Tektronix 1740A/1750A User Manual

Page 87

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--Factor, while
the dashed line inner box equals a 2% K--Factor. For signals
with a bar half-amplitude duration that exceeds 18 s (8 s
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

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.