10x probe setup

[Bone]

I have tried to use 3 different 100 MHz 10x probes and 2 25 MHz 10x probes my dso112a. None of them can be tuned enough to compensate. Even using the built in square wave generator at 1KHz they are all under compensated. I have also tried 2 diffrent adapters that goes from bnc to mcx without any results. Any suggestions on what I need to do to remedy the problem?

Thanks,
Steve

[jye1]

Do you have the newer model "Coral" (DSO112A) or the older one?

[Bone]

Yes, it is the dso112a. I just bought it last week on Amazon.

[Bone]

Is there some way to adjust it on the dso112a?

[jye1]

Please see the attached photo. There are two cap trimmer can be adjusted for probe calibration. Adjust C64 for sensitivity between 5mV/div - 0.2V/div and C24 for 0.5V/div - 20V/div. Probe should be set to 1X when tuning the caps.

[mwm]

I'm trying to follow this advice, but I'm a bit stuck. Things look fine at 1X, but 10X is clearly under compensated. Does it need to be adjusted at 10X after adjusting for 1X, should I just adjust it at 10X, or am I missing something?

[jye1]

The compensation for 10X should be done by the trimmer at the probe handle or its BNC connector. The trimmers at scope should only take care of 1X compensation.