Products > Test Equipment
New Rigol DS1054Z oscilloscope
2N3055:
--- 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 (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.
--- End quote ---
It is not an urban legend. I had DS1074Z.
It was useless for normal work compared to scopes with real 500uV/div range.
Anything less than 4mV/div (in fine mode you can set 4mv/div) is software magnified. Meaning :
2mV/div 128 levels.
1mV/div 64 levels
500uV/div 32 levels
I remember 2mV was quite OK, and 1mV was usable. There is already quite some noise so ENOB is already at 6 bit level anyways..
In that topic you are using averaging for an impromptu "lock in amplifier" effect.
That will "excavate" signal out of the noise and interpolate low bit count.
As I said there it is quite clever and creative use.
But you are correct. It hurts nobody if you enable it..
And occasionally someone clever like you can use it for something useful.
RoGeorge:
Indeed, I never use 500uV/div other than in averaging mode.
Rigol DS1054Z is very noisy for mV range signals, especially when compared with old analog scopes, though those were way more expensive to buy new, and not many were having a 500uV/div option.
About internal noise, my DS1054Z measures about 1mVpp noise with no probes, 500uV/div, 5ms/div, no bandwidth limit, no average and all 4 channels on. For some reason CH3 is much noisier, showing 1.35mVpp noise. :-//
5mV/s includes the mains 50Hz hum noises, maybe some 1/f noises too, because at 5ns/div the measured Vpp noise becomes about 2-3 times smaller.
At very fast sweeps, there is also a small artifact, like a 1-2mVpp wiggle for about 10ns around the sync point. This is easier to notice in averaging mode. It is more visible on the channel used for sync. This wiggle seems to be there no matter what. It happens at 1mV/div, too, just that it shows half amplitude in the wiggling.
In term of offset deviations, on mine the traces have less than +/- 0.5div offset on 500uV/div, and half of that at 1mV/div. The offset can shift with time, in 30-60 minutes for example going from +0.5 to -0.5 div because of temperature changes.
Datman:
Hi
Does the v00.04.05.02.00 2021/07/24 update affect the 100MHz limit? It is more than an option...
If bandwidth comes back to 50MHz, can I reapply Riglol for 100MHz? I think yes... Can you confirm?
Thanks
Gianluca
Shock:
The updates haven't disabled any licensing. If they were to change the licensing scheme all customers would need to acquire reissued licenses. It would become a nightmare.
Fungus:
--- Quote from: Datman on March 17, 2022, 10:26:48 pm ---Does the v00.04.05.02.00 2021/07/24 update affect the 100MHz limit?
--- End quote ---
No.
(and an update never will)
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version