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Assembly-Level Service
Theory of Operation
2-10
Theory of Operation
This section describes the additions, changes, and deletions to the
information that appears in chapter 3 of the 5071A Primary
Frequency Standard Assembly-Level Service manual.
Introduction
A1 Motherboard Circuit Description
The second sentence of the paragraph at the bottom of page 3-3 is
changed to:
It gives you information about how individual components on A1 and
component groups (including A11, A12, and T1) perform their
functions and provide dc power to the instrument.
Simplified Functional Description
Item 6 text is changed to:
Power distribution; A1, A11, A12, LF1, and T1.
Figure 3-1. 5071 A Simplified Block Diagram
The block diagram is changed in the following ways:
The rear-panel Sync Input entering the left side of the Input/Output
Block is absent.
The rear-panel 1 PPS outputs exiting the right side of the Input/
Output Block are absent.
A bi-directional line is added from the right side of the Reference
Oscillator/RF-Chain Block to the right border of the diagram with a
callout title “Telecommunications Input/Outputs”.
The block diagram is changed in the following way:
The B1 Standby Battery in the Power Supply Block is absent.
Reference Oscillator/RF-Chain Block
The second paragraph has an added second sentence:
Any telecommunications output option provides a Sync input and four
outputs that are fed into and derived from the Reference Oscillator/
RF Chain Block.
Option 048:
Option 048:
Any TCO Option:
Option 048:
Any TCO Option: