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| REVIEW - Rigol DS2072 - First Impressions of the DS2000 series from Rigol |
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| Wim13:
It is the difference of the clock rate of the DSO, and ofcourse related to the sample rate, and the input frequency. So you can also measure the real clock frequency of the DSO My DSO is about 3 Khz off at 2 Ghz, so that gives an error of less then 0,25 % If you can, slowly change the input frequency just below till just above the multiple of the internal clock, you can also see some beat frequency wave in the non zoom window. And in zoom mode there can be only one trigger point, that why when 1 trigger point you dont see that. Then the DSO can compensates for the phase differences. |
| Carrington:
--- Quote from: Wim13 on November 29, 2013, 04:37:58 pm ---It is the difference of the clock rate of the DSO, and ofcourse related to the sample rate, and the input frequency. --- End quote --- Clock rate of the DSO? Frequency at which the signal is digitally processed or something like that. :-// I edit to correct it, sorry. |
| Wim13:
All these test equipment has a master clock, on my DG4102 i use a Rubidium master clock, and also for my HP equipment. And on most equipment is an external connection for a master clock. It is a pitty that the DS2000 has no input for a master clock, that makes i more difficult to use it in combination with other equipment. ( phase differences... ) |
| marmad:
--- Quote from: Wim13 on November 29, 2013, 04:37:58 pm ---It is the difference of the clock rate of the DSO, and ofcourse related to the sample rate, and the input frequency. --- End quote --- @Wim: I don't see any difference in the variation based on the input frequency. I just ran a test @ 100us/div [Zoom 500ns/div] testing different frequencies from 10kHz to 1MHz. The size of the jitter/offset is constant - exactly what I mentioned before - of plus or minus one sample period, i.e. in this case ±100ns (100MSa/s). |
| Wim13:
@Marmad, thats is corect, only the speed of the phase difference changes. Because the DSO has only one reference. So if you vary the inout freq. the speed of the phase diferences will change, you can see that also, change the DSO screen you see a alias. |
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