Channel Power Troubleshooting

Possible Setup Issues

• During remote operation of the channel power measurement it is recommended that you configure the trigger arm to single (see SETup:WCPower:CONTinuous ). If the trigger arm is not set to single, you may not be able to retrieve measurement results during remote use if you are using the INIT:DONE? query. When the trigger arm is continuous, the measurement rearms itself and starts another measurement cycle, causing the INIT:DONE? query to always return "WAIT". See Trigger Arm (Single or Continuous) Description for more explanation.
• The trigger source defaults to Auto for the channel power measurement, and tries to use protocol triggering if the mobile station (UE) is synchronized to the test set. Immediate triggering is used if the mobile station is not synchronized. While on a faded channel (see Digital Bus Information ), the measurement will only return valid results if Trigger Source is set to Immediate or RF Rise .
• RF Rise triggering should only be used when a burst is sent, such as a PRACH burst.
• Trigger Source can only be set to HS-DPCCH when Channel Type = 12.2k RMC + HSDPA or 12.2k RMC + HSPA .
• Measurement results are affected by any amplitude offsets that are entered. See Amplitude Offset .
• The channel power measurement value may be slightly lower than the thermal power measurement's value (typically about 0.25 dB). This is because the channel power measurement is band-limited, rejecting the additional power that may be in the uplink signal's sidebands.
• Ensure that the measurement has been properly calibrated (see Channel Power Measurement Calibration ).
• Ensure that you are meeting the Channel Power Input Signal Requirements . If Auto Range is set to off, you must set the expected power level from the UE as described in Manual Power Range Offset . If Auto Range is on, the UE's output power must be stable in order for the autoranging algorithm to operate properly.
• The RMSCubed results are only available when RMSCubed State is set to on.

Interpreting Integrity Indicator Values

If Over Range (5) is returned, the measured signal exceeds the expected input level or exceeds the maximum allowed input power for the test set. See Auto Range and Manual Power Range Offset .

If Under Range (6) is returned, the measured signal is below the expected input level.

If Uncalibrated Due to Temperature (19) is returned, the temperature in the test set has changed by ± 10° C or more since the last calibration and should be calibrated again. See Calibrating the Test Set .

See Integrity Indicator .

Related Topics

Channel Power Measurement Description