Appendix D: Calibration Procedures
Driver start calibration
Driver start calibration
1) Start automatic driver calibration by selecting
Driver Start
from the
Calibration
menu.
Completion of the step may take some time.
Resistive load calibration
Resistive load calibration
1) Remove any attachments from the CT100 front cable connector.
2) Start resistive load calibration by selecting the
Resistive Load
menu item (Button 4) from the
Calibration
submenu.
Resistive load calibration will commence. In the resistive load calibration routine the CT100 may
display a message instructing the operator to attach a shorting cap or an open to the front of the
cable connector. The precise devices required will depend on what sort of cable connector your
CT100 has.
Vertical calibration
Vertical calibration
Vertical calibration should be performed immediately after resistive load calibration has
completed. An open attachment is required if the connector on the CT100 is a BNC.
1) If the CT100 has a BNC connector, attach the open.
2) Start vertical calibration by selecting
Vertical Calibration
(Button 23) from the
Calibration
submenu.
Vertical calibration will continue and complete.
Manually verify calibration values
Manually verify calibration values
After the automated calibrations have completed, it is a good idea to verify the adjusted values
and modify them if necessary.
Manually verify capacitive calibration
1) Attach the capacitive calibrator to the front panel cable connector.
2) Rotate the
HORIZONTAL POSITION
knob until one cursor is at the farthest left point on the
screen. Keep moving the cursor left until the cursor sits at the earliest possible position on
the trace.
3) Press the
CURSOR
button to switch to the second cursor.
4) Move the second cursor across the screen until the change in time between the two
cursors reads close to 50ns. At 50ns from the start of the trace, there is a clock pulse, or
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Mohr CT100 / CT100HF Operator's Manual
