Tektronix 1740A/1750A Make sure that the center of the bar is at 100 IRE (1 Volt

VARIABLE GAIN

Basic Measurements

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 normalizing 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—GAINmenu, 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 (useto 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.

4-6 1740A/1750A Series Waveform/Vector Monitor User Manual