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Siglent SDM3045X - Enough is enough

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Pinkus:
OK, here are the NSP files which were requested.
Pulled from SDM3045x with installed patched SDM3055x-e firmware from the directory /usr/bin/siglent/usr/config/

If these files exist multiple times in different directories and if I copied them from the wrong directory, please send a short message.

n3mmr:
So I've patched the 3055x-e fw, and now I'm thinking of upgrading my 3045x with this patched fw.

Can someone remind me how to revert to 3045x if this bricks my DMM?

n3mmr:

--- Quote from: n3mmr on January 12, 2022, 01:42:19 pm ---So I've patched the 3055x-e fw, and now I'm thinking of upgrading my 3045x with this patched fw.

Can someone remind me how to revert to 3045x if this bricks my DMM?

--- End quote ---

And after a while I realised I had two more DMMs of sufficient quality for immediate needs, so I upgraded and tested.

Things look good, at least initially.
I don't have any voltage or current sources accurate enough for verification, but the last digit seems stable, which all on its own makes the "upgrade" actually useful.

Also, for some reason, 0.2, 2 and 20 volts seem much more natural. Probably a deeply hidden memory of when I last worked in an electronic lab. Some fifty years ago!

How can you get hold of accurate calibration sources w/o ruining your economy?

pcmihnea:

--- Quote from: n3mmr on January 12, 2022, 07:05:04 pm ---
--- Quote from: n3mmr on January 12, 2022, 01:42:19 pm ---So I've patched the 3055x-e fw, and now I'm thinking of upgrading my 3045x with this patched fw.

Can someone remind me how to revert to 3045x if this bricks my DMM?

--- End quote ---

And after a while I realised I had two more DMMs of sufficient quality for immediate needs, so I upgraded and tested.

Things look good, at least initially.
I don't have any voltage or current sources accurate enough for verification, but the last digit seems stable, which all on its own makes the "upgrade" actually useful.

Also, for some reason, 0.2, 2 and 20 volts seem much more natural. Probably a deeply hidden memory of when I last worked in an electronic lab. Some fifty years ago!

How can you get hold of accurate calibration sources w/o ruining your economy?

--- End quote ---

Can you compare the options available in the menus, for eg. the custom temperature menu added in the latest SDM3045X FW (https://siglentna.com/wp-content/uploads/dlm_uploads/2021/09/SDM3045X-Firmware-Revise-History.pdf)? If it's available, the FW for SDM3055X-E may be up to date with SDM3045X.
You could also issue the SCPI *IDN? command to check if it returns any different info.

Kleinstein:
DC cal source are available, espeically if the only have to be resonable stable and not accurate, with a good meter to compare too.

The tricky part is the AC side. Here a good source for the higher voltage higher frequency can get quite expensive.

As the hardware is still the same, it is not clear if the meter with the 3055 firmware still uses the old 3048 calibration data. It may work, as the HW is still the same and they may use a compatible and maybe the same format. Hower this is not for sure, especially as different cal points are used.
Without suitable cal data some ranges may be quite a bit out.
 

A reasonabe good test would be checking a DC voltages of some 2 V in the 2 and 20 V range and see if both read reasonable (within the accuracy of the 3048) the same. This would test the input divider and here idividual units can scatter quite a bit. So wrong cal data would likely produce different readings.
A similar (maybe even easier) could be done with resistors in different ranges (the very low end may not help here, as the 200 mV and 2 V range likely are done with the ADC internal gain and this is naturally quite close to nominal.

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