Tektronix Camcorder 1780-R Uživatelský manuál stáhnout pdf (Strana 144)

Measurements

4–32

1780R-Series Operator’s Manual

Using R–Y Sweep Mode

1. Set the burst to 180_ on the vector graticule. The R–Y compo-

nent of the input signal is viewed on the waveform CRT.

2. Set the front-panel VECT / SCH INPUT selection to SCH, and

the SCH Phase component is added to the R–Y display. The SCH

Phase display is proportional to the amplitude of the R–Y display,

and has a rise time of approximately 70 horizontal lines.

3. With a Field rate sweep selected, the location and relative

magnitude of the field rate SCH Phase errors are viewed. If no

SCH Phase errors are present, the display will be flat for NTSC.

For PAL, the display consists of a perfect 25 Hz sine wave, with

SCH Phase errors seen as deviations from the sine wave.

Measurements

4–32

1780R-Series Operator’s Manual

Using R–Y Sweep Mode

1. Set the burst to 180_ on the vector graticule. The R–Y compo-

nent of the input signal is viewed on the waveform CRT.

2. Set the front-panel VECT / SCH INPUT selection to SCH, and

the SCH Phase component is added to the R–Y display. The SCH

Phase display is proportional to the amplitude of the R–Y display,

and has a rise time of approximately 70 horizontal lines.

3. With a Field rate sweep selected, the location and relative

magnitude of the field rate SCH Phase errors are viewed. If no

SCH Phase errors are present, the display will be flat for NTSC.

For PAL, the display consists of a perfect 25 Hz sine wave, with

SCH Phase errors seen as deviations from the sine wave.

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