Tek 2465B calibration issue

[George Kerber]

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
www.glkinst.com

 

[TekMan]

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
www.glkinst.com

download the servicemanual of the 2465B from

www.teknetelectronics.com

and follow the cal. procedure. This helped with my tek2465B


hth,
Andreas

 

[George Kerber]

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

 

[TekMan]

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

 

[Jim Yanik]

[email protected] (TekMan) wrote in

..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

Isn't there something in the service manual that relates the cal step to a
particular circuit area? ISTR that there was.