HP 75000 SERIES C User Manual

The VXlbus Interface
The Microprocessor
System
The Synthesizer
The interface allows the VXI mainframe controller to communicate
with the
HP E1440A. It accepts Standard Commands for
Programmable Instruments (SCPI) from the controller and
converts the commands (via a resident interpreter) into a form the
HP E1440A understands. The interface also passes information
obtained from the
HP E1440A back to the controller system.
Included in the interface, is the power supply
( a DC-DC Converter)
module which takes it's supply from the mainframe bus and converts
it into the supplies required by the
HP E1440A. In doing so it also
isolates the HP
E1440A from the mainframe bus, thus filtering out
external noise and possible voltage variations.
This part of the HP
E1440A includes the microprocessor, associated
ROM and RAM areas, decoders and peripheral devices. It maintains
overall control of the whole unit.
Wbvs
-
Interface
.( Conhoi
-
Sample 8 Hold
30 to 6OMHz
30 to 60MHz
sync Out l7L
. . . . . . . . . . . . . .
0-60MM
If-vcol
- If-re6
0 to 21MHz mto
' samde & boa Func. Generator
Figure 4-2. Synthesizer Block Diagram
The synthesizer produces basic reference frequencies for the external
outputs. To do this it uses
a crystal source reference frequency
(30 MHz) and applies mathematical, phase detection, averaging
techniques etc. to produce
an output from a voltage controlled
oscillator. Overall control of the synthesizer circuits is exercised by a
digital control unit, slaved to the
HP E1440A microprocessor.
4-2 Understanding the HP E1440A
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HP 75000 SERIES C Specifications

General

Brand	HP
Model	75000 SERIES C
Category	Inverter
Language	English