8662A Option HI
1
08662-92019
Page 8 of 20
SECTION VIII. SERVICE
On page 8-204, in Table 8-203, Status Code Descriptions, change the description under
Status Code 01 to read as follows:
No signal level or no reference oscillator. Special Function 50 should be enabled for
internal reference oscillator.
On page 8-205, in Table 8-204, Special Function Status Codes, change the table as
follows:
51
External 10 MHz reference enabled
On page
8-205
(Service Sheet A), in Figure 8-201, Overall Block Diagram, in Diagram C,
REFERENCE SECTION: delete the EXT 5 MHz, EXT 10 MHz, and INT 10 MHz control
function; delete the 5 MHz portion of the EXT INPUT; and add a note reading "INT 10 MHz =
Special Function 50; EXT 10 MHz = Special Function 51.
On page 8-207/8-208 (Service Sheet B), replace part of Figure 8-202, Digital Control
Unit (DCU) Block Diagram, with the partial figure on page 11 of this insert.
On page 8-214 (Service Sheet C), under PRINCIPLES OF OPERATION, delete the
characters "5 MHz or" from the second paragraph.
On page 8-215 (Service Sheet C), replace part of figure 8-206, Reference Section Block
Diagram, with the partial figure on page 12 of this insert.
On page 8-331 (Service Sheet 15), replace part of figure 8-345, P/O A2A3
Level/Modulation Schematic, with the partial schematic on page 13 of this insert.
On page 8-401 (Service Sheet 18), under PRINCIPLES OF OPERATION, replace the
"General" and "Doubler Circuit" paragraphs with the paragraphs below, and then add the
"Description of Option HI
1
Modification" at the end of the page:
GENERAL
The Reference Buffer amplifies and distributes the reference source signal to the rest of
the instrument. The reference source can be the internal 10 MHz Reference Oscillator (A8A3) or
an external frequency standard of 10 MHz. The internal reference oscillator is a high stability,
temperature controlled, 10 MHz quartz oscillator.
DOUBLER CIRCUIT
The Doubler Circuit has been deleted in Option HI
1.
The 10 MHz bandpass amplifier is
still present.
Copyright 1986 - HEWLETT-PACKARD COMPANY - Spokane Division
24001 E. Mission Avenue, Liberty Lake, WA 99019-9599 U.S.A.
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