Theory of Operation 4
Keysight E4416A/E4417A Power Meters Service Guide 93
A5 Daughter Assembly
The A5 daughter assembly is loaded vertically into the A2 processor assembly.
There are 3 main connectors on the daughter card which provide the interconnect
between the A2 processor assembly and the A6 measurement assembly.
Additionally there are two SMB connectors for the external trigger signals that are
routed using cable assemblies to the rear panel.
In addition the A5 daughter card provides support functions for the measurement
assemblies. These functions take power and signals from the A2 processor
assembly and generate the power and signals required by the A6 measurement
assembly. The A5 daughter assembly also provides common trigger functions that
are routed to both the A6 measurement assemblies.
The functions provided are:
– Clock buffering and distribution.
– External trigger output buffer.
– External trigger input comparator and buffer.
– +2.5 V precision reference.
– +11 V regulator.
– +3.3 V regulator.
– +2.5 V regulator.
– ±5 V regulators.
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