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am trying to repair my 8596E, new battery and supercap, it does autocalibrate in frequency but does not do data stored (cal: data not stored), I ask if the stored should do it regardless of having autocaled in amplitude . Day and time works regularly.

The manual says that error will occur if there aren't valid amplitude calibration values in use.? Run "CAL FREQ & AMPTD", then store.

Was your supercap defective that you replaced it?? Did you backup your correction constants first?

You probably lost your stored (and valid) amplitude calibration values when you replaced the battery and supercap, which is why it won't store just the frequency values.

-mark

On Sat, Feb 5, 2022 at 01:04 PM, Franco Macciò wrote:

Taken on ebay with battery and 0 volt supercap, even the attenuator is broken, it does not complete the amplitude calibration I think for this reason, I will have to replace it with a new one, I hope that afterwards it will be able to perform the two cals and be able to store the data calibration.

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In the service manual it tells how to record current calibration constants, most likely you will see random data there. Still worth recording. Section 3 of the service manual describes what to do when calibration constants are not valid. I didn't need this step, I recorded constants before battery replacement and didn't lose data, so no firsthand experience. You need to start with something ballpark right to continue with the auto-cal steps.?

Ozan

To be clear, there's the "calibration data" which is the result of the unit's self-cal routines, and then there's the "correction constants" which is the characterization of the attenuator, reference oscillator, etc. that's performed using external equipment.? Both sets of numbers are stored in the battery backed SRAM.

The calibration data is regenerated when the self-cal is run, but without accurate correction constants the unit will not meet its specifications.? If you're battery was dead when you received the unit, you've unfortunately lost your correction constants.? But if you're saying the attenuator was already in need of replacement, you would need to regenerate the correction constants anyway.

Regenerating the correction constants is covered in Section 2 of the Assembly-Level repair manual.

The supercap was probably ok.? It's only there to keep the SRAM running for a few hours while you change the battery.

-mark