Tektronix 1740A/1750A Uživatelský manuál stáhnout pdf (Strana 83)

Basic Measurements

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

4-2

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 compo-

nent measurements.

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

There are ± 2IRE 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.

KFactor

Setup

Audio

100% White

Level

75% White

Level

Baseline

Sync Tip

Figure 4-1. NTSC waveform/vector graticule.

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 142 143

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Tektronix 1740A/1750A Uživatelský manuál Strana 83