Products > Test Equipment
Just got a Tek 2465A, couple questions (how I screwed the calibration data)!!
tonedeak99:
Archer,
What a mess was created by replacing the battery. I am thinking of doing just that to my 2465A CT but this is exactly my worry with doing it. My scope works well, only has 5000 hours, and the battery reads 4v. Could the points you chose to connect the backup battery have been the problem?
I'm thinking of following this process and points:
https://jestineyong.com/tektronix-2465a-dv-oscilloscope-memory-backup-battery-replacement/
I already took an EXER 02 video and I'm seriously considering backing up the SRAM with an GPIB interface adapter. I hope that GPIB can read and write the entire SRAM and not just the calibration area just in case it gets corrupted like it did for you. Great job getting the whole mess fixed!
alpher:
Worry not! :) I ended up calibrating the scope anyway, not to dificult in the end. Since your battery reads 4V i wouldn't worry at all.
Leave it alone.
:)
tonedeak99:
Like you, I'm just a hobbyist and don't have any of the fancy calibration equipment and couldn't afford it even if I wanted it. What equipment did you use to calibrate?
tggzzz:
--- Quote from: tonedeak99 on March 22, 2024, 12:36:42 pm ---Like you, I'm just a hobbyist and don't have any of the fancy calibration equipment and couldn't afford it even if I wanted it. What equipment did you use to calibrate?
--- End quote ---
Vertical deflection is easy: just use a power supply and voltmeter.
Horizontal deflection is easy: just use any modern signal generator (or an old one with a frequency counter).
The trickier and more important adjustment is the step response. For that you need something with a risetime less than the scope's risetime with no overshoot and with a flat top. Hence the long running "show us your square wave" thread :) No, a simple pulse from an avalanche generator isn't sufficient, because the visible trace is the convolution of the (undefined) input pulse and the scope's response.
alpher:
--- Quote from: tggzzz on March 22, 2024, 01:09:10 pm ---
--- Quote from: tonedeak99 on March 22, 2024, 12:36:42 pm ---Like you, I'm just a hobbyist and don't have any of the fancy calibration equipment and couldn't afford it even if I wanted it. What equipment did you use to calibrate?
--- End quote ---
Vertical deflection is easy: just use a power supply and voltmeter.
Horizontal deflection is easy: just use any modern signal generator (or an old one with a frequency counter).
The trickier and more important adjustment is the step response. For that you need something with a risetime less than the scope's risetime with no overshoot and with a flat top. Hence the long running "show us your square wave" thread :) No, a simple pulse from an avalanche generator isn't sufficient, because the visible trace is the convolution of the (undefined) input pulse and the scope's response.
--- End quote ---
To restore lost calibration constants you don't need any pulse generator.
I used the Tek prescribed stuff, all you really need is TG501 and PG506.
If you interested I'll sell it cheap.
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