TX Dynamic Power Measurement Troubleshooting
Last updated: January 16, 2009
Possible Setup Issues
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The TX dynamic power measurement is not performed with a call established between the test set and UE. Rather, you must place your UE into a test mode which forces it to transmit a power sequence of successive down steps of fixed size and duration.
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Before starting the TX dynamic power measurement, you must use
Manual Receiver Control
to specify the initial transmit power of the UE's power sequence (the expected power of step 0) to properly range the test set's receiver. You must also specify the UE's transmit frequency (see
Measurement Frequency
).
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You must set
Power Step Size
,
Power Step Time
and
Number of Power Steps
to match the power sequence to be transmitted by the UE.
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During front panel operation of this measurement, you must press the
START SINGLE
key to initiate the measurement.
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Once the measurement has been initiated, the UE must trigger the measurement with a positive change in power from 20 dB below the initial transmit power up to the initial transmit power. To ensure successful triggering, it is recommended that you first order the UE to transmit continuously at the initial transmit power level, initiate the measurement, then order the UE to drop and then raise its output power by more than 20 dB to create the RF rise trigger.
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Ensure that you have met the
TX Dynamic Power Input Signal Requirements
.
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Before performing a TX dynamic power measurement, ensure that the measurement has been properly calibrated (see
Calibrating the Test Set
).
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Ensure that you have entered the proper
Amplitude Offset
values for your test setup.
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Ensure that you set the
Measurement Timeout
to a value great enough to allow you to command the UE to transmit its power sequence and for the test set to measure the power sequence.
Other Considerations
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The TX dynamic power measurement must re-range and re-trigger for every step in the UE's power sequence. To ensure that this process is not interrupted by other operations, it is recommended that you not send any GPIB commands to the test set or press any front panel keys until the measurement has completed.
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No other measurements can be running when a TX dynamic power measurement is performed. If any measurements are running when a TX dynamic power measurement is initiated, they are closed and a message is displayed to indicate that they were closed. Likewise, if any other measurements are initiated while a TX dynamic power measurement is running, the TX dynamic power measurement is closed and a message is displayed.
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The total number of power results returned by the measurement is always 1 +
Number of Power Steps
.
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This measurement does not provide valid results while on a faded channel (see
Digital Bus Information
).
Troubleshooting Techniques
Check to see if an integrity indicator other than 0 (normal) was returned with the measurement result (see
Integrity Indicator
).
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If Trigger Missed (30) is returned, one or more triggers was missed during the measurement. This may occur if you send GPIB commands to the test set or press any front panel keys while the measurement is executing. This may also occur if the measurement is executed while the test set is warming up after power up, due to calibration operations that occur within the test set during the warm-up period.
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If Over Range (5) is returned; the input power exceeded +28 dBm or was greater than +9 dB above the expected power level for one or more steps.
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If Under Range (6) is returned; the input power is below -61 dBm or is less than -9 dB below the expected power level for one or more steps.