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Tek 2465B cal 01 problems!! help need!!


 

This is the fifth time, I do CAL 01, and is not good, slow by 4.4% in 5ns, fast by 3.8% in 500ms, second my TG501 5Mhz oven option..

All other time ranges are pretty well.
During cal 01 a limit was encountered in step 30,31,32.not enough sweep speed/Horzgain to fill 1 mark division as is prompted .
Step 33,34 pass well.

I wonder me if a bad timing cap could by the reason?.
Any help will be very appreciated.
Regards Gabriel.


 

The horizontal U700 shown a CTO in pin 7 cap made in PCB, I suppose for the fastest sweep,could for any reason this cap increase his value..dirt perhaps..?
Can I remove the heat-sink of U700 to see this cap?.
Since seems that 5ns range is not enough fast, what about to reduce the value in same 4,4% of R723 R724 ?.
I have no clue about why the 500mS is wrong!in what step is done his cal? any suggestion?.
I will appreciate any inputs.
Gabriel.

--- In TekScopes@..., "iglesia_cristiana_arpas_eternas" <iglesia_cristiana_arpas_eternas@...> wrote:

This is the fifth time, I do CAL 01, and is not good, slow by 4.4% in 5ns, fast by 3.8% in 500ms, second my TG501 5Mhz oven option..

All other time ranges are pretty well.
During cal 01 a limit was encountered in step 30,31,32.not enough sweep speed/Horzgain to fill 1 mark division as is prompted .
Step 33,34 pass well.

I wonder me if a bad timing cap could by the reason?.
Any help will be very appreciated.
Regards Gabriel.