Products > Test Equipment
Upgrading the Hantek DSO4072C and DS4104C oscilloscopes bandwidth up to 250MHz
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rlohmann:
Hi all,

I finally received the missing ICs required to get the function generator to life.

Two items I notices, hoping someone could help me with ...

I noticed that some resistor arrays (RA1601-RA1604) close to the DAC (U62) are missing. Does anybody know the used resistance?

I also ordered a BNC-connector by guessing, but noticed it does not fit. Does anybody has part number for those?
tinhead:
these not populated Relais for 50R input, they asking to get populated ^^ Wondering only if you guys change the model number, the 50R will get enabled in firmware?
Microcheap:

--- Quote from: rlohmann on March 13, 2019, 09:11:47 pm ---I noticed that some resistor arrays (RA1601-RA1604) close to the DAC (U62) are missing. Does anybody know the used resistance?

--- End quote ---

I found some pictures I took when I disassembled my scope, I hope it will be helpful.
rlohmann:
Hi just schort update.

It took a while to get the parts and the time to put them together.

But finally, after adding the missing parts:

 - DAC902E (U62)
 - 4x 20Rx4 (RA1601-RA1604)

 - EL5166ISZ (U63)
 - BAV99 (D1501)

 - and a somewhat fitting BNC-connector,

and the function generator appears to work. :)

Only the bandwidth seems to be low.
Sinus looses amplitude @ f > 1Mhz (as I remember) ... Will look into that later on.


 

Microcheap:
The problem may be calibration. There is a file called dds_calbration.dat (sic) in the folder /config/root that I suppose contains calibration data for the function generator. The calibration is made at the factory, and I think the devices without DDS option won't have this file. I don't know if it is possible to calibrate de DDS later but you can try to copy the file from another device, obviously it is not ideal, as this calibration data is unique for each device but it may improve things a bit.
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