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1. OUTPUT IMPEDANCE OHMS 100 1K 10K 100K 1M FREQUENCY 4Hz Agilent 6544A CV MODE CC MODE GSIXIMPO GAL 100 1K 0K 100K 1M FREQUENCY HD Agilent 6545A General Information 19 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table 1 1b Supplemental Characteristics for Series 654xA and 655xA continued Agilent Model Number and Parameter Value Output Impedance Curves Typical OUTPUT IMPEDANCE OHMS OUTPUT IMPEDANCE OHMS OUTPUT IMPEDANCE OHMS OUTPUT IMPEDANCE OHMS 655XIMPD GAL OUTPUT IMPEDANCE OHMS Agilent 6555A 20 General Information Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table 1 2a Performance Specifications for Series 657xA Parameter Agilent Agilent 6572A Agilent 6573A Agilent 6574A Agilent 6571A 6575A Specifications are warranted over the temperature range 0 to 55 C with a resistive load and the output connected for local sensing Output Ratings Voltage Current Front Panel Programming Accuracy 25 C 5 C Voltage 0 04 8 mV 0 04 20 mV 0 04 35 mV 0 04 60 mV 0 04 120 mV Current 0 11 125 mA 0 11 60 mA 0 11 40 mA 0 11 25 mA 0 11 12 mA Ripple amp Noise from 20 Hz to 20 MHz with outputs ungrounded or with either output
2. Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com rtisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Calibration Introduction The power supply may be calibrated from the front panel The procedures given here apply to all models Im portant These instructions do not include verification procedures If you require verification as part of your calibration procedure refer to the appropriate service manual see Table 1 3 in Chapter 1 Equipment The equipment listed in Table A 1 or equivalent is required for calibration Table A 1 Equipment Required for Calibration Equipment Characteristics Recommended Model Shunt Resistor Agilent 6541A 0 01 Q 0 04 100 A 100 W Guildline 9230 100 Agilent 6542A 43A 44A 45A 0 1 Q 0 04 15 A 100 W Guildline 9230 15 Agilent 6551A 52A 0 01 Q 0 04 100 A 100 W Guildline 9230 100 Agilent 6553A 54A 55A 0 1 Q 0 04 15 A 100 W Guildline 9230 15 Agilent 6571A 0 001 Q 0 04 300 A 100 W Guildline 9230 300 Agilent 6572A 73A 74A 75A 0 01 Q 0 04 100 A 100 W Guildline 9230 100 General Procedure Because the power supply output must be enabled during calibration voltages or currents hazardous to personnel and or dangerous to equipment can appear at the output terminals Parameters Calibrated You can calibrate the voltage output and readback the current output and
3. Enabling the Calibration Mode 1 Begin calibration by pressing Cal Enable 2 Enter calibration password from Entry keypad If password is correct the Cal annunciator will come on If password is incorrect an error occurs Note The initial factory default password is the model number of the power supply but it can be changed see Changing the Password Entering Voltage Calibration Values 1 Make certain the DVM is the only load on the power supply 2 Select the first calibration point by pressing If the power supply is not in CV mode an error occurs 3 Read the DVM and use the Entry keypad to enter the first voltage value 4 Select the second calibration point by pressing again 5 Read the DVM and use the Entry keypad to enter the second voltage value Note If one of the entered values is not within acceptable range an error occurs The power supply is now holding the new voltage calibration constants in RAM Calibrating the OVP Trip Point 1 Make certain the voltage has been calibrated and there is no load on the power supply 2 Select OVP calibration by pressing 3 3 Wait for the power supply to compute the OVP calibration constant If the supply goes unregulated or into CC mode during OVP calibration an error occurs If the computed constant is out of acceptable range an error occurs The power supply is now holding the new OVP calibration constant in RAM Entering Current Calibration Values 1 Make certain ap
4. d 2240 VOC MAX Se rwuamuss SENSE to TOLL O i LU k E ni 1 i FIG4 2 GM OUTPUT SAFETY COVER f6 OUTPUT BUS BAR ANALOG CONNECTOR OUTPUT SIGNAL GROUND 3 OUTPUT BUS BAR 8 REAR KNOCKOUTS KJ LOCAL SENSE TERMINAL BOTTOM KNOCKOUT LOCAL SENSE TERMINAL 10 LOCAL SENSE JUMPERS INSERT WIRES FROM 22 AWG TO 12 AWG TIGHTEN SCREWS INSERT SCREWDRIVER BLADE IN SLOT AND PRY OUT 99 Figure 4 2 Series 657xA Rear Panel Connections BEND ALONG JOINT AND BREAK OFF The connector accepts wire sizes from AWG 22 to AWG 12 The purpose of each analog pin is described in Table 4 1 Note 40 In addition to specific wiring instructions given in this chapter it is good engineering practice to twist and shield all signal wires to and from the analog connector User Connections and Considerations Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table 4 1 Analog Connector Functions Pin IP Series 654xA and 655xA Current programming Input Allows an external voltage source to program CC constant current mode CC is programmed with a 0 to 5 V signal that produces proportional output current from zero to full scale The IP input is also used for auto parallel operation as described later in this chapter IP Series 657xA Differential Current Programming Input Allows an external voltage source to program CC c
5. A rtisan Artisan Technology Group is your source for quality Technology op new and certified used pre owned equipment FAST SHIPPING AND SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT DELIVERY Experienced engineers and technicians on staff Sell your excess underutilized and idle used equipment TENS OF THOUSANDS OF at our full service in house repair center We also offer credit for buy backs and trade ins IN STOCK ITEMS www artisantg com WeBuyEquipment EQUIPMENT DEMOS HUNDREDS OF InstraV ea REMOTE INSPECTION LOOKING FOR MORE INFORMATION MANUFACTURERS Remotely inspect equipment before purchasing with Visit us on the web at www artisantg com 7 for more our interactive website at www instraview com information on price quotations drivers technical LEASING MONTHLY specifications manuals and documentation RENTALS ITAR CERTIFIED EE Contact us 888 88 SOURCE sales artisantg com www artisantg com OPERATING MANUAL Analog Programmable DC POWER SUPPLIES Agilent Technologies Series 654xA 655xA 657xA Agilent Technologies Agilent Part No 5959 3374 Printed in Malaysia Microfiche Part No 5959 3375 Reprinted April 2000 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com CERTIFICATION Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory Agilent Technologies further certifies that
6. Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Note Under certain conditions the OCP circuit may fail to clear because load demand occurs before the power supply has time to build up the required output current capacity In such cases disable the output press before clearing the OCP circuit After OCP is cleared enable the power supply output Unregulated Operation If the power supply goes into a mode of operation that is neither CV nor CC the Unr annunciator will come on An unregulated condition limits the output current to a value that is safe for the supply Some unregulated states occur so briefly that they do not turn on the Unr annunciator One condition that can cause a noticeable unregulated state is low ac line voltage Saving and Recalling Operating States Normal Operation You can save programming time by storing up to 5 power supply operating states in nonvolatile memory The programming parameters that are saved are e Output voltage Output current OVP voltage e OCP state on or off Output state enabled or disabled As an example set up the following state e Voltage 4V Current 1A OVP voltage 5 5 V e OCP on OCP annunciator on Output Off Dis annunciator on Save the above state to location by pressing Enter Now set up the following state e Voltage 8V Curent 15A OVP voltage 8 5 V e OCP off OCP annunciator off Output On Dis annunciator off Save the a
7. 6541A 6551A 6542A 6552A 6543A 6553A 1 mV 2 mV 3 mV Current 6541A 6542A 6543A 1 mA 0 5 mA 0 25 mA 6551A 6552A 6553A 2 mA 1 mA 0 5 mA Line Regulation change in output voltage or current for any line change within ratings Voltage 6541A 6551A 6542A 6552A 6543A 6553A 0 5 mV 0 5 mV 1 mV Current 6541A 6542A 6543A 1 mA 0 5 mA 0 25 mA 6551A 6552A 6553A 2 mA 1 mA 0 75 mA 14 General Information 6542A 6552A 0 07 15 mV 6542A 0 15 13 mA 6552A 0 15 26 mA 6542A 0 35 20 mA 6552A 0 35 44 mA 6543A 6553A 0 35 V 6543A 6553A 0 06 15 mV 6543 A 0 14 Yo 7mA 6553 A 0 15 13mA 6543A 6553A 400 uV 6543A 6553A 4mV 6543A 3mA 6553A 5 mA 6543A 6553A 0 07 25 mV 6543 A 0 15 6 7 mA 6553A 0 15 15 mA 6543A 0 35 12 mA 6553A 0 35 24 mA 6544A 6554A 0 60 V 6544A 0 35A 6554A 0 9A 6544A 6554A 0 06 26 mV 6544A 0 14 4mA 6554A 0 15 8mA 6544A 6554A 500 uV 6544A 6554A 5mV 6544A 1 5 mA 6554A 3mA 6544A 6554A 0 07 40 mV 6544A 0 15 4 1 mA 6554A 0 15 7 mA 6544A 0 35 6 8 mA 6554A 0 35 15 mA 6544A 6554A 4mV 6544A 0 25 mA 6554A 0 5 mA 6544A 6554A mV 6544A 0 25 mA 6554A 0 5 mA 6545A 6555A 0 120 V 6545A 0 15A 6555A 0 4A 6545A 6555A 0 06 51 mV 6545A 0 14 2mA 6555A 0 15 4mA 6545A 6555A 700 uV 6545A 6555A 7mV 6545A 1 mA 6555A 2 mA 6545A 6555A 0 07 80 mV 6545A 0 15 1 7 mA 6555A 0 15 3 mA 6545A 0 35 2 9 mA 6555A 0
8. Although some 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 Program Slave 2 OVP to the Maximum Level The following technique minimizes the chance that the slave 2 OVP circuit will trip 1 Program the OVP level of the master and of slave 1 to the desired protection level below the maximum level specified in Table 1 2b 2 Program the OV protection level of slave 2 to its maximum value Enable OCP on the Master You can do this if the combination of all three supplies is being used in the CV mode and the CC mode is only being used as a current limit Enable OCP on the master supply Ifthe OVP on either slave trips 1t will drive the master into CC mode thereby tripping its OCP This will shut down all three supplies This technique will work unless the system is programmed for very low 0 5 to 1 5 output voltages Insert Protection Diodes If you connect the slave 2 supply to the load through a series diode see Figure 4 7 its OVP circuit will not draw current from other supplies Be certain to increase the programmed CV level of slave 2 by at least 0 7 V to compensate for the voltage drop in the diode MASTER CV MODE SLAVE 1 CC MODE SLAVE 2 CC MODE xe A y cd Lc cen d Figure 4 7 Using Series Diodes with Series 654xA 655xA Auto Paral
9. Guaranteed 888 88 SOURCE www artisantg com default state see factory reset state CO WMPNO PLAINS pwosp kiye lokal akte sake ayi kad a ae ASG SRG cade Ee eA ee E 13 50 56 E EEPROM 37 ken 55 A 54 NN 37 error messages Calibration EE 66 NOG PUB EE 54 OL csetera dite ta e On ER ERE bre eR On e ier xd edem vere rere T 38 OUT OF RANGE ote ER Ee o eso iE dte te ut uiuo MM ert EE 56 57 ple ETE 37 PP A ILL MM IM eee eee pea oo 38 Au lm HET 37 exhaust fan oU DI IP RIED MIHI 28 external voltape Contro EE 41 49 F Tactorysreselt BEER EE IERI RII EIU EES 61 front panel controls and mdicatorg eene ee nee thnn asset neta nn sanis sensit reads sessi tete anas A nasa sans 12 54 PROSFAMMAN eer HEEN ENEE dE 13 32 33 56 57 58 59 fuse EE 25 27 28 31 35 36 G ground Te 42 49 EE 11 29 42 EE 42 H WEA KEE 25 27 l EE 65 TIM Le EE 41 impedance QUEUE GRA 19 20 24 poculi ii a dina 50 sent Le E 43 IA eet 56 70 Index Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com pi m n 41 50 TIP differential 41 US 42 51 d jumpers Calibration EE 65 line voltage SEISCHUON EE 68 A A ke ou
10. make sure it is of sufficient size to carry the supply s maximum output current see Table 4 2 in Chapter 4 for the appropriate wire size Perform the steps in Table 3 2 to check the basic current functions with a short across the power supply output The AMPS display will show various readings Ignore the VOLTS display Table 3 1 Checking the Voltage Functions Output Terminals Open If the Dis annunciator is on turn it off by pressing Press VOLT 0 000 Displays default output voltage CV annunciator is on If CC annunciator remains on increase the CC current setting by pressing 00 Press UU VOLT 20 Set voltage to supply s rated output Press 20 000 Meter mode displays output voltage Press several times Voltage drops about 5 millivolts each time you press the key Press the same number of Voltage increases about 5 millivolts each time you press the times key Rotate the Voltage control first Control operates similarly to the verage and keys counterclockwise and then clockwise Turning the controls more quickly causes a more rapid change in voltage Press OV 22 000 Shows the default OVP trip voltage Press 06 OV 15 Program OV trip voltage to 15 Press You have entered a trip voltage that is less than the output voltage The output drops to near zero The CV annunciator goes off and the Prot annunciator comes on Press OV Indicates the overvoltage Protection circuit has tripped Press Meter mode Press WOW OV
11. neye k Sa 64 Performing the EE 64 Entering the Calibration Values eeseeeeeeeeeeeeeeeeen eene eene ao saa saa teneret teen rode tren teen nennen 64 Saving the Calibration Constant nennen nnnm nn none none ike kn rer ESES eirese nEri Erik 64 Changing the Calibration Password 64 Disabling the Calibration Mode AAA 66 Calibration Error Messapes ticas 66 B Line Voltage Conversion Series 654xA and 655xA Power Supplies 67 Series ORA Nee D MR A ap ob nn bl ot on EN oak a EEEE vip ak ba NEEESE ven as on van ban si de 68 JE EE 69 AGILENT Sales and Support Office 5 ese ape Eed 75 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com rtisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com General Information Introduction This is the operating manual for your Agilent Series 654xA 655xA and 657xA power supplies Unless otherwise stated the information in this manual applies to all models in the series These supplies are the analog programmable counterparts of the Agilent Series 664xA 665xA and 667xA GPIB System power supplies 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 t
12. the power supply will remove its output Checking OCP Operation The easiest way to check this operation at any specified current is to place a short across the output If the supply is connected to an Agilent Electronic Load press its key The power supply output will then drop to zero and the Prot annunciator will come on There is now no power supply output due to an overcurrent condition To verify this press and observe that the display indicates 0C Clearing the OCP Condition With the OCP tripped return to the meter mode and try to clear the condition by pressing Prot Clear Nothing will appear to happen because the reason for the condition has not been removed Thus as soon as the circuit is cleared it trips again You can clear the OC condition by e increasing the load resistance to lower the output current below the programmed current value e orby raising the programmed current to a value above that required by the load In this example the easiest way to clear the OCP fault is by removing the short from across the output After doing this you clear the OVP 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 off the OCP annunciator This restores the output but does not clear any condition that may have caused OCP to trip Front Panel Operation 59 Artisan Technology Group
13. 21 Raise the OV trip voltage up above the programmed output voltage Press Enter the new trip voltage Press Protect You have cleared the OV protection fault The Prot annunciator goes off the CV annunciator comes on and the full rated output is restored Turn On Checkout 33 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table 3 1 Checking the Voltage Functions continued Maximum voltage values are for Agilent 6552A See Output Ratings in Performance Specifications of Chapter 1 for your specific model Voltage increments are for Agilent 6552A See Average Resolution in Supplemental Characteristics of Chapter 1 for your specific model OV voltage is for Agilent 6552A See Output Programming Range in Supplemental Characteristics of Chapter 1 for your specific model EE key is the unlabeled blue key Table 3 2 Checking the Current Functions Output Terminals Shorted Turn off the power supply and connect a wire across the output and terminals Use a wire of sufficient size to carry the maximum current of the supply see Performance Specifications in Chapter 1 Turn on the supply Meter mode Press Voltag D O O VOLT 1 500 Press Press Current several times Press the same number of times Rotate the Current control first clockwise and then counterclockwise Press Press OC Meter mode
14. 50 Programming Series 657xA Supplies 51 OVP ComsiGera 51 REMOS OO ta 51 Battery Chato PEE 51 Series 654xA and 655xA Load Capacitance ccoconoccocnnonnconocononononnnonanonnconn cnn conc cnn non arco eren eren enne 51 Front Panel Operation IMO AUCH ON E 53 Getting DE TO EE 53 Programming the Output ocarine einer des sato oe ET ore leere spo ab be nivo eio otis eo parey ad iron eege SEAN 56 InttodUCQn E 56 Establishing Initial Conditions eee entere tienen tnn nennen nin NoE repete ko ebbe area EEE EErEE EE E 56 Programme roc Vn 57 Programming CUMCN C 57 CV Mode ys CC MOde onem re SEE DR ERO A eee es aa E RU ES 58 Programming Overvoltage Protection essere een nennen eterne tree trennen tenens 58 Programming Overcurrent Protection sese retener nn nana tenente 59 Unregulated Operation M 60 Saving and Recalling Operating States eene nennen rene ener tenete 60 Normal Operations eiieeii EEE A S 60 T rr ON O peral ciclista i 60 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table of Contents continued A Calibration lion visita iia ide jape koi ba 63 EQUIPO iii ibas iia 63 General Procedure su ia 63 Parameters Calibrated C ars 63 Equipment COMMECHONS M
15. Guaranteed 888 88 SOURCE www artisantg com rtisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Front Panel Operation Introduction This chapter shows you how to operate the front panel It is assumed that you are familiar with the turn on checkout procedure in Chapter 3 That chapter describes how to perform basic power supply functions from the control panel Operations that you can perform are Enabling or disabling the power supply output Setting the output voltage and current Monitoring the output voltage and current Setting the overvoltage protection OVP trip point Enabling the overcurrent protection OCP circuit Saving up to 5 operating states in nonvolatile memory Recalling up to 5 operating states from nonvolatile memory Note You also can calibrate the power supply from the front panel see Appendix A Getting Acquainted The front panel is summarized in Figure 5 1 Note that the panel is organized as follows O LCD display including annunciators Output VOLTAGE and CURRENT rotary RPG controls G SYSTEM keys G FUNCTION keys 6 ENTRY keys Power On Off LINE switch Some keys perform two operations The first operation is shown on the key and the second shifted operation is shown in blue above the key In order to do a shifted operation first press the solid blue key which is unlabeled but shown throughout this manual as For example for a
16. Guaranteed 888 88 SOURCE www artisantg com Table 1 1b Supplemental Characteristics for Series 654xA and 655xA continued Dimensions Series 654xA Series 655xA Width 425 5 mm 16 75 in 425 5 mm 16 75 in Height 88 1 mm 3 5 in 132 6 mm 5 22 in Depth 439 mm 17 3 in 497 8 mm 19 6 in Weight Series 654xA Series 655xA Net 14 2 kg 31 4 Ib 25 kg 54 Ib Shipping 16 3 kg 36 lb 28 kg 61 Ib Output Characteristic Curve Vout Maximum Rated Output CV Operating Line Agilent q Model l 6552A 20V CC Operating Line 6553A 35 y 60 V 6555A 120 V lout Is lmax 18 General Information Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table 1 1b Supplemental Characteristics for Series 654xA and 655xA continued Agilent Model Number and Parameter Value Output Impedance Agilent 654xA Typical O MODE GC MODE 8 OUTPUT IMPEDANCE OHMS o 2 l 100 1K 10K 100K 1M FREQUENCY 63z Agilent 6541A CV MODE CC MODE Vn 7 a E 1 e w o a 0 1 K 2 0 01 E o 9 001 106 1K 10K 00K 1M FREQUENCY H2 Agilent 6543A 100 3 0 1 OUTPUT IMPEDANCE OHMS CV MODE e CC MODE OUTPUT IMPEDANCE OHMS 190 1K 10K 100K 1M FREQUENCY 042 Agilent 6542A CN MODE GC MODE
17. Oto 6 81 V 0 to 6 81 V Oto 7 01 V 0 to 6 34 V Input Input Impedance VP Input IP Input Signal source must be isolated Referenced to output signal common Current Monitor IM Output Signal 0 25 to 9 05V 0 25 to 47 7 V 0 25to 7 7V_ 0 25 to 7 93V Output Impedance 490 Q Corresponds to 0 to 100 output current Savable States 5 Nonvolatile Memory Locations Nonvolatile Memory Write Cycles 60 KQ 52 KQ 0 25 to 7 15V 5 0 through 4 40 000 typical Recommended Calibration Interval 1 year Safety Compliance Complies with CSA 22 2 No 231 amp IEC 348 Designed to comply with UL 1244 amp VDE 0411 RFI Suppression complies with FTZ 1046 84 Level B Dimensions Width 425 5 mm 16 75 in Height 132 6 mm 5 22 in Depth w safety cover 640 mm 25 2 in Weight Net 27 7 kg 61 lb Shipping 31 4 kg 69 Ib Output Characteristic Curve Vout Maximum Rated Output Agilent D Botte igilen A E CEN 6571A 6572A 6573A 6574A 6575A men CC Operating Line Iout General Information 23 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table 1 2b Supplemental Characteristics for Series 665xA continued Agilent 6572A Agilent 6573A Agilent 6574A Agilent 6575A 6571A Output Impedance Curves Agilent 657xA Typical
18. The display will change from meter mode to indicate VOLTS B Press 4 O 5 Enter If you discover a mistake before pressing Enter erase the incorrect value with the backspace key 2 M The display will return to the meter mode and indicate 4 5000 volts Note The power supply must be programmed for a minimal current in order to increase the output voltage beyond zero Normally there is sufficient current to do this If the power supply does not respond or the Unr annunciator comes on go to Programming Current and set the current to a small value Now raise the voltage by pressing or rotating the Voltage control clockwise Note that the voltage increases by a specific increment depending on the voltage resolution each time you press the key and increases rapidly as you hold down the key To lower the voltage press or rotate the Voltage control counterclockwise Try to program a voltage greater than the Vmax for your supply Note that the display shows OUT OF RANGE Programming Current Note You may program the power supply current without a load but must have a load in order to draw output current If you do not have a load on the power supply you may connect a short across the output terminals for this procedure Turn the power supply off before making any connections To program the output current to 1 3 amperes proceed as follows M Make certain that the voltage is not programmed to zero B Press Current The display will
19. bak PAS SREF Saa De 27 switch line VOL FACE a picos 67 68 SONSO we 31 40 44 45 T turn on state FACLOLY EE 61 recie A Adra 60 U unregulated OUT PUL cue M Pie 60 V AAA n k ena 65 vernficatior DEE 31 63 VOLTAGE control E 12 32 54 57 O 55 Voltage J Voltage SN 33 55 57 58 biup 41 50 W EE 41 Index 73 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com rtisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Agilent Sales and Support Office For more information about Agilent Technologies test and measurement products applications services and for a current sales office listing visit our web site http www agilent com find tmdir You can also contact one of the following centers and ask for a test and measurement sales representative United States Agilent Technologies Test and Measurement Call Center P O Box 4026 Englewood CO 80155 4026 tel 1 800 452 4844 Canada Agilent Technologies Canada Inc 5150 Spectrum Way Mississauga Ontario L4W 5G1 tel 1 877 894 4414 Europe Agilent Technologies Test amp Measurement European Marketing Organisation P O Box 999 1180 AZ Amstelveen The Netherlands tel 31 20 547 99
20. change from meter mode to indicate AMPS Front Panel Operation 57 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com B Press O 3 Enter If you discover a mistake before pressing Enter erase the incorrect value with the backspace key M The display will return to the meter mode and indicate up to 1 3000 amperes depending upon the load Now raise the current by pressing Current or rotating the Current control clockwise Note that the current increases by a specific increment depending on the current resolution each time you press the key and increases rapidly as you hold down the key To lower the current press rotate the Current control counterclockwise Try to program a current greater than the IMAX for your supply Note that the display shows OUT OF RANGE CV Mode vs CC Mode Once you program a voltage V and a current I the power supply will try to maintain itself in either CV or CC mode depending on the resistance of the load R If the load demands less current than I operation will be in CV mode with the voltage maintained at V The output current will be at some value below Is as determined by V Ri For an Agilent 6552A supply Imax 25 594 amperes and Vmax 20 475 volts If you program the output for x25 amperes at 20 volts the supply will operate in the CV mode for all resistances gt 0 8 ohms This represents the operating resistance shown as R C
21. fuse to correspond to the new line voltage setting If you need a different power cord contact your nearest Agilent Sales and Support Office Proceed as follows 1 Turn off the ac power and disconnect the power cord 2 Remove the four screws securing the carrying straps and dustcover 3 Slide the dustcover back far enough to expose the line select switches see Figure B l or the line select jumpers see Figure B 2 4 Ona Series 654xA supply move the line select switches to the positions corresponding to the desired voltage see Figure B 1 5 Ona Series 655xA supply move the line select jumpers to the positions corresponding to the desired voltage see Figure B 2 To disconnect it from the transformer tab pull the wire straight up Do not wiggle the wire from side to side as this can damage the tab 6 Replace the top cover and secure the carrying straps 7 Change the line fuse on the rear panel to the proper value for the new line voltage setting see Table 1 3 in Chapter 1 AC LINE VOLTAGE SELECTION 100v we mm ENCON 220v m a cov mj FRONT Figure B 1 Series 654xA Line Select Switches Line Voltage Conversion 67 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Series 657xA Power Supplies Power supply top view cover removed Transformer Front Panel Indicates a jumper Grey White Red Grey I hi
22. in Figure 5 2 The supply will vary the output current to maintain a constant voltage of 25 volts If the load resistance is lt 0 8 ohms the supply will vary its output voltage to maintain a constant current output of 25 amperes However if you reprogram the output voltage to a lower value Vs see Figure 5 2 then the supply will again be able to maintain CV operation with the lesser load resistance such as R B in Figure 5 2 Programming Overvoltage Protection Overvoltage protection guards the load against voltages that reach a specified value above the programmed output voltage Setting the OVP Level Assuming that a power supply is programmed for 10 volts you can set the OVP level to 11 5 volts as follows Press ov The display will change from meter mode to indicate OV followed by the present OVP value Press O 5 Enter The display will return to the meter mode and indicate the output 10 000 volts Press again The display will now indicate 0V 11 500 Press to return to the meter mode Checking OVP Operation Assuming the above operating conditions trip the OVP circuit as follows e Raise the output voltage close to the trip point such as 11 0 e 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 e There now is no power supply output due to an overvoltage condition e To verify this press and observe th
23. 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 calibration facilities of other International Standards Organization members WARRANTY This Agilent Technologies hardware product is warranted against defects in material and workmanship for a period of three years from date of delivery Agilent Technologies software and firmware products which are designated by Agilent Technologies for use with a hardware product and when properly installed on that hardware product are warranted not to fail to execute their programming instructions due to defects in material and workmanship for a period of 90 days from date of delivery During the warranty period Agilent Technologies will at its option either repair or replace products which prove to be defective Agilent Technologies does not warrant that the operation of the software firmware or hardware shall be uninterrupted or error free For warranty service with the exception of warranty options this product must be returned to a service facility designated by Agilent Technologies Customer shall prepay shipping charges by and shall pay all duty and taxes for products returned to Agilent Technologies for warranty service Except for products returned to Customer from another country Agilent Technologies shall pay for return of products to Customer Warranty services outside the country of i
24. mV 6541A 7 6 18 mA 6551A 7 75 mA 6541A 7 6 65 mA 6551A 7 730 mA 6542A 6552A 20 475 V 6542A 6552A 22 0 V 6542A 10 237 A 6552A 25 594 A 6542A 6552A 5mV 6542A 3 mA 6552A 7mA 6542A 6552A 30 mV 6542A 6552A 400 mV 6542A 6552A 0 26 15 mV 6542A 7 6 9 2 mA 6552A 790 31 mA 6542A 7 6 32 mA 6552A 7 400 mA 6543A 6553A 35 831 V 6543A 6553A 38 5 V 6543A 6 142 A 6553A 15 356 A 6543A 6553A 10mV 6543A 2 mA 6553A 4mA 6543A 6553A 54 mV 6543A 6553A 700 mV 6543A 6553A 0 26 27 mV 6543A 1 5 5 5 mA 6553A 7 16 mA 6543A 1 6 8 1 mA 6553A 7 120 mA 6544A 6554A 61 425 V 6544A 6554A 66 0 V 6544A 3 583 A 6554A 9 214 A 6544A 6554A 15 mV 6544A mA 6554A 2 5 mA 6544A 6554A 93 mV 6544A 6554A 1 2 V 6544A 6554A 0 26 45 mV 6544A 1 5 3 2 mA 6554A 7 8 mA 6544A 1 6 7 1 mA 6554A 7 80 mA 6545A 6555A 122 85 V 6545A 6555A 132 0 V 6545A 1 535 A 6555A 4 095 A 6545A 6555A 30 mV 6545A 0 5 mA 6555A 1 25 mA 6545A 6555A 190 mV 6545A 6555A 2 4V 6545A 6555A 0 26 90 mV 6545A 1 5 1 4 mA 6555A 7 5 mA 6545A 1 6 1 8 mA 6555A 7 75 mA Note 1 For Performance Specifications see Table 1 la General Information 15 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table 1 1b Supplemental Characteristics for Series 654xA and 655xA continued Agilent Model Number and Parameter Valu
25. output Series 657xA 5040 1674 Screw bus bar Series 655xA 0515 1085 Screw carrying strap amp safety cover M5x0 8xl0 mm 0515 1132 Screw dc output safety cover Series 654xA 655xA 0515 1085 Screw output bus bar 1 4 20x1 2 Series 657xA 2940 0103 Screw output sense terminal M3x0 5x8 mm 0515 0104 Terminal crimp ac power cord L or N terminal Series 657xA 0362 0681 Terminal crimp ac power cord Gnd terminal Series 657xA 0362 0207 General Information 25 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com rtisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com 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 Save the shipping carton and packing materials in case the power supply must be returned to Agilent Technologies If you return it for service attach a tag identifying the model number and the owner Also include a brief description of the problem Items Supplied In addition to this manual check that the following items are included with your power supply see Table 1 4 for part numbers Power cord Your power supply was shipped with a power cord f
26. recall operation you press the recall key Recall For a save operation you press the save key which is Recan In this chapter such a shifted operation may be shown simply as Save The display consists of alphanumeric data and triangular shaped annunciators W along the bottom of the display Front Panel Operation 53 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table 5 1 Front Panel Controls and Indicators Control or Function or Indication Indicator 1 Display VOLTS Shows present output voltage of the power supply AMPS Shows present output current of the power supply Status Annunciators The power supply is in constant voltage mode The power supply is in constant current mode The power supply output is unregulated output is neither CV or CC The power supply output is disabled The overcurrent protection function is enabled A protection circuit has caused the power supply to shut down Press Protect to determine the reason Not used The power supply is in calibration mode The shift key Shift Jhas been pressed Not used Not used Not used These annunciators function only with the corresponding models of GPIB System family of power supplies 2 Output Rotary Controls Rotate clockwise to increase output voltage or program setting Provides the same function as the Voltage and Voltage keys Rotate clockwise to increase ou
27. terminal grounded Constant Voltage rms 1 9 mV Constant Voltage p p 16 mV Constant Current rms 12 mA Readback Accuracy with respect to actual output E 25 C 5 C Voltage 0 05 12 mV 0 05 30 mV 0 05 50 mV 0 05 90 mV 0 05 180 mV Current 0 1 150 mA 0 1 100 mA 0 1 60 mA 0 1 35 mA 0 1 18 mA Load Regulation change in output voltage or current for any load change within ratings Voltage 0 002 3004V 0 002 650u4V 0 002 1 2mV 0 002 2mV 0 002 4mV Current 0 005 10 mA 0 005 7 mA 0 005 4 mA 0 005 2 mA 0 005 1 mA Line Regulation change in output voltage or current for any line change within ratings Voltage 0 002 3004V 0 002 650u4V 0 002 1 2mV 0 002 2mV 0 002 4mV Current 0 005 10 mA 0 005 7 mA 0 005 4 mA 0 005 2 mA 0 005 1 mA Transient Response Time lt 900 HS for the output voltage to recover to within 100 mV following any step change in load current from 100 to 50 or 50 to 100 of the rated current AC Input Ratings selectable via internal switching see Appendix B Nominal line voltage 200 Vac 174 220 Vac Below 185 Vac derate output voltage linearly to 7 8 V 18 0 V 31 5 V 56 5 V 108 V 230 Vac 191 250 Vac Frequency range 47 63 Hz Output Terminal Isolation 240 Vdc maximum from output signal ground Note 1 For Supplemental Characteristics see Table 1 2b General Information 21 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOUR
28. the supply Connect the diode cathode to the battery terminal and the diode anode to the supply output terminal The diode may require a heat sink Series 654xA and 655xA Load Capacitance For Series 654xA and 655xA power supplies the OVP circuit has been designed to discharge fully charged capacitances up to a specified limit for each model These limits are as follows 6541A 6542A 6543A 6544A 6545A 6551A 6552A 6553A 6554A 6555A 700 000UF 35 000UF 15 000uF 7 000UF 3 000UF 1 6F 100 000uF S50 000uF 18 000UF 8 000uF If a load capacitance approaches the specified limit it is recommended that you do not make it a normal practice of tripping the OVP circuit and discharging the load capacitance through that circuit This could cause long term fatigue in some circuit components Because of its high output voltage the Agilent 6555A generates very high currents when discharging CAUTION the load capacitor under overvoltage conditions Excessive currents can damage the supply The peak discharge current is limited by the sum of the external capacitor s ESR equivalent series resistance and the series resistance of the external circuit For the Agilent 6555A s external capacitance limit of 8 000 microfarads this total resistance must be not less than 56 milliohms For smaller values of external capacitance this resistance may be derated linearly User Connections and Considerations 51 Artisan Technology Group Quality Instrumentation
29. 14 Responsible Party Alternate Manufacturing Site Manufacturer s Name Agilent Technologies Inc Agilent Technologies Malaysia Sdn Bhd Manufacturer s Address 140 Green Pond Road Malaysia Manufacturing Rockaway New Jersey Bayan Lepas Free Industrial Zone PH III 07866 11900 Penang USA Malaysia declares that the Products Product Names a Single Output 200 Watt System dc Power Supplies b Single Output 200 Watt Manually Controlled dc Power Supplies c Single Output 500 Watt System dc Power Supplies d Single Output 500 Watt Manually Controlled dc Power Supplies e Single Output 500 Watt Solar Array Simulator Model Numbers a 6641A 6642A 6643A 6644A 6645A b 6541A 6542A 6543A 6544A 6545A c 6651A 6652A 6653A 6654A 6655A d 6551A 6552A 6553A 6554A 6555A e E4350A E4350B E4351B Product Options This declaration covers all options and customized products based on the above products Conforms with the following European Directives The product herewith complies with the requirements of 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 The product herewith complies with the requirements of the EMC Directive 89 336 EEC including 93 68 EEC and carries the CE Marking accordingly European Union As detailed in Electromagnetic Compatibility EMC Certificate of Conformance Number CC TCF 00 074 based on Technical Construc
30. 35 7 mA 6545A 6555A 5mV 6545A 0 25 mA 6555A 0 5 mA 6545A 6555A 2mV 6545A 0 25 mA 6555A 0 5 mA Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table 1 1a Performance Specifications for Series 654xA and 655xA continued Transient Response Time lt 100 us for the output voltage to recover to its previous level within 0 1 of the rated voltage or 20 mV whichever is greater following any step change in load current up to 50 of the rated current AC Input Ratings selectable via internal switching see Appendix B Nominal line voltage 100 120 220 240 Vac 230 Vac Frequency range 13 6 10 10 47 63 Hz Output Terminal Isolation 240 Vdc maximum from chassis ground Notes 1 For Supplemental Characteristics see Table 1 1b Table 1 1b Supplemental Characteristics for Series 654xA and 655xA Note 1 Agilent Model Number and Parameter Value Output Programming Range maximum programmable values Voltage Overvoltage Protection Current Average Resolution Voltage Current Overvoltage Protection Accuracy Overvoltage Protection Analog Programming VP Analog Programming IP Current Monitor IM Referenced to supply output 6541A 6551A 8 190 V 6541A 6551A 8 8 V 6541A 20 475 A 6551A 51 88 A 6541A 6551A 2mV 6541A 6 mA 6551A 15 mA 6541A 6551A 13 mV 6541A 6551A 160 mV 6541A 6551A 0 26 6
31. 3A 6553A 60 ppm 0 3mV 6543A 95ppm 0 18mA 6553A 90ppm 0 3mA 6543A 6553A 60ppm 0 75mV 6543A 95ppm 0 33mA 6553A 90ppm 0 5mA 6543A 110ppm 0 33mA 6553A 100ppm 0 5mA 6543A 6553A 200ppm 5mV 6543A 6553A 60 ppm 0 4mV 6543A 90ppm 0 17mA 6553A 85ppm 0 3mA 6543A 75ppm 0 06mA 6553A 80ppm 0 3mA 6544A 6554A 0 02 3 mV 6544A 0 02 2 mA 6554A 0 02 5 mA 6544A 6554A 60 ppm 0 5mV 6544A 95ppm 0 12mA 6554A 90ppm 0 2mA 6544A 6554A 60 ppm 1 3mV 6544A 95ppm 0 20mA 6554A 90ppm 0 3mA 6544A 110ppm 0 20mA 6554A 100ppm 0 3mA 6544A 6554A 200ppm 13mV 6544A 6554A 60 ppm 0 7mV 6544A 90ppm 0 1 mA 6554A 85ppm 0 2mA 6544A 75ppm 0 06mA 6554A 80ppm 0 2mA Series 654xA 480 VA 400 W 60 W with no load Series 655xA 1380 VA 1100 W 120 W with no load Series 654xA 4 4 Arms 3 8 A rms 2 2 A rms 2 1 A rms 2 0 A rms 6545A 6555A 0 02 6 mV 6545A 0 02 1mA 6555A 0 02 2 5mA 6545A 6555A 60 ppm 1 1mV 6545A 95ppm 0 04mA 6555A 90ppm 0 2mA 6545A 6555A 60 ppm 2 6mV 6545A 95ppm 0 08mA 6555A 90ppm 0 2mA 6545A 110ppm 0 08mA 6555A 100ppm 0 2mA 6545A 6555A 200ppm 24mV 6545A 6555A 60ppm 1 25mV 6545A 90ppm 0 04mA 6555A 85ppm 0 15mA 6545A 75ppm 0 02mA 6555A 80ppm 0 15mA Series 655xA 12 Arms 10 Arms 5 7 Arms 5 5 Arms 5 3 A rms Guaranteed 888 88 SOURCE www artisantg com Table 1 1b Supplemental Characteristics for Series 654xA and 655xA continued Maximum Reverse Bias With AC input
32. 93 ym July 2001 DE Date Hank Kowalla Quality Manager at PPPGU For further information please contact your local Agilent Technologies sales office agent or distributor Authorized EU representative Agilent Technologies Deutschland GmbH Herrenberger Stra e 130 D71034 B blingen Germany Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table of Contents General Information A cbcubace ak ten sant sued E dh 11 Safety Considerations een UR EE EES 11 Instrument Identification 0i erre er O OT 11 OPLONS MM M as yoaS ae 11 A A de 12 DESCTINPUON ka kika sa pe an p eere Teteres deve eya Ede Ee RU e ERE Eee cate ak ras e eu or ko akyon E bn pk ERU ee ee eg 12 Front Panel Programming camote eerte rate ore tpe ask fake e Draper e fon poids ek ENEE 13 Analog Programming BG 13 OUT pUt Character 13 Specifications and Supplemental Characteristics 00 0 0 cece ceecseeseeeeeeeeeeeeeeeeeesecesecaecsaecaeecaeeeaeseneeeneeeeeees 13 Installation IMS POCH ON ia Ad elans cask pa Ueda A ETE 27 IR 27 Items SUpplee DEE 27 Location and COOLING init dial iii 27 Bench Operation concomitante ias ibas ie Ed 27 Rack Mounting carne oo dak la SE tea Se RD F REX vou TAG SERRE EX EE ERE RR EE 27 Temperature P rfOfMANCE C Din 28 Input Power Soult
33. 99 Japan Agilent Technologies Japan Ltd Measurement Assistance Center 9 1 Takakura Cho Hachioji Shi Tokyo 192 8510 Japan tel 81 426 56 7832 fax 81 426 56 7840 Technical data is subject to change Latin America Agilent Technologies Latin American Region Headquarters 5200 Blue Lagoon Drive Suite 950 Miami Florida 33126 U S A tel 305 267 4245 fax 305 267 4286 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 Asia Pacific Agilent Technologies 24 F Cityplaza One 1111 King s Road Taikoo Shing Hong Kong tel 852 3197 7777 fax 852 2506 9284 Agilent Sales and Support Offices 75 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com 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 11 06 02 The declarations pages have been updated Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com A rtisan Artisan Technology Group is your source for quality Technology op new and certified used pre owned equipment FAST SHIP
34. A 250V plug General Information 11 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com List of Options continued 844 Power cord 10 AWG UL listed CSA certified with NEMA L6 30P 30A 250V locking plug ETA Rack mount kit Agilent 5062 3974 hr VE eee Rack mount kit Agilent 5062 3977 Te X x Rack mount kit with handles Agilent 5062 3975 Kell Rack mount kit with handles Agilent 5062 3983 A xX x Accessories Agilent No Description 1494 0058 Heavy duty slide mount kit for Series 657xA 1494 0059 Standard slide mount kit for Series 655xA 1494 0060 Standard slide mount kit for Series 654xA Description These units form a family of unipolar analog programmable power supplies organized as follows Family Power Models Series 654xA 200 W Agilent 6541A 6542A 6543A 6544A 6545A Series 655xA 500 W Agilent 6551A 6552A 6553A 6554A 6555A Series 657xA 2000 W Agilent 6571A 6572A 6573A 6574A 6575A This family is similar in performance to the corresponding GPIB system power supplies Analog Family Corresponding GPIB Family Agilent 654xA Agilent 664xA Agilent 655xA Agilent 665xA Agilent 657xA Agilent 667xA Each power supply is programmable locally from the front panel or remotely via a rear panel analog control port Operational features include Constant voltage CV or constant current CC output over the rated output range Built in overvoltage OV ov
35. CE www artisantg com Table 1 2b Supplemental Characteristics for Series 665xA Note 1 Parameter Agilent Agilent 6572A Agilent Agilent 6574A Agilent 6575A 6571A 6573A Output Programming Range maximum programmable values Voltage 8 190 V Overvoltage Protection OVP 10 0 V Current 225 23 A Average Resolution Voltage Current OV Protection Accuracy at calibration temperature 5 C Overvoltage Protection 200 mV Analog Programming VP Analog Programming IP Current Monitor IM Factory calibration temp 25 C 20 475 V 24 0 V 102 37 A 61 425 V 72 0 V 35 83 A 122 85 V 144 0 V 18 43 A Drift Temperature Stability following a 30 minute warmup change in output over 8 hours under constant line load and ambient temperature Voltage Current 0 02 0 24mV 0 02 69mA 0 02 0 6 mV 0 02 35mA Temperature Coefficients change C and 30 minute warmup Voltage 50ppm 0 04mV Current 75 ppm 25mA Voltage Readback 60 ppm 0 1mV Current Readback 85 ppm 30 mA Overvoltage Protection 200ppm 1 8mV Analog Programming VP 60 ppm 0 1mV Analog Programming IP 275ppm 26mA Current Monitor IM 50 ppm 3mA SOppm 0 2 mV 75 ppm 12 mA 60 ppm 0 3mV 85 ppm 15 mA 200 ppm 5 mV 60 ppm 0 3mV 275 ppm 14mA 50 ppm 2mA 0 02 1 mV 0 02 20mA SOppm 0 7mV 75 ppm 7 mA 60 ppm 1 mV 85 ppm 9 mA 200 ppm 8mV 60ppm 0 5mV 275 ppm 9mA 50 ppm 1mA 0 02 1 8
36. FI SHIELD Line Voltage Conversion Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Figure B 3 Series 657xA Line Select Switch Index A Ee 27 ampere capaCily Me 42 analog terojnin gore n LEER 40 42 connector dis 41 42 jj g 13 41 PPO PIU EE 13 40 50 51 57 58 59 programming MEGUENCY C biten ak asa Dosa p re e leu byen ni non v pi ob ad min pena HP 51 programming slew ET 51 programming VOtage 1SOLACION NP 51 annunciators nn eege lichens gb eb nach aci 54 RTE 54 64 LK GC 12 54 CV GE 12 54 LUC 32 33 54 It EE EE 54 OCP oie Acne ees ne Ae ee iE Le A 54 IN E 33 54 58 59 EE 56 SHI DEE 35 54 A NA 54 Uan 54 60 B backspace key E 34 55 57 C e 64 66 E IM MEM M M a ka ke 65 66 A A A ERES 64 calibration PASS WONG iced epe eese te od 37 64 EE T d 43 VE e 13 43 55 57 58 checkout QUIPU EE 34 POW EEO EE 32 CHECKSUM EE 37 eege 55 Common PEO ayi roerne tee odinate ese bi ere UERR 41 50 51 CURRENT control 542 tree k de eee ea io an de ke Po new tia dias 12 32 55 EE 55 Current A oe g 34 55 58 EV EE 13 43 55 57 58 Index 69 Artisan Technology Group Quality Instrumentation
37. OUTPUT IMPEDANCE MILLIOHMS OUTPUT IMPEDANCE MILUOHMS 1K FREQUENCY HZ 1K FREQUENCY HZ Agilent 6571A Agilent 6572A 3 E g j 3 3 g i i 5 P K 10K FREQUENCY HZ FREQUENCY HZ Agilent 6573A Agilent 6574A ESZXIMAD GAL OUTPUT IMPEDANCE MILLIOHMS Agilent 6575A 24 General Information Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table 1 3 Replaceable Parts List Foot cabinet 5041 8801 Fuse power Series 654xA 100 Vac line voltage 6 AM 2110 0056 Series 654xA 120 Vac line voltage 5 AM 2110 0010 Series 654xA 220 230 240 Vac line voltage 3 AM 2110 0003 Series 655xA 100 Vac line voltage 15 AM 2110 0054 Series 655xA 120 Vac line voltage 12 AM 2110 0249 Series 655xA 220 230 240 Vac line voltage 7 AM 2110 0614 Series 657xA 200 Vac line voltage 25 AM 2110 0849 Series 657xA 230 Vac line voltage 25 AM 2110 0849 This is an internal fuse not replaceable by the operator Knob rotary output control 0370 1091 Lockwasher output bus bar 1 4 spring Series 657xA 3050 1690 Manual service Series 654xA and 655xA Nut power ground hex w lw 3 8x32 0590 0305 See Options Safety cover ac input w strain relief connector amp rubber boot Series 657xA 5040 1676 Safety cover dc output Series 654xA 655xA 0360 2191 Safety cover dc
38. P 15 19 V b SERIES 657xA Figure 4 9 External Voltage Programming If you cannot avoid capacitive coupling it may help to place capacitors from the unused programming inputs to ground Especially with auto parallel operation connecting a capacitor 24 000 pF from VP to P Common on the master supply will ensure proper operation Also with auto parallel operation do not allow more than about 500 pF capacitive loading between IM and Common P Programming Considerations 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 operation the maximum programming rate is 3750 V s The maximum downprogramming rate when the power supply is sinking current is 750 V s These restrictions can be expressed as the maximum programming frequency that can be applied without causing distortion at the output The following formula can be used to determine this frequency 50 voltage rating of supply Fmax i p p amplitude of desired output sine wave At frequencies gt 6 kHz voltage programming is subject to a 3 dB bandwidth limitation 50 User Connections and Considerations Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Programming Series 657xA Supplies Wiring Considerations The input impedance of the analog input is over 30 kQ If
39. PING AND SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT DELIVERY Experienced engineers and technicians on staff Sell your excess underutilized and idle used equipment TENS OF THOUSANDS OF at our full service in house repair center We also offer credit for buy backs and trade ins IN STOCK ITEMS www artisantg com WeBuyEquipment EQUIPMENT DEMOS HUNDREDS OF InstraV ea REMOTE INSPECTION LOOKING FOR MORE INFORMATION MANUFACTURERS Remotely inspect equipment before purchasing with Visit us on the web at www artisantg com 7 for more our interactive website at www instraview com information on price quotations drivers technical LEASING MONTHLY specifications manuals and documentation RENTALS ITAR CERTIFIED EE Contact us 888 88 SOURCE sales artisantg com www artisantg com
40. Press Press Press Press Protect 34 Turn On Checkout Essentially zero outputs with Dis annunciator on Set a minimum operating voltage to cause current to low Dis annunciator goes off CC annunciator comes on and AMPS display shows some current If there is no current and CN annunciator remains on increase the operating voltage setting Current increases about 7 milliamperes each time you press the key Current decreases about 7 milliamperes each time you press the key Control operates similarly to the and keys Turning the controls more quickly causes a more rapid change in current You have enabled the overcurrent protection circuit which tripped because of the output short The CC annunciator goes off and the OCP and Prot annunciators come on The output current is near zero Indicates the overcurrent protection circuit has tripped see Supplemental Characteristics in Chapter 1 Dis annunciator comes on You have disabled the overcurrent protection circuit The OCP annunciator goes off You have cleared the OC protection circuit The Prot annunciator goes off Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table 3 2 Checking the Current Functions continued Press Dis annunciator goes off and the CC annunciator comes on AMPS shows some current Press GIG AMPS increases to maximum output Press Dis annunciator comes on an
41. acitors should be about 50 greater than the anticipated load lead drop Addition of the 20 Q resistors will cause a slight voltage rise at the remote sensing points For utmost voltage programming accuracy the supply should be recalibrated with the DVM at the remote sensing points see Appendix A Ri gt Ci ales BUS 2 xi A Ci C2 33 4F T R C3 LOAD BYPASS CAPACITOR e c3 a R1 R2 20 OHM 1 t LOAD LEADS BUS BAR 2 REMOTE SENSE POINTS T R2 5 AMAN Figure 4 5 Series 657xA Sense Lead Bypass Network 46 User Connections and Considerations Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Operating Considerations Auto Parallel Operation Auto Parallel Wiring Figure 4 6 illustrates how power supplies can be connected in auto parallel for increased current output You can connect supplies of the same model in auto parallel as follows e Series 654xA or 655xA up to three supplies e Series 657xA up to five supplies Use load leads of a sufficient wire size so that the absolute voltage difference between 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 o
42. age GROUND THE INSTRUMENT To minimize shock hazard the instrument chassis and cover must be connected to an electrical ground The instrument must be connected to the ac power mains through a three conductor power cable with the third wire firmly connected to an electrical ground safety ground at the power outlet Any interruption of the protective grounding conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury 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 earth pole of the ac power lines supply mains FUSES Only fuses with the required rated current voltage and specified type normal blow time delay etc should be used Do not use repaired fuses or short circuited fuseholders To do so could cause a shock or fire hazard DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE Do not operate the instrument in the presence of flammable gases or fumes KEEP AWAY FROM LIVE CIRCUITS Operating personnel must not remove instrument covers Component replacement and internal adjustments must be made by qualified service personnel Do not replace components with power cable connected Under certain conditions dangerous voltages may exist even with the power cable removed To avoid injuries always disconnect power discharge circuits and remove exte
43. and hold for an increasingly rapid output change 0 iru 9 Q Press to select numerical values Press to enter a minus sign Press to delete the last keypad entry Use this key to correct one or more incorrect digits before they are entered Clear Entr Press to delete an entire keypad entry and return to the meter mode Use this key to exit from a value before it is entered Press to enter a value or to accept an existing value and return the display to the meter mode The remaining shifted keys are for calibration see Appendix A Front Panel Operation 55 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com AM E E MO Ce Is 2 Gro 15 584 es aa lao A CC Unr Dis OCP Prot Err Cal Shit Amt Addr SRQ Lu eer DCH 2 VOLTAGE CURRENT Q Current IN co O 6 Figure 5 1 Front Panel Controls and Indicators Programming The Output Introduction Im portant These instructions show how to program a single power supply There are special considerations when you have two or more supplies connected in series or in auto parallel 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 Supplemental Characteristics of Chapter 1 If you attempt to enter a value n
44. ant current over its voltage and current ratings see Performance Specifications The operating locus is shown by the output Characteristic Curve in Supplemental Characteristics The operating point is determined by the voltage setting Vs the current setting Is and the load impedance Two operating points are shown Point is defined by the load line cutting the operating locus in the constant voltage region This region defines the CV mode Point 2 is defined by the load line cutting the operating locus in the constant current region This region defines the CC mode Downprogramming The power supply can sink current for more rapid down programming in the CV mode For Series 654xA and 655xA 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 657xA power supplies this is an uncharacterized current sinking area that provides a limited downprogramming capability Specifications and Supplemental Characteristics Table 1 1 lists the specifications and supplemental characteristics of the Series 654xA and 655xA power supplies Table 1 2 lists the specifications and supplemental characteristics for the Series 657xA power supplies Specifications are warranted over the specified temperature range Supplemental characteristics are not warranted but are descriptions of performance determined either
45. ar panel 1 Figure 2 1 Proceed as follows 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 4 in Chapter 1 Do not use a slow blow type fuse 3 Turn on the power supply and check the operation Turn On Checkout 35 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Series 657xA Supplies Hazardous voltage can remain inside the power supply even after it has been turned off Fuse replacement should be done only by qualified electronics personnel A The line fuse is located inside the power supply To change it proceed as follows GR III IV V VI Turn off the front panel power switch and unplug the line cord from the power source Remove 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 1 Figure 3 1 Observe the input rail LED under the RFI shield 4 Figure B 3 in Appendix B 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 Connect a dc voltmeter across test points TP1 and TP2 see Figure B 3 It may be necessary to remove the RFI shield in
46. at the display indicates OV 58 Front Panel Operation Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Clearing the OVP Condition With the OVP tripped return to the meter mode and try to clear the condition by pressing Nothing will appear to happen because the CV trip point is still below the programmed output voltage Thus as soon as the circuit is cleared it trips again You can clear the OV condition by e lowering the output voltage below 11 5 the OV setting e or by raising the OV trip voltage above the output voltage setting Try either of these methods Now when you press the Prot annunciator will go off and the output voltage will return to normal Note In Series 654XA and 655XA supplies the OVP circuit shorts the power supply output through an SCR If the load maintains current through the SCR the above methods will not clear an OVP trip condition You must first remove the external current source before attempting to clear OVP 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 will come on and power supply will continue to operate normally until it is forced into CC operation If that occurs
47. ay use the ENTRY keys to change the value Press to display the output current setting After pressing Current you may use the ENTRY keys to change the value When the Prot annunciator comes on press to see which protection circuit caused the power supply to shut down Response can be OC overcurrent OT overtemperature or OV overvoltage If no protection circuit has tripped the display will show dashes Prot Clear Press this key to reset the protection circuit If the condition that caused the circuit to trip has been removed the Prot annunciator will go off Press to enable or disable the power supply OCP trip circuit This key toggles between the to states Press to display the OV trip voltage setting After pressing you may use the ENTRY keys to change the value 5 ENTRY Keys Press to increment the output voltage in the CV mode or the voltage setting after you have pressed the key Press to decrement the output voltage in the CV mode or the voltage setting after you have pressed the key Press to increment the output current in the CC mode or the current setting after you have pressed the key Current Press to decrement the output current in the CC mode or the current setting after you have pressed the key gt The four incremental keys operate in two modes Press and release for a single output change determined by the control resolution see Supplemental Characteristics in Chapter 1 Press
48. bove state to location 2 by pressing 2 Enter Now restore the first state by pressing and verify the parameters Restore the second state by pressing 2 Enter Note how the power supply is automatically programmed each time Turn On Operation Whenever you apply power to a new power supply it automatically turns on in a safe reset state with the following parameters off minimum near zero maximum off It is recommended that you leave the turn on conditions as programmed However you may change them if you wish To do this proceed as follows 1 Setup the power supply to the state you want when it is turned on 60 Front Panel Operation Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com 2 Store that state to location 0 Turn off the power supply Hold in the key and turn the power supply back on The display indicates RCL O PWR ON to verify that the power supply has configured its turn on state to that stored in location 0 5 From now on the supply will always turn on to the state defined in location 0 Bow Whenever you wish you can return the power supply to the original factory reset state To do this simply hold down the 9 key when you turn on the supply The display indicates RST PWR 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 that state Front Panel Operation 61
49. by design or type testing General Information 13 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table 1 1a Performance Specifications for Series 654xA and 655xA Note 1 Agilent Model Number and Parameter Value Specifications are warranted over the temperature range 0 to 55 C with a resistive load and the output connected for local sensing Output Ratings Voltage 6541A 6551A 0 8V 6541A 0 20A 6551A 0 50A Current 6542A 6552A 0 20 V 6542A 0 10A 6552A 0 25A Derate the output current 1 per C from 40 C to 55 C Front Panel Programming Accuracy O 25 5 C 6541A 6551A 0 06 5 mV 6541A Voltage Current 0 14 26mA 0 14 13mA 6551A 0 15 60mA 0 15 25mA Ripple amp Noise from 20 Hz to 20 MHz with outputs ungrounded or with either output terminal grounded 6541A 6551A 300 LV 6541A 6551A 3mV 6541A 10 mA 6551A 25 mA Constant Voltage rms Constant Voltage p p Constant Current rms 6542A 6552A 0 06 10 mV 6542A 6552A 6542A 6552A 300 uV 6542A 6552A 3mV 6542A 5 mA 6552A 10 mA Readback Accuracy with respect to actual output E 25 C 5 C 6541A 6551A 0 07 6 mV 6541A 0 15 26 mA 6551A 0 15 67 mA 6541A 0 35 40 mA 6551A Voltage Current Current 0 35 100 mA Load Regulation change in output voltage or current for any load change within ratings Voltage
50. chnology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com PwHinwss i240 VOC MAK A EA pe elele INSERT WIRES AWG 12 22 TIGHTEN SCREWS vP IM a WIRING FOR SERIES 654xA dou b WIRING FOR SERIES 657xA AND 655xA Figure 4 3 Analog Connector Table 4 2 Stranded Copper Wire Ampere Capacity and Resistance Area Ampacity Resistance AWG Area Ampacity Resistance mm Q m No mm Q m 0 82 15 4 0 0210 8 37 75 0 0020 1 31 19 4 0 0131 13 3 100 0 0013 2 08 31 2 0 0082 21 1 135 0 0008 3 31 40 0 0 0052 33 2 180 0 0005 5 26 55 0 0 0033 53 0 245 0 0003 Note 1 AWG wire rating derived from MIL W 5088B 2 Ampacity of aluminum wire is approximately 84 that of copper wire 3 With bundled wires use the following percentages of the rated ampacity 2 conductors 94 4 conductors 83 3 conductors 8996 5 conductors 76 4 Maximum temperatures ambient 50 C conductor 105 C Output Isolation The output of the power supply is isolated from earth ground Either output terminal may be grounded or an external voltage source may be connected between either output and ground However both output terminals must be kept within 240 Vdc of ground An earth ground terminal is provided on the rear panel for convenience such as grounding wire shields The earth ground terminal on the rear panel is a low noise signal ground for convenience only It Is not designed to function as a safet
51. d AMPS reading drops to near Zero Turn off the power supply and remove the short from the output terminals Current increments are for Agilent 6552A See Average Resolution in Supplemental Characteristics of Chapter 1 for your specific model Maximum current value is for Agilent 6552A See Output Ratings in Performance Specifications of Chapter 1 for your specific model ici key is the unlabeled blue key Save Recall Checkout The following steps check the power supply save and recall function keys HM Make certain that the Dis annunciator is off Then set the voltage output to 5 volts by pressing 6 Enter M Save this value to location 1 by pressing Shift Recan J 1 Enter W Remove the output voltage by pressing Recall J 9 Enter This recalls the power supply values stored in location 0 which are the factory reset values see Chapter 5 for more information E Press Recall 1 and notice that the output voltage returns to 5 In Case Of Trouble Line Fuse If the power supply appears dead with a blank display and the fan not running first check your power source to be certain line voltage is being supplied to the power supply If the power source is normal the power supply line fuse may be defective If this is the case replace the fuse only once If it fails again investigate the reason for the failure Proceed as follows Series 654xA and 655xA Supplies The line fuse is located on the re
52. d leads causes the supply to increase the voltage at the output terminals so it can maintain the proper voltage at the load When you attempt to operate at the full rated output at the load this forces the supply voltage at the output terminals to exceed the supply s rated output This will not damage the supply but may trip the OVP overvoltage protection circuit which senses the voltage at the output When operated beyond its rated output the 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 User Connections and Considerations 45 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com 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 the sense leads to minimize external noise pickup and route them parallel and close to the load leads In noisy environments it may be necessary to shield the sense leads Ground the shield only at the power supply Do not use the shield as one of the sense conductors Note Agilent 657xA Series The signal ground binding post on the rear panel is a convenient place to ground the sense shield Stability Using remote sensing under unusual combinations of load lead le
53. e pe eka 28 S nies 654x A and 655xA Supplies cerei e konsole eterna CERN 28 Series 657X A SUpplies eet ehe o er EE E FCU TERES EGEG A EO EE 28 Turn On Checkout Intto dUCOn 3 aene ERR bese aes si 31 Preliminary CheckoUut ue tret UTER IRR EE TREE ETEEN EEE EE ERLEBT NEESS RUE ERE ban 31 Series 654x A and GOSKA Supplies sce casita e sense eleg oen epos ENEE 31 Series GD 7 XA Oppe iii abi 31 Power On Checkout E 32 Output Checkout esst m 32 SITET KEYS oct iii pie 32 EI EE 32 Setting the Output Voltage used E T ii 32 Setting the Output Eent T 32 Save Recall Checkout coordinada aia id ios 35 Ta Case of be EE 35 A O RR Oe REIR 35 Series 654xA and 655x A Supplies ceeeseetentten tin cene tetra edo sone Eea E ipe Rea o Eua danna i sor Ee 35 A SUPPLIES ye sees 36 Ettor M ssa ZES iii dead 36 Selftest NC 37 Rumtime Error Messages C Err E E EEEE land abo two bou Lak EEE EEES 38 User Connections and Considerations Rear Panel Connections rere ttem ere e ER HE sods Eg e pab ke fi EM ERU sepan ke E EEA 39 Output Connectors E n 39 Series 654x A and 655x A Supplies rait eto sevo eki manye ase desan od ns peson e pei bi mad RIPER SEE EA 39 Series 65 TXA lib miii iio 39 Analog Connector EE 39 Artisan Techn
54. e Drift Temperature Stability following a 30 minute warmup change in output over 8 hours under constant line load and ambient temperature Voltage Current 6541A 6551A 0 02 0 4 mV 6541A 0 02 16 mA 6551A 0 02 40 mA Temperature Coefficients change per C Voltage Current Voltage Readback Current Readback Current Readback Overvoltage Protection Analog Programming VP Analog Programming IP Current Monitor IM Maximum Input Power Maximum AC Line Current Ratings 100 Vac nominal 120 Vac nominal 220 Vac nominal 230 Vac nominal 240 Vac nominal 16 General Information Artisan Technology Group Quality Instrumentation 6541A 6551A 60ppm 0 1mV 6541A 95ppm 0 82mA 6551A 90ppm 1 4mA 6541A 6551A 60ppm 0 2mV 6541A 95ppm 1 2mA 6551A 90ppm 1 7mA 6541A 110ppm 1 2mA 6551A 100ppm 1 7mA 6541A 6551A 200ppm 1 6mV 6541A 6551A 60 ppm 0 1mV 6541A 90ppm 0 56mA 6551A 85ppm 1 4mA 6541A 75ppm 0 61mA 6551A 80ppm 1 4mA 6542A 6552A 0 02 1 mV 6542A 0 02 6 mA 6552A 0 02 15 mA 6542A 6552A 60 ppm 0 2mV 6542A 95ppm 0 41mA 6552A 90ppm 0 7mA 6542A 6552A 60ppm 0 5 mV 6542A 95ppm 0 62mA 6552A 90ppm 0 9mA 6542A 110ppm 0 62mA 6552A 100ppm 0 9mA 6542A 6552A 200ppm 3 3mV 6542A 6552A 60ppm 0 25mV 6542A 90ppm 0 28mA 6552A 85ppm 0 7mA 6542A 75ppm 0 3mA 6552A 80ppm 0 7mA 6543A 6553A 0 02 2 mV 6543A 0 02 3 mA 6553 A 0 02 8 mA 654
55. e German Sound Emission Directive from 18 January 1991 Sound Pressure Lp lt 70 dB A At Operator Position Normal Operation According to EN 27779 Type Test 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 the manual occurring between revisions are covered by change sheets shipped with the manual In some cases the manual change applies only to specific instruments Instructions provided on the change sheet will indicate if a particular change applies only to certain instruments O Copyright 1992 1993 Agilent Technologies Inc Edition 1 April 1992 pik January 1993 October 1993 reprinted April 2000 This document contains proprietary information protected by copyright All rights are reserved No part of this document may be photocopied reproduced or translated into another language without the prior consent of Agilent Technologies The information contained in this document is subject to change without notice Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com yh DECLARATION OF CONFORMITY C s Nn amies Gen According to ISO IEC Guide 22 and CEN CENELEC EN 450
56. e Manual Note If you want Cal Enable to operate without requiring any password change the password to 0 zero Calibration 65 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Disabling the Calibration Mode To disable the calibration mode press Cal Disable The display will return to the meter mode with the Cal annunciator off If you shut off the power supply with calibration enabled it will be disabled when you turn it back on Calibration Error Messages The following error messages may appear during calibration Table A 3 Calibration Error Messages CAL ERROR An entered value is not within acceptable range DOES NOT CAL Computed calibration constant is out of range PASSWD ERROR You entered an incorrect password WRONG MODE The power supply is not in CV or CC mode as required 66 Calibration Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Line Voltage Conversion Series 654xA and 655xA Power Supplies Hazardous voltage can remain inside the power supply even after it has been turned off This procedure should be done only by qualified electronics personnel Provisions for converting the operating line voltage are provided inside the power supply These provisions are e Series 654xA supplies voltage select switches e Series 655xA supplies voltage select jumpers You must also change the power
57. e front panel keys perform two functions one labeled in black and the other in blue You access the blue function by first pressing the blue key which is not labeled When the Shift annunciator is on you will know you have access to the key s shifted blue function Backspace Key he C key is an erase key If you make a mistake entering a number and have not yet entered it have not pressed CEnter you can delete the number by pressing E You may delete as many numbers as you wish by repeatedly pressing this key Note The voltage and current values used in these tests are for a typical Agilent 655xA Series supply the Agilent 6552A Table 1 la and Table 1 Ib in Chapter 1 lists the ranges for other supplies If needed refer to those tables for the voltage and current ratings of your supply Setting The Output Voltage Perform the steps in Table 3 1 to check the basic voltage functions with no load connected to the power supply The VOLTS display will show various readings Ignore the AMPS display Setting The Output Current You must have a load on the power supply to generate a current output For this purpose you will connect a shorting wire across the output terminals of the supply 32 Turn On Checkout Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Some power supplies have a high output current capacity To prevent overheating or possible melting of CAUTION the shorting wire
58. e konne Depa T 59 CLOW EE 48 49 oo uc che een eege ENEE EELER NEEN renka en an pei enb enben i 58 protection diodes ei tt si aie ke Sa BNA pani EAR 48 EE 49 59 P EEN 64 POWER EE 11 27 29 power tec ptacl scnti a aeir EET 11 POWER OJ ARLES E 11 16 21 EE 34 55 58 59 ee 55 59 PWR ON INIT message 32 R TACK une Wull e EE 11 27 ee 54 RS geess Ee EE DEE ee ett ege 45 60 Termote SENSIN EE 45 51 remote sense switch see switch sense resistor shunt see shunt calibration MAA A NN 49 RFI O 9 36 SUCI UR 17 23 ringing output 4 5 RPG control see CURRENT and VOLTAGE control RCL PWR ON E 61 RST OEB 61 72 Index Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com EELER 31 41 44 45 A RH E TUS 11 safety compliance errereen 17 23 safety cover Will EE 25 39 POWEL EE 29 safety WAS as 11 36 as 54 60 SAVING States eei E RE ei 35 60 sense leads see remote sensing A ER 11 service E UE 11 25 65 O VEER 34 53 54 56 Shunt calibrato ee eebe E eegen Ee Ee Kee E 63 shide mount TE 12 SPSCHICAUMON Se MD 14 21 Supplemental characteristics C 15 22 epic P 47 48 Supplies Ini SELIES dies 49 SUP AAA ko kou ese kai akne Ra a ko DW ea e OR En PERE ke PE ken Dwe ER Ben e ka ik e RE oken dak Do
59. ercurrent OC and overtemperature OT protection Automatic turn on selftest Pushbutton nonvolatile storage and recall of up to 5 operating states Local or remote sensing of output voltage Auto parallel operation for increased total current Series operation for increased total voltage Analog input for remote programming of voltage and current Voltage output for external monitoring of output current User calibration from the front panel 12 General Information Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Front Panel Programming The front panel has both rotary RPG and keypad controls for setting the output voltage and current The panel display provides digital readouts of the output voltage and current Other front panel controls permit Enabling or disabling the output Setting the overvoltage protection OVP trip voltage Enabling or disabling the overcurrent protection OCP feature Saving and recalling operating states Calibrating the power supply Analog Programming The power supply has an analog port for remote programming The output voltage and or current of the power supply may be controlled by d c programming voltages applied to this port The port also provides a monitor output that supplies a d c voltage proportional to the output current Output Characteristic General The power supply can operate in either CV constant voltage or CC const
60. f the master supply as shown by the dashed lines in Figure 4 6 Note To avoid output oscillations with Series 654xA and 655xA supplies observe the wiring suggestions given under External Voltage Control i eruit IP VPIM IM tP S S MASTER CV MODE ARCA ume eS rz RE i ilb p a gi ZW gt 2 w AT 1 S9 S S SC SLAVE 2 CC MODE a SERIES 654xA AND 655xA SERIES 657xA Figure 4 6 Connecting Power Supplies in Auto Parallel User Connections and Considerations 47 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com General 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 supplies will operate in CC mode Series 654xA and 655xA Auto Parallel Programming CAUTION Follow the following operating precautions if you are connecting three of these models in auto parallel You must use caution when connecting three Series 654xA and 655xA power supplies for auto parallel operation That is because of the OVP crowbar circuits within these supplies If the OVP circuit of the second slave trips its crowbar circuit will draw current from the other two supplies
61. his manual for general safety information Before installation or operation check the power supply and review this manual for safety warnings and instructions Safety warnings for specific procedures are located at appropriate places in the manual Instrument Identification The power supply is identified by a unique two part serial number such as 3343A 00177 The first part or prefix is a number letter combination that provides the following information 3343 The year and week of manufacture or last significant design change Add 1960 to the first two digits to determine the year For example 33 1993 34 1994 etc The last two digits specify the week of the year 43 the 43rd week A The letter indicates the country of manufacture where A USA Options List of Options 654xA 655xA 657xA 100 Input power 100 Vac nominal LS X 120 Input power 120 Vac nominal LS X k 200 Input power 200 Vac nominal LL X j 220 Input power 220 Vac nominal LS X k 230 Input power 230 Vac nominal LS X k 240 Input power 240 Vac nominal LS Y X 832 Power cord 4 mm harmonized without plug 834 Power cord 10 AWG UL listed CSA certified without plug 841 Power cord 12 AWG UL listed CSA certified with NEMA 6 20P uae ad P S 832 834 Power cord 4 mm harmonized with IEC 309 32A 220V plug 843 Power cord 12 AWG UL listed CSA certified with JIS C8303 25
62. hort as possible and twisted or bundled to reduce lead inductance and noise pickup If cabling considerations require the use of distribution terminals that are remotely located from the supply connect the output terminals to the distribution terminals by a pair of twisted or bundled wires Use separate wires for connecting each load to the distribution terminals In these circumstances remote voltage sensing is recommended see Remote Voltage Sensing Sense either at the remote distribution terminals or if one load is more critical than the others directly at the critical load see dashed lines in Figure 4 1 Note that the power supply s voltage readback occurs at the sense terminals PYPMMIPSS a SERIES 654xA AND 655xA b SERIES 657xA Figure 4 4 Multiple Load Connections Remote Sensing Optional Local Voltage Sensing Your power supply was shipped set up for local sensing This means that the supply will sense and regulate 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 Series 654xA and 655xA Supplies Local sensing is obtained by placing the SENSE switch see Figure 4 1 in the Local position The power supply is shipped with the switch in this position Series 657xA Su
63. lel Operation Note Removing or disabling the power supply OVP crowbar SCR is another possibility For further information contact an Agilent Service Engineer through your local Agilent Sales and Support office 48 User Connections and Considerations Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Series Operation Floating voltages must not exceed 240 Vdc No output terminal may be more than 240 V from chassis ground Figure 4 8 shows how power supplies can be connected in series for higher voltage output Series connections are straightforward in this case Program each power supply independently If two supplies are used in the series configuration program each supply for 50 of the total output voltage Set the current limit of each supply to the maximum that the load can handle without damage a SERIES 654xA AND 655xA b SERIES 657xA Figure 4 8 Connecting Power Supplies in Series Each power supply has a reverse voltage protection diode across its output If a reverse voltage is CAUTION applied the supply cannot control the current conducted through this diode To avoid damaging the supply never connect it in such a way that a reverse voltage can force it to conduct current in excess of the supply s maximum reverse diode current see Supplemental Characteristics External Voltage Control The setup shown in Figure 4 9 allows an external dc voltage to prog
64. ls are required for non stationary installations These are normally ordered with the cabinet and are not included with the rack mounting kits Installation 27 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Temperature Performance A variable speed fan cools the supply by drawing air through the sides and exhausting it out the back Using Agilent rack mount or slides will not impede the flow of air The temperature performance is as follows Series 654xA 655xA Operates without loss of performance within the temperature range of 0 C to 40 C and with derated output from 40 C to 55 C Series 657xA Operates without loss of performance within the temperature range of 0 C to 55 C 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 bel on the rear of your supply and verify that the voltage shown there CAUTION Check the line corresponds to the nominal line voltage of your power source If it does not see Appendix B for instructions on changing the power supply s line voltage configuration Series 654xA and 655xA You can operate your supply from a nominal 100 V 120 V 220 V 230 V or 240 V single phase ac power source as indicated on the rear panel line Rating label See AC Input Ratings in Table 1 la for the voltage and frequency range f
65. mV 0 02 10 mA SOppm 1 2 mV 75 ppm 4 mA 60 ppm 1 2mV 85 ppm 5 mA 200 ppm 13mV 60 ppm 0 7mV 275 ppm 5 mA 50ppm 0 6mA 0 02 3 6 mV 0 02 6mA 50 ppm 2 4 mV 75 ppm 2 mA 60 ppm 3 mV 85 ppm 2 5mA 200 ppm 25mV 60 ppm 1 5mV 275 ppm 3 mA 50ppm 0 3mA Maximum Input Power 3800 VA 2600 W 100 W with no load Maximum AC Line Current Ratings 200 Vac nominal 230 Vac nominal Maximum Reverse Bias Current Remote Sensing Capability Voltage Drop Per Lead Load Voltage Load Regulation Degradation due to load lead drop in output Degradation due to load lead drop in output Up to 1 2 of rated output voltage None AmV regulation With AC input power applied and the de output reverse biased by an external de source the supply will continuously withstand without damage a current equal to its output current rating Subtract voltage drop in load leads from specified output voltage rating Note 1 For Performance Specifications see e Table L 1b 22 General Information Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table 1 2b Supplemental Characteristics for Series 665xA continued Agilent 6572A Agilent 6573A Agilent 6574A Agilent 6575A 6571A Up to 5 identical models Analog Programming IP amp VP Input Signal VP Input 0 to 4 72 V 0 to 4 24 V 0 to 4 25 V 0 to 4 24 V Oto 3 97 V IP IP Differential Oto 7 97V
66. mation refer to the following applicable paragraph Series 654xA and 655xA Supplies e On Series 654xA e strip the end of each load wire and secure it to the appropriate terminal using the screw provided on the terminal e On Series 655xA e strip the end of each load wire and fasten a suitable terminal lug to the end e using the screws provided on the output bus bars attach the wire terminal lugs to the bus bars Series 657xA Supplies e strip the end of each load wire and fasten a suitable terminal lug to the end e make a suitable opening in the output safety cover by removing one or more cover knockouts see Figure 4 2 Do not leave uncovered holes in the safety cover If too many knockouts have been removed install a new cover see Table 1 3 e feed the wires through the safety cover e using the screws provided on the output bus bars attach the wire terminal lugs to the bus bars Analog Connector The rear panel has a 7 pin analog connector with quick disconnect plug see Figure 4 3 for making the following optional connections e remote sense leads e an external current monitor e an external programming voltage source e connecting two or more power supplies in auto parallel User Connections and Considerations 39 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com OUTPUT SAFETY COVER OUTPUT TERMINALS ANALOG CONNECTOR OUTPUT SENSE SWITCH
67. n The power supply is shipped with these jumpers connected 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 3 Connect the sense leads carefully so that they do not become open circuited If sense leads are left open during operation the supply will regulate at the output terminals instead of at the load Remember to bundle or tie wrap the load leads to minimize inductance and reduce noise pickup CV Regulation The voltage load regulation specification in Performance Specifications applies at the output terminals of the power supply When remote sensing this specification must be compensated as follows Series 654xA and 655xA Supplies Add 3 mV to the voltage load regulation specification for each 1 volt change in the positive load lead due to a change in load current Because the sense leads are part of the supply s feedback path keep the resistance of the sense leads at or below 0 5 Q to maintain the above specified performance Series 657xA Supplies Add an increment to the voltage load regulation specification as specified by AmV in the equation given under Load regulation in Table 1 2b Output Rating The rated output voltage and current specification in Performance Specifications applies at the output terminals of the power supply With remote sensing any voltage dropped in the loa
68. nd of the cord Installation of the power cord must be done by a qualified electrician and in accordance with local electrical codes See Figure 2 2 and proceed as follows 1 If they are not already in place position the strain relief connector 11 power safety cover 5 rubber boot 9 and connector nut 8 on the power cord 7 2 Secure the ground connection wire 2 to the chassis earth ground stud 3 Connect the neutral connection wire 1 to the N power input terminal 4 Connect the line connection wire 3 to the L power input terminal This line is fused inside the power supply 5 Position the safety cover 5 over the power input terminals and tighten the cover and strain relief connector screws 6 and 10 NEUTRAL CONNECTION blue or white GROUND CONNECTION green yellow or green LINE CONNECTION brown or black LINE VOLTAGE LABEL POWER SAFETY COVER STRAIN RELIEF CONNECTOR SCREWS 2 POWER CORD See Options Chapter 1 STRAIN RELIEF CONNECTOR NUT RUBBER BOOT POWER SAFETY COVER SCREWS 2 STRAIN RELIEF CONNECTOR m 3 4 5 6 7 8 9 O za Figure 2 2 Series 657xA Power Cord Installation Installation 29 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com rtisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Turn On Checkout Note This chapter provides a preliminary introduction
69. ngths and large load capacitances may cause your application to form a low pass filter that becomes part of the voltage feedback loop The extra phase shift created by this filter can degrade the supply s stability and result in poor transient response In severe cases this may cause output oscillations To minimize this possibility keep the load leads as short as possible and tie wrap them together In most cases following the above guidelines will prevent problems associated with load lead inductance This leaves load load lead resistance and load capacitance as the major source of reduced stability Further improvement 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 2AWG 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 phase response Note If you need help in solving a stability problem with any Series 654xA 655xA or 657xA supply contact an Agilent Service Engineer through your local Agilent Sales and Support office Series 657xA Network If a large bypass capacitor is required at the load and the load lead length cannot be reduced then a sense lead bypass network may be needed to ensure stability see Figure 4 5 The voltage rating of the 33 uF cap
70. nitial 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 a reasonable time to repair or replace any product to condition as warranted the Customer shall be entitled to a refund of the purchase price upon return of the product to Agilent Technologies LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer Customer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation and maintenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED AGILENT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER S SOLE AND EXCLUSIVE REMEDIES AGILENT TECHNOLOGIES SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY ASSISTANCE The above statements apply only to the standard product warranty Warranty options extended support contracts product maintenance agreements and customer assistance agreements are also available Contact your nearest Agilent Technol
71. nst unintended operation until they can be repaired by qualified service personnel Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com SAFETY SYMBOL DEFINITIONS Direct current L Terminal for Line conductor on permanently installed equipment Alternating current N Caution risk of electric shock A Both direct and alternating current A Caution hot surface Three phase alternating current A Caution refer to accompanying documents Earth ground terminal Ew In position of a bi stable push control Protective earth ground terminal KEE Out position of a bi stable push control Terminal for Neutral conductor on Off supply permanently installed equipment Terminal is at earth potential Standby supply Used for measurement and control circuits 3 Units with this symbol are not completely designed to be operated with one terminal disconnected from ac mains when this switch is at earth potential off To completely disconnect the unit from ac mains either disconnect the power cord or have a qualified electrician install an external switch El Herstellerbescheinigung Diese Information steht im Zusammenhang mit den Anforderungen der Maschinenliiminformationsverordnung vom 18 Januar 1991 Schalldruckpegel Lp lt 70 dB A Am Arbeitsplatz Normaler Betrieb Nach EN 27779 Typprufung Manufacturer s Declaration This statement is provided to comply with the requirements of th
72. of the analog connector 2 Figure 4 2 B The LS sense terminal wired to the S terminal of the analog connector C If the power supply is not wired for local sensing make the above connections using small capacity wire 22 is sufficient IV Make certain there is no load connected to the bus bars Turn On Checkout 31 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com POWER ON Checkout O Connect the power cord to the power source 2 Turn the front panel power switch to ON 1 3 Check that the power supply fan is on by placing your hand near the rear grill to feel the air flow You may also be able to hear the fan operating The power supply undergoes a self test when you turn it on If the test is normal the following sequence appears on the LCD 1 A brief star burst pattern 2 PWRONINIT for a few seconds Sees 657xA supplies only 3 The display goes into the meter mode with the Dis annunciator on and all others off Meter mode means that the VOLTS digits indicate the output voltage and the AMPS digits indicate the output current These values will be at or near zero 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 4 Press once The Dis annunciator will go off and the CV annunciator will go on Output Checkout Shifted Keys Some of th
73. ogies Sales and Service office for further information on Agilent Technologies full line of Support Programs Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com SAFETY SUMMARY The following general safety precautions must be observed during all phases of operation of this instrument Failure to comply with these precautions or with specific warnings elsewhere in this guide violates safety standards of design manufacture and intended use of the instrument Agilent Technologies assumes no liability for the customer s failure to comply with these requirements GENERAL This product is a Safety Class 1 instrument provided with a protective earth terminal The protective features of this product may be impaired if it is used in a manner not specified in the operation instructions Any LEDs used in this product are Class 1 LEDs as per IEC 825 1 This ISM device complies with Canadian ICES 001 Cet appareil ISM est conforme la norme NMB 001 du Canada ENVIRONMENTAL CONDITIONS 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 up to 2000 meters Refer to the specifications tables for the ac mains voltage requirements and ambient operating temperature range BEFORE APPLYING POWER Verify that the instrument is set to match the available line volt
74. ology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table of Contents continued SEA AAA 41 E EE 42 Load Considerations c ko PAY ba 43 Capacitive dads iii ae 43 Hane NC 43 M kiple Loads e 44 Local Voltage Senshi sere eege EE E NE E 44 Series 654xA and 655xA Supplies siiicar a e ae E E i eer nne ren nennen 44 Series REP e SOAPPM S E asid 44 Remote Voltage iem 45 Setting Up Remote Sense Operation ssssssesssseseeeeeneeeenee nennen nennen nennen nennen rennen 45 Series 654xA and 655xA Supplies 45 Series T 45 Connecting the Sense EE 45 GV REGULATION TD P 45 Series 654xA and 655xA Supplies 45 Series E 45 OUtplt RANE NN 45 Oii Noli paa 46 Stable 46 Ns NetWOTK AAA E 46 Operating Considerations ME 47 Aut Parallel Operation iv v l rna ba a dt 47 Ewindgiclsdb wi 47 General Auto Parallel 2 ater tree ee Perte bea ke do a Ske ou Eo Eee EE caes LEES 48 Series 654xA and 655XA Auto Parallel Programming eese rennen 48 Series Operations eena e DW PUSe 49 External Voltage Control cni EEGENEN e asta Dae ERREUR vh 49 Programming Series 654xA and 655xA Supplies sss
75. onance network with the power supply s output capacitor Generally this will not affect the stability of the supply but it may cause ringing of the current in the load Ringing will not occur if the Q quality factor of the parallel resonant network is lt 0 5 Use the following formula to determine the Q of your output 1 L Q a Rint Rex i where C model dependent internal capacitance see below L inductance of the load Rex equivalent series resistance of the load Rin model dependent internal resistance see below 6541A 6542A 6543A 6544A 6545A 6551A 6552A 6553A 6554A C 4 200uF 550uF 180uF 68uF 33uF 10 000uF 1 100uF 440uF 120uF Rint 7mQ 30 mQ 50 ma 125 mQ 300 mQ 4 mQ 20 mQ 30 mQ 80 mQ 6555A 6571A 6572A 6573A 6574A 6575A C SOUF 44 000uF 44 000uF 12 000uF 7 0000F 2 100uF Rint 250 mQ 1 8 mQ 2 2 mQ 4mQ 14 mQ 30 mQ Note for Series 657xA Supplies If Q gt 0 5 inductive loads will ring with the output capacitance and be damped according to the following equation User Connections and Considerations 43 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Multiple Loads When connecting multiple loads to the power supply using local sensing use separate wires to connect each load to the output terminals see Figure 4 4 This minimizes mutual coupling effects and takes full advantage of the power supply s low output impedance Each pair of wires should be as s
76. onstant current mode IP accepts a signal see Analog Programming in Table 1 2b that produces a proportional output current from zero to full scale IP is positive with respect to IP IP may be floated up to 19 V from the Common P JP terminal which is approximately at the same potential as the output The IP input is also used for auto parallel operation as described later in this chapter VP Voltage Programming Input Allows an external voltage source to program CV constant voltage mode CV is programmed with a signal see Analog Programming IP amp VP in Supplemental Characteristics that produces a proportional output voltage from zero to full scale IM Series 654xA and 655xA Current Monitor Output Monitors the output current with respect to Common P JP A 0 to 5 V signal at this output indicates a zero to full scale current IM is also used when connecting supplies in autoparallel for increased current output see Auto Parallel Operation IM Series 654xA and 655xA Current Monitor Input Connects to Common P JP when connecting supplies in autoparallel for increased current output see Auto Parallel Operation Series 657xA Current Monitor Output Monitors the output current with respect to Common P JP A signal see Current Monitor IM in Table 1 2b at this output indicates a zero to full scale current IM is also used when connecting supplies in autoparallel for increased current output see Auto Parallel O
77. or each type of power source Maximum AC Line Current Ratings in Table 1 2a shows the required current load The line fuse is located in a fuseholder on the rear panel see Figure 2 1 The Line Fuse label on the rear panel shows the fuse value used in the power supply and Table 1 4 identifies the replacement fuse LINE FUSE 2 POWER RECECPTACLE mum 3 LINE AND FUSE RATING LABEL Fuse OD Figure 2 1 Series 654xA and 655xA Power Connection Series 657xA Input Source and Line Fuse You can operate your supply from a nominal 200 or 230 volt single phase ac power source as indicated on the rear panel Line Rating label See AC Input Ratings in Table 1 Ib for the voltage and frequency range for each nominal power source Maximum AC Line Current Ratings in Table 1 2b shows the required current load 28 Installation Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Note The power source must be a dedicated line with no other devices drawing current from it The line fuse is located inside the power supply Table 1 4 identifies the replacement fuse See In Case of Trouble in Chapter 3 for instructions on fuse replacement Installing the Power Cord The power cord supplied with power supply may or may not include a power plug see Options in Chapter 1 at one end of the cord Terminating connections and a ground lug are attached to the other e
78. or the type of outlet specified for your location If the appropriate cord was not included contact your nearest Agilent Sales and Support office see end of this manual to obtain the correct cord Your power supply cannot use a standard power cord The power cords supplied by Agilent CAUTION Technologies have heavier gauge wire Series 657xA Only These power supplies also include output hardware screws with nuts and lockwashers for securing your load wires to the output bus bars see Table 1 4 Manual Change Page If applicable change sheets may be included with this manual If there are change sheets make the indicated corrections to this manual Location and Cooling Bench Operation The Supplemental Characteristics in Chapter 1 give the dimensions of your power supply The cabinet has plastic feet that are shaped to ensure self alignment when stacked with other Agilent System II cabinets The feet may be removed for rack mounting Your power supply must be installed in a location that allows sufficient space at the sides and rear of the cabinet for adequate air circulation Minimum clearances are inch 25 mm along the sides Do not block the fan exhaust at the rear of the supply Rack Mounting The power supply can be mounted in a standard 19 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 Instrument support rai
79. order to reach these test points The shield is secured by four screws on each side When the voltmeter indicates 60 volts or less it is safe to work inside the power supply Replace the fuse with one of the same type see Table 1 4 in Chapter 1 Do not use a slow blow type fuse If you removed it in step b be sure to replace the RFI shield VII Replace the dustcover VIN Connect the line cord to the power source IX Turn on the front panel power switch and check the operation 1 POWER FUSE 2 LINE FILTER 3 REAR OF POWER SUPPLY Figure 3 1 Series 657xA Line Fuse Error Messages Power supply failure may occur during power on selftest or during operation In either case the display may show an error message that indicates the reason for the failure 36 Turn On Checkout Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Selftest Errors When a selftest error occurs it prevents all front panel operation The display may show either a power on error message or a checksum error message Power on Error Messages Power on messages appear as Where n is a number listed in Table 3 3 If this occurs turn the power off and then back on to see if the error persists It is possible to recover from the EE CHKSUM error see Checksum Errors If any other message persists the power supply requires service Table 3 3 Power on Selftest Errors Dis
80. ot in a valid range the entry will be ignored and OUT OF RANGE appears on the display Figure 5 2 shows the general response of a typical power supply Note that the Series 654xA and 655xA supplies have a small negative current area This is for downprogramming purposes Always keep the output current within the positive area and within the boundaries of the particular operating line for the specified mode of operation CV or CC Establishing Initial Conditions Set the power supply to the following conditions by pressing the specified keys as required Zero voltage output 0 Minimal current output O 5 Dis annuciator off If needed OCP annunciator off If needed Prot annunciator off If needed 56 Front Panel Operation Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Vs Voltage Setting s Voltage Setting Is Current Setting Is Current Setting Re Crossover Resistance Rc Crossover Resistance Is Is V out V out CV Operating Line CV Operating Line RL gt Re RL Rc V max V max Crossover Resistance Crossover Resistance CC Operating Line CC Operating Line Di Ro Tout 0 2 Imax 0 Is Imax 0 Is a Series 654xA and 655xA Supplies b Series 657xA Supplies Tmax Figure 5 2 Typical Power Supply Operating Curve Programming Voltage To program the output for 4 5 volts proceed as follows B Press Voltage
81. otan dwe kan ab pen Ra in ke BWE ede Bwa K 40 L load CAPACHAN E 43 ent EE 59 UMPC AD CC HH 13 erte c 43 IECIT 51 II 13 D 89151 L EE 44 EE 54 local sense switch see switch sense IG ET M 31 44 FES terminals ER T Hc Ho eee 31 44 45 M manual change ET 27 DO A arca 11 25 N NO GPIB message ita ii lali 54 O L EE 12 55 59 L EE 48 59 key 5 2 5 7 e IR 38 OD eene EE 12 55 output characteristic ee 13 18 23 56 uiua c HR 19 20 24 44 ipie RT 42 nt E ME R 46 A TET NP 46 47 50 LC Mp Lom 12 46 PUD SUG A n 43 Stability 43 46 Index 71 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Dee 34 55 60 OV e a EE 12 33 55 58 overcurrent protection see OCP overvoltage protection see OVP ee 55 ee 65 OVP and battery CHALLING EE 51 And Been 51 and RE 51 AP E sonb bi vo pesonn na bes ane kone b da kouns ki ae an ke Yo Ya yen oak bi ao pott sonb VRE ao ouap sekl
82. peration Common P Series 654xA and 655xA JP Common Return Provides the common connection for the IP and VP programming inputs and the IM current monitor output Common P Series 657xA JP Common Return Provides the common connection for the VP programming input and the IM current monitor output ES Series 654xA and 655xA Remote Sense Inputs Connects the load sense input leads to the power supply when the rear panel Remote Sense switch is in the Remote position see Remote Sensing ES Series 657xA Sense Inputs Connects the power supply sense input to either the LS and LS terminals for local sensing see Local Voltage Sensing or to the load for remote sensing see Remote Voltage Sensing After you have finished making the analog connections insert the plug back into the analog connector and replace the output safety cover Wire Size Selection The minimum wire size required to prevent wire overheating still may not be large enough to maintain a small enough load lead voltage drop for good electrical performance See Remote Sensing and OVP Considerations for more information on this topic Table 4 2 gives the wire resistance for various stranded sizes to help you determine load lead drop Fire Hazard To satisfy safety requirements load wires must be heavy enough not to overheat when carrying the maximum short circuit current of the power supply User Connections and Considerations 41 Artisan Te
83. play Failed Test ic cara El E2 Front Panel ROM checksum Secondary ambient thermistor reading 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 Wi Excessive number of write cycles to an EEPROM see Supplemental Characteristics This condition which would appear only after extended use is not recoverable and requires service W Loss of ac input power during a checksum calculation This condition which is very unlikely is recoverable You may be able to recover from a checksum error 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 Erit Enter 2 PASWD will appear on the display 3 Press the number keys corresponding to the password followed by Enter The Cal annunciator will go on Note On new equipment the calibration password corresponds to the four digit model number such as 8 G S 2 See Appendix A for more information about the calibration password Turn On Checkout 37 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com 4 Save any operating state for example press 9 5 Turn the power off and then back on A normal display free of error messages should appear If not the power supply requires service Runtime Error Messages Under
84. power applied and the dc output reverse biased by an external dc source Current the supply will continuously withstand without damage a current equal to its output current rating Remote Sensing Capability Voltage Drop Per Lead Up to 1 2 of rated output voltage Load Voltage Subtract voltage drop in load leads from specified output voltage rating Load Regulation Add 3 mV to spec see Table 1 la for each 1 volt change in the output lead due to load current changes Downprogrammer Current Capability 15 Agilent 6541 Agilent 6542 Agilent 6543 Agilent 6544 Agilent 6545 5 8 A 2 5A 1 5A 0 9 A 0 75 A Agilent 6551 Agilent 6552 Agilent 6553 Agilent 6554 Agilent 6555 11 6 A 1 8 A 1 S A SA 3A Monotonicity Output is monotonic over entire rated voltage current and temperature range Auto Parallel Configuration Up to 3 identical models Analog Programming IP amp VP 0to 5 V Input Signal 10 kO nominal Input Impedance Signal source must be isolated Current Monitor Output 0 to 5 V represents zero to full scale current output Savable States 5 Nonvolatile Memory Locations 5 0 through 4 Nonvolatile Memory Write Cycles 40 000 typical Recommended Calibration Interval Safety Compliance Complies with CSA 22 2 No 231 IEC 348 UL 1244 Designed to comply with VDE 0411 RFI Suppression complies with FTZ 1046 84 Level B General Information 17 Artisan Technology Group Quality Instrumentation
85. pplies Local sensing is obtained by connecting the LS sense terminal to the S analog connector pin and the pin and the LS sense terminal to the S analog connector pin The power supply is shipped with these connections made 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 44 User Connections and Considerations Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Remote Voltage Sensing The dashed lines in Figure 4 4 illustrate a typical power supply setup using remote voltage sensing In this case the remote sense terminals of the power supply are connected directly to the load rather than to the output terminals This allows the supply to automatically compensate for the voltage drop in the load leads as well as to accurately read back the voltage directly across the load Setting Up Remote Sense Operation Series 654xA and 655xA Supplies Remote sensing is obtained by placing the SENSE switch see Figure 1 1 in the Remote position The power supply is shipped with the switch in the Local position Series 667xA Supplies Remote sensing is obtained by removing the jumpers connecting the LS sense terminal to the S analog connector pin and the LS sense terminal to the S analog connector pi
86. propriate shunt resistor see Table A 1 is the only load on the power supply 2 Select the first calibration point by pressing If the power supply is not in CC mode an error occurs 3 Read DVM and compute the first current value DVM reading divided by shunt resistance Wait for DVM reading to stabilize 4 Use Entry keypad to enter the first current value 5 Select second calibration point by pressing again 6 Read DVM and compute the second current value DVM reading divided by shunt resistance Wait for DVM reading to stabilize 7 Use Entry keypad to enter the second current value Note If one of the entered values is not within acceptable range an error occurs The power supply is now holding the new current calibration constants in RAM Display Response PASWD PASSSWD ERROR Meter mode VRDG1 WRONG MODE Meter mode VRDG2 Meter mode CAL ERROR Meter mode OVPCAL CAL COMPLETE NOT CV MODE DOES NOT CAL Meter mode IRDG1 WRONG MODE Meter mode Meter mode IRDG2 Meter mode Meter mode CAL ERROR Tf CAL DENIED appears then an internal jumper has been set to prevent the calibration from being changed See the Service Manual Tf the active password is lost the calibration function can be recovered by moving an internal jumper that defeats password protection However this also will change all calibration constants to their factory default values For more information see the Servic
87. r an explanation of shifted keys and the keypad The following procedures assume you understand how to operate the front panel keys and that the test equipment is connected Entering the Calibration Values Use the procedure in Table A 2 for entering new calibration values Saving the Calibration Constants Storing the calibration constants overwrites the existing ones in nonvolatile memory If you are not CAUTION absolutely sure that you want to store the new constants omit this step The power supply calibration constants then will remain unchanged To replace any existing calibration constants with ones you have just entered press CAL SAVED then appears on the display Changing the Calibration Password You can change the password only when the module is in the calibration mode which requires you to know the present password When in this mode proceed as follows 1 Press A 2 In response to the prompt enter the new password It can be up to 6 integers or 6 integers and a decimal point If you enter more than the permitted number of integers the extra ones will be ignored 3 AGAIN will appear on the display Enter the new password a second time When OK is displayed you have changed the password You do not have to save it Press to return to the meter mode 64 Calibration Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table A 2 Typical Calibration Procedure Action
88. ram 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 3 and Table 4 1 for an explanation of these programming input connections Programming Series 654xA and 655xA Supplies Wiring Considerations The input impedance of the analog input is 10 kQ If the output impedance of your programming source is not negligible with this programming errors will result Larger output impedances result in proportionally greater errors 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 User Connections and Considerations 49 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Em j ncm 0000000 ye External Power Source External rower Source o D Program Voltage Program Current O to 5 Volts O to 5 Volts a SERIES 654xA AND 655xA A VOLTAGE PROGRAMMING SOURCE B CURRENT PROGRAMMING SOURCE O TO 10 V C CURRENT PROGRAMMING SOURCE CURRENT PROGRAMMING SOURCE FLOATING o TO 10V MAXIMUM POTENTIAL BETWEEN IP AND 4
89. rnal voltage sources before touching components DO NOT EXCEED INPUT RATINGS This instrument may be equipped with a line filter to reduce electromagnetic interference and must be connected to a properly grounded receptacle to minimize electric shock hazard Operation at line voltages or frequencies in excess of those stated on the line rating label may cause leakage currents in excess of 5 0 mA peak SAFETY SYMBOLS The WARNING sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly WARNING performed or adhered to could result in personal injury Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met The CAUTION sign denotes a hazard It calls attention to an operating procedure or the like which if not CAUTION correctly performed or adhered to could result in damage to or destruction of part or all of the product Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT Because of the danger of introducing additional hazards do not install substitute parts or perform any unauthorized modification to the instrument Return the instrument to an Agilent Technologies Sales and Service Office for service and repair to ensure that safety features are maintained Instruments that appear damaged or defective should be made inoperative and secured agai
90. te Red Grey Figure B 2 Series 655xA Line Select Jumpers Hazardous voltage can remain inside the power supply even after it has been turned off This procedure should be done only by qualified electronics personnel Provisions for converting the operating line voltage are provided inside the power supply These provisions are YN Oo L a 68 Turn off the ac power and disconnect the power cord from the power source Remove the four screws securing the carrying straps and dustcover Spread the bottom rear of the dustcover and pull it back to disengage it from the front panel Slide the dustcover back far enough to expose the line select switch see Figure B 3 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 Connect a de voltmeter across test points TP1 and TP2 It may be necessary to remove the RFI shield in order to reach these test points The shield is secured by four screws on each side When the voltmeter indicates 60 volts or less it is safe to work inside the power supply Locate the line selector switch and slide it to the desired position If you removed it in step 6 be sure to replace the RFI shield Replace the dustcover 1 FRONT OF SUPPLY 2 une SELECTOR SWITCH a TRANSFORMER 4 INPUT RAIL LED s tesrromts E R
91. the OVP trip function The normal procedure is to calibrate voltage first then current However you do not have to do a complete calibration each time If required you may calibrate only the voltage or the current and then proceed to Saving the Calibration Constants If you want to calibrate the OVP trip function the power supply will do it automatically via firmware and store the OV calibration constant The voltage output must be in calibration before the OV trip voltage is calibrated Calibration 63 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Equipment Connections For voltage calibration e Disconnect all loads from the power supply e Connect the supply for local sensing see Figure 4 1 or Figure 4 2 e Connect a DVM across the output terminals For current calibration e Disconnect all loads from the power supply e Connect the appropriate shunt resistor across the output terminals see Table A 1 e Connect a DVM across the sense terminals of the shunt resistor For OVP Calibration e None The firmware performs the calibration based on the voltage calibration constants Note You can exit the calibration procedure at any time without changing the existing calibration constants To do this press Cal Disable Performing The Calibration Seven shifted keys and the Entry keypad are used for calibration functions See Chapter 5 Front Panel Operation fo
92. the output impedance of your programming source is not negligible with this programming errors will result Larger output impedances result in proportionally greater errors Note from Figure 4 3 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 sure that the common connection for your voltage programming source is isolated from the load CAUTION Failure to do this may cause damage to the power supply OVP Considerations Remote Sensing The OVP circuit senses the voltage near the output terminals and not at the sense terminals Depending on the voltage drop between the output terminals and the load the voltage sensed by the OVP circuit can be significantly higher that that actually being regulated at the load You must program the OVP trip high enough to compensate for the expected higher voltage at the output terminals Battery Charging The power supply s OVP circuit contains a circuit that discharges the output of the supply whenever the OVP trips If a battery or other external voltage source is connected across the output and the OVP is inadvertently triggered or the output is programmed below the battery voltage the power supply will continuously sink a large current from the battery This could damage the supply To avoid this insert a reverse blocking diode in series with the output of
93. tion 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 information The product herewith complies with the requirements of the Low Voltage Directive 73 23 EEC and carries the CE marking accordingly Supplemental information The product conforms to the following safety standards TEC 1010 1 1990 A1 A2 EN 61010 1 1993 A2 UL 3111 1 1994 UL 1244 CSA C22 2 No 1010 1 1993 April 10 2001 hi Date Hank Kowalla Quality Manager at PPPGU For further information please contact your local Agilent Technologies sales office agent or distributor Authorized EU representative Agilent Technologies Deutschland GmbH Herrenberger Stra e 130 D71034 B blingen Germany Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com yh DECLARATION OF CONFORMITY C s Nn amies Gen According to ISO IEC Guide 22 and CEN CENELEC EN 45014 Responsible Party Alternate Manufacturing Site Manufacturer s Name Agilent Technologies Inc Agilent Technologies Malaysia Sdn Bhd Manufacturer s Address 140 Green Pond Road Malaysia Manufacturing Rockaway New Jersey Bayan Lepas Free Industrial Zone PH III 07866 11900 Penang U S A Malaysia declares that the Products Product Names a Single Output 2 000 Watt System dc Power Supplies b Single Output 2 000 Wa
94. to the power supply front panel See Chapter 5 for more details Introduction Successful tests in this chapter provide a high degree of confidence that the power supply is operating properly For complete performance and or verification tests refer to the service manual see Table 1 4 in Chapter 1 Do not connect the power cord to the power source until told to do so CAUTION p p Preliminary Checkout Series 654xA and 655xA Power Supplies If required see Figure 2 1 in Chapter 2 and Figure 4 1 in Chapter 4 for parts locations I Make certain that the front panel switch is off IL Examine the Line And Fuse Rating label 3 Figure 2 1 A Verify that the line voltage rating agrees with your power source If it does not see Appendix B B Usea screwdriver to remove the line fuse from the fuseholder 1 Figure 2 1 Verify that the fuse is as specified on the label Replace the fuse III Check that the SENSE switch 4 Figure 4 1 is set to Local IV Make sure that there is no load connected to the output and terminals 2 Figure 4 1 Series 657xA Power Supplies I Examine the Line Voltage label 4 Figure 2 2 and verify that the line voltage rating agrees with your power source If it does not see Appendix B IL Remove the output safety cover 1 Figure 4 2 III Examine the output sense terminals 4 and 5 Figure 4 2 They should be wired for local sensing as follows A The LS sense terminal wired to the S terminal
95. tput current or program setting Provides the same function as the and keys 3 SYSTEM Keys Not used Not used Not used Press to restore a previously saved power supply state Use ENTRY keys 0 through 4 to specify which location to recall Select by pressing Recall Use the ENTRY keys to specify the location where you want to store the state You may use locations 0 to 4 Note Location 0 may contain the power supply turn on state See Turn On Operation in this chapter Use to save the power supply s present state to nonvolatile memory Select by pressing Recall Use the ENTRY keys to specify the location where you want to store the state You may use locations 0 to 4 This unlabeled blue key is the Shift key Press to access the shifted alternate key functions These keys function only with the corresponding models of GPIB System family of power supplies Pressing them causes NO GPIB to be displayed 54 Front Panel Operation Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table 5 1 Front Panel Controls and Indicators continued Control or Function or Indication Indicator 4 Function Keys Output on off Press to enable or disable the power supply output This key toggles between the two states The disabled state programs the output to very low voltage and current settings Press to display the output voltage setting After pressing you m
96. tt Manually Controlled dc Power Supplies c Single Output 5 000 Watt System dc Power Supplies d Single Output 6 670 Watt System dc Power Supplies Model Numbers a 6671A 6672A 6673A 6674A 6675A b 6571A 6572A 6573A 6574A 6575A c 6680A 6681A 6682A 6683A 6684A d 6690A 6691A 6692A Product Options This declaration covers all options and customized products based on the above products Conforms with the following European Directives The product herewith complies with the requirements of 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 The product herewith complies with the requirements of the EMC Directive 89 336 EEC including 93 68 EEC and carries the CE Marking accordingly European Union As detailed in Electromagnetic Compatibility EMC Certificate of Conformance Number CC TCF 00 075 based on Technical Construction File TCF HPNJ2 dated Oct 29 1997 Assessed by Celestica Ltd Appointed Competent Body Westfields House West Avenue Kidsgrove Stoke on Trent Straffordshire ST7 1TL United Kingdom Safety information The product herewith complies with the requirements of the Low Voltage Directive 73 23 EEC and carries the CE marking accordingly Supplemental information The product conforms to the following safety standards TEC 1010 1 1990 A1 A2 EN 61010 1 1993 A2 UL 3111 1 1994 UL 1244 CSA C22 2 No 1010 1 19
97. unusual operating conditions the VOLT or AMPS display may show OL or OL This indicates that the output voltage or current is beyond the range of the meter readback circuit Table 3 4 shows other error messages that may appear at runtime Table 3 4 Runtime Errors EE WRITE ERR EEPROM status time out SBUB FULL Message too long for buffer SERIAL DOWN Failed communication with front panel STK OVERFLOW Front panel stack overflow UART FRAMING UART byte framing error UART OVERRUN Overfilled UART receive buffer UART PARITY UART byte parity error 38 Turn On Checkout Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com User Connections and Considerations Rear Panel Connections Shock Hazard Disconnect ac power before making rear panel connections Application connections are made to the output terminals and analog connector The connections are the same for Series 654xA and 655xA supplies and similar for the Series 657xA supplies Unless otherwise specified instructions in this chapter apply to all models Output Connectors The and load connections are made at the rear panel Depending on the model see Figure 4 1 or Figure 4 2 either terminals or screw down bus bars and connect the load to the power supply The general procedure is as follows 1 Remove the output safety cover 2 Connect the load wires 3 Replace the output safety cover For more specific infor
98. y ground User Connections and Considerations Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Load Considerations Capacitive Loads In most cases the power supply will continue to be stable with additional external load capacitors see the following table for Series 654xA 665xA 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 manual Series 654xA 655xA Power Supplies Maximum External Capacitance 6541A 6542A 6543A 6544A 6545A 6551A 6552A 6553A 6554A 6555A 40 000uF 20 000UF 12 000uF 7 000HF 3 000uF 100 000uF 50 000uF 30 000uF 18 000UF 8 000UF If the power supply output is rapidly programmed into capacitive loads the supply may momentarily cross into CC mode This extends the CV programming time and limits the maximum slew rate to the programmed current divided by the total internal see Inductive Loads and external capacitance These momentary crossovers into CC mode will not damage the supply Inductive Loads Inductive loads provide no loop stability problems in CV mode However in CC mode inductive loads will form a parallel res

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