Products > Test Equipment
DG4000 - a firmware investigation
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
Go to full version