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| Hantek HDG2002B AWG: 5Mhz or 100MHz? Let's see! |
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| Howardlong:
--- Quote from: pascal_sweden on December 02, 2015, 01:11:17 pm --- The new Siglent SDG2000X series can handle a really low rise time. What is the lowest possible rise time on the Hantek HDG2000B series? --- End quote --- I measure it at about 11ns on a square wave on an Agilent MSO7104B 1GHz scope. Amplitude doesn't have a big effect. |
| pascal_sweden:
Good question actually: When measuring the rise time on a signal, the main focus is the output of the signal generator, but if the scope is not meeting specs, it could contribute to a lower measured rise time, isn't it? How to exclude the impact of improper performance of the scope from the actual measurement of the rise time with regards to the signal generator output? |
| Howardlong:
--- Quote from: pascal_sweden on December 02, 2015, 09:41:27 pm ---Good question actually: When measuring the rise time on a signal, the main focus is the output of the signal generator, but if the scope is not meeting specs, it could contribute to a lower measured rise time, isn't it? How to exclude the impact of improper performance of the scope from the actual measurement of the rise time with regards to the signal generator output? --- End quote --- The rise time of that scope has been measured at about 330ps in real time. The system rise time is the square root of the sum of the squares of the individual rise times. The effect of the 330ps scope rise time is therefore negligible on the DUT rise time when the system rise time is 11ns. |
| Mark_O:
--- Quote from: pascal_sweden on December 02, 2015, 09:41:27 pm ---Good question actually: --- End quote --- Silly question, actually. --- Quote ---How to exclude the impact of improper performance of the scope from the actual measurement of the rise time with regards to the signal generator output? --- End quote --- If the scope is performing improperly, you CAN"T exclude the impact on the measurements. :palm: You switch to a working scope. ~~ Howard answered a completely different question, which is, how do you compensate for limitations in measurement in one instrument, when attempting to evaluate another instrument? With the answer being that when there is more than an order of magnitude difference in the contribution from the two, the impact on the net result will be minimal. |
| Berni:
Okay here are some performance tests of my Hantek using a 4GHz scope. Small square waves get a 6.8 ns rise time on mine Large square waves are a bit faster at 6ns but look at all that ringing Then the akilies heel of DDS signal generators, an oddball non integer output frequency(4.95MHz in this case). Yeah tons of jitter due to being at only 250MS/s fixed. Here is some more analysis on that. As you can see its actually outputting two frequencies that are close, having them average out to 4.95MHz in the long term And here is a 19MHz Sine wave spectrum, there is jitter in there too as you can see by the two modulated side band tones on each side of the main sinewave. |
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