Products > Test Equipment
Sniffing the Rigol's internal I2C bus
NikWing:
@AndersAnd: ahh, thank you, I misunderstood that then :)
so if a 100 MHz DSO is unlocked to 300, 200/100 and 20 should appear?
neslekkim:
--- Quote from: AndersAnd on December 10, 2013, 05:17:14 pm ---
--- Quote from: NikWing on December 10, 2013, 05:10:34 pm ---but I also read about unlocking it to 300, but the bw filter menu won't show that setting, it seems
--- End quote ---
It's not supposed to. BW limit filters in scopes are low pass filters you can activate to reduce the full BW of the scope. Without BW limit activated, you get the full specified BW of the scope so there should be no 300 MHz option on a 300 MHz model, just like there's no 200 MHz option on a 200 MHz model or a 100 MHz option on a 100 MHz model. You'll only see selected BW options below the scopes full BW.
--- End quote ---
Yeah, but I thougt the issue is that if you get an 2072, hack it to be an 2302, do you then get 100 and 200 as options in that list?
AndersAnd:
--- Quote from: NikWing on December 10, 2013, 05:20:09 pm ---@AndersAnd: ahh, thank you, I misunderstood that then :)
so if a 100 MHz DSO is unlocked to 300, 200/100 and 20 should appear?
--- End quote ---
There's no 200 MHz option on either DS2202A or DS2302A. Only 100 MHz and 20 MHz will appear on these.
On both DS2072A and DS2102A only 20 MHz will appear.
Th 200 MHz BW limit will option will appear on non-A models with an old FW modded to DS2302. (A scope model that has never been released, so 200 MHz BW limit has never been an official option).
This has already been mentioned a couple of times recently in this topic:
--- Quote from: JDubU on December 10, 2013, 05:05:31 am ---
--- Quote from: stormbr on December 10, 2013, 02:49:36 am ---Works fine with ds2072 (non a) and hardware 2.0.
Model: DS2302
SW: 00.02.01.00.03
HW: 1.0.2.0.2
FPGA: SPU 03.01.09 / WPU 00.07.01 / CCU 12.29.00 / MCU 02.12
Note:
Need uninstall the old key with ultra sigma.
Option: DSHH + rigen 2b1
Protocol analysis CAN: ok
300MHz BW: ok
BW limit: OFF - 20M - 100M
--- End quote ---
If the bandwidth is 300MHz, shouldn't the BW limit menu options be: OFF - 20MHz - 100MHz - 200MHz?
Is the bandwidth actually still 200MHZ and not 300MHz?
Never mind...
The DS2000A User's Guide, page 2-3 says:
"Enable bandwidth limit and limit the bandwidth to 20 MHz or 100 MHz (only applicable to 200 MHz and 300 MHz oscilloscopes), the high frequency components that exceed 20 MHz or 100 MHz are attenuated."
--- End quote ---
--- Quote from: marmad on December 10, 2013, 03:46:41 pm ---The v.2 FW does NOT have a 200MHz bandwidth limit switch for the channels (as evidenced by the DS2000A User Manual) - so it's correct that the option does not appear in the menus.
--- End quote ---
flolic:
--- Quote from: neslekkim on December 10, 2013, 05:24:01 pm ---Yeah, but I thougt the issue is that if you get an 2072, hack it to be an 2302, do you then get 100 and 200 as options in that list?
--- End quote ---
My hacked 2072 (latest firmware and cybernet's latest license codes) has this options: OFF/20M/100M
Dave Turner:
Alank2 - yes it was your post that I recalled. As a matter of note I discovered that the limit appears to be 800uV. It is below that that the trace either bottoms or tops out.
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