Agilent Technologies 5962-8200 manuale d’uso

Service Manual For A gilent Model 6611C, 6612C, 6613C, 6614C Sy stem DC Pow er Supply For instruments with Serial Numbers: Agilent 6611C: US37450101 and up Agilent 6612C: US37460101 and up Agilent 6613C: US37460101 and up Agilent 6614C: US37460101 and up Agilent Part No. 5962-8200 Printed in U.S.A. Microf iche No 5962-8201 September , 2000[...]

2 Warranty Information CER TIFICA T ION Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory. Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Bureau of Standards, to the extent allowed by the Bureau's calibrati[...]

3 Safety Summary The f ollowin g g eneral sa f et y p recautions must be obser ved durin g all p hases o f o p eration o f this instrument. Failure to com p l y with these p recautions or with s p eci f ic warnin g s else where in this manual v iolates sa f et y standards o f desi g n, manu f acture, and intended use o f the instrument. A g ilent T[...]

4 Safety Symbol Definitions Symbol Description Direct current Alternatin g current Both direct and alternating current Three-phase altern ating current Earth (grou nd) terminal Protective earth (ground) term inal Frame or ch assis termin al Terminal is at earth potential (Used for meas urement and con trol circuits design ed to be operated with one[...]

5 Notice The information contain ed in this document is subject to change w ithout notice. Agilent Technologies m akes no warran ty of any kind with reg ard to this m aterial, including but not limited to, the im plied warranties of merch antability, and fitness f or a p articular purpose. Agilent Technologies shall not be liable for errors contain[...]

6 Table of Contents Warranty Inform ation 2 Safety Sum mary 3 Notice 4 Printing History 5 Instrument Identifi c a tion 5 Table of Cont ents 6 INTRODUCTION 9 Organization 9 Safety Considerations 9 Related Documents 9 Revis ions 10 Manual Re visions 10 Firm ware Re visions 10 Electrostatic Discharge 10 VERIFICA TION A ND PERFORMA NCE TESTS 11 Introdu[...]

7 CV/CC Status Annunci a tor s T ro uble s ho oting 34 Bias and Ref erence Supplies 34 J307 Voltage Meas urement s 35 Manual Fa n Spee d Contr ol 36 Disab ling Pr ote ctio n Featur es 36 Post-repair Calibration 37 Inhibit Calibration Switch 37 Calibration Password 37 Initialization 38 ROM Upgra de 38 Identify ing the Firm ware 38 Upgrade Procedure [...]

[...]

9 1 Introduction Organization This m anual con tains inf ormation for troublesh ooting and repai ring Ag ilent Models 6611C , 6612C, 6613C and 6614C Sy stem DC Pow er Supplies. Hereafter all m odels will be referred to as the dc power su pply. This manual is organized as follow s: Chapter 1 Organi zati on Chapter 2 Perform ance tests Chapter 3 Trou[...]

1 - Intr oduct ion 10 Rev isions Manual Revisions This manual w as written f o r d c power supplies that have the sam e manuf acturing dates (the first four digits) as those listed on the title page and w hose unique identification n umber (the last four digits) are equal to or high er than those listed in the title page. NOTE: 1) If the first four[...]

11 2 Verification and Perfo rmance Tests Introduction This document contains test p r o cedures to verify th at the dc po wer su pp ly is operating n o rmally and is w ithin published s pecifications. There are three ty pes of tests as f o llows: Built-in Self Test s These tests, run automatically when the power su pply is turned on , check most of[...]

2 - Verif icat ion and Perf orm ance T ests 12 Table 2- 1. Test Equipmen t Required f or Verificatio n and Performan ce Test s Type Specifications Recomm ended M o del Curren t Monitor Res istor 15 A (0.1 oh m) 0.04% Guil dline 9230/15 DC Pow er Supply Minim um 5 A outpu t current ratin g Ag ilent 6632B Digital Voltmeter Resolution: 10 nV @ 1V Read[...]

Verification and Per f ormance T ests - 2 13 Figure 2-1. T est Setu p Electronic Load Many of the test procedures requ ire the use of a v ariable load capable of dissipating the required power. If a variable resistor is use d, switches should b e used to e ither; co nne ct, disc onnect, o r shor t the load resistor . For most tests, a n electronic [...]

2 - Verif icat ion and Perf orm ance T ests 14 Current-Monitoring Resistor To eliminate outpu t-current m easuremen t error caused by v o ltage drops in the leads and con nections, connect th e current m onitoring resis tor between the - OUT and the load as a four-term inal device. Con nect the current- monitoring leads inside th e load-lead connec[...]

Verification and Per f ormance T ests - 2 15 Constant Voltage (CV) Tests CV Setup If m ore than one meter or if a m eter and an oscilloscope are used, connect each to the term inals by a separate pair of leads to avoid m utual coupling ef fects. For constant voltage dc tests, connect on ly to +S and -S, s ince the unit regulates the output voltage [...]

2 - Verif icat ion and Perf orm ance T ests 16 CV Source Effect This test measures the ch ange in output voltage that results f ro m a change in ac lin e voltage from the m inimum to maxim um v alue within th e line voltage specifications. a. T urn o ff the sup ply and conne ct the ac p ower li ne thro ugh a var iab l e vol tage t r ansfo r mer. b.[...]

Verification and Per f ormance T ests - 2 17 tttt t v Loading Transient Unloading Transient v t Figure 2-2. T ransient Wavef orm a. Turn off the supply and connect the output as in Figure 2-1a w ith the oscilloscope across the +S and -S termin als. b. Turn on th e supply and program t he output cu rrent to the m aximu m program mable v alue (Imax )[...]

2 - Verif icat ion and Perf orm ance T ests 18 c. Divide the v oltage drop (DVM reading) across the cu rrent monitorin g resistor by its resistance to conv ert to amps and record this value (Iou t). Also, record the curren t reading on the f ront panel display. The readin gs should be with in the limits specified in th e p erformance test record ca[...]

Verification and Per f ormance T ests - 2 19 CC Load and Line Regulation These tests (CC Load Effect and C C Source Effect gi ven below) are tes ts of the dc regu lation of the pow er supply' s output cu rrent. To insure that the valu es read are not the instantan eous meas urement of th e ac peaks of the outpu t current ripple, s everal dc me[...]

2 - Verif icat ion and Perf orm ance T ests 20 CC Source Effect This test measures the ch ange in output current that resu lts when th e AC line voltage chang es from the m inimum to the m aximum value within the specifications. a. T urn o ff the sup ply and conne ct the ac p ower li ne thro ugh a var iab l e vol tage t r ansfo r mer. b. Connect th[...]

Verification and Per f ormance T ests - 2 21 Performance Test Equipment Form Test Facility: _________________________ Report Nu mber ________________________ ____________________________________ Date _________________________________ ____________________________________ Cus tomer _____________________________ ____________________________________ Te[...]

2 - Verif icat ion and Per f ormance T ests 22 Performance Test Record Form Model Agilent 6611C Report No _______________ Date __________________ Test Description Minimum Specs. Results* Maximum Specs. Measurement Uncertainty Constant Vo lt a ge Tests Voltage Program min g and Readback Low Voltage (0V) Vout Front Panel Display Readback High Volta g[...]

Verification and Per f ormance T ests - 2 23 Model 6612C R eport No _______________ Date __________________ Test Description Minimum Specs. Results* Maximum Specs. Measurement Uncertainty Constant Vo ltage Test s Voltage Program min g and Readback Low Voltage (0V) Vout Front Panel Display Readback High Vo ltage ( Full Sc a le) V out Front Panel Dis[...]

2 - Verif icat ion and Perf orm ance T ests 24 Model Agilen t 6613C Report No _______________ Date __________________ Test Description Minimum Specs. Results* Maximum Specs. Measurement Uncertainty Constant Vo ltage Test s Voltage Program min g and Readback Low Voltage (0V) Vout Front Panel Display Readback High Vo ltage ( Full Sc a le) V out Front[...]

Verification and Per f ormance T ests - 2 25 Model Agilen t 6614C Report No _______________ Date __________________ Test Description Minimum Specs. Results* Maximum Specs. Measurement Uncertainty Constant Vo ltage Test s Voltage Program min g and Readback Low Voltage (0V) Vout Front Panel Display Readback High Vo ltage ( Full Sc a le) V out Front P[...]

[...]

27 3 Troubleshooting Introduction WA RNING: SHOCK HA ZA RD. Most of the troubles hooting procedures g iven in this ch apter are perform ed wit h power applie d and protective covers removed. Su ch main tenance sh ould be perform ed only by service trained pers onnel w ho are aware of the hazards (for exam ple, fire and electrical shock ). CA UT ION[...]

3 - Tr oubleshoot ing 28 Test Equipment Required Table 3-1 lis ts the test equ ipment required to troubles hoot the pow er supply . Recomm ended m odels are listed. Table 3-1. Test Equipment Required for T roubleshooting Type Purpose Recomm ended M odel GPIB Controller To commu nicate with the supply v ia the GPIB interface HP Series 200/ 300 Digit[...]

Troubleshoot ing - 3 29 Figure 3-1 She et 1. Troubleshooting Flowchart T urn on un i t an d obs erv e t h e dis pl ay. A ll of t h e s eg m ents an d an nu nc i at ors , th e ad dr ess and then after s elf t e s t should displ ay an er r or mess age or go to t he me t e ring mode . Disp lay comes on? +5V @ A2J 211-1 (t o cha ssis)? Re p l a ce A 3 [...]

3 - Tr oubleshoot ing 30 Figure 3-1 She et 2. Troubleshooting Flowchart En abl e out pu t an d pr ogr am v olt ag e an d curr ent f ull s c ale with n o load. Meas ur e ou tp ut vol t age. Uni t OV' s? Fr om S h eet 1 Go t o S h eet 3 Outp ut v olt ag e > 10% e rro r? Che ck to in sure O V se ttin g i s no t le ss tha n the volt age s etti [...]

Troubleshoot ing - 3 31 Figure 3-1 She et 3. Troubleshooting Flowchart Fr om S h eet 2 Pr o g r am c ur r en t t o f ul l scale, vo lt age to V m ax and load to the po we r supply's rate d curre n t. Supply sho uld be in C C. W il l not go i nto CC or er r o r > 10% ? Ou tput ou t o f spe c but clo se? G ot o S h eet 4 Re place A2 Ca l i b [...]

3 - Tr oubleshoot ing 32 Figure 3-1 She et 4. Troubleshooting Flowchart From S heet 3 Connect controller to the HP IB port and s end com m ands to s et the output v oltage and current and readback the output. Accepts and reads back? Rep lace A 2 No Run the P erform ance T est in Ch apter 2. Ye s Pas ses tes t? Regulat ion, Transient Respons e a nd [...]

Troubleshoot ing - 3 33 Specific Troubleshooting Procedures Power-on Self-test Failures The power-on self- test seq uence tests most of the digital and DAC circu its. If the supply fails self- test, the display " E RR" annunc ia tor will come on. You c a n the n q uery the unit to find o ut what the err o r(s) a re. When an error is detec[...]

3 - Tr oubleshoot ing 34 E221 Front Panel comm UART framing error A3 Front Panel/Display Bd E222 Front Panel comm UART p a rity error A3 Front Panel/Display B d E223 Front Panel firmw are inpu t buff er overrun A3 Fron t Panel/Di splay Bd CV/CC Status A nnunciators Troubleshooting The CV/CC annunc iato rs ar e pa rti c ular l y help ful when tro ub[...]

Troubleshoot ing - 3 35 J307 Voltage Measurements Cable W9 conn ects J307 of the A1 Main Board Assem bly to J207 of the A 2 Interface As sembly . T able 3-4 provides a quick method of determin ing if the voltages betw een these assemblies are w ithin the norm al range. If an y of these voltages is outside th e normal range, refer to the f lowcharts[...]

3 - Tr oubleshoot ing 36 Manual Fan Speed Control Under som e circumstan ces such as testing acoustical devices w here the fan n oise would interf ere with the test, it w ould be advantageou s to reduce the fan speed. If the test requires a v ery light load, the ambient temperature is low and the duration of the test is short, the f an speed may be[...]

Troubleshoot ing - 3 37 Post-repair Calibration Calibration is re q uired annually and wh enever cer tain co mponents are replaced. I f either A1 or A2 are replaced, the supply mu st be re-calibrated as described in A ppendix B of the User' s Guide. If the Interf ace bo ard A2 is replaced, the supply m ust be initialized first (see "Initi[...]

3 - Tr oubleshoot ing 38 Initialization The dc pow er supply' s GPIB address and m odel num ber as w ell as other con stants w hich are requ ired to program and calibrate the supply are stored in a EEPROM on th e A2 Interface board. The Interf ace board also contains referen ces and other components that w ill affect the align ment of the su p[...]

Troubleshoot ing - 3 39 Disassembly Procedures The follow ing parag raphs provide in structions on how t o disassem ble various com ponents of the dc pow er supply . Once disas sembled, th e componen ts can be reassem bled by perf orming the disass embly instructions in reverse or d er. Figure 3-2 show s the location of the major components of the [...]

3 - Tr oubleshoot ing 40 Cove r, Removal and Replacement a. Using a T15 Torx screw driver, unscrew the two captiv e screws w hich hold th e rear bezel to the dc pow er supply, and th en remove th e two screw s from the bottom of th e case. b. Slide the cover backward un til it clears the rear of the power supply . A 2 Interface Board, Removal and R[...]

Troubleshoot ing - 3 41 A 3 Front Panel Board, Removal and Replacement First remove th e front panel assembly as described under, "Front Panel Assembly , Removal and Replacem ent." Once you hav e access to the front pan el board perform these s teps: a. Remove the RPG kn o b by pulling it aw ay from the front panel. b. Pull back the right[...]

3 - Tr oubleshoot ing 42 Line Voltage Wiring Figure 3-3 illustrates the prim ary wirin g configuration of the pow er transformer for various ac line v oltages. Use long nose pliers to disconnect the w ires going to the transformer term inals. NOTE: Install the correct f use wh en changing the ac line voltage from a previous setting : for 110/120 Va[...]

43 4 Principles of Operatio n Introduction This section describes the different fun ctio nal circuits used in the dc power supply . First, the I/O external sign als that connect to the A gilent pow er supply are described. Nex t, the overall block diagram s for the dc pow er supply are des cribed in detail. The sim plified block di agrams f ound in[...]

4 - Principles of Operat ion 44 A 3 Front Panel Circuits As s hown in Figure 6-3, the su pply's f ront panel assem bly contains a circu it board, a keypad, a display , and a rotary control (RPG) for the outpu t voltage and current. With the ex cep tio n of the RPG (A3G1), the A3 Front Panel board is an as sembly -level replaceable part. A sepa[...]

Principles of O per ation - 4 45 The EEPROM (electrically erasable prog ramm able read-only m emory ) chip on the A2 in terface board stores a variety of data and config uration information. This inform ation includes calibration constants, GPI B ad dr ess, p rese nt pr o gramming language , and model-d epe ndent d ata , such as t he minimum a nd m[...]

4 - Principles of Operat ion 46 As show n in Figure 6-2, the ac in put rectifier and filter converts ac input to a dc level. The output regul ato r regulates this dc level at th e o utput of the power supply . T he output regulator stage consists of tw o parallel NPN series regulators mounted on a heatsink and con nected between th e +Rail and the [...]

Principles of O per ation - 4 47 When the dow nprogram ming s tage is turned on (in either CV or CC m ode), the CV/CC con trol circuit causes the Control signal to go low , which in tu rn causes the downprogram ming transistors to conduct current aw ay f rom the load and s peed up downprog rammi ng. During operation, a PM_Inhibit signal w ill cause[...]

[...]

49 5 Replaceable Parts L ist Introduction This section lists the replaceable parts for all models. Refer to Fig ures 5-1 and 5- 2 for the location of mechanical parts w ith the reference designators MP. Table 5- 1. Chassis, Electrical Design ator Part_Num ber Qty Descri ption A1 06611-61024 1 6611C Con trol PCA A1 5063-3497 1 6612C Con trol PCA A1 [...]

5 - Replaceable Parts List 50 W-3 5063-4825 1 Secondary Pow er Cable (T1 to J306) W-4 5063-3479 1 Secondary Bias Cable (T1 to J305) W-5 5063-3481 1 Output C able (EB315/ER315 to fron t panel) W-6 5063-3478 1 P rim ary Bias C able (T1 to J303) W-7 5080-2544 1 Display Power/Com m C able (A2 to A 3) W-8 5080-2452 1 Interf ace Po wer Cable (E320/321 to[...]

Replaceable Parts List - 5 51 Figure 5-1. M echan ical Parts Identif ication[...]

5 - Replaceable Parts List 52 Table 5- 2. Chassis, M echanical Design ator Part_Num ber Qty Descri ption MP1 5001-9873 1 Chass is MP2 5063-3413 1 Fron t Panel MP3 5040-1723 1 Side Brack et, Right MP4 1400-0977 2 Batte ry Clip MP5 1510-0091 2 Bin ding Pos t MP6 0590-0305 2 Hex Nut 6-32 w /Lockw asher MP7 33120-87401 1 Knob MP8 06611-40008 1 Window ([...]

53 6 Diagrams Introduction This chapter contains draw ings and diagram s for troubleshooting and main taining the Ag ilent Model 6611C, 6612C, 6613C and 6614C Sy stem DC Power Su pplies. Figure 6-1. A 1 Board Component and Test Point Locations Sec Common -Rail +Rai l J307 +15Vs -15Vs +5Vs F310 R431 D307 D330 +5Vp ( unr eg) Pri C ommon F31 1 F308 F3[...]

6 - Diagr am s 54 Figure 6-2. A1 Board Block Diagram[...]

Diagram s - 6 55 Figure 6-3. A2/A 3 Boards Block Diagram[...]

6 - Diagr am s 56 Figure 6-4. Rail and Bias Circuits J304 Red Blac k 1 2 1 3 + RAIL - RA IL RAIL_CT J305 F306 F303 1 2 3 +15V Sec -15V Sec T o F a n C i rc ui t +5V Sec Sec Co m U 304 U307 U 306 J303 F305 1 2 U 305 Pri Com +5 V Pr i E321 E320 E324 Black Red Wh ite 8V ac 8V ac 20V a c + 26V +5Vp U nreg 3 2 1 4n u J20 6 J21 1 5V A2 A3 8 7 6 5 4 3 2 1[...]

57 Index —+— +OUT, 43 +sense, 43 —A— A1 block diagram , 54 A1 boar d remova l, 41 A1 Main boa rd, 45 A1 test point locations , 53 A2 boar d remova l, 40 A2 Interface Board, 44 A2/A3 block diagram , 55 A2S201 , 45 A3 boar d remova l, 41 A3 Front Panel, 44 ADC , 4 4 —B— bias volta ges, 34, 35 —C— cal de nied, 37 calibration, 37 calibr[...]

Index 58 —M— ma nual revisi ons, 10 —N— noti ce, 5 —O— -OUT, 43 out of ra nge, 37 OV_Dete ct* , 44, 47 OV_Prog , 45 OV_SCR* , 44, 46 —P— PARD, 16, 20 passw ord, 37 perf ormance test form , 21 perf ormance tests, 14 PM_Inhibit , 47 powe r-on self-t est, 33 primary interface, 44 printing, 5 progra mm ing, 14 programming and output val[...]