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Basic Measurements
1740A/1750A Series Waveform/Vector Monitor User Manual
4-6
To measure the K-- Factor line-time distortion, measure the
largest deviation of the bar top (tilt or rounding) within the
structure. The solid outer box equals a 4% K --Fac tor, while
the dashed line inner box equals a 2% K--Factor. For signals
with a bar half-amplitude duration that exceeds 18 s(8s
PAL), measure the bar top in increments by positioning the
bar to the left or right of the leading or trailing edge. The
first and last 1 s of the bar should be disregarded.
Pulse-to-bar K--Factor measurements are made by normaliz-
ing bar amplitude (100 IRE or 1V) and adjusting the
HORIZ
POS
control to position the pulse on the line-time distortion
structure. Use the
VAR GAIN (see CONFIG—GAIN menu, page
3-24) to adjust signal amplitude.
Make sure that the center of the bar is at 100 IRE (1 Volt
PAL) when blanking level is at 0 IRE (use
VARIABLE GAIN to
adjust gain, if necessary). Use the
HORIZ POS control to
place the 2T pulse over the center of the boxed measurement
area and measure its amplitude. When the top of the pulse
falls within the dashed lines, the K-- Factor equals 2% or less.