Out of curiosity we quickly checked our two SDS2000X+ after an 1/2 warm up utilizing a custom designed DMM/Scope calibration/checker (see link below) which produces a very accurate 2.5V squarewave. The checker is based upon an accurate 5.000 volt reference that is chopped into a precise 50% duty cycle waveform which yields an output of 5.00VPP, 2.50V average and 2.50V RMS. The checker is directly connected to the scope as shown below.
We had utilized this setup before to confirm the SDS scope readings with the checker before reporting some measurements on a important project, and one reason why this calibration/checker was developed some time ago.
First we confirmed the Checker with a DMM6500 at 250Hz, 500Hz and 1KHz (get similar results with the KS34465A).
250Hz 2.500060Vdc average and 2.499500Vrms
500Hz 2.500275Vdc average and 2.499318Vrms
1KHz 2.500154Vdc average and 2.498913Vrms
This confirms an accurate 5Vpp squarewave for the source. We used the SDS Waveform Amplitude feature for the Vpp reading to reduce the possibility of capturing a overshoot peak condition, and the 10Bit acquisition mode. Note: Also used the ERES (3 bit) and the results were very similar.
@250Hz @500Hz @1KHz
SDS2102X+ 5.010Vpp, 2.484Vavg 5.017Vpp, 2.484Vavg 5.023Vpp, 2.848Vavg
SDS2104X+ 5.011Vpp, 2.509Vavg 5.016Vpp, 2.509Vavg 5.017Vpp, 2.509Vavg
Anyway, these two SDS scopes are still performing well and we have been very happy with them.
https://www.eevblog.com/forum/testgear/ac-rms-dmm-tests/msg3940957/#msg3940957Best,