Agilent Technologies 90B manual Backup Protection for Open Programming Source

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It appears at first glance that the circuit of Figure 56B also has one drawback -- namely, the output voltage must always be switched in ascending or descending sequence. As Figure 56C shows, however, the same voltage divider can have its tap points returned to the switch contacts in any sequence, permitting output voltage values to be programmed in any desired order without overshoot or undershoot.

Figure 56. Remote Programming Switching Circuits

Backup Protection for Open Programming Source

In some applications it is possible for the programming switching circuit to be opened accidentally, thus

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