Power versus Time Troubleshooting

Possible Setup Issues

During remote operation of the Power versus Time measurement you should configure the trigger arm to single, see SETup:PVTime:CONTinuous[:SELected] .

If the trigger arm is not set to single, the measurement may not return a result. When trigger arm is continuous the measurement rearms itself and starts another measurement cycle, during remote operation the FETCh query may not be synchronized to the measurement cycle, see Measurement States .

If the Trigger Source is set to RF Rise and the signal measured is not burst modulated the measurement will wait until aborted or timed out.

If the input signal does not rise above the threshold set at 20 to 30 dB below the Expected Power, see Expected Power there is not enough power to generate an RF Rise trigger so the measurement may hang.

Time Offset Range Restrictions for GPRS Mobiles

When you want to perform a Power versus Time measurement on a GPRS mobile which supports a two uplink multislot configuration, there are restricted ranges for the power offset times to ensure that a valid result is returned. This restriction is a function of the expected power for each burst and the guard period as shown in the table below.

Interpreting Integrity Indicator values

See Integrity Indicator .

If over range (5) is returned; the PvT input power has exceeded the test set's internal sampler maximum value during some part of the sampling or the input power has exceeded the calibrated range of the test set's power detector for the RF Range setting. RF Range is automatically set based on the input power setting. Input power is a combination of amplitude offset and expected power settings. See Mobile Station Receiver Example .

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

If under range (6) is returned; the PvT Transmit Power result is more than 10 dB below the expected input power level. Under range is also indicated if, the input power is more than 2 dB below the calibrated range of the test set's power detector for the RF Range setting. RF Range is automatically set based on the input power setting. Input power is a combination of amplitude offset and expected power settings. See Mobile Station Receiver Example .