Fluke DDS Function Generator 271 Uživatelský manuál stáhnout pdf (Strana 30)

271

Getting Started Manual

set the levels to produce five monochrome stripes from left

to right: grey, white, grey, black and grey again.

Our line signal thus looks like the drawing below:

shx0019f.gif

Figure 2. 625-line PAL TV Signal

In the instrument the number of horizontal points which

make up the complete waveform is 1024, so the horizontal

steps must be scaled to the range 0-1023.

Similarly, the full-scale signal amplitude is defined by

values up to +511, so the vertical amplitudes must be

scaled to to the range 0-511.

We can produce a table of all nine steps of the waveform

(numbered 0 to 8), as follows:

1 2 ... 25 26 27 28 29 30 31 32 33 34

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Fluke DDS Function Generator 271 Uživatelský manuál Strana 30