Tektronix SPG8000 Technical Reference page 87

Table 17: Standard SDI test signal sets (cont.)
Signal set Signals in the signal set
LINEARITY 5 Step Staircase,
10 Step Staircase
Valid Ramp,
Y Valid Ramp,
B-Y Valid Ramp,
R-Y Valid Ramp
3 Channel Ramp
Limit Ramp
Shallow Ramp Matrix
Color Ramp Matrix
SPG8000 Technical Reference
SDI button menu (Option SDI only)
Description
Series of vertical bars of equal steps on all three channels. These
patterns are color-independent so they will appear differently in
YCbCr, RGB, or XYZ color spaces. Since the range of valid levels
is not evenly divisible by 5 or 10 steps, the first and last bars
slightly exceed the valid range, but are still well within legal limits.
For example, the valid range for 10-bit YCbCr formats is from
64–940 for the Y channel (876 steps) and from 64–960 for the
Cb/Cr channels (896 steps). Therefore, the level of the first bar is
62 and the level of the last bar is 942/962, which results in equal
step sizes across the pattern.
The Valid Ramp is a matrix of three different ramps, designed
to test the video component channels for YCbCr, and for gamut
range testing in all color spaces. These three ramps are also
available as individual patterns that span the picture width. First,
the Y Valid Ramp spans from black to white, across the valid
range of the luminance (Y) channel. Next, the B−Y Valid Ramp
spans from yellow to cyan, across the valid range of the Cb color
difference channel. Last, the R−Y Valid Ramp spans from cyan to
red, across the valid range of the Cr color difference channel.
Wide ramp from the lower valid value to the upper valid value for
all three channels. This pattern is color-independent, so it will
appear differently in YCbCr, RGB, or XYZ color spaces. On each
side of the ramp there are small plateaus at the blanking level
(black) and at the valid level.
Wide ramp that spans the legal limit range (4–1019 for 10-bit
formats and 16–4079 for 12-bit formats) for all three channels. On
each side of the ramp there are small plateaus at the blanking
level, the valid level, and the limit level.
Vertical matrix of shallow ramps that together span the range
between legal limits (4–1019 for 10-bit formats and 16–4079 for
12-bit formats). Each bit value is held for 16 pixels for 10-bit
formats and for 4 pixels for 12-bit formats. There is overlap
between the end of one ramp and the start of the next ramp.
Vertical matrix of ramps across the colors available in the valid
RGB gamut. Each set of ramps transitions between adjacent
hues: red–yellow–green–cyan–magenta–blue–red. From the top
of the pattern, the first three rows of ramps are at 25%, 50%, and
75% saturation. The fourth row of ramps includes fully saturated
colors at 100% value. The next three rows of ramps are at 75%,
50%, and 25% value. The bottom row of ramps is monochrome.
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