Electronics > Beginners

I can’t compensate my probe

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SteveRosenlund:
Hi everyone,

I’m on my phone with Tapatalk so I’m having trouble uploading photos. I’ll provide a link to Imgur where the image is located.

https://imgur.com/qmtz4qQ?

My issue is that I cannot compensate my p6137 probes to my Tek 2465B scope. I’m thinking the probe capacitance is out of range of the scope input capacitance. The image shows the square wave at the squarest I can make it.
Do you guys know what the capacitance range for the probes for this scope? 

If I’m out of range that’s fine, but I’ve heard so many of you say how theee are the probes used on this scope.
I also have some p6156 50 ohm probes which work great. Basically I can compensate all my basic probes to this scope just not my p6137 probes.

chris_leyson:
The P6137 is designed for the 2400 series and the P6137 manual states 12pF to 18pF compensation range. Input capacitance for the 2465B is 15pF +/- 2pF so the probe compensation range is spot on for the scope. You may have to take the cover off the "compensation block" at the scope and adjust the LF compensation trimmer. The TEK documentation, link below, leaves a lot to be desired though.
https://www.tek.com/manual/p6137-10x-passive-probe-2400-series-oscilloscopes

SteveRosenlund:
Hey thanks for the reply. My p6137 probe states that it has 10.8pf of capacitance. I did take the cover off and adjust the other trim pots in the probe box per the manual to no avail.

Jeroen3:
I have noticed that if you use a probe beyond it's voltage rating for even the slightest moment, the compensation circuit will be damaged permanently. Maybe this is what happened?

SteveRosenlund:
Hmm if I’m reading the manual correctly, anything under 50vdc is safe for these probes at frequencies above 1MHz. I can safely say I’ve never probed anything above 12vdc with this probe. Do you think I have a bad compensation box?  Should I replace the probe or attempt to repair it?

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