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Probe Cal
TDS 620A, 640A & 644A User Manual
3Ć95
6. Press VERTICAL MENU ➞ Cal Probe (main).
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 3Ć50). 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:
H The clock icon will disappear.
H If offset compensation is required for the probe installed, the Probe
Offset Compensation message will replace the Probe Gain CompenĆ
sation message.
H 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, etc., and repeat step 9).
H If gain compensation did not complete successfully, you may get the
message Compensation Error." This error implies that the probe
gain (2% error) and/or offset (50 mV) is too great to be compenĆ
sated. You can substitute another probe and continue. Have your
probe checked by service personnel.