Agilent Technologies ESG Betriebsanweisung Seite 150

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Seitenansicht 149
134 Chapter 3
Basic Digital Operation
Differential Encoding
modulation. Refer to Figure 3-32 on page 134.
Figure 3-32
Editing the Differential State Map
1. Press
1 > Enter.
This encodes the first symbol by adding a symbol table offset of 1. The symbol rotates
forward through the state map by 1 value when a data value of 0 is modulated.
2. Press
+/- > 1 > Enter.
This encodes the second symbol by adding a symbol table offset of
1. The symbol rotates
backward through the state map by 1 value when a data value of 1 is modulated.
NOTE At this point, the modulation has one bit per symbol. For the first two data
values (00000000 and 00000001) only the last bits (the 0 and the 1,
respectively) are significant.
3. Press
2 > Enter.
This encodes the third symbol by adding a symbol table offset of 2. The symbol rotates
forward through the state map by 2 values when a data value of 10 is modulated.
4. Press
0 > Enter.
This encodes the fourth symbol by adding a symbol table offset of 0. The symbol does not
rotate through the state map when a data value of 11 is modulated.
Data
Symbol Table Offset Values Entry Area
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