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| A review of the GWInstek 1054B |
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| saturation:
Yes, I stand corrected. The maker knows more than I. Its been almost a year and so far I have experienced 3 events that I cannot reproduce. Recently, a locked up happened with a long equation using the advanced math function requiring a power down, but since then the full equation or individual functions within haven't caused a lock up. Another the scope control response slowed on 4 channels that didn't return when 3 other channels were deselected. it required the default button to be pressed [ soft reset to factory settings]. Once the FFT had no output after being deselected and then reselected, it reappeared after selecting advance math then FFT again, setting preserved. The only uniform event was the scope was on for several hours monitoring a circuit, or I was waking the scope from backlight sleep mode, but I've done all 3 issues many times since and can't get it to repeat. So yes, in summary there are bugs. --- Quote from: Fungus on February 05, 2017, 07:44:15 pm --- --- Quote from: saturation on February 05, 2017, 06:18:57 pm ---1.Fixed the system crash randomly which caused by the ¡§Advance Math¡¨ function --- End quote --- No comment. :popcorn: --- End quote --- |
| Fungus:
--- Quote from: saturation on February 05, 2017, 09:43:44 pm ---So yes, in summary there are bugs. --- End quote --- Good to know, thanks! |
| MrAl:
Hello there, Very nice thread. Lots of helpful information for someone who is looking at new scopes and does not want to spend a fortune. Special thanks to 'saturation' for doing so much work on this. It's kind of hard to weed out the bad ones with little information on the practical use in real life, so it is nice to see all this. I see one thing in particular that is interesting but not sure how exactly to interpret. The rise time test showed about 3.8ns and i wondered what setting the scope was on to get that. I noticed some of the scopes have a 1ns setting, so i wondered if we could get a raw ADC view on the scope. If in fact they use a true 1GSPS ADC then we should be able to see, somehow, about 0v at say 10ns and say +5v at 11ns (10ns plus 1ns). Is that the way these DSO's can work, or do they obtain that 1GSPS sampling rate by doing several scans of the same waveform coming in in real time? Or, do they do some intermediate work on the wave which would bring it up to 4ns instead of 1ns? BTW what is that scope rated for in rise time? I am hoping that they use a true 1GSPS ADC chip of some kind combined with fast memory when they advertise as 1GSPS of course. I am rather new to the DSO's as i had and have used many CRT scopes in teh past including 10 thousand dollar CRT storage scopes, but only used two DSO's so far and only for a short time, so i dont know much about what to look for and what to watch out for. Thanks for any additional info like this. |
| MrW0lf:
Test request due to this thread: https://www.eevblog.com/forum/testgear/opinions-on-gw-instek-scopes/msg1131021/#msg1131021 Please check analog bandwith with Sin(x)/x ON|OFF, with all 4 channels ON to minimize sampling rate. |
| saturation:
Hi, that's a good idea worth detailing. You cannot turn off Sin(x) interpolation, so for comparison I'll use dot mode vs vector mode and automated measurements. I no longer have access to the 8640B, so the comparisons are against the -3dB point, ~ 120 MHz using an RF Explorer Signal Generator as an RF source. Baseline measurement -3dB at 120 MHz is 9.88mVpp. Automated measures uses whole buffer for calculation, so set as GATING OFF. At 2 CH or 500MSa/s the -3dB point is reduce to 110 MHz. At 3 CH or 250MSa/s the frequency is read correctly but the low sampling causes more error in the automated measures of Vpp. No difference at 3CH or 4 CH since the sampling rate is the same. At 120 MHz, just shy of the Nyquist n/2 limit, the waveforms are unstable and the frequency counter gives erroneous count. At 250 MSa/s the automated readings are near the same 1 GSa/s at <= 80 MHz. Baseline 1 GSa/s at 80 MHz to compare against 250 MSa/s. --- Quote from: MrW0lf on February 07, 2017, 11:23:02 am ---Test request due to this thread: https://www.eevblog.com/forum/testgear/opinions-on-gw-instek-scopes/msg1131021/#msg1131021 Please check analog bandwith with Sin(x)/x ON|OFF, with all 4 channels ON to minimize sampling rate. --- End quote --- |
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