User`s guide
Table Of Contents
- Agilent E3632A DC Power Supply
- Table of Contents
- List of Figures
- List of Tables
- 1 Getting Started
- 2 Operation and Features
- Overview
- Constant Voltage Operation
- Constant Current Operation
- Storing and Recalling Operating States
- Programming the Overvoltage Protection
- Programming the Overcurrent Protection
- Remote Voltage Sensing
- Disabling the Output
- System-Related Operations
- Remote Interface Configuration
- GPIB Interface Configuration
- RS-232 Interface Configuration
- Calibration
- 3 Remote Interface Reference
- SCPI Command Summary
- Introduction to the SCPI Language
- Simplified Programming Overview
- Using the APPLy Command
- Output Settings and Operation Commands
- Triggering Commands
- System-Related Commands
- Calibration Commands
- RS-232 Interface Commands
- SCPI Status Registers
- What is an event register?
- What is an enable register?
- SCPI status system
- The Questionable Status register
- The Standard Event register
- The Status Byte register
- Using Service Request (SRQ) and Serial POLL
- Using *STB? to read the Status Byte
- Using the Message Available Bit (MAV)
- To interrupt your bus controller using SRQ
- To determine when a command sequence is completed
- Using *OPC to signal when data is in the output buffer
- Status Reporting Commands
- Halting an Output in Progress
- SCPI Conformance Information
- IEEE-488 Conformance Information
- 4 Error Messages
- 5 Application Programs
- 6 Tutorial
- 7 Characteristics and Specifications

Operation and Features 2
Disabling the Output
E3632A User’s Guide 45
Disconnecting the output using an external relay
When the output of the E3632A is turned off, it is
implemented by setting the output to 0 V and 0.02 A. This
gives a zero output voltage without actually disconnecting
the output. To disconnect the output an external relay must
be connected between the output and the load. A TTL signal
of either low true or high true is provided to control an
external relay. This signal can only be controlled with the
remote command OUTPut:RELay {OFF|ON}. The TTL
output is available on the RS- 232 connection pin 1 and
pin 9.
When the OUTPut:RELay state is ON, the TTL output of pin
1 is high (4.5 V) and pin 9 is low (0.5 V). The levels are
reversed when the OUTPut:RELay state is OFF.
Knob locking
The knob locking function can be used to disable the knob,
thereby preventing any unwanted changes during an
experiment, or when you leave the power supply unattended.
To disable the knob, press the resolution selection key until
the blinking digit disappears.
Notice that the knob and front panel keys are disabled when
in the remote interface mode.
NOTE
• TTL output of pin 1 or pin 9 of the RS-232 connector is available only
after installing two jumpers inside the power supply. Refer to the
Service Guide (E3632-90010) for more information.
• Do not use the RS-232 interface if you have configured the power
supply to output relay control signals. Internal components on the
RS-232 circuitry may be damaged.