Products > Test Equipment

DG4000 - a firmware investigation

<< < (19/96) > >>

Harvs:

--- Quote from: Mark_O on November 16, 2013, 11:19:18 pm ---
--- Quote from: TMM on November 16, 2013, 10:06:51 am ---Looks like the analog bandwidth is 160Mhz. Still worth modding to DG4202 for the 5Mhz Ramp though  :-+

--- End quote ---

TMM, that conclusion assumes the measuring device (scope) is itself perfectly flat to 200 MHz.  Thus the falloff is completely due to the generator.  That's unlikely to be the case.

--- End quote ---
Yes, I wouldn't go as far as drawing any conclusions yet.  We need someone with a scope with significantly higher bandwidth to test this one.


--- Quote ---Also, Harvs wrote:

> Using a short coax and 50ohm term. <

and an external 50-ohm terminator does not eliminate the internal capacitance on the front end.  I'm assuming he's using one of the DS2000-series scopes.

--- End quote ---

Yes as stated, a DS2202.

I posted this as more of an encouragement for someone on here to post a sweep taken with much higher performance equipment.

elCap:
I'm unlucky  :'(...  I have a DG4102 with a serial number starting with DG4B1. cybernet's program requires DG4D1..
Guess I have to take the JTAG route.. Anyway, thanks for your work!! :-+

cybernet:

--- Quote from: elCap on November 17, 2013, 03:16:32 am ---I'm unlucky  :'(...  I have a DG4102 with a serial number starting with DG4B1. cybernet's program requires DG4D1..
Guess I have to take the JTAG route.. Anyway, thanks for your work!! :-+

--- End quote ---

change the strcmp in the code ....

elCap:

--- Quote from: cybernet on November 17, 2013, 03:18:18 am ---
--- Quote from: elCap on November 17, 2013, 03:16:32 am ---I'm unlucky  :'(...  I have a DG4102 with a serial number starting with DG4B1. cybernet's program requires DG4D1..
Guess I have to take the JTAG route.. Anyway, thanks for your work!! :-+

--- End quote ---

change the strcmp in the code ....

--- End quote ---

Thanks!! It worked perfect!  :)

By the way, I have version 01.02. I will upgrade to 01.07 now.

TMM:

--- Quote from: Mark_O on November 16, 2013, 11:19:18 pm ---
--- Quote from: TMM on November 16, 2013, 10:06:51 am ---Looks like the analog bandwidth is 160Mhz. Still worth modding to DG4202 for the 5Mhz Ramp though  :-+

--- End quote ---

TMM, that conclusion assumes the measuring device (scope) is itself perfectly flat to 200 MHz.  Thus the falloff is completely due to the generator.  That's unlikely to be the case.
--- End quote ---
We can assume the DS2202 does a bit better than 200MHz so it is a little less than 3dB (70.7% p-p) down at 200MHz. From that you can conclude that the bandwidth of the function gen falls between 100MHz and 200MHz. You wouldn't expect a function gen to be less than 6dB down at 200MHz if it's bandwidth was 60MHz.
Spec for the DG4162 states <-0.8dB @ 160MHz. Spec at 100MHz and 60MHz is identical to the lower models so you can bet money that the hardware is no different.

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