Agilent Technologies 6641A Operating Manual
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Agilent Technologies 6641A Operating Manual

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OPERATING GUIDE

GPIB DC POWER SUPPLIES
Agilent Technologies Models
664xA, 665xA, 667xA, 668xA, and 669xA

Agilent Part No. 5964-8267
Printed in Malaysia
Microfiche Part No. 5964-8268
September, 2009

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  • Page 1: Operating Guide

    OPERATING GUIDE GPIB DC POWER SUPPLIES Agilent Technologies Models 664xA, 665xA, 667xA, 668xA, and 669xA  Agilent Part No. 5964-8267 Printed in Malaysia Microfiche Part No. 5964-8268 September, 2009...

  • Page 2: Certification

    Export price). If Agilent Technologies is unable, within a reasonable time to repair or replace any product to condition as warranted, the Customer shall be entitled to a refund of the purchase price upon return of the product to Agilent Technologies.

  • Page 3: Safety Summary

    Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the instrument. Return the instrument to an Agilent Technologies Sales and Service Offices for service and repair to ensure that safety features are maintained.

  • Page 4: Printing History

    This document contains proprietary information protected by copyright. All rights are reserved. No part of this document may be photocopied, reproduced, or translated into another language without the prior consent of Agilent Technologies. Information contained in this document is subject to change without notice.

  • Page 5: Declarations

    This DoC applies to above-listed products placed on the EU market after: January 1, 2004 Date Bill Darcy/ Regulations Manager For further information, please contact your local Agilent Technologies sales office, agent or distributor, or β Agilent Technologies Deutschland GmbH, Herrenberger Stra e 130, D71034 Böblingen, Germany Revision: B.00.00...

  • Page 6: Declaration Of Conformity

    This DoC applies to above-listed products placed on the EU market after: January 1, 2004 Date Bill Darcy/ Regulations Manager For further information, please contact your local Agilent Technologies sales office, agent or distributor, or β Agilent Technologies Deutschland GmbH, Herrenberger Stra e 130, D71034 Böblingen, Germany Revision: B.00.00...
  • Page 7 This DoC applies to above-listed products placed on the EU market after: January 1, 2004 Date Bill Darcy/ Regulations Manager For further information, please contact your local Agilent Technologies sales office, agent or distributor, or β Agilent Technologies Deutschland GmbH, Herrenberger Stra e 130, D71034 Böblingen, Germany Revision: B.00.00...

  • Page 8: Table Of Contents

    Table of Contents Certification Safety Summary Printing History Declarations Table of Contents GENERAL INFORMATION Introduction Safety Considerations Instrument Identification Options Accessories Description Front Panel Programming Remote Programming Analog Programming Output Characteristic General Downprogramming Specifications and Supplemental Characteristics INSTALLATION Inspection Damage Packaging Material Items Supplied Location and Temperature...
  • Page 9 Checksum Errors. Runtime Error Messages USER CONNECTIONS Rear Panel Connections (All Models) Load Wire Selection (All Models) Analog Connector (All Models) Digital Connector (All Models) Connecting Series 664xA and 665xA Power Supplies to the Load Output Isolation Load Considerations Local Voltage Sensing Remote Voltage Sensing Connecting One Supply to the Load Connecting Supplies in Auto-Parallel...
  • Page 10 Introduction Equipment Required General Procedure Parameters Calibrated Test Setup Front Panel Calibration Entering the Calibration Values Saving the Calibration Constants Disabling the Calibration Mode Changing the Calibration Password Recovering From Calibration Problems Calibration Error Messages Calibration Over the GPIB Calibration Language Dictionary CAL:CURR CAL:CURR:LEV CAL:CURR:MON (Series 668xA/669xA only)

  • Page 11: General Information

    General Information Introduction Two guides are shipped with your power supply - an Operating Guide (this document) and a Programming Guide. You will find information on the following tasks in these guides: Quick Document Orientation Topic Location Calibrating the power supply Appendix A - this guide Compatibility programming language Appendix B - Programming Guide...

  • Page 12: Safety Considerations

    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 a power source equipped with a 3-wire ground receptacle. Refer to the Safety Summary page at the beginning of this guide for general safety information.

  • Page 13: Accessories

    These units form a family of unipolar, GPIB programmable power supplies organized as follows: Family Power Agilent Models Series 664xA 200 W 6641A, 6642A, 6643A, 6644A, 6645A Series 665xA 500 W 6651A, 6652A, 6653A, 6654A, 6655A Series 667xA 2000 W...

  • Page 14: Front Panel Programming

    Each power supply is programmable locally from the front panel or remotely via a rear-panel analog control port. Operational features include: Constant voltage (CV) or constant current (CC) output over the rated output range. Built-in overvoltage (OV), overcurrent (OC), and overtemperature (OT) protection. Automatic turn-on selftest.

  • Page 15: Output Characteristic

    Specifications and Supplemental Characteristics Tables 1-1 through 1-4 list the specifications and supplemental characteristics for the Series 664xA, 665xA, 667xA, 668xA, and 669xA power supplies. The organization is as follows: Series Specifications Characteristics 6641A-6645A Table l-la Table l-lb 6651A-6655A Table 1-2a Table 1-2b...
  • Page 16 Table 1-1a. Performance Specifications for Series 664xA Parameter Agilent Model Number 6641A 6642A 6643A 6644A 6645A Output Ratings 0 - 8 V 0 - 20 V 0 - 35 V 0 - 60 V 0 - 120 V Voltage: 0 - 20 A...
  • Page 17 Table 1-1b. Supplemental Characteristics for Series 664xA Parameter Agilent Model Number 6641A 6642A 6643A 6644A 6645A Output Programming Range (maximum programmable values) Voltage: 8.190 V 20.475 V 35.831 V 61.425 V 122.85 V 20.475 A 10.237 A 6.142 A 3.583 A 1.535 A...
  • Page 18 Table 1-lb. Supplemental Characteristics for Series 664xA (continued) Parameter Agilent Model Number 6641A 6642A 6643A 6644A 6645A Maximum AC Line Current Ratings 100 Vac nominal: 4.4 A rms 120 Vac nominal: 3.8 A rms 220 Vac nominal: 2.2 A rms 230 Vac nominal: 2.1 A rms...
  • Page 19 Table 1-1b. Supplemental Characteristics for Series 664xA (continued) Parameter All Models Digital Port Characteristics (see Table 1-5) GPIB Interface Capabilities (see Table 1-5) Serial Link Capabilities (see Table 1-5) Recommended Calibration Interval: 1 year Safety Compliance Complies with: CSA 22.2 No.231,IEC 348 Designed to comply with: UL 1244 CISPR-ll, Group 1, Class B...
  • Page 20 Table 1-1b. Supplemental Characteristics for Series 664xA (continued) Parameter All Models Output Impedance Curves (Typical): Notes: For Performance Specifications, see Table l-la. General Information...
  • Page 21 Table 1-2a. Performance Specifications for Series 665xA Parameter Agilent Model Number 6651A 6652A 6653A 6654A 6655A Output Ratings 0 - 8 V 0 - 20 V 0- 35 V 0 - 60 V 0 - 120 V Voltage: 0 - 50 A 0 - 25 A 0 - 15 A 0 - 9 A...
  • Page 22 Table 1-2b. Supplemental Characteristics for Series 665xA Parameter Agilent Model Number 6651A 6652A 6653A 6654A 6655A Output Programming Range (maximum programmable values) Voltage: 8.190 V 20.475 V 35.831 V 61.425 V 122.85 V Current: 51.188 A 25.594 A 15.356 A 9.214 A 4.095 A Overvoltage Protection (OVP):...
  • Page 23 Table 1-2b. Supplemental Characteristics for Series 665xA (continued) Parameter Agilent Model Number 6651A 6652A 6653A 6654A 6655A Maximum AC Line Current Ratings 100 Vac nominal: 12 A rms (15 AM fuse) 120 Vac nominal: 10 A rms (12 AM fuse) 220 Vac nominal: 5.7 A rms (7 AM fuse) 230 Vac nominal:...
  • Page 24 Table 1-2b. Supplemental Characteristics for Series 665xA (continued) Parameter All Models Digital Port Characteristics (see Table 1-5) GPIB Interface Capabilities (see Table 1-5) Serial Link Capabilities (see Table 1-5) Recommended Calibration Interval: 1 year Safety Compliance Complies with: CSA 22.2 No.231,IEC 348 Designed to comply with: UL 1244 CISPR-ll, Group 1, Class B...
  • Page 25 Table 1-2b. Supplemental Characteristics for Series 665xA (continued) Parameter All Models Output Impedance Curves (Typical): Notes: For Performance Specifications, see Table l-2a. General Information 25...
  • Page 26 Table 1-3a. Performance Specifications for Series 667xA Parameter Agilent Model Number 6671A 6672A 6673A 6674A 6675A Output Ratings Voltage: 0 - 8 V 0 - 20 V 0- 35 V 0 - 60 V 0 - 120 V Current:@ 0 to 55° ° ° ° C 0 - 220 A 0 - 100 A 0 - 60 A...
  • Page 27 Table 1-3b. Supplemental Characteristics for Series 667xA Parameter Agilent Model Number 6671A 6672A 6673A 6674A 6675A Output Programming Range (maximum programmable values) Voltage: 8.190 V 20.475 V 35.831 V 61.425 V 122.85 V Current: 225.23 A 102.37 A 61.43 A 35.83 A 18.43 A Overvoltage Protection (OVP):...
  • Page 28 Table 1-3b. Supplemental Characteristics for Series 667xA (continued) Parameter Agilent Model Number 6671A 6672A 6673A 6674A 6675A Remote Sensing Capability Voltage Drop Per Lead: Up to 1/2 of rated output voltage. Load Voltage: Subtract voltage drop in load leads from specified output voltage rating.
  • Page 29 Table 1-3b. Supplemental Characteristics for Series 667xA (continued) Parameter All Models Digital Port Characteristics (see Table 1-5) GPIB Interface Capabilities (see Table 1-5) Serial Link Capabilities (see Table 1-5) Recommended Calibration Interval: 1 year Safety Compliance Complies with: CSA 22.2 No.231,IEC 348 Designed to comply with: UL 1244 CISPR-ll, Group 1, Class B...
  • Page 30 Table 1-3b. Supplemental Characteristics for Series 667xA (continued) Parameter All Models Output Impedance Curves (Typical): Notes: For Performance Specifications, see Table l-3a. General Information...
  • Page 31 Table 1-4a. Performance Specifications for Series 668xA Parameter Agilent Model Number 6680A 6681A 6682A 6683A 6684A Output Ratings Voltage: 0 - 5 V 0 - 8 V 0- 21 V 0 - 32 V 0 - 40 V Current:* 0 - 875 A 0 - 580 A 0 - 240 A 0 - 160 A...
  • Page 32 Table 1-4b. Supplemental Characteristics for Series 668xA Parameter Agilent Model Number 6680A 6681A 6682A 6683A 6684A Ripple & Noise (from 20 Hz to 20 MHz with outputs ungrounded, or with either output terminal grounded) Constant Current:** 290 mA 190 mA 40 mA 28 mA 23 mA...
  • Page 33 Table 1-4b. Supplemental Characteristics for Series 668xA (continued) Parameter Agilent Model Number 6680A 6681A 6682A 6683A 6684A Remote Sensing Capability Voltage Drop Per Lead: Up to 1/2 of rated output voltage. Load Voltage: Subtract voltage drop in load leads from specified output voltage rating.
  • Page 34 Table 1-4b. Supplemental Characteristics for Series 668xA (continued) Parameter All Models Command Processing Time (Average time for output voltage to change after receipt of digital data when the supply is connected directly to the GPIB Bus): 20 ms Monotonicity: Output is monotonic over entire rated voltage, current, and temperature range.
  • Page 35 Table 1-4b. Supplemental Characteristics for Series 668xA (continued) Parameter All Models Output Impedance Curves (Typical): CV MODE CV MODE CC MODE CC MODE 1.25 1.25 0.625 0.625 0.312 0.312 0.156 0.156 0.078 0.078 0.039 0.039 0.0195 0.195 FREQUENCY (HZ) FREQUENCY (HZ) Agilent 6681A Agilent 6680A CV MODE...
  • Page 36 Table 1-5a. Performance Specifications for Series 669xA Parameter Agilent Model Number 6690A 6691A 6692A Output Ratings Voltage: 0 - 15 V 0 - 30 V 0- 60 V Current:* 0 - 440 A 0 - 220 A 0 – 110 A *Derated linearly 1%/°C from 40 °...
  • Page 37 Table 1-5b. Supplemental Characteristics for Series 669xA Parameter Agilent Model Number 6690A 6691A 6692A Ripple & Noise (from 20 Hz to 20 MHz with outputs ungrounded, or with either output terminal grounded) Constant Current:** 200 mA 50 mA 30 mA **With load inductance >...
  • Page 38 Table 1-5b. Supplemental Characteristics for Series 669xA (continued) Parameter Agilent Model Number 6690A 6691A 6692A Remote Sensing Capability Voltage Drop Per Lead: Up to 1/2 of rated output voltage. Load Voltage: Subtract voltage drop in load leads from specified output voltage rating.
  • Page 39 Table 1-5b. Supplemental Characteristics for Series 669xA (continued) Parameter All Models Command Processing Time (Average time for output voltage to change after receipt of digital data when the supply is connected directly to the GPIB Bus): 20 ms Monotonicity: Output is monotonic over entire rated voltage, current, and temperature range.
  • Page 40 Table 1-5b. Supplemental Characteristics for Series 669xA (continued) Parameter All Models Output Impedance Curves (Typical): CC mode CV mode Agilent 6690A 1000 0.01 1000 10000 100000 Frequency (in Hz) CC mode CV mode Agilent 6691A 1000 0.01 1000 10000 100000 Frequency (in Hz) CC mode CV mode...
  • Page 41 Table 1-6. Supplemental GPIB Characteristics for All Models Parameter All Models Digital Port Characteristics 16.5Vdc between terminals 1&2; 3&4; and from 1 or 2 to chassis Maximum ratings: ground FLT/INH Operation FLT/INH Terminals 1 & 2: (low-level output current) 1.25 mA maximum (low-level output voltage) 0.5 V maximum FLT/INH Terminals 3 &...
  • Page 42 Table 1-7. Operator Replaceable Parts List (continued) Description Agilent Part No. (Unless otherwise specified, parts apply to all models.) Fuses, Series 664xA M6A 250V (for 100 Vac line voltage, reference designator F450) 2110-0056 M5A 250V (for 120 Vac line voltage, reference designator F450) 2110-0010 M3A 250V (for 220/230/240 Vac line voltage, reference designator F450) 2110-0003...

  • Page 43: Installation

    Until you have checked out the power supply save the shipping carton and packing materials in case the power supply has to be returned to Agilent Technologies. If you return the power supply for service, attach a tag identifying the model number and the owner.

  • Page 44: Location And Temperature

    Table 2-1. Items Supplied (continued) Output Series 667xA only hardware Output hardware (screws with nuts and lockwashers) for securing your load wires to the output bus bars (see Table 1-6). Guide change If applicable, change sheets may be included with this guide. If there are change sheets, make the page indicated corrections in this guide.

  • Page 45: Input Power Source

    Input Power Source Refer to the applicable paragraphs below for information on the input power source. Do not apply power to the power supply until directed to do so in Chapter 3. Check the line label on the rear of your supply and verify that the voltage shown there RATING corresponds to the nominal line voltage of your power source.
  • Page 46 The power cord supplied with power supply may or may not include a power plug (see "Options" in Chapter l) at one end of the cord. Terminating connections and a ground lug are attached to the other end of the cord. See Figure 2-2 and proceed as follows: 1.

  • Page 47: Installing The Series 668Xa Power Cord

    (see "AC Input Ratings" in Table 1-4a). In order to maintain phase current balancing, the power source should be a dedicated line with only Agilent Technologies Series 668xA/669xA supplies drawing current from it. A disconnect box located near the power supply (see Figure 2-4) is recommended for all installations and is mandatory for direct-wired installations.

  • Page 48: Installing The Series 669Xa Power Cord

    (see "AC Input Ratings" in Table 1-4a). In order to maintain phase current balancing, the power source should be a dedicated line with only Agilent Technologies Series 668xA/669xA supplies drawing current from it. A disconnect box located near the power supply (see Figure 2-4) is recommended for all power cords with plugs and is mandatory for hard-wired power installations.
  • Page 49 3. Tighten the screws securing the clamp . Torque the screws using 2 to 4 inch-pounds (0.23 to 0.45 Newton meters). 4. Insert the power cord with the cable clamp into one of the two openings on the safety cover. (The figure shows the power cord installed in the bottom opening.) Tighten the lock nut and the cable clamp to the safety cover.

  • Page 51: Turn-On Checkout

    Turn-On Checkout Note This chapter provides a preliminary introduction to the power supply front panel. See "Chapter 5 - Front Panel" for more details. Introduction Successful tests in this chapter provide a high degree of confidence that the power supply is operating properly. For verification tests, see “Appendix B - Operation Verification”.

  • Page 52: Power-On Checkout (All Models)

    Power-On Checkout (All Models) 1. Connect the power cord to the power source (for Series 668xA & 669xA, turn on the safety disconnect switch). 2. Turn the front panel power switch to ON (1). 3. The power supply undergoes a self-test when you turn it on. If the test is normal, the following sequence appears on the LCD: a.

  • Page 53: Checking The Voltage Function

    Checking the Voltage Function The tests in Table 3-1 check the basic voltage functions with no load connected to the power supply. The VOLTS display will show various readings. Ignore the AMPS display. Table 3-1. Checking the Voltage Functions (Output Terminals Open) Procedure Display Explanation...

  • Page 54: Checking The Current Function

    Checking the Current Function ENERGY HAZARD. Some supplies (Series 668xA/669xA) can provide more than 240 VA at more than 2 V. If the output connections touch, severe arcing may occur resulting in burns, ignition or welding of parts. Do not attempt to make connections while the output is live. The tests in Table 3-2 check the basic current functions with a short connected across the power supply output.

  • Page 55: Checking The Save And Recall Functions (All Models)

    Table 3-2. Checking the Current Functions (Output Terminals Shorted) (continued) Action Display Explanation Press AMPS 0.000 Dis annunciator turns on. Press You have disabled the overcurrent protection circuit. The OCP annunciator turns off. Press You have cleared the overcurrent protection circuit. The Prot annunciator turns off.

  • Page 56: Series 664Xa And 665Xa Supplies

    Series 669xA supplies, if the Red indicator appears in the fuse window on the rear panel, then one or more of the line fuses are open. If the supply has a defective fuse, replace it only once. If it fails again, investigate the reason for the failure. Proceed as follows: Series 664xA and 665xA Supplies The line fuse is located on the rear panel (3, Figure 2-l).

  • Page 57: Series 668Xa Supplies

    Series 668xA Supplies The line fuses are located on the rear panel (see Figure 2-5). Proceed as follows: l. Turn off the front panel power switch and remove the input power (unplug the power cord or open the safety disconnect). 2.

  • Page 58: Checksum Errors

    Table 3-3. Power-On Selftest Errors Error Display Failed Test Error Display Failed Test FP RAM Front Panel RAM SEC RAM Secondary RAM FP ROM Front Panel ROM checksum SEC ROM Secondary ROM checksum EE CHKSUM EEPROM SEC 5V Secondary 5 V ADC reading Primary external RAM Secondary ambient PRI XRAM...

  • Page 59: User Connections

    User Connections Rear Panel Connections (All Models) Make application load connections to the output terminals or bus bars, analog connector, and digital connector as shown on the rear-panel drawing for your model power supply. These connections are organized by series as follows: Series 664xA and 665xA Series 667xA Series 668xA and 669xA...

  • Page 60: Analog Connector (All Models)

    Analog Connector (All Models) This connector, which is on the rear panel, is for connecting remote sense leads, external current monitors, and external programming sources. The connector accepts wires sizes from AWG 22 to AWG 12. Insert Wires Tighten Screws Agilent Series 664xA &...

  • Page 61: Connecting Series 664Xa And 665Xa Power Supplies To The Load

    If you need help in solving a stability problem, contact an Agilent service engineer through your local Sales and Support Office (see end of this guide). Series 664xA/665xA Power Supplies, Maximum External Capacitance (µ µ µ µ F) 6641A 6642A 6643A...

  • Page 62: Local Voltage Sensing

    Series 664xA/665xA Power Supplies, Maximum OVP External Capacitance (µ µ µ µ F) 6641A 6642A 6643A 6644A 6645A 6651A 6652A 6653A 6654A 6655A 700,000 35,000 15,000 7,000 3,000 1.6 (F) 100,000 50,000 18,000 8,000 If a load capacitance approaches the specified limit, it is recommended that you do not make it a normal practice of tripping the OVP circuit and discharging the load capacitance through that circuit.

  • Page 63: Remote Voltage Sensing

    Note If the sense terminals are left unconnected, the voltage at the bus bars will increase approximately 3 to 5% over the programmed value. Since it is measured at the sense terminals, the voltage readback will not reflect this increased output. Remote Voltage Sensing The dashed lines in the wiring diagrams illustrate remote voltage sensing.

  • Page 64: Connecting One Supply To The Load

    Stability Using remote sensing under unusual combinations of load-lead lengths and large load capacitances may cause your application to form a low-pass filter that becomes part of the voltage feedback loop. The extra phase shift created by this filter can degrade the supply's stability and result in poor transient response. In severe cases, this may cause output oscillations.

  • Page 65: Connecting Supplies In Auto-Parallel

    Load Connection Loads Analog Connector A Set switch for local or (optional) remote sensing B Connect for remote sensing (optional) Figure 4-3c. Series 664xA and 665xA Multiple Load Connection (Remote Sensing Optional) Connecting Supplies in Auto-Parallel Auto-Parallel Wiring. Figure 4-3d illustrates how power supplies can be connected in auto-parallel for increased current output.
  • Page 66 Auto-Parallel Programming. Program only the output current of the first ("master") supply in the series; the "slave" supplies automatically track the master's output. Program the output current of the slave supplies to zero. However, the voltage and OVP settings of the slave supplies must be set higher than the operating voltage of the master supply. This ensures that the slave supplies will operate in CC mode.

  • Page 67: Connecting Supplies In Series

    Connecting Supplies in Series Floating voltages must not exceed ±240 Vdc. No output terminal may be more than 240 V from chassis ground. Figure 4-3f shows how power supplies can be connected in series for higher voltage output. Series connections are straightforward in this case. Program each power supply independently. If two supplies are used in the series configuration, program each supply for 50% of the total output voltage.

  • Page 68: Connecting Series 667Xa Power Supplies To The Load

    Analog connector l=Voltage programming source 0 to --5 V 2=Current programming source 0 to --5 V Figure 4-3g. Series 664xA and 665xA Analog Programming Connections If you cannot avoid capacitive coupling, it may help to place capacitors from the unused programming inputs to ground. Especially with auto-parallel operation, connecting a capacitor (≥4,000 pF) from VP to P Common on the master supply will ensure proper operation.

  • Page 69: Load Considerations

    Output Safety Cover Analog Connector -Output Bus Bar -Local Sense Terminal + Local Sense Terminal + Output Bus Bar Signal Common Local Sense Jumpers Rear Knockouts Bottom Knockout A Insert screwdriver blade in slot and pry out B Bend along joint and break off WARNING DO NOT LEAVE UNCOVERED HOLES IN OUTPUT COVER.

  • Page 70: Local Voltage Sensing

    where: C = model-dependent internal capacitance (see below); L = inductance of the load; Rext = equivalent series resistance of the load; R = model-dependent internal resistance (see below): 6671A 6672A 6673A 6674A 6675A 44,000 µ F 44,000 µ F 12,000 µ...
  • Page 71 Connecting the Sense Leads You must connect the positive side of the load to the +S analog connector pin and the negative side of the load to the -S analog connector pin (see Figure 4-1). Connect the sense leads carefully so that they do not become open-circuited. If sense leads are left open during operation, the supply will regulate at the output terminals instead of at the load.

  • Page 72: Connecting One Power Supply To A Single Load

    Load Leads Remote Sense Points Cl, C2 = 33 µ F C3 = Load bypass capacitor R1, R2 = 20 Ω , 1% Figure 4-4b. Series 667xA Sense Lead Bypass Network Connecting One Power Supply to a Single Load Figure 4-4c shows how to connect a single power supply to one load. Keep output load leads close together (small loop area) to obtain a low inductance and low impedance connection to the load.

  • Page 73: Connecting Supplies In Auto-Parallel

    Loads Load Connection Analog Connector A Connect for remote sensing (optional) B Connect for local sensing (default) Figure 4-4d. Series 667xA Multiple Load Connection (Remote Sensing Optional) Connecting Supplies in Auto-Parallel Auto-Parallel Wiring (Figure 4-4e). Figure 4-4e illustrates how power supplies can be connected in auto-parallel for increased current output.

  • Page 74: Connecting Supplies In Series

    Auto-Parallel Programming. Program only the output current of the first ("master") supply in the series; the "slave" supplies automatically track the master's output. Program the output current of the slave supplies to zero. However, the voltage and OVP settings of the slave supplies must be set higher than the operating voltage of the master supply. This ensures that the slave supplies will operate in CC mode.

  • Page 75: External Voltage Control

    External Voltage Control The setup shown in Figure 4-4g allows an external dc voltage to program the power supply output. A voltage applied to the voltage programming input programs the output voltage and a voltage applied to the current programming input programs the output current.

  • Page 76: Connecting Series 668Xa And 669Xa Power Supplies To The Load

    Connecting Series 668xA and 669xA Power Supplies to the Load ENERGY HAZARD. These power supplies can provide more than 240 VA at more than 2 V. If the output connections touch, severe arcing may occur resulting in burns, ignition or welding of parts. Do not attempt to make connections to live output circuits.

  • Page 77: Local Voltage Sensing

    Inductive Loads Inductive loads present no loop stability problems in CV mode. In CC mode, inductive loads will form a parallel resonance with the power supply's output capacitor, possibly causing current ringing in the load. For a given inductance, the power supply's CC control loop can be made to stabilize the current.
  • Page 78 OVP Considerations The power supply OVP circuit senses voltage near the output bus bars, not at the load. Therefore the signal sensed by the OVP circuit can be significantly higher than the actual voltage at the load. When using remote sensing, you must program the OVP trip voltage high enough to compensate for the voltage drop between the output bus bars and the load.

  • Page 79: Connecting One Power Supply To A Single Load

    Connecting One Power Supply to a Single Load Figure 4-5c shows how to connect a single power supply to one load. Keep output load leads close together (small loop area) to obtain a low inductance and low impedance connection to the load. If you wish to use remote sensing, connect the sense leads at the load as shown in the figures.

  • Page 80: Connecting Supplies In Auto-Parallel

    Connecting Supplies in Auto-Parallel Note Refer to Appendix F for more information about auto-parallel operation. Auto-Parallel Wiring (Figure 4-5e). Figure 4-5e shows how power supplies can be auto-paralleled for increased current output. Up to three supplies can be connected for auto-parallel operation. Use heavy enough load leads so that the absolute voltage difference between the ⊕...

  • Page 81: Connecting Supplies In Series

    Connecting Supplies in Series Floating voltages must not exceed ± 60 Vdc. No output terminal may be more than 60 V from chassis ground. Figure 4-5f illustrates how power supplies can be connected in series for increased voltage capability. Series connections are straightforward in this case.

  • Page 82: External Voltage Control

    External Voltage Control The setup shown in Figure 4-5g allows an external dc voltage to program the power supply output. A zero-to-full scale voltage applied to the voltage programming input produces a proportional zero-to-full scale output voltage. The voltage programming source is referenced to the programming Common P ( ↓ P) terminal. A zero-to-full scale voltage applied to one of the current programming inputs produces a proportional zero-to-full scale output current.

  • Page 83: Controller Connections

    Controller Connections Figure 4-6 shows two basic ways of connecting your power supply to a controller. They are "linked" and "stand-alone configurations. Stand-Alone Connections See Figure 4-6A. Each stand-alone power supply has its own GPIB bus address. Stand-alone power supplies may be connected to the bus in series configuration, star configuration, or a combination of the two.
  • Page 84 From 1 to 16 direct supplies may be connected to 1 controller GPIB interface. Tighten connector thumbscrews by hand. Do not use a screwdriver. Do not stack more than 3 connectors on a GPIB receptacle. GPIB cable (see Accessories in Chapter 1) From 1 to 15 linked supplies may be connected to 1 direct supply.

  • Page 85: Front Panel Operation

    Front Panel Operation Introduction This chapter shows you how to operate the front panel. It is assumed that you are familiar with the turn-on checkout procedure in Chapter 3. That chapter describes how to perform basic power supply functions from the control panel. operations that you can perform are: Enabling or disabling the power supply output.
  • Page 86 6681A 0-8V/0-580A SYSTEM DC POWER SUPPLY SYSTE M FUNCTION ENTRY AMPS VOLTS Local Output Voltage on/off Voltage Error Prot Clear VCal ICal OVCal Address Protect Current Voltage Dis OCP Prot Shift Rmt Addr SRQ Save Cal Enable Cal Disable Pass Recall Enter VOLTAGE...
  • Page 87 Table 5-1. Front Panel Controls and Indicators (continued) Output Rotary Controls Voltage Rotate clockwise to increase output voltage or program setting. Use to rapidly set an approximate output value (see keys). Current Rotate clockwise to increase output current or program setting. Use to rapidly set an approximate current value (see keys).

  • Page 88: Programming The Output

    Table 5-1. Front Panel Controls and Indicators (continued) ENTRY Keys (continued) Press to select numerical values . thru Press to enter a minus sign. Press to delete the last keypad entry. Use this key to remove one or more incorrect digits before they are entered.

  • Page 89: Programming Voltage

    Figure 5-2. Typical Power Supply Operating Curve Programming Voltage To program the output for 4.5 volts, proceed as follows: Press . The display will change from meter mode to indicate VOLTS . Press . If you discover a mistake before pressing , erase the incorrect value with the backspace The display will return to the meter mode and indicate 0.000 volts.

  • Page 90: Programming Current

    Checking OVP Operation Assuming the above operating conditions (voltage programmed to 4.5 V and OVP programmed to 4.8 V), trip the OVP circuit as follows: Gradually increase the output voltage by pressing until the OVP circuit trips. This will cause the output voltage to drop to zero and the Prot annunciator to go on.

  • Page 91: Programming Overcurrent Protection

    Programming Overcurrent Protection When enabled, overcurrent protection removes the power supply output whenever it goes into CC operation. This prevents the supply from indefinitely supplying the full programmed current to the load. Setting The OCP Protection To activate overcurrent protection, press .

  • Page 92: Unregulated Operation

    Unregulated Operation If the power supply goes into a mode of operation that is neither CV nor CC, the Unr annunciator will light. An unregulated condition limits the output current to a value that is safe for the power supply. Some unregulated states occur so briefly that they do not turn on the Unr annunciator, but they may set the UNR status bit during remote operation (see the power supply “Programming Guide”).

  • Page 93: Setting The Gpib Address

    Whenever you wish, you can return the power supply to the original factory reset state. To do this, simply hold down the key when you turn on the supply. The display indicates RST POWER-ON to verify that the power supply has configured its turn-on state to the original reset state.

  • Page 95: Calibration

    Recommended Model Voltmeter D-c accuracy 0.005%, 6 digits Agilent 3456A or 3458A Shunt resistor Agilent 6641A, 51A, 52A Guildline 9230/100 100 A, 0.01 Ω, 0.04%, 100 W Agilent 6642A, 43A, 44A, 45A, Guildline 9230/15 15 A, 0.1 Ω, 0.04%, 25 W...

  • Page 96: Front Panel Calibration

    • Overvoltage protection (OVP). • Output current. • Output current readback. • Current monitor input I (Series 668xA/669xA only). You do not have to do a complete calibration each time. If appropriate, you may calibrate only the voltage or current and proceed to "Saving the Calibration Constants".
  • Page 97 c) Series 668xA/669xA Setup Figure A-1. Calibration Test Setup Calibration 97...
  • Page 98 Table A-2. Typical Front Panel Calibration Procedure Action Display Response Enabling the Calibration Mode 1. Begin calibration by pressing PASWD 2. Enter calibration password from Entry keypad. If password is correct the Cal annunciator will come on. PASSWD ERROR If password is incorrect, an error occurs Note: The initial (factory-default) password is the model number of the power supply, but it can be changed (see "Changing the Password"...

  • Page 99: Recovering From Calibration Problems

    Table A-2. Typical Front Panel Calibration Procedure (continued) Action Display Response Calibrating Current Monitor (I ) (Series 668xA/669xA Only) If you perform this calibration, then you must recalibrate the current output. 1. Make certain the appropriate shunt resistor (see Table A-1) is the only load on the power (Meter mode) supply.

  • Page 100: Cal:curr

    Calibration Over the GPIB You can calibrate the power supply by using SCPI commands within your controller programming statements. Be sure you are familiar with calibration from the front panel before you calibrate from a controller. The SCPI calibration commands are related to the front panel calibration controls as follows: Front Panel Corresponding SCPI...

  • Page 101: Cal:curr:mon (Series 668Xa/669Xa Only)

    CAL:CURR:MON (Series 668xA/669xA only) This command sets the power supply to the current monitor (I ) calibration point that is then entered with CAL:CURR[:DATA]. The output current must be calibrated after CAL:CURR:MON is performed. Command Syntax CALibrate:CURRent:MONitor Parameters <NRf+> Examples CAL: CURR: MON CALibrate: CURRent: MONitor Query Syntax...

  • Page 102: Cal:volt

    CAL:VOLT This command is used to calibrate the output voltage. The command enters voltage value that you obtain from an external meter. (If you are entering the voltage value, allow time for the DVM to stabilize.) You must first select a calibration level (CAL:VOLT:LEV) for the value being entered.
  • Page 103 ! Agilent BASIC Calibration Program DIM Resp$ [255],Err_msg$[255] 50 Volt_cal: ! Voltage DAC calibration Err_found=0 PRINT TABXY(5,10),"CONNECT INSTRUMENTS AS SHOWN IN FIG. A-1(1). Then Press Continue" PAUSE CLEAR SCREEN ! Assign power supply GPIB address ASSIGN @Ps TO 705 ! Initialize power supply OUTPUT @Ps;"*RST;OUTPUT ON"...
  • Page 104 Password is optional - only required if set to non-zero value Default password is four-digit model number ! LINE 590 PASSWORD MUST BE EDITED FOR MODEL OTHER THAN 6680 OUTPUT @Ps;"CAL:STATE ON, 6680" OUTPUT @Ps;"VOLT:LEV 2" ! Refer to Table A-1 for correct shunt value for model being calibrated INPUT "ENTER VALUE 0F CURRENT SHUNT BEING USED",Shunt_val STEPS 640 THROUGH 670 NOT USED ON 664x, 665x and 667x OUTPUT @Ps;"CAL:CURRENT:MONITOR"...

  • Page 105: Operation Verification

    Agilent 3458A Readout: 8 1/2 digits Accuracy: 20 ppm Current Monitor Resistor Agilent 6641A, 51A, 52A 100 A, 0.01 Ω , 0.04%, 100 W Guildline 9230/100 Agilent 6642A, 43A, 44A, 45A, 53A, 54A, 55A 15 A, 0.1 Ω , 0.04%, 25 W...
  • Page 106 c) Series 668xA/669xA Setup Figure B-1. Verification Test Setup Operation Verification...

  • Page 107: Order Of Tests

    Performing the Tests General Measurement Techniques Figure B-1 shows the setup for the tests. Be certain to use load leads of sufficient wire gauge to carry the output current (see Table 4-1). To avoid noise pickup, use coaxial cable or shielded pairs for the test leads. Programming the Power Supply Table 1-lb, Table 1-2b, Table 1-3b and Table 1-4b in Chapter 1 list the programming voltage and current ranges for each model.

  • Page 108: Current Programming And Readback Accuracy

    Current Programming and Readback Accuracy This test verifies that the current programming and readback are within specification. Connect the appropriate current monitoring resistor (see Table B-1) as shown in Figure B-1(2). The accuracy of the resistor must be as specified in the table. Table B-3.
  • Page 109 Table B-4. Operation Verification Test Parameters for Series 664xA Test Description Minimum Spec Results * Maximum Measurement Spec Uncertainty MODEL Agilent 6641A Voltage Programming and Readback Low Voltage (0 V) V -5 mV ____________ mV + 5 mV 2.0 µ V Front Panel Display Readback Vout -6.0 mV...
  • Page 110 Table B-4. Operation Verification Test Parameters for Series 664xA (continued) Test Description Minimum Spec Results * Maximum Measurement Spec Uncertainty MODEL Agilent 6645A Voltage Programming and Readback Low Voltage (0 V) V -51 mV ____________ mV + 51 mV 2.0 µ V Front Panel Display Readback Vout -80 mV ____________ mV...
  • Page 111 Table B-5. Operation Verification Test Parameters for Series 665xA Test Description Minimum Spec Results * Maximum Measurement Spec Uncertainty MODEL Agilent 6651A Voltage Programming and Readback Low Voltage (0 V) V -5 mV ____________ mV + 5 mV 2.0 µ V Front Panel Display Readback Vout -6.0 mV ____________ mV...
  • Page 112 Table B-5. Operation Verification Test Parameters for Series 665xA (continued) Test Description Minimum Spec Results * Maximum Measurement Spec Uncertainty MODEL Agilent 6655A Voltage Programming and Readback Low Voltage (0 V) V -51 mV ____________ mV + 51 mV 2.0 µ V Front Panel Display Readback Vout -80 mV ____________ mV...
  • Page 113 Table B-6. Operation Verification Test Parameters for Series 667xA Test Description Minimum Spec Results * Maximum Measurement Spec Uncertainty MODEL Agilent 6671A Voltage Programming and Readback Low Voltage (0 V) V -8 mV ____________ mV + 8 mV 1.6 µ V Front Panel Display Readback Vout -12 mV ____________ mV...
  • Page 114 Table B-6. Operation Verification Test Parameters for Series 667xA (continued) Test Description Minimum Spec Results * Maximum Measurement Spec Uncertainty MODEL Agilent 6675A Voltage Programming and Readback Low Voltage (0 V) V -120 mV ____________ mV + 120 mV 3.0 µ V Front Panel Display Readback Vout -180 mV ____________ mV...
  • Page 115 Table B-7. Operation Verification Test Parameters for Series 668xA Test Description Minimum Spec Results * Maximum Measurement Spec Uncertainty MODEL Agilent 6680A Voltage Programming and Readback Low Voltage (0 V) V -0.005 V ____________ V + 0.005 V 1.0 µ V Front Panel Display Readback Vout -7.5 mV ____________ mV...
  • Page 116 Table B-7. Operation Verification Test Parameters for Series 668xA (continued) Test Description Minimum Spec Results * Maximum Measurement Spec Uncertainty MODEL Agilent 6684A Voltage Programming and Readback Low Voltage (0 V) V -40 mV ____________ mV + 40 mV 2.0 µ V Front Panel Display Readback Vout -60 mV ____________ mV...
  • Page 117 Table B-8. Operation Verification Test Parameters for Series 669xA Test Description Minimum Spec Results * Maximum Measurement Spec Uncertainty MODEL Agilent 6690A Voltage Programming and Readback Low Voltage (0 V) V -0.015 V ____________ V + 0.015 V 1.0 µ V Front Panel Display Readback Vout -22.5 mV ____________ mV...

  • Page 119: Line Voltage Conversion

    Line Voltage Conversion Series 664xA and 665xA Power Supplies SHOCK HAZARD. Hazardous voltage can remain inside the power supply even after it has been turned off. This procedure should only be done by qualified electronics service personnel. Line voltage conversion is accomplished by: Series 664xA - setting line voltage select switches.

  • Page 120: Series 667Xa Power Supplies

    Figure C-2. Series 665xA Line Select Jumpers Series 667xA Power Supplies SHOCK HAZARD. Hazardous voltage can remain inside the power supply even after it has been turned off. This procedure should only be done by qualified electronics service personnel. Line voltage conversion is accomplished by setting a line voltage select switch. Proceed as follows: 1.

  • Page 121: Series 668Xa/669Xa Power Supplies

    Series 668xA/669xA Power Supplies Line voltage conversion kits are available for changing the input line voltage on series 668xA/669xA power supplies. Part numbers are listed under “Accessories” in chapter 1. Each line voltage conversion kit contains the following parts which are required to complete the line voltage conversion: Input fuses rated for the converted line voltage.
  • Page 122 Figure C-4. Removing the Series 668xA/669xA Inner Cover Figure C-5. Series 668xA/669xA Line Conversion Jumpers 122 Line Voltage Conversion...

  • Page 123: Digital Port Functions

    Digital Port Functions Digital Connector A 4-pin connector and a quick-disconnect mating plug are provided for digital input and output signals (see Figure D-l for wiring connections, and Table 1-5 in Chapter 1 for electrical characteristics). This digital port can be configured to provide either Fault/Inhibit or Digital I/O functions.
  • Page 124 In Figure D-2, the INH input is connected to a switch that shorts pin 3 to pin 4 whenever it is necessary to externally disable the output of the supply. This will activate the remote inhibit (RI) fault protection circuit, causing the front panel Prot annunciator to come on.
  • Page 125 GPIB GPIB GPIB Figure D-3. Examples of FLT Outputs Figure D-4. Digital Port Configuration Jumper Digital Port Functions 125...

  • Page 126: Changing The Port Configuration

    Changing the Port Configuration As shipped from the factory, the digital port is configured for FLT/INH operation. You can change the configuration of the port to operate as a general-purpose digital input/output port to control your custom circuitry as shown in Figure D-4. To change the port configuration, you must move a jumper on the GPIB board.

  • Page 127: Relay Link Operation

    Relay Link Operation Relay link operation cannot be used with units that output more than 50 amps. (Some 667xA series units; all 668xA and 669xA series units.) The digital port can be configured to provide relay control outputs for the Agilent 59510A or 59511A Relay Accessory. Refer to Figure D-1 for the pin assignments of the mating plug.

  • Page 129: Current Loop Compensation (Series 668Xa Only)

    Current Loop Compensation (Series 668xA Only) Introduction This section describes how you may use current loop compensation to optimize for inductive loads or for fast CV/CC mode crossover. A 7-position compensation switch for this purpose is located under the cover on the rear of the power supply. Function of Loop Compensation Figure E-1 shows the switch settings for specific combinations of load inductance and resistance.
  • Page 130 For example, examine Figure E-l for the Model 6680A/6681A. The chart shows that a load comprised of about 1 millihenry inductance and 100 micro ohms resistance (see point ) requires switch setting 9 (only switch 3 closed) to obtain 10% overshoot. If the load resistance is increased to 1 milliohm, then the operating position will be to the left of the existing compensation curve (see point ).
  • Page 131 Figure E-1. CC Loop Compensation Curves For Models 6682A and 6683A Current Loop Compensation (Series 668xA Only) 131...

  • Page 132: Setting The Loop Compensation Switch

    Figure E-1. CC Loop Compensation Curves For Model 6684A Setting the Loop Compensation Switch SHOCK/ENERGY HAZARD. This procedure involves removing the outside cover and should only be done by qualified electronics service personnel. 1. Turn off the power switch and disconnect the power cord from the power source. If this is not possible, remove the three line fuses from the rear panel (see Figure 2-4).

  • Page 133: Using Agilent 668Xa/669Xa Series Power Supplies In Autoparallel

    Using Agilent 668xA/669xA Series Power Supplies in Autoparallel Introduction This information is supplementary to the information in chapter 4. A maximum of three Agilent 668xA/669xA series power supplies having the same model number, may be configured for autoparallel operation. The Agilent 668xA/669xA power supplies were designed with an external programming offset so that the master unit will output current before the slave units do.
  • Page 134 Example: 1 master unit, 2 slave units, Agilent Models 6680A (5V, 875A) Iout = Im ( 3.0508 ) - 44.4A The master current limit must be set above 44.4A /3.0508 = 14.55A to obtain any output current. For a no-load condition: Master current =14.55A Each slave current = -14.55A /2 = -7.28A Iout = 0A...

  • Page 135: Output Bus Bar Options

    Output Bus Bar Options Option 602 Installation WARNING ENERGY HAZARD. The Series 668xA/669xA power supplies can provide more than 240 VA at more than 2 V. If the output connections touch, severe arcing may occur resulting in burns, ignition or welding of parts. Do not attempt to make connections while the output is live. The Option 602 kit provides bus bar spacers to permit parallel operation between vertical power supplies, such as those in an equipment rack.

  • Page 137: Index

    Index —A— 667xA, 69 668xA and 669xA, 76 ac disconnect switch, 47, 48 accessories, 13 CC loop compensation 668xA, 129 air clearence, 44 curves, 130 air flow, 44, 52 analog CC mode, 91, 129, 130 characteristics connector, 43 analog port, 60 664xA, 17 665xA, 22 characteristics.
  • Page 138 —E— —G— energy hazard, 54, 76, 90, 95, 108, 132 general information, 11 error messages GPIB calibration, 99 address, 55, 93 checksum, 58 address, primary, 83, 93 power-on, 57 address, secondary, 83, 93 run-time, 58 GPIB system supplies, 13 selftest, 57 ground system.
  • Page 139 location, 44 power cord, 12, 43 664xA and 665xA, 45 667xA, 45 —M— 668xA, 47 669xA, 48 manuals, 11, 41 installation, 45 message power receptacle, 12 CAL DENIED, 98 power-on selftest, 52 error. See error messages preliminary checkout, 51 OC, 91 print date, 4 OUT OF RANGE, 89, 90 programming...
  • Page 140 Service guide, 13 667xA, 71 shock hazard, 119, 120, 121, 126, 132 slide mount kit, 13 —V— specifications, 15 664xA, 16 verification, 105 665xA, 21 current monitor resistor, 105 667xA, 26 current programming and readback, 108 668xA, 31 equipment required, 105 669xA, 36 test parameters for 664xA, 109 support rails, 44...
  • Page 141 Agilent Sales and Support Offices For more information about Agilent Technologies test and measurement products, applications, services, and for a current sales office listing, visit our web site: http://www.agilent.com/find/tmdir You can also contact one of the following centers and ask for a test and measurement sales representative.
  • Page 142 Manual Updates The following updates have been made to this manual since the original print date. 3/01/02 All references to the front panel Check Fuses LED on series 668xA have been removed. 5/01/02 Additional information has been added about Power Cord options. The CC rms noise specification for series 668xA and 669xA is categorized as a supplemental characteristics.

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