10-30 Chapter 10
Service Key Menus and Error Messages
Service Key Menus
Node 14 Vbb Ref (ECL reference voltage level)
Perform step A11 and then press
.
The trace should be a flat line across the entire operation frequency range within 0.3 V
(one division) of the reference value. Vbb Ref is used to compensate for ECL voltage drift.
Figure 10-9 Analog Bus Node 14
14 x1 Scale Ref 0.3 x1
−1.2
x1
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