Says who ?
If all instruments used to verify accuracy meet or better the factory Cal instrument spec and they are within their Cal period then what is the problem ?
It´s not that easy...
We´re Iso certified(not only), everything we use in the testfield* must be fully traceable calibrated from an external DAkkS certified lab.
DAkkS are worldwide accepted even in MIL/Aero ranges(It will be enough when our equipment is calibrated according to ISO, but this must be done from a lab with "higher" Standard (DAkkS) ).
To be clearer, as I´ve bought the siglent scopes for our testfield the first thing was to send them to the lab for calibrating.
Because with the one sheet of cal-cert paper which lies in the package you can wipe your a** with.
For private usage it´s ok because you don´t need any certified things.
When we buy a scope from lecroy, there is always a complete calibration protocol with individual values attached.
Fully traceable including a cal-sticker (valid until...).
Even the "cheap" Wavesurfer come with it.
R&S, Keysight, Tektronix also.
It´s a "Pro-Standard", of course you can´t expect that on the "low-cost" models from siglent, so it was no surprise they came with nothing in this way.
But if we would buy for example a SDS6000A model, we would expect the same individual documentation we get from the "Pros".
And not only a fore-printed one sheet of paper which says nothing, this is not pro-standard.
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