Advanced Hardware Control; Overview - HP 70427A User Manual

8

Overview

NOTE

Advanced Hardware Control

The Advanced Hardware control function allows user control of latches,
relays and multiplexers that are normally controlled by the HP 7042XA's
firmware. While the hardware control feature is not typically used in normal
instrument operation, it can be a beneficial troubleshooting tool.
To assure proper operation of the HP 7042XA after using the Advanced
Hardware feature, the module should be reset by pressing
Blocks
Related groups of latches are known as a blocks. Block names correspond to
their functions and are indicated by the heading of the tables at the end of
this chapter. They are also labeled in the lower right corner of the block
diagrams at the end of chapter 13.
Latches
Related groups of bits are know as latches. Theses latches may or may not
directly correspond to physical latches controlling the hardware. Latch
numbers are shown in the tables at the end of this chapter and on the block
diagrams at the end of chapter 13. For more specific circuit details refer to
the Component Level Information Packet (CLIP set) 70427-90003.
Bits
Bits are the information that control the physical hardware. Bit numbers,
their associated weights, mnemonics, and descriptions are shown in the
tables at the end of this chapter. Similar information may be found on the
block diagrams at the end of chapter 13. For more specific circuit details
refer to the Component Level Information Packet (CLIP set) 70427-90003.
Relays
Relays are microwave switches used to route signals in the RF and IF stages
in the instrument. Relay numbers, mnemonics, and descriptions are shown in
a table at the end of the chapter. Additional information can be found on the
simplified block diagrams in chapter 13.
Multiplexers
Multiplexers connect various monitor points in the instrument to it's internal
voltmeter.
HP 70427A/HP 70428A User's Guide 8-1
.
INSTR PRESET