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Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes

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Calambres:

--- Quote from: mwb1100 on September 18, 2023, 07:53:18 pm ---These NTP options might help:

  - "Sync" should force a re-synchronization with the NTP server.  You'd have to do this manually, but pushing a button is better then screwing around with the NTP server address

  - "Periodic Sync" on and "Interval" set to 1h should get you an automatic re-sync within an hour.  So if you can live with the time not being right for an hour...

It's too bad the shortest re-sync interval is 1h

--- End quote ---
None of those options worked. Of course the first thing I tried was "Sync" to no avail until I retyped in a new IP address as stated before. Something must be wrong in the NTP coding.



--- Quote from: mwb1100 on September 18, 2023, 08:01:52 pm ---I certainly can't say that a hub from a respected vendor would solve your problems, but I do think there's a really good chance that a hub from a respected vendor would behave better than a 90 cent no name Aliexpress USB hub.
--- End quote ---
Quite possible. ASMOF the problem was greatly reduced once I solved some issues with the hub. I may get a better hub...  ::)


--- Quote from: tautech on September 18, 2023, 08:06:20 pm ---Exactly what you would expect using 10x probes when input settings are set to high sensitivity levels.
Suggest you get some BNC to croc leads and use only 1x input attenuation when noise is a problem.

--- End quote ---

Well, as I said previously, once I took the USB hub out of the equation the noise disappeared. It was not a problem with the probing procedure, it was indeed a problem with the hub. Besides, the signal I was probing was not that low: it was a 400mVpp sinusoidal wave directly from the SDG1062X.

But that is not the possible bug I mention. The bug is in the NTP coding once you change from WLAN to LAN then back to WLAN.



tautech:

--- Quote from: Calambres on September 19, 2023, 06:46:21 am ---
--- Quote from: tautech on September 18, 2023, 08:06:20 pm ---Exactly what you would expect using 10x probes when input settings are set to high sensitivity levels.
Suggest you get some BNC to croc leads and use only 1x input attenuation when noise is a problem.

--- End quote ---

Well, as I said previously, once I took the USB hub out of the equation the noise disappeared. It was not a problem with the probing procedure, it was indeed a problem with the hub. Besides, the signal I was probing was not that low: it was a 400mVpp sinusoidal wave directly from the SDG1062X.

But that is not the possible bug I mention. The bug is in the NTP coding once you change from WLAN to LAN then back to WLAN.

--- End quote ---
Interesting problem.
Have you tried placing the USB WiFi dongle into the front USB and have the USB hub on the rear USB and use only that for storage and the SDG tethering ?
That should give some physical separation between WiFi and the hub if there's interference between them.
BTW, is everything properly mains PE bonded ?

Meanwhile I'll see if I can replicate your findings......

Calambres:

--- Quote from: tautech on September 19, 2023, 07:36:45 am ---Interesting problem.
Have you tried placing the USB WiFi dongle into the front USB and have the USB hub on the rear USB and use only that for storage and the SDG tethering ?
That should give some physical separation between WiFi and the hub if there's interference between them.

--- End quote ---
No but I'm going to try just right now. I'll keep you posted.



--- Quote from: tautech on September 19, 2023, 07:36:45 am ---BTW, is everything properly mains PE bonded ?
--- End quote ---
Sorry but I'm afraid I do not understand you... what's a "mains PE bond"  ::)

Both the scope and the AWG are connected to the same mains line with good earth connection.

tautech:

--- Quote from: Calambres on September 19, 2023, 08:14:11 am ---
--- Quote from: tautech on September 19, 2023, 07:36:45 am ---Interesting problem.
Have you tried placing the USB WiFi dongle into the front USB and have the USB hub on the rear USB and use only that for storage and the SDG tethering ?
That should give some physical separation between WiFi and the hub if there's interference between them.

--- End quote ---
No but I'm going to try just right now. I'll keep you posted.



--- Quote from: tautech on September 19, 2023, 07:36:45 am ---BTW, is everything properly mains PE bonded ?
--- End quote ---
Sorry but I'm afraid I do not understand you... what's a "mains PE bond"  ::)

Both the scope and the AWG are connected to the same mains line with good earth connection.

--- End quote ---
PE = Protective Earth.  ;)

Just done a Bode plot of nothing much and with WiFi USB dongle in the front USB and hub connected to rear USB with storage and SDG connected, no apparent Bode plot trace noise and no loss of the NTP server.....in fact the clock kept advancing after removing the TP Link USB dongle even while connecting to a USB powered wireless LAN which I can use on any instrument that's not able to drive the TP Link USB dongle.

Calambres:
Thanks a lot for your help, Tautech, but I'm afraid that either you didn't understand where the problem is or, more likely, I was not clear enough...  ::)

There are two problems here:

1- The NTP server is not reconnecting when I switch (via Utility menu) from WLAN to LAN and then to WLAN back again. My concern was not related to USB thethering with the SDG for Bode plots at all. My problem is that, as I cannot use USB connection with the SDG for the hub/noise issues, I'm forced to use LAN connection to the SDG and thus I need to switch from the usual WLAN operating state of the scope to LAN, preventing the NTP service to run when, once the Bode Plot operation is finished, I try to return to "business as usual" with WLAN engaged. That is where I think there's a possible bug.

2- My USB hub being crappy, which is not the problem I'm asking for, just presented here as an answer to Pope's request some posts above. The noise problem is not when I'm using Bode Plot but always... the hub induces noise into the scope, although I've just discovered that it is not the only culprit. See later...


I have done what you sugested above and, yes, if I connect the (improved by me but crappy) hub to the back USB port and use it to connect both the SDG connection and the USB memory stick AND connect the WLAN adapter to the front USB port then the noise is gone. Good! but in that position the WLAN adapter fails a lot connecting to the router  |O 

I told some posts above that my router is in a different floor. My shop is in the basement and the router is in the first floor albeit just above from where my shop is. Unfortunately I experienced time ago that just plugging the WLAN adapter directly to either the front or back USB ports in the scope yielded to very weak WiFi connection and was continuously losing and regaining connection. As a solution I bought a USB cable extender to put the WLAN adapter in the upper shelf of my shop gaining a lot of WiFi signal. That is, the solution you presented is not valid for me because having an extender USB cable plugged in the front port is not very practical.

BUT... while fiddling with all these configurations I suspected from that very USB extender cable and, know what?... it is also not shielded, as it was the cable from the hub!... again the chinesium curse strikes me back! it is quite possible that buying a good quality USB extender cable will solve the noise problems I'm having  ::)

But stilll there's a possible bug with the NTP implementation in the scope!  ;)

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