Siglent SDS1104X-E Quick Cal Question

[mawyatt]

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/#msg3940957

Best,

[bdunham7]

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.

Just to see how it compared, I had connected the SDS1104X-E calibrator output to my SDS2354X+. I won't bother posting the results, but they were similar to yours--pretty accurate.  It occurred to me that the scope actually might be the most accurate way I have of measuring the calibrator voltages.  So for a challenge, what DMMs can measure the top, bottom, mean, RMS (AC) and RMS (AC+DC) as well or better than the scope? 

[mawyatt]

Yes the SDS2000X+ does a pretty good job. Although both the scope built-in calibrator outputs are not spot on, but the scope readings are good compared with the DMM6500, and we only use the built-in scope calibrator for setting the scope probes anyway.

Here's reading the scope calibrators.


SDS 2102X+         3.053Vpp           1.494Vavg                 1.52Vrms
DMM6500                                      1.51038Vavg              1.49920Vrms

SDS2104X+          3.054Vpp           1.527Vavg                  1.522Vrms
DMM6500                                      1.52161Vavg               1.51038Vrms

Best,

[bdunham7]

Here's reading the scope calibrators.


SDS 2102X+         3.053Vpp           1.494Vavg                 1.52Vrms
DMM6500                                      1.51038Vavg              1.49920Vrms

SDS2104X+          3.054Vpp           1.527Vavg                  1.522Vrms
DMM6500                                      1.52161Vavg               1.51038Vrms

You skipped the top, bottom and p-p numbers with the DMM! 

[mawyatt]

Here's reading the scope calibrators.


SDS 2102X+         3.053Vpp           1.494Vavg                 1.52Vrms
DMM6500                                      1.51038Vavg              1.49920Vrms

SDS2104X+          3.054Vpp           1.527Vavg                  1.522Vrms
DMM6500                                      1.52161Vavg               1.51038Vrms

You skipped the top, bottom and p-p numbers with the DMM!