Basic Measurements

NTSC Vertical Scales

The NTSC graticule is shown in Figure 4-1. The left side of the graticule is scaled in IRE units and extends from -50 to +120 IRE in 10 IRE increments. A mV scale has been added to the right side of the NTSC graticule to facilitate component measurements.

Black level setup is denoted by a dashed line at 7.5 IRE.

There are ± 2 IRE and ± 4 IRE markings at the center of the -40 IRE line to assist in measuring sync amplitude. This scale is designed for use with two line or two field sweep rates.

The graticules are also marked for K-Factor tolerances and linear-distortion measurements. These measurements will be described later in this section.

K Factor

Audio

100% White

Level

75% White

Level

Baseline

Setup

Sync Tip

Figure 4-1. NTSC waveform/vector graticule.

4-2

1740A/1750A Series Waveform/Vector Monitor User Manual