Products > Test Equipment
Sniffing the Rigol's internal I2C bus
olsenn:
I've read several reports that 300MHz has been enabled in the DS2000 (not 'A') scopes, but that it wasn't actually providing 300MHz? Can anybody confirm or deny this? Also, can the lo-z input be toggled from the menu now?
Rigby:
--- Quote from: olsenn on December 09, 2013, 06:16:03 pm ---I've read several reports that 300MHz has been enabled in the DS2000 (not 'A') scopes, but that it wasn't actually providing 300MHz? Can anybody confirm or deny this? Also, can the lo-z input be toggled from the menu now?
--- End quote ---
Enabled, yes. Actually 300MHz? I don't know. The 50ohm impedance is present only on the A models and I believe this is a change in the actual hardware that is only present on the A models.
mtdoc:
--- Quote from: olsenn on December 09, 2013, 06:16:03 pm ---I've read several reports that 300MHz has been enabled in the DS2000 (not 'A') scopes, but that it wasn't actually providing 300MHz? Can anybody confirm or deny this? Also, can the lo-z input be toggled from the menu now?
--- End quote ---
If you look back a few weeks in this thread you'll see that actual 300MHz bandwidth has been confirmed by several posters by both rise time measurements and -3dB frequency testing.
Personally, I don't have the equipment to confirm the actual bandwidth on mine but I can confirm that it is >200MHz.
marmad:
--- Quote from: Rigby on December 09, 2013, 06:44:00 pm ---The 50ohm impedance is present only on the A models and I believe this is a change in the actual hardware that is only present on the A models.
--- End quote ---
I believe the DS2000A is HW identical to the DS2000 HW revision 2.0 - except perhaps for some jumpers or setting pull-up resistors. I think Rigol designed the new PCBs to be able to be used for filling existing DS2000 orders - while starting up production of the new A and A-S models.
I think the ONLY reason 50 Ohm impedance (and CAN trigger/decoding) is not available on non-A HW revision 2.0 models is product differentiation.
Rigby:
--- Quote from: marmad on December 09, 2013, 06:54:36 pm ---I believe the DS2000A is HW identical to the DS2000 HW revision 2.0 - except perhaps for some jumpers or setting pull-up resistors.
--- End quote ---
Are you basing that on anything known? I mean no offense. You've been saying this for a while, so clearly you're sure. I've not seen any proof (enable A features on hardware sold as non-A) yet.
--- Quote from: marmad on December 09, 2013, 06:54:36 pm ---I think Rigol designed the new PCBs to be able to be used for filling existing DS2000 orders - while starting up production of the new A and A-S models.
--- End quote ---
Backward compatibility on new hardware does not necessitate forward compatibility on old hardware. You're probably right, and I think we'll eventually discover a serial number "line in the sand" or board revision where the inclusion of the 50-ohm option starts.
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