|
2.1 Probe Compensation
In practice, adjustment of probe capacitance is very easy. All scopes provide a reference
output, labelled something like PROBE ADJ or CALIBRATE, that is typically a 1kHz square
wave at 5V peak-to-peak. Just clip the probe onto the reference output, set up the triggering,
and adjust the probe capacitance by turning the tiny screw in the probe head. When correctly
adjusted, the screen trace should show a crisp, “square” square wave, free of rounded-off
corners, overshoot or oscillations.
Do NOT attempt to adjust the probe compensation screw on the Lab scopes – it is fastened
with a thread locking compound. The Lab scopes have a feature that allows checking of probe
compensation. To use this feature, set the Probe entry in the VERTICAL menu to match the
probe, clip the probe onto the “PROBE COMP” output (see Figure 3), and press the “PROBE
CHECK” button. The message PASSED should be displayed on the screen.
|
|