Products > Test Equipment
Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China
Martin72:
Testing update rates...
Will make a table next weekend, here some pics from the HDs update rate signal.
Looks plausible to me, just what you'd expect from it.
Max Wfms/s normal mode 108690, sequence mode 568180.
So far, so good.
Then the rigol scope...WTF... ;)
As far it could get same settings, normal mode, no measures active, auto memory, one channel active.
Now hold your breath, the maxmimum rate is 1666730 Wfms/s :scared:
The second fast is also above the million, 1111060 Wfms/s....
This couldn´t be the normal acquisition mode, never ever... 8)
Two reasons why:
Rigol itself claimed about 50000 Wfms/s in normal mode, the trigger output signals are in packages just like you were in sequence mode.
With a timebase of 2µs, it´s the first time the rigol drops down and comes near the 50k, 47619 Wfms/s.
The siglent reaches 4762 Wfms/s BUT 45454 Wfms/s in sequence mode.
This not normal mode what you have on the rigol...
(Note: rigol_normal_20ns screenshot was cutted below, for what reason ever )
Martin72:
In ultra acquistion mode you get the same results, more or less.
One difference, the pauses between the packages are way more longer, inbetween seconds(maybe depending on the frame/timeout settings)..
teddychn:
Hi Martin,
One thing I'm very happy with my current SDS2074X plus. Unlike previous HP/Agilent or Tek scopes, one need to juggle the auto/normal mode around to get single mode or roll mode worked as expected. We could change it easily between all the modes in a click on Siglent. Does Rigol have the same or similar benefit?
Thanks!
Martin72:
Hi teddychn,
In this case the siglent sds2000X plus got the best direct access.
And unfortunately the "default" and "auto setup" buttons are directly touchable on the rigol (on the same height like the other buttons).
This is the price you must pay for a smaller design I guess, altough there´s a little space left on the front, see pic.
Roll mode you can access via the acquire menu ( just press the acquire button on the front or touch the horizontal icon on the screen (or the field with the samplerate)).
Roll mode is either auto or off - the "scale" shows 50ms, but you can´t change it, maybe reserved for future firmware update.
Tomorrow is the last day/evening I can do something on the rigol, times was flying away.
Martin
maxwell3e10:
Regarding update rate, the time structure of triggers is indeed very uneven. So I used a frequency counter to measure the trig out frequency (reciprocal method) over a 1 sec gate time. With one channel on the update rate is indeed around 50k over a wide range of horizontal time scales. But it drops very quickly with more channels on:
1 ch on: 55k
2 ch on: 17k
3 ch on: 7k
4 cn on: 5k
Turning on high-resolution mode does not affect the update rate. Turning on average (for 1k points) reduces the update rate to about half (for each number of channels turned on).
The high frequency response is pretty good, the signal amplitude goes to about 84% at 800 MHz and 64% at 1 GHz.
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