Products > Test Equipment
Siglent SDS1104X-E and SDS1204X-E: Bode plot with a non-Siglent AWG
4x1md:
Has anybody tried my code with Bode Plot II from the new FW 6.1.33?
MrTick:
--- Quote from: 4x1md on June 01, 2019, 05:01:03 pm ---Has anybody tried my code with Bode Plot II from the new FW 6.1.33?
--- End quote ---
Hi, thanks for the heads up, I've just upgraded my SDS.
I've tested only my ESP SW, though it communicates exactly same like your implementation.
It still works without any problems, no additional AWG verifications were introduced :)
I'm attaching sample sweep output from a diy 40db attenuator.
rf-loop:
--- Quote from: MrTick on June 02, 2019, 09:43:25 am ---
Hi, thanks for the heads up, I've just upgraded my SDS.
I've tested only my ESP SW, though it communicates exactly same like your implementation.
It still works without any problems, no additional AWG verifications were introduced :)
I'm attaching sample sweep output from a diy 40db attenuator.
--- End quote ---
If look your image it looks weird. Exept it tell your AWG is working with Siglent what was perhaps main thing.
But then, your setup and settings are possible totally mess.
What signal goes to reference channel (Ch1)
First make sure your signal source (AWG) output go to your DUT (in your case your selfmade attenuator) input and exactly same signal goes to Ch1 (as long as you have not defined other channel for reference).
Then your DUT (device under test - your attenuator) output goes to Ch2 (because in your image you have selected it (or it is just as scope default).
First it need be sure these signal connections are ok.
Then need look about your BodePlot II settings are right if need.
Basic signal connections (user can free select channels including what is ref channel)
You have measured attenuator but your display show "40 - 60dB" amplifier.
In attached image Ch4 is selected for DUT out but scope factory default is Ch2
(Ch4 is selected for main DUT out in image related to other things = with 1 in 1 out system can keep 1GHz samplerate but also Ch4 is far from Ch1 so it may crosstalk with strong reference signal bit less than Ch2 if need get all out from dynamic range = in basic works just forget this and happy use Ch1 Ch2 pair)
MrTick:
--- Quote from: rf-loop on June 02, 2019, 04:07:03 pm ---If look your image it looks weird. Exept it tell your AWG is working with Siglent what was perhaps main thing.
But then, your setup and settings are possible totally mess.
--- End quote ---
You are totally right.
First I've swapped CH1 and CH2, so the reference was connected wrongly to a CH2 instead of CH1.
That's why all results should be basically multiplied by -1 (or - better, the connection should be fixed and measurements done again).
Second: calling my device a 40dB attenuator is an insult for attenuators :)
It's just bunch metalized resistors soldered together and clamped into a BNC connector, it behaves correctly up till ~10MHz, then it's good only for testing Bode plots :)
aimc:
This looks very interesting. I am wondering though if the scopes communication protocol is the same for serial USB? Did you try to communicate with the Arduino? I am thinking along the line of using one USB (to the scope) and the simple serial connection to the FY6800. The Leonardo (32U4) would be suitable as it has 4 UART's that can be used with the serial(1...n) library. Do you think that is a doable approach? I have worked successfully with asynchronous handshakes between a Leonardo and an ESP, so it would require some changes to your code and of course hardware. Even with USB to the FY6800 (in which case you may need a second MCU for the USB chip) I think this could be a better solution since you don't need to depend on a WiFi connection in your local network. The extra cable and PSU plug pack should not be a problem.
Let me know what you think.
cheers
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