Agilent Technologies 54657A Spezifikationen Seite 57

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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.
1
Select Time Reference to Center, with the Graticule turned on.
2 Connect the channels to be nulled to a common test point and obtain
a stable display. A fast edge is a good choice.
3 Press Print/Utility , then select the Service Menu softkey, then
the
Self Cal Menu softkey. This gives you access to the calibration
and skew adjustments.
4 Select Skew 1 > 2 to adjust channel 2 with respect to channel 1. Rotate
the knob to bring the channels into time alignment. This nullifies the
cable delay.
This adjustment is not affected by pressing Autoscale. If the default setup is
selected or default calibration factors are loaded, the skew value will return to
zero seconds.
Operating Your Oscilloscope
To remove cabling errors from time interval measurements
2–27
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