Agilent Technologies System DC N5700 User Manual

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.

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 2, July, 2004 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.

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

If software is for use in the performance of a U.S. Government prime contract or subcontract, Software is delivered and licensed as “Commercial computer software” as defined in DFAR 252.2277014 (June 1995), or as a “commercial item” as defined in FAR 2.101(a) or as “Restricted computer software” as defined in FAR 52.227-19 (June 1987) or any equivalent agency regulation or contract clause. Use, duplication or disclosure of Software is subject to Agilent Technologies’ standard commercial license terms, and non-DOD Departments and Agencies of the U.S. Government will receive no greater than Restricted Rights as defined in FAR

52.227-19(c)(1-2) (June 1987). U.S. Government users will receive no greater than Limited Rights as defined in FAR

52.227-14 (June 1987) or DFAR 252.2277015 (b)(2) (November 1995), as applicable in any technical data.

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

For continued protection against fire, replace the line fuse only with a fuse of the specified type and rating (normal blow, time delay, etc.). Do not use repaired fuses or short-circuited fuseholders. To do so could cause a shock or fire hazard.

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 7

The Agilent N5700 DC Power Supplies – At a Glance 8

The Front Panel - At a Glance 10

The Rear Panel – At a Glance 12

SCPI Programming Commands – At a Glance. 15

2 Installation 17

General Information 18

Inspecting the Unit 19

Installing the Unit 19

Connecting the Line Cord 21

Connecting the Load 23

Output Voltage Sensing 26

Load Considerations 28

Parallel Connections 30

Series Connections 32

J1 Connector Connections 34

3 Operating the Power Supply Locally 35

Turn-On Check-Out 36

Normal Operation 38

Protection Functions 39

Output On/Off Control 42

Analog Programming of Output Voltage and Current 44

4 Operating the Power supply Remotely 49

Configuring the Interface 50

SCPI Commands – an Introduction 59

5 Language Reference 65

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 81

Output Programming Example 82

Trigger Programming Example 83

A Specifications 85

Performance Specifications 86

Supplemental Characteristics 87

Outline Diagram 89

B Verification and Calibration 91

Verification 92

Calibration 111

C Service 113

Types of Service Available 114

Repackaging for Shipment 114

Operating Checklist 114

Error Messages 116

D Compatibility 121

Differences – In General 122

Compatibility Command Summary 123

Index 125

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

SCPI Programming Commands – At a Glance. 15

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 or programming command.

Series N5700 User’s Guide 7

The Agilent N5700 DC Power Supplies – At a Glance

The Agilent Technologies Series N5700 System DC Power Supplies are general-purpose switching power supplies 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

• Constant voltage/constant current with automatic crossover.

System Features

• 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

The Agilent N5700 DC Power Supplies – At a Glance

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

Current Range

Model Voltage

Range

Current Range

Series N5700 User’s Guide 9

The Front Panel - At a Glance

LIMIT/

OVP UVL

DC AMPS

OCP REM OUT ON

CURRENT

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 REM 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.

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 REM is pressed and held, the display indicates the GPIB 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.

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

The Front Panel - At a Glance

9 – REM button Mode function

disabled with a Local Lockout command).

: Press REM to put the unit into local mode. (This button can be

Address function: Selects the GPIB address. Press and hold the REM button for three seconds to set the address with the Voltage knob.

10 – REM indicator When lit, indicates that the unit is in Remote mode.

11 – OCP button Enable function

: Press OCP to turn over-current protection on. Press OCP 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.

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 with the Voltage knob (the display shows UUL).

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

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.

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

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

blink. 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

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

The Rear Panel – At a Glance

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 programming 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

The Rear Panel – At a Glance

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

SCPI Programming Commands – At a Glance.

NOTE

Some [optional] commands have been included for clarity. Chapter 6 contains a complete description of all programming commands.

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 “<date>” 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

Series N5700 User’s Guide 15

SCPI Programming Commands – At a Glance.

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

16 Series N5700 User’s Guide

2 Installation

General Information 18

Inspecting the Unit 19

Installing the Unit 19

Connecting the Line Cord 21

Connecting the Load 23

Output Voltage Sensing 26

Load Considerations 28

Parallel Connections 30

Series Connections 32

J1 Connector Connections 34

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 17

General Information

Models

Options

Accessories

750 W Models 1500 W Models

N5741A – N5749A N5761A – N5769A

N5750A – N5752A N5770A – N5772A

Option Description

Item Description

N5740A Rack-mount Slide Kit for installing in system II style cabinets

Items Supplied

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

Sense Connector A 5-pin connector for local/remote sense connections

Analog connector A DB25 subminiature connector plug for analog control

connections

Shield assembly A safety shield for the output terminal connections

Strain relief assembly A strain relief assembly for unterminated power cords

(only provided for 1500W units)

Documentation Set Contains User’s Guide and CD-ROM

CD-ROM contains Agilent I/O library, Setup utility, GPIB/LAN/USB Interfaces Connectivity Guide, User’s Guide

18 Series N5700 User’s Guide

Inspecting the Unit

Installing the Unit

Safety Considerations

Inspecting the Unit

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 19

Installing the Unit

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 of the unit 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. 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 three #10-32 x

0.38 in (max.) screws at each side. To prevent internal damage, use the specified screw length only.

Cleaning

WARNING

20 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

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 21

Connecting the Line Cord

• Unscrew the base of the strain relief from the helix-shaped body. Insert the base through the outside opening in the AC input cover and screw the locknut securely (11-14 in-lb) into the base, from the inside.

• Slide the helix-shaped body onto the AC cable. Insert the stripped wires through the strain relief base until the outer cable jacket is flush with the edge of the base. Tighten the body (16-18 in-lb) to the base while holding the cable in place. Now the cable is securely fastened inside the strain relief. Refer to the following figure.

Screw-on Locknut

• 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-lb.

• Route the wires inside the cover to prevent pinching. Fasten the cover to the unit using the M3 x 8 flat head screws provided. Refer to the following figure for details.

M3x8

Flat Head Screws

(2 places)

Cover

Assembled

Strain Relief

22 Series N5700 User’s Guide

Connecting the Load

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 23

Connecting the Load

Load Connections for 6V to 60V Models

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

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.

24 Series N5700 User’s Guide

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

Load Connections for 80V to 600V Models

Connecting the Load

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 25

Output Voltage Sensing

• 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. Screws 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 (-)

26 Series N5700 User’s Guide

Output Voltage Sensing

The J2 connector plug specifications are as follows:

NOTE

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.)

If the power supply is operated without the remote sense lines or local sense jumpers, 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.

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.

Power Supply

-V

Load

Remote Sensing

Rem.sense

Local sense

ocal sense

+L +

Rem.sense

Load lines, twisted pair, shortest length possible.

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

To configure the power supply for remote sensing:

Series N5700 User’s Guide 27

Load Considerations

• 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 operating in remote sense 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

-V

Rem.sense

Local sense

ocal sense

Rem.sense

Load#1

Load#2

Load#3

28 Series N5700 User’s Guide

Load Considerations

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 29

Parallel Connections

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. 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.

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 equivalent 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

Local Sensing

Twisted pair

LOAD

30 Series N5700 User’s Guide

+ 98 hidden pages