Last Updated: August 29, 2007
This measurement description is only applicable to GPRS and EGPRS connections.
This topic describes the Power versus Time measurement for GPRS and EGPRS connections. 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 PVT Mask for a Two Burst Multislot Configuration.
During a Power versus Time measurement, the test set makes a narrowband point-by-point measurement of the transmitted carrier power of the GPRS or EGPRS wireless device as it varies across a single burst or two adjacent modulated TDMA bursts.
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 multislot configuration 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 multislot configuration to determine the points which have failed the most, or the points which are 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 multislot configuration fails the mask. A positive value indicates the multislot configuration is within the mask.
For statistical analysis, the test set allows you to set up to 12 measurement offsets per burst. 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 a subset of 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:MBURsts:TRACe?, 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.
