Assembly-Level Service
Theory of Operation
2-11
Input/Output Block
The first sentence of the second paragraph is changed to:
The block also receives a front- panel Sync- i nput s ignal to s ynchronize
the 1 pps output with an external system or event.
Power Supply Block
The text is changed t o:
The power supply block provides the instrument with required
internal dc power from either ac power or an external dc power
source. It monitors the presence of these power sources, switching
from one to another as required.
Functional Block Descriptions
On page 3-7. the second bulleted item text under the Reference
Oscillator/RF-Chain Block is changed to:
A9 Frequency Multiplier/Telecommunication Sync Input/Outputs
Synthesizer
On page 3-7. the last bulleted item under the Power Supply Block is
deleted:
Figure 3-2. 5071 A Overall Block Diagram
The Rear-Panel Sync Input at the top of page 3-8 is deleted:
The A9 Frequency Multiplier Module block has the following name and
input output changes:
A9 Frequency Multiplier/Telecommunications Input Sync and Output
Synthesizer Module
An additional 8 kHz Sync Input is routed to A9 from the rear panel.
Four additional outputs exit A9 and are routed to the rear panel;
• 8 kHz Sync Out
• Framed Output
• Sync Out
• Sync Out TTL
Any TCO Opt ion:
Option 048:
Any TCO Opt ion:
Option 048:
Any TCO Opt ion:
Any TCO Opt ion: