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Channel Skew Calibration
This calibration affects both optical and electrical measurements. The skew
calibration changes the horizontal position of a waveform on the display. The
skew calibration has a range of approximately 100 µs. You can use skew to
compensate for the differences in cable or probe lengths. It also allows you to
place the trigger edge at the center of the display when you are using a power
splitter connected between the channel and trigger inputs. Another use for
skew is when you are comparing two waveforms that have a timing difference.
If you are interested in comparing the shapes of two waveforms rather than
the actual timing difference, you can use skew to overlay one waveform on top
of the other waveform.
To skew two channels
1 Turn both channels on and overlay the signals vertically.
2 Expand the time base so that the rising edges are at about a 45° angle.
3 Press the plug-in module's front-panel channel SETUP key.
4 Press Calibrate and then Skew.
5 Adjust the skew on one of the channels so that the rising edges overlap at the
50% points.
Probe Calibration
Probe calibration applies to electrical measurements only. For active probes
such as the HP 54701A, which the instrument can identify through the probe
power connector, the instrument automatically adjusts the channel vertical
scale factors to the probe's nominal attenuation, even if a probe calibration is
not performed.
For passive probes or non-identified probes, the instrument adjusts the verti-
cal scale factors only if a probe calibration is performed. Probe calibration
allows the instrument to establish the gain and offset of specific probes that
are connected to a channel of the instrument, and then apply those factors to
the calibration of that channel.
The analyzer calibrates to the tip of the probe by setting the probe attenuation
to the actual attenuation ratio of the probe. The CAL signal is internally routed
to the probe tip for HP active probes.
Calibration Overview
User Calibrations—Optical and Electrical
3-15
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