Tektronix TG700, Руководство пользователя

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HD3G7 HD 3 Gb/s SDI Video Generator
Table 3-31: Zone plate pattern control parameters (cont.)
Zone plate
signal
Pattern control parameter Parameter de fi nition
H Sweep H Sweep Frequency (maximum MHz, or
multiple) For horizontal sweep frequencies up to half of the video
standard’s sampling frequency, f
s
, the displayed value is the
maximum (or swept to) frequency of the sine wave. For
numbers greater than f
s
/2, dividing the displayed value by
the sampling frequency will give the number of complete
DC–(f
s
/2)–DC cycles per line. For example, in a standard
with sampling frequency of 74.25 MHz, a horizontal sweep
frequency of 148.5 MHz will result in approximately two
complete frequency sweeps across the picture.
V Sine Vertical Frequency (c/aph) The vertical frequency is actually the K
Y
coef fi cient. The
maximum frequency (c/aph) corresponds to the number of
active video lines in a
fi eld of the active video standard. For
example, when an 1125-line system, which has 1080 active
lines, is output, K
Y
can be any value between -540 and 540.
V Sweep V Sweep Frequency (maximum c/aph, or
multiple) The vertical sweep frequency is actually the K
Y
2
coef fi cient.
For numbers greater than maximum, dividing the displayed
value by that maximum will give twice the number
of complete DC-max-DC sweeps per
fi eld (sweeps =
(K
Y
2
/K
Y
)/2). For example, in a standard with 1080 lines per
fi eld, a vertical sweep frequency of 2160 c/aph
2
would result
in one complete frequency sweep down the picture.
Zone Plate Dependent Parameters
Below the pattern control parameter in each of the parameter menus are the
dependent parameters. The dependent parameters are the same for all the zone
plate patterns. Use the up (
▲ ) or down ( ▼ ) arrow button to scroll through the
parameter menu. If desired, use the left ( ◄ ) or right ( ► ) arrow button to change
the parameter.
NOTE.
Press the left ( ◄ ) and right ( ► ) arrow buttons at the same time to reset
any parameter to its default value.
If you adjust any one of the dependent parameters individually, the pattern control
parameter will become invalid, and you will see this message:
3–154 TG700 TV Signal Generator Platform User Manual