Agilent Technologies System DC N5700 User Manual

Agilent Technologies

System DC Power Supply

Series N5700

User’s Guide

A

Legal Notices

© Agilent Technologies, Inc. 2004

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

NOTE

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.

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: [phone] 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 Load23
	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 Functions39
	Output On/Off Control 42
	Analog Programming of Output Voltage and Current 44
4	Operating the Power supply Remotely		49
	Configuring the Interface50
	SCPI Commands – an Introduction 59
5	Language Reference	65

Calibration Commands 66

Measure Commands67

Output Commands68

Source Commands69

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 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.

•High-resolution voltage and current front panel controls.

•Accurate voltage and current readback.

•Independent edge-triggered external shut-off, and leveltriggered 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.

System Features

•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

The Agilent N5700 DC Power Supplies – At a Glance

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

Model	Voltage		Current		Model	Voltage		Current
	Range		Range			Range		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

Series N5700 User’s Guide

9

The Front Panel - At a Glance

The Front Panel - At a Glance

1 2 3 4 5 6

		VOLTAGE		DC VOLTS				DC AMPS		CURRENT
			CV							CC
					LIMIT/	OVP	OCP	REM	OUT ON
			PROT	FINE		UVL
	POWER
	19			16	14	13	11	9	7
		18	17	15				12	10	8
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: Press REM to put the unit into local mode. (This button can be
		disabled with a Local Lockout command).
		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: Press OVP/UVL twice to set the under-voltage programming limit
		with the Voltage knob (the display shows UUL). 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
		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

The Rear Panel – At a Glance

The Rear Panel – At a Glance

J2 SW1

ON

+S+LS NC -LC-S 1 2 3 4 5 6 7 8 9 OFF

7 6

		8			9
	10/100 Ethernet		!		!
	LINK	TX
			+V	-V
GPIB	J1
ANALOG PROGRAMMING		NOT ACTIVE			AC INPUT
			80V - 600V		750W
			3	2	1
	5	4
			6V - 60V		1500W

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.
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 for the analog interface. Includes output voltage and current limit
	connector	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

9 – Ground screw

WARNING

Connector for connecting to a GPIB interface. See chapter 4 for setup. M4x8 screws for making chassis ground connections

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

The Rear Panel – At a Glance

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

1 – Output voltage, voltage programming

2 – Output current, voltage programming

3 – Programming range (voltage/resistance)

4 – Voltage and Current monitoring range

5– Shut-Off Logic Select

6– Not Used

7– Output voltage, resistive programming

8– Output current, resistive programming

9– Enable/Disable control

					6	7	8	9
			4	5
1	2	3

The factory-shipped setting is Down for all switches.

Down: The output voltage is programmed by the front panel.

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

Down: The output current is programmed by the front panel.

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

Down: The remote programming range is: 0 – 5V / 0 – 5KΩ. Up: The remote programming range is: 0 – 10V / 0 – 10KΩ.

Down: The remote monitoring range is: 0 – 5V. Up: The remote programming range is: 0 – 10V.

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

Down: The output voltage is programmed by the front panel.

Up: The output voltage is programmed by the external resistor.

Down: The output current is programmed by the front panel.

Up: The output current is programmed by the external resistor.

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

Series N5700 User’s Guide

13

The Rear Panel – At a Glance

J1 Analog Programming Connector

Voltage Monitor									Current Program
Common (-S)									Voltage Program
CV / CC									Local / Analog

13	12	11	10	9	8	7	6	5	4	3	2	1
25	24	23	22	21	20	19	18	17	16	15	14
Parallel
Current Monitor
Current Prog. Return
Voltage Prog. Return
Local / Analog State

Chassis Common

Chassis Common

Enable +

Enable --

Shut Off

Power Supply OK

		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.

SCPI Programming Commands – At a Glance.

		Some [optional] commands have been included for clarity. Chapter 6 contains a
	NOTE
		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 Load23

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

General Information

Models

750 W Models	1500 W Models
N5741A – N5749A	N5761A – N5769A
N5750A – N5752A	N5770A – N5772A

Options

Option Description

Accessories

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

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.

Installing the Unit

Safety Considerations

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

	Do not operate the instrument in the presence of flammable gasses or fumes
WARNING
	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
NOTE
	operation of other instruments. If your equipment is susceptible to magnetic
	fields, do not position it adjacent to the power supply.

Airflow

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

	Ensure that the screws used to attach the rack slide kit do not penetrate more
CAUTION
	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 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.

20	Series N5700 User’s Guide

Connecting the Line Cord

Connecting the Line Cord

	SHOCK HAZARD The power cord provides a chassis ground through a third
WARNING
	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
NOTE
	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

	Connection of this power supply to an AC power source should be made by a
CAUTION
	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.

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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.

L N

M3x8

Flat Head Screws

(2 places)

Cover

Assembled

Strain Relief

22	Series N5700 User’s Guide

		Connecting the Load
Connecting the Load
		SHOCK HAZARD Turn off AC power before making rear panel connections.
	WARNING
		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

Wire Size

		FIRE HAZARD To satisfy safety requirements, select a wire size heavy
WARNING
		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	Resistance	Maximum length in feet to limit voltage to 1 V
		AWG	Ω/1000 foot	for 5 A	for 10 A	for 20A	for 50A	for 150A
		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

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23

Connecting the Load

Cross
section	Resistance	Maximum length in meters to limit voltage to 1 V
(mm2)	Ω/kilometer	for 5 A	for 10 A	for 20A	for 50A	for 150A
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

Load Connections for 6V to 60V Models

	SHOCK HAZARD Hazardous voltages may exist at the outputs and the load
WARNING
	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
CAUTION
	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)

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

Connecting the Load

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

Shield

Load Connections for 80V to 600V Models

	SHOCK HAZARD Hazardous voltages may exist at the outputs and the load
WARNING
	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.

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:	AWG 18 to AWG 10
Stripping Length:	10 mm (0.39 in.)
Torque:	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 -V

Positive Output (+)

Negative (-)

Output/Return

Load wires

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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

A

A

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

Load

wires

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

Output Voltage Sensing

	SHOCK HAZARD There is a potential shock hazard at the sense connector
WARNING
	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:
	Plug Type:	MC 1.5/5-ST-3.81, Phoenix
	Wire Size:	AWG 28 to AWG 16
	Stripping Length:	7 mm (0.28 in.)
	Torque:	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
NOTE
	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.

Local Sensing

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.

		+V
	Power	-V
	Supply

-Rem.sense -Local sense +Local sense +Rem.sense

+

Load

Load lines, twisted pair, shortest length possible.

Remote Sensing

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:

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27

Load Considerations

NOTE

•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.

		+V
	Power	-V
	Supply

-Rem.sense -Local sense +Local sense +Rem.sense

+

Load

Sense lines. Twisted pair or shielded wires.

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.

Load Considerations

Multiple Loads

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.

		+V
	Power	-V
	Supply

-Rem.sense -Local sense +Local sense +Rem.sense

Load lines, twisted pair, shortest length possible.

+ 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.

		+V
	Power	-V
	Supply

-Rem.sense -Local sense +Local sense +Rem.sense

Distribution terminal	+ Load#1
+V
	+ Load#2
-V	+ Load#3

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.

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.

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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.
	SHOCK HAZARD For models up to 60VDC rated output, no point shall be more
WARNING
	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.

Parallel Connections

CAUTION	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.
	-S	-LS +LS	+S	As short as possible
	MASTER		+V
				Twisted
	POWER SUPPLY		-V
				pair
		J1-25
		Parallel		LOAD
		Current Program
	J1-8 J1-12 J1-10
	SLAVE		+V
	POWER SUPPLY		-V
	-S	-LS +LS
			+S

Local Sensing

30	Series N5700 User’s Guide