Products > Test Equipment
New Rigol DS1054Z oscilloscope
2N3055:
The whole point is that even 1mV/div and 2 mV/div is software magnified "resolution...
Meaning 500uV/div is not only 5 bits of resolution in theory (less than that ENOB) it also has offset and drift from 3 steps up.... And also noise that is from much larger range. If there were not so much noise, you could clearly see discrete 32 steps over whole screen....
Therefore not very useful.
RoGeorge:
500uV/div is very handy, especially when the scope is in high resolution mode, same for the averaging mode ("Acquire" -> "Mode" set to "Average") when the signal is very small but repetitive.
As an example measuring very small resistances (millioms range) with the oscilloscope, like measuring a contact resistance, or the internal resistance of a battery, etc:
https://www.eevblog.com/forum/projects/oscilloscope-with-trace-averaging-as-a-lock-in-amplifier-(rigol-ds1054z)/
I have the 500uV/div option since the very beginning, and it works very well, despite the urban legend that it would be bad. It's a software option. It brings no damage and no inconvenience to any other options. Can be removed later if not wanted.
Fungus:
--- Quote from: RoGeorge on March 15, 2022, 11:25:00 am ---500uV/div is very handy, especially when the scope is in high resolution mode, same for the averaging mode ("Acquire" -> "Mode" set to "Average") when the signal is very small but repetitive.
As an example measuring very small resistances with the oscilloscope, milliohms range, for a contact resistance, or the internal resistance of a battery, etc):
https://www.eevblog.com/forum/projects/oscilloscope-with-trace-averaging-as-a-lock-in-amplifier-(rigol-ds1054z)/
--- End quote ---
Yep.
--- Quote from: RoGeorge on March 15, 2022, 11:25:00 am ---I have the 500uV/div option since the very beginning, and it works very well, despite the urban legend that it's bad. It's a software option. It brings no damage and no inconvenience to any other options. Can be removed later if not wanted.
--- End quote ---
As I noted earlier, it's said that self-cal doesn't calibrate that range so maybe you have to get lucky for it to work. If it doesn't work then it's annoying to have that feature enabled - you can't just whizz the scale to the lowest possible range, you have to whizz then go back one notch.
Is anybody up for a definitive test? Can you apply a small voltage to one of the inputs then do a self-cal and see if the 500uV range changes?
(I don't have my DS1054Z any more so I can't do it)
RoGeorge:
--- Quote from: Fungus on March 15, 2022, 11:34:08 am ---Is anybody up for a definitive test? Can you apply a small voltage to one of the inputs then do a self-cal and see if the 500uV range changes?
(I don't have my DS1054Z any more so I can't do it)
--- End quote ---
I'm not curious to find that, because either way (included in self-calibration or not) I've used 500uV/div many times, and found it very useful, even when the zero has a small offset from the grid.
Then, if 500uV is software only (just a 2x vertical zoom on the screen), then it might be nothing to calibrate about it.
Fungus:
--- Quote from: RoGeorge on March 15, 2022, 12:04:28 pm ---
--- Quote from: Fungus on March 15, 2022, 11:34:08 am ---Is anybody up for a definitive test? Can you apply a small voltage to one of the inputs then do a self-cal and see if the 500uV range changes?
--- End quote ---
I'm not curious to find that
--- End quote ---
Not even in the name of science?
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