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| Siglent Technologies SDS1202X-E 200 mhz Digital Oscilloscope 2 Channels |
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| bdunham7:
--- Quote from: 13hm13 on February 19, 2023, 08:48:34 pm ---Cold-boot reliability still on wait-n-see ... --- End quote --- The only thing that I can think of that would cause this and be internal to the scope would be if the input capacitance of a particular channel were changing. I think it is pretty unlikely that the calibrator output would misbehave so as to cause that display, but if you have another scope, you can check easily enough. If the problem is changing input capacitance, testing with the probe set to 1X isn't going to help. Instead, if you try this fairly simple procedure I think you can figure out if and where there is a problem. 1) Connect a probe to each channel, set to 10X, and connect both of them to the calibrator output. Remove (completely) and set aside both ground clips, you don't need them and they might cause confusing results. 2) Set both channels identically so that the calibrator signal appears on screen and the two signals are right on top of one another. It doesn't actually matter whether you select 1X or 10X on the scope, but just to keep things straight use 10X. 3) After the scope is all warmed up, adjust each probe's compensation as needed for the nicest square edge you can manage. Observe for a little bit and make sure the display is very stable and the traces are right on top of one another. You can alternately select each channel and it should be right on top of the other one, as if there was only one trace. 4) Turn the scope off overnight or for as long as you think it needs to cool down. Turn it back on and see if there is any problem. |
| Hank69:
Some time ago last year, (May 2022), I ordered a Rigol DS1202Z-E from big A and I found myself adjusting the wrong channel with the STUPID, one knob control for both vertical channels. I had to constantly "remind" myself of what channel I was currently using. Back then I found and reported a bug that when any vertical adjustment was made to either channel, the other channel's ground reference "jumped" upward by 15-20 mV. Even pushing either channels vertical button to zero the channel to the horizontal grid line would make the other channel jump. I was currently looking for a scope to use for my "retirement hobby" projects and as I was checking the latest Rigol firmware updates, there were NO FW updates issued from the time this bug was reported to the present time. BUT, the most important factor that steered me to the Siglent SDS1202X-E was the separate vertical controls. The max 14M point-single/7M-dual channel memory of the Siglent is more than sufficient for home use and works very well. I discovered that the Siglent's top right freq window does not report signals < 10Hz and if you select the freq option in the measurements window it will report nicely a 7.38Hz signal as shown in the pix. Accurate freq measurements can also be obtained via cursor measurement. I enjoy the colors used in the yellow/blue trace display as there is no mistaking channel data on the screen. I can totally recommend the Siglent even though it costs a bit more, but, having separate vertical controls is mandatory in my mind.... P.S. IF you are still having issues with the operation I would strongly suggest to contact Siglent and take advantage of the three year warranty. Worth a shot.... |
| 13hm13:
About my probes ... pretty std. Velleman 100 mhz, 1x/10 x probes. Not high end but typical probes (2010 price) puch'd at a local electronics shop. See: https://www.jameco.com/z/PROBE100-Velleman-4-Foot-100MHz-Oscilloscope-Probe-Set_2130618.html About my issue ... "Auto Setup" seems to be the magic button, at least for warm boots. It fixes everything. If I don't press Auto Setup, and warm boot OFF---> ON (the flashing power button, in standby mode I assume) , and have the probe connected to the front-panel 1k sqrwave / gnd tap for self test, I get a horizontally rolling pattern. I must go into Trigger Setup, and manually select Source (CH1 or 2) and Slope Falling (but sometimes either Rising or Falling will stop the rolling ...... WTF!!!!!!!!!!!!!). Not sure about Cold Boot. I don't have lot of time to invest in this experiment. Bottom line: After the 1k square wave looks good, square and steady ... and I unplug the device as is ... and re-plug and pwr on, a day or two later, with the probe still connected to 1k test tap, the Siglent should show the SAME steady 1k square wave, EXACTLY as when I pulled the plug. My Tek 465 can do that. |
| tautech:
--- Quote from: 13hm13 on February 20, 2023, 06:55:25 am ---Bottom line: After the 1k square wave looks good, square and steady ... and I unplug the device as is ... and re-plug and pwr on, a day or two later, with the probe still connected to 1k test tap, the Siglent should show the SAME steady 1k square wave, EXACTLY as when I pulled the plug. My Tek 465 can do that. --- End quote --- There is your problem, you MUST power down with the front panel button for this scope to save settings. I mentioned this 2 days ago. :horse: |
| 2N3055:
Let me reiterate what so far several people told you: Modern scopes are NOT anything alike your Tek 465. They are basically computers put in scope case. You have to boot them, and shutdown them nicely. Like computer. They have literally 10s of triggers and trigger modes. But they don't have alternate trigger. Modern digital scopes are much more powerful than old analog ones. They also don't have some stuff old ones had, some stuff because they are digital and some because people changed the way we use scopes.. But that brings both complexity and new ways of thinking, before we are able to use them them to full extent. They don't have physical switches. You set them up from menus. What software remembers is important. You can set scope to boot every time to a reset state. That is default. You can also go into menu and set them to boot to any combination you like. You can save many different setups and recall them. Digital scopes are different. Bottom line is that you seem to not understand exactly how to use digital scope and you need to read the manual to learn how. You will have to invest time. Otherwise you will never know how to use it properly.. I understand your frustration. But that is just how the world is today. Take it or leave it. I have same problem with these new cars. There are quite few today that don't even have a knob to set heating. You set it on a stupid touchscreen. It annoys me to no end. But I had to drive one few days ago and I had to learn how to navigate menus because alternative was to freeze because I refuse to learn how to do it. That seemed stupid, because I don't like cold. So I spent few minutes learning to navigate menu system.. I was still annoyed by why is world going in that direction but I was able to operate it so it serves my purpose. Being stubborn at your own expense is never good choice.. |
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