versus Time Measurement Description
91.
"Transmit Power Measurement Description"
"FETCh:PVTime:MASK:ALL?" on page 340.
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