Advantest R3132 Calibration Error

[Zinger Liu]

Hello experts,

I got a Caliration Error [801] which is  "LOG LINEARITY: Calibration failure." when I warmed up my R3132 after 30 mins or more. But if I turned off the machine and powered up it after cooling down, then tried to do "Cal All" just after powered up, every thing was fine. Anyone knows what's the problem?

Thanks a lot!