HP 83487A, Руководство пользователя, Страница: 34 / 98

2-12
Channel Setup Menu
Calibrate
Calibrate
The Calibrate softkey allows you to null any skew between probes or cables,
remove the effects of offsets in the internal O/E converter, recalibrate the
responsivity of the O/E converter, and check the present calibration status of
the analyzer.
Key Path
Channel, Calibrate
Skew
The
Skew
function changes the horizontal position of a waveform on the dis-
play. The
Skew
function has a range of
≈
+100
µ
s. You can use skew to compen-
sate for differences in cable or probe lengths. It also allows you to place the
triggered 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.
Key Path Channel, Calibrate, Skew
To skew two channels
Turn both channels on and overlay the signals vertically.
Expand the time base so the rising edges are at about a 45 degree angle.
Adjust the skew on one of the channels so that the rising edges overlap at the 50 per-
cent points.