HP 83522A Service Notes page 181

Rf plug-.in including options 002 and 004
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Figure 8-25. Simplified ALC Block Diagram (CHANGE 8)
CHANGE 8
A17 MOD./MIX
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NOTE
DARKER LINES REPRESENT THE LEVELING LOOP.
LIGHTER LINES REPRESENT CIRCUITRY WHICH
CONTRIBUTES TO, BUT IS NOT CONTAINED
WITHIN, EITHER LOOP.
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