Agilent N5741A Users Guide

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Agilent Technologies System DC Power Supply

Series N5700

User’s Guide

A A

Legal Notices

No part of this document may be photocopied, reproduced, or translated to another language without the prior agreement and written consent of Agilent Technologies, Inc. as governed by United States and international copyright laws.

Warranty

The material contained in this document is provided “as is,” and is subject to being changed, without notice, in future editions. Further, to the maximum extent permitted by applicable law, Agilent disclaims all warranties, either express or implied, with regard to this manual and any information contained herein, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. Agilent shall not be liable for errors or for incidental or consequential damages in connection with the furnishing, use, or performance of this document or of any information contained herein. Should Agilent and the user have a separate written agreement with warranty terms covering the material in this document that conflict with these terms, the warranty terms in the separate agreement shall control.

Manual Editions

Manual Part Number: 5969-2917 Edition 5, May, 2006 Printed in Malaysia.

Reprints of this manual containing minor corrections and updates may have the same printing date. Revised editions are identified by a new printing date.

Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC

This product complies with the WEEE Directive 2002/96/EC) marketing requirement. The affixed product label (see below) indicates that you must not discard this electrical/electronic product in domestic household waste.

Product Category: With reference to the equipment types in the WEEE directive Annex 1, this product is classified as “Monitoring and Control instrumentation” product.

Do not dispose in domestic household waste.

To return unwanted products, contact our local Agilent office, or see

www.agilent.com/environment/product

for more information.

Certification

Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory. Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology, to the extent allowed by the Institute's calibration facility, and to the calibration facilities of other International Standards Organization members.

Exclusive Remedies

THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER'S SOLE AND EXCLUSIVE REMEDIES. AGILENT TECHNOLOGIES SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

Assistance

This product comes with the standard product warranty. Warranty options, extended support contacts, product maintenance agreements and customer assistance agreements are also available. Contact your nearest Agilent Technologies Sales and Service office for further information on Agilent Technologies' full line of Support Programs.

Technologies Licenses

The hardware and or software described in this document are furnished under a license and may be used or copied only in accordance with the terms of such license.

Restricted Rights Legend

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Trademarks

Microsoft and Windows are U.S. registered trademarks of Microsoft Corporation.

2 Series N5700 User’s Guide

Safety Notices

The following general safety precautions must be observed during all phases of operation of this instrument. Failure to comply with these precautions or with specific warnings or instructions elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Agilent Technologies assumes no liability for the customer's failure to comply with these requirements.

General

Do not use this product in any manner not specified by the manufacturer. The protective features of this product may be impaired if it is used in a manner not specified in the operation instructions.

Before Applying Power

Verify that all safety precautions are taken. Make all connections to the unit before applying power. Note the instrument's external markings described under "Safety Symbols"

Ground the Instrument

This product is a Safety Class 1 instrument (provided with a protective earth terminal). To minimize shock hazard, the instrument chassis and cover must be connected to an electrical ground. The instrument must be connected to the ac power mains through a grounded power cable, with the ground wire firmly connected to an electrical ground (safety ground) at the power outlet. Any interruption of the protective (grounding) conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury.

Fuses

The instrument contains an internal fuse, which is not customer accessible.

Do Not Operate in an Explosive Atmosphere

Do not operate the instrument in the presence of flammable gases or fumes.

Do Not Remove the Instrument Cover

Only qualified, service-trained personnel who are aware of the hazards involved should remove instrument covers. Always disconnect the power cable and any external circuits before removing the instrument cover.

Do Not Modify the Instrument

Do not install substitute parts or perform any unauthorized modification to the product. Return the product to an Agilent Sales and Service Office for service and repair to ensure that safety features are maintained.

In Case of Damage

Instruments that appear damaged or defective should be made inoperative and secured against unintended operation until they can be repaired by qualified service personnel

CAUTION

A CAUTION notice denotes a hazard. It calls attention to an operating procedure, practice, or the like that, if not correctly performed or adhered to, could result in damage to the product or loss of important data. Do not proceed beyond a CAUTION notice until the indicated conditions are fully understood and met.

WARNING

A WARNING notice denotes a hazard. It calls attention to an operating procedure, practice, or the like that, if not correctly performed or adhered to, could result in personal injury or death. Do not proceed beyond a WARNING notice until the indicated conditions are fully understood and met.

Safety Symbols

Direct current

Alternating current

Both direct and alternating current

Three phase alternating current

Earth (ground) terminal

Protective earth ground terminal.

Frame or chassis terminal

Terminal is at earth potential.

Neutral conductor on permanently installed equipment

Line conductor on permanently installed equipment.

On supply

Off supply

Standby supply. Unit is not completely disconnected from ac mains when switch is off

In position of a bi-stable push switch

Out position of a bi-stable push switch

Caution, risk of electric shock

Caution, hot surface

Caution, refer to accompanying documents

Series N5700 User’s Guide 3

In this Book

This User’s Manual contains the operating instructions, installation instructions, and specifications of the Agilent Technologies Series N5700 750W and 1500W System DC Power Supplies. Specific chapters in this manual contain the following information:

 Quick Reference – Chapter 1 is a quick reference section that

helps you quickly become familiar with your Agilent N5700 power supply.

 Installation – Chapter 2 describes how to install your power

supply. It describes how to connect various loads to the output. It discusses remote sensing as well as parallel and series operation.

 Operating the Power Supply Locally – Chapter 3 describes how to

operate the power supply from the front panel and from the analog connector on the rear panel. It also includes a turn-on check-out procedure to verify the unit is operating properly.

 Operating the Power Supply Remotely – Chapter 4 describes how

to configure the remote interfaces. It also gives a brief overview of the SCPI command structure and basic programming concepts.

 Language Reference – Chapter 5 describes all of the SCPI

programming commands.

 Programming Examples – Chapter 6 provides Visual BASIC

example programs that illustrate some common applications.

NOTE

 Specifications – Appendix A describes specifications and

supplemental characteristics.

 Verification and Calibration Procedures – Appendix B explains

the verification and calibration procedures.

 Service – Appendix C describes what to do if your unit requires

service.

 Compatibility – Appendix D documents the compatibility

commands of the Agilent 603xA power supplies that are supported by the Agilent N5700 power supplies.

You can contact Agilent Technologies at one of the following telephone numbers for warranty, service, or technical support information. In the United States: (800) 829-4444 In Europe: 31 20 547 2111 In Japan: 0120-421-345 Or use our Web link for information on contacting Agilent in your country or specific location: www.agilent.com/find/assist Or contact your Agilent Technologies Representative.

The web contains the most up to date version of the manual. Go to

http://www.agilent.com/find/N5700

to get the latest version of the manual.

4 Series N5700 User’s Guide

Contents

1 Quick Reference

The Agilent N5700 DC Power Supplies – At a Glance ................................. 8

The Front Panel - At a Glance......................................................................... 10

The Rear Panel – At a Glance.........................................................................12

2 Installation

General Information.......................................................................................... 16

Inspecting the Unit ........................................................................................... 17

Installing the Unit..............................................................................................17

Connecting the Line Cord ................................................................................ 19

Connecting the Load.........................................................................................21

Output Voltage Sensing................................................................................... 24

Load Considerations.........................................................................................26

Parallel Connections.........................................................................................28

Series Connections........................................................................................... 30

J1 Connector Connections ..............................................................................32

3 Operating the Power Supply Locally

Turn-On Check-Out........................................................................................... 34

Normal Operation.............................................................................................. 36

Protection Functions ........................................................................................ 37

Output On/Off Controls....................................................................................40

Analog Programming of Output Voltage and Current.................................42

4 Operating the Power Supply Remotely

Connecting to the Interfaces ..........................................................................48

SCPI Commands – an Introduction................................................................ 58

5 Language Reference

SCPI Command Summary................................................................................ 64

Calibration Commands..................................................................................... 66

Measure Commands.........................................................................................67

Output Commands ............................................................................................ 68

Source Commands............................................................................................ 69

Status Commands............................................................................................. 71

System Commands ........................................................................................... 77

Trigger Commands............................................................................................ 79

Series N5700 User’s Guide 5

6 Programming Examples

Output Programming Example........................................................................ 82

Trigger Programming Example........................................................................ 84

Appendix A Specifications

Performance Specifications............................................................................ 88

Supplemental Characteristics.........................................................................89

Outline Diagram.................................................................................................91

Appendix B Verification and Calibration

Verification......................................................................................................... 94

Calibration ........................................................................................................113

Appendix C Service

Types of Service Available.............................................................................116

Repackaging for Shipment.............................................................................116

Operating Checklist.........................................................................................116

Error Messages ...............................................................................................118

Appendix D Compatibility

Differences – In General................................................................................ 124

Compatibility Command Summary............................................................... 125

Index ...........................................................................................................................................................127

6 Series N5700 User’s Guide

1 Quick Reference

The Agilent N5700 DC Power Supplies – At a Glance ................................. 8

The Front Panel - At a Glance......................................................................... 10

The Rear Panel – At a Glance......................................................................... 12

This chapter concisely describes the Agilent Technologies Series N5700 Power Supplies.

This chapter is not meant to describe every operating feature in detail. It is simply a quick reference guide to quickly become familiar with the essential components of the power supply. It can also be used as a memory jogger for experienced users to quickly find a front/rear panel function.

A quick reference programming command chart is included in the beginning of chapter 5.

Series N5700 User’s Guide 7

1 Quick Reference

The Agilent N5700 DC Power Supplies – At a Glance

The Agilent Technologies Series N5700 System DC Power Supplies are general-purpose, 1U (rack unit) high, switching power supplies that are available with a wide variety of output voltage and current ratings.

These power supplies are power-factor corrected and operate from a worldwide AC voltage range. Output voltage and current are continuously displayed and LED indicators show the complete operating status of the power supply.

The front panel controls allow the user to set the output parameters, over-voltage, under-voltage, and over-current protection levels, and preview the settings.

The rear panel includes the necessary connectors to control and monitor the power supply operation by analog signals or by the builtin remote communication interfaces.

Output Features

System Features

• Constant voltage/constant current with automatic crossover.

• High-resolution voltage and current front panel controls.

• Accurate voltage and current readback.

• Independent edge-triggered external shut-off, and level-

triggered external enable/disable.

• Parallel master/slave operation with active current sharing.

• Remote sensing to compensate for voltage drop in load leads.

• Analog output programming and monitoring.

• Built-in GBIB/LAN/USB interface.

• A built-in Web server that lets you control the instrument

directly from an internet browser on your computer.

• Zero-gap stacking - no ventilation holes at the top and bottom surface of the power supply.

• Universal input voltage with active power factor correction.

• Fan speed control for low noise and extended fan life.

8 Series N5700 User’s Guide

Programmable Functions

• Output voltage and current setting.

• Output voltage and current measurement.

• Output voltage and current trigger setting.

• Output On/Off control.

• Over-current protection setting.

• Over-voltage protection setting and readback.

• Under-voltage limit setting and readback.

• Start-up mode (either last setting or reset mode)

• Status register setting and readback.

• Bus trigger

• Calibration

Model Ratings

Quick Reference 1

Model Voltage

Range

N5741A 0 – 6V 0 – 100A N5761A 0 – 6V 0 – 180A

N5742A 0 – 8V 0 – 90A N5762A 0 – 8V 0 – 165A

N5743A 0 – 12.5V 0 – 60A N5763A 0 – 12.5V 0 – 120A

N5744A 0 – 20V 0 – 38A N5764A 0 – 20V 0 – 76A

N5745A 0 – 30V 0 – 25A N5765A 0 – 30V 0 – 50A

N5746A 0 – 40V 0 – 19A N5766A 0 – 40V 0 – 38A

N5747A 0 – 60V 0 – 12.5A N5767A 0 – 60V 0 – 25A

N5748A 0 – 80V 0 – 9.5A N5768A 0 – 80V 0 – 19A

N5749A 0 – 100V 0 – 7.5A N5769A 0 – 100V 0 – 15A

N5750A 0 – 150V 0 – 5A N5770A 0 – 150V 0 – 10A

N5751A 0 – 300V 0 – 2.5A N5771A 0 – 300V 0 – 5A

N5752A 0 – 600V 0 – 1.3A N5772A 0 – 600V 0 – 2.5A

Minimum output voltage is ≤ 0.2% of the rated output voltage. Minimum output current is ≤ 0.4% of the rated output current.

Current Range

Model Voltage

Range

Current Range

Series N5700 User’s Guide 9

1 Quick Reference

The Front Panel - At a Glance

LIMIT/

OVP

OCP/488 LAN OUT ON

UVL

DC AMPS

POWER

VOLTAGE

DC VOLTS

CV CC

PROT FINE

1 – VOLTAGE knob Voltage function

: Adjusts the output voltage, the over-voltage protection level, and the under-voltage limit. If over-voltage protection or under-voltage limits have been set, you cannot program the output voltage outside those limits.

GPIB address

: Selects the GPIB address when OCP/488 is pressed and held.

2 – CV indicator When lit, indicates that the unit is operating in constant voltage mode – with the

output voltage being held constant.

CURRENT

3 – DC VOLTS display LED display that normally displays the voltage measured at the sense terminals.

When LIMIT is pressed, the display indicates the programmed voltage setting. When OVP/UVL is pressed, the display indicates either the OVP or UVL setting. When OCP/488 is pressed and held, the display indicates the GPIB address. When LAN is pressed and held, the display indicates the IP and Ethernet address.

4 – DC AMPS display LED display that normally displays the current measured at the output terminals.

When LIMIT is pressed, the display indicates the programmed current setting. When LAN is pressed and held, the display indicates the IP and Ethernet address.

5 – CC indicator When lit, indicates that the unit is operating in constant current mode – with the

output current being held constant.

6 – CURRENT knob Adjusts the output current.

7 – OUT ON button Output function

: Press OUT ON to turn the output on or off. Press OUT ON to reset

and turn the output on after an OVP or OCP event has occurred.

Start-up function

: Selects between Safe-Start and Auto-Restart modes. Press and hold the OUT ON button to toggle between Safe-Start and Auto-Restart. The display cycles between SAF and AU7. Releasing the OUT ON button while one of the modes is displayed selects that mode.

8 – OUT ON indicator When lit, indicates that the output is enabled or on.

10 Series N5700 User’s Guide

Quick Reference 1

9 – LAN button View address

: Press LAN to view the IP and Ethernet address. The display first scrolls through the four segments of the IP address, followed by the six segments of the Ethernet (EA) address. Press any key to turn the address display off.

Reset address: Press and hold the LAN button for three seconds. Pressing the LAN button again while the message “LAn rES” is displayed resets the LAN configuration to the factory-shipped settings (see chapter 4 for settings). If the key is not pressed again, the display returns to normal and the configuration is not changed.

10 – LAN indicator When lit, indicates that the LAN has been configured and is operating normally.

When blinking, identifies the unit for which the indicator has been set to blink by the unit’s Web home page.

11 – OCP/488 button Enable OCP

: Press OCP/488 to turn over-current protection on. Press OCP/488 again

to turn over-current protection off.

Reset OCP

: When an over-current protection event occurs, press the OUT ON button

to enable the output and re-arm over-current protection.

GPIB address

: Press and hold the OCP/488 button for three seconds. This lets you set the GPIB address with the Voltage knob.

12 – OCP indicator When lit, indicates that over-current protection is enabled or on.

13 – OVP/UVL button OVP function

: Press OVP/UVL once to set the over-voltage protection level with the Voltage knob (the display shows OUP). You cannot set the over-voltage protection lower than about 5% above the present output voltage setting.

UVL function the Voltage knob (the display shows UUL).

: Press OVP/UVL twice to set the under-voltage programming limit with

You cannot set the under-voltage

protection higher than about 5% below the present output voltage setting.

14 – LIMIT button Limit function

: Press LIMIT to display the output voltage and current limit. For five seconds the display shows the settings and then it returns to show the actual output voltage and current.

Lock function

: Press and hold the LIMIT button to toggle between Locked front panel and Unlocked front panel. The display will cycle between LFP and UFP. Releasing the LIMIT button while one of the modes is displayed selects that mode.

If the display

indicates rLFP, the front panel has been locked by a remote programming command.

15 – LIMIT indicator When lit, indicates that the LIMIT button is pressed.

16 – FINE button Selects Fine or Coarse adjustment control. In Fine mode, the Voltage and Current

knobs operate with high resolution; in Coarse mode, with lower resolution (approximately six turns).

17 – FINE indicator When lit, indicates that the unit is in Fine adjustment mode.

18 – PROT indicator When blinking, indicates that a fault has occurred.

OVP, OCP, OTP, Enable fail, and AC fail detection will cause the PROT indicator to blink.

The PROT indicator may blink and the display indicate AC for a few seconds after

the unit is turned off because of residual

energy inside the unit.

19 – POWER switch Turns the power supply on or off.

Series N5700 User’s Guide 11

1 Quick Reference

The Rear Panel – At a Glance

+S+LS NC -LC-S

SW1

1 2 3 4 5 6 7 8 9

OFF

GPIB

ANALOG PROGRAMMING

10/100 Ethernet

LINK TX

NOT ACTIVE

! !

+V -V

80V - 600V

7 3

1 – AC input connector Wire clamp connector for 1500W output models.

IEC connector for 750W output models.

2 – DC output connector Wire clamp connector for 80V to 600V models.

Bus bars for 6V to 60V models.

3 – USB connector Connector for connecting to a USB interface. See chapter 4 for setup.

AC INPUT

750W

1500W6V - 60V

4 – LAN connector Connector for connecting to a LAN interface. LINK LED indicates link integrity.

TX LED indicates LAN activity. See chapter 4 for LAN setup.

5 – Analog Programming connector

Connector for the analog interface. Includes output voltage and current limit programming and monitoring signals, Shut-Off control (electrical signal), Enable/Disable control (dry-contact), power supply ok (Power Supply OK) signal and operation mode (CV/CC) signal. (See next page for details)

6 – SW1 setup switch Nine-position switch for selecting remote programming and monitoring modes

for Output Voltage, Current Limit and other control functions. (See next page for details)

7 – Remote Sense connector Connector for making remote sensing connections for regulating the load

voltage and compensating for wiring voltage drop. (See next page for details)

8 – GPIB connector Connector for connecting to a GPIB interface. See chapter 4 for setup.

9 – Ground screw M4x8 screws for making chassis ground connections

WARNING

SHOCK HAZARD The power cord provides a chassis ground through a third conductor. Be certain that your power outlet is of the three-conductor type with the correct pin connected to earth ground

12 Series N5700 User’s Guide

J2 Sense Connector

1 – Remote sense (+) 2 – Local sense (+) 3 – Not used 4 – Local sense (–) 5 – Remote sense (–)

The factory-shipped configuration is shown in the figure.

SW1 Setup Switch

Quick Reference 1

The factory-shipped setting is Down for all switches.

1 – Output voltage, voltage programming

2 – Output current, voltage programming

3 – Programming range (voltage/resistance)

4 – Voltage and Current monitoring range

Down

: The output voltage is programmed by the external voltage signal.

Down Up

: The output current is programmed by the external voltage signal.

Down

: The remote programming range is: 0 – 10V / 0 – 10KΩ.

Down

: The remote monitoring range is: 0 – 10V.

5 – Shut-Off Logic Select Down

: OUT OFF = High (2V – 15V) or open; OUT ON = Low (0 – 0.6V) or short.

6 – Not Used

7 – Output voltage, resistive programming

8 – Output current, resistive programming

Down

: The output voltage is programmed by the external resistor.

Down

: The output current is programmed by the external resistor.

9 – Enable/Disable control Down

: The J1 Enable+/Enable– pins are active.

: The output voltage is programmed by the front panel.

: The output current is programmed by the front panel.

: The remote programming range is: 0 – 5V / 0 – 5KΩ.

: The remote monitoring range is: 0 – 5V.

: OUT OFF = Low (0 – 0.6V) or short; OUT ON = High (2V – 15V) or open.

: The output voltage is programmed by the front panel.

: The output current is programmed by the front panel.

: The J1 Enable+/Enable– pins are not active.

Series N5700 User’s Guide 13

1 Quick Reference

J1 Analog Programming Connector

Current Program Voltage Program Local / Analog

Chassis Common Chassis Common Enable +

14151617

Shut Off Power Suppl y OK

Voltage Monitor

Common (-S)

CV / CC

Parallel Enable --

Current Monitor Current Prog. Return Voltage Pro g. Return

Local / Analog State

232425

The factory-shipped default configuration is Local operation, which does not require connection to J1.

Pin 1: Enable + Connect Pin 1 to Pin 14 to enable the output. Disconnect to disable the output.

Pin 2, 3: Chassis Common Signal return for Pin 15 and Pin 16. Connected to chassis.

Pin 4–7: Not Used No connection

Pin 8: Local/Analog Input for selecting between front panel or analog programming of the output.

Pin 9: Voltage Program Input for voltage or resistance programming of the output voltage.

Pin 10: Current Program Input for voltage or resistance programming of the output current.

Pin 11: Voltage Monitor Output for monitoring the output voltage.

Pin 12: Common Signal return for Pin 8, Pin11, Pin 13, and Pin 24. Connected internally to –S.

Pin 13: CV/CC Output for constant voltage/constant current mode indication.

Pin 14: Enable – Connect Pin 14 to Pin 1 to enable the output. Disconnect to disable the output.

Pin 15: Shut Off Input for Shut-Off control of the output. Referenced to Chassis Common.

Pin 16: Power Supply OK Output to indicate the power supply status. Referenced to Chassis Common.

Pin 17–20: Not Used No connection

Pin 21: Local/Analog State Output for indication of local or analog programming mode.

Pin 22: Voltage Prog. Return Signal return for Pin 9. Connected internally to –S.

Pin 23: Current Prog. Return Signal return for Pin 10. Connected internally to –S.

Pin 24: Current Monitor Output for monitoring the output current.

Pin 25: Parallel Output for current balancing in parallel operation.

14 Series N5700 User’s Guide

2 Installation

General Information.......................................................................................... 16

Inspecting the Unit ...........................................................................................17

Installing the Unit..............................................................................................17

Connecting the Line Cord ................................................................................19

Connecting the Load.........................................................................................21

Output Voltage Sensing................................................................................... 24

Load Considerations......................................................................................... 26

Parallel Connections.........................................................................................28

Series Connections........................................................................................... 30

J1 Connector Connections .............................................................................. 32

This chapter describes how to install your power supply. It discusses installation, rack mounting, and line cord connections.

This chapter also discusses how to connect your load to the output terminals. It discusses what you need to know about wire sizes and how to compensate for voltage drops in the load leads. It also discusses various loads configurations and how to connect units in series and parallel.

Before getting started, check the list under “Items Supplied” and verify that you have received these items with your instrument. If anything is missing, please contact your nearest Agilent Sales and Service Office.

Series N5700 User’s Guide 15

2 Installation

General Information

Models

Items Supplied

750 W Models 1500 W Models

N5741A – N5749A N5761A – N5769A

N5750A – N5752A N5770A – N5772A

Item Description

Power Cord A power cord appropriate for your location

750W units are supplied with terminated power cords 1500W units are supplied with unterminated power cords

Strain relief assembly A strain relief assembly for unterminated power cords

(only used for 1500W units)

AC input cover A cover for the AC input on which the strain relief assembly

is mounted (only used for 1500W units)

Analog connector A DB25 subminiature connector plug for analog control

connections

Shield assembly A safety shield for the output terminal connections

Hardware Nuts, washers, and bolts for connecting load leads to output

bus bars (only used for 6V to 60V units)

Documentation Set Contains User’s Guide with Product Reference CD-ROM

Certificate of Calibration A certificate of calibration referenced to the serial number

Automation-Ready CD-ROM

E2094N - contains Agilent IO Libraries Suite

Accessories

Item Description

N5740A Rack-mount slide kit for installing in system II cabinets

16 Series N5700 User’s Guide

Inspecting the Unit

Installing the Unit

Safety Considerations

Installation 2

When you receive your power supply, inspect it for any obvious damage that may have occurred during shipment. If there is damage, notify the shipping carrier and nearest Agilent Sales and Service Office immediately. Refer to Appendix C for more information.

Until you have checked out the power supply, save the shipping carton and packing materials in case the unit has to be returned.

This power supply is a Safety Class 1 instrument, which means it has a protective earth terminal. That terminal must be connected to earth ground through power source equipped with a ground receptacle. Refer to the Safety Summary page at the beginning of this guide for general safety information. Before installation or operation, check the power supply and review this guide for safety warnings and instructions. Safety warnings for specific procedures are located at appropriate places throughout this Guide.

Environment

WARNING

NOTE

Airflow

Do not operate the instrument in the presence of flammable gasses or fumes

The environmental conditions, dimensions of the instrument, as well as an outline diagram are given in Appendix A. Basically, the instrument should only be operated indoors in a controlled environment. Do not operate the power supply in an area where the ambient temperature exceeds 40° C.

Agilent N5700 power supplies generate magnetic fields, which may affect the operation of other instruments. If your equipment is susceptible to magnetic fields, do not position it adjacent to the power supply.

Fans cool the power supply by drawing air through the front and exhausting it out the back. The instrument must be installed in a location that allows sufficient space of at least 10 cm (4 in) at the front and back of the unit for adequate air circulation.

Series N5700 User’s Guide 17

2 Installation

Rack Installation

CAUTION

Ensure that the screws used to attach the rack slide kit do not penetrate more than 6 mm into the sides of the unit.

Do not block the air intake at the front, or the exhaust at the rear of the unit.

The Agilent N5700 power supplies can be mounted in a standard 19inch rack panel or cabinet. They are designed to fit in one rack unit (1U) of space. To install the power supply in a rack:

1. Use the front panel rack-mount brackets to install the power supply in the rack.

2. Use a support bracket to provide adequate support for the rear of the power supply.

3. If using rack mount slides, use Agilent N5740A Rack-mount Slide Kit to install the unit in a standard 19-inch equipment rack. Refer to the following figure for assembly instructions. Use two #10-32 x 3/8 in (max.) screws at each side. To prevent internal damage, use the specified screw length only.

Cleaning

WARNING

18 Series N5700 User’s Guide

SHOCK HAZARD To prevent electric shock, unplug the unit before cleaning.

Use a dry cloth or one slightly dampened with water to clean the external case parts. Do not attempt to clean internally.

Connecting the Line Cord

Installation 2

WARNING

NOTE

SHOCK HAZARD The power cord provides a chassis ground through a third conductor. Be certain that your power outlet is of the three-conductor type with the correct pin connected to earth ground.

FIRE HAZARD Use only the power cord that was supplied with your instrument. Using other types of power cords may cause overheating of the power cord, resulting in fire.

The detachable power cord may be used as an emergency disconnecting device. Removing the power cord will disconnect ac input power to the unit.

The AC input on the back of your unit is a universal AC input. It accepts line voltages in the range of 85 VAC to 265 VAC. The frequency range is 47 Hz to 63 Hz.

The input current requirement of 750W units is 10.5A @ 100 VAC nominal and 5A @ 200 VAC nominal. The current requirement of 1500W units is 21A @ 100 VAC nominal and 11A @ 200 VAC nominal.

Input Connections for 750W units

Connect the power cord to the IEC 320 connector on the rear of the unit. The IEC connector provides the safety ground connection when the AC cord is plugged into a grounded AC receptacle.

If the wrong power cord was shipped with your unit, contact your nearest Agilent Sales and Service Office.

Input Connections for 1500W units

CAUTION

Connection of this power supply to an AC power source should be made by a qualified electrician or other qualified personnel.

The AC input connector is a 3-terminal wire clamp located on the rear panel. Use suitable wires and tightening torque as follows:

• Wire diameter: 12 AWG or 10 AWG

• Tightening torque: 6.5 - 7.0 in-lb

Connect the cable to the AC input connector as follows:

• Strip the outside insulation of the AC cable approximately 10 cm (4 in). Trim the wires so that the ground wire is 10 mm (0.4 in) longer than the other wires. Strip 14 mm (0.55 in) at the end of each of the wires.

Series N5700 User’s Guide 19

2 Installation

• Unscrew the base of the strain relief from the wire compression nut. Place the locknut inside the AC input cover with the flat side of the nut against the cover. Insert the base through the outside opening of the AC input cover. Screw the base securely onto the locknut from the outside (17 ft-lbs).

• Slide the wire compression nut over the AC cable. Insert the stripped wires through the strain relief base until the outer cable jacket is flush with the inside edge of the base. Place a wrench on the base to keep it from turning. Now tighten the compression nut to the base (14-16.2 ft-lbs) while holding the cable in place. Now the cable is securely fastened inside the strain relief. Refer to the following figure.

• Route the AC wires to the input connector terminals as required. To connect the wires, loosen the terminal screw, insert the stripped wire into the terminal, and tighten the screw securely to between 4.4–5.3 in-lbs.

• Route the wires inside the cover to prevent pinching. Fasten the cover to the unit using the M3 x 8mm pan head screws provided (4.8 in-lbs). Refer to the following figure for details.

M3 x 8mm

Pan Head Screws

(2 places)

Cover

Assembled

Strain Relief

20 Series N5700 User’s Guide

Connecting the Load

Installation 2

WARNING

Wire Size

WARNING

SHOCK HAZARD Turn off AC power before making rear panel connections. All wires and straps must be properly connected with screws securely tightened.

As further explained in this section, the following factors should be considered when selecting wiring to connect the load to the power supply:

• Current carrying capacity of the wire

• Insulation rating of the wire should be at least equivalent to

the maximum output voltage of the power supply

• Maximum wire length and voltage drop

• Noise and impedance effects of the load wiring

FIRE HAZARD To satisfy safety requirements, select a wire size heavy enough not to overheat while carrying the power supply load current at the rated load, or the current that would flow in the event the load wires were shorted, whichever is greater.

Along with conductor temperature, you must also consider voltage drop when selecting wire sizes. The following chart lists the resistance for various wire sizes and also the maximum lengths to limit the voltage drop to 1.0 volt for various currents.

Although the power supply will compensate for up to 5V in each load wire, it is recommended to minimize the voltage drop to less than 1V to prevent excessive output power consumption from the power supply and poor dynamic response to load changes.

Wire size AWG

14 2.526 80 40 20 8 2 12 1.589 120 60 30 12 3.4 10 0.9994 200 100 50 20 6 8 0.6285 320 160 80 32 10 6 0.3953 500 250 125 50 16 4 0.2486 800 400 200 80 26 2 0.1564 1200 600 300 125 40 0 0.0983 2000 1000 500 200 68

Resistance ΩΩΩΩ/1000 foot

Maximum length in feet to limit voltage to 1 V for 5 A for 10 A for 20A for 50A for 150A

Series N5700 User’s Guide 21

2 Installation

Cross section (mm

2.5 8.21 24.0 12.0 6.0 2.4 0.8 4 5.09 39.2 18.6 9.8 4.0 1.4 6 3.39 59.0 29.4 14.8 5.8 2.0 10 1.95 102 51.2 25.6 10.2 3.4 16 1.24 160 80.0 40.0 16.0 5.4 25 0.795 250 125 62.0 25.2 8.4 35 0.565 354 177 88.0 35.4 11.8

)

Resistance ΩΩΩΩ/kilometer

Maximum length in meters to limit voltage to 1 V for 5 A for 10 A for 20A for 50A for 150A

Load Connections for 6V to 60V Models

WARNING

CAUTION

SHOCK HAZARD Hazardous voltages may exist at the outputs and the load connections when using a power supply with a rated output greater than 40V. To protect personnel against accidental contact with hazardous voltages, ensure that the load and its connections have no accessible live parts. Ensure that the load wiring insulation rating is greater than or equal to the maximum output voltage of the power supply.

Ensure that the load wiring mounting hardware does not short the output terminals. Heavy connecting cables must have some form of strain relief to prevent loosening the connections or bending the bus-bars.

All load wires should be properly terminated with wire terminals securely attached. Do not use unterminated wires for load connections at the power supply. The following figures illustrate how to connect the load wires to the power supply bus-bars as well as how to mount the bus-bar shield to the chassis.

Wire terminal lug (2 places)

M8x15 screw (2 places)

Flat washer (2 places)

Spring washer (2 places)

Hex Nut (2 places)

Screws tightening torque: 104-118 in-lb.

22 Series N5700 User’s Guide

Install the shield after you have finished connecting the load wires.

Load Connections for 80V to 600V Models

Installation 2

Shield

WARNING

The 80V to 600V models have a four-terminal wire clamp output connector. The two left terminals are the positive outputs and the two right terminals are the negative outputs. The connector specifications are as follows:

Wire Size:

Stripping Length:

Torque:

AWG 18 to AWG 10

10 mm (0.39 in.)

6.5 - 7 in-lb.

The following instructions describe how to connect the load wires to the power supply:

• Strip wires back approximately 10 mm (0.39 in).

• Loosen the connector terminal screws and insert the stripped

wires into the terminal. Tighten the terminal screw securely.

-V

Positive Output (+)

Negative (-)

Output/Retur

Load wires

Series N5700 User’s Guide 23

2 Installation

• Loosen the two chassis screws marked A halfway.

• Assemble the protective shield to the chassis and tighten the

two screws to fix the shield to the chassis. Screw tightening torque: 4.8-5.3 in-lb

• Tighten the wires to one of the shield sides using tie-wrap or equivalent. Refer to the following figure.

Output Voltage Sensing

WARNING

Load wire

• Ensure that the wire length inside the shield is long enough to provide proper strain relief.

SHOCK HAZARD There is a potential shock hazard at the sense connector when using a power supply with a rated output greater than 40V. Ensure that the local sense and remote sense wiring insulation rating is greater than or equal to the maximum output voltage of the power supply. Ensure that the connections at the load end are shielded to prevent accidental contact with hazardous voltages.

Local and remote sense connections are made at the J2 connector. The connector has a removable plug that makes it easy for you to make your wire connections. Refer to the following figure for the terminal assignments.

1 Remote sense (+) 2 Local sense (+) 3 Not connected 4 Local sense (-) 5 Remote sense (-)

24 Series N5700 User’s Guide

The J2 connector plug specifications are as follows:

Installation 2

Local Sensing

Plug Type:

Wire Size:

Stripping Length:

Torque:

MC 1.5/5-ST-3.81, Phoenix

AWG 28 to AWG 16

7 mm (0.28 in.)

0.22 – 0.25 Nm (1.95 – 2.21 in-lb.)

The power supply is shipped with the rear panel J2 sense connector wired for local sensing of the output voltage. With local sensing, the output voltage regulation is made at the output terminals. This method does not compensate for voltage drop on the load wires, therefore it is recommended only for low load current applications or where the load regulation is less critical. The following figure illustrates the internal connections of the J2 connector.

Power Supply

Error Amp.

Rem.sense

Local sense

Rem.sense

-V

Load lines, twisted pair, shortest length possible.

Load

NOTE

Remote Sensing

If the power supply is operated without the local sense jumpers or without the remote sense lines connected, it will continue to work, but the output voltage regulation will be degraded. Also, the OVP circuit may activate and shut down the power supply. Note that the internal wiring between +V and + local sense and between –V and – local sense will fail if load current flows through it.

Use remote sensing in applications where load regulation at the load is critical. Remote sensing allows the power supply to automatically compensate for the voltage drop in the load leads. Refer to Appendix A for the maximum allowable voltage drop on the load wires.

Remote sensing is especially useful in constant voltage mode with load impedances that vary or have significant lead resistance. It has no effect in constant current mode. Because sensing is independent of other power supply functions it can be used regardless of how the power supply is programmed. With remote sensing, voltage readback monitors the load voltage at the remote sense points.

Use twisted or shielded wires to minimize noise pick-up. If shielded wires are used, the shield should be connected to the ground at one point, either at the power supply chassis or the load ground. The optimal point for the shield ground should be determined by experimentation.

Series N5700 User’s Guide 25

2 Installation

To configure the power supply for remote sensing:

• Turn off the power supply.

• Remove the local sense jumpers from the J2 connector.

• Connect the negative sense lead to terminal 5 (-S) and the

positive sense lead to terminal 1 (+S). Make sure that the connector plug is securely inserted into the connector body.

• Turn on the power supply.

Load lines. Twisted pair

shortest length possible.

NOTE

Load Considerations

Multiple Loads

Power Supply

Rem.sense

Local sense

ocal sense

Rem.sense

-V

Sense lines. Twisted pair or

shielded wires.

Load

If the power supply is operated with remote sensing and either the positive or negative load wire is not connected, an internal protection circuit will activate and shut down the power supply. To resume operation, turn the power supply off, connect the open load wire, and turn on the power supply.

The following figure shows multiple loads connected to one power supply. Each load should be connected to the power supply’s output terminals using separate pairs of wires. It is recommended that each pair of wires will be as short as possible and twisted or shielded to minimize noise pick-up and radiation. The sense wires should be connected to the power supply output terminals or to the load with the most critical load regulation requirement.

Load lines, twisted pair, shortest length possible.

Power Supply

Rem.sense

Local sense

ocal sense

Rem.sense

-V

Load#1

Load#2

Load#3

26 Series N5700 User’s Guide

Installation 2

If remotely located distribution terminals are used, as shown in the following figure, the power supply output terminals should be connected to the remote distribution terminals by a pair of twisted and/or shielded wires. Connect each load to the distribution terminals separately. Remote voltage sensing is recommended under these circumstances. Sense either at the remote distribution terminals or, if one load is more sensitive than the others, directly at the critical load.

Power Supply

Rem.sense

Local sense

+L +

-V

ocal sense

Rem.sense

Output Noise and Impedance Effects

To minimize the noise pickup or radiation, the load wires and remote sense wires should be twisted-pairs to the shortest possible length. Shielding of sense leads may be necessary in high noise environments. Where shielding is used, connect the shield to the chassis via a rear panel ground screw. Even if noise is not a concern, the load and remote sense wires should be twisted-pairs to reduce coupling, which might impact the stability of power supply. The sense leads should be separated from the power leads.

Twisting the load wires reduces the parasitic inductance of the cable, which could produce high frequency voltage spikes at the load and the output because of current variation in the load itself.

Distribution terminal

-V

Load#1

Load#2

Load#3

The impedance introduced between the power supply output and the load could make the ripple and noise at the load worse than the noise at the power supply rear panel output. Additional filtering with bypass capacitors at the load terminals may be required to bypass the high frequency load current.

Inductive Loads

Inductive loads can produce voltage spikes that may be harmful to the power supply. A diode should be connected across the output. The diode voltage and current rating should be greater than the power supply maximum output voltage and current rating. Connect the cathode to the positive output and the anode to the negative output of the power supply.

Where positive load transients such as back EMF from a motor may occur, connect a surge suppressor across the output to protect the power supply. The breakdown voltage rating of the suppressor must be approximately 10% higher than the maximum output voltage of the power supply.

Series N5700 User’s Guide 27

2 Installation

Grounding the Output

The output of the power supply is isolated from earth ground. Either positive or negative voltages can be obtained from the output by grounding (or "commoning") one of the output terminals. However, if the positive terminal is grounded, the negative terminal cannot exceed 400 VDC relative to that ground. Always use two wires to connect the load to the output regardless of where or how the system is grounded.

To avoid noise problems caused by common-mode current flowing from the load to ground, it is recommended to ground the output terminal as close as possible to the power supply chassis ground

WARNING

Parallel Connections

CAUTION

SHOCK HAZARD For models up to 60VDC rated output, no point shall be more than +/-60VDC above/below chassis ground. For models > 60VDC rated output, no point shall be more than +/-600VDC above/below chassis ground.

The maximum rating of the Negative output terminal is 400 VDC.

Only power supplies that have identical voltage and current ratings can be connected in parallel.

Up to four units of the same voltage and current rating can be connected in parallel to provide up to four times the output current capability. Refer to the following figures for typical connections of parallel power supplies using either local or remote sensing. The figures show two units, however, the same connection method applies for up to four units.

MASTER POWER SUPPLY

J1-25

Parallel

J1-12

J1-8

SLAVE POWER SUPPLY

Current Program

J1-10

+S+LS-S -LS

As short as possible

-V

Twisted pair

LOAD

Local Sensing

28 Series N5700 User’s Guide

Installation 2

-S

Twisted pair

As short as possible

Twisted pair

-S

LOAD

-S

MASTER

POWER SUPPLY

J1-25

Parallel

J1-12

J1-8

SLAVE POWER SUPPLY

Current Program

J1-10

+S-S

-V

+S-S

Remote Sensing

One of the units operates as a master and the remaining units are slaves. The slave units operate as controlled current sources following the master output current. In remote operation, only the master unit can be programmed by the computer while the slave units may be connected to the computer for voltage, current and status readback only.

It is recommended that each unit supplies only up to 95% of its current rating because of the imbalance that may be caused by cabling and connections voltage drops.

Setting up the Master Unit

Connect the sensing circuit for either local or remote sensing as shown in the previous figures. Set the master unit output voltage to the desired voltage. Program the current limit to the desired load current limit divided by the number of parallel units. During operation, the master unit operates in constant voltage mode, regulating the load voltage at the programmed output voltage.

Setting up the Slave Units

Set the rear panel setup switch SW1 position 2 to it’s up position. Connect J1 pin 10 (Current Program) of the slave unit to J1 pin 25 (Parallel) of the master unit. Also connect a short between J1 pin 8 and J1 pin 12. The output voltage of the slave units should be programmed higher than the output voltage of the master unit to prevent interference with the master unit’s control. The current limit of each unit should be programmed to the desired load current limit divided by the number of parallel units.

Series N5700 User’s Guide 29

2 Installation

Setting the Over-Voltage Protection

Setting the Over-Current Protection

Series Connections

The master unit OVP should be programmed to the desired OVP level. The OVP of the slave units should be programmed to a higher value than the master. When the master unit shuts down, it programs the slave unit to zero output voltage. If a slave unit shuts down when its OVP is set lower than the master output voltage, only that unit shuts down and the remaining slave units will supply all the load current.

Over-current protection, if desired, may only be used with the master unit. When the master unit shuts down, it programs the slave units to zero output voltage.

WARNING

CAUTION

There is also a potential shock hazard at the IEEE/LAN/USB ports when using power supplies with rated or combined voltages > 400VDC with the positive output of the power supplies grounded. Do not connect the positive output to ground when using the IEEE/LAN/USB under the above conditions.

Only power supplies that have identical voltage and current ratings can be connected in series.

Two units of the same voltage and current rating can be connected in series to provide up to two times the output voltage capability. Because the current is the same through each element in a series circuit, outputs connected in series must have equivalent current ratings. Otherwise, the higher rated output could potentially damage the lower rated output by forcing excessive current through it under certain load conditions. Refer to the following figures for typical series connections using either local or remote sensing.

It is recommended that diodes be connected in parallel with each output to prevent reverse voltage during start up sequence or in case one unit shuts down. Each diode should be rated to at least the rated output voltage and output current of the power supply.

30 Series N5700 User’s Guide

+LS

POWER SUPPLY

+LS

POWER SUPPLY

-LS

-S

Installation 2

+LS

-LS

+LS

-LS

-S

(*)

LOAD

(*)

POWER SUPPLY

LOAD

(*)

(*) Diodes are user supplied.

POWER SUPPLY

Local Sensing

CAUTION

Remote Sensing

Refer to the following figure for typical connections of series power supplies configured as a positive and a negative output.

+LS

-S

(*)

-S-LS

(*)

(*) Diodes are user supplied.

POWER SUPPLY

-LS

This caution applies when using analog voltage programming with seriesconnected power supplies. The analog programming circuits of these power supplies are referenced to the negative sense (-S) potential. Therefore, the analog voltage circuits used to control each series-connected unit must be separated and floated from each other.

Series N5700 User’s Guide 31

2 Installation

J1 Connector Connections

WARNING

Voltage Monitor

Common (-S)

CV / CC

Parallel Enable --

Current Monitor Current Prog. Return Voltage Pro g. Return

Local / Analog State

SHOCK HAZARD There is a potential shock hazard at the J1 connector when using a power supply with a rated output greater than 40V. Ensure that the load wiring insulation rating is greater than or equal to the maximum output voltage of the power supply.

External programming and monitoring signal are located on the J1 connector. The power supply is shipped with a mating plug that makes it easy for you to make your wire connections. It is essential to use this plastic-body plug to conform to safety agency requirements. If a shield is required for the J1 wires, connect the shield to the ground screw located on the power supply chassis.

Refer to the following figure for the pin assignments. A description of the pins is given in chapter 1.

232425

Pins on this side are referenced to the negative sense (-S) terminal.

Current Program Voltage Program Local / Analog

14151617

Pins on this side are isolated from output terminals and are referenced to chassis ground.

Chassis Common Chassis Common Enable +

Shut Off Power Supply OK

The mating plug specifications for the J1 connector are as follows:

Mating Plug:

Wire Size:

Extraction tool:

AMP part number 745211-2

AWG 26 to AWG 22

AMP part number 91232-1 or equivalent

Manual pistol grip tool: Handle: AMP p/n 58074-1

Head: AMP p/n 58063-1

CAUTION

Pins 12, 22 and 23 of J1 are connected internally to the negative sense (-S) potential of the power supply. Do not attempt to bias any of these pins relative to the negative output terminal. Use an isolated, ungrounded, programming source to prevent ground loops and to maintain the isolation of the power supply when programming from J1.

Chapter 3 describes how to configure the J1 connector when using it to program the output voltage and current.

32 Series N5700 User’s Guide

3 Operating the Power Supply Locally

Turn-On Check-Out........................................................................................... 34

Normal Operation.............................................................................................. 36

Protection Functions ........................................................................................ 37

Output On/Off Controls....................................................................................40

Analog Programming of Output Voltage and Current................................. 42

This chapter contains examples on how to operate your power supply from the front panel. A check-out procedure is included to let you verify that the power supply is operating properly. Additionally, information about programming the power supply using the J1 analog programming connector is also provided.

The simple examples discussed in this chapter show you how to program:

 output voltage and current functions

 protection functions

 output on/off functions

 safe-start and auto-restart

 analog programming of voltage and current

 front panel locking

Refer to chapters 4 and 5 for information on programming your power supply using SCPI commands.

Series N5700 User’s Guide 33

3 Operating the Power Supply Locally

Turn-On Check-Out

Before Check-Out

Ensure that the power supply is configured as follows:

• The unit is connected to an appropriate AC source as described in chapter 2.

• The POWER switch is in the off position.

• Sense connector pins 1 and 2 are jumpered; sense connector

pins 4 and 5 are jumpered.

• All switches on Connector J2 are in the down position.

WARNING

SHOCK HAZARD Be aware that hazardous voltages can be present on the output terminals. Do not set the output voltage above 40 VDC during the turnon check-out procedure.

Constant Voltage Check

• Turn the POWER switch on.

• Turn the output on by pressing the OUT ON button. The

green OUT ON indicator should be illuminated.

• The green CV indicator should also be illuminated. If the CC indicator is illuminated, rotate the current knob until the CV indicator becomes illuminated.

• Rotate the voltage knob while observing the DC VOLTS display. The output voltage should vary while the knob is turned. The voltage range is from zero to the maximum rated output for the power supply model.

OVP Check

• Rotate the voltage knob and set the output voltage of the unit to 50% of its full-scale rating or 30 volts, whichever is lower.

• Press the OVP/UVL button once so that the DC AMPS display indicates OUP. The DC VOLTS display shows the OVP level.

• Use the voltage knob and set the OVP level of the unit to 75% of its full-scale voltage rating or 40 volts, whichever is lower.

• Wait a few seconds until the DC VOLTS display returns to show the output voltage.

• Use the voltage knob and raise the output voltage of the unit until it approaches the OVP setting. Check to make sure that the output voltage cannot be set higher than the OVP setting.

• Press the OVP/UVL button again. Rotate the voltage knob and reset the OVP level of the unit to its maximum setting.

34 Series N5700 User’s Guide

UVL Check

• Press the OVP/UVL button twice so that the DC AMPS display indicates UUL. The DC VOLTS display shows the UVL level.

• Use the voltage knob and set the UVL level of the unit to 50% of its full-scale voltage rating or 30 volts, whichever is lower.

• Wait a few seconds until the DC VOLTS display returns to show the output voltage.

• Use the voltage knob and lower the output voltage of the unit until it approaches the UVL setting. Check to make sure that the output voltage cannot be set lower than the UVL setting.

• Press the OVP/UVL button twice. Rotate the voltage knob and reset the UVL level of the unit to its minimum setting.

Constant Current Check

• Turn the POWER switch off. Wait a few seconds until the AC indicator on the front panel goes out.

• Use a heavy wire and short the +V and –V output terminals together.

Operating the Power Supply Locally 3

OCP Check

• Turn the POWER switch on.

• Turn the output on by pressing the OUT ON button. The

green OUT ON indicator should be illuminated. The green CC indicator should be also illuminated.

• Rotate the current knob while observing the DC AMPS display. The output current should vary while the knob is turned. The current range is from zero to the maximum rated output for the power supply model.

• Rotate the current knob and set the current limit of the unit to about 10% of its full-scale current rating.

• Press the OCP/488 button. This should trip the OCP protection. The OCP indicator should be illuminated, the DC VOLTS display should indicate OCP, and the Alarm indicator should be blinking.

• Press the OCP/488 button again to cancel OCP protection. The DC VOLTS display should indicate OFF because the OCP protection is latched.

• Press the OUT ON button to reset the OCP protection. The output should return to its previous setting.

• Turn the POWER switch off.

• Remove the short from the +V and –V output terminals.

Series N5700 User’s Guide 35

3 Operating the Power Supply Locally

Normal Operation

Constant Voltage Mode

The power supply has two basic operating modes: constant voltage and constant current mode. In constant voltage mode, the power supply regulates the output voltage at the selected value, while the load current varies as required by the load. In constant current mode, the power supply regulates the output current at the selected value, while the voltage varies as required by the load. The mode in which the power supply operates at any given time depends on the voltage setting, current limit setting, and the load resistance.

When the power supply is operating in constant voltage mode, the CV indicator on the front panel illuminates.

Adjustment of the output voltage can be made when the output is enabled (On) or disabled (Off). When the output is enabled, simply rotate the voltage knob to program the output voltage.

When the output is disabled, press the LIMIT button and then rotate the voltage knob. The DC VOLTS display will show the programmed voltage for 5 seconds after the adjustment has been completed and then indicate OFF.

The voltage knob can be set to coarse or fine resolution. Press the FINE button to select finer resolution. The FINE indicator turns on.

NOTE

If you cannot adjust the voltage to the value that you desire, the power supply may be operating at its current limit. Check the load condition and the current limit setting. Also, the voltage cannot be programmed lower than about 5% above the UVL setting, or higher than about 5% below the OVP setting.

Constant Current Mode

When the power supply is operating in constant current mode, the CC indicator on the front panel illuminates.

Adjustment of the output current limit can be made when the output is enabled (On) or disabled (Off). When the output is enabled and in constant current mode, simply rotate the current knob to program the current limit. If the output is in constant voltage mode, press the LIMIT button and then rotate the current knob. The DC AMPS display will show the programmed current for 5 seconds after the adjustment has been completed and then indicate the actual output current.

When the output is disabled, press the LIMIT button and then rotate the current knob. The DC AMPS display will show the programmed current for 5 seconds after the adjustment has been completed and then go blank because the output is off.

The current knob can be set to coarse or fine resolution. Press the FINE button to select finer resolution. The FINE indicator turns on.

36 Series N5700 User’s Guide

CV/CC Mode Crossover

If the power supply is in constant voltage mode and the load current increases above the current limit setting, the power supply switches to constant current mode. If the load decreases below the current limit setting, the power supply switches to constant voltage mode.

CV/CC Signal

Operating the Power Supply Locally 3

CAUTION

Protection Functions

Over-Voltage Protection

Do not connect the CV/CC signal to a voltage source higher than 30VDC. Always connect the CV/CC signal to the voltage source with a series resistor to limit the sink current to less than 10mA.

The CV/CC signal available on the J1 connector indicates the operating mode of the power supply. The CV/CC signal is an open collector output with a 30V parallel zener at J1 pin 13, referenced to common at J1 pin 12. J1 pin 12 is connected internally to the –S terminal. When the power supply operates in constant voltage mode, CV/CC output is open. When the power supply operates in constant current mode, CV/CC signal output is low (0 - 0.6V), with maximum 10mA sink current.

The over-voltage protection protects against over-voltage conditions on the output. If the output voltage attempts to exceed the programmed limit in response to an analog programming signal or in the event of a power supply failure, the over-voltage protection circuit will protect the load by disabling the output. The voltage is monitored at the sense terminals, thus providing the protection level directly at the load. Upon detection of an over-voltage condition, the output is disabled, the display shows OVP, the PROT indicator blinks, and OV is set in the Questionable Condition status register.

Adjustment of the over-voltage setting can be made when the output is enabled (On) or disabled (Off). To set the OVP level, press the OVP/UVL button so that the display indicates OUP. The display will show the OVP setting. Rotate the voltage knob to adjust the OVP level. The display will show OVP and the setting value for another five seconds and then return to its previous state.

The OVP settings are limited at the minimum level to approximately 5% above the output voltage setting. Attempting to adjust the OVP below this limit will result in no response to the adjustment attempt. Refer to Appendix A for the maximum OVP settings.

Use one of the following methods to reset the OVP circuit after it activates. If the condition that caused the over-voltage shutdown is still present, the OVP circuit will turn the output off again.

Series N5700 User’s Guide 37

3 Operating the Power Supply Locally

Under-Voltage Limit

• Press the OUT ON button to turn the output on.

• Turn the AC power off, wait a few seconds, and turn it on.

• Turn the output off, then on again using the Shut Off pin on

the J1 connector. This only applies in Auto-Restart mode.

• If the OVP continues to trip, try lowering the output voltage below the OVP setting, or raising the OVP setting.

The under-voltage limit prevents adjustment of the output voltage below a certain limit. The combination of UVL and OVP functions let you create a protection window for sensitive load circuitry.

Setting the UVL can be made when the output is enabled (On) or disabled (Off). To set the UVL level, press the OVP/UVL button twice, so that the display shows UUL. The display will show the UVL setting. Rotate the voltage knob to adjust the UVL level. The display will show UUL and the setting value for another five seconds and then return to its previous state.

The UVL settings are limited at the maximum level to approximately 5% below the output voltage setting. Attempting to adjust the UVL above this limit will result in no response to the adjustment attempt. The minimum UVL setting is zero.

Over-Current Protection

Over-current protection will shut down the power supply output if the load current exceeds the current limit setting. This protection is useful when the load is sensitive to an over-current condition.

To arm the over-current protection, press the OCP/488 button so that the OCP indicator illuminates. When armed, a transition from constant voltage to constant current mode will activate the overcurrent protection. When an over-current protection event occurs, the output is disabled, the display shows OCP, the PROT indicator blinks, and OC is set in the Questionable Condition status register.

Use one of the following methods to reset over-current protection after it activates. If the load current is still higher than the current limit setting, the over-current protection will be activated again.

• Press the OUT ON button to turn the output on.

• Turn the AC power off, wait a few seconds, and turn it on.

• Turn the output off, then on again using the Shut Off pin on

the J1 connector. This only applies in Auto-Restart mode.

• Press the OCP/488 button to cancel over-current protection. The display will show OFF because OCP protection is latched. Press the OUT ON button to reset OCP. With this method, the over-current protection is disabled. If the load current is still higher than the current limit setting, the power supply will only attempt to limit the current at the current limit setting.

38 Series N5700 User’s Guide

Over-Temperature Protection

The over-temperature protection circuit shuts down the power supply before the internal components can exceed their safe internal operating temperature. This can occur if there is a cooling fan failure. When an OTP condition occurs, the output is disabled, the display shows O7P, the PROT indicator blinks, and the OT status bit is set in the Questionable Condition status register. Resetting the OTP circuit can be automatic (non-latched) or manual (latched) depending on the Safe-Start or Auto-Restart mode.

In Safe-Start mode, the OTP circuit is latched. The display continues to show O7P and the PROT indicator continues to blink. To reset the OTP circuit, press the OUT ON button.

In Auto-Restart mode, the OTP circuit is non-latched. The power supply returns to its last setting automatically when the overtemperature condition is removed.

Power-Fail Protection

If the AC power stops briefly, but returns before the power supply has reset, the power-fail protection circuit trips and the PF status bit is set in the Questionable Condition status register. Resetting the power-fail protection can be automatic (non-latched) or manual (latched), depending on the Safe-Start or Auto-Restart mode.

Operating the Power Supply Locally 3

In Safe-Start mode, the output of the power supply is Off, as specified by the reset state when AC power returns. In Auto-Restart mode, the power supply recovers its last settings when AC power returns.

Front Panel Lock-Out

The front panel controls can be locked to protect from accidental power supply parameter change. Press and hold the LIMIT button to toggle between Locked front panel and Unlocked front panel. The display will cycle between LFP and UFP. Releasing the LIMIT button while one of the modes is displayed, selects that mode.

In Unlocked front panel mode, the front panel controls are enabled to program and monitor the power supply parameters.

In Locked front panel mode, the VOLTAGE and CURRENT knobs, the OCP/488 button, and the OUT ON button are disabled

The power supply will not respond to attempts to use these controls. The display will show LFP to indicate that the front panel is locked. The OVP/UVL button remains active to preview the OVP and UVL setting. The LIMIT button also remains active to preview the output voltage and current setting or to unlock the front panel.

NOTE

This function operates independently of the SCPI SYST:COMM:RLST command. If the front panel has been locked from the front panel, it cannot be unlocked by SYST:COMM:RLST. Conversely, if the front panel has been locked by SYST:COMM:RLST, it cannot be unlocked from the front panel.

Series N5700 User’s Guide 39

3 Operating the Power Supply Locally

Output On/Off Controls

OUT ON button

Safe-Start and Auto-Restart

The Output On/Off controls turn the power supply output on or off. This can be done with the front panel OUT ON button or from the rear panel J1 connector. With the output off, adjustments can be made to the power supply or the load without shutting off AC power.

The OUT ON button can be pressed at any time to enable or disable the power supply output. When the output is disabled, the output voltage and current go to zero and the display shows OFF.

The power supply can be programmed to have either the last operating settings (Auto-Restart) or the reset settings (Safe-Start) apply at turn-on. Press and hold the OUT ON button to select between Safe-Start and Auto-Restart modes. The display continuously cycles between SAF and AUT every three seconds. Releasing the OUT ON button while one of the modes is displayed, selects that mode.

In Safe-Start mode, the power supply turns on with the reset settings (see chapter 5 under “*RST”). The output is disabled and the output voltage and current are zero. This is the factory default.

In Auto-Restart mode, the power supply restores the operating settings that were saved when it was last turned off (see below). The output is either enabled or disabled according to its last setting.

Output On/Off state UVL level

Output voltage setting OCP setting

Output current setting Locked/Unlocked front panel

OVP level Start-up mode

Output Shut-Off Terminals

Output Shut-Off (SO) terminals are available on the J1 connector to enable or disable the power supply output. This function is edge- triggered. J1 pin 15 is the Shut-Off input, and pins 2 and 3, which are connected internally, are the signal common. All pins are optically isolated from the power supply output. The Shut-Off input accepts a 2.5V-to-15V signal or an open/short contact to enable or disable the output. The Shut-Off control logic is selected by SW1 setup switch 5.

When an on-to-off transition is detected at the Shut-Off input, the Shut-Off function enables or disables the output according to the signal level or the open/short applied to J1 pin 15. When the output has been disabled by the Shut-Off function, the display shows SO to indicate the output is disabled.

40 Series N5700 User’s Guide

Operating the Power Supply Locally 3

To re-enable the output after it has shut down, you must disable the Shut-Off signal. In Auto-Restart mode, operation resumes automatically. In Safe-Start mode the Shut-Off function is latched. You must also press the OUT ON button or send an OUTPut:PROTection:CLEar command to resume operation.

The Shut-Off function can be used to shut down multiple power supplies in a daisy-chain fashion as explained later in this chapter. It can also be used to reset the OVP and OCP as previously described.

SW1 switch 5 SO Signal Level Output Display

Down (default) 2 - 15 V or Open On Voltage/Current

0 – 0.4V or Short Off SO

Up 2 - 15 V or Open Off SO

0 – 0.4V or Short On Voltage/Current

NOTE

Because this function is edge-triggered, it may not be triggered by every state change. For example, after applying AC power, the output will not be disabled by the Shut Off function if the Shut-Off input is in the shut-off state. This is because the unit has not detected an on-to-off signal transition.

Enable/Disable Terminals

CAUTION

SW1 switch 9 ENA+/ENA– pins Output Display Prot Indicator

Down (default) Not active On Voltage/Current Off

Up Opened Off ENA Blinking

Shorted On Voltage/Current Off

To prevent possible damage to the unit, do not connect the Enable + or Enable – terminals to the positive or negative output terminals.

Enable/Disable terminals are available on the J1 connector to enable or disable the power supply output. This function is level-triggered. Simply connect a switch or relay between J1 pins 1 and 14. This function is activated by SW1 setup switch 9.

These pins disable the output when they are opened. When the output is disabled, the PROT indicator on the front panel will blink.

To re-enable the output after it has shut down, you must short the Enable + and Enable – terminals. In Auto-Restart mode, operation resumes automatically. In Safe-Start mode the Enable/Disable function is latched. You must also press the OUT ON button or send an OUTPut:PROTection:CLEar command to resume operation.

Series N5700 User’s Guide 41

3 Operating the Power Supply Locally

Power Supply OK Signal

Daisy-Chained Output Shut-down

The Power Supply OK signal on the J1 connector indicates a fault condition in the power supply. J1 pin 16 is a TTL output signal. Pins 2 and 3, which are connected internally, are the signal common. All pins are optically isolated from the power supply output. With no fault, Power Supply OK is high, with a maximum source current of 2mA. When a fault occurs, Power Supply OK is low, with a maximum sink current of 1mA. The following faults set this signal low:

Over-voltage protection Enable/Disable signal true

Over-current protection Shut Off signal true

Over-temperature protection Remote interface failure

AC line failure Output turned off

It is possible to configure a multiple power supply system to shut down all the units when a fault condition occurs in one of the units. SW1 setup switch 5 must be in the Down position to enable the daisychain operation. Other switches are unaffected by this setting.

If a fault occurs in one unit, its Power Supply OK signal is set low and its display will indicate the fault. The other units shut off with their displays indicating SO. When the fault condition is cleared, all units will recover according to their Safe-Start or Auto-Restart settings.

The following figure shows three units daisy-chained - the same connection method can be used with additional units. The Shut Off and Power Supply OK signals are referenced to Chassis Common (J1 pins 2 and 3).

POWER SUPPLY

J1-2,3 J1-16 J1-16J1-16J1-15

Supply OK

Shut OffCom Shut OffSupply OKCom Com Supply OK Shut Off

POWER SUPPLY

J1-2,3 J1-15

Analog Programming of Output Voltage and Current

CAUTION

J1 pin 12, pin 22, and pin 23 are internally connected to the negative sense terminal. Do not reference these pins to any terminal other than the negative sense terminal, as it may damage the unit.

POWER SUPPLY

J1-2,3 J1-15

In Local mode, the output voltage and current is programmed with the front panel VOLTAGE and CURRENT knobs or over the remote interface. In Analog mode, the output voltage and current can be programmed either by an analog voltage or by resistors connected to the rear panel J1 connector.

42 Series N5700 User’s Guide

Operating the Power Supply Locally 3

The J1 connector also provides monitoring signals for the output voltage and output current. The programming range and monitoring signal range can be selected using the SW1 setup switch.

NOTE

With analog programming enabled, you cannot program the output voltage or current using the front panel knobs or the remote interface. However, you can read back output voltage or current from the front panel or the remote interface.

Analog Programming Control Terminals

J1 connector pin 8 accepts a TTL signal or an open/short contact switch (referenced to pin 12) to select between Local or Analog programming of the output voltage and current. This function is enabled or disabled by SW1 setup switches 1 and 2.

J1 connector pin 21 is an open collector output that indicates if the power supply is in Local mode or in Analog mode. To use this output, connect a pull-up resistor to a voltage source of 30 VDC maximum. Choose the pull-up resistor so that the sink current will be less than 5mA when the output is in low state.

SW1 switch 1 and 2 J1 pin 8

function

Both Down (default) No effect Open Local

Either one, or both Up 0 or Short 0~0.6V Analog

1 or Open Open Local

J1 pin 21 signal

Output voltage/ current control

Voltage Programming of Output Voltage and Current

CAUTION

To maintain the isolation of the power supply and prevent ground loops, use an isolated programming source when operating the unit using analog programming.

Voltage programming sources of 0 - 5 V or 0 - 10 V can be used to program the output voltage and current limit from zero to full scale.

Set the power supply to analog voltage programming as follows:

• Make sure that the power supply is turned off.

• Set SW1 setup switch 1 (for voltage) and 2 (for current) to

the Up position.

• Set SW1 setup switch 3 to select programming voltage range according to the following table.

• Make sure that SW1 setup switches 7 and 8 are set Down.

• Connect a short between J1 pin 8 and J1 pin 12 (see figure).

• Connect the programming source to the mating plug of J1 as

shown in the following figure. Observe the correct polarity for the voltage source.

Series N5700 User’s Guide 43

3 Operating the Power Supply Locally

• Set the programming sources to the desired levels and turn the power supply on. Adjust the programming sources to change the power supply output.

The analog control circuits let you set the output voltage and current limit up to 5% over the model-rated maximum value. The power supply will operate within the extended range, however it is not recommended to operate the power supply over its voltage and current rating, and performance in this region is not guaranteed.

SW1 switch 3 Voltage Programming

(J1 pin 9)

Current Programming (J1 pin 10)

Down (default) 0 – 5 V 0 – 5 V

Up 0 – 10 V 0 – 10 V

CURRENT LIMIT PROGRAMMING

OUTPUT VOLTAGE

PROGRAMMING

Resistance Programming of Output Voltage and Current

Resistances of 0 - 5 kΩ or 0 - 10 kΩ can be selected to program the output voltage and current limit from zero to full scale. Internal current sources supply a 1mA current through the external resistors. The voltage drop across the resistors is used as the programming voltage for the power supply. To maintain the temperature stability specification of the power supply, only use resistors that are stable and low noise, with a temperature coefficient less than 50ppm.

Set the power supply to resistance programming as follows:

• Make sure that the power supply is turned off.

• Set SW1 setup switch 1 (for voltage) and 2 (for current) to

the UP position.

• Set SW1 setup switch 3 to select programming resistance range according to the following table.

• Set SW1 setup switch 7 (for voltage) and 8 (for current) to the Up position to enable resistance programming.

• Connect a short between J1 pin 8 and J1 pin 12 (see figure).

• Connect the programming resistors to the mating plug of J1

as shown in the following figure. A variable resistor can control the output over its entire range, or a combination of variable resistor and series/parallel resistors can control the output over a restricted portion of its range.

44 Series N5700 User’s Guide

PROGRAMMING

RESISTOR

OPTIONAL SETS

LOWER LIMIT

Operating the Power Supply Locally 3

• Set the programming resistors to the desired resistance and turn the power supply on. Adjust the resistors to change the power supply output.

SW1 switch 3 Voltage Programming

(J1 pin 9)

Current programming (J1 pin 10)

Down (default) 0 – 5 kΩ 0 – 5 kΩ

Up 0 – 10 kΩ 0 – 10 kΩ

CURRENT LIMIT PROGRAMMING

12 8

10 9

OUTPUT VOLTAGE

PROGRAMMING

RESISTOR

OPTIONAL SETS

LOWER LIMIT

OPTIONAL SETS

UPPER LIMIT

External Monitoring of Output Voltage and Current

The J1 connector also provides analog signals for monitoring the output voltage and current. Selection of the voltage range between 0 – 5 V or 0 – 10 V is made by SW1 setup switch 4. The monitoring signals represent 0 to 100% of the power supply output voltage and current rating. The monitor outputs have a 500 Ω series output resistance. Make sure that the sensing circuit has an input resistance greater than 500 kΩ or the accuracy will be reduced.

SW1 switch 4 Voltage

range

Down (default) 0 – 5 V J1 pin 11 Voltage Monitor

J1 pin 24 Current Monitor

Up 0 – 10 V J1 pin 11 Voltage Monitor

J1 pin 24 Current Monitor

J1 pin 12 is the signal common for J1 pins 11 and 24.

J1 signal connection

OPTIONAL SETS

UPPER LIMIT

Signal function

Series N5700 User’s Guide 45

4 Operating the Power Supply Remotely

Connecting to the Interfaces ..........................................................................48

SCPI Commands – an Introduction................................................................ 58

This chapter contains information on how to configure the three remote interfaces that are provided on the back of the instrument. In most cases you can connect your power supply to any one of these interfaces and be up and running with a minimum amount of configuration.

NOTE

Detailed information on configuring the remote interfaces is included in the USB/LAN/GPIB Interfaces Connectivity Guide document located on the Automation-Ready CD-ROM included with this product.

This chapter also contains a brief introduction to the SCPI Programming language. SCPI (Standard Commands for Programmable Instruments) is a programming language for controlling instrument functions over the GPIB. SCPI is layered on top of the hardware-portion of IEEE 488.2. The same SCPI commands and parameters control the same functions in different classes of instruments.

Series N5700 User’s Guide 47

4 Operating the Power Supply Remotely

Connecting to the Interfaces

The Agilent N5700 power supplies support remote interface communication using a choice of three interfaces: GPIB, USB, and LAN. All three interfaces are live at power-on.

GPIB Interface

NOTE

For detailed information about GPIB interface connections, refer to the Agilent Technologies USB/LAN/GPIB Interfaces Connectivity Guide, located on the Automation-Ready CD-ROM that is shipped with your product.

The following steps will help you quickly get started connecting your instrument to the General Purpose Interface Bus (GPIB). The following figure illustrates a typical GPIB interface system.

GPIB Cable

Connect to GPIB Interface Card installed in PC.

Connect to GPIB port on instrument.

Instrument

1 If you have not already done so, install the Agilent IO Libraries

Suite from the Automation-Ready CD-ROM that is shipped with your product.

2 If you do not have a GPIB interface card installed on your

computer, turn off your computer and install the GPIB card.

3 Connect your instrument to the GPIB interface card using a GPIB

interface cable.

Instrument

4 Use the Connection Expert utility of the Agilent IO Libraries

Suite to configure the installed GPIB interface card’s parameters.

5 The power supply is shipped with its GPIB address set to 5. Use

the front panel menu if you need to change the GPIB address.

a Press and hold the OCP/488 button for about three seconds.

The DC VOLTS display will show the present GPIB address.

b To change the GPIB address, turn the voltage knob until the

desired GPIB address appears in the display. Valid GPIB addresses are in the range of 0 to 30.

6 You can now use Interactive IO within the Connection Expert to

communicate with your instrument, or you can program your instrument using the various programming environments.

48 Series N5700 User’s Guide

USB Interface

Operating the Power Supply Remotely 4

NOTE

For detailed information about USB interface connections, refer to the Agilent Technologies USB/LAN/GPIB Interfaces Connectivity Guide, located on the Automation-Ready CD-ROM that is shipped with your product.

The following steps will help you quickly get started connecting your USB-enabled instrument to the Universal Serial Bus (USB). The following figure illustrates a typical USB interface system.

USB Cable

Connect to USB port on PC.

Connect to USB port on instrument.

Instrument

1 If you have not already done so, install the Agilent IO Libraries

Suite from the Automation-Ready CD-ROM that is shipped with your product.

2 Connect your instrument to the USB port on your computer.

3 With the Connection Expert utility of the Agilent IO Libraries

Suite running, the computer will automatically recognize the instrument. This may take several seconds. When the instrument is recognized, your computer will display the VISA alias, IDN string, and VISA address. This information is located in the USB folder.

NOTE

LAN Interface

NOTE

The VISA address is: USB0::2391::2055::serialnumber::0:INSTR where 2391 is the Agilent code, 2055 is the N5700 code, and serialnumber is the 10-character serial number located on the label on the side of the unit.

4 You can now use Interactive IO within the Connection Expert to

communicate with your instrument, or you can program your instrument using the various programming environments.

For detailed information about LAN interface connections, refer to the Agilent Technologies USB/LAN/GPIB Interfaces Connectivity Guide, located on the Automation-Ready CD-ROM that is shipped with your product.

The following steps will help you quickly get started connecting and configuring your instrument on a local area network (LAN). The two types of local area networks connections that are discussed in this section are site networks and private networks.

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4 Operating the Power Supply Remotely

Connecting to a Site LAN

A site LAN is a local area network in which LAN-enabled instruments and computers are connected to the network through routers, hubs, and/or switches. They are typically large, centrally-managed networks with services such as DHCP and DNS servers.

To Network Interface Card (NIC)

To LAN Port

To Site LAN

NOTE

Instrument

1 If you have not already done so, install the Agilent IO Libraries

Suite from the Automation-Ready CD-ROM that is shipped with your product.

2 Connect the instrument to the site LAN. Provided that your

network has a DHCP server and uses Dynamic DNS naming service, the instrument will automatically obtain an IP address from the network. This may take up to one minute. It will also register its hostname with the dynamic DNS server. The default hostname can then be used to communicate with the instrument.

The front panel LAN indicator will come on when the LAN port has been configured. If you are unable to communicate with the instrument, check that a valid IP address has been assigned. Press the front panel LAN button to view the IP address.

Each Agilent N5700 power supply is shipped with a default hostname with the format: A-modelnumber-serialnumber where modelnumber is the instrument’s 6-character model number (e.g. N5741A), and serialnumber is 5th through the 9th character of the 10-character serial number located on the label on the side of the unit (e.g. H1234 if the serial number is US24H12345). A-N5741A-H1234 is an example of a hostname.

3 Use the Connection Expert utility of the Agilent IO Libraries

Suite to add the N5700 power supply and verify a connection. To add the instrument, you can request the Connection Expert to discover the instrument. If the instrument cannot be found, you can add the instrument using the instrument’s hostname.

NOTE

If this does not work, refer to the chapter on “Troubleshooting Guidelines” in the Agilent Technologies USB/LAN/GPIB Interfaces Connectivity Guide.

4 You can now use Interactive IO within the Connection Expert to

communicate with your instrument, or you can program your instrument using the various programming environments. You can also use the Web browser on your computer to communicate with the instrument as described under “Using the Web Server” later in this chapter.

50 Series N5700 User’s Guide

Operating the Power Supply Remotely 4

Connecting to a Private LAN:

A private LAN is a network in which LAN-enabled instruments and computers are directly connected, and not connected to a site LAN. They are typically small, with no centrally-managed resources.

NOTE

To Network Interface Card (NIC)

CAT5 Crossover Cable

To LAN Port

Instrument

1 If you have not already done so, install the Agilent IO Libraries

Suite from the Automation-Ready CD-ROM that is shipped with your product.

2 Connect the instrument to the computer using a LAN crossover

cable. Alternatively, connect the computer and the instrument to a standalone hub or switch using regular LAN cables.

Make sure your computer is configured to obtain its address from DHCP and that NetBIOS over TCP/IP is enabled. If the computer had been connected to a site LAN, it may still retain previous network settings from the site LAN. Wait one minute after disconnecting it from the site LAN before connecting it to the private LAN. This allows Windows to sense that it is on a different network and restart the network configuration. If you are running Windows 98, you may need to manually release the previous settings.

3 The factory-shipped instrument LAN settings are configured to

automatically obtain an IP address from the network using a DHCP server, or using AutoIP if a DHCP server is not present. You can leave these settings as they are. Most Agilent products and most computers will automatically choose an IP address using auto-IP if a DHCP server is not present. Each assigns itself an IP address from the block 169.254.nnn. Note that this may take up to one minute.

4 Use the Connection Expert utility of the Agilent IO Libraries

NOTE

If this does not work, refer to the chapter on “Troubleshooting Guidelines” in the Agilent Technologies USB/LAN/GPIB Interfaces Connectivity Guide.

Series N5700 User’s Guide 51

4 Operating the Power Supply Remotely

5 You can now use Interactive IO within the Connection Expert to

LAN Communication

The Agilent IO Libraries Suite along with instrument drivers for specific programming environments can be used to communicate with your power supply. Your can also communicate with your power supply using its built-in Web server, the Telnet utility, or sockets. These latter methods are a convenient way to communicate with the power supply without using I/O libraries or drivers.

Ethernet Connection Monitoring

Agilent N5700 power supplies that have the LXI label on the front panel provide Ethernet connection monitoring. With Ethernet connection monitoring, the instrument’s LAN port is continually monitored, and automatically reconfigured when the instrument is unplugged for a minimum of 20 seconds and then reconnected to a network. The front panel LAN indicator will come on when the LAN port is connected and configured.

NOTE

Using the Web Server

Your power supply has a built-in Web server that lets you control it directly from an internet browser on your computer. With the Web server, you can control and configure all of the front panel functions as well as additional functions such as triggering and the LAN parameters, which are not available from the front panel.

The built-in Web server only operates over the LAN interface. It requires Internet Explorer 5+ or Netscape 6.2+. You also need the Java (Sun) plug-in. This is included in the Java Runtime Environment. Refer to Sun Microsystem’s website.

The Web server is enabled when shipped. To launch the Web server:

1 Open the internet browser on your computer.

2 In the Tools menu, under Internet Options, select Connections,

then LAN Settings, and make sure that the Bypass proxy server for local addresses box is checked.

3 Enter the instrument’s hostname into the browser’s Address field

to launch the Web server. The following home page will appear.

4 Click on the Browser Web Control button in the navigation bar

on the left to begin controlling your instrument.

5 For additional help about any of the pages, click on the Help with

this Page button.

If desired, you can control access to the Web server using password protection. As shipped from the factory, no password is set. To set a password, refer to the section “Configuring the LAN Parameters”.

52 Series N5700 User’s Guide

Using Telnet

Operating the Power Supply Remotely 4

In an MS-DOS Command Prompt box type: telnet hostname 5024 where hostname is the N5700 hostname or IP address, and 5024 is the instrument’s telnet port.

You should get a Telnet session box with a title indicating that you are connected to the power supply. Type the SCPI commands at the prompt.

Using Sockets

Agilent instruments have standardized on using port 5025 for SCPI socket services. A data socket on this port can be used to send and receive ASCII/SCPI commands, queries, and query responses. All commands must be terminated with a newline for the message to be parsed. All query responses will also be terminated with a newline. The power supply allows any combination of up to three simultaneous data socket and telnet connections to be made.

The socket programming interface also allows a control socket connection. The control socket can be used by a client to send device clear and to receive service requests. Unlike the data socket, which uses a fixed port number, the port number for a control socket varies and must be obtained by sending the following SCPI query to the data socket: SYSTem:COMMunicate:TCPip:CONTrol?

After the control port number is obtained, a control socket connection can be opened. As with the data socket, all commands to the control socket must be terminated with a newline. All query responses will also be terminated with a newline.

To send a device clear, send the string “DCL” to the control socket. When the power supply has finished performing the device clear it echoes the string “DCL” back to the control socket.

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4 Operating the Power Supply Remotely

Service requests are enabled for control sockets using the Service Request Enable register. Once service requests have been enabled, the client program listens on the control connection. When SRQ goes true the instrument will send the string “SRQ +nn” to the client. The “nn” is the status byte value, which the client can use to determine the source of the service request.

Configuring the LAN Parameters

To configure the LAN parameters from the instrument’s Web server, launch the Web server as previously described, and click on the View & Modify Configuration tab on the left side of the page. Then click on the Modify Configuration button on the top of the page. The following screen lets you modify the LAN parameters:

The configurable LAN parameters are described as follows:

Obtain IP

Address

IP Address This value is the Internet Protocol (IP) address of the instrument. An IP

54 Series N5700 User’s Guide

This parameter configures the addressing of the instrument. Auto automatically configures the addressing. When selected, the instrument first tries to obtain an IP address from a DHCP server. If a DHCP server is found, the DHCP server assigns an IP address, Subnet Mask, and Default Gateway to the instrument. If a DHCP server is unavailable, the instrument tries to obtain an IP address using AutoIP. AutoIP automatically assigns an IP address, Subnet Mask, and Default Gateway addresses on networks that do not have a DHCP server. Manual allows you to manually configure the addressing of the instrument by entering values in the following three fields.

address is required for all IP and TCP/IP communications with the instrument. An IP Address consists of 4 decimal numbers separated by periods. Each decimal number ranges from 0 through 255.

Operating the Power Supply Remotely 4

Subnet Mask This value is used to enable the instrument to determine if a client IP address

is on the same local subnet. When a client IP address is on a different subnet, all packets must be sent to the Default Gateway.

Default

Gateway

DNS DNS is an internet service that translates domain names into IP addresses.

DNS Server This value is the address of the Domain Name System (DNS) server. If DHCP

Naming

Service

Host Name This field registers the supplied name with the selected naming service. If the

Domain This field registers the Internet domain for the instrument. The Domain must

This value is the IP Address of the default gateway that allows the instrument to communicate with systems that are not on the local subnet, as determined by the subnet mask setting.

This parameter indicates whether the IP address of the Domain Name System (DNS) server is obtained automatically or manually. Auto obtains the DNS server address from DHCP. Manual uses the DNS server in the following field.

is disabled, the DNS server parameter is needed for the instrument to be able to find and display its hostname.

This parameter specifies the Naming service, if any, to be used to register the instrument. NetBIOS indicates the instrument will be registered using the RFC NetBIOS naming protocol. Dynamic DNS indicates the instrument will be registered using the Dynamic DNS naming system.

field is blank, no name is registered. A hostname may contain upper and lower case letters, numbers and dashes(-). The maximum length is 15 characters. The format is A-modelnumber-serialnumber. Modelnumber is the instrument’s 6-character model number, and serialnumber is 5th through the 9th character of the 10-character serial number located on the label on the side of the unit.

start with a letter and may contain upper and lower case letters, numbers, dashes(-) and dots(.).

Description This field lets you assign a user-friendly name to the instrument. This name is

used as the title of the instrument’s Web home page.

LAN

Keepalive

Timeout

GPIB Address This field shows the instrument's GPIB bus address. The GPIB address can be

Change

Password

This value sets the LAN keepalive in seconds. The instrument uses the LAN keepalive timer to determine if a client is still reachable. If there has been no activity on the connection after the specified time, the instrument will send keepalive probes to the client to determine if it is still alive. If not, the connection will be marked as down or "dropped." The instrument will release any resources that were allocated to that client. When setting this parameter, it is recommended that the largest value be used that still meets the application's need for unreachable client detection. Smaller keepalive timeout values will generate more keepalive probes (network traffic), using more of the available network bandwidth. Check the Enable box to enable the LAN Keepalive function. Allowed values: 720-99999 seconds.

configured using the instrument's front panel.

This field lets you change the Web password. Enter the old password to confirm access. Enter the new password in the Enter New field and in the Confirm New field. The password can be up to 12 alpha-numeric characters (letters, numbers, underscore); case insensitive. The first character must be a letter. If the fields are blank, password checking is disabled.

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4 Operating the Power Supply Remotely

Factory-shipped LAN Settings

The factory-shipped LAN settings documented in the following table are optimized for connecting your power supply to a site network. They should also work well for other network configurations.

The factory-shipped settings can be restored by pressing and holding the front panel LAN button for three seconds. Pressing the LAN button again while the message “LAn rES” is displayed resets the LAN settings.

Factory-shipped non-volatile LAN settings

Get IP Address Automatic Dynamic DNS naming service Enabled

IP Address 169.254.57.0 NetBIOS naming service Enabled

Subnet Mask 255.255.0.0 Domain name Blank

Default Gateway 0.0.0.0 TCP keepalive Enabled

Obtain DNS server from DHCP Enabled TCP keepalive seconds 1800

DNS server Blank Ethernet Auto-negotiation Enabled

Host name A-N57xxA-xxxxx Ping server Enabled

Web password Blank

Using the Setup Utility

A Setup utility that lets you configure the LAN settings of your instrument is provided on the Product Reference CD-ROM included with this manual. Install and run this Setup utility if you cannot configure the LAN interface as previously described in this section.

1 Connect your power supply to your computer using either the

USB interface or the GPIB interface as previously described.

2 Install the Setup utility on your computer. Run the Setup utility

by clicking Start|Programs|Agilent|N5700 Setup Utility.

3 Configure the following LAN address parameters. These are

located under the Settings tab. For a description of these parameters, refer to the previous section.

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Operating the Power Supply Remotely 4

4 Enable the LAN and, optionally, the built-in Web server using the

applicable check boxes.

5 Click the Set button to save all the settings information.

6 Connect the LAN cable to your instrument and computer. Reboot

the instrument. Wait for the instrument to configure the new LAN settings.

7 View the LAN settings by clicking the LAN Status tab. Click the

Refresh button to update the display with the assigned IP Address and Subnet Mask.

8 You can view information about the GPIB or USB interface by

clicking the Connections tab.

You can also use the Setup utility to view model-specific information about your power supply. Click the Model About tab to view the model number, serial number, active firmware version, backup firmware version, and output ratings.

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4 Operating the Power Supply Remotely

SCPI Commands – an Introduction

SCPI (Standard Commands for Programmable Instruments) is an ASCII-based instrument command language designed for test and measurement instruments. 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. Subsystem commands perform specific power supply functions. A portion of the SOURce subsystem is shown below to illustrate the tree system.

[SOURce:] CURRent [:LEVel] [:IMMediate] <NRf+> :TRIGgered <NRf+> :PROTection :STATe <Bool>

SOURce is the root keyword of the command, CURRent is a secondlevel keyword, LEVel and PROTection are third-level keywords, and IMMediate, TRIGgered and STATe are fourth-level keywords. Colons (:) separate higher-level from lower-level keywords.

Syntax

The following command syntax is used in this manual:

Square Brackets [ ] Items within square brackets are optional. The representation [SOURce:]VOLTage

means that SOURce: may be omitted.

Angle brackets < > Items within angle brackets are parameter descriptions. For example, <NR1>

indicates a specific form of numerical data.

Vertical bar | Vertical bars separate alternative parameters. For example, VOLT | CURR indicates

that either "VOLT" or "CURR" can be used as a parameter.

The syntax characters cannot be included in the command string.

Multiple Commands in a Message

Multiple SCPI commands can be combined and sent as a single message with one message terminator. There are two important considerations when sending several commands within a single message:

 Use a semicolon (;) to separate commands within a message.

 There is an implied path that affects how commands are

interpreted by the power supply.

The command path can be thought of as a string that gets inserted before each keyword within a message. For the first command in a message, the path is a null string. For each subsequent command the path is defined as the characters that make up the keywords of the

58 Series N5700 User’s Guide

previous command in the message up to and including the last colon separator. An example of a message with two commands is:

OUTPut:STATe ON;PROTection:CLEar

which shows the use of the semicolon separating the two commands, and also illustrates the command path concept. Note that with the second command, the leading keyword OUTPut was omitted because after the OUTPut:STATe ON command, the path became defined as OUTPut, and thus the second command was interpreted as:

OUTPut:PROTection:CLEar

In fact, it would have been incorrect to include the OUTPut keyword in the second command, because the result after combining it with the command path would be:

OUTPut:OUTPut:PROTection:CLEar

which would result in a syntax error.

Commands from Different Subsystems

In order to combine commands from different subsystems, you need to be able to reset the command path to a null string within a message. Beginning the command with a colon (:), discards the previous path. For example, you could clear the output protection and check the status of the Operation Condition register in one message by using a root specifier as follows:

Operating the Power Supply Remotely 4

Message Unit

OUTPut:PROTection:CLEar;:STATus:OPERation:CONDition?

The following message shows how to combine commands from different subsystems as well as within the same subsystem.

VOLTage:LEVel 7.5;PROTection 10;:CURRent:LEVel 0.25

Note the use of the optional keyword LEVel to maintain the correct path within the subsystems, and the use of the root specifier (:) to move between subsystems.

The simplest SCPI command is a single message unit consisting of a keyword followed by a message terminator such as newline. The message unit may include a parameter after the keyword. The parameter can be numeric or a string.

ABORt<NL>

VOLTage 20<NL>

VOLTage:TRIGgered MINimum<NL>

Colons (:) separate higher-level keywords from lower-level keywords. Use a blank space to separate parameters from keywords. If a command requires more than one parameter, use commas to separate adjacent parameters.

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4 Operating the Power Supply Remotely

In the previous examples, the upper-case letters indicate the abbreviated spelling for the keyword. For shorter program lines, you can send the abbreviated form. For better program readability, you can send the long form. For example, VOLT and VOLTage are both acceptable forms. You can use upper- or lower-case letters. Therefore, VOLTAGE, Volt, and volt are all acceptable. Other forms, such as VOL and VOLTAG, generate an error.

Queries

You can query the current value of most commands by adding a question mark to the command (VOLTage?, VOLTage:TRIGgered?). If a query contains a parameter, place the query indicator at the end of the last keyword. Observe the following precautions with queries:

 Add a blank space between the query indicator (?) and any

 Set up the proper number of variables for the returned data.

 Read back all the results of a query before sending another

subsequent parameter. (VOLTage:TRIGgered? MAX)

command to the power supply. Otherwise a Query Interrupted error will occur and the unreturned data will be lost.

Common Commands

Common commands generally control overall power supply functions, such as reset, status, and synchronization. All common commands consist of a three-letter mnemonic preceded by an asterisk: *RST *IDN? *SRE 8

You can combine common commands with subsystem commands in the same message. Use semicolons to separate the common command from the subsystem commands. Common commands do not affect the command path; you may insert them anywhere in the message.

VOLTage:TRIGgered 10;:INITiate;*TRG

OUTPut OFF;*RCL 2;OUTPut ON

Command Terminators

A terminator informs SCPI that it has reached the end of a command. Three permitted command terminators are:

 newline (<NL>), which is ASCII decimal 10 or hex 0A.

 end or identify (<END>)

 both of the above (<NL><END>).

In the examples of this guide, the message terminator is assumed.

60 Series N5700 User’s Guide

Parameter Types

Data programmed or queried from the power supply is ASCII. The data may be numerical or character string.

Numeric Parameters

Operating the Power Supply Remotely 4

Symbol Response Formats

<NR1> Digits with an implied decimal point assumed at the right of the

least-significant digit. Examples: 273

<NR2> Digits with an explicit decimal point. Example: 27.3

<NR3> Digits with an explicit decimal point and an exponent. Example:

2.73E+02

Parameter Formats

<NRf> Extended format that includes <NR1>, <NR2> and <NR3>.

Examples: 273 27.3 2.73E+02

<NRf+> Expanded decimal format that includes <NRf> and MIN, MAX.

Examples: 273 27.3 2.73E+02 MAX.

MIN and MAX are the minimum and maximum limit values that are implicit in the range specification for the parameter.

<Bool> Boolean Data. Can be numeric (0, 1), or named (OFF, ON).

<SPD> String program data. String parameters enclosed in single or

double quotes.

Suffixes and Multipliers

Class Suffix Unit Unit with Multiplier

Current A ampere MA (milliampere)

Amplitude V volt MV (millivolt)

Time S second MS (millisecond)

Common Multipliers

1E3 K kilo

1E-3 M milli

1E-6 U micro

Response Data Types

Symbol Response Formats

<CRD> Character Response Data. Returns discrete parameters. Only

the short form of the parameter is returned.

<AARD> Arbitrary ASCII Response Data. Permits the return of

undelimited 7-bit ASCII. This data type has an implied message terminator.

<SRD> String Response Data. Returns string parameters enclosed in

double quotes.

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SCPI Command Completion

SCPI commands sent to the power supply are processed either sequentially or in parallel. Sequential commands finish execution before a subsequent command begins. Parallel commands allow other commands to begin executing while the parallel command is still executing.

The following is a list of parallel commands. You should use some form of command synchronization as discussed in this section before assuming that these commands have completed.

OUTPut:STATe INITiate VOLTage OUTPut:PROTection:CLEar CURRent

The *WAI, *OPC, and *OPC? common commands provide different ways of indicating when all transmitted commands, including any parallel ones, have completed their operations. Some practical considerations for using these commands are as follows:

*OPC?

NOTE

*WAI

*OPC

This command prevents the power supply from processing subsequent commands until all pending operations are completed. For example, the *WAI command can be used to make a voltage measurement after an output on command has completed:

OUTPut ON;*WAI;:MEASure:VOLTage?

This command places a 1 in the Output Queue when all pending operations have completed. Because it requires your program to read the returned value before executing the next program statement, *OPC? can be used to cause the controller to wait for commands to complete before proceeding with its program.

This command sets the OPC status bit when all pending operations have completed. Since your program can read this status bit on an interrupt basis, *OPC allows subsequent commands to be executed.

The trigger subsystem must be in the Idle state for the status OPC bit to be true. As far as triggers are concerned, OPC is false whenever the trigger subsystem is in the Initiated state.

Device Clear

You can send a Device Clear at any time to abort a SCPI command that may be hanging up the GPIB interface. Device Clear clears the input and output buffers of the power supply. The status registers, error queue, and all configuration states are left unchanged by Device Clear. Device Clear also prepares the power supply 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

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5 Language Reference

SCPI Command Summary................................................................................ 64

Calibration Commands .....................................................................................66

Measure Commands.........................................................................................67

Output Commands............................................................................................ 68

Source Commands............................................................................................ 69

Status Commands............................................................................................. 71

System Commands ........................................................................................... 77

Trigger Commands............................................................................................ 79

This section gives the syntax and parameters for all the IEEE 488.2 SCPI Subsystem commands and Common commands used by the power supply. It is assumed that you are familiar with the material in chapter 4, which explains the terms, symbols, and syntactical structures used here and gives an introduction to programming. You should also be familiar with chapter 3, in order to understand how the power supply functions.

Subsystem commands are specific to functions. They can be a single

command or a group of commands. The groups are comprised of commands that extend one or more levels below the root. The subsystem commands are arranged alphabetically according to the function they perform.

Common commands begin with an * and consist of three letters

(command) or three letters and a ? (query). They are defined by the IEEE 488.2 standard to perform common interface functions. Common commands are grouped along with the subsystem commands according to the function they perform.

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SCPI Command Summary

NOTE

Some [optional] commands have been included for clarity. All settings commands have a corresponding query.

Subsystem Commands

SCPI Command Description

ABORt Aborts the triggered action

CALibrate :CURRent[:LEVel] Calibrates the output current programming :DATA <NRf> Enters the calibration value :DATE <”SPD”> Sets the calibration date :LEVel P1 | P2 Advances to the next calibration step :PASSword <NRf> Sets the numeric calibration password :STATE <Bool> [,<NRf>] Enables/disables calibration mode :VOLTage[:LEVel] Calibrates the output voltage programming

INITiate [:IMMediate][:TRANsient] Initiates the trigger system :CONTinuous[:TRANsient] Enables/disables continuous triggers

MEASure [:SCALar] :CURRent[:DC]? Returns the measured output current :VOLTage[:DC]? Returns the measured output voltage

OUTPut [:STATe] <Bool> Enables/disables the specified output :PON :STATe RST | AUTO Programs the Power-On State :PROTection :CLEar Resets latched protection

[SOURce:] CURRent [:LEVel] [:IMMediate][:AMPLitude] <NRf+> Sets the output current :TRIGgered[:AMPLitude] <NRf+> Sets the triggered output current :PROTection :STATe <Bool> Enables/disables over-current protection VOLTage [:LEVel] [:IMMediate][:AMPLitude] <NRf+> Sets the output voltage :TRIGgered[:AMPLitude] <NRf+> Sets the triggered output voltage :LIMit :LOW <NRf+> Sets the low-voltage limit :PROTection [:LEVel] <NRf+> Sets the over-voltage protection level

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Language Reference 5

SCPI Command Description

STATus :OPERation [:EVENt]? Returns the value of the operation event register :CONDition? Returns the value of the operation condition register :ENABle <NRf> Enables specific bits in the Event register :NTRansition<NRf> Sets the Negative transition filter :PTRansition<NRf> Sets the Positive transition filter :PRESet Presets all enable and transition registers to power-on :QUEStionable [:EVENt]? Returns the value of the questionable event register :CONDition? Returns the value of the questionable condition register :ENABle <NRf> Enables specific bits in the Event register :NTRansition<NRf> Sets the Negative transition filter :PTRansition<NRf> Sets the Positive transition filter

SYSTem :COMMunicate :RLSTate LOCal | REMote | RWLock Specifies the Remote/Local state of the instrument :ERRor? Returns the error number and error string :VERSion? Returns the SCPI version number

TRIGger :SOURce BUS Sets the measurement trigger source [:TRANsient][:IMMediate] Generates a transient trigger

Common Commands

Command Description

*CLS Clear status *ESE <NRf> Standard event status enable *ESE? Return standard event status enable *ESR? Return event status register *IDN? Return instrument identification *OPC Enable "operation complete" bit in ESR *OPC? Return a "1" when operation complete *OPT? Return option number *RCL <NRf> Recalls a saved instrument state *RST Reset *SAV <NRf> Saves an instrument state *SRE <NRf> Set service request enable register *SRE? Return service request enable register *STB? Return status byte *TRG Trigger *TST Performs self-test, then returns result *WAI Holds off bus until all device commands done

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Calibration Commands

Calibration commands let you enable and disable the calibration mode, change the calibration password, calibrate current and voltage programming, and store new calibration constants in nonvolatile memory.

NOTE

If calibration mode has not been enabled with CALibrate:STATe, the calibration commands will generate an error.

CALibrate:CURRent[:LEVel]

This command initiates the calibration of the output current.

CALibrate:DATA <value>

This command enters a calibration value that you obtain by reading an external meter. You must first select a calibration level (with CALibrate:LEVel) for the value being entered. Data values are entered in either volts or amperes, depending on which function is being calibrated.

CALibrate:DATE <“date”> CALibrate:DATE?

This command stores the date the unit was last calibrated. The data must be of the numeric format “yyyy/mm/dd” where yyyy indicates the year, mm indicates the month, and dd indicates the day. The query returns the date.

CALibrate:LEVel P1|P2

This command selects the next point in the calibration sequence.

P1 is the first calibration point, P2 is the second calibration point.

CALibrate:PASSword <password>

This command lets you change the calibration password. A new password is automatically stored in nonvolatile memory. If the password is set to 0, password protection is removed and the ability to enter calibration mode is unrestricted. The default password is 0 (zero).

66 Series N5700 User’s Guide

CALibrate:STATe ON|OFF [,<password>] CALibrate:STATe?

This command enables/disables calibration mode. Calibration mode must be enabled for the power supply to accept any other calibration commands. The first parameter specifies the enabled or disabled state On (1) or Off (0). The second parameter is the password.

A password is required if calibration mode is being enabled and the existing password is not 0. If the password is not entered or is incorrect, an error is generated and the calibration mode remains disabled. The query returns only the state, not the password.

The *RST value = Off.

CALibrate:VOLTage[:LEVel]

This command initiates the calibration of the output voltage.

Language Reference 5

Measure Commands

MEASure[:SCALar]:CURRent[:DC]? MEASure[:SCALar]:VOLTage[:DC]?

Measure commands measure the output voltage or current. MEASure commands acquire new data before returning the reading. Measurement overflows return a reading of 9.91E+37.

These queries perform a measurement and return the DC output current in amperes or DC output voltage in volts.

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Output Commands

OUTPut[:STATe] ON|OFF OUTPut[:STATe]?

OUTPut:PON:STATe RST|AUTO OUTPut:PON:STATe?

Output commands enable the output, power-on, and protection functions.

This command enables or disables the specified output(s). The enabled state is On (1); the disabled state is Off (0). The state of a disabled output is a condition of zero output voltage and a zero source current (see *RST). The query returns 0 if the output is off, and 1 if the output is on. The *RST value = Off.

This command determines if the power-on state will be determined by the reset state, or the settings the unit had when it was turned off. RST programs the unit to the reset state; AUTO programs the unit to the settings it had when it was turned off. The power-on state information is saved on non-volatile memory.

Refer to *RST and *RCL under System Commands for details.

OUTPut:PROTection:CLEar

This command clears the latched signals that have disabled the output. The over-voltage and over-current conditions are always latching. The over-temperature condition, AC-fail condition, Enable pins, and SO pins are latching if OUTPut:PON:STATe is RST, and nonlatching if OUTPut:PON:STATe is AUTO.

All conditions that generate the fault must be removed before the latch can be cleared. The output is then restored to the state it was in before the fault condition occurred.

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Language Reference 5

Source Commands

Source commands program the voltage, current, triggered, and protection functions.

[SOURce:]CURRent[:LEVel][:IMMediate][:AMPLitude] <value>|MIN|MAX [SOURce:]CURRent[:LEVel][:IMMediate][:AMPLitude]? [MIN|MAX] [SOURce:]CURRent[:LEVel]:TRIGgered[:AMPLitude] <value>|MIN|MAX [SOURce:]CURRent[:LEVel]:TRIGgered[:AMPLitude]? [MIN|MAX]

These commands set the immediate and the triggered output current level. The values are programmed in amperes. The immediate level is the output current setting. The triggered level is a stored value that is transferred to the output when a trigger occurs. At *RST, the immediate and triggered current values = 0.

[SOURce:]CURRent:PROTection:STATe ON|OFF [SOURce:]CURRent:PROTection:STATe?

This command enables or disables the over-current protection (OCP) function. The enabled state is On (1); the disabled state is Off (0). If the over-current protection function is enabled and the output goes into constant current operation, the output is disabled and OC is set in the Questionable Condition status register. The *RST value = Off.

An over-current condition can be cleared with the Output Protection Clear command after the cause of the condition is removed.

[SOURce:]VOLTage[:LEVel][:IMMediate][:AMPLitude] <value>|MIN|MAX [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPLitude]? [MIN|MAX] [SOURce:]VOLTage[:LEVel]:TRIGgered[:AMPLitude] <value>|MIN|MAX [SOURce:]VOLTage[:LEVel]:TRIGgered[:AMPLitude]? [MIN|MAX]

These commands set the immediate and the triggered output voltage level. The values are programmed in volts. The immediate level is the output voltage setting. The triggered level is a stored value that is transferred to the output when a trigger occurs. At *RST, the immediate and triggered voltage values = 0.

The range of values that can be programmed for these commands is coupled with the voltage protection and the voltage limit low settings. The maximum value for the immediate and triggered voltage level is either the value in the following table, or the voltage protection setting divided by 1.05; whichever is lower. The minimum value is either the value in the table, or the low voltage setting divided by

0.95; whichever is higher.

Note that triggered values can be programmed outside these limits, but an error will be generated when the trigger occurs.

Model (V rating) 6V 8V 12.5V 20V 30V 40V 60V 80V 100V 150V 300V 600V

Min. voltage level 0 0 0 0 0 0 0 0 0 0 0 0

Max. voltage level 6.3 8.4 13.125 21 31.5 41.9 62.85 83.8 104.76 157.1 314.2 628.5

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[SOURce:]VOLTage:LIMit:LOW <value>|MIN|MAX [SOURce:]VOLTage:LIMit:LOW? [MIN|MAX]

This command sets the low voltage limit of the output. When a low voltage limit has been set, the instrument will ignore any programming commands that attempt to set the output voltage below the low voltage limit. The*RST value = Max.

The range of values that can be programmed for this command is coupled with the immediate voltage level setting. The maximum value for the low voltage limit is either the value in the following table, or the immediate voltage setting multiplied by 0.95; whichever is lower. The minimum setting is the value in the table.

Model (V rating) 6V 8V 12.5V 20V 30V 40V 60V 80V 100V 150V 300V 600V

Min. low limit 0 0 0 0 0 0 0 0 0 0 0 0

Max. low limit 5.7 7.6 11.9 19 28.5 38 57 76 95 142 285 570

[SOURce:]VOLTage:PROTection:LEVel <value>|MIN|MAX [SOURce:]VOLTage:PROTection:LEVel? [MIN|MAX]

This command sets the over-voltage protection (OVP) level of the output. The values are programmed in volts. If the output voltage exceeds the OVP level, the output is disabled and OV is set in the Questionable Condition status register. The*RST value = Max.

The range of values that can be programmed for this command is coupled with the immediate voltage level setting. The minimum value for the voltage protection level is either the value in the following table, or the immediate voltage setting multiplied by 1.05; whichever is higher. The maximum setting is the value in the table.

An over-voltage condition can be cleared with the Output Protection Clear command after the condition that caused the OVP trip is removed.

Model (V rating) 6V 8V 12.5V 20V 30V 40V 60V 80V 100V 150V 300V 600V

Min. protection limit 0.5 0.5 1.0 1.0 2.0 2.0 5.0 5.0 5.0 5.0 5.0 5.0

Max. protection limit 7.5 10 15 24 36 44 66 88 110 165 330 660

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Status Commands

QUESTIONABLE STATUS

CONDITION

INH9512

UNR

1024

PTR/NTR

512

1024

Language Reference 5

Status commands program the power supply’s status registers. As shown in the following figure, the power supply has three groups of status registers; Operation, Questionable, and Standard Event. The Operation and Questionable status groups each consist of the Condition, Enable, and Event registers and NTR and PTR filters.

EVENT ENABLE

512

1024

512

1024

LOGICAL

STAT:QUES:COND?

OPC

QYE

DDE

EXE

CME

PON

CONDITION

WTG

STAT:QUES:PTR |:NTR <n> STAT:QUES:PTR |:NTR ?

STANDARD EVENT

STATUS

EVENT ENABLE

128

*ESR?

256

*ESE<n> *ESE?

OPERATION STATUS

PTR/NTR EVENT

32 32

256

STAT:QUES:EVEN?

128

256

STAT:QUES:ENAB <n> STAT:QUES:ENAB

LOGICAL

ENABLE

256

OUTPUT BUFFER

Data

QUEUE

Data

LOGICAL

NOT

EMPTY

ERROR QUEUE

Err

STATUS BYTE

QUES

MAV

ESB

MSS

OPER

ERROR

QUEUE

NOT

EMPTY

128

*STB?

SERVICE

REQUEST

ENABLE

RQS

*SRE<n> *SRE?

SERVICE

REQUEST

GENERATION

128

LOGICAL

1024

STAT:OPER:COND?

STAT:OPER:PTR |:NTR <n> STAT:OPER:PTR |:NTR ?

1024

STAT:OPER:EVEN?

1024

STAT:OPER:ENAB <n> STAT:OPER:ENAB

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STATus:PRESet

STATus:OPERation[:EVENt]?

The Standard Event group is programmed with Common commands as described later in this section. Common commands also control additional status functions such as the Service Request Enable and the Status Byte registers.

This command sets all defined bits in the Operation and Questionable PTR registers. The command clears all defined bits in the Operation and Questionable NTR and Enable registers.

This query returns the value of the Operation Event register. The Event register is a read-only register, which stores (latches) all events that are passed by the Operation NTR and/or PTR filter. Reading the Operation Event register clears it. The bit configuration of the Operation status registers is as follows:

Bit Position 15-11 10 9 8 7-6 5 4-0

Bit Value

Bit Name

CC = The output is in constant current CV = The output is in constant voltage WTG = The unit is waiting for a transient trigger

−

1024

−

256

−

WTG

−

STATus:OPERation:CONDition?

This query returns the value of the Operation Condition register. That is a read-only register, which holds the live (unlatched) operational status of the power supply.

STATus:OPERation:ENABle <value> STATus:OPERation:ENABle?

This command and its query set and read the value of the Operational Enable register. This register is a mask for enabling specific bits from the Operation Event register to set the operation summary bit (OPER) of the Status Byte register. This bit (bit 7) is the logical OR of all the Operational Event register bits that are enabled by the Status Operation Enable register. The Preset value = 0.

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STATus:OPERation:NTR <value> STATus:OPERation:PTR <value> STATus:OPERation:NTR? STATus:OPERation:PTR?

These commands set or read the value of the Operation NTR (Negative-Transition) and PTR (Positive-Transition) registers. These registers serve as polarity filters between the Operation Condition and Operation Event registers to cause the following actions:

 When a bit in the Operation NTR register is set to 1, then a 1-to-0

transition of the corresponding bit in the Operation Condition register causes that bit in the Operation Event register to be set.

 When a bit of the Operation PTR register is set to 1, then a 0-to-1

transition of the corresponding bit in the Operation Condition register causes that bit in the Operation Event register to be set.

 If the same bits in both NTR and PTR registers are set to 1, then

any transition of that bit at the Operation Condition register sets the corresponding bit in the Operation Event register.

 If the same bits in both NTR and PTR registers are set to 0, then

no transition of that bit at the Operation Condition register can set the corresponding bit in the Operation Event register.

Language Reference 5

The Preset value are: NTR = 0; PTR = 32767

STATus:QUEStionable[:EVENt]?

This query returns the value of the Questionable Event register. The Event register is a read-only register, which stores (latches) all events that are passed by the Questionable NTR and/or PTR filter. Reading the Questionable Event register clears it. The bit configuration of the Questionable status registers is as follows:

Bit Position 15-11 10 9 8-5 4 3 2 1 0

Bit Value

Bit Name

UNR = The output is unregulated INH = The output is turned off by one of the external J1 inhibit signals OT = The output is disabled by the over-temperature protection PF = The output is disabled because AC power has failed OC = The output is disabled by the over-current protection OV = The output is disabled by the over-voltage protection

−

1024 512

UNR INH

STATus:QUEStionable:CONDition?

This query returns the value of the Questionable Condition register. That is a read-only register, which holds the real-time (unlatched) questionable status of the power supply.

−

4 2 1

−

PF OC OV

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STATus:QUEStionable:ENABle <value> STATus:QUEStionable:ENABle?

STATus:QUEStionable:NTR <value> STATus:QUEStionable:PTR <value> STATus:QUEStionable:NTR? STATus:QUEStionable:PTR?

This command and its query set and read the value of the Questionable Enable register. This register is a mask for enabling specific bits from the Questionable Event register to set the questionable summary bit (QUES) of the Status Byte register. This bit (bit 3) is the logical OR of all the Questionable Event register bits that are enabled by the Questionable Status Enable register. The Preset value = 0.

These commands set or read the value of the Questionable NTR (Negative-Transition) and PTR (Positive-Transition) registers. These registers serve as polarity filters between the Questionable Condition and Questionable Event registers to cause the following actions:

 When a bit of the Questionable NTR register is set to 1, then a 1-

to-0 transition of the corresponding bit of the Questionable Condition register causes that bit in the Questionable Event register to be set.

*CLS

 When a bit of the Questionable PTR register is set to 1, then a 0-

to-1 transition of the corresponding bit in the Questionable Condition register causes that bit in the Questionable Event register to be set.

 If the same bits in both NTR and PTR registers are set to 1, then

any transition of that bit at the Questionable Condition register sets the corresponding bit in the Questionable Event register.

 If the same bits in both NTR and PTR registers are set to 0, then

no transition of that bit at the Questionable Condition register can set the corresponding bit in the Questionable Event register.

The Preset values are: NTR = 0; PTR = 32767

This command causes the following actions on the status system:

 Clears the Standard Event Status, Operation Status Event, and

Questionable Status Event registers

 Clears the Status Byte and the Error Queue

 If *CLS immediately follows a program message terminator

(<NL>), then the output queue and the MAV bit are also cleared.

74 Series N5700 User’s Guide

ESE ESE?

Language Reference 5

This command programs the Standard Event Status Enable register bits. The programming determines which events of the Standard Event Status Event register (see *ESR?) are allowed to set the ESB (Event Summary Bit) of the Status Byte register. A "1" in the bit position enables the corresponding event.

All of the enabled events of the Standard Event Status Event Register are logically OR-ed to cause the Event Summary Bit (ESB) of the Status Byte Register to be set. The query reads the Standard Event The query reads the Standard Event Status Enable register. The bit configuration of the Standard Event register is as follows:

Bit Position 7 6 5 4 3 2 1 0

Bit Value 128

Bit Name PON

PON = Power-on has occurred CME = Command error EXE = Execution error

−

32 16 8 4

CME EXE DDE QUE

DDE = Device-dependent error QUE = Query error OPC = Operation complete

−

OPC

*ESR?

OPC OPC?

This query reads the Standard Event Status Event register. Reading the register clears it. The bit configuration is the same as the Standard Event Status Enable register (see *ESE).

This command causes the instrument to set the OPC bit (bit 0) of the Standard Event Status register when the instrument has completed all pending operations. Pending operations are complete when:

 All commands sent before *OPC have been executed. This

includes overlapped commands. Most commands are sequential and are completed before the next command is executed. Commands that affect output voltage, current or state, relays, and trigger actions are executed in parallel (or overlapped) with subsequent commands sent to the power supply. The *OPC command provides notification that all overlapped commands have been completed.

 All triggered actions are completed

*OPC does not prevent processing of subsequent commands, but bit 0 will not be set until all pending operations are completed.

*OPC? causes the instrument to place an ASCII "1" in the Output Queue when all pending operations are completed. Unlike *OPC, *OPC? prevents processing of all subsequent commands. It can be used at the end of a command line so that the program can monitor the bus for data until it receives the "1" from the Output Queue.

Series N5700 User’s Guide 75

5 Language Reference

SRE SRE?

*STB?

This command sets the condition of the Service Request Enable Register. This register determines which bits from the Status Byte Register are allowed to set the Master Status Summary (MSS) bit and the Request for Service (RQS) summary bit. A 1 in any Service Request Enable Register bit position enables the corresponding Status Byte Register bit and all such enabled bits then are logically OR-ed to cause Bit 6 of the Status Byte Register to be set.

When the controller conducts a serial poll in response to SRQ, the RQS bit is cleared, but the MSS bit is not. When *SRE is cleared (by programming it with 0), the power supply cannot generate an SRQ to the controller. The query returns the current state of *SRE.

This query reads the Status Byte register, which contains the status summary bits and the Output Queue MAV bit. Reading the Status Byte register does not clear it. The input summary bits are cleared when the appropriate event registers are read. The MAV bit is cleared at power-on, by *CLS' or when there is no more response data available.

*WAI

A serial poll also returns the value of the Status Byte register, except that bit 6 returns Request for Service (RQS) instead of Master Status Summary (MSS). A serial poll clears RQS, but not MSS. When MSS is set, it indicates that the power supply has one or more reasons for requesting service.

Bit Position 7 6 5 4 3 2

Bit Value 128 64 32 16 8 4

Bit Name OPER MSS

(RQS)

OPER = Operation status summary MSS = Master status summary (RQS) = Request for service ESB = Event status byte summary

This command instructs the power supply not to process any further commands until all pending operations are completed. Pending operations are as defined under the *OPC command. *WAI can be aborted only by sending the power supply a Device Clear command.

ESB MAV QUES ERR

MAV = Message available QUES = Questionable status summary ERR = Error queue not empty

1 − 0

−

76 Series N5700 User’s Guide

System Commands

SYSTem:COMMunicate:RLSTate LOCal|REMote|RWLock SYSTem:COMMunicate:RLSTate?

Language Reference 5

System commands control system functions that are not directly related to output control, measurement, or status functions. Common commands are also used to control system functions.

This command configures the remote/local state of the instrument according to the following settings.

LOCal The instrument is set to front panel control (front panel keys are active).

REMote The instrument is set to remote interface control (front panel keys are active).

RWLock The front panel keys are disabled (the instrument can only be controlled via the

remote interface

The remote/local state can also be set by interface commands over the GPIB and some other I/O interfaces. When multiple remote programming interfaces are active, the interface with the most recently changed remote/local state determines the instrument’s remote/local state.

The remote/local state is unaffected by *RST or any SCPI commands other than SYSTem:COMMunicate:RLState. At power-on however, the communications setting always returns to LOCal.

SYSTem:COMMunicate:TCPip:CONTrol?

This query returns the control connection port number. This is used to open a control socket connection to the instrument. Refer to chapter 4 under “Using Sockets” for more information.

SYSTem:ERRor?

This query returns the next error number and its corresponding message string from the error queue. The queue is a FIFO (first-in, first-out) buffer that stores errors as they occur. As it is read, each error is removed from the queue. When all errors have been read, the query returns 0, NO ERROR. If more errors are accumulated than the queue can hold, the last error in the queue will be -350, TOO MANY ERRORS (see Appendix C for error codes).

SYSTem:VERSion?

This query returns the SCPI version number to which the instrument complies. The returned value is of the form YYYY.V, where YYYY represents the year and V is the revision number for that year.

Series N5700 User’s Guide 77

5 Language Reference

*IDN?

*OPT?

*RCL <state>

This query requests the power supply to identify itself. It returns a string of four fields separated by commas.

Agilent Technologies xxxxxA 0 <A.xx.xx>,<A.xx.xx>

This query requests the unit to identify any installed options. A 0 indicates no options are installed.

This command restores the power supply to a state that was previously stored in memory locations 0 through 15 with the *SAV command. Note that you can only recall a state from a location that contains a previously-stored state.

Manufacturer Model number followed by a letter suffix Zero or serial number if available Firmware revision, power supply revision

NOTE

All saved instrument states are lost when the unit is turned off.

*RST

This command resets the power supply to a factory-defined state. This state is defined as follows. Note that *RST also forces an ABORt command. The *RST settings are as follows:

*SAV <state>

This command stores the present state of the power supply to memory locations 0 through 15.

NOTE

All saved instrument states are lost when the unit is turned off.

CAL:STAT Off [SOUR:]CURR:PROT:STAT Off

INIT:CONT Off [SOUR:]VOLT 0

OUTP Off [SOUR:]VOLT:LIM 0

[SOUR:]CURR 0 [SOUR:]VOLT:TRIG 0

[SOUR:]CURR:TRIG 0 [SOUR:]VOLT:PROT MAXimum

*TST?

This query always returns a zero.

78 Series N5700 User’s Guide

Trigger Commands

ABORt

INITiate[:IMMediate][:TRANsient]

INITiate:CONTinuous[:TRANsient] ON|OFF INITiate:CONTinuous[:TRANsient]?

Language Reference 5

Trigger commands consist of the Abort, Trigger, and Initiate commands.

commands

This command cancels any trigger actions in progress and returns the trigger system to the IDLE state, unless INIT:CONT is enabled. It also resets the WTG bit in the Status Operation Condition register. ABORt is executed at power-on and upon execution of *RST.

This command controls the enabling of output triggers. When a trigger is enabled, a trigger causes the specified triggering action to occur. If the trigger system is not enabled, all triggers are ignored.

Initiate commands initialize the trigger system. Trigger

control the triggering of the power supply.

This command continuously initiates output triggers. The enabled state is On (1); the disabled state is Off (0). When disabled, the trigger system must be initiated for each trigger with the INITiate command.

TRIGger[:TRANsient][:IMMediate]

If the trigger system has been initiated, this command generates an immediate output trigger. When sent, the output trigger will:

 Initiate an output change as specified by the CURR:TRIG or

VOLT:TRIG settings.

 Clear the WTG bits in the Status Operation Condition register

after the trigger action has completed.

TRIGger:SOURce BUS TRIGger:SOURce?

This command selects the trigger source for the output trigger system. Only BUS can be selected as the trigger source.

*TRG

This command generates a trigger when the trigger source is set to BUS. The command has the same affect as the Group Execute Trigger (<GET>) command.

Series N5700 User’s Guide 79

6 Programming Examples

Output Programming Example........................................................................ 82

Trigger Programming Example........................................................................84

This chapter contains several example programs to help you develop programs for your own application. The example programs are for illustration only, and are provided with the assumption that you are familiar with the programming language being demonstrated and the tools used to create and debug procedures. See Chapter 5, “Language Dictionary” for the SCPI command syntax.

NOTE

You have a royalty-free right to use, modify, reproduce and distribute the example programs (and/or any modified version) in any way you find useful, provided you agree that Agilent Technologies has no warranty, obligations, or liability for any example programs.

The example programs are written in Microsoft Visual Basic 6.0 using the VISA COM IO library. The VISA COM library must be downloaded from the Automation-Ready CD-ROM to use these programs. For information about using VISA COM in another Visual Basic project, refer to “Programming Your Instruments” in the USB/LAN/GPIB Interfaces Connectivity Guide, also included on the AutomationReady CD-ROM.

Example programs for the following programming environments are also included on the Product-Reference CD-ROM located at the back of this guide: Microsoft Visual Basic 6.0 Microsoft Visual C++ 6.0 Microsoft Excel The CD also contains IVI-COM and LabVIEW drivers for your power supply.

Series N5700 User’s Guide 81

6 Programming Examples

Output Programming Example

This program sets the voltage, current, over-voltage, and the overcurrent protection. It turns the output on and takes a voltage measurement. When done, the program checks for instrument errors

Sub main_EZ() Dim IDN As String Dim IOaddress As String Dim ErrString As String

' This variable controls the voltage Dim VoltSetting As Double

' This variable measures the voltage Dim measVolt As Double

' This variable controls the current Dim CurrSetting As Double

' These variables control the over voltage protection settings Dim overVoltSetting As Double

' These variables control the over current protection Dim overCurrOn As Long

'These variable are neccessary to initialize the VISA COM. Dim ioMgr As AgilentRMLib.SRMCls Dim Instrument As VisaComLib.FormattedIO488

' The following command line provides the program with the VISA name of the ' interface that it will communicate with. It is currently set to use GPIB. IOaddress = "GPIB0::5::INSTR"

' Use the following line for LAN communication ' IOaddress="TCPIP0::141.25.36.214"

' Use the following line instead for USB communication ' IOaddress = "USB0::2391::1799::US00000002"

' Initialize the VISA COM communication Set ioMgr = New AgilentRMLib.SRMCls Set Instrument = New VisaComLib.FormattedIO488 Set Instrument.IO = ioMgr.Open(IOaddress)

VoltSetting = 3 CurrSetting = 1.5 ' amps overVoltSetting = 10 overCurrOn = 1 '1 for on, 0 for off

With Instrument ' Send a power reset to the instrument .WriteString "*RST"

' Query the instrument for the IDN string .WriteString "*IDN?" IDN = .ReadString

' Set the voltage .WriteString "VOLT" & Str$(VoltSetting)

and gives a message if there is an error.

82 Series N5700 User’s Guide

' Set the over voltage level .WriteString "VOLT:PROT:LEV " & Str$(overVoltSetting)

' Turn on over current protection .WriteString "CURR:PROT:STAT " & Str$(overCurrOn)

' Set the current level .WriteString "CURR " & Str$(CurrSetting)

' Turn the output on .WriteString "OUTP ON"

' Make sure that the output is on before continuing .WriteString "*OPC?" .ReadString

' Measure the voltage .WriteString "Meas:Volt?" measVolt = .ReadNumber MsgBox "Measured Voltage is " & Str$(measVolt)

' Check instrument for any errors .WriteString "Syst:err?" ErrString = .ReadString

' give message if there is an error If Val(ErrString) Then MsgBox "Error in instrument!" & vbCrLf & ErrString End If End With

End Sub

Programming Examples 6

Series N5700 User’s Guide 83

6 Programming Examples

Trigger Programming Example

This example illustrates how to set up and trigger a voltage and

Sub main_Trig() Dim IDN As String Dim IOaddress As String Dim ErrString As String Dim msg1 As String

' This variable is used to monitor the status Dim stat As Long

' This variable controls the voltage Dim VoltSetting As Double

' This variable measures the voltage Dim MeasureVolt As Double

' This variable controls the current Dim CurrSetting As Double

' This variable represents the trigger current setting Dim trigCurrSetting As Double

' This variable controls the triggered voltage setting Dim trigVoltSetting As Double

' This constant represents the register value for Waiting for Trigger Const WTG = 32

' These variables are necessary to initialize the VISA COM Dim ioMgr As AgilentRMLib.SRMCls Dim Instrument As VisaComLib.FormattedIO488

' The following line provides the VISA name of the GPIB interface IOaddress = "GPIB0::5::INSTR"

' Use the following line instead for LAN communication ' IOaddress="TCPIP0::141.25.36.214"

' Use the following line instead for USB communication ' IOaddress = "USB0::2391::1799::US00000002"

' Initialize the VISA COM communication Set ioMgr = New AgilentRMLib.SRMCls Set Instrument = New VisaComLib.FormattedIO488 Set Instrument.IO = ioMgr.Open(IOaddress)

VoltSetting = 3 ' volts CurrSetting = 2 ' amps trigVoltSetting = 5 ' volts trigCurrSetting = 3 ' amps

With Instrument ' Send a power reset to the instrument .WriteString "*RST"

' Query the instrument for the IDN string .WriteString "*IDN?" IDN = .ReadString

current change. The voltage is measured before and after the trigger.

84 Series N5700 User’s Guide

Programming Examples 6

' Set the voltage .WriteString "VOLT" & Str$(VoltSetting)

' Set the current level .WriteString "CURR " & Str$(CurrSetting)

' Set the triggered voltage and current levels .WriteString "VOLT:TRIG " & Str$(trigVoltSetting) .WriteString "CURR:TRIG " & Str$(trigCurrSetting)

' Turn the output on .WriteString "OUTP ON"

' Make sure that the output is on .WriteString "*OPC?" .ReadString

' Measure the voltage before triggering the change .WriteString "MEAS:VOLT?" MeasureVolt = .ReadNumber

' Save the value for later display msg1$ = "Voltage before trigger = " & Str$(MeasureVolt)

' Initiate the trigger system .WriteString "INIT"

' Make sure that the trigger system is initiated Do .WriteString "STAT:OPER:COND?" stat = .ReadNumber Loop Until ((stat And WTG) = WTG)

' Trigger the unit .WriteString "*TRG"

'Make sure that the trigger is done .WriteString "*OPC?" .ReadString

' Measure the voltage after triggering the change .WriteString "MEAS:VOLT?" MeasureVolt = .ReadNumber

' Display the measured values MsgBox msg1$ + Chr$(13) + "Voltage after trigger = " & Str$(MeasureVolt)

' Check instrument for any errors .WriteString "Syst:err?" ErrString = .ReadString

' Give message if there is an error If Val(ErrString) Then MsgBox "Error in instrument!" & vbCrLf & ErrString End If End With

End Sub

Series N5700 User’s Guide 85

Appendix A Specifications

Performance Specifications ............................................................................ 88

Supplemental Characteristics .........................................................................89

Outline Diagram.................................................................................................91

This chapter lists the specifications and supplemental characteristics of the Agilent N5700 power supplies. A dimensional line drawing of the unit is included at the end of the chapter.

Unless otherwise noted, specifications are warranted over the ambient temperature range of 0 to 40°C. Sensing is at the rear terminals of the power supply after a 30-minute warm-up period. Sense terminals are externally jumpered to their respective output terminals.

Supplemental characteristics are not warranted but are descriptions of typical performance determined either by design or type testing.

Series N5700 User’s Guide 87

Appendix A Specifications

Performance Specifications

Agilent Models N5741A – N5752A and N5761A – N5772A

Model

DC Output Ratings:

N5741A N5761A

NOTE 1

N5742A N5762A

N5743A N5763A

N5744A N5764A

N5745A N5765A

N5746A N5766A

N5747A N5767A

N5748A N5768A

N5749A N5769A

N5750A N5770A

N5751A N5771A

N5752A N5772A

Voltage 6V 8V 12.5V 20V 30V 40V 60V 80V 100V 150V 300V 600V

Current 750W 100A 90A 60A 38A 25A 19A 12.5A 9.5A 7.5A 5A 2.5A 1.3A

Current 1500W 180A 165A 120A 76A 50A 38A 25A 19A 15A 10A 5A 2.6A

Power 750W 600W 720W 750W 760W 750W 760W 750W 760W 750W 750W 750W 780W

Power 1500W 1080W 1320W 1500W 1520W 1500W 1520W 1500W 1520W 1500W 1500W 1500W 1560W

Output Ripple and Noise:

NOTE 2

CV p-p

CV rms

60mV 60mV 60mV 60mV 60mV 60mV 60mV 80mV 80mV 100mV 150mV 300mV

NOTE 3

8mV 8mV 8mV 8mV 8mV 8mV 8mV 8mV 8mV 12mV 20mV 60mV

Load Effect: (change from 10% to 90% of full load)

Voltage 2.6mV 2.8mV 3.25mV 4mV 5mV 6mV 8mV 10mV 12mV 17mV 32mV 62mV

Current 750W 25mA 23mA 17mA 12.6mA 10mA 8.8mA 7.5mA 6.9mA 6.5mA 6mA 5.5mA 5.26mA

Current 1500W 41mA 38mA 29mA 20.2mA 15mA 12.6mA 10mA 8.8mA 8mA 7mA 6mA 5.5mA

Source Effect: (change from 85-132 VAC input or 170-265 VAC input)

Voltage 2.6mV 2.8mV 3.25mV 4mV 5mV 6mV 8mV 10mV 12mV 17mV 32mV 62mV

Current 750W 12mA 11mA 8mA 5.8mA 4.5mA 3.9mA 3.25mA 2.95mA 2.75mA 2.5mA 2.25mA 2.13mA

Current 1500W 20mA 18.5mA 14mA 9.6mA 7mA 5.8mA 4.5mA 3.9mA 3.5mA 3mA 2.5mA 2.26mA

Programming Accuracy:

NOTE 1

Voltage 0.05%+ 3mV 4mV 6.25mV 10mV 15mV 20mV 30mV 40mV 50mV 75mV 150mV 300mV

Current 750W 0.1%+ 100mA 90mA 60mA 38mA 25mA 19mA 12.5mA 9.5mA 7.5mA 5mA 2.5mA 1.3mA

Current 1500W 0.1%+ 180mA 165mA 120mA 76mA 50mA 38mA 25mA 19mA 15mA 10mA 5mA 2.6mA

Measurement Accuracy:

Voltage 0.1%+ 6mV 8mV 12.5mV 20mV 30mV 40mV 60mV 80mV 100mV 150mV 300mV 600mV

Current 750W 0.1%+ 300mA 270mA 180mA 114mA 75mA 57mA 37.5mA 28.5mA 22.5mA 15mA 7.5mA 3.9mA

Current 1500W 0.1%+ 540mA 495mA 360mA 228mA 150mA 114mA 75mA 57mA 45mA 30mA 15mA 7.8mA

Load Transient Recovery Time: (time for output voltage to recover within 0.5% of its rated output for a load change from 10 to 90% of its rated output current)

Time ≤ 1.5ms ≤ 1.5ms ≤ 1.5ms ≤ 1ms ≤ 1ms ≤ 1ms ≤ 1ms ≤ 1ms ≤ 1ms ≤ 2ms ≤ 2ms ≤ 2ms

Voltage set point from 10% to 100% of rated output

NOTE 1

Minimum voltage is guaranteed to a maximum of 0.2% of the rated output voltage.

Minimum current is guaranteed to a maximum of 0.4% of the rated output current.

NOTE 2

20MHz

NOTE 3

From 5Hz - 1MHz

88 Series N5700 User’s Guide

Supplemental Characteristics

Agilent Models N5741A – N5752A and N5761A – N5772A

Specifications Appendix A

Model

N5741A N5761A

N5742A N5762A

N5743A N5763A

N5744A N5764A

N5745A N5765A

N5746A N5766A

N5747A N5767A

N5748A N5768A

N5749A N5769A

N5750A N5770A

N5751A N5771A

N5752A N5772A

Output Response Time: (to settle to within ±1.0% of the rated output, with a resistive load)

Up, full load 0.08s 0.08s 0.08s 0.08s 0.08s 0.08s 0.08s 0.15s 0.15s 0.15s 0.15s 0.25s

Down, full load 0.05s 0.05s 0.05s 0.05s 0.08s 0.08s 0.08s 0.15s 0.15s 0.15s 0.15s 0.30s

Down, no load 0.5s 0.6s 0.7s 0.8s 0.9s 1.0s 1.1s 1.2s 1.5s 2.0s 3.0s 4s

Command Response Time: (add this to the output response time to obtain the total programming time)

55 ms

Remote Sense Compensation:

Volts/load lead 1V 1V 1V 1V 1.5V 2V 3V 4V 5V 5V 5V 5V

Over-voltage Protection:

Range

Accuracy 0.06V 0.08V 0.125V 0.20V 0.30V 0.40V 0.60V 0.80V 1V 1.5V 3V 6V

0.5-7.5V 0.5-10V 1-15V 1-24V 2-36V 2-44V 5-66V 5-88V 5-110V 5-165v 5-330V 5-660V

Output Ripple and Noise: (From 5Hz-1MHz, at 10% to 100% of output voltage at full load (for 6V units from 33% to 100% of output voltage)

CC rms 750W 200mA 180mA 120mA 76mA 63mA 48mA 38mA 29mA 23mA 18mA 13mA 8mA

CC rms 1500W 360mA 330mA 240mA 152mA 125mA 95mA 75mA 57mA 45mA 35mA 25mA 12mA

Programming Resolution: Measurement Resolution:

Voltage 0.72mV 0.96mV 1.5mV 2.4mV 3.6mV 4.8mV 7.2mV 9.6mV 12mV 18mV 36mV 72mV

Current 750W 12mA 10.8mA 7.2mA 4.56mA 3mA 2.3mA 1.5mA 1.14mA 0.9mA 0.6mA 0.3mA 0.156mA

Current 1500W 21.6mA 19.8mA 14.4mA 9.12mA 6mA 4.6mA 3mA 2.28mA 1.8mA 1.2mA 0.6mA 0.312mA

Front Panel Display Accuracy: (4 digits; ± 1 count)

Voltage 30mV 40mV 62.5mV 100mV 150mV 200mV 300mV 400mV 500mV 750mV 1.5 V 3 V

Current 750W 500mA 450mA 300mA 190mA 125mA 95mA 62.5mA 47.5mA 37.5mA 25mA 12.5mA 6.5mA

Current 1500W 900mA 825mA 600mA 380mA 250mA 190mA 125mA 95mV 75mA 50mA 25m 13mA

Temperature Drift: (over 8 hours, after a 30 minute warm-up, with constant line, load, and temperature)

Voltage 3mV 4mV 6.25mV 10mV 15mV 20mV 30mV 40mV 50mV 75mV 150mV 300mV

Current 750W 50mA 45mA 30mA 19mA 12.5mA 9.5mA 6.25mA 4.75mA 3.75mA 2.5mA 1.25mA 6.5mA

Current 1500W 90mA 82.5mA 60mA 38mA 25mA 19mA 12.5mA 9.5mA 7.5mA 5mA 2.5mA 1.3mA

Temperature Coefficient: (after a 30 minute warm-up)

Voltage and Current 100PPM/°C from rated output voltage or current

Analog Programming and Monitoring:

Vout voltage 0 - 100%, 0-5V/10V, user selectable, Accuracy & linearity = +/-0.5% of rated Vout Iout voltage 0 - 100%, 0-5V/10V, user selectable, Accuracy & linearity = +/-1% of rated Iout Vout resistance Iout resistance Iout monitor 0-5V/10V, user selectable, Accuracy = 1% Vout monitor 0-5V/10V, user selectable, Accuracy = 1% On/Off control Electrical voltage; 0-6V/2-15V or dry contact, user selectable logic PS OK signal CV/CC signal CV = TTL high (4-5V) source current 10mA; CC = TTL high (4-5V) sink current 10mA Enable/Disable Dry contact. Open=Off, Short=On. Maximum voltage at terminal= 6V.

0 - 100%, 0-5kΩ/10kΩ, user selectable, Accuracy & linearity = +/-1% of rated Vout 0 - 100%, 0-5kΩ/10kΩ, user selectable, Accuracy & linearity = +/-1.5% of rated Iout

5V = OK; 0V = FAIL; 500Ω series resistance

Series N5700 User’s Guide 89

Appendix A Specifications

Agilent Models N5741A – N5752A and N5761A – N5772A

Model

N5741A N5761A

N5742A N5762A

N5743A N5763A

N5744A N5764A

N5745A N5765A

N5746A N5766A

N5747A N5767A

N5748A N5768A

N5749A N5769A

N5750A N5770A

N5751A N5771A

N5752A N5772A

Series and Parallel Capability:

Parallel operation Up to 4 identical units can be connected in master/slave mode with single–wire current balancing

Series operation Up to 2 identical units can be connected using external protection diodes

Savable states:

In volatile memory 16 (in memory locations 0-15)

Interface Capabilities:

GPIB LXI Compliance USB 2.0 10/100 LAN

SCPI - 1993, IEEE 488.2 compliant interface Class C (only apples to units with the LXI label on the front panel) Requires Agilent IO Library version L.01.01 and up, or 14.0 and up Requires Agilent IO Library version L.01.01 and up, or 14.0 and up

Environmental Conditions:

Environment

Operating temp.

Storage temp.

Operating humidity

Storage humidity

Altitude

LED statement

Indoor use, installation category II (AC input), pollution degree 2

0°C to 40°C @ 100% load

–20°C to 70°C

30% to 90% relative humidity (no condensation)

10% to 95% relative humidity (no condensation)

Up to 3000 meters. Above 2000m, derate the output current by 2%/100m and derate the maximum ambient temperature by 1°C/100m. (For 1500W models from 60V to 600V, derate either the output current or the ambient temperature, but not both.)

Any LEDs used in this product are Class 1 LEDs as per IEC 825-1

Regulatory Compliance:

EMC

Safety

Complies with the European EMC directive 89/336/EEC for Class A test and measurement products. Complies with the Australian standard and carries the C-Tick mark. This ISM device complies with Canadian ICES-001. Cet appareil ISM est conforme à la norme NMB-001 du Canada.

Electrostatic discharges >1kV near the I/O connectors may cause the unit to reset and require operator intervention.

Complies with the European Low Voltage Directive 73/23/EEC and carries the CE-marking. Complies with the US and Canadian safety standards for test and measurement products.

Acoustic Noise Declaration:

Statements provided to comply with requirements of the German Sound Emission Directive, from 18 January 1991:

Sound Pressure Lp <70 dB(A), * At Operator Position, * Normal Operation, * According to EN 27779 (Type Test).

Schalldruckpegel Lp <70 dB(A) * Am Arbeitsplatz, * Normaler Betrieb, * Nach EN 27779 (Typprüfung).

Output Terminal Isolation:

6V to 60V units No output terminal may be more than +/- 60 VDC from any other terminal or chassis ground

80V to 600V units No output terminal may be more than +/- 600 VDC from any other terminal or chassis ground

AC Input:

Nominal Input

Input Current 750W

Input Current 1500W

Input Range

Power Factor

Efficiency

Inrush Current

100 – 240 VAC; 50/60Hz

10.5A @ 100 VAC nominal; 5A @ 200 VAC nominal

21A @ 100 VAC nominal; 11A @ 200 VAC nominal

85 – 265 VAC; 47 – 63 Hz.

0.99 at nominal input and rated output power

76% – 87% for 750W units; 77% – 88% for 1500W units

< 25A for 750W units; < 50 A for 1500W units

90 Series N5700 User’s Guide

Outline Diagram

Specifications Appendix A

43.6mm

57.8+/-0.5

POWER

A

AA

100V/7.5A 750W

N5749A

System DC Power Supply

482.8+/-1.0mm

422.8+/-1.0mm

10/100 Ethernet

+S+LSNC-LC-S

SW1

1 2 3 4 5 6 7 8 9

OFF

GPIB

ANALOG PR OGRAMMIN G

LINK

NOT ACTIVE

+V -V

507.0+/-1.0mm

AAA

92.0+/-0.5 92.0+/-0.5

21.0

433+/-1.0mm

VOLTAGE DC VOLTS DC AMPS CURRENT

OVP

PROT FINE LIMIT UVL OCP REM OUT ON

AC INPUT

Strain-Relief Detail

1500W Models

Bus-Bar Detail

6V to 60V Models

3.0mm

35m

30.0mm

NOTES:

Holes marked “A” are for chassis slide mounting. Use only screws designated #10-32x0.38” maximum.

22.0mm

8.5mm

Series N5700 User’s Guide 91

Appendix B Verification and Calibration

Verification ......................................................................................................... 94

Calibration ........................................................................................................113

The verification procedures described in this appendix verify that the power supply is operating normally and is within published specifications.

This appendix also includes calibration procedures for the Agilent N5700 power supplies. Instructions are given for performing the procedures from a controller over the GPIB.

NOTE

Perform the verification tests before calibrating your power supply. If the power supply passes the verification tests, the unit is operating within its calibration limits and does not need to be re-calibrated.

The recommended calibration interval for Agilent N5700 power supplies is one year.

Series N5700 User’s Guide 93

Appendix B Verification and Calibration

Verification

Verification procedures verify that the power supply is operating normally and is within published specifications. There are two types of verification tests:

Performance These tests verify that the power supply meets all of the specifications listed

Calibration These procedures calibrate the power supply.

If the power supply fails any of the tests or if abnormal test results are obtained, try calibrating the unit. If calibration is unsuccessful, return the unit to an Agilent Technologies repair facility (see Appendix D).

Equipment Required

The equipment listed in the following table, or the equivalent to this equipment, is required for the calibration and performance tests. A test record sheet may be found at the back of this section.

Type Specifications Recommended Model

Digital Voltmeter Resolution: 10 nV @ 1V;

Readout: 8 1/2 digits Accuracy: 20 ppm

Current Monitor

Load Resistor For 750 W models:

Electronic Load 150 V, 100 A minimum (for Models N5741- N5750A)

GPIB Controller Full GPIB capabilities (for calibrating the unit over the GPIB) Agilent 82350B or

Oscilloscope Sensitivity: 1 mV

RMS Voltmeter True RMS

Differential Amplifier Bandwidth: 20 MHz LaCroy 1855A, DA1850A,

Terminations

Variable-voltage xfmr or AC source

15 A (0.1Ω) 0.04%, TC=5ppm/°C 100 A (0.01Ω) 0.04%, TC=5ppm/°C 300 A (0.001Ω) 0.04%, TC=5ppm/°C

0.06Ω, 0.09Ω, 0.21Ω, 0.53Ω, 1.20Ω, 2.11Ω, 4.80Ω, 8.42Ω,

13.33Ω, 30.0Ω, 120Ω, 462Ω - all resistors 1kW minimum. For 1500 W models:

0.03Ω, 0.04Ω, 0.10Ω, 0.26Ω, 0.60Ω, 1.05Ω, 2.40Ω, 4.21Ω,

6.67Ω, 15.0Ω, 60Ω, 231Ω - all resistors 2kW minimum.

150 V, 180 A minimum (for Models N5761- N5770A)

Bandwidth Limit: 20 MHz Probe: 1:1 with RF tip

Bandwidth: 20 MHz Sensitivity: 100 µV

1 – 50Ω BNC termination 2 – 50Ω, 1/8 W termination resistors

Adjustable to highest rated input voltage range. Power: 2000 VA

in Appendix A. They can also be used to verify that the power supply is properly calibrated.

Agilent 3458A or equivalent

Guildline 9230/15 Guildline 9230/100 Guildline 9230/300

Agilent N3300A mainframe, with 3 - N3305A modules

equivalent

Agilent Infiniium or equivalent

Rhode and Schwartz Model URE3 or equivalent

or equivalent

Agilent 6813B or equivalent

94 Series N5700 User’s Guide

Measurement Techniques

Electronic Load

Many of the test procedures require the use of a variable load capable of dissipating the required power. If a variable resistor is used, switches should be used to either; connect, disconnect, or short the load resistor. For most tests, an electronic load can be used. The electronic load is considerably easier to use than load resistors, but it may not be fast enough to test transient recovery time and may be too noisy for the noise (PARD) tests.

Fixed load resistors may be used in place of a variable load, with minor changes to the test procedures. Also, if computer controlled test setups are used, the relatively slow (compared to computers and system voltmeters) settling times and slew rates of the power supply may have to be taken into account. "Wait" statements can be used in the test program if the test system is faster than the power supply.

Current-Monitoring Resistor

The 4-terminal current shunt is used to eliminate output current measurement error caused by voltage drops in the load leads and connections. It has special current-monitoring terminals inside the load connection terminals. Connect the voltmeter directly to these current-monitoring terminals.

Verification and Calibration Appendix B

Power Supply

+S +LS -LS -S

DC voltmeter,

scope, or

rms voltmeter

Test Set-up

The following figure illustrates the test set-up used for the verification procedures.

+V -V

Electronic load

or resistor

Power Supply

+S +LS -LS -S

DC voltmeter,

scope, or

rms voltmeter

+V -V

Current

shunt

Electronic load

or resistor

Power Supply

+S +LS -LS -S

50 50

BNC

+V -V

Load

Resistor

Differential

amplifier

output

BNC

50 ohm

termination

input

Scope or

rms voltmeter

BNC

Series N5700 User’s Guide 95

Appendix B Verification and Calibration

Constant Voltage Tests

NOTE

Refer to the appropriate test record form for the instrument settings of the model you are checking.

Voltage Programming and Readback Accuracy

Test category = performance, calibration

This test verifies that the voltage programming and measurement functions are within specifications.

1 Turn off the power supply and connect a DVM directly across the

+S and -S terminals as shown in figure A. Do not connect a load.

2 Turn on the power supply and program the output voltage to zero

and the output current to its maximum programmable value (Imax) with the load off. The CV annunciator should be on and the output current reading should be approximately zero.

3 Record the output voltage readings on the digital voltmeter

(DVM) and the front panel display. The readings should be within the limits specified in the test record card for the appropriate model under Voltage Programming and Readback, Minimum Voltage Vout.

4 Program the output voltage to its full-scale rating.

5 Record the output voltage readings on the DVM and the front

panel display. The readings should be within the limits specified in the test record card for the appropriate model under Voltage Programming and Readback, High Voltage Vout.

CV Load Effect

Test category = performance

This test measures the change in output voltage resulting from a change in output current from full load to no load.

1 Turn off the power supply and connect a DVM and an electronic

load as shown in figure A.

2 Turn on the power supply and program the output current to its

maximum programmable value (Imax) and the output voltage to its full-scale value.

3 Set the electronic load for the output’s full-scale current. The CV

annunciator on the front panel must be on. If it is not, adjust the load so that the output current drops slightly.

4 Record the output voltage reading from the DVM.

5 Open the load and record the voltage reading from the DVM

again. The difference between the DVM readings in steps 4 and 5 is the load effect, which should not exceed the value listed in the test record card for the appropriate model under CV Load Effect.

96 Series N5700 User’s Guide

Verification and Calibration Appendix B

CV Source Effect

Test category = performance

This test measures the change in output voltage that results from a change in AC line voltage from the minimum to maximum value within the line voltage specifications.

1 Turn off the power supply and connect the ac power line through

a variable voltage transformer.

2 Connect a DVM and an electronic load as shown in figure A. Set

the variable voltage transformer to nominal line voltage.

3 Turn on the power supply and program the output current to its

maximum programmable value (Imax) and the output voltage to its full-scale value.

4 Set the electronic load for the output’s full-scale current. The CV

annunciator on the front panel must be on. If it is not, adjust the load so that the output current drops slightly.

5 Adjust the transformer to the low-line voltage (85 VAC for

100/120 nominal line; 170 VAC for 200/240 nominal line).

6 Record the output voltage reading from the DVM.

7 Adjust the transformer to the high-line voltage (132 VAC for

100/120 nominal line; 265 VAC for 200/240 nominal line).

8 Record the output voltage reading on the DVM. The difference

between the DVM reading in steps 6 and 8 is the source effect, which should not exceed the value listed in the test record card for the appropriate model under CV Source Effect.

CV Noise

Test category = performance

Periodic and random deviations in the output combine to produce a residual AC voltage superimposed on the DC output voltage. This residual voltage is specified as the rms or peak-to-peak output voltage in the frequency range specified in Appendix A.

1 Turn off the power supply and connect the load resistor,

differential amplifier, and an oscilloscope (ac coupled) to the output as shown in figure C. Use the indicated load resistor for 750W outputs; use the indicated load resistor for 1500W outputs.

2 As shown in the diagram, use two BNC cables to connect the

differential amplifier to the + and − output terminals. Each cable should be terminated by a 50 Ω resistor. The shields of the two BNC cables should be connected together. Connect the output of the differential amplifier to the oscilloscope with a 50 Ω termination at the input of the oscilloscope.

3 Set the differential amplifier to multiply by ten, divide by one,

and 1 Megohm input resistance. The positive and negative inputs of the differential amplifier should be set to AC coupling. Set the oscilloscope’s time base to 5 ms/div, and the vertical scale to 10 mV/div. Turn the bandwidth limit on (usually 20 or 30 MHz), and set the sampling mode to peak detect.

Series N5700 User’s Guide 97

Appendix B Verification and Calibration

4 Program the power supply to program the output current to its

5 Disconnect the oscilloscope and connect an ac rms voltmeter in

Transient Recovery Time

Test category = performance

maximum programmable value (Imax) and the output voltage to its full-scale value and enable the output. Let the oscilloscope run for a few seconds to generate enough measurement points. On the Agilent Infiniium scope, the maximum peak-to-peak voltage measurement is indicated at the bottom of the screen on the right side. Divide this value by 10 to get the CV peak-to-peak noise measurement. The result should not exceed the peak-to-peak limits in the test record form for the appropriate model under CV Ripple and Noise, peak-to-peak. (If the measurement contains any question marks, clear the measurement and try again. This means that some of the data received by the scope was questionable.)

its place. Do not disconnect the 50 Ω termination. Divide the reading of the rms voltmeter by 10. The result should not exceed the rms limits in the test record card for the appropriate model under CV Ripple and Noise - rms.

This measures the time for the output voltage to recover to within the specified value following a 10% to 90% change in the load current.

1 Turn off the power supply and connect the output as in figure A

with the oscilloscope across the +S and -S terminals.

2 Turn on the power supply and program the output current to its

maximum programmable value (Imax) and the output voltage to its full-scale value. Do not program voltages greater than 200 VDC when testing the 300 and 600 volt models.

3 Set the electronic load to operate in constant current mode.

Program its load current to 10% of the power supply’s full-scale current value.

4 Set the electronic load's transient generator frequency to 100 Hz

and its duty cycle to 50%.

5 Program the load's transient current level to 90% of the power

supply's full-scale current value. Turn the transient generator on.

6 Adjust the oscilloscope for a waveform similar to that shown in

the following figure.

7 The output voltage should return to within the specified voltage

in the specified time following the 10% to 90% load change. Check both loading and unloading transients by triggering on the positive and negative slope. Record the voltage at time “t” in the performance test record card under Transient Response.

tttt

Transient

Unloading

Transient

98 Series N5700 User’s Guide

Constant Current Tests

Verification and Calibration Appendix B

NOTE

Refer to the appropriate test record form for the instrument settings of the model you are checking.

Current Programming and Readback Accuracy

Test category = performance, calibration

This test verifies that the current programming and measurement functions are within specifications.

1 Turn off the power supply and connect the current shunt directly

across the output. Connect the DVM across the current shunt.

2 Turn on the power supply and program the output voltage to its

full-scale value and the output current to zero. The CC annunciator should be on and the output voltage reading should be approximately zero.

3 Divide the voltage drop (DVM reading) across the current shunt

by its resistance to convert to amps and record this value (Iout). Also record the current reading on the front panel display. The readings should be within the limits specified in the test record card for the appropriate model under Current Programming and Readback, Minimum Current Iout.

4 Program the output current to its full-scale rating.

5 Divide the voltage drop (DVM reading) across the current shunt

CC Load Effect

Test category = performance

This test measures the change in output current resulting from a change in output voltage from full scale to short circuit.

1 Turn off the power supply and connect the current shunt, DVM,

and electronic load as shown in figure B. Connect the DVM directly across the current shunt.

2 To ensure that the values read during this test are not the

instantaneous measurement of the AC peaks of the output current ripple, several DC measurements should be made and averaged. If you are using an Agilent 3458A, you can set up the voltmeter to do this automatically. From the instrument’s front panel, program 100 power line cycles per measurement. Press NPLC 100 ENTER.

3 Turn on the power supply and program the output current to its

full-scale value and the output voltage to its maximum programmable value (Vmax).

Series N5700 User’s Guide 99

Appendix B Verification and Calibration

4 With the electronic load in CV mode, set it for the output’s full-

5 Divide the voltage drop (DVM reading) across the current

6 Short the electronic load. Divide the voltage drop (DVM reading)

CC Source Effect

Test category = performance

This test measures the change in output current that results from a change in AC line voltage from the minimum to maximum value within the line voltage specifications.

1 Turn off the power supply and connect the ac power line through

2 Connect the current shunt, DVM, and electronic load as shown in

3 To ensure that the values read during this test are not the

4 Turn on the power supply and program the output current to its

5 With the electronic load in CV mode, set it for the output’s full-

6 Adjust the transformer to the lowest rated line voltage (85 VAC

7 Divide the voltage drop (DVM reading) across the current

8 Adjust the transformer to the highest rated line voltage (132 VAC

9 Divide the voltage drop (DVM reading) across the current shunt

scale voltage. The CC annunciator on the front panel must be on. If it is not, adjust the load so that the voltage drops slightly.

monitoring resistor by its resistance to convert to amps and record this value (Iout).

across the current shunt by its resistance to convert to amps and record this value (Iout). The difference in the current readings in steps 4 and 5 is the load effect, which should not exceed the value listed in the test record card for the appropriate model under CC Load Effect.

a variable voltage transformer or AC source.

figure B. Connect the DVM directly across the current shunt. Set the variable voltage transformer to nominal line voltage.

full-scale value and the output voltage to its maximum programmable value (Vmax).

scale voltage. The CC annunciator on the front panel must be on. If it is not, adjust the load so that the voltage drops slightly.

for 100/120 nominal line; 170 VAC for 200/240 nominal line).

monitoring resistor by its resistance to convert to amps and record this value (Iout).

for 100/120 nominal line; 265 VAC for 200/240 nominal line).

by its resistance to convert to amps and record this value (Iout). The difference between the DVM reading in steps 6 and 8 is the source effect, which should not exceed the value listed in the test record card for the appropriate model under CC Source Effect.

100 Series N5700 User’s Guide

Agilent N5741A Users Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

The Agilent N5700 DC Power Supplies – At a Glance

Output Features

System Features

Programmable Functions

Model Ratings

The Front Panel - At a Glance

The Rear Panel – At a Glance

J2 Sense Connector

SW1 Setup Switch

J1 Analog Programming Connector

General Information

Models

Items Supplied

Accessories

Inspecting the Unit

Installing the Unit

Safety Considerations

Environment

Airflow

Rack Installation

Cleaning

Connecting the Line Cord

Input Connections for 750W units

Input Connections for 1500W units

Connecting the Load

Wire Size

Load Connections for 6V to 60V Models

Load Connections for 80V to 600V Models

Output Voltage Sensing

Local Sensing

Remote Sensing

Load Considerations

Multiple Loads

Output Noise and Impedance Effects

Inductive Loads

Grounding the Output

Parallel Connections

Setting up the Master Unit

Setting up the Slave Units

Setting the Over-Voltage Protection

Setting the Over-Current Protection

Series Connections

J1 Connector Connections

Turn-On Check-Out

Before Check-Out

Constant Voltage Check

OVP Check

UVL Check

Constant Current Check

OCP Check

Normal Operation

Constant Voltage Mode

Constant Current Mode

CV/CC Mode Crossover

CV/CC Signal

Protection Functions

Over-Voltage Protection

Under-Voltage Limit

Over-Current Protection

Over-Temperature Protection

Power-Fail Protection

Front Panel Lock-Out

Output On/Off Controls

OUT ON button

Safe-Start and Auto-Restart

Output Shut-Off Terminals

Enable/Disable Terminals

Power Supply OK Signal

Daisy-Chained Output Shut-down

Analog Programming of Output Voltage and Current

Analog Programming Control Terminals

Voltage Programming of Output Voltage and Current

Resistance Programming of Output Voltage and Current

External Monitoring of Output Voltage and Current

Connecting to the Interfaces

GPIB Interface

ESE ESE?

OPC OPC?

SRE SRE?