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Testing risetime and bandwidth with a Siglent SDS2102X Plus
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Yellie:
Hi,

I received a Siglent SDS2102X Plus scope a few days ago and wanted to the test the specs. First I connected the 200 MHz probe to the build in calibrating 1 Khz. squarewave and expected a risetime around 3.5 nsec but the display shows 3.4 usec. A different of 1000 times slower. The second check I did, after activating the option for the build in AWG, to display a 10 MHz. squarewave. I connected the 50 ohm AWG output to the 50 ohm impedance input by a 50 coax (Aircell 7) and BNC. A disappointing sinewave was the result on the screen.
The questions: 1 - Is it a misunderstanding that the risetime must be 3.5 nsec with a squarewave or is it a theoretical value? 2 - I updated my Siglent temporaly for this test to 350 MHz and in that case I expected that a 10 MHz squarewave must be shown as a real squarewave on the screen. Maybe the build in AWG cannot generate a real 10 Mhz squarewave or is the bandwidth of the scope still to small? 3 - Are there others with the same experience? I attached some pictures of my tests.

Thanks so far
delvo:
The calibration signal is not really meant for that. It doesnt have a great rise/fall time. I compared with my SDS1104X-E which is upgraded to 200MHz. The test signals rise time is around 1us.
The "disappointing sine wave" you see is a result of the rise/fall time of the AWG. A 10MHz square wave has a period of 100ns. So it is positive for 50ns. The rise/fall time for the AWG is specified at <24ns. So it really cant look like a square wave at that speed anymore.
Yellie:
Hi Delvo,

Thanks for the quick reply. I was a little bit confused and expected to see a nice 10 MHz squarewave on the 350 MHz bandwidth scope. So the main problem is the internal AWG of the scope? I don’t have an external high speed AWG but in that case my SDS2102X Plus (with 2352X Plus specs now…) has to show a nice 10 MHz squarewave? Are there others they did such a test? I’m very interested in that.

Best regards
delvo:
The problem is really generating the square wave. I have a SDG2042X which has much better specs than the integrated AWG and its rise/fall time is not enough to get a nice looking 10MHz wave. Im sure it will look good when you get a good square wave source.
Yellie:
That makes me feel confident and I’m glad to hear that. Thanks again.
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