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Old analog oscilloscope questions

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tedsorvino:
Thanks a lot Gyro. Your advice really really helps on what the next steps should be.
Thanks everybody for your kind effort and help.

Gyro:

--- Quote from: james_s on August 09, 2018, 03:45:22 pm ---That's true, however on quite a few scopes the terminal used to adjust the probe compensation is called "Calibrator" so I don't think the term is entirely inappropriate. If Tektronix thought it was reasonable to call it a calibrator that's good enough for me.

--- End quote ---

You're splitting hairs a bit too much there. Whatever you use as a source, the process is known as probe compensation and probe specs state a 'compensation range'. Many scopes call the terminal something like 'Probe Comp'.

The reason Tek (and a few others) call theirs a Calibrator is... (1) They normally implement it as a current loop for active current probe level calibration, and (2) It has specified accuracy for voltage and current. That's not general practice across all manufacturers.

Just because Tek implement it in a specific way doesn't justify an 'If it's good enough for Tek then its good enough for me' type response. More fundamental understanding is needed.


EDIT: ...and yes I am guilty too:


--- Quote from: Gyro on August 08, 2018, 05:55:43 pm ---The lack of a probe calibration output is certainly a bit of a problem for compensating your probes.

--- End quote ---
:palm:

tedsorvino:
Finally, I found and purchased the manual (if anyone cares or needs it I can send the pdf) and I also bought a decent old Farnell signal generator. So I opened the scope, calibrated it and tested it.  Now it's really functional.
Some things (pots and trimmers) would be better replaced in the future (for more precise measurements), but after working out some solutions (changing the vertical subdivision to "calibration friendlier" values) and cleaning the whole thing with certain contact cleaners and compressed air sprays, I managed to revive it and make it work properly.
And in order to answer the question regarding the binding post ... after finding, purchasing and reading the manual. ...According to the manufacturer: "This output provides a positive going sq. wave of approximately 20V amplitude from a source impedance of 15kOhm. Its freq. is dependent on the setting of time/div and is suitable for probe compensation.
Mine is missing the jumper to the source impedance.
But in my eyes it's quite risky (things may fall apart or stop working) and troublesome to remove three old boards from an old oscilloscope. One day it may happen if it really needs to.
Thanks a lot everybody.

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