I have a 2465B that passes all calibration routines except parametric measurements CAL 09 steps 2 and 3 which always indicate "LIMIT". All of the rest of the CAL 09 steps pass. CAL routines 01, 02, 03 have been been repeated a couple of times with no problems. The scope functions fine and seems to perform parametric measurements correctly.
Has anyone seen this problem before and have a fix? Any thoughts would be appreciated.
Regards, George Kerber
download the servicemanual of the 2465B from
and follow the cal. procedure. This helped with my tek2465B
hth, Andreas
Andreas, That is exactly what I did. The entire cal procedure has been perfomed a couple of times. Still get "LIMIT" on CAL 09 steps 2 & 3. Everything else passes and the scope appears to function normally, except at startup it fails test 04 code 02 which means one or more cal coefficients is out of limits. I assume this is from CAL 09 steps 2 & 3. George
..snippety..
George, okay, when you can't complete by simply caloibrating: this says that your scope can't be cal'd any more due to a hardware problem on the board (most often input amp chips partly defective/out of specs).
change these chips. But be warned: Spares are ahrd to get.
hth, Andreas
snipped-for-privacy@bigfoot.com (TekMan) wrote in news: snipped-for-privacy@posting.google.com:
Isn't there something in the service manual that relates the cal step to a particular circuit area? ISTR that there was.
-- Jim Yanik jyanik-at-kua.net
Jim, I cannot find any reference in the manual (and I have several generations) that correlates cal step limit errors to specific circuit malfuction or point of measurement that is out of spec. The only clues for CAL 09 from the manual are that limit errors "are generally due to A or B sweeps, A or B gates, or the measurements PAL" - this doen't help much since all of the that seems to be working fine and only steps 2 & 3 have limit errors. Regards, George Kerber
"George Kerber" wrote in news:OyUmd.3709$ snipped-for-privacy@newsread2.news.atl.earthlink.net:
You may have a bad sweep hybrid;the timing resistors and caps are on the hybrid ICs. You could try swapping A and B sweep hybrids and recal.
IIRC,"measurements PAL" is a programmed array logic IC on one of the options. (although it's been a long time.)
Do you have options installed,and what are they?
-- Jim Yanik jyanik-at-kua.net
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