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Agilent Technologies 6641A, Operating Manual

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Current Loop Compensation (Series 668xA Only)   129 

E

 

 

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. Two sets of curves show 
the small-signal response for each model. The dashed curves represent programming performance of no more than 10% 
current overshoot. The solid curves represent operating conditions with 25% overshoot. The curve obtained with all 
switches open gives the fastest CC mode crossover response time. However, as shown by these curves, the loop will not 
tolerate larger inductances unless the load resistance is increased. The curve described when all switch positions are closed 
shows the as-shipped performance curve. This position provides 10% overshoot and fast CV/CC crossover performance for 
load inductances that are specific for each model. (For Models 6680A and 6681A, this curve ranges from 100 

µ

ohms at 

15 

µ

henries to about 100 milliohms at 40 millihenries.). You can select a different compensation curve by opening a 

specific switch or combination of switches. 
 
Table E-1 shows some specific L 

÷

 R ratios and the switch positions required for these ratios. 

Table E-1 is valid only for 

Models 6680A and 6681A - you must use the curves for the remaining models. 

The corresponding 10% overshoot 

curves are shown in Figure E-1. As operation moves along the curves from left to right, the switch positions must be 
changed as shown along the X-axis. 
 

Table E-1. 

Settings For CC Loop Compensation Switch (Models 6680A and 6681A Only) 

 

Load Characteristic (L/R) 

 

1

Switch Setting 

 

7 6 5 4 3 2 1 

1 

µ

H/3 m

Ω

  0 0 0 0 0 0 0 

2

15 

µ

H/100 

µΩ

  1 1 1 1 1 1 1 

30 

µ

H/100 

µΩ

  0 0 0 0 0 0 1 

100 

µ

H/100 

µΩ

  1 1 1 1 1 1 0 

150 

µ

H/100 

µΩ

  0 0 0 0 0 1 0 

600 

µ

H/100 

µΩ

  1 1 1 1 1 0 0 

1.2 mH/100 

µΩ

  0 0 0 0 1 0 0 

4 mH/100 

µΩ

  1 1 1 1 0 0 0 

10 mH/100 

µΩ

  0 0 0 1 0 0 0 

40 mH/100

µΩ

  1 1 1 0 0 0 0 

100 mH/100 

µΩ

  0 0 1 0 0 0 0 

380 mH/100 

µΩ

  1 1 0 0 0 0 0 

650 mH/100 

µΩ

  0 1 0 0 0 0 0 

7 H/100 

µΩ

  1 0 0 0 0 0 0 

 

1

  "1" = switch closed; "0" = switch open.     

2

 Factory setting. 

 

 
 

Summary of Contents for 6641A

Page 1: ...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: ...cts returned to Customer from another country Agilent Technologies shall pay for return of products to Customer Warranty services outside the country of initial purchase are included in Agilent Technologies product price only if Customer pays Agilent Technologies international prices defined as destination local currency price or U S or Geneva Export price If Agilent Technologies is unable within ...

Page 3: ... any other connection is made Any interruption of the protective grounding conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury If the instrument is to be energized via an external autotransformer for voltage reduction be certain that the autotransformer common terminal is connected to the neutral earthed pole of the a...

Page 4: ... not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met 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 t...

Page 5: ...the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC including 93 68 EEC and carries the CE Marking accordingly EMC Information ISM Group 1 Class A Emissions As detailed in Electromagnetic Compatibility EMC Certificate of Conformance Number CC TCF 02 020 based on Technical Construction File TCF HPNJ2 dated June 4 2002 Assessed by Celestica Ltd Appointed Competent Body Westfields Ho...

Page 6: ...ve 89 336 EEC including 93 68 EEC and carries the CE Marking accordingly EMC Information ISM Group 1 Class A Emissions As detailed in Electromagnetic Compatibility EMC Certificate of Conformance Number CC TCF 00 074 based on Technical Construction File TCF HPNJ1 dated Oct 27 1997 Assessed by Celestica Ltd Appointed Competent Body Westfields House West Avenue Kidsgrove Stoke on Trent Straffordshire...

Page 7: ...nd carries the CE Marking accordingly EMC Information ISM Group 1 Class A Emissions As detailed in Electromagnetic Compatibility EMC Certificate of Conformance Number CC TCF 00 074 based on Technical Construction File TCF HPNJ1 dated Oct 27 1997 Assessed by Celestica Ltd Appointed Competent Body Westfields House West Avenue Kidsgrove Stoke on Trent Straffordshire ST7 1TL United Kingdom Safety Info...

Page 8: ...ce 44 Input Power Source 45 Installing the Series 664xA and 665xA Power Cord 45 Installing the Series 667xA Power Cord 45 Installing the Series 668xA Power Cord 47 Installing the Series 669xA Power Cord 48 TURN ON CHECKOUT 51 Introduction 51 Preliminary Checkout All Models 51 Power On Checkout All Models 52 Using the Keypad All Models 52 Shifted Keys 52 Backspace Key 52 Output Checkout All Models ...

Page 9: ...el 73 Connecting Supplies in Series 74 External Voltage Control 75 Connecting Series 668xA and 669xA Power Supplies to the Load 76 Output Isolation 76 Load Considerations 76 Local Voltage Sensing 77 Remote Voltage Sensing 77 Connecting One Power Supply to a Single Load 79 Connecting One Power Supply to Multiple Loads 79 Connecting Supplies in Auto Parallel 80 Connecting Supplies in Series 81 Exter...

Page 10: ...5 List of Equipment 105 Current Monitoring Resistor 105 Performing the Tests 107 General Measurement Techniques 107 Programming the Power Supply 107 Order of Tests 107 Turn on Checkout 107 Voltage Programming and Readback Accuracy 107 Current Programming and Readback Accuracy 108 LINE VOLTAGE CONVERSION 119 Series 664xA and 665xA Power Supplies 119 Series 667xA Power Supplies 120 Series 668xA 669x...

Page 11: ... Power supply operating characteristics Chapter 1 this guide Power supply options Chapter 1 this guide Power supply performance specifications Chapter 1 this guide Programming discrete fault inhibit DFI operation Chapter 4 Programming Guide from the analog port Chapter 4 this guide from the front panel Chapter 5 this guide over the GPIB Chapter 2 Programming Guide remote inhibit RI operation Chapt...

Page 12: ...ons Option Description Used with Agilent Series 664xA 665xA 667xA 668xA 669xA 100 Input power 87 106 Vac with power cord x x 120 Input power 104 127 Vac with power cord x x 220 Input power 191 233 Vac with power cord x x 240 Input power 209 250 Vac with power cord x x 200 Input power 174 220 Vac without power cord x 230 Input power 191 250 Vac without power cord x 208 Input power 180 235 Vac 3 pha...

Page 13: ...for 180 235 Vac 3 phase line 5065 6934 Input line voltage conversion kit for Series 668xA 208 VAC input line conversion kit 5188 4263 400 VAC input line conversion kit 5188 4270 Input line voltage conversion kit for Series 669xA 208 VAC input line conversion kit 5188 4271 400 VAC input line conversion kit 5188 4272 GPIB cable all models 0 5 meters 1 6 ft 10833D 1 0 meter 3 3 ft 10833A 2 0 meters 6...

Page 14: ... power supply including changing the calibration protection password Remote Programming The power supply may be remotely programmed via the GPIB bus and or from an analog input port GPIB programming is with SCPI Standard Commands for Programmable Instruments commands that make the power supply programs compatible with those of other GPIB instruments A software controlled Compatibility Mode also pe...

Page 15: ...A supplies this capability is defined by the second quadrant area Is of the Output Characteristic Curve These supplies can sink about 20 of their maximum rated positive output current For Series 667xA 668xA and 669xA power supplies this is an uncharacterized current sinking area that provides a limited downprogramming capability Specifications and Supplemental Characteristics Tables 1 1 through 1 ...

Page 16: ...oltage 0 07 6 mV 15 mV 25 mV 40 mV 80 mV Current 0 15 18 mA 9 1 mA 5 mA 3 mA 1 3 mA Current 0 35 40 mA 20 mA 12 mA 6 8 mA 2 9 mA Load Regulation change in output voltage or current for any load change within ratings Voltage 1 mV 2 mV 3 mV 4 mV 5 mV Current 1 mA 0 5 mA 0 25 mA 0 25 mA 0 25 mA Line Regulation change in output voltage or current for any line change within ratings Voltage 0 5 mV 0 5 m...

Page 17: ...A 1 8 mA Referenced to supply output Drift Temperature Stability following a 30 minute warmup change in output over 8 hours under constant line load and ambient temperature Voltage 0 02 0 4 mV 1 mV 2 mV 3 mV 6 mV Current 0 02 16 mA 6 mA 3 mA 2 mA 1 mA Temperature Coefficients change per C Voltage 60 ppm 0 1 mV 0 2 mV 0 3 mV 0 5 mV 1 1 mV Current 95 ppm 0 82 mA 0 41 mA 0 18 mA 0 12 mA 0 04 mA Volta...

Page 18: ...oltage rating 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 Downprogrammer Current Capability 15 5 8 A 2 5 A 1 5 A 0 9 A 0 75 A Output Voltage Programming Response Time Rise Fall Time time for output to change from 90 to 10 or from 10 to 90 of its total excursion 15 ms Settling Time time f...

Page 19: ...erval 1 year Safety Compliance Complies with Designed to comply with CSA 22 2 No 231 IEC 348 UL 1244 RFI Suppression complies with CISPR ll Group 1 Class B Dimensions Width Height including removable feet Depth including safety cover 425 5 mm 16 75 in 88 1 mm 3 5 in 439 mm 17 3 in Note 1 For Performance Specifications see Table l la Weight Net Shipping 14 2 kg 31 4 lb 16 3 kg 36 lb Output Characte...

Page 20: ...General Information 20 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 ...

Page 21: ... 5 C Voltage 0 07 6 mV 15 mV 25 mV 40 mV 80 mV Current 0 15 67 mA 26 mA 15 mA 7 mA 3 mA Current 0 35 100 mA 44 mA 24 mA 15 mA 7 mA Load Regulation change in output voltage or current for any load change within ratings Voltage 1 mV 2 mV 3 mV 4 mV 5 mV Current 2 mA 1 mA 0 5 mA 0 5 mA 0 5 mA Line Regulation change in output voltage or current for any line change within ratings Voltage 0 5 mV 0 5 mV 1...

Page 22: ...5 mA Referenced to supply output Drift Temperature Stability following a 30 minute warmup change in output over eight hours under constant line load and ambient temperature Voltage 0 02 0 4 mV 1 mV 2 mV 3 mV 6 mV Current 0 02 40 mA 15 mA 8 mA 5 mA 2 5 mA Temperature Coefficients change per C Voltage 60 ppm 0 1 mV 0 2 mV 0 3 mV 0 5 mV 1 1 mV Current 90 ppm 1 4 mA 0 7 mA 0 3 mA 0 2 mA 0 2 mA Voltage...

Page 23: ...ads from specified output voltage rating 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 Downprogrammer Current Capability 15 11 6 A 5 A 3 A 1 8 A 1 5 A Output Voltage Programming Response Time Rise Fall Time time for output to change from 90 to 10 or from 10 to 90 of its total excursion 15 ...

Page 24: ...Recommended Calibration Interval 1 year Safety Compliance Complies with Designed to comply with CSA 22 2 No 231 IEC 348 UL 1244 RFI Suppression complies with CISPR ll Group 1 Class B Dimensions Width Height including removable feet Depth including safety cover 425 5 mm 16 75 in 132 6 mm 5 22 in 497 8 mm 19 6 in Weight Net Shipping 25 kg 54 lb 28 kg 61 lb Output Characteristic Curve Notes l For Per...

Page 25: ...General Information 25 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 ...

Page 26: ...80 mV Current 0 1 150 mA 100 mA 60 mA 35 mA 18 mA Load Regulation change in output voltage or current for any load change within ratings Voltage 0 002 300 µV 650 µV 1 2 mV 2 mV 4 mV Current 0 005 10 mA 7 mA 4 mA 2 mA 1 mA Line Regulation change in output voltage or current for any line change within ratings Voltage 0 002 300 µV 650 µV 1 2 mV 2 mV 4 mV Current 0 005 10 mA 7 mA 4 mA 2 mA 1 mA bisep ...

Page 27: ...e Voltage 0 02 0 24 mV 0 6 mV 1 mV 1 8 mV 3 6 mV Current 0 02 69 mA 35 mA 20 mA 10 mA 6 mA Temperature Coefficients change per C after 30 minute warmup Voltage 50 ppm 0 04 mV 0 2 mV 0 7 mV 1 2 mV 2 4 mV Current 75 ppm 25 mA 12 mA 7 mA 4 mA 2 mA Voltage Readback 60 ppm 0 1 mV 0 3 mV 1 mV 1 2 mV 3 mV Current Readback 85 ppm 30 mA 15 mA 9 mA 5 mA 2 5 mA Overvoltage Protection OVP 200 ppm 1 8 mV 5 mV ...

Page 28: ...on 30 ms 60 ms 130 ms 130 ms 195 ms Full load programming speed up down time time for output to settle within 4 LSBs of the final value 85 ms 190 ms 380 ms 380 ms 600 ms No load downprogrammiug discharge time time for output to fall to 0 5 V when programmed from full voltage to zero volts 130 ms 250 ms 350 ms 600 ms 600 ms All values exclude command processing time With full resistive load VRATED ...

Page 29: ...ecommended Calibration Interval 1 year Safety Compliance Complies with Designed to comply with CSA 22 2 No 231 IEC 348 UL 1244 RFI Suppression complies with CISPR ll Group 1 Class B Dimensions Width Height including removable feet Depth including safety cover 425 5 mm 16 75 in 145 1 mm 5 71 in 640 mm 25 2 in Weight Net Shipping 27 7 kg 61 lb 31 4 kg 69 lb Output Characteristic Curve Notes l For Pe...

Page 30: ...General Information 30 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 ...

Page 31: ...A 165 mA 110 mA 90 mA Load Regulation change in output voltage or current for any load change within ratings Voltage 0 002 190 µV 300 µV 650 µV 1 1 mV 1 5 mV Current 0 005 65 mA 40 mA 17 mA 12 mA 9 mA Line Regulation change in output voltage or current for any line change within ratings Voltage 0 002 190 µV 300 µV 650 µV 1 1 mV 1 5 mV Current 0 005 65 mA 40 mA 17 mA 12 mA 9 mA Transient Response T...

Page 32: ...ogramming VP IP Input Signal source must be isolated VP Input Signal 0 to 5 0 V IP Input Signal 0 to 5 0 V Input Impedance VP and IP Inputs 30 kΩ Referenced to common P Referenced to IP differential input signal Current Monitor IM Output Signal 0 125 V to 5 V Drift Temperature Stability following a 30 minute warmup change in output over eight hours under constant line load and ambient temperature ...

Page 33: ...current rating Current must be limited by user s external dc source Load Voltage Subtract voltage drop in load leads from specified output voltage rating Maximum Input Power 7350 VA 6000 W 160 W with no load Maximum AC Line Current Ratings Range 1 Rms line current 21 4 A 27 7 A Line fuse 30 AM Range 2 Rms line current 10 7 A 14 4 A Line fuse 16 AM Includes 5 unbalanced voltage phase condition Outp...

Page 34: ...aximum memory write cycles 4 Location 0 40 000 typical 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 CSA 22 2 No 231 IEC 1010 carries CE mark UL 1244 RFI Suppression complies with CISPR ll Group 1 Class B Dimensions Width Heig...

Page 35: ...CY HZ OUTPUT IMPEDANCE MILLIOHMS CV MODE CC MODE 4040 20 10 5 2 5 1 25 0 625 0 312 0 156 0 0781 0 0391 100 1K 10K 50K 30 Agilent 6682A FREQUENCY HZ OUTPUT IMPEDANCE MILLIOHMS CV MODE CC MODE 80 40 20 10 5 2 5 1 25 0 625 0 312 0 156 0 0781 100 1K 10K 50K 30 Agilent 6683A FREQUENCY HZ OUTPUT IMPEDANCE MILLIOHMS CV MODE CC MODE ALL COMPENSATION SWITCHES OPEN ALL COMPENSATION SWITCHES CLOSED Agilent 6...

Page 36: ...0 mV Current 0 1 300 mA 165 mA 80 mA Load Regulation change in output voltage or current for any load change within ratings Voltage 0 002 650 µV 1 1 mV 2 2 mV Current 0 005 40 mA 17 mA 9 mA Line Regulation change in output voltage or current for any line change within ratings Voltage 0 002 650 µV 650 µV 650 µV Current 0 005 40 5 mA 17 mA 9 mA Transient Response Time for the output voltage to recov...

Page 37: ...Input Signal source must be isolated VP Input Signal 0 to 5 0 V IP Input Signal 0 to 5 0 V Input Impedance VP and IP Inputs 30 kΩ Referenced to common P Referenced to IP differential input signal Current Monitor IM Output Signal 0 125 V to 5 V Drift Temperature Stability following a 30 minute warmup change in output over eight hours under constant line load and ambient temperature Voltage 0 02 0 4...

Page 38: ...e the supply will continuously withstand without damage a current equal to its output current rating Current must be limited by user s external dc source Maximum Input Power 9000 VA 7950 W 175 W with no load Maximum AC Line Current Ratings Range 1 Rms line current 26 A Line fuse 40 AM Range 2 Rms line current 13 A Line fuse 20 AM Output Voltage Programming Response Time Programming Rise Fall Time ...

Page 39: ... 6 GPIB Interface Capabilities see Table 1 6 Serial Link Capabilities see Table 1 6 Recommended Calibration Interval 1 year Safety Compliance Complies with Designed to comply with CSA 22 2 No 231 IEC 1010 carries CE mark UL 1244 RFI Suppression complies with CISPR ll Group 1 Class B Dimensions Width Height including removable feet excluding removable feet Depth without output safety cover 425 5 mm...

Page 40: ...000 Frequency in Hz Magnitude in milliohms CC mode CV mode Agilent 6691A Frequency in Hz Magnitude in milliohms CC mode CV mode 0 01 0 1 1 10 100 1000 10 100 1000 10000 100000 Agilent 6692A All compensation switches open All compensation switches closed Frequency in Hz Magnitude in milliohms CC mode CV mode 0 1 1 10 100 1000 10 100 1000 10000 100000 Notes l For Performance Specifications see Table...

Page 41: ...t 0 4 V Iih high level input current 5 25 V Vil low level input voltage Vih high level input voltage 1 25 mA 250 μA 0 8 V maximum 2 0 V minimum GPIB Interface Capabilities Languages Interface SCPI default Compatibility AH1 C0 DC1 DT1 E1 LE4 PP0 RL1 SH1 SR1 TE6 Serial Link Capabilities multiple supplies sharing one GPIB primary address Maximum number of supplies Maximum number of linked supplies Ma...

Page 42: ...934 Knob rotary output control Lockwasher ac input safety cover Series 667xA and 668xA Lockwasher output bus bar 1 4 spring Series 667xA only Manual Agilent 59510A 11 Relay Accessories Series 603xA Operating Series 664xA and 665xA Service Series 664xA 665xA 667xA 668xA and 669xA Programming Guide Series 667xA Service 0370 1091 2190 0484 3050 1690 5957 6382 5959 3301 5959 3376 5964 8269 5959 3384 N...

Page 43: ...earest Agilent Sales and Support Offices see end of this guide to obtain the correct cord Caution Your power supply cannot use a standard power cord The power cords supplied by Agilent Technologies have heavier gauge wire Series 667xA 668xA 669xA Your power supply was shipped with a power cord appropriate for your location The cord may or may not be terminated in a power plug see Options in Chapte...

Page 44: ...A and 669xA supplies weigh 51 3 kg 113 lb Obtain adequate help when mounting the supply in the rack The power supply can be mounted in a standard l9 inch rack panel or cabinet Rack mounting kits are available as Option 908 or 909 with handles Installation instructions are included with each rack mounting kit Series 667xA 668xA 669xA Series 667xA 668xA 669xA supplies require instrument support rail...

Page 45: ... fuse is located in a fuseholder on the rear panel 3 The rear panel label 1 shows the fuse value used in the power supply and Table 1 6 identifies the replacement fuse Figure 2 1 Series 664xA and 665xA Power Connection Note The detachable power cord may be used as an emergency disconnecting device Removing the power cord from the ac input connector will disconnect ac input power to the unit Instal...

Page 46: ...nput terminal and the line wire to the L input terminal this line is fused inside the supply 4 For line to line operation from a three phase source as shown in Figure 2 3 connect one phase to the N input terminal and another phase to the L input terminal this line is fused inside the supply Note The N terminal is not internally grounded 5 Position the safety cover over the power input terminals an...

Page 47: ...ot include a power plug see Options in Chapter l at one end of the cord Terminating connectors and a ground lug are attached to the other end of the cord See Figure 2 5 and proceed as follows l Check the line fuses Figure 2 5 as follows a Examine the LINE RATING label on the rear panel b Unscrew the line fuse caps from the rear panel and verify that all fuses are as specified on the label Replace ...

Page 48: ...ed back and a ground lug is attached to the other end of the cord Installation of the power cord must be done by a qualified electrician and in accordance with the local electrical code See Figure 2 6 and proceed as follows l Check the line fuses Figure 2 6 as follows a Examine the LINE RATING label on the rear panel to make sure the correct voltage and fuses are indicated b Pull back on the lever...

Page 49: ...Newton meters 7 Position the safety cover over the fuses and secure the cover with the cover screws Torque the screws using 10 to 12 inch pounds 1 13 to 1 36 Newton meters 8 Place the metal cap into the opening of the safety cover that is not being used by the line cord 9 IMPORTANT To prevent the cable clamp from becoming loose attach the supplied cable mount to the side of the safety cover as sho...

Page 50: ......

Page 51: ... Figure 2 4 Verify that the fuse is as specified on the label Replace the fuse d Series 669xA Flip open the fuseholder located under the ac line safety cover on the rear panel Verify that the fuse is as specified on the label Replace the fuse 3 Check the sense wiring as follows a Series 664xA 665xA The SENSE switch 4 Figure 4 3a is set to Local b Series 667xA Remove the output safety cover 1 Figur...

Page 52: ...g 6 Press once The Dis annunciator will go off and the CV annunciator will go on Note If the power supply detects an error during self test the display will show an error message Go to In Case of Trouble at the end of this chapter Using the Keypad All Models Shifted Keys Some of the front panel keys perform two functions one labeled in black and the other in blue You access the blue function by fi...

Page 53: ...mber of millivolts change is determined by the voltage programming resolution of your power supply see Supplemental Characteristics in Chapter 1 Rotate Voltage control first counterclockwise and then clockwise Control operates similarly to and keys The control is rate sensitive Turning it more quickly causes a more rapid change in voltage Press 4 000 Program output to 4 volts Press Display shows d...

Page 54: ...alue This example assumes that you have an 8 volt supply see Performance Specifications in Chapter 1 for the value for your specific supply Meter mode Essentially zero outputs with Dis annunciator on Press VOLT 8 000 Program output to 8 volts Press AMPS 1 000 Program output to 1 ampere CAUTION Be certain to observe this step with Series 668xA 669xA supplies Start at 1 ampere before going to greate...

Page 55: ...f all other series have five locations 0 through 4 Proceed as follows Make certain that the output is on Dis annunciator is off Set the voltage output to 5 by pressing Save this value to location 1 by pressing Return the output voltage to 0 by pressing This step is based on the fact that a newly shipped power supply has the RST parameters stored in location 0 see Chapter 5 Front Panel for more inf...

Page 56: ...move the power supply dustcover as follows a Remove the four screws securing the carrying straps and dustcover b Spread the bottom rear of the dustcover and pull it back to disengage it from the front panel c Slide the dustcover back far enough to expose the line fuse l Figure 3 l 3 Observe the input rail LED under the RFI shield 4 Figure C 3 in Appendix C Line Voltage Conversion If the LED is on ...

Page 57: ... pin will extend out of the center of the fuse body see Figure 2 5 4 If one or two fuses are defective replace all three with fuses of the same type see Table 1 5 in Chapter l If all three fuses are blown the power supply probably has a defect that requires service Note When installing the fuses make sure that the fuse indicator pin located in the center of the fuse is facing OUT not IN 5 Replace ...

Page 58: ...by writing to the EEPROM while the power supply is in the calibration mode To do this proceed as follows 1 Enable the calibration mode by pressing 2 PASWD will appear on the display 3 Press the number keys corresponding to the password followed by The Cal annunciator will go on Note On new equipment the calibration password corresponds to the four digit model number such as See Appendix A Calibrat...

Page 59: ...ad wires must be capable of safely carrying the full rated current of the supply With the larger capacity supplies such as Series 668xA use of two or more load wires in parallel may be required Table 4 1 lists the characteristics of AWG American Wire Gauge copper wire Table 4 1 Stranded Copper Wire Capacity and Resistance AWG Ampacity l Resistance 2 AWG Ampacity 1 Resistance 2 No Ω Ω Ω Ω m No Ω Ω ...

Page 60: ...mon for VP and IM signals 1 S remote sense input S remote sense input NOTE 1 Referenced to output terminal Figure 4 1 Rear Panel Analog Connector Note It is good engineering practice to twist and shield all signal wires to and from the analog and digital connectors Digital Connector All Models This connector which is on the rear panel is for connecting fault inhibit digital I O or relay link signa...

Page 61: ...ng table for recommendations However large load capacitors may cause ringing in the supply s transient response It is possible that certain combinations of load capacitance equivalent series resistance and load lead inductance will result in instability 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 gu...

Page 62: ...apacitance see below L inductance of the load Rext equivalent series resistance of the load Rint model dependent internal resistance see below 6641A 6642A 6643A 6644A 6645A 6651A 6652A 6653A 6654A 6655A C 4 200 µF 550 µF 180 µF 68 µF 33 µF 10 000 µF 1100 µF 440 µF 120 µF 50 µF Rint 7 mΩ 30 mΩ 50 mΩ 125 mΩ 300 mΩ 4 mΩ 20 mΩ 30 mΩ 80 mΩ 250 mΩ Battery Charging The power supply s OVP circuit contains...

Page 63: ...rent Because the sense leads are part of the supply s feedback path keep the resistance of the sense leads at or below 0 5 Ω to maintain the above specified performance OVP Considerations The OVP circuit senses the voltage near the output terminals not at the sense terminals The voltage sensed by the OVP circuit can be significantly higher than the voltage being maintained at the load When using r...

Page 64: ...to the stability of the supply may be obtained by keeping the load capacitance as small as possible and by decreasing the load lead resistance by using larger diameter wires However if heavy gauge wire AWG 10 is used conditions may arise where the load lead inductance and load capacitance can form an undamped filter This can actually reduce the damping in the system and create a destabilizing phas...

Page 65: ...nal of the first slave supply is kept under 2 V at rated current This also applies to the voltage difference between the output terminals of the first and second slave supplies If remote sensing is required connect the load to the remote sense terminals of the master supply as shown by the dashed lines in Figure 4 3d Analog Connector Slave Supply Master Supply Program only the master Set slave out...

Page 66: ... models can withstand this current the higher current models in each series particularly the Agilent 6651A may be damaged in this situation Use any of the following operating techniques to avoid possible problems 1 Program Slave 2 OVP to the Maximum Level The following technique minimizes the chance that the slave 2 OVP circuit will trip a Program the OVP level of the master and of slave 1 to the ...

Page 67: ...age B Set switch for local or optional remote sensing C Connect for remote sensing optional WARNING FLOATING VOLTAGES MUST NOT EXCEED 240 VDC NO OUTPUT TERMINAL MAY BE MORE THAN 240 V FROM CHASSIS GROUND Figure 4 3f Series 664xA and 665xA Series Connection Remote Sensing Optional External Voltage Control The setup shown in Figure 4 3g allows an external dc voltage to program the power supply outpu...

Page 68: ... the output ratings will not damage the supply but it may not be able to regulate its output at the higher levels If this happens the Unr annunciator will light to warn you that the output is unregulated When voltage programming the output the frequency of the programming source is limited by the slew rate of the power supply To keep the power supply from slewing its output going into nonlinear op...

Page 69: ... of load capacitance equivalent series resistance and load lead inductance will result in instability If you need help in solving a stability problem contact a service engineer through your local Sales and Support Offices see end of this guide If the power supply output is rapidly programmed into capacitive loads the supply may momentarily cross into constant current CC mode This extends the CV pr...

Page 70: ...late its output at the output terminals not at the load Since local sensing does not compensate for voltage drops across screw terminals bus bars or load leads local sensing should only be used in applications that require low output current or where load regulation is not critical Local sensing is obtained by connecting the LS sense terminal to the S analog connector pin and the pin and the LS se...

Page 71: ...he supply s performance specifications are not guaranteed although typical performance may be good If the excessive demand on the supply forces it to lose regulation the Unr annunciator will indicate that the output is unregulated Output Noise Any noise picked up on the sense leads also appears at the output of the power supply and may adversely affect the load voltage regulation Be sure to twist ...

Page 72: ...igures Load Connection Load Analog Connector A Connect for remote sensing optional B Connect for local sensing default Figure 4 4c Series 667xA Single Load Connection Remote Sensing Optional Connecting One Power Supply To Multiple Loads Figure 4 4d shows how to connect a single power supply to more than one load When connecting multiple loads to the power supply with local sensing connect each loa...

Page 73: ...etween the output terminal of the master supply and the output terminal of the first slave supply is kept under 2 V at rated current This also applies to the voltage difference between the output terminals of the first and second slave supplies If remote sensing is required connect the load to the remote sense terminals of the master supply as shown by the dashed lines in Figure 4 4e Analog Connec...

Page 74: ... in Series Floating voltages must not exceed 240 Vdc No output terminal may be more than 240 V from chassis ground Figure 4 4f 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 vol...

Page 75: ...etween IP and P is 15 V Figure 4 4g Series 667xA Analog Programming Connections Programming Note from Figure 4 1 that you have three options for programming the current You can use a voltage source that is positive negative or floating with respect to Common P Do not exceed 19 V with respect to Common P Make certain that the common connection for your voltage programming source is isolated from th...

Page 76: ... is a low noise signal ground for convenience only It is not designed to function as a safety ground Load Considerations Capacitive Loads In most cases the power supply will maintain stability with external load capacitors However large load capacitors may cause ringing in the supply s transient response It s possible that certain combinations of load capacitance equivalent series resistance and l...

Page 77: ...ly be used in applications that require low output currents or where load regulation is not critical Note If the sense terminals are left open the voltage at the output bus bars will increase approximately 3 to 5 over the programmed value The readback voltage will not reflect this increase because readback is measured at the sense terminals Remote Voltage Sensing The dashed lines in the wiring dia...

Page 78: ...conductors Bundle or tie wrap the load leads to minimize inductance and reduce noise pickup Stability Using sensing under unusual combinations of load lead lengths and large load capacitances may cause your application to form a low pass filter which becomes part of the voltage feedback loop The extra phase shift created by this filter can degrade the supply s stability resulting in poor transient...

Page 79: ... a bench application requiring the Option 601 Output Connector Kit be sure to consult the instructions supplied with the kit Connecting One Power Supply to Multiple Loads Figure 4 5d shows how to connect a single power supply to more than one load When connecting multiple loads to the power supply with local sensing connect each load to the output bus bars with separate connecting wires This minim...

Page 80: ...rating voltage of the master supply This ensures that the slave supplies will operate in CC mode when tracking the output of the master supply Be sure to set the output current of the slave supplies to zero because all current programming inputs GPIB front panel and external voltage are additive Functions such as status voltage readback and current readback can still be read back individually for ...

Page 81: ...ix D Digital Port Functions for wiring information and Questionable Status Group in the Programming Guide for programming information Analog Connector Load Load Connection Program each supply for full load current and 1 2 the load voltage A Connect for remote sensing optional B Connect for local sensing default WARNING FLOATING VOLTAGES MUST NOT EXCEED 60 VDC NO OUTPUT TERMINAL MAY BE MORE THAN 60...

Page 82: ...nt 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 and 669xA Analog Programming Connections Programming Note from Figure 4 1 that you have three options for programming the current You can use a voltage source that is positive negative or floating with respect to Common P Do not exceed 15 V with respect to Common P Make c...

Page 83: ...ies with the Compatibility Language see the power supply Programming Guide 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 serial link cable Each li...

Page 84: ... Maximum total length of all GPIB cables including controller not to exceed 20 meters Use caution with individual lengths over 4 meters Maximum total length of all serial cables not to exceed 30 meters 1 2 3 NOTES A direct power supply is connected to the controller interface and must have a unique primary GPIB bus address The stand alone configuration uses only direct supplies connected to the co...

Page 85: ...ou also can calibrate the power supply from the front panel see Appendix A Getting Acquainted The front panel is summarized in Figure 5 1 and Table 5 1 Note that the panel is organized as follows LCD display including annunciators Output VOLTAGE and CURRENT rotary RPG knobs SYSTEM keypad FUNCTION keypad ENTRY keypad Power LINE switch Some keys have two functions For example the System key 3 Figure...

Page 86: ...has caused the power supply to shut down Press to determine the reason Err An error has been generated as a result of remote operation Press to display the error code Cal The power supply is in calibration mode Shift The shift key has been pressed Rmt The power supply is in the remote mode controlled over the GPIB Addr The power supply is addressed to listen or talk SRQ The power supply is request...

Page 87: ... power supply output This key toggles between the two states The disabled state programs the output to the RST voltage and current settings see the Programming Guide Press to display the output voltage setting After pressing you may use the ENTRY keys to change the value Press to display the output current setting After pressing you may use the ENTRY keys to change the value Press to display the O...

Page 88: ...re special considerations when you have two or more supplies connected in series or in autoparallel See Chapter 4 User Connections and Considerations The power supply accepts values directly in volts and amperes Values will be rounded off to the nearest multiple of the output resolution see Average Resolution in Table 1 2 of Chapter 1 If you attempt to enter a value not in a valid range the entry ...

Page 89: ...ement depending on the voltage programming resolution each time you press the key and increases rapidly as you hold down the key To lower the voltage press Try raising and lowering the voltage by rotating the Voltage control clockwise and then counterclockwise Note how the output responds as compared to using the Entry keys Try to program a voltage greater than the VMAX for your supply see Supplem...

Page 90: ...er supply current without a load but must have a load in order to draw output current These tests assume you have the load connected in accordance with the information in Chapter 4 User Connections and Considerations If you do not have a load on the power supply you may connect a short across the output terminals as described in Chapter 3 Turn on Checkout The example will program a low current You...

Page 91: ...lower the output current below the programmed current value or By raising the programmed current to a value above that required by the load Clear the fault by either of the above methods Then clear the OCP circuit by pressing The Prot annunciator will go off and the power supply output will be restored to normal If desired you can also restore the output by disabling the OCP function press to turn...

Page 92: ...OCP on OCP annunciator on Output off Dis annunciator on Save the above state to location 1 by pressing Now set up the following state Voltage 4 5 V Current 2 5 A OVP voltage 5 V OCP off OCP annunciator off Output on Dis annunciator off Save the above state to location 2 by pressing Restore the first state by pressing and verify the parameters Restore the second state by pressing Note how the power...

Page 93: ...y It has a unique secondary address that can be from l to 15 It is entered as an integer preceded by a decimal separator For example l or 12 When you enter a secondary address leading zeros between the decimal separator and the first digit are ignored For example 1 01 and 001 are accepted as secondary address 1 and displayed as 0 01 Zeros following a digit are not ignored Thus 10 and 010 are both ...

Page 94: ......

Page 95: ...54A 55A 15 A 0 1 Ω 0 04 25 W Guildline 9230 15 Agilent 6671A 300 A 0 001 Ω 0 04 100 W Guildline 9230 300 Agilent 6672A 73A 74A 75A 300 A 0 001 Ω 0 04 100 W Guildline 9230 300 Agilent 6680A 81A 6690A 1000 A 0 1 mΩ 0 05 Burster 1280S Agilent 6682A 83A 84A 6691A 92A 300 A 0 001 Ω 0 04 100 W Guildline 9230 300 For Calibration Over the GPIB GPIB Controller IBM compatible PC with GPIB Interface General ...

Page 96: ...ration values Saving the Calibration Constants Storing calibration constants overwrites the existing ones in nonvolatile memory If you are not absolutely sure you want to permanently store the new constants omit this step The power supply calibration will then remain unchanged To replace any existing calibration constants with ones you have just entered press CAL SAVED then appears on the display ...

Page 97: ...Calibration 97 Figure A 1 Calibration Test Setup c Series 668xA 669xA Setup ...

Page 98: ... out of acceptable range an error occurs Wait for the power supply to compute the new OVP calibration constants which will be stored in RAM Meter mode OVPCAL CAL COMPLETE NOT CV MODE DOES NOT CAL Entering Current Calibration Values 1 Make certain appropriate shunt resistor see Table A l is the only load on the power supply 2 Select the first calibration point by pressing If the power supply is not...

Page 99: ...eter mode CAL ERROR CAL COMPLETE CAL ERROR 4 Program the output voltage to 10 of its rated output See applicable Output Ratings in Chapter 1 General Information Recovering From Calibration Problems You can encounter serious calibration problems if you cannot determine a calibration password that has been changed or the power supply is severely out of calibration There are jumpers inside the power ...

Page 100: ...r during GPIB calibration are shown within this guide Table A 3 in Appendix A Calibration CAL CURR This command is used to calibrate the output current The command enters current value that you obtain from an external meter If you are entering the current value allow time for the DVM to stabilize You must first select a calibration level CAL CURR LEV for the value being entered Two successive valu...

Page 101: ...Commands CAL STAT CAL SAVE This command saves any new calibration constants after a current or voltage calibration procedure has been completed in nonvolatile memory Command Syntax CALibrate SAVE Parameters None Examples CAL SAVE Query Syntax None Related Commands CAL CURR CAL VOLT CAL STAT CAL STAT This command enables and disables the calibration mode The calibration mode must be enabled before ...

Page 102: ...Parameters CRD MINimum MAXimum Examples CAL VOLT LEV MIN CAL VOLT LEV MAX Query Syntax None Related Commands CAL VOLT DATA CAL STAT CAL VOLT PROT This command calibrates the power supply overvoltage protection OV circuit The output voltage must be in calibration before this procedure is performed Also the power supply output must be enabled and operating in the constant voltage CV mode If present ...

Page 103: ...T ENTER VOLTAGE MEASUREMENT FROM EXTERNAL VOLTMETER Volt_read 280 OUTPUT Ps CAL VOLTAGE Volt_read 290 OUTPUT Ps CAL VOLTAGE LEVEL MAX 300 INPUT ENTER VOLTAGE MEASUREMENT FROM EXTERNAL VOLTMETER Volt_read 310 OUTPUT Ps CAL VOLTAGE Volt_read 320 330 Calibrate overvoltage protection circuit 340 350 OUTPUT Ps CAL VOLTAGE PROTECTION 360 370 GOSUB Save_cal 380 IF Err_found THEN 390 INPUT ERRORS have occ...

Page 104: ...l 710 OUTPUT Ps CAL CURRENT Current 720 OUTPUT Ps CAL CURRENT LEVEL MAX 730 INPUT ENTER VOLTAGE MEASUREMENT FROM EXTERNAL VOLTMETER Volt_read 740 Current Volt_read Shunt_val 750 OUTPUT Ps CAL CURRENT Current 760 GOSUB Save_cal 770 IF Err_found THEN 780 INPUT ERRORS have occurred REPEAT CURRENT CALIBRATION Y 0R N Resp 790 IF TRIM UPC Resp l 1 Y THEN GOTO Volt_cal 800 END IF 810 IF Err_found THEN 82...

Page 105: ...ltmeter Resolution 10 nV 1 V Readout 8 1 2 digits Accuracy 20 ppm Agilent 3458A 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 Guildline 9230 15 Agilent 6671A 300 A 0 001 Ω 0 04 100 W Guildline 9230 300 Agilent 6672A 73A 74A 75A l00 A 0 001 Ω 0 04 100 W Guildline 9230 100 Agilent 6680A 81A 6690A 1...

Page 106: ...Operation Verification 106 Figure B 1 Verification Test Setup c Series 668xA 669xA Setup ...

Page 107: ...Note The power supply must pass turn on selftest before you can proceed with these tests Voltage Programming and Readback Accuracy This test verifies that the voltage programming GPIB readback and front panel display functions are within specifications Figure B 1 shows the setup for the tests Measure the dc output voltage directly at the sense connections of the output terminals or bus bars Connec...

Page 108: ... volts and 0 amperes 4 Disable the output WARNING ENERGY HAZARD for Series 668xA 669xA The power supply 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 5 Enable the output or OUTP ON 6 Observe the DVM voltage reading Divide this by the res...

Page 109: ...________ mA Iout 9 1 mA 20 µA High Current 10 A Iout 9 972 A ____________ A 10 028 A 3 1 mA Front Panel Display Readback Iout 24 1 mA ____________ mA Iout 24 1 mA 3 1 mA MODEL Agilent 6643A Voltage Programming and Readback Low Voltage 0 V Vout 15 mV ____________ mV 15 mV 2 0 µV Front Panel Display Readback Vout 25 mV ____________ mV Vout 25 mV 2 0 µV High Voltage 35 V Vout 34 964 V _____________V ...

Page 110: ...80 mV ____________ mV Vout 80 mV 2 0 µV High Voltage 120 V Vout 119 877 V _____________V 120 123 V 1 7 mV Front Panel Display Readback Vout 164 mV ____________ mV Vout 164 mV 1 7 mV Current Programming and Readback Low Current 0 A Iout 1 7 mA ____________ mA 1 7 mA 16 µA Front Panel Display Readback Iout 1 3 mA ____________ mA Iout 1 3 mA 16 µA High Current 1 5 A Iout 1 496 A ____________ A 1 504 ...

Page 111: ...________ mA Iout 26 mA 153 µA High Current 25 A Iout 24 937 A ____________ A 25 063 A 3 5 mA Front Panel Display Readback Iout 63 5 mA ____________ mA Iout 63 5 mA 3 5 mA MODEL Agilent 6653A Voltage Programming and Readback Low Voltage 0 V Vout 15 mV ____________ mV 15 mV 2 0 µV Front Panel Display Readback Vout 25 mV ____________ mV Vout 25 mV 2 0 µV High Voltage 35 V Vout 34 964 V _____________V...

Page 112: ...k Vout 80 mV ____________ mV Vout 80 mV 2 0 µV High Voltage 120 V Vout 119 877 V _____________V 120 123 V 1 7 mV Front Panel Display Readback Vout 164 mV ____________ mV Vout 164 mV 1 7 mV Current Programming and Readback Low Current 0 A Iout 4 mA ____________ mA 4 mA 15 µA Front Panel Display Readback Iout 3 mA ____________ mA Iout 3 mA 15 µA High Current 4 A Iout 3 990A ____________ A 4 010 A 58...

Page 113: ...mA ____________ mA Iout 100 mA 40 µA High Current 100 A Iout 99 84 A ____________ A 100 16 A 41 mA Front Panel Display Readback Iout 200 mA ____________ mA Iout 200 mA 41 mA MODEL Agilent 6673A Voltage Programming and Readback Low Voltage 0 V Vout 35 mV ____________ mV 35 mV 2 0 µV Front Panel Display Readback Vout 50 mV ____________ mV Vout 50 mV 2 0 µV High Voltage 35 V Vout 34 951 V ___________...

Page 114: ...ut 180 mV ____________ mV Vout 180 mV 3 0 µV High Voltage 120 V Vout 119 832 V _____________V 120 168 V 1 7 mV Front Panel Display Readback Vout 240 mV ____________ mV Vout 240 mV 1 7 mV Current Programming and Readback Low Current 0 A Iout 12 mA ____________ mA 12 mA 20 µA Front Panel Display Readback Iout 18 mA ____________ mA Iout 18 mA 20 µA High Current 18 A Iout 17 97 A ____________ A 18 03 ...

Page 115: ..._____ mA Iout 400 mA 15 mA High Current 580 A Iout 579 12 A ____________ A 580 88 A 311 mA Front Panel Display Readback Iout 980 mA ____________ mA Iout 980 mA 311 mA MODEL Agilent 6682A Voltage Programming and Readback Low Voltage 0 V Vout 21 mV ____________ mV 21 mV 1 7 µV Front Panel Display Readback Vout 32 mV ____________ mV Vout 32 mV 1 7 µV High Voltage 21 V Vout 20 970 V _____________V 21 ...

Page 116: ...60 mV ____________ mV Vout 60 mV 2 0 µV High Voltage 40 V Vout 39 944 V _____________V 40 056 V 590 µV Front Panel Display Readback Vout 80 mV ____________ mV Vout 80 mV 590 µV Current Programming and Readback Low Current 0 A Iout 65 mA ____________ mA 65 mA 1 5 mA Front Panel Display Readback Iout 90 mA ____________ mA Iout 90 mA 1 5 mA High Current 128 A Iout 127 807 A ____________ A 128 193 A 2...

Page 117: ...45 mV ____________ mV Vout 45 mV 1 0 µV High Voltage 30 V Vout 29 958 V _____________V 30 042 V 88 µV Front Panel Display Readback Vout 60 mV ____________ mV Vout 60 mV 88 µV Current Programming and Readback Low Current 0 A Iout 0 125 A ____________ A 0 125 A 15 mA Front Panel Display Readback Iout 165 mA ____________ mA Iout 165 mA 15 mA High Current 220 A Iout 219 655 ____________ A 220 345 A 31...

Page 118: ......

Page 119: ... and outer cover 3 Slightly spread the bottom rear of the cover and pull it back to disengage it from the front panel 4 Slide the dustcover back far enough to expose the select switches see Figure C 1 or the line select jumpers see Figure C 2 5 On the Series 664xA supply move the line voltage select switches to the positions corresponding to the desired line voltage 6 On the Series 665xA supply mo...

Page 120: ...engage it from the front panel 4 Slide the dustcover back far enough to expose the line select switch see Figure C 3 5 Observe the input rail LED under the RFI shield If the LED is on there is still hazardous voltage inside the supply Wait until the LED goes out this may take several minutes before proceeding 6 Connect a dc voltmeter across test points TP1 and TP2 It may be necessary to remove the...

Page 121: ...inner cover see Figure C 4 If the LEDs are on there is still hazardous voltage inside the supply Wait until they both go out this may take several minutes before proceeding If one LED remains on while the other goes out the power supply probably has a defect that requires service If you cannot see the LEDs through the hole in the inner cover then wait until power has been removed for at least 15 m...

Page 122: ...122 Line Voltage Conversion Figure C 4 Removing the Series 668xA 669xA Inner Cover Figure C 5 Series 668xA 669xA Line Conversion Jumpers ...

Page 123: ... finished making all connections plug the wired plug back into the connector FLT Output pins 1 and 2 Used to indicate that a fault has occurred in power supply Pins 1 and 2 are the open collector output of an optocoupler with pin 1 the collector and pin 2 the emitter When a fault has occurred pin 1 is driven low with respect to pin 2 negative true INH Input pin 3 Used to shut down the power supply...

Page 124: ...d to physically disconnect the output of the power supply from the load The FLT output is generated by the logical ORing of the power supply s Operation Questionable and Event status summary bits see Chapter 4 Status Reporting in the Programming Guide You can cause one or more events to activate the FLT output by enabling the appropriate events in these status registers The fault condition is clea...

Page 125: ...Digital Port Functions 125 GPIB GPIB GPIB Figure D 3 Examples of FLT Outputs Figure D 4 Digital Port Configuration Jumper ...

Page 126: ...d 5 Refer to Figure D 4 and use needle nose pliers to move the jumper to the Digital I O position 6 Replace the outer cover and secure the carrying straps 7 Make the necessary wire connections to the digital connector Digital I O Operation The digital port can be configured see Figure D 4 to provide a digital input output to be used with custom digital interface circuits or relay circuits Some exa...

Page 127: ...3 Receives the data readback that indicates the status of the relays in the Relay Accessory Common pin 4 Common connection for the RLY SEND and RLY RTN lines Figure D 6 shows how to connect your power supply to an Agilent 59510A or 59511A Relay Accessory when the digital port is configured for relay link operation An error will be generated if you attempt to program the relay box without first con...

Page 128: ......

Page 129: ...fast CV CC crossover performance for load inductances that are specific for each model For Models 6680A and 6681A this curve ranges from 100 µohms at 15 µhenries to about 100 milliohms at 40 millihenries You can select a different compensation curve by opening a specific switch or combination of switches Table E 1 shows some specific L R ratios and the switch positions required for these ratios Ta...

Page 130: ...ore overshoot To obtain better operation at point use the compensation curve defined by switch setting 13 Model 6680A or 12 Model 6681A Most operating conditions will not fall directly on a curve and you will have to interpolate between curves Generally moving to the left of a given curve increases stability However at large values of inductance the curves become almost vertical because the load r...

Page 131: ...Current Loop Compensation Series 668xA Only 131 Figure E 1 CC Loop Compensation Curves For Models 6682A and 6683A ...

Page 132: ...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 2 Remove the four screws that secure the two carrying straps and outside cover 3 Spread the bottom rear of the cover and pull it back to disengage it from the front panel 4 Remove the cover by sliding it back towards the rear of the supply 5 Locate the compensation switch see...

Page 133: ...t 2 volts higher than the output voltage that the master supply will be programmed to 6 Program the master supply s output current for a value slightly greater than one half of the total desired output current if there is one slave supply or one third of the total desired output current if there are two slave supplies 7 Enable all power supplies by pressing the Output On Off key 8 Increase the mas...

Page 134: ... power supplies have an output current programmed at power on The default current value programmed at power on can be found in Table 3 1 of the Programming Guide p n 5964 8269 See RST and SAV in the Programming Guide to change the power on current value Note 3 A current programmed via the rear panel Ip or Ip inputs will be summed with the current programmed via the front panel keypad or over the G...

Page 135: ... the required hardware for attaching the spacers to the and bus bars The spacers have tapped holes for receiving the screws that are inserted through clearence holes in the bus bars Either spacer may be used with either bus bar Secure the spacers on opposite sides of the bus bars as shown in the figure Be sure to insert the flatwashers and lockwashers When the spacers have been installed connect t...

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Page 137: ... 667xA 69 668xA and 669xA 76 CC loop compensation 668xA 129 curves 130 CC mode 91 129 130 characteristics 664xA 17 665xA 22 667xA 27 668xA 32 669xA 37 output 15 checkout 51 output current 54 output voltage 53 power on 52 preliminary 51 common commands See Programming Guide common P 60 68 75 82 Compatibility language See Programming Guide connections 664xA and 665xA in parallel 65 664xA and 665xA i...

Page 138: ... 667xA 45 56 668xA 47 57 669xA 48 57 kit 13 power 41 fuse indicator window 669xA 57 G general information 11 GPIB address 55 93 address primary 83 93 address secondary 83 93 GPIB system supplies 13 ground earth 12 46 47 49 signal 123 Guide Operating 11 Guide Programming 11 Guide Service 13 H hardware 41 history 4 I inductive load 664xA and 665xA 62 667xA 69 668xA 129 668xA and 669xA 77 INH input 1...

Page 139: ...See Performance specifications errors See Programming Guide parameters See Programming Guide resolution See characteristics Programming Guide 11 Protect key See front panel keys R rack mount kit 12 44 rack mounting 44 recalling states 55 92 relay link connections 127 pin configuration 127 remote programming 14 remote voltage sensing and 664xA and 665xA load regulation 63 and 664xA and 665xA output...

Page 140: ...nregulated operation 92 664xA and 665xA 63 667xA 71 V verification 105 current monitor resistor 105 current programming and readback 108 equipment required 105 test parameters for 664xA 109 test parameters for 665xA 111 test parameters for 667xA 113 test parameters for 668xA 115 test parameters for 669xA 117 test setup 106 voltage programming and readback 107 verification tests 51 voltage control ...

Page 141: ...67 4245 fax 305 267 4286 Canada Agilent Technologies Canada Inc 5150 Spectrum Way Mississauga Ontario L4W 5G1 tel 1 877 894 4414 Australia New Zealand Agilent Technologies Australia Pty Ltd 347 Burwood Highway Forest Hill Victoria 3131 tel 1 800 629 485 Australia fax 61 3 9272 0749 tel 0 800 738 378 New Zealand fax 64 4 802 6881 Europe Agilent Technologies Test Measurement European Marketing Organ...

Page 142: ... added to the specifications on pages 16 and 21 The Declarations of Conformity for all models have been updated 1 24 05 The ac input ratings information for Series 667xA 668xA and 669xA has been updated 1 26 07 The power cord installation procedure for Series 669xA has been updated Line cord Option 841 is deleted A typo has been fixed on the transient response spec for Series 667xA 9 02 09 A URL h...

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