Hi,
I will check my notes. I remember there were some GPIB DIAG and INIT commands that are not documented.
If you look at the PS-Cal and SureCal calibration software you will see they can read/write the new values via the power meter GPIB commands. Maybe for the newest sensors it is a little bit more difficult but for the HP branded E4413A that I had it was OK.
Regards,
Razvan
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On May 22, 2025 8:43:32 AM UTC, "F1EKU via groups.io" wrote:
According to HPAK's technical documentation, it's impossible to write new calibration factors into the sensor because each time it requires calculating a checksum that the EPMs of the E4416/17/18/19 series cannot compute. They explain that for this, we must use the newer EPMs from the N1911/12/13/14 series. Personally, I've been able to read a sensor's entire block and write it back into another probe, but changing one or more values within the block always resulted in the inability to initialize the modified probe on an E44XX series power meter. Of course, HPAK uses an external program capable of calculating the checksum when they calibrate a sensor upon request and write the complete block, even with an E44XX power meter. Does anyone know the solution for calculating the checksum?
