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GENERAL INFORMATION
1-1
INTRODUCTION
1-2
This Operating and Service manual contains
information required to install, operate, test, adjust and
service the Hewlett-Packard Model 8081 A 300 MHz
Rate Generator module.
Figure 1-1 shows the module and accessories supplied.
This section covers instrument identification, descrip-
tion, accessories, specifications, and other basic informa-
tion.
1-3
A microfiche version of this manual is avai-
lable on 4 x 6 inch microfilm transparencies (order num-
ber on title page). Each microfiche contains up to 60
photo-duplicates of the manual pages. The microfiche
package also includes the latest Manual Changes supple-
ment as well as all pertinent Service Notes.
1-4
SPECIFICATIONS
1-5
I nstrument specifications are listed in
table 1-2. These specifications are the performance
standard or limits against which the instrument is tested.
is a significant change to the instrument. The last five
digits are assigned to instruments sequentially. The con-
tents of this manual apply directly to the instrument
serial number quoted on the title page. For instruments
with lower serial numbers, refer to the backdating infor-
mation in Section 8 of this module manual. For instru-
ments with higher serial numbers, refer to the Manual
Change sheets at the end of this module manual. In addi-
tion to change information, the Manual Change sheets
may contain information for correcting errors in the
manual. To keep this manual as up-to-date and accurate
as possible, Hewlett-Packard recommends that you
periodically request the latest Manual Change supple-
ment. The supplement for this manual is identified with
this manual's print date and part number, both of which
appear on this module manual's title page. Complimen-
tary copies of the supplement are available from
Hewlett-Packard.
HEWLETT - PACKARD
GmbH
[1536G00062 ]
BOBLINGEN ..
Figure 1-1. Serial Number Plate
1-6
SAFETY CONSIDERATIONS
1-11
DESCRIPTION
1-7
The Model 8081 A is a Safety Class 1 instru-
ment (it has an exposed metal chassis that is connected
to earth via the 8080A system mainframe). This instru-
ment has been designed according to international safety
standards and has been supplied in a safe condition.
1-8
This operating and service manual contains
information, cautions and warnings which must be fol-
lowed by the user to ensure safe operation and to main-
tain the instrument in a safe condition.
1-9
INSTRUMENTS COVERED BY MANUAL
1-10
Attached to the inside of the instrument side
frame is a serial number plate (figu re 1-1). The first
four digits of the serial nu mber
0
nly change when there
1-12
The Model 8081A is a 0-300 MHz Rate
Generator module designed to provide a clock source for
another 8080 system module. The 8081 A has four
operating modes:
Normal
Trigger
External Gate
Internal Gate
In Normal mode, the rate generator is free-running at the
repetition rate selected by the rate controls. In Trigger
mode, the rate generator is bypassed and the pu Ise
output is merely a shaped version of a pulse input from
either an external sou rce or a manual pushbutton. In
External Gate Mode, the rate generator output is gated
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