User's Guide | Agilent Technologies 6641A User`s guide

User’s Guide
Part Number: E3631-90002
Eighth Edition, April 21, 2014
© Copyright Agilent Technologies, Inc. 2000–2014
All Rights Reserved.
Agilent E3631A
Triple Output
DC Power Supply
The Agilent E3631A is a high performance 80 watt-triple output DC power
supply with GPIB and RS-232 interfaces. The combination of bench-top and system
features in this power supply provides versatile solutions for your design and test
requirements.
Convenient bench-top features
• Triple output
• Easy-to-use knob control for voltage and current settings
• Highly visible vacuum-fluorescent display for voltage and current meters
• Tracking operation for ±25V outputs
• Excellent load and line regulation and low ripple and noise
• Operating states storage
• Portable, ruggedized case with non-skid feet
Flexible system features
• GPIB (IEEE-488) and RS-232 interfaces are standard
• SCPI (Standard Commands for Programmable Instruments) compatibility
• I/O setup easily done from front-panel
Agilent E3631A
Triple Output
DC Power Supply
The Front Panel at a Glance
1
2
3
4
5
6
Meter and adjust selection keys
Tracking enable/disable key
Display limit key
Recall operating state key
Store operating state/Local key
Error/Calibrate key
7 I/O Configuration / Secure key
8 Output On/Off key
9 Control knob
10 Resolution selection keys
11 Voltage/current adjust selection key
3
1 Meter and adjust selection keys Select the output voltage and current of any one
supply (+6V, +25V, or -25V output) to be monitored on the display and allow knob
adjustment of that supply.
2 Tracking enable / disable key Enables / disables the track mode of ±25V supplies.
3 Display limit key Shows the voltage and current limit values on the display and
allows knob adjustment for setting limit values.
4 Recall operating state key Recalls a previously stored operating state from
location “1”, “2”, or “3”.
5 Store operating state / Local key1 Stores an operating state in location “1”, “2”,
or “3” / or returns the power supply to local mode from remote interface mode.
6 Error / Calibrate key2 Displays error codes generated during operations, self-test
and calibration / or enables calibration mode (the power supply must be unsecured
before performing calibration).
7 I/O Configuration / Secure key3 Configures the power supply for remote
interfaces / or secure and unsecure the power supply for calibration.
8 Output On/Off key Enables or disables all three power supply outputs. This key
toggles between two states.
9 Control knob Increases or decreases the value of the blinking digit by turning
clockwise or counter clockwise.
10 Resolution selection keys Move the flashing digit to the right or left.
11 Voltage/current adjust selection key Selects the knob function to voltage control or
current control.
1
The key can be used as the “Local” key when the power supply is in the remote
interface mode.
2
You can enable the “calibration mode” by holding down this key when you
turn on the power supply.
3You
can use it as the “Secure” or “Unsecure” key when the power supply is
in the calibration mode.
4
Front-Panel Voltage and Current Limit Settings
You can set the voltage and current limit values from the front panel
using the following method.
Use the voltage/current adjust selection key, the resolution selection keys, and
the control knob to change the monitoring or limiting value of voltage or current.
1 Press the Display Limit key after turning on the power supply.
2 Set the knob to the voltage control mode or current control mode using the
voltage/current adjust selection key.
3 Move the blinking digit to the appropriate position using the resolution selection keys.
4 Change the blinking digit to the desired value using the control knob.
5 Press the Output On/Off key to enable the output. After about 5 seconds, the
display will go to the output monitor mode automatically to display the voltage
and current at the output.
Note
All front panel keys and controls can be disabled with remote interface commands.
The Agilent E3631A must be in “Local” mode for the front panel keys and controls
to function.
5
Display Annunciators
Adrs
Power supply is addressed to listen or talk over a remote interface.
Rmt
Power supply is in remote interface mode.
+6V
Displays the output voltage and current for +6V supply. Knob is active for
+6V supply.
+25V
Displays the output voltage and current for +25V supply. Knob is active for
+25V supply.
-25V
Displays the output voltage and current for -25V supply. Knob is active for
-25V supply.
CAL
power supply is in calibration mode.
Track
The outputs of +25V and -25V supplies are in track mode.
Limit
The display shows the voltage and current limit value of a selected supply.
ERROR
Hardware or remote interface command errors are detected and also the
error bit has not been cleared.
OFF
The three outputs of the power supply are disabled.
Unreg
The displayed output is unregulated (output is neither CV nor CC).
CV
The displayed output is in constant-voltage mode.
CC
The displayed output is in constant-current mode.
To review the display annunciators, hold down Display Limit key as you
turn on the power supply.
6
The Rear Panel at a Glance
1 Power-line voltage setting
2 Power-line fuse-holder assembly
3 AC inlet
4 Power-line module
5 GPIB (IEEE-488) interface connector
6 RS-232 interface connector
Use the front-panel I/O Config key to:
• Select the GPIB or RS-232 interface (see chapter 3).
• Set the GPIB bus address (see chapter 3).
• Set the RS-232 baud rate and parity (see chapter 3).
7
In This Book
General Information Chapter 1 contains a general description of your power supply.
This chapter also provides instructions for checking your
power supply, connecting to ac power, and selecting power-line voltage.
Initial Operation Chapter 2 ensures that the power supply develops its
rated outputs and properly responds to operation from the front panel.
Front-Panel Operation Chapter 3 describes in detail the use of
front-panel keys and how they are used to operate the power supply from
the front panel. This chapter also shows how to configure the power supply for the
remote interface and gives a brief introduction to the calibration features.
Remote Interface Reference Chapter 4 contains reference information
to help you program the power supply over the remote interface. This
chapter also explains how to program for status reporting.
Error Messages Chapter 5 lists the error messages that may appear as you are
working with the power supply. Each listing contains information to help you diagnose
and solve the problem.
Application Programs Chapter 6 contains some remote interface applications to
help you develop programs for your application.
Tutorial Chapter 7 describes basic operation of linear power supplies and gives
specific details on the operation and use of the Agilent E3631A power supplies.
Specifications
Chapter 8 lists the power supply’s specifications.
If you have questions relating to the operation of the power supply, call
1-800-829-4444 in the United States, or contact your nearest Agilent
Technologies Sales Office.
8
Environmental Conditions
This instrument is designed for indoor use and in an area with low condensation. The
table below shows the general environmental requirements for this instrument.
Environmental condition
Requirements
Temperature
Operating condition
• 0 °C to 40 °C
Storage condition
• –20 °C to 70 °C
Humidity
Up to 80% RH
Altitude
Up to 2000 m
Installation category
II
Pollution degree
2
9
Declaration of Conformity
The Declaration of Conformity (DoC) for this instrument is available on the Agilent
Web site. You can search the DoC by its product model or description at the web
address below.
http://regulations.corporate.agilent.com/DoC/search.htm
Note
If you are unable to search for the respective DoC, please contact your local Agilent
representative.
10
Contents
Chapter 1 General Information
Safety Considerations- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Safety and EMC Requirements - - - - - - - - - - - - - - - - - - - - - - - Options and Accessories - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Options - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Accessories - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Installation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Initial Inspection - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Cooling and Location- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Input Power Requirements - - - - - - - - - - - - - - - - - - - - - - - - - - - Power-Line Cord- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Power-Line Voltage Selection - - - - - - - - - - - - - - - - - - - - - - - - -
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Chapter 2 Initial Operation
Preliminary Checkout- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Power-On Checkout- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Output Checkout - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Voltage Output Checkout - - - - - - - - - - - - - - - - - - - - - - - - - - - Current Output Checkout - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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33
Chapter 3 Front-Panel Operation
Front-Panel Operation Overview - - - - - - - - - - - - - - - - - - - - - - - Constant Voltage Operation - - - - - - - - - - - - - - - - - - - - - - - - - - Constant Current Operation- - - - - - - - - - - - - - - - - - - - - - - - - - - Tracking Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Storing and Recalling Operating States - - - - - - - - - - - - - - - - - - - Disabling the Outputs- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Knob Locking - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - System-Related Operations - - - - - - - - - - - - - - - - - - - - - - - - - - - Self-Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Error Conditions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Display Control - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Firmware Revision Query- - - - - - - - - - - - - - - - - - - - - - - - - - - SCPI Language Version - - - - - - - - - - - - - - - - - - - - - - - - - - - - Remote Interface Configuration - - - - - - - - - - - - - - - - - - - - - - - - Remote Interface Selection - - - - - - - - - - - - - - - - - - - - - - - - - - GPIB Address- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Baud Rate Selection (RS-232)- - - - - - - - - - - - - - - - - - - - - - - - -
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51
11
Parity Selection (RS-232)- - - - - - - - - - - - - - - - - - - - - - - - - - - To Set the GPIB Address - - - - - - - - - - - - - - - - - - - - - - - - - - - To Set the Baud Rate and Parity (RS-232) - - - - - - - - - - - - - - - GPIB Interface Configuration - - - - - - - - - - - - - - - - - - - - - - - - - RS-232 Interface Configuration - - - - - - - - - - - - - - - - - - - - - - - - RS-232 Configuration Overview - - - - - - - - - - - - - - - - - - - - - - RS-232 Data Frame Format - - - - - - - - - - - - - - - - - - - - - - - - - Connection to a Computer or Terminal- - - - - - - - - - - - - - - - - - DTR/DSR Handshake Protocol - - - - - - - - - - - - - - - - - - - - - - - RS-232 Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - - - - Calibration Overview- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Calibration Security - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Calibration Count - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Calibration Message - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
51
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64
64
Chapter 4 Remote Interface Reference
SCPI Command Summary - - - - - - - - - - - - - - - - - - - - - - - - - - - Simplified Programming Overview - - - - - - - - - - - - - - - - - - - - - Using the APPLy Command- - - - - - - - - - - - - - - - - - - - - - - - - Using the Low-Level Commands - - - - - - - - - - - - - - - - - - - - - Reading a Query Response - - - - - - - - - - - - - - - - - - - - - - - - - - Selecting a Trigger Source - - - - - - - - - - - - - - - - - - - - - - - - - - Programming Ranges and Output Identifiers - - - - - - - - - - - - - - Using the APPLy Command - - - - - - - - - - - - - - - - - - - - - - - - - - Output Setting and Operation Commands - - - - - - - - - - - - - - - - - Output Selection Commands - - - - - - - - - - - - - - - - - - - - - - - - Measurement Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - Output On/Off and Tracking Operation Commands - - - - - - - - - Output Setting Commands - - - - - - - - - - - - - - - - - - - - - - - - - - Triggering Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Trigger Source Choices - - - - - - - - - - - - - - - - - - - - - - - - - - - - Triggering Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - - System-Related Commands - - - - - - - - - - - - - - - - - - - - - - - - - - Calibration Commands- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - RS-232 Interface Commands- - - - - - - - - - - - - - - - - - - - - - - - - - The SCPI Status Registers - - - - - - - - - - - - - - - - - - - - - - - - - - - What is an Event Register? - - - - - - - - - - - - - - - - - - - - - - - - - - What is an Enable Register? - - - - - - - - - - - - - - - - - - - - - - - - - What is a Multiple Logical Output? - - - - - - - - - - - - - - - - - - - - SCPI Status System- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - The Questionable Status Register - - - - - - - - - - - - - - - - - - - - - The Standard Event Register- - - - - - - - - - - - - - - - - - - - - - - - - 12
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95
The Status Byte Register - - - - - - - - - - - - - - - - - - - - - - - - - - - - 96
Using Service Request (SRQ) and Serial POLL - - - - - - - - - - - - - 97
Using *STB? to Read the Status Byte- - - - - - - - - - - - - - - - - - - - 98
Using the Message Available Bit (MAV) - - - - - - - - - - - - - - - - - 98
To Interrupt Your Bus Controller Using SRQ - - - - - - - - - - - - - - 98
To Determine When a Command Sequence is Completed - - - - - - 99
Using *OPC to Signal When Data is in the Output Buffer - - - - - - 99
Status Reporting Commands - - - - - - - - - - - - - - - - - - - - - - - - - - 100
An Introduction to the SCPI Language - - - - - - - - - - - - - - - - - - - 104
Command Format Used in This Manual - - - - - - - - - - - - - - - - - 105
Command Separators- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 106
Using the MIN and MAX parameters - - - - - - - - - - - - - - - - - - - 106
Querying Parameter Settings- - - - - - - - - - - - - - - - - - - - - - - - - 107
SCPI Command Terminators - - - - - - - - - - - - - - - - - - - - - - - - 107
IEEE-488.2 Common Commands - - - - - - - - - - - - - - - - - - - - - 107
SCPI Parameter Types - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 108
Halting an Output in Progress - - - - - - - - - - - - - - - - - - - - - - - - - 109
SCPI Conformance Information - - - - - - - - - - - - - - - - - - - - - - - - 110
IEEE-488 Conformance information - - - - - - - - - - - - - - - - - - - - 113
Chapter 5 Error Messages
Execution Errors - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 117
Self-Test Errors - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 123
Calibration Errors - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 124
Chapter 6 Application
Programs
Agilent BASIC Programs - - - - - - - - - - - - - - - - - - - - - - - - - - - C and QuickBASIC Language Programs - - - - - - - - - - - - - - - - - Using the APPLy Command - - - - - - - - - - - - - - - - - - - - - - - - - Using the Low-Level Commands - - - - - - - - - - - - - - - - - - - - - - Using the Status Registers- - - - - - - - - - - - - - - - - - - - - - - - - - - RS-232 Operation Using QuickBASIC - - - - - - - - - - - - - - - - - - -
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139
Chapter 7 Tutorial
Overview of Agilent E3631A Operation - - - - - - - - - - - - - - - - - Output Characteristics - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Unregulated State - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Unwanted Signals - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Connecting the Load - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Output Isolation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Multiple Loads - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
143
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149
13
Load Consideration - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Extending the Voltage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Series Connections - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Remote Programming - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Reliability - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
150
152
152
153
155
Chapter 8 Specifications
Performance Specifications- - - - - - - - - - - - - - - - - - - - - - - - - - - 159
Supplemental Characteristics - - - - - - - - - - - - - - - - - - - - - - - - - 161
14
1
1
General Information
General Information
This chapter provides a general description of your power supply. This
chapter also contains instructions for initial inspection, location and cooling for bench
and rack operation, selecting the power-line voltage, and
connecting your power supply to ac power.
16
Chapter 1 General Information
Safety Considerations
1
Safety Considerations
This power supply is a Safety Class I instrument, which means that it has a protective
earth terminal. That terminal must be connected to earth ground through a power
source with a 3-wire ground receptacle.
Before installation or operation, check the power supply and review this manual for
safety markings and instructions. Safety information for specific procedures is located
at the appropriate places in this manual. See also “Safety” at the beginning of this
manual for general safety information.
Safety and EMC Requirements
This power supply is designed to comply with the following safety and EMC
(Electromagnetic Compatibility) requirements:
Safety
• IEC 61010-1:2001 / EN 61010-1:2001
• CAN/CSA-C22.2 No. 61010.1-04
• ANSI/UL61010-1:2004
EMC
• IEC 61326-1:2005/EN61326-1:2006
• CISPR11:2003/EN55011:2007
• Canada: ICES/NMB-001:Issue 4, June 2006
• Australia/New Zealand: AS/NZS CISPR 11:2004
17
Chapter 1 General Information
Options and Accessories
Options and Accessories
Options
Options 0EM, 0E3, and 0E9 determine which power-line voltage is selected at
the factory. The standard unit is configured for 115 Vac ± 10%, 47-63 Hz input voltage.
For more information about changing the power-line voltage setting, see ‘‘Power-Line
Voltage Selection’’, starting on page 24 in this chapter.
Option
Description
0EM
115 Vac ± 10%, 47-63 Hz input voltage
0E3
0E9
1CM
0L2
230 Vac ± 10%, 47-63 Hz input voltage
100 Vac ± 10%, 47-63 Hz input voltage
Rack mount kit (Agilent part number 5062-3957)
Extra English manual set (local language manual files are included
on the CD-ROM, Agilent part number 5964-8251.)
Accessories
The accessories listed below may be ordered from your local Agilent Technologies
Sales Office either with the power supply or separately.
Agilent No.
Description
10833A
10833B
34398A
GPIB cable, 1 m (3.3 ft.)
GPIB cable, 2 m (6.6 ft.)
RS-232, 9 pin (f) to 9 pin (f), 2.5 m (8.2 ft.) cable; plus 9 pin (m)
to 25 pin (f) adapter
RS-232 adapter kit (contains 4 adapters):
9 pin (m) to 25 pin (m) for use with PC or printer
9 pin (m) to 25 pin (f) for use with PC or printer
9 pin (m) to 25 pin (m) for use with modem
9 pin (m) to 9 pin (m) for use with modem
34399A
18
Chapter 1 General Information
Description
1
Description
The Agilent E3631A power supply features a combination of programming
capabilities and linear power supply performance that makes it ideal for power
systems applications. The triple power supply delivers 0 to ± 25 V outputs rated at 0
to 1 A and 0 to +6 V output rated at 0 to 5 A. The ± 25Vsupplies also provide 0 to ±
25 V tracking output to power operational amplifiers and circuits requiring
symmetrically balanced voltages. The 0 to ± 25V outputs track each other within
±(0.2% output + 20 mV) in the track mode. The ± 25V outputs can also be used in
series as a single 0 to 50 V/1 A supply.
The voltage and current of each supply can be adjusted independently from the front
panel or programmed over the GPIB or RS-232 interface. Using the front panel keys
and the control knob, you can adjust the voltage and current of a selected output;
enable or disable track mode; store and recall operating states; enable or disable three
outputs; calibrate the power supply including changing the calibration security; return
the power supply to local operating mode; and configure the power supply for remote
interface operation.
From the front-panel VFD (vacuum-fluorescent display), you can monitor actual
values of output voltage and current (meter mode) or voltage and current limit values
(limit mode), check the operating status of the power supply from the annunciators,
and check the type of error from the displayed error codes (messages).
When operated over the remote interface, the power supply can be both a listener and
a talker. Using an external controller, you can instruct the power supply to set outputs
and to send the status data back over the GPIB or RS-232. Readback capabilities
include reading back output voltage and current; present and stored status; and error
messages. The following functions are implemented over the GPIB or RS-232:
•
•
•
•
•
•
•
•
Voltage and current programming
Voltage and current readback
Enable or disable track mode
Present and stored status readback
Programming syntax error detection
Voltage and current calibration
Output on or off
Self-test
19
Chapter 1 General Information
Description
The front panel includes a VFD for displaying the output voltage and current. Two
4-digit voltage and current meters accurately show the actual or limit values of a
selected supply simultaneously. Three meter selection keys choose the voltage and
current of any one output to be monitored on the display.
Connections to the power supply's output and to chassis ground are made to binding
posts on the front panel. The +25V and -25V supply's outputs share a common output
terminal which is isolated from chassis ground. The positive and negative terminals
of each output can be grounded, or each output can be kept within ±240 Vdc from the
chassis ground. The power supply is shipped with a detachable, 3-wire grounding
type power cord. The ac line fuse is an extractor type on the rear panel.
The power supply can be calibrated from the front panel directly or with a controller
over the GPIB or RS-232 interface using calibration commands. Correction factors
are stored in non-volatile memory and are used during output programming.
Calibration from the front panel or a controller eliminates the need to remove the top
cover or even the need to remove the power supply from your system cabinet. You
can guard against unauthorized calibration by using the “Secured” calibration
protection function.
20
Chapter 1 General Information
Installation
1
Installation
Initial Inspection
When you receive your power supply, inspect it for any obvious damage that may
have occurred during shipment. If any damage is found, notify the carrier and the
nearest Agilent Sales Office immediately. Warranty information is shown in the front
of this manual.
Keep the original packing materials in case the power supply has to be returned to
Agilent Technologies in the future. If you return the power supply for service, attach
a tag identifying the owner and model number. Also include a brief description of the
problem.
Mechanical Check
This check confirms that there are no broken keys or knob, that the cabinet and panel
surfaces are free of dents and scratches, and that the display is not scratched or cracked.
Electrical Check
Chapter 2 describes an initial operation procedure which, when successfully
completed, verifies to a high level of confidence that the power supply is operating
in accordance with its specifications. Detailed electrical verification procedures are
included in the Service Guide.
Cooling and Location
Cooling
The power supply can operate without loss of performance within the temperature
range of 0 °C to 40 °C, and with derated output current from 40 °C to 55 °C. A fan
cools the power supply by drawing air through the rear panel and exhausting it out
the sides. Using an Agilent rack mount will not impede the flow of air.
Bench Operation
Your power supply must be installed in a location that allows sufficient space at the
sides and rear of the power supply for adequate air circulation. The rubber bumpers
must be removed for rack mounting.
21
Chapter 1 General Information
Installation
Rack Mounting
The power supply can be mounted in a standard 19-inch rack cabinet using one of
three optional kits available. A rack-mounting kit for a single instrument is available
as Option 1CM (P/N 5063-9243). Installation instructions and hardware are included
with each rack-mounting kit. Any Agilent System II instrument of the same size can
be rack-mounted beside the Agilent E3631A power supply.
Remove the front and rear bumpers before rack-mounting the power
supply.
Front
Rear (bottom view)
To remove the rear bumper, pull the bumper off from the top as there are
protrusions on the sides and bottom of the cover.
To rack mount a single instrument, order adapter kit 5063-9243.
22
Chapter 1 General Information
Installation
1
To rack mount two instruments of the same depth side-by-side, order
lock-link kit 5061-9694 and flange kit 5063-9214.
To install two instruments in a sliding support shelf, order support shelf
5063-9256, and slide kit 1494-0015.
23
Chapter 1 General Information
Input Power Requirements
Input Power Requirements
You can operate your power supply from a nominal 100 V, 115 V, or 230 V single
phase ac power source at 47 to 63 Hz. An indication on the rear panel shows the
nominal input voltage set for the power supply at the factory. If necessary, you can
change the power-line voltage setting according to the instructions on the next page.
Power-Line Cord
The power supply is shipped from the factory with a power-line cord that has a plug
appropriate for your location. Contact the nearest Agilent Sales and Service Office if
the wrong power-line cord is included with your power supply. Your power supply is
equipped with a 3-wire grounding type power cord; the third conductor being the
ground. The power supply is grounded only when the power-line cord is plugged into
an appropriate receptacle. Do not operate your power supply without adequate cabinet
ground connection.
Power-Line Voltage Selection
Power-line voltage selection is accomplished by adjusting two components:
power-line voltage selector and power-line fuse on the power-line module of the rear
panel. To change the power-line voltage, proceed as follows:
24
Chapter 1 General Information
Input Power Requirements
1
1 Remove the power cord. Remove the fuse-holder
assembly with a flat-blade screwdriver from the
rear panel.
2 Install the correct line fuse. Remove the powerline voltage selector from the power-line module.
3 Rotate the power-line voltage selector until the
correct voltage appears.
4 Replace the power-line voltage selector and the
fuse-holder assembly in the rear panel.
25
THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
26
2
2
Initial Operation
Initial Operation
There are three basic tests in this chapter. The automatic power-on test includes a selftest that checks the internal microprocessors and allows the user visually to check the
display. The output check ensures that the power supply develops its rated outputs
and properly responds to operation from the front panel. For complete performance
and/or verification tests, refer to the Service Guide.
This chapter is intended for both the experienced and the inexperienced user because
it calls attention to certain checks that should be made prior to operation.
Throughout this chapter the key to be pressed is shown in the left margin.
28
Chapter 2 Initial Operation
Preliminary Checkout
Preliminary Checkout
The following steps help you verify that the power supply is ready for use.
2
1 Verify the power-line voltage setting on the rear panel.
The power-line voltage is set to the proper value for your country when the power
supply is shipped from the factory. Change the voltage setting if it is not correct. The
settings are: 100, 115, or 230 Vac.
2 Verify that the correct power-line fuse is installed.
The correct fuse is installed for your country when the power supply is shipped from
the factory. For 100 or 115 Vac operation, you must use a 2.5 AT fuse. For 230 Vac
operation, you must use a 2.0 AT fuse.
3 Connect the power-line cord and turn on your power supply.
The front-panel display will light up and a power-on self-test occurs automatically
when you turn on the power supply.
See “Power-Line Voltage Selection”, starting on page 24 in chapter 1 if you need to
change the power-line voltage or the power-line fuse.
To replace the 2.5 AT fuse, order Agilent part number 2110-0913.
To replace the 2 AT fuse, order Agilent part number 2110-0982.
29
Chapter 2 Initial Operation
Power-On Checkout
Power-On Checkout
The power-on test includes an automatic self-test that checks the internal
microprocessors and allows the user visually to check the display. You will observe
the following sequence on the display after pressing the front panel power switch to
on.
1 All segments of the display including all annunciators will turn on for about one
second.
To review the annunciators, hold down the Display Limit key as you
turn on the power supply.
2 The GPIB address or RS-232 message will then be displayed for about one
second.
ADDR 5 (or RS-232)
The GPIB address is set to “5” when the power supply is shipped from the factory
for remote interface configuration. If this is not the first time the power supply is
turned on, a different interface (RS-232) or a different GPIB address may appear.
See ‘‘Remote Interface Configuration’’, for more information starting on page 50 in
chapter 3 if you need to change the remote interface configuration.
3 The “OFF” and “+6V” annunciators are on. All others are off.
The power supply will go into the power-on / reset state; all outputs are disabled (the
OFF annunciator turns on); the display is selected for the +6V supply (the +6V
annunciator turns on); and the knob is selected for voltage control.
4 Enable the outputs.
Output On/Off
Note
Press the Output On/Off key to enable the outputs. The OFF annunciator turns off
and the +6V and CV annunciators are lit. The blinking digit can be adjusted by turning
the knob. Notice that the display is in the meter mode. “Meter mode” means that the
display shows the actual output voltage and current.
If the power supply detects an error during power-on self-test, the ERROR
annunciator will turn on. See “Error Messages”, for more information starting on
page 115 in chapter 5
30
Chapter 2 Initial Operation
Output Checkout
Output Checkout
The following procedures check to ensure that the power supply develops its rated
outputs and properly responds to operation from the front panel. For complete
performance and verification tests, refer to the Service Guide.
For each step, use the keys shown on the left margins.
Voltage Output Checkout
The following steps verify basic voltage functions with no load.
1 Turn on the power supply.
Power
The power supply will go into the power-on / reset state; all outputs are disabled (the
OFF annunciator turns on); the display is selected for the +6V supply (the +6V
annunciator turns on); and the knob is selected for voltage control.
2 Enable the outputs.
Output On/Off
The OFF annunciator turns off and the +6V and CV annunciators are lit. The blinking
digit can be adjusted by turning the knob. Notice that the display is in the meter mode.
“Meter mode” means that the display shows the actual output voltage and current.
3 Check that the front-panel voltmeter properly responds to knob control for the
+6V supply.
Turn the knob clockwise or counter clockwise to check that the voltmeter responds
to knob control and the ammeter indicates nearly zero.
1
4 Ensure that the voltage can be adjusted from zero to the maximum rated value.
Adjust the knob until the voltmeter indicates 0 volts and then adjust the knob until
the voltmeter indicates 6.0 volts.
1
You can use the resolution selection keys to move the blinking digit to the right or left when
setting the voltage.
31
2
Chapter 2 Initial Operation
Output Checkout
+25V
5 Check the voltage function for the +25V supply.
Select the meter and adjust selection key for the +25V supply. The CV annunciator
is still lit and the +25V annunciator will turn on. Repeat steps (3) and (4) to check the
voltage function for the +25V supply.
-25V
6 Check the voltage function for the -25V supply.
Select the meter and adjust selection key for the -25V supply. The CV annunciator is
still lit and the -25V annunciator will turn on. Repeat steps (3) and (4) to check the
voltage function for the -25V supply.
32
Chapter 2 Initial Operation
Output Checkout
Current Output Checkout
The following steps check basic current functions with a short across the appropriate
supply’s output.
Power
1 Turn on the power supply.
The power supply will go into the power-on / reset state; all outputs are disabled
(the OFF annunciator turns on); the display is selected for the +6V supply (the +6V
annunciator turns on); and the knob is selected for voltage control.
Output On/Off
2 Connect a short across (+) and (-) output terminals of the +6V supply with an
insulated test lead.
3 Enable the outputs.
The OFF annunciator turns off and the +6V annunciator turns on. The CV or CC
annunciator is lit depending on the resistance of the test lead. The blinking digit can
be adjusted by turning the knob. Notice that the display is in the meter mode. “Meter
mode” means that the display shows the actual output voltage and current.
4 Adjust the voltage limit value to 1.0 volt.
Display Limit
Set the display to the limit mode (the Lmt annunciator will be blinking). Adjust the
voltage limit to 1.0 volt to assure CC operation. The CC annunciator will light.
5 Check that the front-panel ammeter properly responds to knob control for the
+6V supply.
Vol/Cur
Set the knob to the current control, and turn the knob clockwise or counter clockwise
when the display is in the meter mode (the Lmt annunciator is off). Check that the
ammeter responds to knob control and the voltmeter indicates nearly zero (actually,
the voltmeter will show the voltage drop caused by the test lead).
33
2
Chapter 2 Initial Operation
Output Checkout
1
6 Ensure that the current can be adjusted from zero to the maximum rated value.
Adjust the knob until the ammeter indicates 0 amps and then until the ammeter
indicates 5.0 amps.
7 Check the current function for the +25V supply.
+25V
Disable the outputs by pressing the Output On/Off key and connect a short across
(+) and (COM) output terminals of the ±25V supply with an insulated test lead. Repeat
steps (3) through (6) after selecting the meter and adjust selection key for the +25V
supply.
8 Check the current function for the -25V supply.
-25V
Disable the outputs by pressing the Output On/Off key and connect a short across
(-) and (COM) output terminals of ±25V supply with an insulated test lead. Repeat
steps (3) through (6) after selecting the meter and adjust selection key for the -25V
supply.
Note
If an error has been detected during the output checkout procedures, the ERROR
annunciator will turn on. See “Error Messages”, for more information starting on
page 115 in chapter 5
1You can use the resolution selection keys to move the blinking digit to the right or left when
setting the current.
34
3
3
Front-Panel Operation
Front-Panel Operation
So far you have learned how to install your power supply and perform initial operation.
During the initial operation, you were briefly introduced to operating from the front
panel as you learned how to check basic voltage and current functions. This chapter
will describe in detail the use of these front-panel keys and show how they are used
to accomplish power supply operation.
• Front-Panel Operation Overview, page 37
• Constant Voltage Operation, page 38
• Constant Current Operation, page 40
• Tracking Operation, page 42
• Storing and Recalling Operating States, page 43
• Disabling the Outputs, page 45
• Knob Locking, page 45
• System-Related Operations, page 46
• Remote Interface Configuration, page 50
• GPIB Interface Configuration, page 55
• RS-232 Interface Configuration, page 56
• Calibration Overview, page 60
Throughout this chapter the key to be pressed is shown in the left margin.
Note
See “Error Messages”, starting on page 115 chapter 5 if you encounter any errors
during front-panel operation
36
Chapter 3 Front-Panel Operation
Front-Panel Operation Overview
Front-Panel Operation Overview
The following section describes an overview of the front-panel keys before operating
your power supply.
• The power supply is shipped from the factory configured in the front-panel
operation mode. At power-on, the power supply is automatically set to operate
in the front-panel operation mode. When in this mode, the front-panel keys can
be used. When the power supply is in remote operation mode, you can return to
front-panel operation mode at any time by pressing the Local key if you did
not previously send the front-panel lockout command. A change between frontpanel and remote operation modes will not result in a change in the output
parameters.
3
• When you press the Display Limit key (the Lmt annunciator blinks), the display
of the power supply goes to the limit mode and the present limit values of the
selected supply will be displayed. In this mode, you can also observe the change
of the limit values when adjusting the knob. If you press the Display Limit key
again or let the display time-out after several seconds, the power supply will return
the display to the meter mode (the Lmt annunciator turns off). In this mode, the
actual output voltage and current will be displayed.
• All outputs of the power supply can be enabled or disabled from the front panel
using the Output On/Off key. When the output of the power supply is off, the
OFF annunciator turns on and the three outputs are disabled.
• The display provides the present operating status of the power supply with
annunciators and also informs the user of error codes. For example, the +6V supply
is operating in CV mode and controlled from the front panel, then the CV and +6V
annunciators will turn on. If, however, the power supply is remotely controlled,
the Rmt annunciator will also turn on, and when the power supply is being
addressed over GPIB interface, the Adrs annunciator will turn on. See ‘‘Display
Annunciators’’ on page 6 for more information.
37
Chapter 3 Front-Panel Operation
Constant Voltage Operation
Constant Voltage Operation
To set up the power supply for constant voltage (CV) operation, proceed as follows.
1 Connect a load to the desired output terminals.
With power-off, connect a load to the desired output terminals.
2 Turn on the power supply.
Power
The power supply will go into the power-on / reset state; all outputs are disabled (the
OFF annunciator turns on); the display is selected for the +6V supply (the +6V
annunciator turns on); and the knob is selected for voltage control.
3 Enable the outputs.
Output On/Off
The OFF annunciator turns off and the +6V and CV annunciators are lit. The blinking
digit can be adjusted by turning the knob. Notice that the display is in the meter mode.
“Meter mode” means that the display shows the actual output voltage and current.
To set up the power supply for +25V supply or -25V supply operation, you should
press the +25V or -25V key to select the display and adjust for +25V supply or
-25V supply before proceeding to the next step.
4 Set the display for the limit mode.
Display Limit
Notice that the Lmt annunciator blinks, indicating that the display is in the limit mode.
When the display is in the limit mode, you can see the voltage and current limit values
of the selected supply.
In constant voltage mode, the voltage values between the meter mode and limit
mode are the same, but the current values are not. Further if the display is in the
meter mode, you cannot see the change of current limit value when adjusting the
knob. We recommend that you should set the display to “limit” mode to see the
change of current limit value in the constant voltage mode whenever adjusting the
knob.
38
Chapter 3 Front-Panel Operation
Constant Voltage Operation
Vol/Cur
5 Adjust the knob for the desired current limit.
1
Check that the Lmt annunciator still blinks. Set the knob for current control. The
second digit of ammeter will be blinking. Adjust the knob to the desired current limit.
6 Adjust the knob for the desired output voltage.
Vol/Cur
1
Set the knob for voltage control. The second digit of the voltmeter will be blinking.
Adjust the knob to the desired output voltage.
7 Return to the meter mode.
Display Limit
Press the Display Limit key or let the display time-out after several seconds to
return to the meter mode. Notice that the Lmt annunciator turns off and the display
returns to the meter mode. In the meter mode, the display shows the actual output
voltage and current of the selected supply.
3
8 Verify that the power supply is in the constant voltage mode.
If you operate the +6V supply in the constant voltage (CV) mode, verify that CV and
+6V annunciators are lit. If you operate the power supply for the +25V supply or the
-25V supply, the +25V or -25V annunciator will turn on. If the CC annunciator is lit,
choose a higher current limit.
Note
During actual CV operation, if a load change causes the current limit to be
exceeded, the power supply will automatically crossover to the constant
current mode at the preset current limit and the output voltage will drop
proportionately.
1You can use the resolution selection keys to move the blinking digit to the right or left when
setting the voltage and current.
39
Chapter 3 Front-Panel Operation
Constant Current Operation
Constant Current Operation
To set up the power supply for constant current (CC) operation, proceed as follows.
1 Connect a load to the output terminals of the desired supply.
With power-off, connect a load to the desired output terminals.
2 Turn on the power supply.
Power
The power supply will go into the power-on / reset state; all outputs are disabled (the
OFF annunciator turns on); the display is selected for the +6V supply (the +6V
annunciator turns on); and the knob is selected for voltage control.
3 Enable the outputs.
Output On/Off
The OFF annunciator turns off and the +6V and CV annunciators are lit. The blinking
digit can be adjusted by turning the knob. Notice that the display is in the meter mode.
“Meter mode” means that the display shows the actual output voltage and current.
To set up the power supply for +25V supply or -25V supply operation, you should
press the +25V or -25V key to select the display and adjust for +25V supply or
-25V supply before proceeding to the next step.
4 Set the display for the limit mode.
Display Limit
Notice that the Lmt annunciator blinks, indicating that the display is in the limit mode.
When the display is in the limit mode, you can see the voltage and current limit values
of the selected supply.
In constant current mode, the current values between the meter mode and limit
mode are the same, but the voltage values are not. Further if the display is in the
meter mode, you cannot see the change of voltage limit value when adjusting the
knob. We recommend that you should set the display to “limit” mode to see the
change of voltage limit value in the constant current mode whenever adjusting the
knob.
40
Chapter 3 Front-Panel Operation
Constant Current Operation
5 Adjust the knob for the desired voltage limit.
1
Check that the knob is still selected for voltage control and the Lmt annunciator
blinks. Adjust the knob for the desired voltage limit.
Vol/Cur
6 Adjust the knob for the desired output current.
1
Set the knob for current control. The second digit of the ammeter will be blinking.
Adjust the knob to the desired current output.
Display Limit
7 Return to the meter mode.
Press the Display Limit key or let the display time-out after several seconds to
return the meter mode. Notice that the Lmt annunciator turns off and the display
returns to the meter mode. In the meter mode, the display shows the actual output
voltage and current of the selected supply.
3
8 Verify that the power supply is in the constant current mode.
If you operate the +6V supply in the constant current (CC) mode, verify that CC and
+6V annunciators are lit. If you operate the power supply for the +25V supply or the
-25V supply, the +25V or -25V annunciator will turn on. If the CV annunciator is lit,
choose a higher voltage limit.
Note
During actual CC operation, if a load change causes the voltage limit to be exceeded,
the power supply will automatically crossover to constant voltage mode at the preset
voltage limit and the output current will drop proportionately.
1
You can use the resolution selection keys to move the blinking digit to the right or
left when setting the voltage and current.
41
Chapter 3 Front-Panel Operation
Tracking Operation
Tracking Operation
The ±25V supplies provide 0 to ±25 V tracking outputs. In the track mode, two
voltages of the ±25V supplies track each other within ±(0.2% output +20 mV) for
convenience in varying the symmetrical voltages needed by operational amplifiers
and other circuits using balanced positive and negative inputs. The state of track mode
is stored in volatile memory; the track is always off state when power has been off or
after a remote interface reset.
To operate the power supply in the track mode, proceed as follows:
1 Set the +25V supply to the desired voltage as described in previous section
“Constant Voltage Operation”(see page 38 for detailed information).
Track
2 Enable the track mode.
The Track key must be depressed for at least 1 second to enable the track mode.
When the track mode is first enabled, the -25V supply will be set to the same voltage
level as the +25V supply. Once enabled, any change of the voltage level in either the
+25V supply or the -25V supply will be reflected in other supply. The current limit
is independently set for each of the +25V or the -25V supply and is not affected by
the track mode.
3 Verify that the ±25V supplies track each other properly.
You can verify that the voltage of the -25V supply tracks that of the +25V supply
within ±(0.2% of output + 20 mV) from the front-panel display by comparing the
voltage values of the +25V supply and the -25V supply.
In the track mode, if the CC annunciator is lit when the display is selected for the
+25V supply, choose a higher current limit for the +25V supply.
If the CC annunciator is lit when the display is selected for the -25V supply,
choose a higher current limit for the -25V supply.
42
Chapter 3 Front-Panel Operation
Storing and Recalling Operating States
Storing and Recalling Operating States
You can store up to three different operating states in non-volatile memory. This also
enables you to recall the entire instrument configuration with just a few key presses
from the front panel.
The memory locations are supplied from the factory for front panel operation with
the following states: display and knob selection for +6V output; *RST values of
voltage and current limits for three outputs; output disabled; and track off state.
*RST values for +6V supply are 0 V and 5 A and 0 V and 1 A for the ±25V supplies.
3
The following steps show you how to store and recall an operating state.
1 Set up the power supply for the desired operating state.
The storage feature “remembers” the display and knob selection state, the
limit values of voltage and current for three outputs, output on/off state, and track on/
off state.
Store
2 Turn on the storage mode.
Three memory locations (numbered 1, 2 and 3) are available to store the operating
states. The operating states are stored in non-volatile memory and are remembered
when being recalled.
STORE
1
This message appears on the display for approximately 3 seconds.
3 Store the operating state in memory location “3”.
Turn the knob to the right to specify the memory location 3.
STORE
3
To cancel the store operation, let the display time-out after about 3 seconds or press
any other function key except the Store key. The power supply returns to the normal
operating mode and to the function pressed.
43
Chapter 3 Front-Panel Operation
Storing and Recalling Operating States
Store
4 Save the operating state.
The operating state is now stored. To recall the stored state, go to the following steps.
DONE
This message appears on the display for approximately 1 second.
Recall
5 Turn on the recall mode.
Memory location “1” will be displayed in the recall mode.
RECALL
1
This message appears on the display for approximately 3 seconds.
6 Recall the stored operating state.
Turn the knob to the right to change the displayed storage location to “3”.
RECALL
3
If this setting is not followed within 3 seconds with a Recall key stroke, the power
supply returns to normal operating mode and will not recall the instrument state 3
from memory.
Recall
7 Restore the operating state.
The power supply should now be configured in the same state as when you stored the
state on the previous steps.
DONE
This message appears on the display for approximately 1 second.
44
Chapter 3 Front-Panel Operation
Disabling the Outputs
Disabling the Outputs
The outputs of the power supply can be disabled or enabled from the front panel using
the Output On/Off key.
• When the power supply is in the “Off” state, the OFF annunciator turns on and the
three outputs are disabled. The OFF annunciator turns off when the power supply
returns to the “On” state. When the outputs are disabled, the voltage value is 0 volts
and the current value is 0.05 amps.
• The output state is stored in volatile memory; the output is always disabled when
power has been off or after a remote interface reset.
3
While the outputs are disabled, the control knob and resolution selection keys are
still working. If the display is in the meter mode, you cannot see the changes of
output voltage and current settings on the display when turning the knob. To see
or check the changes when the outputs are disabled, the display should be in the
limit mode.
• Front-panel operation:
You can disable the outputs by pressing the Output On/Off key. This key toggles
between the output Off and On states.
• Remote interface operation:
OUTPut {ON|OFF}
The outputs are disabled when the “OFF” parameter is selected and enabled when the
“ON” is selected.
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.
45
Chapter 3 Front-Panel Operation
System-Related Operations
System-Related Operations
This section gives information on topics such as self-test, error conditions, and frontpanel display control. This information is not directly related to setting up the power
supply but is an important part of operating the power supply.
Self-Test
A power-on self-test occurs automatically when you turn on the power supply. This
test assures you that the power supply is operational. This test does not perform the
extensive set of tests that are included as part of the complete self-test described below.
If the power-on self-test fails, the ERROR annunciator turns on.
• A complete self-test performs a series of tests and takes approximately 2 seconds to
execute. If all tests pass, you can have a high confidence that the power supply is
operational.
• If the complete self-test is successful, “PASS” is displayed on the front panel. If the
self-test fails, “FAIL” is displayed and the ERROR annunciator turns on. See the
Service Guide for instructions on returning the power supply to Agilent Technologies
for service.
• Front-panel operation:
The complete self-test is enabled by pressing the Recall key (actually any front panel
keys except the Error key) and the power-line switch simultaneously and then
continuing to press the Recall key for 5 seconds. The complete self-test will be
finished in 2 more seconds.
• Remote interface operation:
*TST?
Returns “0” if the complete self-test passes or “1” if it fails.
46
Chapter 3 Front-Panel Operation
System-Related Operations
Error Conditions
When the front-panel ERROR annunciator turns on, one or more command syntax
or hardware errors have been detected. A record of up to 20 errors can be stored in
the power supply's error queue. See chapter 5 “Error Messages”, starting on page
115 for a complete listing of the errors.
• Errors are retrieved in first-in-first-out (FIFO) order. The first error returned is the
first error that was stored. When you have read all errors from the queue, the
ERROR annunciator turns off. The power supply beeps once each time an error
is generated.
• If more than 20 errors have occurred when you operate the power supply over the
remote interface, the last error stored in the queue (the most recent error) is replaced
with -350, “Queue overflow”. No additional errors are stored until you remove
errors from the queue. If no errors have occurred when you read the error queue, the
power supply responds with +0, “No error” over the remote interface or “NO
ERRORS” from the front panel.
• The error queue is cleared when power has been off or after a *CLS (clear status)
command has been executed. The *RST (reset) command does not clear the error
queue.
• Front-panel operation:
If the ERROR annunciator is on, press the Error key repeatedly to read the errors
stored in the queue. All errors are cleared when you read all errors.
ERROR
-113
• Remote interface operation:
SYSTem:ERRor?
Reads one error from the error queue
Errors have the following format (the error string may contain up to 80 characters).
-113,"Undefined header"
47
3
Chapter 3 Front-Panel Operation
System-Related Operations
Display Control
For security reasons, you may want to turn off the front-panel display. From the remote
interface, you can display a 12-character message on the front panel.
The display can be enabled / disabled from the remote interface only.
• When the display is turned off, outputs are not sent to the display and all annunciators
are disabled except the ERROR annunciator. Front-panel operation is otherwise
unaffected by turning off the display.
• The display state is stored in volatile memory; the display is always enabled when
power has been off, after a remote interface reset, or after returning to local from
remote.
• You can display a message on the front panel by sending a command from the remote
interface. The power supply can display up to 12 characters of the message on the
front panel; any additional characters are truncated. Commas, periods, and semicolons
share a display space with the preceding character, and are not considered individual
characters. When a message is displayed, outputs are not sent to the display.
• Sending a message to the display from the remote interface overrides the display state;
this means that you can display a message even if the display is turned off.
The display state is automatically turned on when you return to the local (front panel)
operation. Press the Local key to return to the local state from the remote interface
• Remote interface operation:
DISPlay {OFF|ON}
DISPlay:TEXT <quoted string>
DISPlay:TEXT:CLEar
Disable / enable the display
Display the string enclosed in quotes
Clear the displayed message
The following statement shows how to display a message on the front panel from a
Agilent Technologies controller.
"DISP:TEXT ’HELLO’"
48
Chapter 3 Front-Panel Operation
System-Related Operations
Firmware Revision Query
The power supply has three microprocessors for control of various internal systems.
You can query the power supply to determine which revision of firmware is installed
for each microprocessor.
You can query the firmware revision from the remote interface only.
• The power supply returns four fields separated by commas and the fourth field is
a revision code which contains three numbers. The first number is the firmware
revision number for the main processor; the second is for the input/output
processor; and the third is for the front-panel processor.
3
• Remote interface operation
*IDN?
Returns
“HEWLETT-PACKARD,E3631A,0,X.X-X.X-X.X”
Be sure to dimension a string variable with at least 40 characters.
SCPI Language Version
The power supply complies with the rules and regulations of the present version of
SCPI (Standard Commands for Programmable Instruments). You can determine the
SCPI version with which the power supply is in compliance by sending a command
from the remote interface.
You can query the SCPI version from the remote interface only.
• Remote interface operation:
SYSTem:VERSion?
Returns a string in the form “YYYY.V” where the “Y’s” represent the year of the
version, and the “V” represents a version number for that year (for example, 1995.0).
49
Chapter 3 Front-Panel Operation
Remote Interface Configuration
Remote Interface Configuration
Before you can operate the power supply over the remote interface, you must
configure the power supply for the remote interface. This section gives information
on configuring the remote interface. For additional information on programming the
power supply over the remote interface, See chapter 4 “Remote Interface Reference”,
starting on page 65.
Remote Interface Selection
The power supply is shipped with both an GPIB (IEEE-488) interface and an RS-232
interface on the rear panel. Only one interface can be enabled at a time. The GPIB
interface is selected when the power supply is shipped from the factory.
The remote interface can be selected from the front-panel only.
• The interface selection is stored in non-volatile memory, and does not change when
power has been off or after a remote interface reset.
• If you select the GPIB interface, you must select a unique address for the power
supply. The current address is displayed momentarily on the front panel when you
turn on the power supply.1
• Your GPIB bus controller has its own address. Be sure to avoid using the bus
controller’s address for any instrument on the interface bus. Agilent Technologies
controllers generally use address “21”.
• If you enable the RS-232 interface, you must select the baud rate and parity to be
used. “RS-232” is displayed momentarily on the front panel when you turn on the
power supply if you have selected this interface.2
1
Refer to "GPIB Interface Configuration" starting on page 55 for more information on
connecting the power supply to a computer over the GPIB interface.
2Refer to "RS-232 Interface Configuration" starting on page 56 for more information on
connecting the power supply to a computer over the RS-232 interface.
50
Chapter 3 Front-Panel Operation
Remote Interface Configuration
GPIB Address
Each device on the GPIB (IEEE-488) interface must have a unique address. You can
set the power supply’s address to any value between 0 and 30. The current address is
displayed momentarily on the front panel when you turn on the power supply. The
address is set to “05” when the power supply is shipped from the factory.
The GPIB address can be set from the front-panel only.
• The address is stored in non-volatile memory, and does not change when power
has been off or after a remote interface reset.
• Your GPIB bus controller has its own address. Be sure to avoid the bus
controller’s address for any instrument on the interface bus. Agilent
Technologies controllers generally use address “21”.
3
Baud Rate Selection (RS-232)
You can select one of six baud rates for RS-232 operation. The rate is set to 9600 baud
when the power supply is shipped from the factory.
The baud rate can be set from the front-panel only.
• Select one of the following: 300, 600, 1200, 2400, 4800, 9600 baud. The factory
setting is 9600 baud.
• The baud rate selection is stored in non-volatile memory, and does not change
when power has been off or after a remote interface reset.
Parity Selection (RS-232)
You can select the parity for RS-232 operation. The power supply is configured for
no parity and 8 data bits when shipped from the factory.
The parity can be set from the front-panel only.
• Select one of the following: None (8 data bits), Even (7 data bits), or Odd (7 data
bits). When you set the parity, you are indirectly setting the number of data bits.
• The parity selection is stored in non-volatile memory, and does not
change when power has been off or after a remote interface reset.
51
Chapter 3 Front-Panel Operation
Remote Interface Configuration
To Set the GPIB Address
To configure the power supply for the GPIB interface, proceed as follows:
I/O Config
1 Turn on the remote configuration mode.
HPIB / 488
You will see the above message on the front-panel display if the power supply has not
been changed from the default setting. If “RS-232” appears, choose “HPIB / 488” by
turning the knob to the right.
I/O Config
2 Select the GPIB address.
ADDR
05
The address is set to “05” when the power supply is shipped from the factory. Notice
that a different GPIB address may appear if the power supply has been changed from
the default setting.
3 Turn the knob to change the GPIB address.
The displayed address is changed when turning the knob to the right or left.
I/O Config
4 Save the change and turn off the I/O configuration mode.
CHANGE SAVED
The address is stored in non-volatile memory, and does not change when power has
been off or after a remote interface reset. The power supply displays a message to
show that the change is now in effect. If the GPIB address is not changed, “NO
CHANGE” will be displayed for one second.
Note
To cancel the I/O configuration mode without any changes during the GPIB address
selection, press the “I/O Config” key until the “NO CHANGE” message is displayed.
52
Chapter 3 Front-Panel Operation
Remote Interface Configuration
To Set the Baud Rate and Parity (RS-232)
To configure the power supply for the RS-232 interface, proceed as follows:
I/O Config
1 Turn on the remote configuration mode.
HPIB / 488
You will see the above message on the display if the power supply has not been
changed from the default setting.
Notice that if you changed the remote interface selection to RS-232 before, “RS232” message will be displayed.
3
2 Choose the RS-232 interface.
RS-232
You can choose the RS-232 interface by turning the knob to the left.
I/O Config
3 Select the RS-232 interface and choose the baud rate.
9600
BAUD
The rate is set to 9600 baud when the power supply is shipped from the factory. Choose
from one of the following by turning the knob to the right or left: 300, 600, 1200,
2400, 4800, or 9600 baud.
I/O Config
4 Save the change and choose the parity.
NONE
8
BITS
The power supply is configured for 8 data bits with no parity when shipped from the
factory. Choose from one of the following by turning the knob to the right or left:
None 8 Bits, Odd 7 Bits, or Even 7 Bits. When you set parity, you are indirectly setting
the number of the data bits.
53
Chapter 3 Front-Panel Operation
Remote Interface Configuration
I/O Config
5 Save the change and turn off the I/O configuration mode.
CHANGE SAVED
The RS-232 baud rate and parity selections are stored in non-volatile memory, and
does not change when power has been off or after a remote interface reset. The power
supply displays a message to show that the change is now in effect. If the baud rate
and the parity are not changed, “NO CHANGE” will be displayed for one second.
Note
To cancel the I/O configuration mode without any changes during the baud rate and
parity selection, press the “I/O Config” key until the “NO CHANGE” message is
displayed.
54
Chapter 3 Front-Panel Operation
GPIB Interface Configuration
GPIB Interface Configuration
The GPIB connector on the rear panel connects your power supply to the computer
and other GPIB devices. Chapter 1 lists the cables that are available from Agilent
Technologies. An GPIB system can be connected together in any configuration (star,
linear, or both) as long as the following rules are observed:
• The total number of devices including the computer is no more than 15.
• The total length of all the cables used is no more than 2 meter times the number
of devices connected together, up to a maximum of 20 meters.
Note
3
IEEE-488 states that you should exercise caution if your individual cable lengths
exceed 4 meters
Do not stack more than three connector blocks together on any GPIB connector. Make
sure that all connectors are fully seated and that the lock screws are firmly finger
tightened.
55
Chapter 3 Front-Panel Operation
RS-232 Interface Configuration
RS-232 Interface Configuration
You connect the power supply to the RS-232 interface using the 9-pin (DB-9) serial
connector on the rear panel. The power supply is configured as a DTE (Data Terminal
Equipment) device. For all communications over the RS-232 interface, the power
supply uses two handshake lines: DTR (Data Terminal Ready, on pin 4) and DSR
(Data Set Ready, on pin 6).
The following sections contain information to help you use the power supply over the
RS-232 interface. The programming commands for RS-232 are explained on page 89.
RS-232 Configuration Overview
Configure the RS-232 interface using the parameters shown below. Use the frontpanel I/O Config key to select the baud rate, parity, and number of data bits (see
page 53 for more information to configure from the front panel).
• Baud Rate: 300, 600, 1200, 2400, 4800, or 9600 baud (factory setting)
• Parity and Data Bits:
None / 8 data bits (factory setting)
Even / 7 data bits, or
Odd / 7 data bits
• Number of Start Bits:
1 bit (fixed)
• Number of Stop Bits:
2 bits (fixed)
RS-232 Data Frame Format
A character frame consists of all the transmitted bits that make up a single character.
The frame is defined as the characters from the start bit to the last stop bit, inclusively.
Within the frame, you can select the baud rate, number of data bits, and parity type.
The power supply uses the following frame formats for seven and eight data bits.
56
Chapter 3 Front-Panel Operation
RS-232 Interface Configuration
Connection to a Computer or Terminal
To connect the power supply to a computer or terminal, you must have the proper
interface cable. Most computers and terminals are DTE (Data Terminal Equipment)
devices. Since the power supply is also a DTE device, you must use a DTE-to-DTE
interface cable. These cables are also called null-modem, modem-eliminator, or
crossover cables.
The interface cable must also have the proper connector on each end and the internal
wiring must be correct. Connectors typically have 9 pins (DB-9 connector) or 25
pins (DB-25 connector) with a “male” or “female” pin configuration. A male
connector has pins inside the connector shell and a female connector has holes
inside the connector shell.
3
If you cannot find the correct cable for your configuration, you may have to use a
wiring adapter. If you are using a DTE-to-DTE cable, make sure the adapter is a
“straight-through” type. Typical adapters include gender changers, null-modem
adapters, and DB-9 to DB-25 adapters.
The cable and adapter diagrams shown below can be used to connect the power supply
to most computers or terminals. If your configuration is different than those described,
order the Agilent 34399A, 34399A Adapter Kit. This kit contains adapters for
connection to other computers, terminals, and modems. Instructions and pin diagrams
are included with the adapter kit.
DB-9 Serial Connection If your computer or terminal has a 9-pin serial port with a
male connector, use the null-modem cable included with the Agilent 34398A Cable
Kit. This cable has a 9-pin female connector on each end. The cable pin diagram is
shown below.
5182-4794
Cable
Instrument
PC
DCD
RX
TX
DTR
1
2
3
4
1
2
3
4
DCD
RX
TX
DTR
GND
DSR
RTS
CTS
RI
5
6
7
8
9
5
6
7
8
9
GND
DSR
RTS
CTS
RI
DB9
Male
DB9
Female
DB9
Female
DB9
Male
57
Chapter 3 Front-Panel Operation
RS-232 Interface Configuration
DB-25 Serial Connection If your computer or terminal has a 25-pin serial port with
a male connector, use the null-modem cable and 25-pin adapter included with the
Agilent 34398A Cable Kit. The cable and adapter pin diagram are shown below.
DCD
RX
TX
DTR
GND
DSR
RTS
CTS
RI
DB9
Male
5181-6641
Adapter
5182-4794
Cable
Instrument
1
2
3
4
5
6
7
8
9
DB9
Female
1
2
3
4
5
6
7
8
9
PC
2
3
4
5
1
2
3
4
5
6
7
8
9
DB9
DB9
Female Male
6
7
8
20
TX
RX
RTS
CTS
DSR
GND
DCD
DTR
DB25 DB25
Female Male
DTR/DSR Handshake Protocol
The power supply is configured as a DTE (Data Terminal Equipment) device and uses
the DTR (Data Terminal Ready) and DSR (Data Set Ready) lines of the RS-232
interface to handshake. The power supply uses the DTR line to send a hold-off signal.
The DTR line must be TRUE before the power supply will accept data from the
interface. When the power supply sets the DTR line FALSE, the data must cease
within 10 characters.
To disable the DTR/DSR handshake, do not connect the DTR line and tie the DSR
line to logic TRUE. If you disable the DTR/DSR handshake, also select a slower baud
rate to ensure that the data is transmitted correctly.
The power supply sets the DTR line FALSE in the following cases:
1 When the power supply’s input buffer is full (when approximately 100 characters
have been received), it sets the DTR line FALSE (pin 4 on the RS-232 connector).
When enough characters have been removed to make space in the input buffer, the
power supply sets the DTR line TRUE, unless the second case (see next) prevents this.
58
Chapter 3 Front-Panel Operation
RS-232 Interface Configuration
2 When the power supply wants to “talk” over the interface (which means that it has
processed a query) and has received a <new line> message terminator, it will set the
DTR line FALSE. This implies that once a query has been sent to the power supply,
the bus controller should read the response before attempting to send more data. It
also means that a <new line> must terminate the command string. After the response
has been output, the power supply sets the DTR line TRUE again, unless the first case
(see above) prevents this.
The power supply monitors the DSR line to determine when the bus controller is
ready to accept data over the interface. The power supply monitors the DSR line
(pin 6 on the RS-232 connector) before each character is sent. The output is
suspended if the DSR line is FALSE. When the DSR line goes TRUE, transmission
will resume.
The power supply holds the DTR line FALSE while output is suspended. A form
of interface deadlock exists until the bus controller asserts the DSR line TRUE to
allow the power supply to complete the transmission. You can break the interface
deadlock by sending the <Ctrl-C> character, which clears the operation in progress
and discards pending output (this is equivalent to the IEEE-488 device clear action).
For the <Ctrl-C> character to be recognized reliably by the power supply while it
holds DTR FALSE, the bus controller must first set DSR FALSE.
RS-232 Troubleshooting
Here are a few things to check if you are having problems communicating over the
RS-232 interface. If you need additional help, refer to the documentation that came
with your computer.
• Verify that the power supply and your computer are configured for the same baud
rate, parity, and number of data bits. Make sure that your computer is set up for 1
start bit and 2 stop bits (these values are fixed on the power supply).
• Make sure to execute the SYSTem:REMote command to place the power supply
in the remote mode.
• Verify that you have connected the correct interface cable and adapters. Even if
the cable has the proper connectors for your system, the internal wiring may be
incorrect. The Agilent 34398A Cable Kit can be used to connect the power supply
to most computers or terminals.
• Verify that you have connected the interface cable to the correct serial port on your
computer (COM1, COM2, etc.).
59
3
Chapter 3 Front-Panel Operation
Calibration Overview
Calibration Overview
This section gives an overview of the calibration features of the power supply. For
more detailed discussion of the calibration procedures, see the Service Guide.
Calibration Security
This feature allows you to enter a security code to prevent accidental or unauthorized
calibrations of the power supply. When you first receive your power supply, it is
secured. Before you can calibrate the power supply, you must unsecure it by entering
the correct security code.
• The security code is set to “HP003631” when the power supply is shipped from
the factory. The security code is stored in non-volatile memory, and does not
change when power has been off or after a remote interface reset.
• To secure the power supply from the remote interface, the security code may
contain up to 12 alphanumeric characters as shown below. The first character must
be a letter, but the remaining characters can be letters or numbers. You do not have
to use all 12 characters but the first character must always be a letter.
A _ _ _ _ _ _ _ _ _ _ _ (12 characters)
• To secure the power supply from the remote interface so that it can be unsecured
from the front panel, use the eight-character format shown below. The first two
characters must be “H P” and the remaining characters must be numbers. Only the
last six characters are recognized from the front panel, but all eight characters are
required. To unsecure the power supply from the front panel, omit the “H P” and
enter the remaining numbers as shown on the following
HP _ _ _ _ _ _
(8 characters)
If you forget your security code, you can disable the security feature by adding a
jumper inside the power supply, and then entering a new code. See the Service
Guide for more information.
60
Chapter 3 Front-Panel Operation
Calibration Overview
To Unsecure for Calibration You can unsecure the power supply for calibration either
from the front panel or over the remote interface. The power supply is secured when
shipped from the factory, and the security code is set to “HP003631”.
• Front-Panel Operation
SECURED
If the power supply is secured, you will see the above message for one second by
holding the Calibrate key for 5 seconds when you turn on the power supply. To
unsecure the power supply, press the Secure key after the “CAL MODE” message
is displayed in the calibration mode, enter the security code using the knob and
resolution selection keys, and then press the Secure key.
3
000000 CODE
When you press the Secure key to save the change, you will see the message below
for one second if the security code is correct. The unsecured setting is stored in nonvolatile memory, and does not change when power has been off or after a remote
interface reset. To exit the calibration mode, turn the power off and on.
Notice that if the security is incorrect, the power supply returns to the code entering
mode for you to enter the correct code.
UNSECURED
• Remote Interface Operation:
CALibrate:SECure:STATe, {OFF|ON},<code>
To unsecure the power supply, send the above command with the same code used to
secure. For example,
"CAL:SEC:STAT OFF, HP003631"
61
Chapter 3 Front-Panel Operation
Calibration Overview
To Secure Against Calibration You can secure the power supply against calibration
either from the front panel or over the remote interface. The power supply is secured
when shipped from the factory, and the security code is set to “HP003631”.
Be sure to read the security code rules on page 60 before attempting to secure the
power supply.
• Front-Panel Operation:
UNSECURED
If the power supply is unsecured, you will see the above message for one second by
holding the Calibrate key for 5 seconds when you turn on the power supply. To
secure the power supply, press the Secure key after the “CAL MODE” message is
displayed in the calibration mode, enter the security code using the knob and
resolution selection keys, and then press Secure key.
Notice that you should omit the “H P” and enter the remaining numbers as shown
below.
000000 CODE
When you press the Secure key to save the change, you will see the message below.
The secured setting is stored in non-volatile memory, and does not change when power
has been off or after a remote interface reset. To exit the calibration mode, turn the
power off and on.
SECURED
• Remote Interface Operation:
CALibrate:SECure:STATe {OFF|ON},<code>
To secure the power supply, send the above command with the same code as used to
unsecure. For example,
"CAL:SEC:STAT ON, HP003631"
62
Chapter 3 Front-Panel Operation
Calibration Overview
To Change the Security Code To change the security code, you must first unsecure
the power supply, and then enter a new code.
Be sure to read the security code rules on page 60 before attempting to secure the
power supply.
• Front-Panel Operation:
To change the security code, first make sure that the power supply is unsecured.
Press the Secure key after the “CAL MODE” message is displayed in the
calibration mode, enter the new security code using the knob and resolution
selection keys, then press the Secure key.
3
Changing the code from the front panel also changes the code required from the
remote interface.
• Remote Interface Operation:
CALibrate:SECure:CODE <new code>
To change the security code, first unsecure the power supply using the old security
code. Then, enter the new code. For example,
"CAL:SEC:STAT OFF, HP003631"
Unsecure with old code
"CAL:SEC:CODE ZZ001443"
Enter new code
"CAL:SEC:STAT ON, ZZ00143"
Secure with new code
63
Chapter 3 Front-Panel Operation
Calibration Overview
Calibration Count
You can determine the number of times that your power supply has been calibrated.
Your power supply was calibrated before it left the factory. When you receive your
power supply, read the count to determine its initial value.
The calibration count feature can be performed from the remote interface only.
• The calibration count is stored in non-volatile memory, and does not change when
power has been off or after a remote interface reset.
• The calibration count increments up to a maximum of 32,767 after which it wrapsaround to 0. Since the value increments by one for each calibration point, a
complete calibration will increase the value by 6 counts.
• Remote Interface Operation:
CALibrate:COUNt?
Calibration Message
You can use the calibration message feature to record calibration information about
your power supply. For example, you can store such information as the last calibration
date, the next calibration due date, the power supply's serial number, or even the name
and phone number of the person to contact for a new calibration.
You can record and read information in the calibration message from the remote
interface only.
• The power supply should be unsecured before sending a calibration message.
• The calibration message may contain up to 40 characters.
• The calibration message is stored in non-volatile memory, and does not change
when power has been off or after a remote interface reset.
• Remote Interface Operation:
CALibrate:STRing <quoted string>
Store the cal message
The following command string shows how to store a calibration message.
"CAL:STR 'CAL 05-1-95'"
64
4
4
Remote Interface Reference
Remote Interface Reference
Î
•
SCPI Command Summary, page 65
•
Simplified Programming Overview, page 70
• Using the APPLy Command, page 73
• Output Setting and Operation Commands, page 74
• Triggering Commands, page 79
• System-Related Commands, page 82
• Calibration Commands, page 85
• RS-232 Interface Commands, page 87
• The SCPI Status Registers, page 88
• Status Reporting Commands, page 98
Î
• An Introduction to the SCPI Language, page 102
• Halting an Output in Progress, page 107
• SCPI Conformance Information, page 108
• IEEE-488 Conformance Information, page 111
If you are a first-time user of the SCPI language, you may want to refer to these
sections to become familiar with the language before attempting to program the power
supply.
66
Chapter 4 Remote Interface Reference
SCPI Command Summary
SCPI Command Summary
This section summarizes the SCPI (Standard Commands for Programmable
Instruments) commands available to program the power supply over the remote
interface. Refer to the later sections in this chapter for more complete details on each
command.
Throughout this manual, the following conventions are used for SCPI command
syntax.
• Square brackets ([ ]) indicate optional keywords or parameters.
• Braces ({ }) enclose parameters within a command string.
• Triangle brackets (< >) indicate that you must substitute a value or a code for
the enclosed parameter.
• A vertical bar ( | ) separates one of two or more alternative parameters.
4
First-time SCPI users, see page 104
67
Chapter 4 Remote Interface Reference
SCPI Command Summary
Output Setting and Operation Commands
APPLy
{P6V|P25V|N25V}[,{<voltage>|DEF|MIN|MAX}[,{<current>|DEF|MIN|MAX}]]
APPLy? [{P6V|P25V|N25V}]
INSTrument
[:SELect] {P6V|P25V|N25V}
[:SELect]?
:NSELect {1|2|3}
:NSELect?
:COUPle[:TRIGger] {ALL|NONE|<list>}
:COUPle[:TRIGger]?
MEASure
:CURRent[:DC]? [{P6V|P25V|N25V}]
[:VOLTage][:DC]? [{P6V|P25V|N25V}]
OUTPut
[:STATe] {OFF|ON}
[:STATe]?
:TRACk[:STATe] {OFF|ON}
:TRACk[:STATe]?
[SOURce:]
CURRent[:LEVel][:IMMediate][:AMPLitude] {<current>[MIN|MAX}
CURRent[:LEVel][:IMMediate][:AMPLitude]?[MIN|MAX]
CURRent[:LEVel]:TRIGgered[:AMPLitude]
{<current>[MIN|MAX}
CURRent[:LEVel]:TRIGgered[:AMPLitude]? [MIN|MAX]
VOLTage[:LEVel][:IMMediate][:AMPLitude] {<voltage>|MIN|MAX}
VOLTage[:LEVel][:IMMediate][:AMPLitude]?[MIN|MAX]
VOLTage[:LEVel]:TRIGgered[:AMPLitude]
{<voltage>[MIN|MAX}
VOLTage[:LEVel]:TRIGgered[:AMPLitude]? [MIN|MAX]
Triggering Commands
INITiate [:IMMediate]
TRIGger[:SEQuence]
:DELay {<seconds>|MIN|MAX}
:DELay?
:SOURce {BUS|IMM}
:SOURce?
*TRG
68
Chapter 4 Remote Interface Reference
SCPI Command Summary
System-Related Commands
DISPlay[:WINDow]
[:STATe] {OFF|ON}
[:STATe]?
:TEXT[:DATA] <quoted string>
:TEXT[:DATA]?
:TEXT:CLEar
SYSTem
:BEEPer[:IMMediate]
:ERRor?
:VERSion?
*IDN?
*RST
4
*TST?
*SAV {1|2|3}
*RCL {1|2|3}
Calibration Commands
CALibration
:COUNt?
:CURRent[:DATA] <numeric value>
:CURRent:LEVel {MIN|MAX}
:SECure:CODE <new code>
:SECure:STATe {OFF|ON}, <code>
:SECure:STATe?
:STRing <quoted string>
:STRing?
:VOLTage[:DATA] <numeric value>
:VOLTage:LEVel {MIN|MAX}
69
Chapter 4 Remote Interface Reference
SCPI Command Summary
Status Reporting Commands
STATus:QUEStionable
[:EVENt]?
:ENABle <enable value>
:ENABle?
:INSTrument[:EVENt]?
:INSTrument:ENABle <enable value>
:INSTrument:ENABle?
:INSTrument:ISUMmary<n>[:EVENt]?
:INSTrument:ISUMmary<n>:CONDition?
:INSTrument:ISUMmary<n>:ENABle <enable value>
:INSTrument:ISUMmary<n>:ENABle?
SYSTem:ERRor?
*CLS
*ESE <enable value>
*ESE?
*ESR?
*OPC
*OPC?
*PSC {0|1}
*PSC?
*SRE <enable value>
*SRE?
*STB?
*WAI
RS-232 Interface Commands
SYSTem
:LOCal
:REMote
:RWLock
70
Chapter 4 Remote Interface Reference
SCPI Command Summary
IEEE-488.2 Common Commands
*CLS
*ESE <enable value>
*ESE?
*ESR?
*IDN?
*OPC
*OPC?
*PSC {0|1}
*PSC?
*RST
*SAV {1|2|3}
4
*RCL {1|2|3}
*SRE <enable value>
*SRE?
*STB?
*TRG
*TST?
*WAI
71
Chapter 4 Remote Interface Reference
Simplified Programming Overview
Simplified Programming Overview
First-time
SCPI users,
see page 104
This section gives an overview of the basic techniques used to program the power
supply over the remote interface. This section is only an overview and does not give
all of the details you will need to write your own application programs. Refer to the
remainder of this chapter and also chapter 6, Application Programs, for more details
and examples. Also refer to the programming reference manual that came with your
computer for details on outputting command strings and entering data.
Using the APPLy Command
The APPLy command provides the most straightforward method to program the
power supply over the remote interface. For example, the following statement
executed from your computer will set the +6V supply to an output of 3 V rated at 1 A:
"APPL P6V, 3.0, 1.0"
Using the Low-Level Commands
Although the APPLy command provides the most straightforward method to program
the power supply, the low-level commands give you more flexibility to change
individual parameters. For example, the following statements executed from your
computer will set the +6V supply to an output of 3 V rated at 1 A:
72
"INST P6V"
Select +6V output
"VOLT 3.0"
Set output voltage to 3.0 V
"CURR 1.0"
Set output current to 1.0 A
Chapter 4 Remote Interface Reference
Simplified Programming Overview
Reading a Query Response
Only the query commands (commands that end with “?”) will instruct the power
supply to send a response message. Queries return either output values or internal
instrument settings. For example, the following statements executed from your
computer will read the power supply's error queue and print the most recent error:
dimension statement
Dimension string array (80 elements)
"SYST:ERR?"
Read error queue
bus enter statement
Enter error string into computer
print statement
Print error string
Selecting a Trigger Source
The power supply will accept a “bus” (software) trigger or an immediate internal
trigger as a trigger source. By default, the “BUS” trigger source is selected. If you
want the power supply to use an immediate internal trigger, you must select
“IMMediate”. For example, the following statements executed from your
computer will set the +6V supply to an output of 3 V/1 A immediately:
"INST P6V"
Select the +6V output
"VOLT:TRIG 3.0"
Set the triggered voltage level to 3.0 V
"CURR:TRIG 1.0"
Set the triggered current level to 1.0 A
"TRIG:SOUR IMM"
Select the immediate trigger as a source
"INIT"
Cause the trigger system to initiate
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Programming Ranges and Output Identifiers
Output setting commands require a parameter for programming ranges and an output
name or an output number as the identifier of each output and most queries will return
a parameter. The programming range for a parameter varies according to the selected
output of the power supply. The following table lists the programming ranges, output
names, and output numbers for each output.
Refer to this table to identify parameters when programming the power supply.
Table 4-1. Agilent E3631A Programming Ranges and Output Identifiers
Output
+6V output
Voltage
Programming
Range
-25V output
0 to 6.18 V
0 to +25.75 V
0 to -25.75 V
MAX value
6.18 V
25.75 V
-25.75 V
MIN value
0V
0V
0V
0V
0V
0V
0 to 5.15 A
0 to 1.03 A
0 to 1.03 A
MAX value
5.15 A
1.03 A
1.03 A
MIN value
0A
0A
0A
*RST value
(DEFault value)
5A
1A
1A
Output identifier
P6V
P25V
N25V
Output number
1
2
3
*RST value
(DEFault value)
Current
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+25V output
Programming
Range
Chapter 4 Remote Interface Reference
Using the APPLy Command
Using the APPLy Command
The APPLy command provides the most straightforward method to program the
power supply over the remote interface. You can select the specific output, output
voltage, and output current all in one command.
APPLy
{P6V|P25V|N25V}[,{<voltage>| DEF|MIN|MAX}[,{<current>|DEF|MIN|MAX}]]
This command is combination of INSTrument:SELect, [SOURce:] VOLTage,
and [SOURce:]CURRent commands. The values of voltage and the current of the
specified output are changed as soon as the command is executed.
You can identify each output by the output name (P6V, P25V or N25V) as described
in Table 4-1. For the voltage and current parameters of the APPLy command, the
ranges depend on the output currently selected. You can substitute “MINimum”,
“MAXimum”, or “DEFault” in place of a specific value for the voltage and current
parameters. MIN selects the lowest voltage and current values allowed for the
selected output. MAX selects the highest voltage and current values allowed. The
default voltage values are 0 volts for all outputs. The default current values are 5
A for +6V output and 1 A for ±25V outputs. The default voltage and current values
are exactly the same as the *RST values. See Table 4-1 for details of parameters.
If you specify only one value for the parameter, the power supply regards it as voltage
setting value. If you do not specify any value for the parameter, the APPLy command
only selects the output specified and acts as the INSTrument command.
APPLy? [{P6V|P25V|N25V}]
This command queries the power supply's present voltage and current values for each
output and returns a quoted string. The voltage and current are returned in sequence
as shown in the sample string below (the quotation marks are returned as part of the
string). If any output identifier is not specified, the voltage and the current of the
currently selected output are returned.
"5.000000,1.000000"
In the above string, the first number 5.000000 is the voltage limit value and the second
number 1.000000 is the current limit value for the specified output.
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Output Setting and Operation Commands
Output Setting and Operation Commands
This section describes the low-level commands used to program the power supply.
Although the APPLy command provides the most straightforward method to program
the power supply, the low-level commands give you more flexibility to change
individual parameters.
See page 74 for programming ranges, output identifiers, and MIN / MAX values in
the following commands.
Output Selection Commands
INSTrument[:SELect] {P6V|P25V|N25V}
This command selects the output to be programmed among three outputs by the output
identifier. The outputs of the power supply are considered three logical instruments.
The INSTrument command provides a mechanism to identify and select an output.
When one output is selected, the other outputs are unavailable for programming until
selected. The commands which are affected by the INSTrument command are
output setting commands (SOURce), measurement commands (MEASure), and
calibration commands (CALibration). “P6V” is the identifier for +6V output,
“P25V” is for +25V output and “N25V” is for -25V output.
INSTrument[:SELect]?
This query returns the currently selected output by the INSTrument [:SELect]
or INSTrument:NSELect command. The returned parameter is “P6V”, “P25V”,
or “N25V”.
INSTrument:NSELect {1|2|3}
This command selects the output to be programmed among three outputs by a numeric
value instead of the output identifier used in the INSTrument [:SELect]
command. “1” selects +6V output, “2” selects +25V output, and “3” selects -25V
output.
INSTrument:NSELect?
This query returns the currently selected output by the INSTrument:NSELect or
INSTrument[:SELect] command. The returned parameter is “1” for +6V output,
“2” for +25V output or “3” for -25V output.
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INSTrument:COUPle[:TRIGger] {ALL|NONE |<list>}
This command defines a coupling between various logical outputs of the power
supply. The couple command consists of an optional subsystem node followed by a
single parameter. The only valid parameter for the optional subsystem node is
TRIGger subsystem. If no node follows the couple command, TRIGger subsystem
is assumed to be coupled.
The parameter indicates to which logical outputs the specified coupling is to apply.
“ALL” indicates that specified coupling is to apply to all outputs. “NONE” indicates
that specified coupling is to be removed. A list of outputs specifies a particular set of
logical outputs to be coupled. At *RST, all outputs are uncoupled. Notice that TRACk
must be off before the ±25V supplies can be coupled.
INST:COUP
Example (1)
The following program segment shows how to use the INSTrument:COUPle
command to couple two outputs between the +6V and the +25V outputs with
voltage and current triggered levels. The power supply is set to the newly
programmed values as set by the VOLTage:TRIGgered and
CURRent:TRIGgered commands.
"INST:SEL P6V"
"VOLT:TRIG 5"
"CURR:TRIG 3"
"INST:SEL P25V"
"VOLT:TRIG 20"
"CURR:TRIG 0.5"
"INST:COUP P6V,P25V"
"TRIG:SOUR IMM"
"INIT"
Note
4
Select the +6V output
Set triggered level to 5 V
Set triggered level to 3 A
Select the +25V output
Set triggered level to 20 V
Set triggered level to 0.5 A
Couple the +6V and +25V supply
Set trigger to immediate
Trigger the power supply to output
the trigger values for
the +6V and the +25V supplies
If you select the bus trigger source in the above program (see page 81 for the detailed
information), you must send the *TRG or Group Execute Trigger (GET) command to
start the trigger action after sending the INITiate command.
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INSTrument:COUPle[:TRIGger]?
This query returns the currently coupled output. Returns “ALL”, “NONE”, or a list.
If any output is not coupled, “NONE” is returned. If all of three outputs are coupled,
“ALL” is returned. If a list of outputs is coupled, the list is returned.
Measurement Commands
MEASure:CURRent[:DC]? [{P6V|P25V|N25V}]
This command queries the current measured at the output terminals of the power
supply. The physical outputs of measurement are specified by the output identifier. If
any output identifier is not specified, the current of the currently selected output is
returned.
MEASure[:VOLTage][:DC]? [{P6V|P25V|N25V}]
This command queries the voltage measured at the output terminals of the power
supply. If any output identifier is not specified, the voltage of the currently selected
output is returned.
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Output On/Off and Tracking Operation Commands
OUTPut[:STATe] {OFF|ON}
This command enables or disables all three outputs of the power supply. The state of
the disabled outputs is a condition of less than 0.6 volts of opposite polarity with no
load and less than 60 mA of opposite direction with a short circuit. At *RST, the
output state is off.
OUTPut[:STATe]?
This command queries the output state of the power supply. The returned value is
“0” (OFF) or “1” (ON).
OUTPut:TRACk[:STATe] {OFF|ON}
This command enables or disables the power supply to operate in the track mode.
When the track mode is first enabled, the -25V supply will be set to the same
voltage level as the +25V supply. Once enabled, any change of the programmed
voltage level in either +25V supply or -25V supply will be reflected in the other
supply. The TRACk OFF command returns the power supply to the non-track
mode. The ±25V supplies must not be coupled to enable “Track”. At *RST, the
track mode is disabled.
4
OUTPut:TRACk[:STATe]?
This command queries the track mode state of the power supply. The returned value
is “0” (OFF) or “1” (ON).
Output Setting Commands
[SOURce:]CURRent[:LEVel][:IMMediate][:AMPLitude]
{<current>|MINimum|MAXimum}
This command directly programs the immediate current level of the power supply.
The immediate level is the current limit value of the output selected with the
INSTrument command.
[SOURce:]CURRent[:LEVel][:IMMediate][:AMPLitude]?
[MINimum|MAXimum]
This query returns the presently programmed current limit level of the selected output.
CURRent? MAXimum and CURRent? MINimum return the maximum and
minimum programmable current levels of the selected output.
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[SOURce:]CURRent[:LEVel]:TRIGgered[:AMPLitude]
{<current>| MINimum|MAXimum}
This command programs the pending triggered current level of the power supply. The
pending triggered current level is a stored value that is transferred to the output
terminals when a trigger occurs. A pending triggered level is not affected by
subsequent CURRent commands.
[SOURce:]CURRent[:LEVel]:TRIGgered[:AMPLitude]?
[MINimum|MAXimum]
This query returns the presently programmed triggered current level. If no triggered
level is programmed, the CURRent level is returned. CURRent :TRIGgered?
MAXimum and CURRent:TRIGgered? MINimum return the maximum and
minimum programmable triggered current levels.
VOLTage[:LEVel][:IMMediate][:AMPLitude]
{<voltage>| MINimum|MAXimum}
This command directly programs the immediate voltage level of the power supply.
The immediate level is the voltage limit value of the selected output with the
INSTrument command.
[SOURce:]VOLTage[:LEVel][:IMMediate][:AMPLitude]?
[MINimum|MAXimum]
This query returns the presently programmed voltage limit level of the selected output.
VOLTage? MAXimum and VOLTage? MINimum return the maximum and
minimum programmable voltage levels of the selected output.
[SOURce:]VOLTage[:LEVel]:TRIGgered[:AMPLitude]
{<voltage>| MINimum|MAXimum}
This command programs the pending triggered voltage level of the power supply. The
pending triggered voltage level is a stored value that is transferred to the output
terminals when a trigger occurs. A pending triggered level is not affected by
subsequent VOLTage commands.
[SOURce:]VOLTage[:LEVel]:TRIGgered[:AMPLitude]?
[MINimum|MAXimum]
This query returns the presently programmed triggered voltage level. If no triggered
level is programmed, the VOLTage level is returned. VOLTage:TRIGgered?
MAXimum and VOLTage:TRIGgered? MINimum return the maximum and
minimum programmable triggered voltage levels.
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Triggering Commands
Triggering Commands
The power supply's triggering system allows a change in voltage and current when
receiving a trigger, to select a trigger source, and to insert a trigger. Triggering the
power supply is a multi-step process.
• First, you must select an output with the INSTrument:SELect command and
then configure the power supply for the triggered output level by using
CURRent:TRIGgered and VOLTage:TRIGgered commands.
• Then, you must specify the source from which the power supply will accept the
trigger. The power supply will accept a bus (software) trigger or an immediate
trigger from the remote interface.
• Then, you can set the time delay between the detection of the trigger on the
specified trigger source and the start of any corresponding output change. Notice
that the time delay is valid for only the bus trigger source.
4
• Finally, you must provide an INITiate[:IMMediate]command. If the
IMMediate source is selected, the selected output is set to the triggered level
immediately. But if the trigger source is the bus, the power supply is set to the
triggered level after receiving the Group Execute Trigger (GET) or *TRG
command.
Trigger Source Choices
You must specify the source from which the power supply will accept a trigger. The
trigger is stored in volatile memory; the source is set to bus when the power supply
has been off or after a remote interface reset.
Bus (Software) Triggering
• To select the bus trigger source, send the following command.
TRIGger:SOURce BUS
• To trigger the power supply from the remote interface (GPIB or RS-232) after
selecting the bus source, send the *TRG (trigger) command. When the *TRG is
sent, the trigger action starts after the specified time delay if any delay is given.
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• You can also trigger the power supply from the GPIB interface by sending the
IEEE-488 Group Execute Trigger (GET) message. The following statement shows
how to send a GET from a Agilent Technologies controller.
TRIGGER 705 (group execute trigger)
• To ensure synchronization when the bus source is selected, send the *WAI (wait)
command. When the *WAI command is executed, the power supply waits for all
pending operations to complete before executing any additional commands. For
example, the following command string guarantees that the first trigger is accepted
and is executed before the second trigger is recognized.
TRIG:SOUR BUS;*TRG;*WAI;*TRG;*WAI
• You can use the *OPC? (operation complete query) command or the *OPC
(operation complete) command to signal when the operation is complete. The
*OPC? command returns “1” to the output buffer when the operation is complete.
The *OPC command sets the “OPC” bit (bit 0) in the Standard Event register when
the operation is complete.
Immediate Triggering
• To select the immediate trigger source, send the following command.
TRIGger:SOURce IMM
• When the IMMediate is selected as a trigger source, an INITiate command
immediately transfers the VOLTage:TRIGgered[:AMPLitude] and
CURRent:TRIGgered[:AMPLitude]values to
VOLTage[:LEVel][:IMMediate][:AMPLitude] and CURRent
[:LEVel][:IMMediate][:AMPLitude]values. Any delay is ignored.
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Triggering Commands
INITiate[:IMMediate]
This command causes the trigger system to initiate. This command completes one full
trigger cycle when the trigger source is an immediate and initiates the trigger
subsystem when the trigger source is bus.
TRIGger[:SEQuence]:DELay{<seconds>| MINimum|MAXimum}
This command sets the time delay between the detection of an event on the specified
trigger source and the start of any corresponding trigger action on the power supply
output. Select from 0 to 3600 seconds. MIN = 0 seconds. MAX = 3600 seconds. At
*RST , this value is set to 0 seconds.
TRIGger[:SEQuence]:DELay?
This command queries the trigger delay.
TRIGger[:SEQuence]:SOURce {BUS|IMMediate}
This command selects the source from which the power supply will accept a trigger.
The power supply will accept a bus (software) trigger or an internal immediate
trigger. At *RST, the bus trigger source is selected.
4
TRIGger[:SEQuence]:SOURce?
This command queries the present trigger source. Returns “BUS” or “IMM”.
*TRG
This command generates a trigger to the trigger subsystem that has selected a bus
(software) trigger as its source (TRIGger:SOURce BUS). The command has the
same effect as the Group Execute Trigger (GET) command. For RS-232 operation,
make sure the power supply is in the remote interface mode by sending the
SYSTem:REMote command first.
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System-Related Commands
System-Related Commands
DISPlay[:WINDow][:STATe] {OFF|ON}
This command turns the front-panel display off or on. When the display is turned off,
outputs are not sent to the display and all annunciators are disabled except the ERROR
annunciator.
The display state is automatically turned on when you return to the local mode. Press
the Local key to return to the local state from the remote interface.
DISPlay[:WINDow][:STATe]?
This command queries the front-panel display setting. Returns “0” (OFF) or “1” (ON).
DISPlay[:WINDow]:TEXT[:DATA] <quoted string>
This command displays a message on the front panel. The power supply will display
up to 12 characters in a message; any additional characters are truncated. Commas,
periods, and semicolons share a display space with the preceding character, and are
not considered individual characters.
DISPlay[:WINDow]:TEXT[:DATA]?
This command queries the message sent to the front panel and returns a quoted string.
DISPlay[:WINDow]:TEXT:CLEar
This command clears the message displayed on the front panel.
SYSTem:BEEPer[:IMMediate]
This command issues a single beep immediately.
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SYSTem:ERRor?
This command queries the power supply's error queue. When the front-panel ERROR
annunciator turns on, one or more command syntax or hardware errors have been
detected. Up to 20 errors can be stored in the error queue. See “Error Messages” in
chapter 5.
• Errors are retrieved in first-in-first-out (FIFO) order. The first error returned is the
first error that was stored. When you have read all errors from the queue, the
ERROR annunciator turns off. The power supply beeps once each time an error
is generated.
• If more than 20 errors have occurred, the last error stored in the queue (the most
recent error) is replaced with -350, “Queue overflow”. No additional errors are
stored until you remove errors from the queue. If no errors have occurred when
you read the error queue, the power supply responds with +0, “No error”.
• The error queue is cleared when power has been off or after a *CLS (clear status)
command has been executed. The *RST (reset) command does not clear the
error queue.
4
SYSTem:VERSion?
This command queries the power supply to determine the present SCPI version. The
returned value is of a string in the form YYYY.V where the “Y’s” represent the year
of the version, and the “V” represents a version number for that year (for example,
1995.0).
*IDN?
This query command reads the power supply's identification string. The power supply
returns four fields separated by commas. The first field is the manufacturer's name,
the second field is the model number, the third field is not used (always “0”), and the
fourth field is a revision code which contains three numbers. The first number is the
firmware revision number for the main power supply processor; the second is for the
input/output processor; and the third is for the front-panel processor.
The command returns a string with the following format (be sure to dimension a string
variable with at least 40 characters):
HEWLETT-PACKARD,E3631A,0,X.X-X.X-X.X
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*RST
This command resets the power supply to its power-on state as follows:
Command
State
CURR[:LEV][:IMM]
CURR[:LEV]:TRIG
DISP[:STAT]
INST[:SEL]
INST:COUP
OUTP[:STAT]
OUTP:TRAC
TRIG:DEL
TRIG:SOUR
VOLT[:LEV][:IMM]
VOLT[:LEV]:TRIG
Output dependent value*
Output dependent value*
ON
P6V
NONE
OFF
OFF
0
BUS
0
0
*The reset operation sets the current of +6V output to 5 A and the current of +25V
and -25V outputs to 1 A.
*TST?
This query performs a complete self-test of the power supply. Returns “0” if the selftest passes or “1” or any non-zero value if it fails. If the self-test fails, an error message
is also generated with additional information on why the test failed.
*SAV { 1|2|3 }
This command stores the present state of the power supply to the specified location
in non-volatile memory. Three memory locations (numbered 1, 2 and 3) are available
to store operating states of the power supply. The state storage feature “remembers”
the states or values of INST[:SEL], VOLT[:IMM], CURR[:IMM],
OUTP[:STAT], OUTP:TRAC, TRIG:SOUR, and TRIG:DEL. To recall a stored
state, you must use the same memory location used previously to store the state.
*RCL {1|2|3 }
This command recalls a previously stored state. To recall a stored state, you must use
the same memory location used previously to store the state. You recall *RST states
or values of the power supply from a memory location that was not previously
specified as a storage location.
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Calibration Commands
Calibration Commands
See chapter 3 “Calibration Overview”, starting on page 60 for an overview of the
calibration features of the power supply. For more detailed discussion of the
calibration procedures, see the Service Guide.
CALibration:COUNt?
This command queries the power supply to determine the number of times it has been
calibrated. Your power supply was calibrated before it left the factory. When you
receive your power supply, read the count to determine its initial value. Since the value
increments by one for each calibration point, a complete calibration for three outputs
will increase the value by six counts.
CALibration:CURRent[:DATA] <numeric value>
This command can only be used after calibration is unsecured. It enters a current
value of a selected output that you obtained by reading an external meter. You must
first select a calibration level (CAL:CURR:LEV) for the value being entered. Two
successive values (one for each end of the calibration range) must be selected and
entered. The power supply then computes new calibration constants. These
constants are then stored in non-volatile memory.
4
CALibration:CURRent:LEVel {MINimum|MAXimum}
Before using this command, you must select the output which is to be calibrated by
using INSTrument command. This command can only be used after calibration is
unsecured. It sets the power supply to a calibration point that is entered with
CALibration:CURRent[:DATA] command. During calibration, two points
must be entered and the low-end point (MIN) must be selected and entered first.
CALibration:SECure:CODE <new code>
This command enters a new security code. To change the security code, first unsecure
the power supply using the old security code. Then, enter the new code. The
calibration code may contain up to 12 characters over the remote interface but the first
character must always be a letter.
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Calibration Commands
CALibration:SECure:STATe {OFF|ON>}, <code>
This command unsecures or secures the power supply for calibration. The calibration
code may contain up to 12 characters over the remote interface.
CALibration:SECure:STATe?
This command queries the secured state for calibration of the power supply. The
returned parameter is “0” (OFF) or “1” (ON).
CALibration:STRing <quoted string>
This command records calibration information about your power supply.
For example, you can store such information as the last calibration date, the next
calibration due date, or the power supply’s serial number. The calibration message
may contain up to 40 characters. The power supply should be unsecured before
sending a calibration message.
CALibration:STRing?
This command queries the calibration message and returns a quoted string.
CALibration:VOLTage[:DATA] <numeric value>
This command can only be used after calibration is unsecured. It enters a voltage value
of a selected output that you obtained by reading an external meter. You must first
select a calibration level (CAL:VOLT:LEV) for the value being entered. Two
successive values (one for each end of the calibration range) must be selected and
entered. The power supply then computes new voltage calibration constants. These
constants are then stored in non-volatile memory.
CALibration:VOLTage:LEVel {MINimum|MAXimum}
Before using this command, you must select the output which is to be calibrated by
using INSTrument command. This command can only be used after calibration is
unsecured. It sets the power supply to a calibration point that is entered with
CALibration:VOLTage[:DATA] command. During calibration, two points
must be entered and the low-end point (MIN) must be selected.
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RS-232 Interface Commands
RS-232 Interface Commands
Use the front-panel “I/O configuration” key to select the baud rate, parity,
and the number of data bits (See chapter 3 “Remote Interface Configuration”, starting
on page 50).
SYSTem:LOCal
This command places the power supply in the local mode during RS-232 operation.
All keys on the front panel are fully functional.
SYSTem:REMote
This command places the power supply in the remote mode for RS-232 operation.
All keys on the front panel, except the “Local” key, are disabled.
It is very important that you send the SYSTem:REMote command to place the
power supply in the remote mode. Sending or receiving data over the RS-232
interface when not configured for remote operation can cause unpredictable
results.
SYSTem:RWLock
This command places the power supply in the remote mode for RS-232 operation.
This command is the same as the SYSTem:REMote command except that all keys
on the front panel are disabled, including the “Local” key.
Ctrl-C
This command clears the operation in progress over the RS-232 interface and discard
any pending output data. This is equivalent to the IEEE-488 device clear action over
the GPIB interface.
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The SCPI Status Registers
The SCPI Status Registers
All SCPI instruments implement status registers in the same way. The status system
records various instrument conditions in three register groups: the Status Byte register,
the Standard Event register, and the Questionable Status register group. The status
byte register records high-level summary information reported in the other register
groups. The diagrams on the subsequent pages illustrate the SCPI status system used
by the power supply.
An example program is included in chapter 6, “Application Programs,” which shows
the use of the status registers. You may find it useful to refer to the program after
reading the following section in this chapter.
What is an Event Register?
An event register is a read-only register that reports defined conditions within the
power supply. Bits in an event register are latched. Once an event bit is set, subsequent
state changes are ignored. Bits in an event register are automatically cleared by a query
of that register (such as *ESR? or STAT:QUES:EVEN?) or by sending the *CLS
(clear status) command. A reset (*RST) or device clear will not clear bits in event
registers. Querying an event register returns a decimal value which corresponds to the
binary-weighted sum of all bits set in the register.
What is an Enable Register?
An enable register defines which bits in the corresponding event register are logically
ORed together to form a single summary bit. Enable registers are both readable and
writable. Querying an enable register will not clear it. The *CLS (clear status)
command does not clear enable registers but it does clear the bits in the event registers.
To enable bits in an enable register, you must write a decimal value which corresponds
to the binary-weighted sum of the bits you wish to enable in the register.
What is a Multiple Logical Output?
The three-logical outputs of the power supply include an INSTrument summary status
register and an individual instrument ISUMmary register for each logical output. The
ISUMmary registers report to the INSTrument register, which in turn reports to bit
13 of the Questionable status register. This is shown pictorially on the next page.
Using such a status register configuration allows a status event to be cross-referenced
by output and type of event. The INSTrument register indicates which output(s) have
generated an event. The ISUMmary register is a pseudo-questionable status register
for a particular logical output.
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SCPI Status System
Binary Weights
20 = 1
21 = 2
22 = 4
23 = 8
24 = 16
25 = 32
26 = 64
27 = 128
28 = 256
29 = 512
210 = 1024
211 = 2048
212 = 4096
213 = 8192
214 = 16384
215 = 32768
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The Questionable Status Register
The Questionable Status register provides information about unexpected operation of
the power supply. Bit 4 reports a fault with the fan, and bit 13 summarizes questionable
outputs for any of the three supplies. For example if one of the three supplies is in
constant voltage mode and due to an overload loses regulation, bit 13 is set (latched).
Send the command STAT:QUES? to read the register. To make use of bit 13 you must
first enable registers you wish to summarize with bit 13. Send
STAT:QUES:INST:ENAB 14 to enable the Questionable Instrument register. Then
send STAT:QUES:INST:ISUM<n>:ENAB 3 for each supply to enable the
Questionable Instrument Summary register, where n is 1, 2, or 3.
Table 4-2. Bit Definitions - Questionable Status Register
Bit
Decimal
Value
Definition
0-3
Not used
0
Always set to 0.
4
FAN
16
The fan has a fault condition.
5-12
Not Used
0
Always set to 0.
13
ISUM
14-15
Not Used
8192
0
Summary of QUES:INST and QUES:INST:ISUM registers.
Always set to 0.
The Questionable Instrument Status Register
The Questionable Instrument register provides information about unexpected
operations for each of the three supplies. For example if the +6V supply is in the
constant voltage mode and loses regulation, then bit 1 set indicating a possible
overload in the +6V supply. The +25V supply is reported as bit 2, and the -25V supply
as bit 3. Send the command STAT QUES:INST? to read the register. The
STAT:QUES:INST:ISUM<n> registers must be enabled to make use of the
Questionable Instrument register. Send STAT:QUES:INST:ISUM<n>:ENAB 3
to enable output n.
The Questionable Instrument Summary Register
There are three Questionable Instrument Summary registers, one for each supply
output. These registers provide information about voltage and current regulation. Bit
0 is set when the voltage becomes unregulated, and bit 1 is set if the current becomes
unregulated. For example if a supply which is operating as a voltage source (constant
voltage mode) momentarily goes to constant current mode, bit 0 is set to indicate that
the voltage output is not regulated. To read the register for each supply, send
STAT:QUES:INST:ISUM<n>?, where n is 1, 2, or 3.
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To determine the operating mode (CV or CC) for the power supply send
STAT:QUES:INST:ISUM<n>:COND?, where n is 1, 2, or 3 depending on the
output. Bit 1 true indicates the output is in constant voltage mode, bit 0 true indicates
constant current mode, both bits true indicates neither the voltage nor the current is
regulated, and both bits false indicates the outputs of the power supply are off.
The Questionable Status Event register is cleared when:
• You execute the *CLS (clear status) command.
• You query the event register using STATus:QUEStionable[:EVENt]?
(Status Questionable Event register) command.
For example, 16 is returned when you have queried the status of the questionable
event register, the FAN condition is questionable.
The Questionable Status Enable register is cleared when:
• You execute STATus:QUEStionable:ENABle 0 command.
For example, you must send the STAT:QUES:ENAB 16 to enable the FAN bit.
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The Standard Event Register
The Standard Event register reports the following types of instrument events: poweron detected, command syntax errors, command execution errors, self-test or
calibration errors, query errors, or when an *OPC command is executed. Any or all
of these conditions can be reported in the Standard Event Summary bit (ESB, bit 5)
of Status Byte register through the enable register. To set the enable register mask,
you write a decimal value to the register using the *ESE (Event Status Enable)
command.
An error condition (Standard Event register bits 2, 3, 4, or 5) will always record
one or more errors in the power supply's error queue. Read the error queue using
the SYSTem:ERRor? command.
Table 4-3. Bit Definitions - Standard Event Register
Bit
Decimal
Value
4
Definition
Operation Complete. All commands prior to and including an
*OPC command have been executed.
0
OPC
1
1
Not Used
0
Always set to 0.
2
QYE
4
Query Error. The power supply tried to read the output buffer
but it was empty. Or, new command line was received before
a previous query had been read. Or, both the input and output
buffers are full.
3
DDE
8
Device Error. A self-test or calibration error occurred (see error
numbers 601 through 748 in chapter 5).
4
EXE
16
Execution Error. An execution error occurred (see error numbers
-211 through -224 in chapter 5).
5
CME
32
Command Error. A command syntax error occurred (see error
number -101 through -178 in chapter 5).
6
Not Used
0
7
PON
128
Always set to 0.
Power On. Power has been turned off and on since the last
time the event register was read or cleared
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The Standard Event register is cleared when:
• You execute the *CLS (clear status) command.
• You query the event register using the *ESR? (Event Status register) command.
For example, 28 (4 + 8 + 16) is returned when you have queried the status of the
Standard Event register, QYE, DDE, and EXE conditions have occurred.
The Standard Event Enable register is cleared when:
• You execute the *ESE 0 command.
• You turn on the power and have previously configured the power supply using the
*PSC 1 command.
• The enable register will not be cleared at power-on if you have previously
configured the power supply using the *PSC 0 command.
For example, you must send the *ESE 24 (8 + 16) to enable DDE and EXE
bits.
The Status Byte Register
The Status Byte summary register reports conditions from the other status registers.
Query data that is waiting in the power supply's output buffer is immediately reported
through the “Message Available” bit (bit 4) of Status Byte register. Bits in the summary
register are not latched. Clearing an event register will clear the corresponding bits in
the Status Byte summary register. Reading all messages in the output buffer, including
any pending queries, will clear the message available bit.
Table 4-4. Bit Definitions - Status Byte Summary Register
Bit
0-2
Not Used
Decimal
Value
Definition
0
Always set to 0.
3
QUES
8
One or more bits are set in the questionable status
register (bits must be “enabled” in the enable register).
4
MAV
16
Data is available in the power supply output buffer.
5
ESB
32
One or more bits are set in the standard event register
(bits must be “enabled” in the enable register).
6
RQS
64
The power supply is requesting service (serial poll).
7
Not Used
0
Always set to 0.
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The Status Byte Summary register is cleared when:
• You execute the *CLS (clear status) command.
• Querying the Standard Event register (*ESR? command) will clear only bit 5 in
the Status Byte summary register.
For example, 24 (8 + 16) is returned when you have queried the status of the Status
Byte register, QUES and MAV conditions have occurred.
The Status Byte Enable register (Request Service) is cleared when:
• You execute the *SRE 0 command.
• You turn on the power and have previously configured the power supply using the
*PSC 1 command.
• The enable register will not be cleared at power-on if you have previously
configured the power supply using *PSC 0.
For example, you must send the *SRE 96 (32 + 64) to enable ESB and RQS bits.
4
Using Service Request (SRQ) and Serial POLL
You must configure your bus controller to respond to the IEEE-488 service request
(SRQ) interrupt to use this capability. Use the Status Byte enable register (*SRE
command) to select which summary bits will set the low-level IEEE-488 service
request signal. When bit 6 (request service) is set in the Status Byte, an IEEE-488
service request interrupt message is automatically sent to the bus controller. The bus
controller may then poll the instruments on the bus to identify which one requested
service (the instrument with bit 6 set in its Status Byte).
The request service bit is cleared only by reading the Status Byte using an IEEE-488
serial poll or by reading the event register whose summary bit is causing the service
request.
To read the Status Byte summary register, send the IEEE-488 serial poll message.
Querying the summary register will return a decimal value which corresponds to the
binary-weighted sum of the bits set in the register. Serial poll will automatically clear
the “request service” bit in the Status Byte summary register. No other bits are affected.
Performing a serial poll will not affect instrument throughput.
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Caution
The IEEE-488 standard does not ensure synchronization between your bus controller
program and the instrument. Use the *OPC? command to guarantee that commands
previously sent to the instrument have completed. Executing a serial poll before a
*RST,*CLS, or other commands have completed can cause previous conditions to
be reported.
Using *STB? to Read the Status Byte
The *STB? (Status Byte query) command is similar to a serial poll but it is processed
like any other instrument command. The *STB? command returns the same result
as a serial poll but the “request service” bit (bit 6) is not cleared.
The*STB? command is not handled automatically by the IEEE-488 bus interface
hardware and will be executed only after previous commands have completed. Polling
is not possible using the *STB? command. Executing the *STB? command does
not clear the Status Byte summary register.
Using the Message Available Bit (MAV)
You can use the Status Byte “message available” bit (bit 4) to determine when data is
available to read into your bus controller. The power supply subsequently clears bit
4 only after all messages have been read from the output buffer.
To Interrupt Your Bus Controller Using SRQ
1 Send a device clear message to clear the power supply's output buffer (e.g., CLEAR
705).
2 Clear the event registers with the *CLS (clear status) command.
3 Set up the enable register masks. Execute the *ESE command to set up the Standard
Event register and the *SRE command for the Status Byte.
4 Send the *OPC? (operation complete query) command and enter the result to ensure
synchronization.
5 Enable your bus controller's IEEE-488 SRQ interrupt.
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To Determine When a Command Sequence is Completed
1 Send a device clear message to clear the power supply's output buffer
(e.g., CLEAR 705).
2 Clear the event registers with the *CLS (clear status) command.
3 Enable the “operation complete” bit (bit 0) in the Standard Event register by executing
the *ESE 1 command.
4 Send the *OPC? (operation complete query) command and enter the result to ensure
synchronization.
5 Execute your command string to program the desired configuration, and then execute
the *OPC (operation complete) command as the last command. When the command
sequence is completed, the “operation complete” bit (bit 0) is set in the Standard
Event register.
6 Use a serial poll to check to see when bit 5 (standard event) is set in the Status Byte
summary register. You could also configure the power supply for an SRQ interrupt
by sending *SRE 32 (Status Byte enable register, bit 5).
4
Using *OPC to Signal When Data is in the Output Buffer
Generally, it is best to use the “operation complete” bit (bit 0) in the Standard Event
register to signal when a command sequence is completed. This bit is set in the register
after an *OPC command has been executed. If you send *OPC after a command which
loads a message in the power supply's output buffer (query data), you can use the
“operation complete” bit to determine when the message is available. However, if too
many messages are generated before the *OPC command executes (sequentially), the
output buffer will fill and the power supply will stop processing commands.
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Status Reporting Commands
Status Reporting Commands
See diagram “SCPI Status System”, on page 92 in this chapter for detailed
information of the status register structure of the power supply.
SYSTem:ERRor?
This query command reads one error from the error queue. When the front-panel
ERROR annunciator turns on, one or more command syntax or hardware errors have
been detected. A record of up to 20 errors can be stored in the power supply’s error
queue. See “Error Messages” in chapter 5
• Errors are retrieved in first-in-first-out (FIFO) order. The first error returned is the
first error that was stored. When you have read all errors from the queue, the
ERROR annunciator turns off. The power supply beeps once each time an error
is generated.
• If more than 20 errors have occurred, the last error stored in the queue (the most
recent error) is replaced with -350, “Queue overflow”. No additional errors are
stored until you remove errors from the queue. If no errors have occurred when
you read the error queue, the power supply responds with +0, “No error”.
• The error queue is cleared when power has been off or after a *CLS (clear status)
command has been executed. The *RST (reset) command does not clear the error
queue.
STATus:QUEStionable[:EVENt]?
This command queries the Questionable Status event register. The power supply
returns a decimal value which corresponds to the binary-weighted sum of all bits in
the register.
STATus:QUEStionable:ENABle <enable value>
This command enables bits in the Questionable Status enable register. The selected
bits are then reported to the Status Byte.
STATus:QUEStionable:ENABle?
This command queries the Questionable Status enable register. The power supply
returns a binary-weighted decimal representing the bits set in the enable register.
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STATus:QUEStionable:INSTrument[:EVENt]?
This command queries the Questionable Instrument event register. The power supply
returns a decimal value which corresponds to the binary-weighted sum of all bits in
the register and clears the register.
STATus:QUEStionable:INSTrument:ENABle <enable value>
This command sets the value of the Questionable Instrument enable register. This
register is a mask for enabling specific bits from the Questionable Instrument event
register to set the Instrument Summary bit (ISUM, bit 13) of the Questionable Status
register. The “ISUM” bit of the Questionable Status register is the logical OR of all
the Questionable Instrument event register bits that are enabled by the Questionable
Instrument enable register.
STATus:QUEStionable:INSTrument:ENABle?
This query returns the value of the Questionable Instrument enable register.
STATus:QUEStionable:INSTrument:ISUMmary<n>[:EVENt]?
This query returns the value of the Questionable Instrument Isummary event
register for a specific output of the three-output power supply. The particular output
must be specified by a numeric value. n is 1, 2, or 3. See Table 4-1 on page 74 for
the output number. The event register is a read-only register which holds (latches) all
events. Reading the Questionable Instrument Isummary event register clears it.
STATus:QUEStionable:INSTrument:ISUMmary<n>:CONDition?
This query returns the CV or CC condition of the specified instrument. If “2” is
returned, the queried instrument is in the CV operating mode. If “1” is returned, the
queried instrument is in the CC operating mode. If “0” is returned, the outputs of the
instrument are off or unregulated. If ‘3” is returned, the instrument is in the hardware
failure. n is 1, 2, or 3.
STATus:QUEStionable:INSTrument:ISUMmary<n>:ENABle <enable value>
This command sets the value of the Questionable Instrument Isummary enable register
for a specific output of the three-output power supply. The particular output must be
specified by a numeric value. n is 1, 2, or 3. See Table 4-1 on page 74 for the output
number. This register is a mask for enabling specific bits from the Questionable
Instrument Isummary event register to set the Instrument Summary bit (bit 1, 2, and
3) of the Questionable Instrument register. These bits 1, 2, and bit 3 are the logical
OR of all the Questionable Instrument Isummary event register bits that are enabled
by the Questionable Instrument Isummary enable register.
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STATus:QUEStionable:INSTrument:ISUMmary<n>:ENABle?
This query returns the value of the Questionable Instrument Isummary enable register.
n is 1, 2, or 3.
*CLS
This command clears all event registers and Status Byte register.
*ESE<enable value>
This command enables bits in the Standard Event enable register. The selected bits
are then reported to the Status Byte.
*ESE?
This command queries the Standard Event enable register. The power supply returns
a decimal value which corresponds to the binary-weighted sum of all bits in the
register.
*ESR?
This command queries the Standard event register. The power supply returns a
decimal value which corresponds to the binary-weighted sum of all bits in the register.
*OPC
This command sets the “Operation Complete” bit (bit 0) of the Standard Event register
after the command is executed.
*OPC?
This command returns “1” to the output buffer after the command is executed.
*PSC { 0|1 }
(Power-on status clear.) This command clears the Status Byte and the Standard Event
register enable masks when power is turned on (*PSC 1). When *PSC 0 is in effect,
the Status Byte and Standard Event register enable masks are not cleared when power
is turned on.
*PSC?
This command queries the power-on status clear setting. The returned parameter is
“0” (*PSC 0) or “1” (*PSC 1).
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*SRE <enable value>
This command enables bits in the Status Byte enable register.
*SRE?
This command queries the Status Byte Enable register. The power supply returns a
decimal value which corresponds to the binary-weighted sum of all bits set in the
register.
*STB?
This command queries the Status Byte summary register. The *STB? command is
similar to a serial poll but it is processed like any other instrument command. The
*STB? command returns the same result as a serial poll but the “Request Service”
bit (bit 6) is not cleared if a serial poll has occurred.
*WAI
This command instructs the power supply to wait for all pending operations to
complete before executing any additional commands over the interface. Used only
in the triggered mode.
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An Introduction to the SCPI Language
An Introduction to the SCPI Language
SCPI (Standard Commands for Programmable Instruments) is an ASCII-based
instrument command language designed for test and measurement instruments. Refer
to “Simplified Programming Overview”, starting on page 70 for an introduction to
the basic techniques used to program the power supply over the remote interface.
SCPI commands are based on a hierarchical structure, also known as a tree system.
In this system, associated commands are grouped together under a common node or
root, thus forming subsystems. A portion of the SOURce subsystem is shown below
to illustrate the tree system.
[SOURce:]
CURRent {<current>|MIN|MAX}
CURRent? [MIN|MAX]
CURRent:
TRIGgered {<current>|MIN|MAX}
TRIGgered?{MIN|MAX}
VOLTage {<voltage>|MIN|MAX}
VOLTage? [MIN|MAX]
VOLTage:
TRIGgered {<voltage>|MIN|MAX}
TRIGgered? {MIN|MAX}
SOURce is the root keyword of the command, CURRent and VOLTage are secondlevel keywords, and TRIGgered is third-level keywords. A colon (:) separates a
command keyword from a lower-level keyword.
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Command Format Used in This Manual
The format used to show commands in this manual is shown below:
CURRent {<current>|MINimum|MAXimum}
The command syntax shows most commands (and some parameters) as a mixture of
upper- and lower-case letters. The upper-case letters indicate the abbreviated spelling
for the command. For shorter program lines, send the abbreviated form. For better
program readability, send the long form.
For example, in the above syntax statement, CURR and CURRENT are both acceptable
forms. You can use upper- or lower-case letters. Therefore, CURRENT, curr, and
Curr are all acceptable. Other forms, such as CUR and CURREN, will generate an
error.
Braces( { }) enclose the parameter choices for a given command string. The braces
are not sent with the command string.
4
A vertical bar ( | ) separates multiple parameter choices for a given
command string.
Triangle brackets ( < >) indicate that you must specify a value for the enclosed
parameter. For example, the above syntax statement shows the current parameter
enclosed in triangle brackets. The brackets are not sent with the command string. You
must specify a value for the parameter (such as "CURR 0.1").
Some parameters are enclosed in square brackets ( [ ] ). The brackets indicate that the
parameter is optional and can be omitted. The brackets are not sent with the command
string. If you do not specify a value for an optional parameter, the power supply
chooses a default value.
A colon ( : ) separates a command keyword from a lower-level keyword. You must
insert a blank space to separate a parameter from a command keyword. If a command
requires more than one parameter, you must separate adjacent parameters using a
comma as shown below:
"SOURce:CURRent:TRIGgered"
"APPL P6V,3.5,1.5"
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Command Separators
A colon ( : ) is used to separate a command keyword from a lower-level keyword as
shown below:
"SOURce:CURRent:TRIGgered"
A semicolon ( ; ) is used to separate two commands within the same subsystem, and
can also minimize typing. For example, sending the following command string:
"SOUR:VOLT MIN;CURR MAX"
... is the same as sending the following two commands:
"SOUR:VOLT MIN"
"SOUR:CURR MAX"
Use a colon and a semicolon to link commands from different subsystems. For
example, in the following command string, an error is generated if you do not use the
colon and semicolon:
"INST P6V;:SOUR:CURR MIN"
Using the MIN and MAX parameters
You can substitute MINimum or MAXimum in place of a parameter for many
commands. For example, consider the following command:
CURRent {<current>|MIN|MAX}
Instead of selecting a specific current, you can substitute MINimum to set the current
to its minimum value or MAXimum to set the current to its maximum value.
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Querying Parameter Settings
You can query the value of most parameters by adding a question mark (?) to the
command. For example, the following command sets the output current to 5 amps:
"CURR 5"
You can query the value by executing:
"CURR?"
You can also query the minimum or maximum value allowed with the present function
as follows:
"CURR? MAX"
"CURR? MIN"
Caution
If you send two query commands without reading the response from the first, and
then attempt to read the second response, you may receive some data from the first
response followed by the complete second response. To avoid this, do not send a
query command without reading the response. When you cannot avoid this
situation, send a device clear before sending the second query command.
SCPI Command Terminators
A command string sent to the power supply must terminate with a <new line>
character. The IEEE-488 EOI (end-or-identify) message is interpreted as a <new line>
character and can be used to terminate a command string in place of a <new line>
character. A <carriage return> followed by a <new line> is also accepted. Command
string termination will always reset the current SCPI command path to the root level.
IEEE-488.2 Common Commands
The IEEE-488.2 standard defines a set of common commands that perform functions
like reset, self-test, and status operations. Common commands always begin with an
asterisk ( * ), are four to five characters in length, and may include one or more
parameters. The command keyword is separated from the first parameter by a blank
space. Use a semicolon ( ; ) to separate multiple commands as shown below:
"*RST; *CLS; *ESE 32; *OPC?"
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SCPI Parameter Types
The SCPI language defines several different data formats to be used in program
messages and response messages.
Numeric Parameters Commands that require numeric parameters will accept all
commonly used decimal representations of numbers including optional signs,
decimal points, and scientific notation. Special values for numeric parameters like
MINimum,MAXimum, and DEFault are also accepted. You can also send
engineering unit suffixes (V, A or SEC) with numeric parameters. If only specific
numeric values are accepted, the power supply will automatically round the input
numeric parameters. The following command uses a numeric parameter:
CURR {<current>|MINimum|MAXimum}
Discrete Parameters Discrete parameters are used to program settings that have a
limited number of values (like BUS, IMM). Query responses will always return the
short form in all upper-case letters. The following command uses discrete parameters:
TRIG:SOUR {BUS|IMM}
Boolean Parameters Boolean parameters represent a single binary condition that is
either true or false. For a false condition, the power supply will accept “OFF” or “0”.
For a true condition, the power supply will accept “ON” or “1”. When you query a
boolean setting, the power supply will always return “0” or “1”. The following
command uses a boolean parameter:
DISP {OFF|ON}
String Parameters String parameters can contain virtually any set of ASCII
characters. A string must begin and end with matching quotes; either with a single
quote or with a double quote. You can include the quote delimiter as part of the string
by typing it twice without any characters in between. The following command uses
a string parameter:
DISPlay:TEXT <quoted string>
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Halting an Output in Progress
Halting an Output in Progress
You can send a device clear at any time to stop an output in progress over the GPIB
interface. The status registers, the error queue, and all configuration states are left
unchanged when a device clear message is received. Device clear performs the
following actions.
• The power supply's input and output buffers are cleared.
• The power supply is prepared to accept a new command string.
• The following statement shows how to send a device clear over the GPIB interface
using Agilent BASIC.
CLEAR 705
IEEE-488 Device Clear
• The following statement shows how to send a device clear over the GPIB
interface using the GPIB Command Library for C or QuickBASIC.
4
IOCLEAR (705)
For RS-232 operation, sending the <Ctrl-C> character will perform the same
operation as the IEEE-488 device clear message. The power supply's DTR (data
terminal ready) handshake line is set true following a device clear message. See
DTR/DSR Handshake Protocol, on page 58 for further details.
Note
All remote interface configurations can be entered only from the front panel. See
“RS-232 Interface Configuration” in chapter 3 to configure for GPIB or RS-232
interface before operating the power supply remotely.
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SCPI Conformance Information
SCPI Conformance Information
The Agilent E3631A Power Supply conforms to the 1995.0 version of the SCPI
standard. Many of the commands required by the standard are accepted by the power
supply but are not described in this manual for simplicity or clarity. Most of these
non-documented commands duplicate the functionality of a command already
described in this manual.
SCPI Confirmed Commands
The following table lists the SCPI-confirmed commands that are used by the power
supply.
SCPI Confirmed Commands
DISPlay
[:WINDow][:STATe] {OFF|ON}
[:WINDow][:STATe]?
[:WINDow]:TEXT[:DATA] <quoted string>
[:WINDow]:TEXT[:DATA]?
[:WINDow]:TEXT:CLEar
INSTrument
[:SELect] {P6V|P25V|N25V}
[:SELect]?
:NSELect :{1|2|3}
:NSELect?
COUPle[:TRIGger] {ALL|NONE| <list>
COUPle[:TRIGger]?
MEASure
:CURRent[:DC]?
[:VOLTage][:DC]?
OUTPUT
[:STATe] {OFF/ON}
[:STATE]?
[SOURce]
:CURRent[:LEVel][:IMMediate][:AMPLitude] {<current>|MIN|MAX}
:CURRent[:LEVel][:IMMediate][:AMPLitude]? [MIN|MAX]
:CURRent[:LEVel]:TRIGgered[AMPLitude] {<current>|MIN|MAX}
:CURRent[:LEVel]:TRIGgered[:AMPLitude]? [MIN|MAX]
:VOLTage[:LEVel][:IMMediate][:AMPLitude] {<voltage>|MIN|MAX}
:VOLTage[:LEVel][IMMediate][:AMPLitude]?[MIN:MAX]
:VOLTage[:LEVel]:TRIGgered[:AMPLitude] {<voltage>|MIN|MAX}
:VOLTage[:LEVel]:TRIGgered[:AMPLitude]?[MIN|MAX]
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SCPI Confirmed (continued)
STATus
:QUEStionable[:EVENt]?
:QUEStionable:ENABle <enable value>
:QUEStionable:ENABle?
:QUEStionable:INSTrument[:EVENt]?
:QUEStionable:INSTrument:ENABle <enable value>
:QUEStionable:INSTrument:ENABle?
:QUEStionable:INSTrument:ISUMary<n>[:EVENt]?
:QUEStionable:INSTrument:ISUMary<n>:CONDition?
:QUEStionable:INSTrument:ISUMary<n>:ENABle <enable value>
:QUEStionable:INSTrument:ISUMary<n>:ENABle?
SYSTem
:BEEPer[:IMMediate]
:ERRor?
:VERSion
TRIGger
[:SEQuence]:DELay {<seconds>|MIN|MAX}
[:SEQuence]:DELay?
[:SEQuence]:SOURce{BUS|IMM}
[:SEQuence]:SOURce?
4
INITiate[:IMMediate]
111
Chapter 4 Remote Interface Reference
SCPI Conformance Information
Device Specific Commands
The following commands are device-specific to the Agilent E3631A power supply.
They are not included in the 1995.0 version of the SCPI standard. However, these
commands are designed with the SCPI standard in mind and they follow all of the
command syntax rules defined by the standard.
Non-SCPI Commands
APPLy
{P6V|P25V|N25V}[,{<voltage>|DEF|MIN|MAX>}[,{<current>|DEF|MIN|MAX}]]
APPLy? [{P6V|P25V|N25}]
CALibration
:COUNt?
:CURRent[:DATA] <numeric value>
:CURRent:LEVel {MIN|MAX}
:SECure:CODE <new code>
:SECure:STATe {OFF|ON},<code>
:SECure:STATe?
:STRing <quoted string>
:STRing?
:VOLTage[:DATA] <numeric value>
:VOLTage:LEVel {MIN|MAX}
MEASure
:CURRent [:DC]? [{P6V|P25V|N25V}]
[:VOLTage][:DC]? [{P6V|P25V|N25V}]
OUTPUT
:TRACK[:STATe] {OFF|ON}
:TRACK[:STATe]?
SYSTem
:LOCal
:REMote
:RWLock
112
Chapter 4 Remote Interface Reference
IEEE-488 Conformance information
IEEE-488 Conformance information
Dedicated Hardware Lines
ATN
IFC
REN
SRQ
Attention
Interface Clear
Remote Enable
Service Request Enable
Addressed Commands
DCL
EOI
GET
GTL
LLO
SDC
SPD
SPE
Device Clear
End or Identify
Group Execute Trigger
Go To Local
Local Lockout
Selected Device Clear
Serial Poll Disable
Serial Poll Enable
IEEE-488 Common Commands
*CLS
*ESE <enable value>
*ESE?
*ESR?
*IDN?
*OPC
*OPC?
*PSC {0|1}
*PSC?
*RST
*SAV {1|2|3}
*RCL {1|2|3}
*SRE <enable value>
*SRE?
*STB?
*TRG
*TST?
*WAI
4
113
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114
5
5
Error Messages
Error Messages
When the front-panel ERROR annunciator turns on, one or more command syntax
or hardware errors have been detected. A record of up to 20 errors is stored in the
power supply's error queue. The power supply beeps once each time an error is
generated.
• Errors are retrieved in first-in-first-out (FIFO) order. The first error returned is the
first error that was stored. When you have read all errors from the queue, the ERROR
annunciator turns off.
• If more than 20 errors have occurred, the last error stored in the queue (the most
recent error) is replaced with -350, “Queue overflow”. No additional errors are stored
until you remove errors from the queue. If no errors have occurred when you read the
error queue, the supply responds with + 0, “No error” over the remote interface or
“NO ERRORS” from the front panel.
• The error queue is cleared when power has been off or after a *CLS (clear status)
command has been executed. The *RST (reset) command does not clear the error
queue.
• Front-panel operation:
If the ERROR annunciator is on, press the Error key repeatedly to read the errors
stored in the queue. The error queue is cleared when you read all errors.
ERROR
-113
• Remote interface operation:
SYSTem:ERRor?
Reads one error from the error queue
Errors have the following format (the error string may contain up to 80 characters).
-113,"Undefined header"
116
Chapter 5 Error Messages
Execution Errors
Execution Errors
-101
Invalid character
An invalid character was found in the command string. You may have inserted a
character such as #, $, or % in the command keyword or within a parameter.
Example:
-102
Syntax error
Invalid syntax was found in the command string. You may have inserted a blank space
before or after a colon in the command header, or before a comma.
Example:
-103
OUTP:TRAC #ON
VOLT:LEV
,1
Invalid separator
An invalid separator was found in the command string. You may have used a comma
instead of a colon, semicolon, or blank space - or you may have used a blank space
instead of a comma.
Example:
TRIG:SOUR,BUS or APPL P6V 1.0 1.0
-104
Data type error
The wrong parameter type was found in the command string. You may have specified
a number where a string was expected, or vice versa.
-105
GET not allowed
A Group Execute Trigger (GET) is not allowed within a command string.
-108
Parameter not allowed
More parameters were received than expected for the command. You may have
entered an extra parameter, or you added a parameter to a command that does not
accept a parameter.
Example:
-109
OUTP? 10
Missing parameter
Fewer parameters were received than expected for the command. You omitted one or
more parameters that are required for this command.
Example:
APPL
117
5
Chapter 5 Error Messages
Execution Errors
-112
Program mnemonic too long
A command header was received which contained more than the maximum 12
characters allowed.
-113
Undefined header
A command was received that is not valid for this power supply. You may have
misspelled the command or it may not be a valid command. If you are using the short
form of the command, remember that it may contain up to four letters.
Example:
-114[1]
Header suffix out of range
The numeric suffix attached to a command header is not one of the allowable values.
Example:
-120[1]
STAT:QUES:INST:ISUM4?
Numeric data error
An invalid number was specified for a numeric parameter.
Example:
-121
TRIGG:DEL 3
VOLT 1.0E+320000
Invalid character in number
An invalid character was found in the number specified for a parameter value.
Example:
*ESE #B01010102
-123
Numeric overflow
A numeric parameter was found whose exponent was larger than 32,000.
-124
Too many digits
A numeric parameter was found whose mantissa contained more than 255 digits,
excluding leading zeros.
-128
Numeric data not allowed
A numeric parameter was received but a character string was expected.
Example:
DISP:TEXT 123
[1]This error message is only applicable for serial MY53xx6xxx.
118
Chapter 5 Error Messages
Execution Errors
-130[1]
Suffix error
A suffix was incorrectly specified for a numeric parameter. You may have misspelled
the suffix or the numeric parameter does not accept a suffix.
Example:
-131
TRIG:DEL 0.5 SECS
Invalid suffix
A suffix was incorrectly specified for a numeric parameter. You may have misspelled
the suffix.
Example:
TRIG:DEL 0.5 SECS
-134
Suffix too long
A suffix for a numeric parameter contained too many characters.
-138
Suffix not allowed
A suffix was received following a numeric parameter which does not accept a suffix.
Example:
STAT:QUES:ENAB 18 SEC (SEC is not a valid suffix).
-141
Invalid character data
Either the character data element contained an invalid character or the particular
element received was not valid for the header.
-144
Character data too long
The character data element contained too many characters.
-148
Character data not allowed
A discrete parameter was received but a character string or a numeric parameter was
expected. Check the list of parameters to verify that you have used a valid parameter
type.
Example:
-151
5
DISP:TEXT ON
Invalid string data
An invalid character string was received. Check to see if you have enclosed the
character string in single or double quotes.
Example:
DISP:TEXT ’ON
[1]This error message is only applicable for serial MY53xx6xxx.
119
Chapter 5 Error Messages
Execution Errors
-158
String data not allowed
A character string was received but is not allowed for the command. Check the list
of parameters to verify that you have used a valid parameter type.
Example:
TRIG:DEL ’zero’
-160 to -168
Block data errors
The power supply does not accept block data.
-170 to -178
Expression errors
The power supply does not accept mathematical expressions.
-211
Trigger ignored
A Group Execute Trigger (GET) or *TRG was received but the trigger was ignored.
Make sure that the trigger source should be selected to the bus and the trigger
subsystem should be initiated by INIT[:IMM] command.
-213[1]
Trigger ignored
An INITiate command was received but could not be executed because a
measurement was already in progress. Send a device clear to halt a measurement in
progress and place the power supply in the “idle” state.
-221
Init ignored
Indicates that a legal program data element was parsed but could not be executed due
to the current device state.
-222
Data out of range
A numeric parameter value is outside the valid range for the command.
Example:
TRIG:DEL -3
-223
Too much data
A character string was received but could not be executed because the string length
was more than 40 characters. This error can be generated by the
CALibration:STRing command.
-224
Illegal parameter value
A discrete parameter was received which was not a valid choice for the command.
You may have used an invalid parameter choice.
Example:
DISP:STAT XYZ (XYZ is not a valid choice).
[1]This error message is only applicable for serial MY53xx6xxx.
120
Chapter 5 Error Messages
Execution Errors
-330
Self-test failed
The power supply's complete self-test failed from the remote interface (*TST?
command). In addition to this error, more specific self-test errors are also reported.
See also “Self-Test Errors”, starting on page 123.
-350
Queue overflow
The error queue is full because more than 20 errors have occurred. No additional errors
are stored until you remove errors from the queue. The error queue is cleared when
power has been off, or after a *CLS (clear status) command has been executed.
-410
Query INTERRUPTED
A command was received which sends data to the output buffer, but the output buffer
contained data from a previous command (the previous data is not overwritten). The
output buffer is cleared when power has been off, or after a *RST (reset) command
has been executed.
-420
Query UNTERMINATED
The power supply was addressed to talk (i.e., to send data over the interface) but a
command has not been received which sends data to the output buffer. For example,
you may have executed an APPLy command (which does not generate data) and then
attempted an ENTER statement to read data from the remote interface.
-430
Query DEADLOCKED
A command was received which generates too much data to fit in the output buffer
and the input buffer is also full. Command execution continues but all data is lost.
-440
Query UNTERMINATED after indefinite response
The *IDN? command must be the last query command within a command string.
Example:
*IDN?;:SYST:VERS?
501
Isolator UART framing error
502
Isolator UART overrun error
503[1]
SPI data error
Data error was detected during the communication between the main controller U10
and the I/O controller U21.
[1]This error message is only applicable for serial MY53xx6xxx.
121
5
Chapter 5 Error Messages
Execution Errors
511
RS-232 framing error
512
RS-232 overrun error
513
RS-232 parity error
514
Command allowed only with RS-232
There are three commands which are only allowed with the RS-232 interface:
SYSTem:LOCal, SYSTem:REMote, and SYSTem:RWLock.
521
Input buffer overflow
522
Output buffer overflow
550
Command not allowed in local
You should always execute the SYSTem:REMote command before sending other
commands over the RS-232 interface.
800
P25V and N25V coupled by track system
The OUTP:TRAC should be off when coupling between the +25V output and the
-25V output.
801
P25V and N25V coupled by trigger subsystem
The +25V output and the -25V output should be uncoupled to enable the tracking
operation for those outputs.
122
Chapter 5 Error Messages
Self-Test Errors
Self-Test Errors
The following errors indicate failures that may occur during a self-test. Refer to the
Service Guide for more information.
601
Front panel does not respond
602
RAM read/write failed
603
A/D sync stuck
604
A/D slope convergence failed
605
Cannot calibrate rundown gain
606
Rundown gain out of range
607
Rundown too noisy
608
Serial configuration readback failed
609[1]
System ADC test failed
624
Unable to sense line frequency
625
I/O processor does not respond
626
I/O processor failed self-test
630
Fan test failed
631
System DAC test failed
632
P6V hardware test failed
633
P25V hardware test failed
634
N25V hardware test failed
5
[1]This error message is only applicable for serial MY53xx6xxx.
123
Chapter 5 Error Messages
Calibration Errors
Calibration Errors
The following errors indicate failures that may occur during a calibration. Refer to
the Service Guide for more information.
701
Cal security disabled by jumper
The calibration security feature has been disabled with a jumper inside the power
supply. When applicable, this error will occur at power-on to warn you that the power
supply is unsecured.
702
Cal secured
The power supply is secured against calibration.
703
Invalid secure code
An invalid calibration security code was received when attempting to unsecure or
secure the power supply. You must use the same security code to unsecure the power
supply as was used to secure it, and vice versa. The security code may contain up to
12 alphanumeric characters. The first character must be a letter.
704
Secure code too long
A security code was received which contained more than 12 characters.
708
Cal output disabled
Calibration is aborted by sending OUTP OFF command during calibrating a output.
711
Cal sequence interrupted
Calibration sequence is interrupted by changing the instrument selection during
calibrating an output.
712
Bad DAC cal data
The specified DAC calibration constants (CAL:VOLT or CAL:CURR) are out of
range. Note that the new calibration constants are not stored in the
non-volatile memory.
713
Bad readback cal data
The specified readback calibration constants (CAL:VOLT or CAL:CURR) are out of
range. Note that the new calibration constants are not stored in the non-volatile
memory.
124
Chapter 5 Error Messages
Calibration Errors
740
Cal checksum failed, secure state
741
Cal checksum failed, string data
742
Cal checksum failed, store/recall data in location 1
743
Cal checksum failed, store/recall data in location 2
744
Cal checksum failed, store/recall data in location 3
745
Cal checksum failed, DAC cal constants
746
Cal checksum failed, readback cal constants
747
Cal checksum failed, GPIB address
748
Cal checksum failed, internal data
5
125
Chapter 5 Error Messages
Calibration Errors
THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
126
6
6
Application
Programs
Application Programs
This chapter contains several remote interface application programs to help you
develop programs for your own application. Chapter 4, “Remote Interface
Reference,” starting on page 65, lists the syntax for the SCPI (Standard Commands
for Programmable Instruments) commands available to program the power supply.
Agilent BASIC Programs
All of the Agilent BASIC example programs in this chapter were developed and tested
on an HP 9000 Series 300 controller. Each device on the GPIB (IEEE-488) interface
must have a unique address. You can set the power supply's address to any value
between 0 and 30. The current address is displayed momentarily on the front panel
when you turn on the power supply.
The GPIB (IEEE-488) address is set to “05” when the power supply is shipped from
the factory. The example programs in this chapter assume an GPIB address of 05.
When sending a command over the remote interface, you append this address to the
GPIB interface's select code (normally “7”). For example, if the select code is “7” and
the device address is “05”, the combination is “705”.
C and QuickBASIC Language Programs
All of the C and QuickBASIC Language example programs in this chapter are written
for the Agilent 82335 GPIB Interface Card using the GPIB Command Library for C.
Unless otherwise noted, the library functions used in the example programs are
compatible with the ANSI C standard. All of the C Language programs were compiled
and tested using the following compilers:
• Microsoft® QuickC® Version 2.0
• Borland® Turbo C® ++ Version 1.0
To compile the program to make an executable file, refer to the language manuals. To
link the object file you must previously specify TCLHPIB.LIB as a required library
file from the menu.
128
Chapter 6 Application Programs
Using the APPLy Command
Using the APPLy Command
This program demonstrates the following concepts:
• How to use the APPLy command to set output voltages and currents for three
outputs.
• How to use the *SAV command to store the instrument configuration in memory.
Agilent BASIC / GPIB (Program 1)
10 !
20 ! This program sets the output voltages and currents for
30 ! three outputs. This program also shows how to use "state
40 ! storage" to store the instrument configuration in memory.
50 !
60
ASSIGN @Psup TO 705
! Assign I/O path to address 705
70
CLEAR 7
! Clear interface - send "device clear"
80
OUTPUT @Psup;"*RST;*CLS"
! Reset and clear the power supply
90
OUTPUT @Psup;"*OPC"
! Verify reset command has executed
100 !
110
OUTPUT @Psup;"APPL P6V, 5.0, 1.0"
! Set 5.0 volts/1.0 amp to +6V output
120
OUTPUT @Psup;"APPL P25V, 15.0, 1.0" ! Set 15.0 volts/1.0 amp to +25V output
130
OUTPUT @Psup;"APPL N25V, -10.0, 0.8"! Set -10.0 volts/0.8 amps to -25V output
140 !
150
OUTPUT @Psup;"OUTP ON"
! Enable the outputs
160 !
170
OUTPUT @Psup;"*SAV 1"
! Store a state in memory location 1"
180 !
190 ! Use the "*RCL 1" command to recall the stored state
200 !
210
END
6
129
Chapter 6 Application Programs
Using the APPLy Command
C / GPIB (Program 1)
/***************************************************************************
This program sets up output voltages and currents for three outputs.
This program also shows how to use "state storage" to store the instrument
configuration in memory.
***************************************************************************/
#include
#include
#include
#include
<stdio.h>
<stdlib.h>
<string.h>
<cfunc.h>
#define ADDR 705L
/*
/*
/*
/*
Used for printf() */
Used for atoi() */
Used for strlen() */
Header file from GPIB Command Library */
/* Set GPIB address for power supply */
/* Function Prototypes */
void rst_clear(void);
void out_setting(void);
void output_on(void);
void command_exe(char *commands[], int length);
void state_save(void);
void check_error(char *func_name);
/**************************************************************************/
void main(void)
{
rst_clear();
output_on();
out_setting();
state_save();
}
/* Start of main() */
/*
/*
/*
/*
Reset the instrument and clear error queue */
Enable the outputs
Set output voltages currents */
Save a state of the power supply */
/**************************************************************************/
void rst_clear(void)
{
/* Reset the power supply, clear the error queue, and wait for
commands to complete. A "1" is sent to the output buffer from the
*OPC? command when *RST and *CLS are completed. */
IOOUTPUTS(ADDR, "*RST;*CLS;*OPC", 14);
}
/**************************************************************************/
130
Chapter 6 Application Programs
Using the APPLy Command
. . . continued
void out_setting(void)
{
/* Set 5.0 volts/1.0 amp to +6V output, 15 volts/1.0 amp to +25V output
and -10 volts/0.8 amps to -25V output. */
static char *cmd_string[]=
{
"APPL P6V, 5.0, 1.0;"
"APPL P25V, 15.0, 1.0;"
"APPL N25V, -10.0, 0.8"
};
/* Set 5.0 volts / 1.0 amp to +6V output */
/* Set 15.0 volts / 1.0 amp to +25V output */
/* Set -10.0 volts / 0.8 amp to -25V output */
/* Call the function to execute the command strings shown above */
command_exe(cmd_string, sizeof(cmd_string)/sizeof(char*));
/* Call the function to check for errors */
check_error("out_setting");
}
/**************************************************************************/
void output_on(void)
{
IOOUTPUTS(ADDR, "OUTP ON", 7)
/*Enable the outputs
}
/**************************************************************************/
void command_exe(char *commands[], int length)
{
/* Execute one command string at a time using a loop */
int loop;
6
for (loop = 0; loop < length; loop++)
{
IOOUTPUTS(ADDR, commands[loop], strlen(commands[loop]));
}
}
/**************************************************************************/
131
Chapter 6 Application Programs
Using the APPLy Command
. . . continued
void check_error(char *func_name)
{
/* Read error queue to determine if errors have occurred */
char message[80];
int length = 80;
IOOUTPUTS(ADDR, "SYST:ERR?", 9);
IOENTERS(ADDR, message, &length);
/* Read the error queue */
/* Enter error string */
while (atoi(message) != 0)
/* Loop until all errors are read */
{
printf("Error %s in function %s\n\n", message, func_name);
IOOUTPUTS(ADDR, "SYST:ERR?", 9);
IOENTERS(ADDR, message, &length);
}
}
/**************************************************************************/
void state_save(void)
{
/* Store a instrument state in memory location 1. */
IOOUTPUTS(ADDR, "*SAV 1", 6);
/* Save the state in memory location 1*/
}
/**************************************************************************/
End of Program 1
132
Chapter 6 Application Programs
Using the Low-Level Commands
Using the Low-Level Commands
This program demonstrates the following concepts:
• How to use the low-level commands to program three outputs.
• How to specify a trigger source and trigger the power supply over the GPIB
interface.
Agilent BASIC / GPIB (Program 2)
10 !
20 ! This program uses low-level SCPI commands to program the
30 ! power supply to output a 3 volts/0.5 amps for +6V output,
40 ! 20 volts/0.9 amps for +25V output, and 10 volts/0.5 amps for
50 ! -25V output. This program also shows the use of a trigger
60 ! received over the GPIB interface to initiate a single trigger.
70 !
80
ASSIGN @Psup TO 705
! Assign I/O path to address 705
80
CLEAR 7
! Clear the GPIB interface
90
OUTPUT @Psup;"*RST"
! Reset the power supply
100 !
110
OUTPUT @Psup;"INST:COUP:TRIG ALL" ! Couple three outputs
120
OUTPUT @Psup;"TRIG:SOUR BUS"
! Trigger source is "bus"
130
OUTPUT @Psup;"TRIG:DEL 30"
! Time delay 30 seconds"
140 !
150
OUTPUT @Psup;"INST:SEL P6V"
! Select +6V output
160
OUTPUT @Psup;"VOLT:TRIG 3"
! Set the pending voltage to 3 volts
170
OUTPUT @Psup;"CURR:TRIG 0.5"
! Set the pending current to 0.5 amps
180 !
190
OUTPUT @Psup;"INST:SEL P25V"
! Select +25V output
200
OUTPUT @Psup;"VOLT:TRIG 20"
! Set the pending voltage to 20 volts
210
OUTPUT @Psup;"CURR:TRIG 0.9"
! Set the pending current to 0.9 amps
220 !
230
OUTPUT @Psup;"INST:SEL N25V"
! Select -25V output
240
OUTPUT @Psup;"VOLT:TRIG -10"
! Set the pending voltage to -10 volts
250
OUTPUT @Psup;"CURR:TRIG 0.5"
! Set the pending current to 0.5 amps
260 !
270
OUTPUT @Psup;"OUTP ON"
! Enable the outputs
280 !
290
OUTPUT @Psup;"INIT"
! Initiate the trigger subsystem
300
310 ! Trigger the power supply over the GPIB interface
320 !
330
OUTPUT @Psup;"*TRG"
! Set output changes after time delay
340 !
350
OUTPUT @Psup;"INST:COUP:TRIG NONE" ! Uncouple three outputs!
360 !
370
END
6
133
Chapter 6 Application Programs
Using the Low-Level Commands
QuickBASIC / GPIB (Program 2)
REM $INCLUDE: 'QBSETUP'
'
' This program uses low-level SCPI commands to program the power
' supply to output 3 volts/0.5 amps for +6V output, 20 volts/0.9 amps
' for +25V output, and 10 volts/0.5 amps for -25V output. This program
' also shows the use of a trigger received over the GPIB interface to
' initiate a single trigger. The program is written in QuickBASIC and
' uses Agilent 82335 GPIB card and GPIB command library.
'
ISC& = 7
Dev& = 705
' GPIB select code is "7"
' Assign I/O path to address 705
Timeout = 5
' Configure device library for a 5 second timeout
CALL IOTIMEOUT(ISC&, Timeout)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
CALL IORESET(ISC&)
' Reset the Agilent 82335 GPIB card
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
CALL IOCLEAR(Dev&)
' Send a device clear to the power supply
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
CALL IOREMOTE(Dev&)
' Place the power supply in the remote mode
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
Info1$ = "*RST"
' Reset the power supply
Length1% = LEN(Info1$)
CALL IOOUTPUTS(Dev&, Info1$, Length1%)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
Info1$ = "INST:COUP:TRIG ALL"
' Couple three outputs
Length1% = LEN(Info1$)
CALL IOOUTPUTS(Dev&, Info1$, Length1%)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
Info1$ = "TRIG:SOUR BUS"
' Trigger source is "bus"
Length1% = LEN(Info1$)
CALL IOOUTPUTS(Dev&, Info1$, Length1%)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
Info1$ = "TRIG:DEL 30"
' Set 30 seconds of time time delay
Length1% = LEN(Info1$)
CALL IOOUTPUTS(Dev&, Info1$, Length1%)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
134
Chapter 6 Application Programs
Using the Low-Level Commands
. . . continued
Info1$ = "INST:SEL P6V"
' Select +6V output
Length1% = LEN(Info1$)
CALL IOOUTPUTS(Dev&, Info1$, Length1%)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
Info1$ = "VOLT:TRIG 3"
' Set the pending voltage to 3 volts
Length1% = LEN(Info1$)
CALL IOOUTPUTS(Dev&, Info1$, Length1%)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
Info1$ = "CURR:TRIG 0.5"
' Set the pending current to 0.5 amps
Length1% = LEN(Info1$)
CALL IOOUTPUTS(Dev&, Info1$, Length1%)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
Info1$ = "INST:SEL P25V"
' Select +25V output
Length1% = LEN(Info1$)
CALL IOOUTPUTS(Dev&, Info1$, Length1%)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
Info1$ = "VOLT:TRIG 20"
' Set the pending voltage to 20 volts
Length1% = LEN(Info1$)
CALL IOOUTPUTS(Dev&, Info1$, Length1%)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
Info1$ = "CURR:TRIG 0.9"
' Set the pending current to 0.9 amps
Length1% = LEN(Info1$)
CALL IOOUTPUTS(Dev&, Info1$, Length1%)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
Info1$ = "INST:SEL N25V"
' Select -25V output
Length1% = LEN(Info1$)
CALL IOOUTPUTS(Dev&, Info1$, Length1%)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
6
Info1$ = "VOLT:TRIG -10"
' Set the pending voltage to -10 volts
Length1% = LEN(Info1$)
CALL IOOUTPUTS(Dev&, Info1$, Length1%)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
Info1$ = "CURR:TRIG 0.5"
' Set the pending current to 0.5 amps
Length1% = LEN(Info1$)
CALL IOOUTPUTS(Dev&, Info1$, Length1%)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
Info1$ = "OUTP ON"
' Enable the outputs
Length1% = LEN(Info1$)
CALL IOOUTPUTS(Dev&, Info1$, Length1%)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
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Chapter 6 Application Programs
Using the Low-Level Commands
. . . continued
Info1$ = "INIT"
' Initiate the trigger subsystem
Length1% = LEN(Info1$)
CALL IOOUTPUTS(Dev&, Info1$, Length1%)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
Info1$ = "*TRG"
' Set output changes after time delay
Length1% = LEN(Info1$)
CALL IOOUTPUTS(Dev&, Info1$, Length1%)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
Info1$ = "INST:COUP:TRIG NONE"
' Uncouple three outputs
Length1% = LEN(Info1$)
CALL IOOUTPUTS(Dev&, Info1$, Length1%)
IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
END
End of Program 2
136
Chapter 6 Application Programs
Using the Status Registers
Using the Status Registers
This program teaches the following concepts:
• How to use the Status Registers to generate an interrupt if a SCPI error occurs. The
program sets up the Status Byte and Standard Event register and interrupts the
controller if an error is detected.
• How to service the interrupt if an error occurs and read the power supply's error
queue using the SYST:ERR? command.
Agilent BASIC / GPIB (Program 3)
10 !
20 ! This program uses the status registers to generate an
30 ! interrupt if a SCPI error occurs. The power supply
40 ! is programmed to output a 3V/0.5A for +6V output,
50 ! 10V/0.8A for +25V output, and -15V/0.2A for -25V output.
60 !
70
ASSIGN @Psup TO 705
! Assign I/O path to address 705
80
COM @Psup
! Use same address in subprogram
90
INTEGER Gpib,Mask,Value,B
! Declare integer variables
100
CLEAR 7
! Clear interface
110
OUTPUT @Psup;"*RST"
! Reset power supply
120 !
130 ! Set up error checking
140 !
150
Gpib=7
! GPIB select code is "7"
160
ON INTR Gpib CALL Err_msg
! Call subprogram if error occurs
170
Mask=2
! Bit 1 is SRQ
180
ENABLE INTR Gpib;Mask
! Enable SRQ to interrupt program
190 !
200
OUTPUT @Psup;"*SRE 32"
! Enable "Standard Event" bit in Status Byte
210
! to pull the IEEE-488 SRQ line
220
OUTPUT @Psup;"*ESE 60"
! Enable error bits (2, 3, 4, or 5) to set
230
! "Standard Event" bit in Status Byte
240
! and wait for operation complete
250
OUTPUT @Psup;"*CLS"
! Clear status registers
6
137
Chapter 6 Application Programs
Using the Status Registers
. . . continued
260
270
280
290
300
310
320
330
340
350
360
370
380
390
400
410
420
430
440
450
460
470
480
490
500
510
520
530
540
550
560
570
!
! Set the power supply to an output for three outputs
!
OUTPUT @Psup;"APPL P6V,3.0, 0.5"
! Set 3 V/0.5 A for +6V output,
OUTPUT @Psup;"APPL P25V,10.0, 0.8" ! Set 10 V/0.8 A for +25V output,
OUTPUT @Psup;"APPL N25V,-15.0, 0.2"! Set -15 V/0.2 A for -25V output
!
OUTPUT @Psup;"OUTP ON"!
! Enable the outputs
!
OUTPUT @Psup;"*OPC"
! Verify previous commands has executed
!
OFF INTR Gpib
! Disable interrupts
END
!
!***************************************************************************
!
SUB Err_msg ! Error subprogram is called if errors occurred
DIM Message$[80]
! Dimension array for error
INTEGER Code
! Define integer variable
COM @Psup
! Use same address as in main program
B=SPOLL(@Psup)
! Use Serial Poll to read Status Byte
! (all bits are cleared too)
!
! Loop until error queue is cleared
!
REPEAT
OUTPUT @Psup;"SYST:ERR?"
ENTER @Psup;Code,Message$
PRINT Code,Message$
UNTIL Code=0
STOP
SUBEND
End of Program 3
138
Chapter 6 Application Programs
RS-232 Operation Using QuickBASIC
RS-232 Operation Using QuickBASIC
The following example shows how to send command instruction and receive
command responses over the RS-232 interface using QuickBASIC.
RS-232 Operation Using QuickBASIC (Program 4)
CLS
LOCATE 1, 1
DIM cmd$(100), resp$(100)
' Set up serial port for 9600 baud, none parity, 8 bits;
' Ignore Request to Send and Carrier Detect; Send line feed,
' enable parity check, reserve 1000 bytes for input buffer
OPEN "com1:9600,n,8,2,rs,cd,lf,pe" FOR RANDOM AS #1 LEN = 1000
'
' Put the power supply into the remote operation mode
PRINT #1, "SYST:REM"
'
'Reset and clear the power supply
PRINT #1, "*RST;*CLS"
'
' Query the power supply's id string
PRINT #1, "*IDN?"
LINE INPUT #1, resp$
PRINT "*IDN? returned: ", resp$
'
' Ask what revision of SCPI the power supply conforms to
PRINT #1, "SYST:VERS?"
LINE INPUT #1, resp$
PRINT "SYST:VERS? returned: ", resp$
'
' Generate a beep
PRINT #1, "SYST:BEEP"
'
' Set the +6V outputs to 3 V, 3 A
PRINT #1, "APPL P6V, 3.0, 3.0"
'
' Enable the outputs
PRINT #1, "OUTP ON"
'
' Query the output voltage for +6V output
PRINT #1, "MEAS:VOLT? P6V"
LINE INPUT #1, resp $
PRINT "MEAS:VOLT? P6V returned: ", resp$
END
6
End of Program 4
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140
7
7
Tutorial
Tutorial
The Agilent E3631A is a high performance instrument capable of delivering clean dc
power. But to take full advantage of the performance characteristics designed into the
power supply, certain basic precautions must be observed when connecting it for use
on the lab bench or as a controlled power supply. This chapter describes basic
operation of linear power supplies and gives specific details on the operation and use
of the Agilent E3631A DC power supply:
• Overview of Agilent E3631A Operation, page 143
• Output Characteristics, page 145
• Connecting the Load, page 149
• Extending the Voltage Range, page 152
• Remote Programming, page 153
• Reliability, page 155
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Chapter 7 Tutorial
Overview of Agilent E3631A Operation
Overview of Agilent E3631A Operation
Series regulated power supplies were introduced many years ago and are still used
extensively today. The basic design technique, which has not changed over the years,
consists of placing a control element in series with the rectifier and load device. Figure
7-1 shows a simplified schematic of a series regulated supply with the series element
depicted as a variable resistor. Feedback control circuits continuously monitor the
output and adjust the series resistance to maintain a constant output voltage. Because
the variable resistance of Figure 7-1 is actually one or more power transistor operating
in the linear (class A) mode, supplies with this type of regulator are often called linear
power supplies. Linear power supplies have many advantages and usually provide the
simplest most effective means of satisfying high performance and low power
requirements.
Figure 7-1. Diagram of Simple Series Power Supply with Tap Selection
To keep the voltage across the series resistance low, some supplies use preregulation
before the rectifier bridge. Figure 7-1 shows a controlled transformer tap as used in
the Agilent E3631A. This is one of several techniques using semiconductors for
preregulation to reduce the power dissipated across the series element.
7
143
Chapter 7 Tutorial
Overview of Agilent E3631A Operation
In terms of performance, linear regulated supplies have a very precise regulating
properties and respond quickly to variations of the line and load. Hence, their line
and load regulation and transient recovery time are superior to supplies using other
regulation techniques. These supplies also exhibit low ripple and noise, are tolerant
of ambient temperature changes, and with their circuit simplicity, have a high
reliability.
The Agilent E3631A contains three linear regulated power supplies. Each is
controlled by a control circuit that provides voltages to program the outputs. Each
supply sends back to the control circuit voltages representing outputs at the terminals.
The control circuits receive information from the front panel and send information to
the display. Similarly the control circuits “talk” to the remote interface for input and
output with the GPIB and RS-232 interfaces.
Figure 7-2. Block Diagram of the Three Supplies Showing the Isolation
The control circuit and display circuit share the same common ground as the ±25V
supplies. The remote interface is at earth ground and isolated from the control circuit
and the ±25V supplies. The +6V supply is also isolated from the remote interface and
the ±25V supplies.
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Chapter 7 Tutorial
Output Characteristics
Output Characteristics
An ideal constant-voltage power supply would have a zero output impedance
at all frequencies. Thus, as shown in Figure 7-3, the voltage would remain perfectly
constant in spite of any changes in output current demanded by the load.
Figure 7-3. Ideal Constant Voltage
Power Supply
Figure 7-4. Ideal Constant Current
Power Supply
The ideal constant-current power supply exhibits an infinite output impedance at all
frequencies. Thus as Figure 7-4 indicates, the ideal constant-current power supply
would accommodate a load resistance change by altering its output voltage by just
the amount necessary to maintain its output current at a constant value.
Each of the three Agilent E3631A power supply outputs can operate in either constantvoltage (CV) mode or constant-current (CC) mode. Under certain fault conditions,
the power supply cannot operate in either CV or CC mode and becomes
unregulated.
7
145
Chapter 7 Tutorial
Output Characteristics
Figure 7-5 shows the operating modes of the three outputs of the Agilent E3631A
power supply. The operating point of one supply will be either above or below the
line RL = RC. This line represents a load where the output voltage and the output
current are equal to the voltage and current setting. When the load RL is greater than
RC, the output voltage will dominate since the current will be less then the current
setting. The power supply is said to be in constant-voltage mode. The load at point 1
has a relatively high resistance value (compared to RC), the output voltage is at the
voltage setting, and the output current is less than the current setting. In this case the
power supply is in the constant-voltage mode and the current setting acts as a current
limit.
Figure 7-5. Output Characteristics
When the load RL is less than RC, the output current will dominate since the voltage
will be less than the set voltage. The power supply is said to be in constant-current
mode. The load at point 2 has a relatively low resistance, the output voltage is less
than the voltage setting, the output current is at the current setting. The supply is in
constant-current mode and the voltage setting acts as a voltage limit.
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Chapter 7 Tutorial
Output Characteristics
Unregulated State
If the power supply should go into a mode of operation that is neither CV or CC, the
power supply is unregulated. In this mode the output is not predictable. The
unregulated condition may be the result of the ac line voltage below the specifications.
The unregulated condition may occur momentarily. For example when the output is
programmed for a large voltage step; the output capacitor or a large capacitive load
will charge up at the current limit setting. During the ramp up of the output voltage
the power supply will be in the unregulated mode. During the transition from CV to
CC as when the output is shorted, the unregulated state may occur briefly during the
transition.
Unwanted Signals
An ideal power supply has a perfect dc output with no signals across the terminals or
from the terminals to earth ground. The actual power supply has finite noise across
the output terminals, and a finite current will flow through any impedance connected
from either terminal to earth ground. The first is called normal mode voltage noise
and the second common mode current noise.
Normal mode voltage noise is in the form of ripple related to the line frequency plus
some random noise. Both of these are of very low value in the Agilent E3631A.
Careful lead layout and keeping the power supply circuitry away from power devices
and other noise sources will keep these values low.
Common mode noise can be a problem for very sensitive circuitry that is referenced
to earth ground. When a circuit is referenced to earth ground, a low level line--related
ac current will flow from the output terminals to earth ground. Any impedance to
earth ground will create a voltage drop equal to the current flow multiplied by the
impedance. To minimize this effect, the output terminal can be grounded at the output
terminal. Alternately, any impedances to earth ground should have a complementary
impedance to earth ground to cancel any generated voltages. If the circuit is not
referenced to earth ground, common mode power line noise is typically not
a problem.
The output will also change due to changes in the load. As the load increases the
output current will cause a small drop in the output voltage of the power supply
due to the output impedance R. Any resistance in the connecting wire will add to
this resistance and increase the voltage drop. Using the largest possible hook up
wire will minimize the voltage drop.
147
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Chapter 7 Tutorial
Output Characteristics
Figure 7-6. Simplified Diagram of Common Mode and Normal Mode Sources of
Noise
When the load changes very rapidly, as when a relay contact is closed, the inductance
in the hook up wire and in the power supply output will cause a spike to appear at the
load. The spike is a function of the rate of change of the load current. When very rapid
changes in load are expected, a capacitor with a low series resistance, in parallel with
the power supply, and close to the load is the best way to minimize these voltage
spikes.
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Chapter 7 Tutorial
Connecting the Load
Connecting the Load
Output Isolation
The outputs of all three power supplies are isolated from earth ground. Any output
terminal may be grounded, or an external voltage source may be connected between
any terminal output and ground. However, output terminals must be kept within ±240
Vdc of ground. The ± 25V supplies are tied together at one common terminal. Any
one of the three terminals can be tied to ground as needed. An earth ground terminal
is provided on the front panel for convenience.
Multiple Loads
When connecting multiple loads to the power supply, each load should be connected
to the output terminals using separate connecting wires. This minimizes mutual
coupling effects between loads and takes full advantage of the low output impedance
of the power supply. Each pair of wires should be as short as possible and twisted or
shielded to reduce lead inductance and noise pick-up. If a shield is used, connect one
end to the power supply ground terminal and leave the other end disconnected.
If cabling considerations require the use of distribution terminals that are located
remotely from the power supply, connect output terminals to the distribution terminals
by a pair of twisted or shielded wires. Connect each load to the distribution terminals
separately.
Table 7-1. Wire Rating
AWG
10
12
14
16
18
20
22
24
26
28
Suggested
maximum
Current(amps)*
40
25
20
13
10
7
5
3.5
2.5
1.7
mΩ/ft
1.00
1.59
2.53
4.02
6.39
10.2
16.1
25.7
40.8
64.9
mΩ/m
3.3
5.2
8.3
13.2
21.0
33.5
52.8
84.3
133.9 212.9
*Single conductor in free air at 30 °C with insulation
Warning
7
To satisfy safety requirements, load wires must be heavy enough not to overheat
while carrying the short-circuit output current of the power supply.
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Chapter 7 Tutorial
Connecting the Load
Load Consideration
Capacitive Loading
In most cases, the power supply will be stable for almost any size load capacitance.
Large load capacitors may cause ringing in the power supply's transient response. It
is possible that certain combinations of load capacitance, equivalent series resistance,
and load lead inductance will result in instability. If this occurs, the problem may often
be solved by either increasing or decreasing the total load capacitance.
A large load capacitor may cause the power supply to cross into CC or unregulated
mode momentarily when the output voltage is reprogrammed. The slew rate of the
output voltage will be limited to the current setting divided by the total load
capacitance (internal and external).
Table 7-2. Slew Rate
AWG
Internal
Capacitance
Internal Bleed
Resistor
Slew Rate at No Load and
Full Scale Current Setting
+6V Output
1000 μF
390 Ω
8 V/msec
+25V Output
470 μF
5 kΩ
1.5 V/msec
-25V Output
470 μF
5 KΩ
1.5 V/msec
Inductive loading
Inductive loads present no loop stability problems in constant voltage mode. In
constant current mode, inductive loads form a parallel resonance with the power
supply’s output capacitor. Generally this will not affect the stability of the power
supply, but it may cause ringing of the current in the load.
Pulse Loading
In some applications the load current varies periodically from a minimum to a
maximum value. The constant current circuit limits the output current. Some peak
loading exceeding the current limit can be obtained due to the output capacitor. To
stay within the specifications for the output, the current limit should be set greater
than the peak current expected or the supply may go into CC mode or unregulated
mode for brief periods.
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Chapter 7 Tutorial
Connecting the Load
Reverse Current Loading
An active load connected to the supply may actually deliver a reverse current to the
supply during a portion of its operating cycle. An external source cannot be allowed
to pump current into the supply without risking loss of regulation and possible
damage. These effects can be avoided by preloading the output with a dummy load
resistor. The dummy load resistor should draw at least the same amount of current
from the supply as the active load may deliver to the supply. The value of the current
for the dummy load plus the value of the current the load draws from the supply must
be less than the maximum current of the supply.
7
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Chapter 7 Tutorial
Extending the Voltage
Extending the Voltage
The power supply may be able to provide voltages greater than its rated maximum
outputs if the power-line voltage is at or above its nominal value. Operation can be
extended up to 3% over the rated output without damage to the power supply, but
performance cannot be guaranteed to meet specifications in this region. If the powerline voltage is maintained in the upper end of the input voltage range, the power supply
will probably operate within its specifications. The power supply is more likely to
stay within specifications if only one of the voltage or current outputs is exceeded.
Series Connections
Series operation of two or more power supplies can be accomplished up to the output
isolation rating (240 Vdc) of any one supply to obtain a higher voltage than that
available from a single supply. Series connected power supplies can be operated with
one load across both power supplies or with a separate load for each power supply.
The power supply has a reverse polarity diode connected across the output terminals
so that if operated in series with other power supplies, damage will not occur if the
load is short-circuited or if one power supply is turned on separately from its series
partners.
When series connection is used, the output voltage is the sum of the voltages of the
individual power supplies. The current is the current of any one power supply. Each
of the individual power supplies must be adjusted in order to obtain the total output
voltage.
In the Agilent E3631A the two 25V supplies can be operated in series to obtain
one 0 - 50V supply. The power supply can be put in “Track” mode and then the output
will be twice that shown on the front panel. The current will be that of either the +
25V supply or the -25V supply.
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Chapter 7 Tutorial
Remote Programming
Remote Programming
During remote programming a constant-voltage regulated power supply is called upon
to change its output voltage rapidly. The most important factor limiting the speed of
output voltage change is the output capacitor and load resistor.
Figure 7-7. Speed of Response - Programming Up (Full Load)
The equivalent circuit and the nature of the output voltage waveform when the supply
is being programmed upward are shown in Figure 7-7. When the new output is
programmed, the power supply regulator circuit senses that the output is less than
desired and turns on the series regulator to its maximum value IL, the current limit or
constant current setting.
This constant current IL charges the output capacitor CO and load resistor RL parallel.
The output therefore rises exponentially with a time constant RLCL towards voltage
level IL RL, a value higher than the new output voltage being programmed.
When this exponential rise reaches the newly programmed voltage level, the
constant voltage amplifier resumes its normal regulating action and holds the output
constant. Thus, the rise time can be determined approximately using the formula
shown in Figure 7-7.
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Chapter 7 Tutorial
Remote Programming
If no load resistor is attached to the power supply output terminal, then the output
voltage will rise linearly at a rate of CO/IL when programmed upward, and
TR = CO(E2-E1)/IL, the shortest possible up-programming time.
Figure 7-8. Speed of Response -Programming Down
Figure 7-8 shows that when the power supply is programmed down, the regulator
senses that the output voltage is higher than desired and turns off the series transistors
entirely. Since the control circuit can in no way cause the series regulator transistors
to conduct backwards, the output capacitor can only be discharged through the load
resistor and internal current source (IS).
The output voltage decays linearly with slope of IS/CO with no load and stops falling
when it reaches the new output voltage which has been demanded. If full load is
connected, the output voltage will fall exponentially faster.
Since up-programming speed is aided by the conduction of the series regulating
transistor, while down programming normally has no activeelement aiding in the
discharge of the output capacitor, laboratory power supplies normally program
upward more rapidly than downward.
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Chapter 7 Tutorial
Reliability
Reliability
Reliability of electronic semiconductor equipment depends heavily on the
temperature of the components. The lower the temperature of the components, the
better the reliability. The Agilent E3631A incorporates circuitry to reduce the internal
power dissipation of the power supply and therefore reduce the internal heat of the
power supply. Maximum internal power dissipation occurs at maximum current. The
internal power dissipation further increases as the output voltage is lowered. A fan
internal to the Agilent E3631A is essential to keep internal temperatures low. To assist
in cooling the Agilent E3631A the sides and rear of the Agilent E3631A should be
kept clear.
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8
Specifications
8
Specifications
The performance specifications are listed in the following pages. Specifications are
warranted in the temperature range of 0 to 40 °C with a resistive load. Supplemental
characteristics, which are not warranted but are descriptions of performance
determined either by design or testing. The service guide contains procedures for
verifying the performance specifications. All specifications apply to three outputs
unless otherwise specified.
158
Chapter 8 Specifications
Performance Specifications
Performance Specifications
Output Ratings (@ 0 °C - 40 °C)
+6V Output
+25V Output
-25V Output
0 to +6 V ; 0 to 5 A
0 to +25 V ; 0 to 1 A
0 to -25 V ; 0 to 1 A
Programming Accuracy[1] 12 months (@ 25 °C ± 5 °C), ±(% of output + offset)
Voltage
Current
+6V Output
0.1% + 5 mV
0.2% + 10 mA
+25V Output
0.05% + 20 mV
0.15% + 4 mA
-25V Output
0.05% + 20 mV
0.15% + 4 mA
Readback Accuracy[1] 12 months (over GPIB and RS-232 or front panel with
respect to actual output @ 25 °C ± 5°C), ±(% of output + offset)
Voltage
Current
+6V Output
0.1% + 5 mV
0.2% + 10 mA
+25V Output
0.05% + 10 mV
0.15% + 4 mA
-25V Output
0.05% + 10 mV
0.15% + 4 mA
Ripple and Noise (with outputs ungrounded, or with either output terminal
grounded, 20 Hz to 20 MHz)
Voltage
Current
+6V Output
<0.35 mV rms
<2 mV p-p
<2 mA rms
Common mode current
+25V Output
<0.35 mV rms
<2 mV p-p
<500 μA rms
-25V Output
<0.35 mV rms
<2 mV p-p
<500 μA rms
<1.5 μA rms
Load Regulation, ±(% of output + offset)
Change in output voltage or current for any load change within ratings
Voltage
Current
<0.01% + 2 mV
<0.01% + 250 μA
Line Regulation, ±(% of output + offset)
Change in output voltage and current for any line change within ratings
Voltage
Current
[1]
<0.01% + 2 mV
<0.01% + 250 μA
Accuracy specifications are after an 1-hour warm-up and calibration at 25 °C.
159
8
Chapter 8 Specifications
Performance Specifications
Programming Resolution
Voltage
Current
+6V Output
0.5 mV
0.5 mA
+25V Output
1.5 mV
0.1 mA
-25V Output
1.5 mV
0.1 mA
+25V Output
1.5 mV
0.1 mA
-25V Output
1.5 mV
0.1 mA
+25V Output
10 mV
1 mA
-25V Output
10 mV
1 mA
Readback Resolution
Voltage
Current
+6V Output
0.5 mV
0.5 mA
Meter Resolution
Voltage
Current
+6V Output
1 mV
1 mA
Transient Response Time
Less than 50 μsec for output recover to within 15 mV following a change in output
current from full load to half load or vice versa
Command Processing Time
Programming Commands : Maximum time for output to change after receipt of
APPLy and SOURce commands) : <50 msec
Readback Command : Maximum time to readback output by MEASure? command :
<100 msec
The Other Commands : < 50 msec
Tracking Accuracy
The ±25V outputs track each other within ±(0.2% of output + 20 mV).
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Chapter 8 Specifications
Supplemental Characteristics
Supplemental Characteristics
Output Programming Range (maximum programmable values)
Voltage
Current
+6V Output
0 to 6.18 V
0 to 5.15 A
+25V Output
0 to 25.75 V
0 to 1.03 A
-25V Output
0 to -25.75 V
0 to 1.03 A
Temperature Coefficient, ±(% of output + offset)
Maximum change in output/readback per °C after a 30-minute warm-up
+25V Output
-25V Output
+6V Output
Voltage
0.01% + 2 mV
0.01% + 3 mV
0.01% + 3 mV
Current
0.02% + 3 mA
0.02% + 0.5 mA
0.02% + 0.5 mA
Stability, ±(% of output + offset)
Following a 30-minute warm-up, with the output in the ON state according to the
operating mode (CC with load or CV), and with a change in the output over 8 hours
under constant load, line, and ambient temperature
Voltage
Current
+6V Output
0.03% + 1 mV
0.1% + 3 mA
+25V Output
0.02% + 2 mV
0.05% + 1 mA
-25V Output
0.02% + 2 mV
0.05% + 1 mA
Voltage Programming Speed
Maximum time required for output voltage to settle within 1% of its total excursion
(for resistive load). Excludes command processing time.
Full load Up
Full load Down
+6V Output
11 msec
13 msec
+25V Output
50 msec
45 msec
-25V Output
50 msec
45 msec
No load Up
No load Down
10 msec
200 msec
20 msec
400 msec
20 msec
400 msec
Isolation
The 0-6V supply is isolated from the ±25V supply up to ±240 Vdc. Maximum
isolation voltage from any terminal to chassis ground ±240 Vdc.
AC Input Ratings (selectable via rear panel selector)
std
opt 0E3
opt 0E9
115 Vac ± 10%, 47 to 63 Hz, 350 VA Max
230 Vac ± 10%, 47 to 63 Hz, 350 VA Max
100 Vac ± 10%, 47 to 63 Hz, 350 VA Max
161
8
Chapter 8 Specifications
Supplemental Characteristics
Cooling
Fan cooled
Operating Temperature
0 to 40 °C for full rated output. At higher temperatures, the output current is derated
linearly to 50% at 55 °C maximum temperature.
Output Voltage Overshoot
During turn-on or turn-off of ac power, output plus overshoot will not exceed 1 V if the
output control is set to less than 1 V. If the output control is set to 1 V or higher, there
is no overshoot.
Programming Language
SCPI (Standard Commands for Programmable Instruments)
State Storage Memory
Three (3) user-configurable stored states
Recommended Calibration Interval
1 year
Dimensions*
212.6 mmW x 132.6 mmH x 348.2 mmD (8.4 x 5.2 x 13.7 in)
*See the next page for detailed information.
Weight
Net
Shipping
162
8.2 kg (18 lb)
11 kg (24 lb)
Chapter 8 Specifications
Supplemental Characteristics
Figure 8-1. Dimensions of Agilent E3631A Power Supply
163
8
THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
164
Index
A
accessories 18
active load 151
adapter kit, Agilent 34399A 57
address, GPIB bus controller 50
address,GPIB 51
annunciators 6
application program 128
APPLy command 129
asterisk 107
B
C
cable
crossover 57
DTE-to-DTE interface 57
modem-eliminator 57
null-modem 57
cable kit, Agilent 34398A 57
calibration
Changing security code 63
count 64
error 124
message 64
secure 62
security 60
security code 60
unsecure 61
calibration command 87
calibration error 124
character frame 56
chassis ground 20
colon 104
comma 105
command
*CLS 102
*ESE 102
*IDN? 85
*OPC 99, 102
*PSC 102
*PSC? 102
*RCL 86
common command 107
common terminal 20
configuration, remote interface 50
connection
series 152
connector, GPIB 55
constant current operation 40
constant voltage amplifier 153
constant voltage operation 38
constant-current mode 145
constant-voltage mode 145
control circuit 144
cooling 21
coupling effect 149
current limit 39, 146
current meter 20
Current Output Checkout 33
current settings 5
Index
basic tests
output checkout 31
power-on self-test 30
preliminary checkout 29
baud rate 51, 56
binding posts 20
brace 67, 105
bus controller, interrupt 98
*RST 86
*SAV 86
*SRE 103
*SRE? 103
*STB? 98, 103
*TRG 83
*TST? 86
*WAI 103
APPLy 75
APPLy? 75
CALibration:COUNt? 87
CALibration:CURRent 87
CALibration:CURRent:LEVel 87
CALibration:SECure:CODE 87
CALibration:SECure:STATe 88
CALibration:SECure:STATe? 88
CALibration:STRing 88
CALibration:STRing? 88
CALibration:VOLTage 88
CALibration:VOLTage:LEVel 88
CURRent 79
CURRent:TRIGgered 80
CURRent? 79
DISPlay 84
DISPlay:TEXT 84
DISPlay:TEXT:CLEar 84
DISPlay:TEXT? 84
DISPlay? 84
INSTrument 76
INSTrument:COUPle 77
INSTrument:NSELect 76
INSTrument? 76
MEASure:CURRent? 78
MEASure:VOLTage? 78
OUTPut 79
OUTPut? 79
SYSTem:BEEPer 84
SYSTem:ERRor? 85, 100
SYSTem:LOCal 89
SYSTem:REMote 89
SYSTem:RWLock 89
SYSTem:VERSion? 85
TRACk 79
TRIGger:DELay 83
TRIGger:DELay? 83
TRIGger:SOURce 83
TRIGger:SOURce? 83
VOLTage 80
VOLTage:TRIGgered 80
VOLTage? 80
command Format 105
command separator 106
command syntax 105
command terminator 107
D
data Frame 56
deadlock 59
device-specific commands 112
disable output 79
disable outputs 45
display annunciators 6
display control 48
distribution terminal 149
down programming speed 154
DSR 58
DTE 57
DTR 58
DTR/DSR handshake protocol 58
dummy load resistor 151
E
enable output 79
enable outputs 45
enable register 90
error 116
execution 117
self-test 123
error conditions 47
error message 116
error queue 116
event register 90
execution error 117
external voltage source 149
F
feedback control 143
165
Index
firmware revision query 49
front panel
drawing 3
enabled / disable 48
key discription 4
voltage and current settings 5
front panel message 48
fuse rating 29
G
GPIB address 51
GPIB connector 55
GPIB interface 50
GPIB interface configuration 55
H
Index
halting an output 109
I
idea constant-current supplies 145
ideal constant-voltage supplies 145
identifier 74
IEEE-488 common command 107
IEEE-488 conformance information 113
initial inspection 21
input power 24
installation 21
interface, GPIB 50
interface, RS-232 50
linear power supplies 143
load
active 151
capacitive loading 150
inductive loading 150
pulse loading 150
reverse current loading 151
locking knob control 45
loop stability 150
low-level command 72, 133
M
MAV bit 98
MAX parameter 106
measurement command 78
memory location 43, 86
messge
CAL MODE 61
meter mode 19, 37
meters 20
MIN parameter 106
multiple loads 149
N
noise
common mode current 147
normal mode voltage 147
non-SCPI command 112
O
operating range 152
options 18
output buffer 96, 99
output characteristics 145
output identifier 74
output impedance 145
output isolation 149
output name 74
output number 74
output on/off command 79
output selection command 76
output setting command 76
K
key
Calibrate 61
Display Limit 37
I/O Config 7
Local 37
On/Off 45
Secure 61
Track 42
key descriptions 4
keyword
root 104
second-level 104
third-level 104
knob locking 45
P
parameter
boolean 108
discrete 108
numeric 108
string 108
parity 51, 53, 56
L
limit mode 19, 37
limit value 37
166
performance specifications 158
power dissipation 155
power-line cord 24
power-line voltage selection 24
power-on / reset state 30, 33, 38, 40
preregulation 143
program 128
programming range 74
programming speed 153
down 154
up 153
protocol, DTR/DSR handshake 58
Q
query 73, 107
query command 73
query response 73
questionable status register 93
R
rack mounting 22
rack mounting kit
adapter kit 22
filler panel 23
flange kit 23
lock-link kit 23
shelf 23
slide kit 23
sliding support shelf 23
readback capabilities 19
rear panel
drawing 7
recall mode 44
recalling operating states 43
rectifier 143
register
questionable status 93
questionable status enable 94
questionable status event 94
standard event 95
standard event enable 96
status byte 96, 98
status byte enable 97
status byte summary 97
register, enable 90
register, event 90
reliability 155
remote interface configuration 50
reverse polarity diode 152
RS-232 interface 50
RS-232 interface commands 89
RS-232 interface configuration 56
Index
RS-232 operation 139
Š™
T
temperature range 21
track mode 42
tracking operation 42
transformer tap 143
tree system 104
triangle bracket 67, 105
trigger source 73
triggering command 81
troubleshooting, RS-232 59
U
unregulated condition 147
unregulated state 147
unwanted signals 147
up programming speed 153
V
vacuum-fluorescent display 19
vertical bar 67
VFD 19
VOLTage 80
voltage limit 41, 146
voltage meter 20
voltage output checkout 31
voltage setting 5
voltage spike 148
voltmeter 31
Index
safety and EMC requirements 17
safety consideration 17
SCPI command summary 67
SCPI command terminator 107
SCPI confirmed command 110
SCPI conformance 110
SCPI language 104
SCPI parameter 108
SCPI status register 90
SCPI version 49
SCPI version query 49
self-test 46
self-test error 123
semicolon 106
series connection 152
series regulated power supplies 143
series resistance 143
service request 97
set the baud rate 53
setting GPIB address 52
setting parity 53
slew rate 150
specifications 158
square bracket 67, 105
stability 150
standard event register 95
start bit 56
status byte register 96
status register 90, 137
status registers 90, 137
status reporting command 100
stop bit 56
storage mode 43
storing operating states 43
subsystem 104
supplemental characteristics 158, 161
system-related commands 84
W
wiring adapter 57
167
Index
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168
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Manual Part Number: E3631-90002
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Safety Symbols
Warning
Calls attention to a procedure,
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Caution
Calls attention to a procedure,
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Warning
No operator serviceable parts
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Warning
For continued protection
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Caution, risk of danger (refer
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Direct current (DC)
Alternating current (AC)
Protective conductor terminal
Out position of a bi-stable push
control
In position of a bi-stable push
control
Earth (ground) terminal
Positive binding post
Negative binding post
Frame or chasis terminal
Eighth Edition, April 21, 2014
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