Out of curiosity, what reference frequency did you use for the -3dB bandwidth calculation ?
No calculations are required when you have a 3.2 GHz RF gen. ![Wink ;)](https://www.eevblog.com/forum/Smileys/default/xwink.gif.pagespeed.ic.cldandycH0.png)
Only a check levels are correct at some base frequency before pushing upward, we used 100 MHz 1V p-p as mentioned here:
https://www.eevblog.com/forum/testgear/bandwidth-limit-on-siglent-sds2000x-plus-oscilloscope/msg4968844/#msg4968844
Otherwise if using the Bodnar pulser, it provides extremely fast edges @ 10 MHz
OK. Thanks Tautech.
I did not realize that Siglent had specified the BW performance verification test differently for the SDS2000X Plus.
In the service manual for the SDS2000X HD, section 5.4, Siglent specify using 1 Mhz as the frequency for the reference level when working out the bandwidth performance.
Regards.
Not exactly.
Tests are done
starting at 1 MHz to beyond DSO rated BW.
Eg, for SDS2104X HD all the below frequencies are used and documented for verification checks = does it or not pass a Cal.
1M, 1.14M, 1.31M, 1.50M, 1.72M, 1.97M, 2.25M, 2.57M, 2.95M, 3.37M, 3.86M, 4.42M, 5.06M, 5.79M, 6.63M, 7.59M, 8.69M, 9.94M, 11.38M, 13.03M, 14.91M, 17.07M, 19.54M, 22.36M, 25.60M, 29.30M, 33.54M, 38.39M, 43.94M, 50.30M, 57.58M, 65.90M, 75.43M, 86.35M, 100.00M, 113.14M, 129.51M, 148.24M, 169.68M, 200.00M
This will be an automated test using the prescribed Fluke 9500B oscilloscope calibrator.
Few of us have such a beast therefore just finding the -3dB BW rolloff is quite sufficient for our needs.
Typical method is set source to 1V p-p and start winding up frequency until the scope displays 0.707V p-p from a 1V sinewave input. Just don't forget it need be done using a 50 Ohm system.
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/xwink.gif.pagespeed.ic.cldandycH0.png)