Channel Power Measurement Troubleshooting

NOTE

If the access probe power measurement is on and waiting to measure a probe, all other measurements (except digital average power) will not be able to execute. It is therefore recommended that you turn off the access probe power measurement before attempting any other measurement.

• The test set receiver's expected signal amplitude and frequency must be set up correctly for accurate measurements. This is normally done automatically and the expected power is shown on the Channel Power measurement screen (see Channel Power Measurement Results ).
  
  If you are manually controlling the test set's receiver (see Receiver Control ), be certain that you have entered the correct frequency and power values for your test setup.
• The actual measurement speed used by the test set may be different than the current measurement speed selection. This is primarily because the triggering and search algorithms needed for measuring channel power on gated input signals is only available when using the Normal measurement speed. If Fast or Very Fast measurement speeds are selected when the channel configuration is such that a gated signal could reasonably be expected from the mobile station the Normal measurement speed algorithm will be applied even though a different measurement speed is selected. This provides the highest confidence that the measurement result will be accurate even though it might take longer than expected to obtain the result. See Measurement Speed for details.
• To help avoid over range or under range integrity indicators, correct for system path loss (see Amplitude Offset ).
• If you are manually controlling the test set's receiver, be certain that you have entered the correct frequency and power values for your test setup (see Receiver Control ).
• Calibrating the Channel Power Measurement
• During remote operation of this measurement, you should configure the Trigger Arm to Single. See SETup:CPOWer:CONTinuous or SETup[:ALL]:CONTinuous<:OFF|:ON> . If single triggering is used during manual operation, press the START SINGLE key to trigger each measurement. See Triggering of Measurements for details on trigger settings.

Troubleshooting Techniques

Check to see if an integrity indicator other than 0 (normal) was returned with a measurement result (see Integrity Indicator ).

• 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.
• 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 signal has both over range and under range conditions, only the over range (5) will be indicated.

  Channel Power Under Range/Over Range Integrity Indicators

  

Other Considerations

• To help avoid over range or under range integrity indicators, correct for system path loss (see Amplitude Offset ).
• If you are manually controlling the test set's receiver, be certain that you have entered the correct frequency and power values for your test setup (see Receiver Control ).
• Calibrating the Channel Power Measurement

Related Topics

Troubleshooting Setting Power Levels

Channel Power Measurement Description