Agilent Technologies Model 6680A: 3302A-00101 manual

OPERATING GUIDE GPIB DC POWER SUPPLIES Agilent Technologies Models 664xA, 665xA, 667xA, and 668xA AGILENT Model 6641A: 3217A-00111 and Above * AGILENT Model 6642A: 3204A-00111 and Above * AGILENT Model 6643A: 3205A-00111 and Above * AGILENT Model 6644A: 3213A-00111 and Above * AGILENT Model 6645A: 3215A-00111 and Above * AGILENT Model 6651A: 3130A-[...]

2 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 Bureau of Standards, to the extent allowed by the Bureau’s calibration facility, and to the cal[...]

3 SAFETY SUMMARY The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to com ply with these precautions or with specific warnings elsewhere in this m anual violates safety standards of design, m anufacture, and intended use of the instrument. Agilent Technologies a[...]

4 SAFETY SUMMARY (continued) GENERAL Any LEDs used in this product are Class 1 LEDs as per IEC 825-l. ENVIRONMENTAL CONDITIONS With the exceptions noted, all instruments are intended for indoor use in an installation category II, pollution degree 2 environment. They are designed to operate at a maximum relative humidity of 95% and at altitudes of u[...]

5 DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN 45014 Manufacturer’s Name: Agilent Technologies Inc. Manufacturer’s Address: 140 Green Pond Road Rockaway, New Jersey 07866 U.S.A. declares that the Product Product Name: a) Single Output System Power Supply b) General Purpose Power Supply Model Number: a) Agilent 6641A, 6642A, 66[...]

6 DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN 45014 Manufacturer’s Name: Agilent Technologies Inc. Manufacturer’s Address: 140 Green Pond Road Rockaway, New Jersey 078 66 U.S.A. declares that the Product Product Name: a) Single Output System Power Supply b) General Purpose Power Supply Model Number: a) Agilent 6651A, 6652A, 6[...]

7 DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN 45014 Manufacturer’s Name: Agilent Technologies Inc. Manufacturer’s Address: 140 Green Pond Road Rockaway, New Jersey 07866 U.S.A. declares that the Product Product Name: a) Single Output System Power Supply b) General Purpose Power Supply Model Number: a) Agilent 6671A, 6672A, 66[...]

8 PRINTING HISTORY The edition and current revision of this manual are indicated below. Reprints of this manual containing minor corrections and updates may have the same printing date. Revised editions are identified by a new printing date. A revised edition incorporates all new or corrected material since the previous printing date. Changes to th[...]

9 Table Of Contents 1 General Information Introduction ................................................................................................................... ................................ 15 Safety Considerations ...................................................................................................... ..................[...]

10 4 User Connections Rear Panel Connections ......................................................................................................... ........................ 57 Load Wire Selection .......................................................................................................... .......................... 57 Analog Connect[...]

11 A Calibration Introduction ................................................................................................................... ................................ 93 Equipment Required ................................................................................................................................... 93 General Proced[...]

12 F Using Agilent 668xA Series Power Supplies in Autoparallel Auto parallel Procedure ........................................................................................................ ....................... 129 Index References .................................................................................................................[...]

13 List of Figures 2-1. Series 664xA/665xA Power Connection .................................................................................. 45 2-2. Connecting the Series 667xA Power Cord ............................................................................... 46 2-3. 667xA Connection to a 3-Phase Line .....................................[...]

14 List of Tables l-la. Performance Specifications - Series 664xA ............................................................................. 20 l-lb. Supplemental Characteristics - Series 664xA .......................................................................... 21 1-2a. Performance Specifications - Series 665xA ...........................[...]

General Information 15 1 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 1 Topic Location Calibrating the power supply Appendix A - this guide Compatibility program[...]

General Information 16 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[...]

General Information 17 List of Options (continued) Option Description Used with Agilent Series 664xA 665xA 667xA 668xA 909 Rack mount kit with handles (Agilent 5062 -3975) x 909 Rack mount kit with handles (Agilent 5062 -3983) Support rails (E3663A) are required. xx Rack mount kit with handles (Agilent 5062 -3983 & 5062-3974) Support rails (E36[...]

General Information 18 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. ■ Pushbutton nonvolatile storage and recall of up to 5 operating states (4 in Series 668x[...]

General Information 19 Output Characteristic General The power supply can operate in either CV (constant voltage) or CC (constant current) over its voltage and current ratings (see Table 1-l). The operating locus is shown by the Output Characteristic Curve in Table 1 -2. The operating point is determined by the voltage setting (V s ), the current s[...]

General Information 20 Table 1-1a. Performance Specifications for Series 664xA 1 Parameter Agilent Model Number 6641A 6642A 6643A 6644A 6645A Output Ratings Voltage: 0 - 8 V 0 - 20 V 0 - 35 V 0 - 60 V 0 - 120 V Current:@ 40 ° C 0 - 20 A 0 - 10 A 0 - 6 A 0 - 3.5 A 0 - 1.5 A Current:@ 50 ° C 0 - 18 A 0 - 9 A 0 - 5.4 A 0 - 3.2 A 0 - 1.4 A Current:@ [...]

General Information 21 Table 1-1b. Supplemental Characteristics for Series 664xA 1 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 Current: 20.475 A 10.237 A 6.142 A 3.583 A 1.535 A Overvoltage Protection (OVP): 8.8 V 22.0 V 38.5[...]

General Information 22 Table 1-lb. Supplemental Characteristics for Series 664xA (continued) 1 Parameter Agilent Model Number 6641A 6642A 6643A 6644A 6645A Maximum AC Line Current Ratings 100 Vac nominal: 120 Vac nominal: 220 Vac nominal: 230 Vac nominal: 240 Vac nominal: 4.4 A rms 3.8 A rms 2.2 A rms 2.1 A rms 2.0 A rms Maximum Reverse Bias Curren[...]

General Information 23 Table 1-1b. Supplemental Characteristics for Series 664xA (continued) 1 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: Designed to comply with : C[...]

General Information 24 Table 1-1b. Supplemental Characteristics for Series 664xA (continued) 1 Parameter All Models Output Impedance Curves (Typical): Notes: l For Performance Specifications, see Table l -la.[...]

General Information 25 Table 1-2a. Performance Specifications for Series 665xA 1 Parameter Agilent Model Number 6651A 6652A 6653A 6654A 6655A Output Ratings Voltage: 0 - 8 V 0 - 20 V 0- 35 V 0 - 60 V 0 - 120 V Current:@ 40 ° C 0 - 50 A 0 - 25 A 0 - 15 A 0 - 9 A 0 - 4 A Current:@ 50 ° C 0 - 45 A 0 - 22.5 A 0 - 13.5 A 0 - 8.1 A 0 - 3.6 A Current:@ [...]

General Information 26 Table 1-2b. Supplemental Characteristics for Series 665xA 1 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): 8.8 V 22.0 V 38.[...]

General Informatio n 27 Table 1 -2b. Supplemental Characteristics for Series 665xA (continued) 1 Parameter Agilent Model Number 6651A 6652A 6653A 6654A 6655A Maximum AC Line Current Ratings 100 Vac nominal: 120 Vac nominal: 220 Vac nominal: 230 Vac nominal: 240 Vac nominal: 12 A rms (15 AM fuse) 10 A rms (12 AM fuse) 5.7 A rms (7 AM fuse) 5.5 A rms[...]

General Information 28 Table 1-2b. Supplemental Characteristics for Series 665xA (continued) 1 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: Designed to comply with : C[...]

General Information 29 Table 1-2b. Supplemental Characteristics for Series 665xA (continued) 1 Parameter All Models Output Impedance Curves (Typical): Notes: l For Performance Specifications, see Table l -2a.[...]

General Information 30 Table 1-3a. Performance Specifications for Series 667xA 1 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 0 - 35 A 0 - 18 A Programming Accuracy (@ calibration temperature* ± 5 °C) Voltage: 0.[...]

General Information 31 Table 1-3b. Supplemental Characteristics for Series 667xA 1 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): 10.0 V 24.0 V 42.[...]

General Information 32 Table 1-3b. Supplemental Characteristics for Series 667xA (continued) 1 Parameter Agilent Model Number 6671A 6672A 6673A 6674A 6675A Remote Sensing Capability Voltage Drop Per Lead: Load Voltage: Up to 1/2 of rated output voltage. Subtract voltage drop in load leads from specified output voltage rating. Load Regulation: Degra[...]

General Information 33 Table 1-3b. Supplemental Characteristics for Series 667xA (continued) 1 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: Designed to comply with : C[...]

General Information 34 Table 1-3b. Supplemental Characteristics for Series 667xA (continued) 1 Parameter All Models Output Impedance Curves (Typical): Notes: l For Performance Specifications, see Table l -3a.[...]

General Information 35 Table 1-4a. Performance Specifications for Series 668xA 1 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 0 - 128 A *Derated linearly 1%/ ° C from 40 ° C to 55 ° C Programming Accuracy (@ 25 ± 5[...]

General Information 36 Table 1-4b. Supplemental Characteristics for Series 668xA 1 Parameter Agilent Model Number 6680A 6681A 6682A 6683A 6684A Output Programming Range (maximum programmable values) Voltage: 5.125 V 8.190 V 21.50 V 32.75 V 41.0 V Current: 895 A 592 A 246 A 164 A 131 A Overvoltage Protection (OVP): 6.25 V 10.0 V 25.2 V 38.4 V 48.0 V[...]

General Information 37 Table 1-4b. Supplemental Characteristics for Series 668xA (continued) 1 Parameter Agilent Model Number 6680A 6681A 6682A 6683A 6684A Remote Sensing Capability Voltage Drop Per Lead: Load Voltage: Up to 1/2 of rated output voltage. Subtract voltage drop in load leads from specified output voltage rating. Load Regulation: Degra[...]

General Information 38 Table 1-4b. Supplemental Characteristics for Series 668xA (continued) 1 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 t[...]

General Information 39 Table 1-4b. Supplemental Characteristics for Series 668xA (continued) 1 Parameter All Models Output Impedance Curves (Typical): OUTPUT IMPE DANCE (MILL IOHMS) 100 1K 10K 20 10 5 2.5 1.2 5 0.6 25 0.312 0.156 0.078 0.039 0.0195 50K 30 Agilent 6680A FREQUENCY (HZ) * ** CV M ODE CC M ODE 1K 10K 20 10 5 2.5 1.25 0.625 0.312 0.156 [...]

General Information 40 Table 1-5. Supplemental GPIB Characteristics For All Models Parameter All Models Digital Port Characteristics Maximum ratings: 16.5 Vdc between terminals 1 & 2; 3 & 4; and from 1 or 2 to chassis ground FLT/INH Operation FLT/INH Terminals 1 & 2 I ol (low -level output current) V ol (low-level output voltage) 1.25 m[...]

General Information 41 Table 1-6. Operator Replaceable Parts List Description Agilent Part No. (Unless otherwise specified, parts apply to all models.) Cable assembly, GPIB Cable assembly, serial link Collar, rotary output control Cover, ac input safety Series 667xA, w/strain relief connector & rubber boot Series 668xA (See “Accessories”) ([...]

General Information 42 Table 1-6. Operator Replaceable Parts List (continued) Description Agilent Part No. (Unless otherwise specified, parts apply to all models.) Screw, output bus bar Series 665xA only Series 667xA only, 1/4-20x1/2 Screw, outer cover, M5 x 0.8 mm Screw, output sense terminal, M3x0.5x8mm Slide mount kit Standoff, GPIB Terminal, cr[...]

Installation 43 2 Installation Inspection Damage 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 the nearest Agilent Sales and Support Office immediately. Warranty information is printed in the front of this guide. Packaging Material Un[...]

Installation 44 Table 2-1. Items Supplied (continued) Output hardware Series 667xA only Output hardware (screws with nuts and lockwashers) for securing your load wires to the output bus bars (see Table 1-6). Pack return system Series 668xA Only (Agilent P/N 5080-2430). Materials and instructions for properly disposing of the shipping carton and pac[...]

Installation 45 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 corresponds to the nominal line voltage of your power source. If i[...]

Installation 46 Installing the Power Cord Installation of the power cord must be done by a qualified electrician and in accordance with local electrical codes. 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 atta[...]

Installation 47 Figure 2-3. 667xA Connection to a 3-Phase Line Series 668xA Supplies Line Wiring The power supply requires a 3-phase power source that provides 7350 VA (6000 W) maximum. The power supply has a delta input (no neutral connection) and will accept power from either delta (triangle) or wye (star) sources. Two voltage ranges are availabl[...]

Installation 48 Installing the Power Cord Installation of the power cord must be done by a qualified electrician and in accordance with local electrical code The power cords supplied with the power supply do not include a power plug (see "Options" in Chapter l) at one end of the cord. Terminating connectors and a ground lug are attached t[...]

Turn-On Checkout 49 3 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[...]

Turn-On Checkout 50 Power-On Checkout (All Models) 1. Connect the power cord to the power source (for Series 668xA, turn on the safety disconnect switch). 2. Turn the front panel power switch to ON (1). 3. For Series 668xA only, the Check Fuses and Dew LEDs should remain off. If either light is on or is blinking, go to “In Case of Trouble” at t[...]

Turn-On Checkout 51 Checking the Voltage Function (All Models) 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 Output Terminals O[...]

Turn-On Checkout 52 Checking the Current Function ENERGY HAZARD . Some supplies (Series 668xA) 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 [...]

Turn-On Checkout 53 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 tu[...]

Turn-On Checkout 54 Series 664xA and 665xA Supplies The line fuse is located on the rear panel (3, Figure 2 -l). Proceed as follows: 1. Turn off the front panel power switch. 2. Using a screwdriver, remove the fuse from the fuseholder. Replace it with one of the same type (see Table 1 -5 in Chapter l). Do not use a time-delay type fuse. 3. Turn on [...]

Turn-On Checkout 55 Series 668xA Supplies The line fuses are located on the rear panel (see Figure 2 -4). 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. Remove the ac input safety cover from the rear panel. 3. Unscrew the fuse caps and remove the fuse[...]

Turn-On Checkout 56 Checksum Errors. If the display shows EE CHKSUM , the power supply has detected an EEPROM checksum error. A checksum error can occur due to the following conditions: ■ Excessive number of write cycles to an EEPROM (see "Nonvolatile Memory Write Cycles" in "Supplemental Characteristics" tables). This conditi[...]

User Connections 57 4 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: l Series 664xA and 665xA l Series 667xA l Seri[...]

User Connections 58 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 Agilent Series 664xA & 665xA IP Current programming input. VP Voltage programmi[...]

User Connections 59 Connecting Series 664xA and 665xA Power Supplies To The Load  Output Safety Cover ó + Output Terminal ì - Output Terminal ö Signal Common ú Output Sense Switch ÷ Analog Connector Figure 4-3a. Series 664xA and 665xA Rear Panel Output Connections Output Isolation The output of the power supply is isolated from earth ground[...]

User Connections 60 Series 664xA/665xA Power Supplies, Maximum OVP External Capacitance ( 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 trippin[...]

User Connections 61 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 vo[...]

User Connections 62 Stability Using remote sensing under unusual combinations of load -lead lengths and large load capacitance s 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.[...]

User Connections 63  Load Connection ó Loads ì 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 [...]

User Connections 64 Auto-Parallel Programming. Program only the first ("master") supply in the series; the "slave" supplies automatically track the master’s output. 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 supplie[...]

User Connections 65 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[...]

User Connections 66 Be careful of capacitive coupling from the programming inputs to other lines wired to the analog connector. Such coupling can cause output oscillations. You can minimize coupling by bundling the IP, VP, and Common P lines and keeping them separated from other wires. Twisting these three lines together is also recommended.  An[...]

User Connections 67  Output Safety Cover ó Analog Connector ì -Output Bus Bar ö -Local Sense Terminal ú + Local Sense Terminal ÷ + Output Bus Bar ø Signal Common í Local Sense Jumpers û Rear Knockouts ç 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[...]

User Connections 68 Q= L 1 RC xt int e R + where: C = model-dependent internal capacitance (see below); L = inductance of the load; Rext = equivalent series resistance of the load; R int = model-dependent internal resistance (see below): 6671A 6672A 6673A 6674A 6675A C= 44,000 µ F 44,000 µ F 12,000 µ F 7,000 µ F 2,100 µ F R int = 1.8 m Ω 2.2[...]

User Connections 69 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 re[...]

User Connections 70  Load Leads ó 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 Operating Configuration Figure 4-4c through Figure 4-4f show the various configurations for connecting to the load. Figure 4 -4g show s how to connect an external voltage sour[...]

User Connections 71  Loads ó Load Connection ì Analog Connector A Connect for remote sensing (optional) B Connect for local sensing (default) Figure 4-4d. Series 667x A 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 [...]

User Connections 72 Auto-Parallel Programming. Program only the first ("master") supply in the series; the "slave" supplies automatically track the master’s output. 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 supplie[...]

User Connections 73 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. See Figure 4-1 for an explanation of these pr[...]

User Connections 74 Connecting Series 668xA 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.  Analog Connector ó -Out[...]

User Connections 75 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. How[...]

User Connections 76 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 [...]

User Connections 77 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 figur[...]

User Connections 78 Connecting Supplies in Auto -Parallel 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 ⊕ output termi[...]

User Connections 79 Program each power supply as an independent supply. If two supplies are used in series operation, each supply can be programmed to deliver 50% of the total output voltage. Set the current limit of each power supply to the maximum that the load can handle without damage. If one supply experiences a desired shutdown condition (suc[...]

User Connections 80 1 = Voltage programming source 0 to -5 V 2 = Current programming source 0 to +5 V 3 = Current programming source 0 to -5 V 4 = Current programming source floating 0 to 5 V * Maximum potential between -IP and ↓ P or between +IP and ↓ P is ± 15 V Figure 4-5g. Series 668xA Analog Programming Connections Programming Note from F[...]

User Connections 81 ■ The first power supply in a linked connection is a "direct supply" connected to the controller via a GPIB cable. The direct supply is the only supply connected directly to the bus and has a unique primary bus address. ■ The remaining power supplies are "linked supplies” connected to the direct supply via a[...]

Front Panel Operation 83 5 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 dis[...]

Front Panel Operation 84 Figure 5-1. Front Panel Controls and Indicators Table 5-1. Front Panel Controls and Indicators (see Figure 5 -1) Control or Indicator Function or Indication  Display VOLTS Shows present output voltage of the power supply. AMPS Shows present output current of the power supply. Status Annunciators CV The power supply is in[...]

Front Panel Operation 85 Table 5-1. Front Panel Controls and Indicators (continued) ó Output Rotary Controls Voltage Rotate clockwise to increase output voltage or program setting. Use to rapidly set an approximate output value (see and keys). Current Rotate clockwise to increase output current or program setting. Use to rapidly set an approximate[...]

Front Panel Operation 86 Table 5-1. Front Panel Controls and Indicators (continued) ú ENTRY Keys (continued) thru Press to select numerical values . 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. 3 These four entry keys operate in two modes. Press and[...]

Front Panel Operation 87 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 key . ■ The display will[...]

Front Panel Operation 88 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. ?[...]

Front Panel Operation 89 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 . The OCP annunciator [...]

Front Panel Operation 90 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 m[...]

Front Panel Operation 91 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. From now on it will continue to turn on in[...]

Calibration 93 A Calibration Introduction The power supply may be calibrated either from the front panel or from a controller over the GPIB. The procedures given here apply to all models. Important These instructions do not include verification procedures. If you need to perform verification as a erequisite to or as part of your calibration procedu[...]

Calibration 94 • Output current. • Output current readback. • Current monitor input I M (Series 668xA 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". However, for Series 668xA supplies, the following sequen[...]

Calibration 95 Figure A-1. Calibration Test Setup[...]

Calibration 96 Table A-2. Typical Front Panel Calibration Procedure Action Display Response Enabling the Calibration Mode 1. Begin calibration by pressing . 2. Enter calibration password from Entry keypad. If password is correct the Cal annunciator will come on. If password is incorrect, an error occurs 2 . Note: The initial (factory-default) passw[...]

Calibration 97 Table A-2. Typical Front Panel Calibration Procedure (continued) Action Display Response Calibrating Current Monitor (I M ) (Series 668xA 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 supply. 2. Select [...]

Calibration 98 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 P[...]

Calibration 99 CAL:CURR:MON (Series 668xA only) This command sets the power supply to the current monitor (I MON ) 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: CUR[...]

Calibration 100 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. Two successive values (one for eac[...]

Calibration 101 10 ! Agilent BASIC Calibration Program 20 ! 30 DIM Resp$ [255],Err_msg$[255] 40 ! 50 Volt_cal: ! Voltage DAC calibration 60 Err_found=0 70 PRINT TABXY(5,10),"CONNECT INSTRUMENTS AS SHOWN IN FIG. A -1(1). Then Press Continue" 80 PAUSE 90 CLEAR SCREEN 100 ! 110 ! Assign power supply GPIB address 120 ! 130 ASSIGN @Ps TO 705 1[...]

Calibration 102 540 Password is optional - only required if set to non-zero value 550 Default password is four -digit model number 560 ! 570 ! LINE 590 PASSWORD MUST BE EDITED FOR MODEL OTHER THAN 6680 580 ! 590 OUTPUT @Ps;"C AL:STATE ON, 6680" 600 OUTPUT @Ps;"VOLT:LEV 2" 610 ! Refer to Table A-1 for correct shunt value for mode[...]

Operation Verification 103 B Operation Verification Introduction This appendix provides operation verification test procedures. The tests do not check all the operating parameters, but verify that the power supply is performing properly. The required test equipment and acceptable test results are specified in tables at the end of this appendix. Not[...]

Operation Verification 104 Figure B-1. Verification Test Setup[...]

Operation Verification 105 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-[...]

Operation Verification 106 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. Current Programming an[...]

Operation Verification 107 Table B-4. Operation Verification Test Parameters for Series 664xA Test Description Minimum Spec Results * Maximum Spec Measurement Uncertainty MODEL Agilent 6641A Voltage Programming and Readback Low Voltage (0 V) V out -5 mV ____________ mV + 5 mV 2.0 µ V Front Panel Display Readback Vout -6.0 mV ____________ mV Vout +[...]

Operation Verification 108 Table B-4. Operation Verification Test Parameters for Series 664xA (continued) Test Description Minimum Spec Results * Maximum Spec Measurement Uncertainty MODEL Agilent 6645A Voltage Programming and Readback Low Voltage (0 V) V out -51 mV ____________ mV + 51 mV 2.0 µ V Front Panel Display Readback Vout -80 mV _________[...]

Operation Verification 109 Table B-5. Operation Verification Test Parameters for Series 665xA Test Description Minimum Spec Results * Maximum Spec Measurement Uncertainty MODEL Agilent 6651A Voltage Programming and Readback Low Voltage (0 V) V out -5 mV ____________ mV + 5 mV 2.0 µ V Front Panel Display Readback Vout -6.0 mV ____________ mV Vout +[...]

Operation Verification 110 Table B-5. Operation Verification Test Parameters for Series 665xA (continued) Test Description Minimum Spec Results * Maximum Spec Measurement Uncertainty MODEL Agilent 6655A Voltage Programming and Readback Low Voltage (0 V) V out -51 mV ____________ mV + 51 mV 2.0 µ V Front Panel Display Readback Vout -80 mV _________[...]

Operation Verification 111 Table B-6. Operation Verification Test Parameters for Series 667xA Test Description Minimum Spec Results * Maximum Spec Measurement Uncertainty MODEL Agilent 6671A Voltage Programming and Readback Low Voltage (0 V) V out -8 mV ____________ mV + 8 mV 1.6 µ V Front Panel Display Readback Vout -12 mV ____________ mV Vout +1[...]

Operation Verification 112 Table B-6. Operation Verification Test Parameters for Series 667xA (continued) Test Description Minimum Spec Results * Maximum Spec Measurement Uncertainty MODEL Agilent 6675A Voltage Programming and Readback Low Voltage (0 V) V out -120 mV ____________ mV + 120 mV 3.0 µ V Front Panel Display Readback Vout -180 mV ______[...]

Operation Verification 113 Table B-7. Operation Verification Test Parameters for Series 668xA Test Description Minimum Spec Results * Maximum Spec Measurement Uncertainty MODEL Agilent 6680A Voltage Programming and Readback Low Voltage (0 V) V out -0.005 V ____________ V + 0.005 V 1.0 µ V Front Panel Display Readback Vout -7.5 mV ____________ mV V[...]

Operation Verification 114 Test Description Minimum Spec Results * Maximum Spec Measurement Uncertainty MODEL Agilent 6684A Voltage Programming and Readback Low Voltage (0 V) V out -40 mV ____________ mV + 40 mV 2.0 µ V Front Panel Display Readback Vout -60 mV ____________ mV Vout +60 mV 2.0 µ V High Voltage (40 V) V out 39.944 V _____________V 4[...]

Line Voltage Conversion 115 C 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 [...]

116 Line Voltage Conversion 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 s[...]

Line Voltage Conversion 117 Series 668xA 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 changing jumper cable positions on the ac input of the main power tra[...]

118 Line Voltage Conversion Figure C-4. Removing the Series 668xA Inner Cover Figure C-5. Series 668xA Line Conversion Jumpers[...]

Digital Port Functions 119 D 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 Digita[...]

120 Digital Port Functions 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. It also sets the RI event bit in the supply’s[...]

Digital Port Functions 121 GPIB GPIB GPIB Figure D-3. Examples of FLT Outputs Figure D-4. Digital Port Configuration Jumper[...]

122 Digital Port Functions 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 Figu re D-4. To change the port configuration, you must mov[...]

Digital Port Functions 123 Relay Link Operation 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. Not used with units that output more than 50 amps. RLY SEND (pin 1) Provides the serial data to control the relays in th[...]

Current Loop Compensation (Series 668xA Only) 125 E Current Loop Compensation (Series 668xA Only) 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[...]

126 Current Loop Compensation (Series 668xA Only) 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 ). This will r[...]

Current Loop Compensation (Series 668xA Only) 127 Figure E-1. CC Loop Compensation Curves For Models 6682A and 6683A[...]

128 Current Loop Compensation (Series 668xA Only) Figure E-1. CC Loop Compensatio n 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 t[...]

Using Agilent 668xA Series Power Supplies in Autoparallel 129 F Using Agilent 668xA Series Power Supplies in Autoparallel This information is supplementary to the information on page 80. A maximum of three Agilent 668xA series power supplies having the same model number, may be configured for autoparallel operation. The Agilent 668xA power supplies[...]

130 Using Agilent 668xA Series Power Supplies in Autoparallel 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 Note 2 All Agilent 668xA power supplies have an output current programmed at power-on. The d[...]

Index 131 Index A ac disconnect switch (Series 668xA), 47 air clearance, 44 air fan, 50 analog port, 58 characteristics (see Supplemental Characteristics) connector configuration, 58 signals, 58 analog programming (see external voltage control) annunciators, 84 Addr, 50, 84 CC, 17, 60, 84 CV, 50, 84 Cal, 84, 96 Dis, 50, 52, 53, 84 Err, 84 OCP, 52, [...]

132 Index F FLT output, 18, 58, 119-121 front panel, 83-86 front panel annunciators (see "annunciators") front panel data ENTRY keys, 85 front panel keys, 84-86 , 50, 85, 87, 88 , 53, 85, 91 , 99 , 86 , 52, 85, 88, 90 , 52, 85, 88 , 52, 85, 88 , 50, 88 , 85 , 85 , 52-53, 85, 89 , 50, 85, 87-89 , 51, 85, 88 , 51, 85, 88-89 , 51, 85, 88-89 [...]

Index 133 L LED (see front panel LEDs) line cord Series 664xA/665xA, 45 Series 667xA, 46 Series 668xA, 48 line fuse (see fuse) line phase balancing (Series 668xA), 47 local voltage sensing Series 664xA/665xA, 60-61 Series 667xA, 68 Series 668xA, 75 load capacitive (see capacitive load) inductive (see inductive load) load line, 20 load L/R ratio (Se[...]

134 Index resistor current monitoring (see current monitoring resistor) sense protect (Series 668xA), 76 RI input, 18, 79, 120 reset conditions (see the Programming Guide) S safety class, 16 safety compliance Series 664xA, 23 Series 665xA, 28 Series 667xA, 33 Series 668xA, 38 safety disconnect (Series 668xA), 47 safety cover, ac input, 41 safety wa[...]

Agilent Sales and Support Offices 135 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 measurem[...]

Manual Updates The following updates have been made to this manual since the print revision indicated on the title page. 4/01/00 All references to HP have been changed to Agilent. All references to HP-IB have been changed to GPIB.[...]