The TX dynamic power measurement does not run concurrently with any other measurements. If any measurements are running, they are closed when TX dynamic power measurement is initiated, and a message is displayed indicating that a measurement has been closed. Activating another measurement inactivates the TX dynamic power measurement.
Possible Setup Issues
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The TX dynamic power measurement is not performed with a data connection established between the test set and AT. Rather, you must place your AT 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 set the test set's receiver using manual control, with the power set to match the initial transmit power of the AT's power sequence, and with the frequency set to match the AT's transmit frequency (see
Receiver Control
).
-
You must set the
Power Step Size
,
Number Of Power Steps
and
Power Step Time
parameters (see
TX Dynamic Power Measurement Parameters
) to match the power sequence to be transmitted by the AT.
-
During front panel operation of this measurement, you must press the
START SINGLE
key to initiate the measurement.
-
Once the measurement has been initiated, the AT must trigger the measurement with an RF rise (a positive change in power from 20 dB below the initial transmit power).
-
Ensure that you have met the
TX Dynamic Power Input Signal Requirements
.
-
Before performing a TX dynamic power measurement, ensure that the measurement has been properly calibrated (see
Calibrating the TX Dynamic Power Measurement
).
-
Ensure that you have entered the proper
Amplitude Offset
values for your test setup.
-
Ensure that you set the
Measurement Timeout
to a value great enough to allow you to command the AT to transmit its power sequence and for the test set to measure the power sequence.
-
For front panel graph control, the
Start Step
and the
Span
settings can not add up to more than 100. Otherwise, the new value will be rejected with an error indicating "Upper limit exceeded".
-
See also
Operating Considerations
.
Troubleshooting Techniques
Check to see if an integrity indicator other than 0 (normal) was returned with a measurement result (see
Integrity Indicator
).
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If Trigger Missed (30) is returned, one or more triggers were missed during the AT's power sequence measurement. This can prevent the TX dynamic power measurement from hanging and provide an early termination for the measurement.
-
If Over Range (5) is returned; the input power has exceeded +37 dBm or is greater than +9 dB above the expected power level of the receiver.
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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 of the receiver.
-
If the measurement has both over range and under range conditions, only the over range (5) will be indicated.
-
If the measurement has several errors, the error which has the highest priority will be indicated.