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To remove cabling errors from time interval
measurements
When measuring time intervals in the nanosecond range, small differences in
cable length can totally obscure the measurement. The following exercise
shows how to remove errors that different cable lengths or characteristics
introduce to your measurement. The Skew control makes it possible to
remove this offset error from your measurement.
This process is also referred to as deskewing.
Select Time Reference to Center, with the Graticule turned on.
1
Connect the channels to be nulled to a common test point and obtain
2
a stable display. A fast edge is a good choice.
Press
3
Print/Utility
you access to the calibration and skew adjustments.
Select
Skew 1 > 2
to adjust channel 2 with respect to channel 1. Rotate
4
the knob to bring the channels into time alignment. This nullifies the
cable delay.
Select
to adjust the External Trigger with respect to
5
Skew 1 > E
Channel 1. Rotate the knob to bring these channels into time
alignment..
Note: This adjustment is not affected by pressing Autoscale. Only the
default setup will return the skew values to zero seconds.
To remove cabling errors from time interval measurements
, then select the
Self Cal
Operating Your Oscilloscope
menu. This gives
2-27
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