Products > Test Equipment

Sniffing the Rigol's internal I2C bus

<< < (577/899) > >>

Rigby:
It means that you can restrict the bandwidth of the scope to either 20MHz or 100MHz when you want to.

So, you buy a 200MHz or 300MHz scope, but you're looking at a signal that is much closer to 20MHz, then you would want to turn on the 20MHz limit and cut out a lot of higher frequency noise.

Mark_O:

--- Quote from: Rigby on February 06, 2014, 09:51:03 pm ---It means that you can restrict the bandwidth of the scope to either 20MHz or 100MHz when you want to.

So, you buy a 200MHz or 300MHz scope, but you're looking at a signal that is much closer to 20MHz, then you would want to turn on the 20MHz limit and cut out a lot of higher frequency noise.

--- End quote ---

Bandwidth limiting will certainly reduce HF noise.  However if that 20MHz signal you're examining happens to be a square wave, you wouldn't want to BW limit it... unless you preferred seeing a sine wave instead.  A 20 MHz BW Limit would be effective at dealing with noise on signals <=5 MHz though.  Without compromising signal integrity too much.

More often, the BW Limiting is used when you reduce the sample rate.  If the Sa-rate is low, any components in your signal >2x Sa will result in aliasing.  BW Limiting knocks those out.   :box:

excapealex:
Ok, but it is just a software filtering not hardware.. Right?
It may not be that the 20MHz filter is hardware and 100MHz filter software (enabled together with the unlock of the bandwith at 300MHz) or both hardware and this is the difference between the 2072A and the 2302A?

Teneyes:

--- Quote from: excapealex on February 06, 2014, 10:51:22 pm ---Ok, but it is just a software filtering not hardware.. Right?

--- End quote ---
@Excapealex No , In a past post and Teardown, you can see there is a Hardware variable Bandwidth Amplifier in the DS2000 (4000, 6000) . This hardware has BW filtering Modes selectable by control bits. The modes are 20,100,200, 350, ......MHz.
So it is hardware filtering. In one past version of FW , 20,100 and 200MHz were available.

excapealex:

--- Quote from: Teneyes on February 06, 2014, 11:02:27 pm ---@Excapealex No , In a past post and Teardown, you can see there is a Hardware variable Bandwidth Amplifier in the DS2000 (4000, 6000) . This hardware has BW filtering Modes selectable by control bits. The modes are 20,100,200, 350, ......MHz.
So it is hardware filtering. In one past version of FW , 20,100 and 200MHz were available.

--- End quote ---
Excellent, just what I was hoping for!
Thank you!

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod