Products > Test Equipment
Tektronix 2445B calibration
flashthunder:
Thanks Calibrationfixture...this scope sat unused for several years. Except for the calibration errors on boot-up it's a very functional scope, having been used very little over its lifetime. However, while it was in storage the Dallas chip battery died so any cal data has been lost. I don't believe it to be a hardware issue as everything functions fine, my only issue it the firmware related error message when booting up. I was thinking that using another scopes data was a viable solution and you are confirming that. I have tried loading another scopes file (thanks Miti) but no success yet.
flashthunder:
Success! So, this is what I did to clear the Test 04 error 02 message on bootup. After loading the file provided by Miti my 2245B continued to bootup with Test 04 error 02. I performed the DAC adjustment and completed Cal 08. Then (and due to not having the proper calibration equipment) I decided to just run through the calibrations without making any changes. I started with Cal 01 and after going through each step I hit the Upper Trigger button to store changes, powered the scope down, moved the Cal/No Cal jumper to No Cal...then powered back up and the scope booted to normal mode with no errors and no "?" marks! Yay! I did not go through the remaining Cals as I did with Cal 01. I do know that the scope is not properly calibrated however for my purposes I'm satisfied that coping another "like" scopes calibration data works (as verified by Calibrationfixture). Thanks for everyone's help!
Miti:
--- Quote from: flashthunder on March 31, 2024, 03:30:51 pm ---Success! So, this is what I did to clear the Test 04 error 02 message on bootup. After loading the file provided by Miti my 2245B continued to bootup with Test 04 error 02. I performed the DAC adjustment and completed Cal 08. Then (and due to not having the proper calibration equipment) I decided to just run through the calibrations without making any changes. I started with Cal 01 and after going through each step I hit the Upper Trigger button to store changes, powered the scope down, moved the Cal/No Cal jumper to No Cal...then powered back up and the scope booted to normal mode with no errors and no "?" marks! Yay! I did not go through the remaining Cals as I did with Cal 01. I do know that the scope is not properly calibrated however for my purposes I'm satisfied that coping another "like" scopes calibration data works (as verified by Calibrationfixture). Thanks for everyone's help!
--- End quote ---
I don't understand why my file would give you errors, it was read from a working scope with valid calibration. I've validated that file in multiple ways at the time. New Dallas chips, FRAM, and it was always ok. Unless you have a different SW version and the memory map is different, I'm puzzled.
But anyways, congrats!
Cheers,
Miti
calibrationfixture:
Hi flashthunder,
Also my congratulations. A few years ago I also had to service a 2445B. At Start-Up it has a Test 04 Fail 10 and no Trace on CH2. After some repositioning of the traces (knob-fiddling), Attenuator DC-Cal and some scrolling through the Diagnostics Menu it was gone. Repair successful :)
Calibrationfixture
flashthunder:
Miti, your file did indeed work...it is the file that I am using. I was attempting to point out that I needed to complete a Cal routine before the calibration error cleared. Once I completed Cal 01 steps, and after saving Cal 01 everything worked. I don't understand how the memory section works but it seems to me that once the Cal 01 routine was written and saved then a calibration starting memory location was created. Perhaps that is why the manual states that the cal routines must be completed in sequence (cal 01 followed by cal 02 ect). It worked for me and hopefully this will help others clear those annoying question marks from their screens. Thanks,
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