Last Updated: August 29, 2007
This measurement description is only applicable to GSM calls.
This topic describes the Power versus Time measurement for GSM calls. Power versus Time is a measurement in the Power and Modulation Quality measurement suite.
Power versus Time (PVT) measurements determine if the wireless device's transmitter power falls within specified power and timing ranges. Refer to the Typical GSM PvT Measurement.
During a Power versus Time measurement, the test set makes a narrowband point-by-point measurement of the instantaneous power received during the signal burst.
Power versus Time is a measurement in the Power and Modulation Quality (PMOD) measurement suite. See Power and Modulation Quality Measurement Suite Measurement Parameters for details of the parameters that apply to all measurements in the suite.
The primary result of a Power versus Time measurement is the pass/fail result. The pass/fail result that the test set returns 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 Power versus Time 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.
For statistical analysis, the test set allows you to set up to 12 time offsets. These offsets do not define the mask, but are merely used to get results from specified points on the mask. Note that these points are not the same as those used in the point-by-point comparison which determines the pass/fail result.
The Power versus Time measurement allows you to use the ETSI mask specification or define a custom mask of your own.
On the front panel the measurement results are displayed both graphically and numerically.
SCPI Commands: FETCh:PMODulation:PVTime[:BURSt([1]|2)]:POWer?, FETCh:PMODulation:PVTime:MASK[:ALL]?, FETCh:PMODulation:PVTime[:BURSt([1]|2)]:TRACe?
Power versus Time is a measurement in the Power and Modulation Quality measurement suite. See Power and Modulation Quality Input Signal Requirements for details of the input signal requirements that apply to all measurements in the suite.
