Products > Test Equipment
RIGOL DP711 and DP712 new 1ch PSU
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Eric-H:
Good work!

The remaining question is then: how did you calculate the crc over the license data? It the algorithm that Rigol uses known?
ElectronMan:
Passed a couple of known good instances of the data with checksum to reveng with instructions to discover/dump CRC parameters;


--- Code: ---reveng.exe -w 16 -s 03000008710300000871020000000000000000a111 030000087103000008710000000000000000006776
width=16  poly=0x1021  init=0xebcc  refin=false  refout=false  xorout=0x0000  check=0x6809  residue=0x0000  name=(none)
--- End code ---

Then pass the parameters back in with instructions to calculate the checksum for the data i want:


--- Code: ---reveng -w 16 -p 1021 -i ebcc -c 02000008710200000871020000000000000000
046f
--- End code ---

And Bob's your uncle :)
Eric-H:
I opened my DP711 but could not find the FRAM chip. Is it located at the bottom side of the board?

I did see that a smal cap (47 uF / 50V) had vented its electrolite :(, so I will have to replace it.
Dwaine:

--- Quote from: Eric-H on March 16, 2017, 07:38:59 am ---I opened my DP711 but could not find the FRAM chip. Is it located at the bottom side of the board?

I did see that a smal cap (47 uF / 50V) had vented its electrolite :(, so I will have to replace it.

--- End quote ---

You are joking right.  These power supplies are new.  That's warranty for sure

Wow.   
Eric-H:
I did have to break the "Warranty void if removed"-sticker to find the bad cap. :P
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