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why do I loose calibration when HP8752A is switched off

Question asked by Eric003 on Sep 30, 2020
Latest reply on Oct 16, 2020 by Eric003

I recently acquired a HP8752A . This is a wonderful VNA.

But I have a question:

Each time when I have stored a calibration in internal memory I loose the entire calibration when the VNA is switched OFF.

-- is this normal behaviour ?

I also checked that the internal buffered RAM had its 5V by the buffer capacitor, it keeps the volatage over days !

-- has anyone an idea what goes wrong or do I wrong?