Tektronix SPG8000 Technical Reference page 131

SPG8000 Technical Reference
K parameter.
XY
Display name: KXY (V Ch. H Freq.)
Units: c/aph per active picture height (c/aph
The K (V Ch. H Freq.) parameter sets the change in horizontal frequency
XY
as a function of the vertical position in the video frame. To see the effects of
this parameter, set the waveform monitor to view one selected line only. Then,
with K set to approximately 25 (all other coefficients left at 0.0), look at line
XY
waveforms from top to bottom of the frame. The horizontal frequency increases
slightly on each succeeding line, reaching 25 c/aph on the last line of active video.
The result can be thought of as a vertically arranged "sweep" signal.
K parameter.
Y
Display name: KY (V Freq.)
Units: cycles per active picture height (c/aph)
The K (V Freq.) parameter sets the initial vertical frequency of the pattern (it is
Y
analogous to K rotated 90° clockwise). To see the effects of this parameter, set it
X
to a low number and adjust a waveform monitor to view one or two fields of the
instrument SDI output. The variation in the (dc) voltage level from line to line
will give the field waveform the appearance of a sampled sine wave, especially at
of around 5 to 10 c/aph (the sinusoid can become difficult to discern at higher
a K
Y
frequencies). Note that in the Y (vertical) parameters, the c/aph units translate
directly into visible cycles down the frame.
The Vertical Sine zone plate is a "K
Figure 41: A "K -only" zone plate
Y
SDI button menu (Option SDI only)
)
2
-only" zone plate. (See Figure 41.)
Y
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