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| Siglent Technologies SDS1202X-E - FREQ MEASUREMENT CAPABILITIES.... |
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| Hank69:
I am looking at the above scope for home hobby work and specifically in the lower frequency range. I understand that this unit "may" have issues measuring/displaying low frequencies, I.E. < 100, <10 HZ. From what I've read the unit has a hardware freq counter and not sure if also an actually measured value is process by the scope CPU itself. Any replies from users that may have used this model to measure/display the low frequency stuff will be appreciated.... Thanks, Hank P.S. I have seen pictured units with a display of f=500.000 HZ - top right corner of scope and this would leave one to believe it may be capable, but, can't trust the advertising illustrators.... |
| tautech:
Typically 10 Hz is as low as you can go however for the 4ch version the recently added Counter allows for lower frequencies and the other rule of thumb is to have a full period displayed rather than just a part of one. Frequency measure and HW counter start displaying instability below 10 Hz. HW counter results are dependant on trigger levels and this can be used to advantage at times. Some SDS1104X-E screenshots attached FYI showing simple measure, Statistics, Counter and at top right the HW counter. Signal source SDG6022X |
| Hank69:
tautech, Thanks for the reply. I will just order this SDS1202X-E and run it through it's paces. I totally agree to have the scope give you the best information you have to "feed" it at least one or more waveforms to get the picture.... I was able to measure in the 5.xx Hz range, sub 10 Hz with my Hanktek DSO2C15 and thought a "better" scope - Siglent - would have equal to or better performance than a scope half the cost.... |
| bdunham7:
--- Quote from: Hank69 on February 16, 2023, 03:52:11 pm ---I will just order this SDS1202X-E and run it through it's paces. I totally agree to have the scope give you the best information you have to "feed" it at least one or more waveforms to get the picture.... I was able to measure in the 5.xx Hz range, sub 10 Hz with my Hanktek DSO2C15 and thought a "better" scope - Siglent - would have equal to or better performance than a scope half the cost.... --- End quote --- I'd highly recommend you consider the SDS1104X-E instead. I know it is more money, but it is also much more than a 4-channel version of th SDS1202X-E. I wouldn't generally rate scopes based on one seldom-used (by most) feature, although of course you should consider what is important to you. The 1104X-E has 3 different frequency counters. The first trigger-based simple counter, the most basic, goes down to 10Hz. The hardware counter is reciprocal and goes down to 2.00000Hz, although it appears there can be issues with this at the very limits depending on your capture length and so forth. The measurements menu has a frequency counter that works explicitly with the screen capture so you have to set the scope up correctly to get this to work. However, it goes well below 2 Hz, although with not so many decimals. I'm conducting an experiment now to see how low I can get it to go--I'll post it in a while. Finally, you always can use the cursors and measure frequency manually. Since the slowest sweep speed is 100s/div, in theory you could get down below .001Hz. You would have to be very patient! |
| bdunham7:
So here are some very low frequency measurement examples. These captures take a long time (1400 seconds!) but in the first two you can see the result from the measurements menu, which requires at least two trigger events to be in the capture (on the screen). It accurately measures 10mHz and then 2mHz. When you try to do 1mHz, you run into the problem that even though an entire waveform fits, you might not have two trigger events dependign on random luck. In the third picture, the meeasurement has failed because there of where the waveform is. It might work on another capture. So the lowest guaranteed reading would be about the point where you have two full waveforms on the screen, or about 1.42mHz. If you use the manual method and cursors, in theory you could measure about half that, or about 714µHz. Obviously you probably won't need to go that ridiculously low, but that's how you go about it. AFAIK, the SDS1202X-E will do this last method and cursors, but doesn't have the hardware counter. |
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