Principles Of Operation; Introduction; I/O Interface Signals - Agilent Technologies 6631B Service Manual

Principles of Operation

Introduction

This section describes the different functional circuits used in the dc power supply models covered in this
manual. First, the I/O external signals that connect to the Agilent power supply are described. Next, the
overall block diagrams for the dc power supply are described in detail.
The simplified block diagrams found in Chapter 6 show the major circuits of the dc power supply as well
as the signals between circuits. They also show the reference designations of some of the components in the
functional circuit.

I/O Interface Signals

Table 4-1 describes the interface signals between the power supply and the end user (or other external
circuits and devices).
Connector Signal
Front panel outputs +OUT
-OUT
Rear panel +OUT
output/sense screw -OUT
terminals + sense
- sense
common
INH/FLT connector
pin 1
pin 2
pin 3
pin 4
RS-232 connector XON-XOFF
RTS-CTS
DTR-DSR
NONE
GPIB connector GPIB /IEEE 488
Ac input connector ac mains
Table 4-1. Power Supply Interface signals
Description
Positive DC output voltage
Negative DC voltage (or return)
Positive DC output voltage
Negative DC voltage (or return)
+OUT sensing terminal
-OUT sensing terminal
connected to ground conductor
FLT/INH mode
FLT output
FLT Common
INH Input
INH Common
1
as-shipped configuration
uses ASCII control codes DC# and DC1
uses Request-To-Send and Clear-To-Send lines
uses Data-Terminal-Ready and Data-Set-Ready lines
there is no flow control
Provides the interface to an external GPIB controller
Can be 100 Vac, 120 Vac, 220 Vac or 240 Vac Input
1
Digital I/O mode
OUT 0
OUT 1
IN 2/OUT 2
Common
4
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