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S:\Hp8960\E1960A GSM Mobile Test Application\A.04 Release\Reference_Manual\Chapters\meas_txp_desc.fm
Transmit Power Measurement Description
Transmit Power Measurement Description
How is a transmit power (TXP) measurement made?
The TXP measurement performs a power measurement on a mobile station, averaged over the useful part of
the burst. The signal is captured with a wide band 3 GHz fast RF power detector.
In order to provide the user with a very fast TXP measurement the test set measures the power without
synchronizing it to the midamble. The measurement is made with RF amplitude synchronization; therefore,
the signal does not need to be demodulated to determine the midamble. This technique is different than the
TXP measurement defined in ETSI GSM 11.10. (See
“Burst Synchronization of Measurements” on page 115
).
The power versus time measurement provides a carrier power measurement that is synchronized to the
burst’s midamble, and conforms to the ETSI GSM 11.10 standard. (See the
“Power versus Time Measurement
The output RF spectrum measurement makes the TXP measurement as part of its measurement process, and
makes this measurement result available along with output RF spectrum due to modulation and switching.
The TXP measurement is completely controlled by the digital signal processor (DSP) in the test set. Any power
measurement requires calibration to ensure accuracy. The power meter used for this measurement is zeroed
automatically by the DSP as needed, with no action required by the user. No temperature dependent
calibration is required because temperature compensation in the power detector circuits provide temperature
stability.
Single or Multi-Measurements
The DSP analyzes the data and calculates the results. A single burst for a TXP measurement calculates the
average power over the useful part of the burst. A multiple burst transmit power measurement is made when
the multi-measurement state is on. This measurement calculates average, minimum, maximum, and standard
deviation of the average power measured. All of these results are available to the user with the FETCh
command. The test set always has an integrity indicator available to the user regardless of whether single or
multiple burst measurements are selected.
Types of Signals TX Power can Measure
TXP measurements can be made on these types of input signals.
• Normal GSM TCH burst with mobile station in active cell mode.
• Access (RACH) burst with mobile station in active cell mode.
• Normal GSM TCH burst with mobile station in test mode.
• Access (RACH) burst with mobile station in test mode.
• Bursted signal with GMSK modulation without a valid midamble.
• CW signal.
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