Offset adjustment

[radiofarol]

Does someone tell me why the system graphic of my detector show always a offset of + 50/60mV from zero? Can I adjust this anywhere? In the web interface, a can`t find any adjustment for this! It`s seem any wrong value in the ADC. 

• Sampling per InputResolution: 12bits, Period: 666ns = 500.0kSPS, Time: 2000ns
  
  
• ADC1
  
  • Input1 Amp-Channel 3 , Offset 26mV, no Trigger
    
  • Input2 Amp-Channel 4 , Offset 30mV, Trigger -90mV/90mV
    
• ADC2
  • Input1 Amp-Channel 2 , Offset 30mV, Trigger -95mV/95mV
    
  • Input2 Amp-Channel 3 , Offset 25mV, no Trigger
    
• ADC3
  • Input1 Amp-Channel 1 , Offset 39mV, Trigger -95mV/95mV
    
  • Input2 Amp-Channel 2 , Offset -151mV, no Trigger
    
    
    
• Thanks for your help!
  

Carlos Mourato

ST ID 1846

[kevinmcc]

That is normal.

There is a slight DC component that causes the offset.

Not adjustment is needed, and why there is no option.

[radiofarol]

Tanks a lot lot Kevin for your reply. I understanding that is a sliht DC component. I was a bit worried that this offset would change the results of the system, but if Kevin says it's normal, I'll be calmer. Thanks again!
Best 73 Carlos CT4RK

STID 1846

[DanielVe]

Hello,

When I started my station I noticed the same issue.
Finally I cleaned all PCB with Kontakt WL product and all DC components have disappeared.

Best regards

Daniel / ON4LDZ

[allsorts]

Oooo, that's interesting. Now what is "Kontakt WL"? A residue free, volatile, cleaner. Finds the safety data sheet, mostly isopropanol (propan-2-ol, isopropyl alcohol) with a dash of light petroleum (Naptha, lighter fluid). Have both of those lying about... Did you just clean a few selected areas or give the whole board, both sides, a good squirting with Kontackt WL?