MTK APC校准不过，但展讯的能过，是CMU有问题吗？

CMU这些校准仪器不了解，现在在生产MTK6260的手机，校准的时候APC总是不过。提示RF Stop failed (Possibly non-recoverable error occurred)。但是在校准展讯芯片的通讯模块时，就可以过。不知道是为什么，ATE刚发过来时900 1800 INP LOSS和OUT LOSS分别是0.4 0.8，现在改的是2.0 2.4 ，不知道这个改的大了，会不会把CMU烧坏?哪位朋友知道给讲讲。

改LOSS烧坏CMU? ，APC　FAIL得把校准log晒出来

我只是猜的，因为这些天原来好好的机器，都测不过了，所以就这样怀疑。LOG太长，截了最后一段。
2015/07/03 09:29:55.062 PCL =12 ,Measure_power = 19.229810, WANTED_P= 19.000000 ,DAC_Value= 207
2015/07/03 09:29:55.140 Adaptive C[5.000000]
2015/07/03 09:29:55.171 t_loop =3 ,RampApcLevelReq.apc_dac = 205
2015/07/03 09:29:55.203 [GPIB] ----RCT_GGE_APCDCOffset_Iteration----
2015/07/03 09:29:55.203 [GPIB] 0: SENS:LEV:MAX 29.0
2015/07/03 09:29:55.203 [GPIB] 0: RFAN:CHAN 40 CH
2015/07/03 09:29:55.203 [GPIB] CONF:RFAN:TPCL 12;*OPC?
2015/07/03 09:29:55.203 [GPIB] 0: 1
2015/07/03 09:29:55.265 [GPIB] READ:POW?
2015/07/03 09:29:55.343 [GPIB] 0: 1.907504E+001,1.922034E+001,0.000000E+000,MATC,1.908804E+001
2015/07/03 09:29:55.343 PCL =12 ,Measure_power = 19.075040, WANTED_P= 19.000000 ,DAC_Value= 205
2015/07/03 09:29:55.453 [GPIB] ----RCT_GGE_APCDCOffset_Iteration----
2015/07/03 09:29:55.453 [GPIB] 0: SENS:LEV:MAX 31.0
2015/07/03 09:29:55.453 [GPIB] 0: RFAN:CHAN 40 CH
2015/07/03 09:29:55.453 [GPIB] CONF:RFAN:TPCL 11;*OPC?
2015/07/03 09:29:55.484 [GPIB] 0: 1
2015/07/03 09:29:55.546 [GPIB] READ:POW?
2015/07/03 09:29:55.640 [GPIB] 0: 2.181962E+001,2.195480E+001,0.000000E+000,MATC,2.180702E+001
2015/07/03 09:29:55.640 Measure_power = 21.819620
2015/07/03 09:29:55.734 RampApcLevelReq.apc_dac = 253
2015/07/03 09:29:55.734 Adaptive C[5.000000]
2015/07/03 09:29:55.765 t_loop =0 ,RampApcLevelReq.apc_dac = 248
2015/07/03 09:29:55.781 [GPIB] ----RCT_GGE_APCDCOffset_Iteration----
2015/07/03 09:29:55.781 [GPIB] 0: SENS:LEV:MAX 31.0
2015/07/03 09:29:55.781 [GPIB] 0: RFAN:CHAN 40 CH
2015/07/03 09:29:55.781 [GPIB] CONF:RFAN:TPCL 11;*OPC?
2015/07/03 09:29:55.781 [GPIB] 0: 1
2015/07/03 09:29:55.843 [GPIB] READ:POW?
2015/07/03 09:29:55.921 [GPIB] 0: 2.156410E+001,2.170472E+001,0.000000E+000,MATC,2.156514E+001
2015/07/03 09:29:55.921 PCL =11 ,Measure_power = 21.564100, WANTED_P= 21.000000 ,DAC_Value= 248
2015/07/03 09:29:56.015 Adaptive C[5.000000]
2015/07/03 09:29:56.046 t_loop =1 ,RampApcLevelReq.apc_dac = 245
2015/07/03 09:29:56.078 [GPIB] ----RCT_GGE_APCDCOffset_Iteration----
2015/07/03 09:29:56.078 [GPIB] 0: SENS:LEV:MAX 31.0
2015/07/03 09:29:56.078 [GPIB] 0: RFAN:CHAN 40 CH
2015/07/03 09:29:56.078 [GPIB] CONF:RFAN:TPCL 11;*OPC?
2015/07/03 09:29:56.078 [GPIB] 0: 1
2015/07/03 09:29:56.140 [GPIB] READ:POW?
2015/07/03 09:29:56.218 [GPIB] 0: 2.138710E+001,2.154359E+001,0.000000E+000,MATC,2.139471E+001
2015/07/03 09:29:56.218 PCL =11 ,Measure_power = 21.387100, WANTED_P= 21.000000 ,DAC_Value= 245
2015/07/03 09:29:56.312 Adaptive C[5.000000]
2015/07/03 09:29:56.343 t_loop =2 ,RampApcLevelReq.apc_dac = 243
2015/07/03 09:29:56.375 [GPIB] ----RCT_GGE_APCDCOffset_Iteration----
2015/07/03 09:29:56.375 [GPIB] 0: SENS:LEV:MAX 31.0
2015/07/03 09:29:56.375 [GPIB] 0: RFAN:CHAN 40 CH
2015/07/03 09:29:56.375 [GPIB] CONF:RFAN:TPCL 11;*OPC?
2015/07/03 09:29:56.375 [GPIB] 0: 1
2015/07/03 09:29:56.437 [GPIB] READ:POW?
2015/07/03 09:29:56.515 [GPIB] 0: 2.130542E+001,2.144758E+001,0.000000E+000,MATC,2.130519E+001
2015/07/03 09:29:56.515 PCL =11 ,Measure_power = 21.305420, WANTED_P= 21.000000 ,DAC_Value= 243
2015/07/03 09:29:56.609 Adaptive C[5.000000]
2015/07/03 09:29:56.640 t_loop =3 ,RampApcLevelReq.apc_dac = 241
2015/07/03 09:29:56.671 [GPIB] ----RCT_GGE_APCDCOffset_Iteration----
2015/07/03 09:29:56.671 [GPIB] 0: SENS:LEV:MAX 31.0
2015/07/03 09:29:56.671 [GPIB] 0: RFAN:CHAN 40 CH
2015/07/03 09:29:56.671 [GPIB] CONF:RFAN:TPCL 11;*OPC?
2015/07/03 09:29:56.671 [GPIB] 0: 1
2015/07/03 09:29:56.734 [GPIB] READ:POW?
2015/07/03 09:29:56.828 [GPIB] 0: 2.137862E+001,2.150655E+001,0.000000E+000,MATC,2.136274E+001
2015/07/03 09:29:56.828 PCL =11 ,Measure_power = 21.378620, WANTED_P= 21.000000 ,DAC_Value= 241
2015/07/03 09:29:56.906 Adaptive C[5.000000]
2015/07/03 09:29:56.937 t_loop =4 ,RampApcLevelReq.apc_dac = 239
2015/07/03 09:29:56.953 [GPIB] ----RCT_GGE_APCDCOffset_Iteration----
2015/07/03 09:29:56.953 [GPIB] 0: SENS:LEV:MAX 31.0
2015/07/03 09:29:56.953 [GPIB] 0: RFAN:CHAN 40 CH
2015/07/03 09:29:56.953 [GPIB] CONF:RFAN:TPCL 11;*OPC?
2015/07/03 09:29:56.953 [GPIB] 0: 1
2015/07/03 09:29:57.015 [GPIB] READ:POW?
2015/07/03 09:29:57.093 [GPIB] 0: 2.125396E+001,2.139464E+001,0.000000E+000,MATC,2.125582E+001
2015/07/03 09:29:57.093 PCL =11 ,Measure_power = 21.253960, WANTED_P= 21.000000 ,DAC_Value= 239
2015/07/03 09:29:57.187 Adaptive C[5.000000]
2015/07/03 09:29:57.203 t_loop =5 ,RampApcLevelReq.apc_dac = 237
2015/07/03 09:29:57.218 [GPIB] ----RCT_GGE_APCDCOffset_Iteration----
2015/07/03 09:29:57.218 [GPIB] 0: SENS:LEV:MAX 31.0
2015/07/03 09:29:57.218 [GPIB] 0: RFAN:CHAN 40 CH
2015/07/03 09:29:57.218 [GPIB] CONF:RFAN:TPCL 11;*OPC?
2015/07/03 09:29:57.234 [GPIB] 0: 1
2015/07/03 09:29:57.296 [GPIB] READ:POW?
2015/07/03 09:29:57.375 [GPIB] 0: 2.113720E+001,2.128455E+001,0.000000E+000,MATC,2.112897E+001
2015/07/03 09:29:57.375 PCL =11 ,Measure_power = 21.137200, WANTED_P= 21.000000 ,DAC_Value= 237
2015/07/03 09:29:57.468 Adaptive C[5.000000]
2015/07/03 09:29:57.500 t_loop =6 ,RampApcLevelReq.apc_dac = 236
2015/07/03 09:29:57.531 [GPIB] ----RCT_GGE_APCDCOffset_Iteration----
2015/07/03 09:29:57.531 [GPIB] 0: SENS:LEV:MAX 31.0
2015/07/03 09:29:57.531 [GPIB] 0: RFAN:CHAN 40 CH
2015/07/03 09:29:57.531 [GPIB] CONF:RFAN:TPCL 11;*OPC?
2015/07/03 09:29:57.531 [GPIB] 0: 1
2015/07/03 09:29:57.593 [GPIB] READ:POW?
2015/07/03 09:29:57.671 [GPIB] 0: 2.109371E+001,2.122420E+001,0.000000E+000,MATC,2.109577E+001
2015/07/03 09:29:57.671 PCL =11 ,Measure_power = 21.093710, WANTED_P= 21.000000 ,DAC_Value= 236
2015/07/03 09:29:57.796 [GPIB] ----RCT_GGE_APCDCOffset_Iteration----
2015/07/03 09:29:57.796 [GPIB] 0: SENS:LEV:MAX 33.0
2015/07/03 09:29:57.796 [GPIB] 0: RFAN:CHAN 40 CH
2015/07/03 09:29:57.796 [GPIB] CONF:RFAN:TPCL 10;*OPC?
2015/07/03 09:29:57.812 [GPIB] 0: 1
2015/07/03 09:29:57.875 [GPIB] READ:POW?
2015/07/03 09:29:57.984 [GPIB] 0: 2.390427E+001,2.403675E+001,0.000000E+000,MATC,2.389322E+001
2015/07/03 09:29:57.984 Measure_power = 23.904270
2015/07/03 09:29:58.062 RampApcLevelReq.apc_dac = 298
2015/07/03 09:29:58.062 Adaptive C[5.000000]
2015/07/03 09:29:58.093 t_loop =0 ,RampApcLevelReq.apc_dac = 293
2015/07/03 09:29:58.125 [GPIB] ----RCT_GGE_APCDCOffset_Iteration----
2015/07/03 09:29:58.125 [GPIB] 0: SENS:LEV:MAX 33.0
2015/07/03 09:29:58.125 [GPIB] 0: RFAN:CHAN 40 CH
2015/07/03 09:29:58.125 [GPIB] CONF:RFAN:TPCL 10;*OPC?
2015/07/03 09:29:58.125 [GPIB] 0: 1
2015/07/03 09:29:58.187 [GPIB] READ:POW?
2015/07/03 09:30:01.968 [GPIB] 0: NAN,NAN,NAN,NTRG,NAN
2015/07/03 09:30:03.843 [！FATAL！] RF Stop failed: (Possibly non-recoverable error occurred)
GSM_APC_FETCH_TX_MEASUREMENT_FAILED => 242

MTK 几乎全是这个242不过，

看下是不是电源限流了，掉电了。小功率下校准没有问题，功率校准上去后电流增大，主板有掉电可能。

把电源线加粗或者搞短一点试试，还可以加个大电容

从哪里可以看出来是掉电啦，麻烦解答下

好的，我试试，多谢指导，试完了再来汇报

好的，我试试，多谢指导。大电容是在正负极线之间吗?我用的是HP66312A电源。

首先，你这个LOG看不出来什么问题，你是把线损加大了，展讯可以过，不一定MTK就能过，不一样的平台，测试也不一样，把电压加到4V看看可以吗