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AWG2021 User Manual
3 Ć127
1. Select Shift Register Generator... from the side menu.
2. Select User defined Code Config... from the sub menu.
3. Define the codes as desired. For the basic operations used when defining
codes, see “User defined Code Config...” on Page 3 -110.
4. Select Go Back to return to the Shift Register Generator... menu.
5. Select Register Config... from the side menu.
6. Set the values for Register Length and Point/Step as well as the register
value and tap.
7. Press the CURSOR button to select Code menu item. A knob icon will
appear in the upper left side of the Code selection menu.
8. Turn the general purpose knob to select user defined.
9. Press O.K. in the sub-menu to confirm the settings. The Shift Register
Generator... menu will automatically reappear.
10. Using the general purpose knob, define the data line and area where the
pattern will be inserted.
11. Press Execute in the sub-menu. The result will be inserted between the
cursors on the data line selected in the previous step.
Creating the M Series PseudoĆRandom Signal. An M series pseudo-random signal
has a length of 2
n
-1 assuming the number of levels for the shift register is n. In
this example, we will create an M series pseudo-random signal of 2
15
-1 bits (15
levels) with 1 point for each step. This signal is included on the Sample
Waveform Library Disk that came with the AWG2021.
1. Select Setting from the bottom menu.
2. Select Waveform Points from the side menu. Then set the waveform point
size to 32,767 using the numeric keys. The waveform point size needed to
display all the bits of the pseudo-random signal is given by the following
formula:
(Value for Point/Step) × (2
n
-1)=1 × (2
15
-1)=32,767
3. Select Shift Register Generator... from the third page of the side menu
(More 3 of 3).
4. Press the CURSOR button on the front panel.
5. Using the general purpose knob, move the vertical bar cursors to designate
the area to which pseudo-random signals are inserted. In this example, we
will set the left cursor to point 0 and the right cursor to point 32,766.