Hami812
Engineering Program Mg
I'm struggling with a Colleague approach to something related to testing Wifi Routers who wishs to perform a Gage R&R on some Routers that have Wifi. There are numerous testers that need to be "Qualified" for production and a gage RnR is required. My colleague suggests, in order to set the "limits for pass and fail" that We should be taking a set of brand new routers which have nothing wrong with them, and testing each one 1 time. THere are 25-30 routers x 1 test (all known good routers). THe parametric I am concerned is the Wifi Power level measured in Dbm value from -10 to -75. UCL is fixed at -10, but there is no LCL. He wants to adjust the LCL (Mfg says it should be -55 dbm, but they are resistant to using this!) tolerance using Cpk by adjusting the Cpk value for each tester instead of trying to get all the testers to reproduce the same result, or ver similar results, then later doing Cpk. Each antena for 5G for Transit (TX) and Receive (RX) and 2.4G Wifi reads a different value for RX and TX. THere are 6 Antennas (3 for each Technology type 2.4 and 5 g) all internally located inside. I perform these tests and what I am finding is inconsistencies between the testers. For example Tester A tests 5 db higher than tester B, but only for Antena 2 (example below). IN most cases the testers are off by at least 5-8 db for both TX Antenna 1,2,3 when compared, and RX 1,2,3 for both 2.4 and 5 G Wifi specifications, sometimes more. This is a ton if your know RF. a movement of just 3 db is double the power or halving it depending on what direction it takes. What is the proper way to conduct preparation for a customer to do a Gage Study. Our customer will do Fixed runs and Rotational runs and they are saying There are 20% more false fails than is expected. What should We do first? I dont think setting tolerances should be done until process is more stable. Can someone weigh in and help me with a methodology for preparing for a Gage R&R? DO you need more info? Uploaded example file
Example data looks like this. Excel formaulas are used
RSSI_Value_5G_1_TX
RSSI_Value_5G_2_TX
RSSI_Value_5G_3_TX
dBm
dBm
dBm
STR
-10
-10
-10
UCL
-46
-62
-49
LCL
-43.0882
-53.2353
-46.8824
AVG
0.7535
2.1611
0.7693
STDEV
-42.0000
-50.0000
-45.0000
MAX
-45.0000
-58.0000
-48.0000
MIN
14.63790968
6.668803916
15.9812135
Cpku
1.288136051
1.351907188
0.917581636
Cpkl
1.288136051
1.351907188
0.917581636
Cpk
Example data looks like this. Excel formaulas are used
RSSI_Value_5G_1_TX
RSSI_Value_5G_2_TX
RSSI_Value_5G_3_TX
dBm
dBm
dBm
STR
-10
-10
-10
UCL
-46
-62
-49
LCL
-43.0882
-53.2353
-46.8824
AVG
0.7535
2.1611
0.7693
STDEV
-42.0000
-50.0000
-45.0000
MAX
-45.0000
-58.0000
-48.0000
MIN
14.63790968
6.668803916
15.9812135
Cpku
1.288136051
1.351907188
0.917581636
Cpkl
1.288136051
1.351907188
0.917581636
Cpk