| Products > Test Equipment |
| Siglent Technologies SDS1202X-E 200 mhz Digital Oscilloscope 2 Channels |
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| TimFox:
Before I retired, I was surprised at how several junior engineers, who were otherwise quite competent at their jobs, did not understand CRO calibrator outputs and probe compensation adjustment. |
| 13hm13:
Cold boot this morning. Not as distorted as yesterday, but not SQUARE given the probe is connected to Siglent's own, pure 1k sqr generator tab. This is the ENDS issue. Have it both ways, folks, as your are deflecting! But concentrate on the ENDS, not the MEANS: This issue ain't about the USB capture ;) So don't let your dream get distracted ;) ============ MEANS: iPhone capture: ============= MEANS: USB "Print" capture ============= EDIT: I just noticed that for all the images above, my probe switch was on 10x while the scope was MENU-set to 1x. So that may have caused this morning's issue. Returning the probe to 1x made waveform look normal (see below) This looks better, but the Siglent has been warming up for about half hour now, so the issue may very well cont. to exist??? The iPhone capture supports my point that USB Print is not a major issue; in fact, it may be the better storyteller. |
| BillyO:
Did you do the compensation adjustment on your probes in 10X mode? |
| rf-loop:
Your explanation and imges tell that you have not adjusted probe LF compensation. (Probe 10x aka 10:1) Of course when probe is 1x square looks quite ok because when probe is set for 1x this LF compensation do not affect anything. (how you set oscilloscope input probe factor do not matter in this, only what matter is probe itself) But when probe is set for 10x then also this compensation need adjust. In your pictures it is now very clear that it is not adjusted ok and you need do it. You , user, are responsible about it, not Siglent. You need adjust it so that bottom and top is as flat as possible. If you swap probe to other input also then this compensation need check and adjust if need. Because inputs are not perfectly same (capacitance may differ as can see also in data sheet). Then. Everyone knows that user manuals are only for dummies and us old people. ;) Of course, this way one can indirectly reveal that one haven't read the user manual. In first hand, of course, is important to barking that Siglent is complete shit. One could also sometimes ask the mirror. |
| tautech:
--- Quote from: 13hm13 on February 19, 2023, 06:43:03 pm ---This looks better, but the Siglent has been warming up for about half hour now, so the issue may very well cont. to exist??? --- End quote --- Unknown just yet but thank you for some decent imagery. :-+ I strongly suggest you follow rf-loop's instructions as he knows these scope even better than I. Display/Persistence = Infinite will show what a square wave looks like as the unit warms up. Use the probe compensation output and as rf-loop says there is not need for a GND connection and even just use a short length of soft wire. Recommend beforehand to do a Default on the scope and then only adjust the timebase and V/div for the capture although you may need the scope to fully cool again in order to capture this drift you have seen. |
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