Probe Cal
3–84
TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
3. Press SHIFT UTILITY
➞ System (main) ➞ Cal (pop-up).
4. Look at the status label under Signal Path in the main menu. If the status
does not read Pass, perform a signal path compensation (Signal Path
Compensation, page 3–115), and then continue with this procedure.
5. Press the front-panel button corresponding to the input channel on which you
installed the probe.
6. Press VERTICAL MENU
➞ Cal Probe (main).
STOP.
Your oscilloscope will detect the type of probe you have installed and display
screen messages and menu choices for compensation of probe gain, offset, or both (see
Figure 3–44). The following steps will have you run probe gain, offset, or both
depending on the probe the oscilloscope detects.
7. If the message on screen is Probe Offset Compensation rather than Probe
Gain Compensation, skip to step 15.
8. Connect the probe tip to PROBE COMPENSATION SIGNAL; connect
the probe ground lead to PROBE COMPENSATION GND.
9. Press OK Compensate Gain
(side).
10. Wait for gain compensation to complete (one to three minutes).
When gain compensation completes, the following actions occur:
If offset compensation is required for the probe installed, the Probe
Offset Compensation message will replace the Probe Gain Compensa-
tion message.
If gain compensation did not complete successfully, you may get a
“Probe is not connected” message (examine the probe connections to the
digitizing oscilloscope, be sure the probe tip is properly installed in its
retractor, and repeat step 9).
If gain compensation did not complete successfully, you may get the
message “Compensation Error.” This error implies that the probe gain or
offset is too great to be compensated. You can substitute another probe
and continue. Have your probe checked by service personnel.
11. If the Probe Offset Compensation message is displayed, continue with
step 15; otherwise, continue with step 12.
12. If the Compensation Error message is displayed, continue with step 13;
otherwise continue with step 18.
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