Theory of Operation 4
E4416A/E4417A Power Meters Service Guide 81
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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