Probe Cal
TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
3–85
Figure 3–44: Probe Cal Menu and Gain Compensation Display
13. Press SHIFT UTILITY
➞ System (main) ➞ Diag/Err (pop-up) ➞ Error
Log
(main). If there are too many error messages to be seen on screen, rotate
the general purpose knob clockwise to scroll to the last message.
14. Note the compensation error amount. Skip to step 19.
15. Disconnect the probe from any signal you may have connected it to. Leave
the probe installed on its channel.
16. Press OK Compensate Offset
(side).
17. Wait for offset compensation to complete (one to three minutes).
If offset compensation does not complete successfully, you may get the
message “Compensation Error.” This error implies that the probe offset scale
(10% error) and/or offset (50 mV) is too great to be compensated. You can
substitute another probe and continue. Have your probe checked by service
personnel. You can also check the error log by doing steps 13 through 14.
18. After the clock icon is removed, verify the word Initialized changed to Pass
under Cal Probe in the main menu. (See Figure 3–44.)
19. If desired, repeat this procedure beginning at step 1 to compensate for other
probe/channel combinations.
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