DUAL OUTPUT POWER SUPPLY Agilent MODEL E3620A
Contents
1. Mrenka DES te FO TP1 U16 LABEL ve 3 C Meter Select Circuit D INP OUT SV_D UF 4204 COM 6 MC78 5CT R54 122 26 ve t c24 He j R53 T 1 u 4 z 1 54k ui7 754 a TPS J1 6 EE s R52 HIS CURRENT 4 5V_ gt J1 8 3 4K 5V_D J1 1 V 2 gt J1 9 Vi 25 SIS Ver 33 T C27 V2 V 3 3 u VOLTAGE ae gt J1 11 P LABEL CR18 lt INP OUT SV D Se UF 4 Y VR SV D J1 1 LM32 T 5 1 gt 21 2 3 O VI Wiehe 08 amp Reference Circuit VA2 12V1 TP13 U23 LABE i NC VR 1 NC INP OUT 6 NC 8 SOM R79 LM34 T T2 EIES dd T cui pe DF 1 eo T 10 as U22 9 c39 T G LM336BZ EG lu 3 12V1 2 E U21 Vat 10 GN U18A HLE C32 Er 1u 2 8 33u 3 5V1 4H7 u 10 5 1 11 gt J1 4 R73 LABEL Eda LM393 PENAN 2k 2 4 INP OUT 12V1 VR 5v1 MC7912CT aaah R67 2 15M HI 1 CR7 R66 R65 N N o o D vi eves NAG Os Jo TPZ z K Lk LABEL UFH Y 02 O 0 a NNN OUTPUT1 12V1 Kl 16 RSS 1 78 NC NC R7 R62 0058 3 Pil 1 CW Al 09 R63 562k a R64 P 1 2N29 7A 1 2K Mr R57 c34 25k T 1u U19A R68 2 R59 1 87K U18B 5 62k soi SV1 CR19 R61 7 103 1 K 5 25 CR24 1K 700 2 12V12. GND for Display RECTIFIER FILTER AND PREREGULATOR 1 PREREGULA CONTROL REFERENCE AND BIAS SUPPLY Figure A 1 Block Diagram PRINCIPLES OF OPERATION Block Diagram Overview This section presents the principles of operation for the E3620A Dual Output Power Supply Throughout this discus sion refer to both the block diagram of Figure A 1 and the schematic of Figure A 10 and Figure A 11 The E3620A contains two independent power supplies des ignated V1 and V2 common input power circuit and meter circuit that can monitor the output voltage and current of either supply The two primary windings of the power transformer are con nected in one of three different ways by setting the two slide switches mounted on the circuit board These switches select one of the nominal ac input voltages for which the supply is designed 100 V 115 V or 230 V The transformer secondar ies together with rectifiers and capacitor filters provide raw for two output regulator circuits for two reference and bias A 1 supplies and for a display power supply By comparing its output to a high stability reference the V1 supply s 0 to 25 V regulator holds its output voltage at the value determined by the V1 VOLTAGE control of the front panel
3. Table A 11 Replaceable Parts List cont d Agilent PART NUMBER 280 0698 4002 0811 2188 0757 1097 0811 3861 R33 72 0698 6250 R31 68 0698 4429 R 0698 3160 0699 0069 826 1075 826 1297 901 1149 884 036 5 R5 62K 1 31 6K TR FXD POS D D C COMPARATOR GP Q P LOW BIAS TRANSISTOR PNP 2N4 R 21 5 1 0 125W TF TC 0 100 pe TI 0 125W TF TC 0 100 0 125W TF TC 0 100 4 8 5 2V 0 220 IF 100MA MAX P GP DUAL 8 PIN DIP P TR V REF FXD 4 8 5 2V TO 92 PKG D vi UAD 14 PIN DIP H IMPD QUAD 4 PIN TRANSISTOR PNP 2N2907 SI 0 18 PD 400MW 036 SI TO 5 PD 1W DIODE PWR RECT 400 V 1A 50NS 00 41 THYRISTOR TRIAC TO 220 47 47 0 GLTR FXD NEG 4 8 5 2V TO 220 PKG 104713 7905 GLTR FXD POS 11 5 12 5V 0 220 PKG 047 LTR MC7812CT d GLTR FXD NEG 11 5 12 5V TO 220 04713 7912 OPTO ISOLATOR LED TRIAC C COMPARATOR PRCN DUAL 8 PIN DIP P P 28480 BTA06 600B Table A 11 Replaceable Parts List cont d REFERENCE Agilent PART Q TY DESCRIPTION MFR MFR P N DESIGNATE NUMBER CODE CR8 9 10 11 12 14 15 21 22 1901 0033 14 DIODE GEN PRP 180V 200MA 00 35 27014 1N645 23 24 25 26 27 MISCELLANEOUS 9170 0894 0 9100
4. Any error in the actual output as compared to the desired output is amplified by an operational amplifier and applied as feedback to control the conduction of a series reg ulator transistor As a result the voltage across the series transistor varies so as to hold the output voltage constant at the desired level The high gain of the voltage comparison amplifier and the stability of the reference voltage ensure that input voltage or load current variations have little effect on the output voltage The V1 output is protected by a fixed current limit at minimum 105 of its 1 amp maximum rated output The input ac line voltage is first applied to the preregulator which operates in conjunction with the preregulator control circuit to rectify the tap switched AC voltage This preregu lator minimizes the power dissipated in the series regulating elements by controlling the dc level across the input filter capacitors depending on the output voltage To achieve this tap switching of the V1 output is accom plished by TRIAC Q5 a bridge diode CR4 two diodes CR5 and CR6 and the preregulator control circuit This circuit allows the input capacitors to charge to one of two discrete voltage levels depending on the output required When the output voltage exceeds the reference level the pre regulator control circuit fires the TRIAC Q5 that causes the input capacitors to be charged to the voltage which is neces sary for full output of the suppl
5. g Agilent Technologies DUAL OUTPUT POWER SUPPLY Agilent MODEL E3620A OPERATING AND SERVICE MANUAL Manual Part No E3620 90001 April 2000 Edition 6 SAFETY SUMMARY The following general safety precautions must be observed during all phases of operation service and repair of this instrument Failure to comply with these precautions or with specific warnings elsewhere in this manual 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 BEFORE APPLYING POWER Verify that the product is set to match the available line volt age and that the correct fuse is installed GROUND THE INSTRUMENT This product is Safety Class I instrument provided with protective earth terminal To minimize shock hazard the instrument chassis and cabinet must be connected to an electrical ground The instrument must be connected to the ac power supply 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 potential shock hazard that could result in personal injury If the instrument is to be energized via an external autotransformer for voltage reduc tion be certain that the autotransformer common terminal is co
6. 105 V Meter Calibration Voltmeters To calibrate voltmeter proceed as follows a Connect DVM across V1 and output terminal b Turn on the supply and push V1 METER switch Set the output voltage to 17 00 volts and adjust R16 on the display board until front panel VOLTS display reads exactly DVM value Next set the output voltage to 25 0 volts and adjust R17 on the display board until front panel VOLTS display reads exactly DVM value d To calibrate the voltmeter for V2 output push V2 METER switch in and connect DVM across V2 and output ter minal e Set the output voltage to 15 00 V and then adjust R81 on the main board until front panel VOLTS display reads exactly DVM value Ammeters To calibrate ammeter for V1 and V2 supplies proceed as follows a Connect the test setup shown in Figure A 6 to the output of the V1 supply Substitute a short for R and leave load circuit switch open b Push V1 METER switch in and turn V1 VOLTAGE control fully clockwise c Close the load switch and adjust R5 on the display board until front panel AMPS display reads exactly DVM value divided by Rs d To calibrate the ammeter for V2 output repeat step a to the V2 supply Select V2 METER switch and turn V2 VOLTAGE control fully clockwise e Adjust R80 on the main board until front panel AMPS dis play reads exactly DVM value divided by Rs REPLACEABLE PARTS INTRODUCTION This section contains information for
7. 3020Z IST A Z 12 2 12 P L S 1 U6B 12V2 11 R3 We 2 OND R1 3 2 432 5W 31 6k 6 12V2 R19 c8 R24 R37 562k 1u 8 06k NE as 10K 1 RUG Wie LM339N 7 U7B Va 10k 1 R14 USB 2N2222A HR T PETR cee 6 UYB 10 7 VA2 gt R12 15 S 12V2 R18 PRS he zy 12V2 7 A 31 6k LM339N 11 562K 10 LM393 6 R17 R26 6 5 1 er U6C 12k 9 8 26k l U2 x HOD 31 6k 8 14 ET Ler 2 30202 AV xe Y 14 4 M339N 8 8 R5 LF 347BN 10 3 2 432 5W EN EG R36 V U7D Q7 1 K AD R38 DE ee 10 NC 2 15k NC 13 lt 5 LM339N ie AG 3 2N2222A R39 UB ale 4 53k LM336BZ lu 2 12 2 2 Gee Agilent Technologies CERTIFICATION Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Stan dards and Technology formerly National Bureau of Standards to the extent allowed by that organization 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 software and firmware products which are designated
8. 5 Proceed to step 4 Voltage high Check U14 for V2 output or U20 for V1 output for open Voltage low Check U14 for V2 output or U20 for V1 output for short 3 Check 5V reference Normal 5V 2 Proceed to V1 supply troubleshooting Table A 5 Voltage high Check U11 for V2 output or U22 for V1 output for open Voltage low Check U11 for V2 output or U22 for V1 output for short 4 Check 5V reference Normal 5V 2 Proceed to V1 supply troubleshooting Table A 5 Voltage high Check U12 for V2 output or U21 for V1 output for open Voltage low Check U12 for V2 output or U21 for V1 output for short Table A 5 V1 Supply Troubleshooting SYMPTOM STEP ACTION RESPONSE PROBABLE CAUSE High output voltage Attempt to turn off Q2 by a Output voltage remains high Q1 shorted higher than rating shorting emitter to col b Output voltage decreases Remove short and proceed to step lector of Q10 2 Measure voltage at base of Q10 a Measured voltage is more than 0 Check for open CR8 or R48 and volt check for defective U10B b Measured voltage is less than 0 Check for defective Q6 volt Low output voltage Attempt to turn on Q2 by a Output voltage remains low Q1 open lower than rating disconnecting emitter of b Output voltage increases Re connect the emitter lead and Q10 proceed to step 2 Attempt to turn off of a Output voltage remains low Q6 shorted Q10 by shorting point b Output volt
9. E v2 p amp Reference Circuit 12v2 de U13 LABEL VR Lue OUT COM LM34 T 12 14 HUTZ c2e 5V2 12V2 smekke so 2 z C15 U9A one goiu NYE TP6 8 DF 1 LM336BZ LABEL 3 ve X 3 SE 3 2 5V2 2 NER OVL V2 V 4 C16 U12 A2 seis 1u LM336BZ c21 alle s 17 5 16 I 47Bu ST U9B SV2 U14 5 1 RS LABEL NC en 2 NC INP OUT 12v2 2 LM393 NC VR MC7912CT J1 5 DD N 00 CR1 UFH Y Va2 TP3 LABEL N Q1 h z OUTPUT2 R35 1 78 2N6 56 SW Ruu Q3 CW 750 R34 A2 2 CR2 1 1k 17 TF 2KBP 2M C12 1u U1 A R31 o R82 AVS SCB 1 87K 520 KE CRI 2 CR12 CR11 18 15 12V2 B LFYUY2 NZ 12 Ll t c2 R1 tee bes C13 1 u 1 u ev 3W Reg i 19 2KBP02M 122K s L1 R29 12V2 302 Q 5K PE 5 2 CW t cig X 5 162 Va2 70u T M 06 8 CR8 R46 20 1 75 gt C14 gt a LF442 j 3 EER ie EM S CR15 R32 AVS SCB CRI1 1 Li 21 5 V a2 R41 R48 R47 1K 1 k 102k c9 5 T 6 8u 12V2 QUTPUT2 AA id V2 Output TRIAC Control Circuit ee R2 PLENA 562k meer 12V2 U6A 3 12V2 4 Vaz 12V2 7 R15 3 12V2 lt xS 1 K x 5 12 NC LM339N 5 amp 22 13 RES R9 2 x lt 8 06k 6 ls 1 UHA 31 6k 14 12 LM339N 4 S s U1 12V2 2 LF 347BN 12 MCP
10. the V1 supply to 25 0 volts d Check that the rms noise voltage at the true rms voltme ter is less than 0 35 mV e Repeat steps a through d for the V2 supply Ry 25 ohms 100W 5 for 1 and V2 outputs Figure A 8 Ripple and Noise rms Measurement Test Setup Peak to Peak Measurement The peak to peak measurement is particularly important for applications where noise spikes could be detrimental to a sensitive load such as logic circuitry To measure the ripple and noise of the peak to peak value on each output supply output a Connect the test equipment across the output of the V1 supply as shown in Figure A 8 but replace the true rms voltmeter with the oscilloscope Turn on the supply and push the V1 METER switch in Adjust the output of the V1 supply to 25 0 volts Set the oscilloscope to AC mode and bandwidth to 20 MHz Check that the peak to peak noise is less than 1 5 mV Repeat steps a through e for the V2 supply rogoo Common Mode Current CMI Definition Common mode current is that ac current compo nent which exists between any or all supply or output lines and chassis ground To measure the common mode current a Connect the full load for the V1 output terminal b Connect 100 resistor Rg and 2200 pF capacitor in parallel between V1 terminal and chassis ground c Connect the DVM across Rg Operate the DVM in ac volt age mode on the supply e Record the volt
11. voltage from pin 6 to pin a Measured voltage is positive a U7 defective 7 of U7 b Measured voltage is negative b U5 defective Set output voltage to 19V 1V 5 Measure the voltage for pin 7 of U4 a High voltage 0 7 V a U2 or Q4 defective b Low voltage 0 V b Proceed to step 6 A 9 Table 8 V2 Preregulator Control Circuit Troubleshooting Cont d Measure the voltage for pin 14 of U6 a Low voltage 12 V a U4 defective b High voltage 12 V b Proceed to step 7 Measure the voltage for pin 14 of U7 a High voltage 12 V a U6 defective b Low voltage 12 V b Proceed to step 8 Measure the voltage from pin 8 to 9 of Measured voltage is positive a U7 defective U7 b Measured voltage is negative b U5 defective A 10 ADJUSTMENT AND CALIBRATION Current Limit Adjustment To adjust the current limit circuit in the V1 or V2 supply pro ceed as follows a Turnthe current limit adjustment pot R63 for V1 supply or R34 for V2 supply to fully counter clockwise b Connect the test setup shown in Figure A 6 to the output of the supply to be adjusted Substitute a short for R and leave load circuit switch open Turn supply and set the VOLTAGE control for max imum output fully clockwise d Close load switch and adjust the current limit pot R63 or R34 until the DVM indicates a voltage drop across the shunt of 0 1 V 5 0
12. 1 Class B CISPR 11 1990 Limits and Methods of Radio Interference Characteristics of Industrial Scientific and Medical ISM Radio Frequency Equipment m EN 50082 1 1992 IEC 801 2 1991 Electrostatic Discharge Requirements IEC 801 3 1984 Radiated Electromagnetic Field Requirements 1 4 IEC 801 4 1988 Electrical Fast Transient Burst Requirements m ICES NMB 001 This ISM device complies with Canadian ICES 001 Cet appareil ISM est conforme la norme NMB 001 du Canada INSTRUMENT AND MANUAL IDENTIFICATION A serial number identifies your power supply The serial num ber encodes the country of manufacture the week of the lat est significant design change and a unique sequential number The letter KR designates Korea as the country of manufacture the first one digit indicates the year 4 1994 5 1995 and so forth and the second two digits indicate the week The remaining digits of the serial number are a unique five digit number assigned sequentially If a yellow Change Sheet is supplied with this manual its pur pose is to explain any differences between your instrument and the instrument described in this manual The Change Sheet may also contain information for correcting errors in the manual OPTIONS Options 0E3 and 0E9 determine which line voltage is selected at the factory The standard unit is configured for 115 Vac 10 47 63 Hz input Option No Description OEM 115 Vac 10 47 63 Hz Inp
13. 5133 0 1252 4159 80 1 13 0360 2359 13 TERMINAL TEST POINT 230IN ABOVE 28480 ET 1 Su WEE NC eR oe Cuu d SW POWER pF c42 1u Als pF F1 SES L 1 42 PLUG AC FEMALE Po ECTOR SW
14. 620A front panel controls illustrated in Figure 2 and serve as a brief check that the supply is operational Follow this checkout pro cedure or the more detailed performance test of service infor mation section when the instrument is received and before it is connected to any load equipment Proceed to the more detailed performance test beginning in service information section if any difficulties are encountered a Connect line cord to power source and push LINE switch C in b Push the V1 meter select pushbutton switch to in position to monitor supply s V1 output voltage With no load connected vary the V1 voltage control over its range and check that the voltmeter responds to the con trol setting and the ammeter indicates zero Turn the V1 voltage control fully clockwise and short the V1 output terminal to V1 terminal with an insulated test lead The ammeter should indi cate a short circuit output current of minimum 1 0 A 5 at 25 C Remove the short from the output termi nals d Push the V2 meter select pushbutton switch to in position and repeat steps b and c for V2 output If this brief checkout procedure or later use of the supply reveals a possible malfunction see the service information section for detailed test troubleshooting and adjustment pro cedures OPERATION The dual outputs of the E3620A can be used individually in series or in parallel Each output can be flo
15. 97 Bourns Inc Riverside CA REFERENCE DESIGNATE Table A 11 Replaceable Parts List Agilent PART Q TY NUMBER 8120 8767 8120 8768 E3620 60 E3620 60005 5041 8622 0371 3806 E3630 40007 DESCRIPTION 3 E3631 20 E3631 20012 E3631 20013 C17 18 27 28 40 41 80 CE C7 8 11 12 15 16 34 36 39 60 255726 0180 3657 C9 37 13 14 35 38 R13 14 15 16 17 27 36 37 6110757 044 2 3620 60004 1 Ea HE ET Be En cael 3020 6000 fr 2 5 C10 21 29 30 0180 4355 4 CA C42 A RES VAR 10K 5 10 TURN WW UF 20 25V AL ELEC 20 50V AL E CAP FXD 0 1UF 20 250V PPR MET F 20 35V AL ELECTLT F 10 50V POLYP MET FXD 470UF 50V 20 AL ELECTLT BINDING POST RED BINDING POST BLACK BINDING POST GREEN TLT UF 10 100V CER CAP FXD 0 01 4 CAP FXD 1000UF 20 63V AL ELECT CAP FX F 10 35V TA AP 00 AP FXD 4700 20 250V CER X5V RESISTOR 100 1 0 125W TF TC 0 RESISTOR 3 4 CAP FXD 0 33UF 10 250V POLYP MET AP F 8U FXD F 5 1001 CER RESISTOR FUSE 10HM 5 0 5W 70 100 1 0 125W TF TC 0 100 i MFR P N 2N6056 REFERENCE DESIGNATE R41 49 70 77 79 R29 58 69 R28 30 56 64 R44 46 R35 55 9 10 11 12 U1 2 3 U6 7 CR15 5 6 74 135 17 185 19 Q3 4 5
16. A LF442 a A AVS SCB nee 7 ELS Fl RE 12 Vat R6 T 1 uT 100005 ox R58 RS6 p SH oh 287 O 5W 5k 1 2K NE Vai L2 R69 12V1 3 R amp SR uia Ve V 17 8k 010 8 1 CR22 R71 CR6 CRS 1 102k _ Op UF 4 4 UF 4H 4 4 LF442 j Fe 2N4036 4 4 CR27 V BRER AC 1 DREG R75 CR4 CR23 ae I 2KBP 2M 12V1 59 RU VA1 R77 P L K 1K 13637 T 6 8u 2 12V1 2 LABEL 0 OUTPUT 1 00 NN AA
17. Connect each load to the power supply output terminals using separate pairs of connecting wires This will minimize mutual coupling effects between loads and takes full advantage of the low output impedance of the supply Load wires must be of adequately heavy gauge to maintain satisfactory regulation at the load Make each pair of connecting wires as short as possible and twist or shield them to reduce noise pick up If a shield is used connect one end of the shield to the power supply ground terminal and leave the other end unconnected If load considerations require locating output power distribution terminals at a distance from the power supply then the power supply output terminals should be connected to the remote dis tribution terminals by a pair of twisted or shielded wires and each load should be connected to the remote distribution terminals separately Series Operation The two outputs V1 and V2 can be connected in series to obtain a voltage up to 50 V higher than that available from a single output Each output control V1 and V2 must be adjusted in order to obtain the total output voltage Diodes connected internally across each output protect the supply s output filter capacitors against reverse voltages This could occur if the sup plies are connected in series and the output is shorted Parallel Operation The V1 and V2 supplies can be connected in parallel to obtain a total output current greater than that available
18. DDITIONAL MANUALS 1 4 SPECIFICATIONS ay ese ote ar ale alge aar al Gade 1 4 LINE FUSE 44507 omegnen Gerda Fr SA Sa ee eee ESN 1 5 INSTALLATION ans ee ee 1 5 INITIAL INSPECTION 2 aa skjele ka Le elfa od a ele Mlt 1 5 Mechanical Check vatn une ke bee 1 5 EledtriealGheckuuys Gunnar see a NTT AGA IO de 1 5 INSTALLATION DATA oase date ays erre ge be PG 1 5 Location and COOLING u Skuta usett ere Pod hd sk ee 1 5 Outline Diagram Ate oe a CE PR as det a Ga 1 6 Rack Mountngn au ek Hakk EL ALEN 1 6 INPUT POWER REQUIREMENTS 1 6 ss stanses fecal este helge pene r adm brei ed 1 6 OPERATING amp eee eee eee 1 6 INTRODUCTION Su qual y S ae di uten leat al ee a ace ahr cats tat i 1 6 CONTROLS teh ua at 22 3 See see 1 6 Line Scene ced ce Ee 1 6 Voltage and Current Metering 1 6 Voltage Control SAs vera Ph atte ae te eta 1 6 TURN ON CHECKOUT PROCEDURE arva rar rar rer nr eee ee eee 1 7 OPERATION o aA eg ei Belge pt ep EA ae 1 7 Overload Protection Circuits 0 00000 rare 1 7 Operation Beyond Rated Output 1 7 Connecting Eoad out a s e
19. PUT DRIFT Less than 0 1 plus 5 mV dc to 20 Hz during 8 hours at constant line load and ambient after an initial warm up time of 30 minutes LOAD TRANSIENT RESPONSE TIME Less than 50 usec for output recovery to within 15 mV of nominal output voltage following a load change from full load to half load or vice versa OUTPUT VOLTAGE OVERSHOOT During turn on or turn off of ac power output plus overshoot will not exceed 1 V if the output control is set for less than 1 V If the control is set for 1 V or higher there is no overshoot METER ACCURACY 0 5 of output 2 counts at 25 C 5 C METER RESOLUTION Voltage 10 mV 0 to 20 V 100 mV above 20 V Current 1 mA DIMENSIONS 212 3 mmW x 88 1 mmH x 345 4 mmD 8 4 inW x 3 5 inH x 13 6 inD WEIGHT 5 0 kg 11 0 Ibs net 6 25 kg 13 8 Ibs shipping Electrical Check This instrument should be checked against electrical specifi cations Perform the TURN ON CHECKOUT PROCEDURE in the following paragraph to confirm that the supply is operational Alternately check the supply more fully using the PERFORMANCE TEST in the service information section INSTALLATION DATA The instrument is shipped ready for bench operation Before applying power to the supply please read the INPUT POWER REQUIREMENTS paragraph Location and Cooling This instrument is air cooled Sufficient space should be allowed so that a free flow of cooling air can reach the sides and rear of the instrumen
20. acitor of the supply To avoid these effects it is necessary to preload the supply with dummy load resistor so that the supply delivers current through the entire operating cycle of the load devices ACTIVE LOAD DEVICE CURRENT FLOW DURING tN CURRENT FLOW DURING tA Figure 3 Reverse Current Loading Solution 1 8 OUTPUT CAPACITANCE An internal capacitor across the output terminals of the supply helps to supply high current pulses of short duration during constant voltage operation Any capacitance added exter nally will improve the pulse current capability but will decrease the load protection provided by the current limiting circuit high current pulse may damage load components before the average output current is large enough to cause the current limiting circuit to operate REVERSE VOLTAGE PROTECTION diode is connected across the output terminals with reverse polarity This diode protects the output electrolytic capacitors and the series regulator transistors from the effects of reverse voltage applied across the output terminals Since series regulator transistors can not withstand reverse voltage either diodes are also connected across them When operat ing supplies in parallel these diodes protect an unenergized supply that is in parallel with an energized supply SERVICE INFORMATION RECTIFIER FILTER AND PREREGULATOR
21. age across Rs and convert it to current by dividing this voltage by Rs f Check that the current is less than 1 pA g Repeat steps a through f for the V2 supply Load Transient Response Time Definition This is the time for the output voltage to return to within a specified band around its voltage following a change from full load to half load or half load to full load To measure the load transient response time a Connect the test equipment across the output of the V1 supply as shown in Figure A 7 but replace the DVM with the oscilloscope Operate the electronic load in constant current mode b Turn the supply and push the V1 METER switch in Turn up V1 output voltage to 25 0 volts Set the electronic load to transient operation mode between one half of supply s full rated value and supply s full rated value at 1 kHz rate with 50 duty cycle e Set the oscilloscope for ac coupling internal sync and lock on either the positive or negative load transient f Adjust the oscilloscope to display transients as shown Figure A 9 g Check that the pulse width t2 t1 of the transients at 15 mV from the base line is no more than 50 usec as shown h Repeat steps a through g for the V2 supply Stability Drift Definition The change in output voltage dc to 20 Hz for the first 8 hours following a 30 minute warm up period with con stant input line voltage constant load resistance and constant am
22. age increases Remove short and proceed to step to 12 V 3 Eliminate current limit a Output voltage increases Check for U10A defective circuit as a source of b Output voltage remains low Reconnect lead and proceed to trouble by disconnecting step 4 anode of CR9 Measure voltage at pin a Measured voltage is near Check for defective U10B 3 of U10 0 7V b Measured voltage is zero volt Check for shorted CR14 and CR15 c Measured voltage is near Check for shorted R48 or leaky or 0 7V shorted C9 A 8 Table 6 V2 Supply Troubleshooting SYMPTOM STEP ACTION RESPONSE PROBABLE CAUSE High output voltage Attempt to turn off Q1 by a Output voltage remains high Q1 shorted higher than rating shorting emitter to col b Output voltage decreases Remove short and proceed to step lector of Q6 2 Measure voltage at base of Q6 a Measured voltage is more than 0 Check for open CR8 or R48 and volt check for defective U10B b Measured voltage is less than 0 Check for defective Q6 volt Low output voltage Attempt to turn on Q1 by a Output voltage remains low Q1 open lower than rating disconnecting emitter of b Output voltage increases Re connect the emitter lead and Q6 proceed to step 2 Attempt to turn off of Q6 Output voltage remains low Q6 shorted by shorting point b Output voltage increases Remove short and proceed to step to 12 V 3 Eliminate current limi
23. ated up to 240 volts off ground or the or terminal of either output can be grounded to the chassis ground terminal which is located on the supply s front panel Overload Protection Circuits The outputs are individually protected against overload or short circuit damage by separate current limiting circuits The circuits are factory adjusted to limit the output current to mini mum 1 5 The current limits are set by adjusting R63 in the V1 supply and R34 in the V2 supply see the schematic diagram No deterioration of supply performance occurs if the output current remains below the current limit setting NOTE During the actual operation of the V1 and V2 outputs if a load change causes the current limit to be exceeded the OVER LOAD LED is lighted If overload conditions occur the V1 and V2 supplies will protect the load by limiting the current to min imum 1 A 5 The V1 and V2 supplies are self restoring that is when the overload is removed or corrected the output voltage is automatically restored to the previously set value 1 7 Operation Beyond Rated Output The supply may be able to provide voltages and currents greater than its rated maximum outputs if the line voltage is at or above its nominal value Operation can be extended up to 5 over the rated output without damage to the supply but performance can not be guaranteed to meet specifications above the rated output of 0 to 25 V at 1 A Connecting Load
24. bient temperature To measure the stability a Connect the test equipment across the output of the V1 supply as shown in Figure A 7 b Operate the electronic load in constant current mode and set its current to 1 000 A c Turn on the supply and push the V1 METER switch in d Turn up V1 output voltage to 25 0 volts as read on the digital voltmeter e After a 30 minute warm up note the voltage on DVM f The output voltage reading should deviate less than 0 1 plus 5 mV from the reading obtained in step over a period of 8 hours g Repeat steps a through f for the V2 supply 570 005 25 60us 1 At 39 06KH2 Figure A 9 Load Transient Response Time Waveform TROUBLESHOOTING Before attempting to troubleshoot the power supply ensure that the fault is with the supply and not with an associated piece of equipment You can determine this without removing the covers from the power supply by using the appropriate portions of the Performance Tests paragraph CAUTION Before applying power to the supply make certain that its line voltage selector switch S1 is set for the line voltage to be used Initial Troubleshooting Procedure If malfunction is found follow the steps below a Disconnect input power from the supply and remove all loads from the output b Table A 2 lists the symptoms and probable causes of several possible troubles If the symptoms is one of those listed make the recommended che
25. bleshooting infor mation and adjustment and calibration procedures The fol lowing operation verification tests comprise a short procedure to verify that the power supply is performing properly without testing all specified parameters If a fault is detected in the power supply while making the performance check or during normal operation proceed to the troubleshooting procedures After troubleshooting per form any necessary adjustments and calibrations Before returning the power supply to normal operation repeat the performance check to ensure that the fault has been properly corrected and that no other faults exist Test Equipment Required Table A 1 lists the equipment required to perform the various procedures described in this section Operation Verification Tests The following tests assure that the power supply is per forming properly They do not however check all the speci fied parameters tested in the complete performance test described below Proceed as follows a Perform turn on checkout procedure given in page 1 7 b Perform the load regulation performance tests given in the following paragraphs Table 1 Test Equipment Required Current Range 10 Adc Open and short switches Transient on off TYPE REQUIRED CHARACTERISTICS RECOMMENDED USE MODEL Oscilloscope Sensitivity 100 uV Display transient response and ripple Agilent 54503A Bandwidth 20 MHz 100 MHz and noise waveforms RMS Voltm
26. by Agilent for use with a hardware product and when properly installed on that hardware product are warranted not to fail to execute their programming instruc tions due to defects in material and workmanship for a period of 90 days from date of delivery During the warranty period either Agilent or Agilent Technologies will at its option either repair or replace products which prove to be defective Agilent does not warrant that operation 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 Return to Englewood Colorado Service Center for repair in United States 1 800 258 5165 Customer shall prepay shipping charges by and shall pay all duty and taxes for products returned to Agilent for warranty service Except for the products returned to Customer from another country Agilent shall pay for return of products to Customer Warranty services outside the country of initial purchase are included in Agilent s product price only if Customer pays Agilent international prices defined as destination local currency price or U S or Geneva Export price If Agilent 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 The warranty period begins on the dat
27. cks If none of the symptoms of Table 2 apply proceed to Table A 3 This table provides an initial troubleshooting procedure that also directs you to the more detailed pro cedures which follow it The numbered test points referred to in the troubleshooting procedures are identified on the circuit schematic at the rear of the manual Open Fuse Troubleshooting Although transients or fatigue can cause a fuse to blow it is a good idea to inspect the unit for obvious shorts such as dam aged wiring charred components or extraneous metal parts or wire clippings in contact with circuit board conductors before replacing the fuse The rating of the correct replace ment fuse depends on the line voltage option of the instru ment for Option OE3 use a slow blow 1 amp fuse and standard and Option OE9 use a slow blow 2 amp fuse Table A 2 Miscellaneous Troubles SYMPTOM CHECK PROBABLE CAUSE High ripple a 4 Check operating setup for ground loops Check main rectifiers CR2 for open c Supply may be operating in current limit mode Check current limit adjustment steps 1 thru n Will not current limit Check for open OR gate diodes CR9 CR21 or defective current limit amplifiers U10 U19 Poor load and line regulation a Check bias and reference voltages Table A 4 b Check main rectifiers and filters for opens Oscillation or poor transient a respons
28. drop with the DVM The current should be mini mum 1 5 o Open the load switch and repeat steps k through n for the V2 supply Load Regulation Load Effect Definition The change AE u in the static value of dc out put voltage resulting from change in load resistance from open circuit to the value that yields maximum rated output current or vice versa To check the load regulation a Connect the test equipment across the output of the V1 sup ply as shown in Figure A 7 Operate the electronic load in constant current mode and set its current to 1 000 A b Turn on the supply Push the 1 METER switch in and adjust its voltage to 25 0 volts c Record the voltage indicated on the DVM d Operate the electronic load in open input off mode and recheck the DVM indication after reading settles It should be within 0 01 plus 2 mV of the reading in step c e Repeat steps a through d for the V2 supply ELECTRONIC LOAD REGULATED SOURCE E A regulated AC source is used in this load effect testing configuration to maintain the AC input at a predetermined value This will ensure that the test results reflect changes in only with respect to load current changes Figure A 7 Basic Test Setup Line Regulation Source Effect Definition The change AE u in the static value of dc out put voltage resulting from a change in ac input voltage from a minimum to a maximum value 10 o
29. e Geum Selah Sot ete kaq 1 7 Series Operations id ge ek ie a ee METT 1 7 Parallel Operation ul u a e eee eee eee O 1 7 LOAD CONSIDERATIONS u u ca ee a Dee Oe 1 7 PULSE EOADING eger Ekte be ee eg BET Eie Ge 1 7 REVERSE CURRENT LOADING 1 8 um u u S SS ed Arn Ger serer 1 8 REVERSE VOLTAGE PROTECTION 1 8 1 3 GENERAL INFORMATION DESCRIPTION The Model E3620A Dual Output Power Supply is compact constant voltage current limiting supply that delivers two iso lated 0 to 25 V outputs rated at 1 A It is an ideal power supply for design and breadboard work where single or dual voltages are required Each output voltage is continuously variable throughout its range and separate current limit circuits protect each output against overload or short circuit damage Connections to the outputs are made to binding post type ter minals on the front panel The outputs can be used individu ally or in combination to satisfy any number of output demands The positive or negative terminal of each output can be grounded or each output can be left floating A chassis ground terminal is located on the front panel of the supply The front panel also contains a line switch output voltage controls an autoranging digital voltmeter and a si
30. e of delivery or on the date of installation if installed by Agilent LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer Cus tomer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifica tions for the product or improper site preparation and maintenance TO THE EXTENT ALLOWED BY LOCAL LAW NO OTHER WARRANTY IS EXPRESSED OR IMPLIED AND AGILENT SPECIFICALLY DISCLAIMS THE IMPLIED WARRAN TIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE For consumer transactions in Australia and New Zealand The warranty terms contained in this statement except to the extent lawfully permitted do not exclude restrict or modify and are in addition to the mandatory rights applicable to the sale of this product to you EXCLUSIVE REMEDIES TO THE EXTENT ALLOWED BY LOCAL LAW THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER S SOLE AND EXCLUSIVE REMEDIES AGILENT 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 contacts product maintenance agreements and customer assistance agreements are also available Contact your nearest Agilent Technolo gies Sales and Service office for further information o
31. e time b ranges High frequency oscillations above 50 kHz can be caused by an open C13 or C35 A defective output capacitor C10 or C29 can cause oscillations in one of many frequency c Oscillation only in the current limiting mode can be caused by an open C34 or C12 Excessive heat a Check preregulator control circuit Refer to Table A 7 and Table A 8 b Check Q4 and Q5 for short Output Voltage clamped for each output Check preregulator control circuit Refer to Table A 7 and Table A 8 Table A 3 Initial Troubleshooting Procedure STEP ACTION RESPONSE NEXT ACTION 1 Check output voltage of V1 and V2 supplies a Zero volts higher than rating b Output voltage lower or a Check ac line fuse F1 If blown proceed to Open Fuse Troubleshooting paragraph If not blown check bias and reference voltages Table A 4 b Check bias and reference voltages Table 4 A 7 Table 4 Output Voltage Bias and Reference Voltage Check STEP ACTION RESPONSE NEXT ACTION Check 12V bias Normal 12V 5 Voltage high Output voltage lower or higher than rating Proceed to step 3 Check U13 for V2 output or U23 for V1 output for short Check U13 for V2 output or U23 for V1 output for open Note A short within U4 U5 U6 U7 U9 U10 U18 or U19 can cause low 12V or 12V bias voltages 2 Check 12V bias Normal 12V
32. ed by dividing the voltage across the sam pling resistor by its ohmic value The total resistance of the series combination should be equal to the full load resistance as determined in the preceding paragraphs Of course if the value of the sampling resistor is very low when compared to the full load resistance the value of the sampling resistor may be ignored The meter shunt recommended in Table A 1 for example has a resistance of only 100 mQ and can be neglected when calculating the load resistance of the supply Figure A 5 shows a four terminal meter shunt The load cur rent through a shunt must be fed from the extremes of the wire leading to the resistor while the sampling connections are made as close as possible to the resistance portion itself CURRENT SAMPLING EXTERNAL TERMINALS LOAD TO UNGROUNDED TERMINAL OF POWER SUPPLY TO GROUNDED TERMINAL OF POWER SUPPLY SAMPLING RESISTOR LOAD TERMINALS Figure A 5 Current Sampling Resistor Connections Rated Output Meter Accuracy and Current Limit To check that all supplies will furnish their maximum rated output voltage and current that the front panel meters are accurate A 4 and that the current limit circuits function proceed as follows Rated Output Voltage and Voltmeter Accuracy a With no loads connected turn on the supply and push the V1 METER switch in Connect a DVM between the V1 and terminals and set V1 VOLTAGE control until front panel voltmet
33. er indicates 17 00 volts b Check the DVM indication It should be within 0 5 2 counts of the front panel voltmeter indication 16 90 to 17 10 V Set V1 VOLTAGE control clockwise until front panel volt meter indicates 25 0 volts d DVMshould indicate 25 volts 0 5 2 counts 24 675 V to 25 325 V e Repeat steps a through d for the V2 supply Rated Output Current and Ammeter Accuracy f Connect the test setup shown Figure A 6 to the V1 sup ply s and output terminals g Push the V1 METER switch in to monitor the V1 supply s output current h Close the load switch and adjust V1 VOLTAGE control until front panel ammeter indicates 1 000 A i Check that DVM indicates a voltage drop across the cur rent sampling resistor that corresponds to a current of 1 amp 0 5 2 counts 0 993 A to 1 007 A j Open the load switch and repeat steps f through i for the V2 supply POWER SUPPLY UNDER TEST RL 250 100W 5 DIGITAL VOLTMETER Figure A 6 Output Current Test Set Up Current Limit k Disconnect all loads from the supply I Connect the test setup shown in Figure 6 to the V1 supply s and output terminals Substitute a short for Ry and leave the load switch open m Push the V1 METER switch in and adjust the V1 VOLT AGE control fully clockwise n Close the load switch and determine the current flow through the current sampling resistor Rg by measuring its voltage
34. ese values against a set of three internally derived reference lev els These three reference levels are translated into boundary lines to allow the output characteristic to be mapped into four operating regions Figure A 2 The boundary lines which are invisible to the user are divided into four operating regions V1 V2 V3 and V4 to minimize the power dissipation in the series pass transistors Whenever the output voltage is below the sloping V1 line the control circuit inhibits two TRIACs and the input capacitors charge to a voltage determined by N1 Figure A 2 indicates the windings that are connected as a result of the other voltage decisions The reference and bias supplies of each supply power the operational amplifiers and provide reference and bias volt ages for the output regulators The display power circuit pro vides voltage which is used by the A D converter and display A 2 N2 CR2 and CR3 ON Ni N2 CR2 ON N1 CR2 and CR3 ON Figure A 2 Output Power Plot Diode CR13 and CR19 are connected across the output terminals in reverse polarity They protect the output electrolytic capacitor and the series regulator transistors from a reverse voltage applied across the output terminals Two meter pushbutton switches select which supply V1 or V2 has its output voltage and current indicated on the front panel meters MAINTENANCE INTRODUCTION This section provides performance test trou
35. eter True rms 20 MHz bandwidth Measure rms ripple and noise Sensitivity 1 mV voltage Accuracy 5 Multimeter Resolution 100 nV Measure voltages Agilent 34401A Accuracy 0 0035 Electronic Load Voltage Range 240 Measure load and line regulation Agilent 6063A Resistive Loads 25 Q 5 100 W Measure ripple and noise Current Sampling 0 1 Q 0 1 3 W Resistor Shunt Measure output current Variable Voltage Range 85 130 and 200 260 Volts Auto Transformer Vary ac input Line Voltage Option Conversion To convert the supply from one line voltage option to another the following three steps are necessary a After making certain that the line cord is disconnected from a source of power remove the top cover from the supply and set the two sections of the line voltage selec tor switch for the desired line voltage see Figure A 3 b Check the rating of the installed fuse and replace it with the correct value if necessary For Option OE3 use a slow blow 1 amp fuse For standard and Option OE9 use a slow blow 2 amp fuse Mark the instrument clearly with a tag or label indicating the correct line voltage to be used lt q FRONT OF SUPPLY Figure A 3 Line Voltage Selector set for 115 Vac PERFORMANCE TESTS The following paragraphs provide test procedures for verify ing the power supply s compliance with the specifications of Table 1 Proceed to the tro
36. f nominal voltage To check the line regulation a Connect a variable autotransformer between the input power source and the power supply line plug b Connect the test equipment across the output of the V1 sup ply as shown in Figure A 7 Operate the electronic load in constant current mode and set its current to 1 000 A c Adjust the autotransformer for a low line input 10 of nominal voltage d Turn on the power Push the V1 METER switch in and adjust the output of the supply to 25 0 volts and record the DVM indication e Adjust the autotransformer for high line voltage input 10 of nominal voltage and recheck the DVM indication It should be within 0 01 plus 2 mV of the reading in step d f Repeat steps b through e for the V2 supply Ripple and Noise Normal Mode Voltage Definition Ripple and noise are measured in the rms or peak to peak value over a 20 Hz to 20 MHz bandwidth Fluctuations below the lower frequency limit are treated as drift A 5 RMS Measurement The rms measurement is not an ideal representation of the noise since fairly high output noise spikes of short duration could be present in the ripple and not appreciably increase the rms value To measure the ripple and noise of the rms value on each output supply output a Connect the test equipment across the output of the V1 supply as shown in Figure A 8 b Turn on the supply and push the V1 METER switch in c Adjust the output of
37. from one supply The total output current is the sum of the output currents of the individual supplies The output voltage controls of one power supply should be set to the desired output voltage and the other supply set for a slightly larger output voltage The supply set to the lower output voltage will act as a constant voltage source while the supply set to the higher output will act as a current lim ited source dropping its output voltage until it equals that of the other supply The constant voltage source will deliver only that fraction of its rated output current necessary to fulfill the total cur rent demand LOAD CONSIDERATIONS This section provides information on operating your supply with various types of loads connected to its output PULSE LOADING The power supply will automatically cross over from constant voltage to current limit operation in response to an increase in the output current over the preset limit Although the preset limit may be set higher than the average output current high peak currents as occur in pulse loading may exceed the preset current limit and cause crossover to occur and degrade performance REVERSE CURRENT LOADING An active load connected to the supply may actually deliver reverse current to the supply during portion of its operating cycle An external source can not be allowed to pump current into the supply without risking loss of regulation and possible damage to the output cap
38. ich output may be varied using front panel controls Output Vi 25 Vat 1 A Output V2 0 25 Vat 1 A LOAD REGULATION Less than 0 01 plus 2 mV for a full load to no load change in output current LINE REGULATION Less than 0 01 plus 2 mV for any line voltage change within rating RIPPLE AND NOISE Normal Mode Voltage Less than 0 35 mV rms 1 5 mV p p 20 Hz 20 MHz Common Mode Current CMI Less than 1 uA rms for all outputs 20 Hz 20 kHz OPERATING TEMPERATURE RANGE 0 to 40 C for full rated output At higher temperatures output current is derated linearly to 50 at 55 C maximum temperature TEMPERATURE COEFFICIENT Less than 0 02 plus 1 mV voltage change per C over the operating range from 0 to 40 C after 30 minutes warm up INSTALLATION INITIAL INSPECTION Before shipment this instrument was inspected and found to be free of mechanical and electrical defects As soon as the instrument is unpacked inspect for any damage that may have occurred in transit Save all packing materials until the inspection is completed If damage is found a claim should be filed with the carrier The Agilent Technologies Sales and Service office should be notified as soon as possible Mechanical Check This check should confirm that there are no broken knobs or connectors that the cabinet and panel surfaces are free of dents and scratches and that the meter is not scratched or cracked 1 5 STABILITY OUT
39. n Agilent s full line of Support Programs DECLARATION CONFORMITY According to ISO IEC Guide 22 and CEN CENELEC EN 45014 Manufacturer s Name and Addresss Responsible Party Alternate Manufacturing Site Agilent Technologies Inc Agilent Technologies Malaysia Sdn Bhd 550 Clark Drive Suite 101 Malaysia Manufacturing Budd Lake New Jersey 07828 Bayan Lepas Free Industrial Zone PH III USA 11900 Penang Malaysia Declares under sole responsibility that the product as originally delivered Product Name a Single Output dc Power Supply dual range b Single Output dc Power Supply single range c Single Output System Power Supply d Multiple Output dc Power Supply e Multiple Output System dc Power Supply Model Number a E3610A E3611A E3612A b E3614A E3615A E3616A E3617A c E3632A d E3620A E3630A e E3631A Product Options This declaration covers all options of the above product s Complies with the essential 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 ISM Group Class A Emissions As detailed in Electromagnetic Compatibility EMC Certificate of Conformance Number CC TCF 00 102 based on Technical Construction File TCF ANJ12 dated Dec 20 2000 Assessed by Celestica Ltd Appointed Competent Body Westfields House West Avenue Kidsgrove Stoke on Trent Straffordshire ST7 1TL United Ki
40. ngdom Safety Information and Conforms to the following safety standards 61010 1 2001 EN 61010 1 2001 CSA 22 2 No 1010 1 1992 This DoC applies to above listed products placed on the EU market after January 1 2004 Date Bill Darcy Regulations Manager For further information please contact your local Agilent Technologies sales office agent or distributor or Agilent Technologies Deutschland GmbH Herrenberger Stra Be 130 D71034 B blingen Germany Revision B 00 00 Issue Date Created on 11 24 2003 3 10 Document No KIO 10 32 11 24doc doc PM
41. ngle range digital ammeter and two meter select pushbutton switches The meter pushbuttons select both voltage and current monitoring for the output V1 and V2 The supply is furnished with a detachable 3 wire grounding type line cord The ac line fuse is an extractor type fuseholder on the rear heat sink SAFETY CONSIDERATIONS This product is a Safety Class instrument which means that it is provided with a protective earth ground terminal This ter minal must be connected to an ac source that has a 3 wire ground receptacle Review the instrument rear panel and this manual for safety markings and instructions before operating the instrument Refer to the Safety Summary page at the beginning of this manual for a summary of general safety information Specific safety information is located at the appropriate places in this manual SAFETY AND EMC REQUIREMENTS This power supply is designed to comply with the following safety and EMC Electromagnetic Compatibility requirements IEC 1010 1 1990 EN 61010 1993 Safety Require ments for Electrical Equipment for Measurement Control and Laboratory Use gm CSA 22 2 No 231 Safety Requirements for Electrical and Electronic Measuring and Test Equipment UL 1244 Electrical and Electronic Measuring and Testing Equipment m EMC Directive 89 336 EEC Council Directive entitled Approximation of the Laws of the Member States relating to Electromagnetic Compatibility EN 55011 1991 Group
42. nnected to the neutral earthed pole of the ac power lines supply mains 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 compo nents with power cable connected Under certain conditions dangerous voltages may exist even with the power cable removed To avoid injuries always disconnect power dis charge circuits and remove external voltage sources before touching components DO NOT SERVICE OR ADJUST ALONE Do not attempt internal service or adjustment unless another person capable of rendering first aid and resuscitation is present SAFETY SYMBOLS Instruction manual symbol the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual Indicate earth ground terminal WARNING The WARNING sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly per formed or adhered to could result inper sonal injury Do not proceed beyond WARNING sign until the indicated con ditions are fully understood and met The CAUTION sign denotes a hazard It calls attention to an operating procedure or the like which if not correctly per formed or adhered
43. ordering replacement parts Table A 11 lists parts by reference designators and pro vides the following information Reference designators Refer to Table A 9 Agilent Technologies Part Number Total quantity used in that assembly Description Manufacturer s supply code number Refer to Table A 10 for manufacturer s name and address Manufacturer s part number or type 02000 Fal Mechanical and miscellaneous parts are not identified by ref erence designator ORDERING INFORMATION To order a replacement part address order or inquiry to your local Agilent Technologies sales office see lists at rear of this manual for addresses Specify the following information for each part Model complete serial number of the power sup ply Agilent Technologies part number circuit reference des ignator and description Table A 9 Reference Designators Assembly Capacitor Diode Signaling Device light Fuse Pulse Generator Jack Inductor Transistor Resistor Switch Transformer Test Point Zener Diode Integrated Circuit Wire AOTCOTNDIOO YS 440 scsq Table A 10 Code List of Manufacturers CODE MANUFACTURER ADDRESS 01295 Texas Instruments Inc Semicon Comp Div Dallas TX 14936 General Instruments Corp Semicon Prod Hicksville N Y 27014 National Semiconductor Corporation Santa Clara CA 28480 Agilent Technologies Palo Alto CA 04713 Motorola Semiconductor Products Phoenix AZ 329
44. rs turn on checkout procedures and other operating consider ations for the Model E3620A Dual Output Power Supply 1 6 CAUTION Before applying power to the supply check the label on the heat sink to make certain that the supply s line voltage option agrees with the line voltage to be used If the option does not correspond to your line voltage refer to paragraph LINE VOLTAGE OPTION CONVERSION in the service section before applying power i 3620 ovon Agilent Sa om Kom eureLy Notre Aunt 4888 1686 E Figure 2 Front Panel Controls and Indicators CONTROLS Line Switch The LINE pushbutton switch G Figure 2 is pushed in to turn the supply ON and released out position to turn the supply OFF Voltage and Current Metering Two meter select pushbutton switches 2 and permit the output voltage and current of either output V1 or V2 to be monitored on the VOLTS AMPS meter The V1 and V2 output select pushbuttons connect the desired output to the meter ing circuit when the applicable button is pushed in NOTE Be careful that both METER pushbuttons are not released out position or pushed in simultaneously Voltage Controls The V1 and V2 voltage controls 2 and s set the voltage level of the corresponding output The voltage controls are 10 turn potentiometers TURN ON CHECKOUT PROCEDURE The following steps describe the use of the Model E3
45. t a Output voltage increases Check for U10A defective circuit as a source of b Output voltage remains low Reconnect lead and proceed to trouble by disconnecting step 4 anode of CR9 Measure voltage at pin a Measured voltage is near Check for defective U10B 3 of U10 0 7V b Measured voltage is zero volt Check for shorted CR14 and CR15 c Measured voltage is near Check for shorted R48 or leaky or 0 7V shorted C9 Table A 7 V1 Preregulator Control Circuit Troubleshooting STEP ACTION RESPONSE PROBABLE CAUSE Set output voltage at 16V 1 Measure the voltage for pin 7 of U18 a Measured voltage is 12V a Proceed to step 2 b Measured voltage is near b Check for defective U18B 11 3V 2 Measure the voltage for pin 1 of U3 a Measured voltage is near 1V a Check for defective U3 or Q5 b Measured voltage is near OV b Check for open Q9 or R6 Table A 8 V2 Preregulator Control Circuit Troubleshooting STEP ACTION RESPONSE PROBABLE CAUSE Set output voltage to 10V 1V 1 Measure the voltage for pin 1 of U4 a High voltage 0 7 V a U1 or Q3 defective b Low voltage 0 V b Proceed to step 2 2 Measure the voltage for pin 1 of U6 a Low voltage 12 V a U4 defective b High voltage 12 V b Proceed to step 3 3 Measure the voltage for pin 1 of U7 a High voltage 12 V a U6 defective b Low voltage 12 V b Proceed to step 4 4 Measure the
46. t when it is in operation It should be used in an area where the ambient temperature does not exceed 40 C Outline Diagram Figure 1 illustrates the outline shape and dimensions of the supply Rack Mounting This supply may be rack mounted in standard 19 inch rack panel either by itself or alongside similar unit Please see the ACCESSORY page 1 4 for available rack mounting accessory The rack mounting kit includes complete installa tion instructions INPUT POWER REQUIREMENTS Depending on the line voltage option ordered the supply is ready to be operated from one of the power sources listed in Table 1 label on the rear heat sink shows the nominal input voltage set for the supply at the factory Power Cable To protect operating personnel the supply should be grounded This supply is equipped with three conductor power cable The third conductor is the ground conductor and when the cable is plugged into an appropriate receptacle the supply is grounded The power supply is equipped at the fac tory with power cord plug appropriate for the user s location Notify the nearest Agilent Sales and Service Office if the appropriate power cord is not included with the supply 345 4 mm 88 1 mm 13 598 in 3 469 in 3924 mm 15 449 in Figure 1 Outline Diagram OPERATING INSTRUCTIONS INTRODUCTION This section describes the operating controls and indicato
47. th a full load resistance connected across the sup ply output The resistance and wattage of the load resis tor therefore must permit operation of the supply at its rated output voltage and current For example a supply rated at 25 OUTPUT N B LOAD LEAD MONITOR HERE Figure A 4 Front Panel Terminal Connections volts and 1 amp would require a load resistance of 25 Q at the rated output voltage The wattage rating of this resistor would have to be at least 25 watts Electronic Load Some of the performance test procedures require to use an electronic load to test the supply quickly and accurately An electronic load is considerably easier to use than a load resistor It eliminates the need for connecting resistors or rheostats in parallel to handle the power and it is much more stable than a carbon pile load It is easier to switch between load conditions as required for the load regu lation and load transient response tests Output Current Measurement For accurate output current measurements a current sampling resistor should be inserted between the load and the output of the supply To simplify grounding problems one end of this sampling resis tor should be connected to the same output terminal of the supply which will be shorted to ground An accurate voltmeter is then placed across the sampling resistor and the output current is calculat
48. to could result in damage to or destruction of part or all of the product Do not proceed beyond CAUTION sign until the indicated condi tions are fully understood and met CAUTION The NOTE sign denotes important infor mation It calls attention to a procedure practice condition or the like which is essential to highlight DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT Because of the danger of introducing additional hazards do not install substitute parts or perform any unauthorized modi fication to the instrument Return the instrument to a 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 against unintended operation until they can be repaired by qualified service personnel 1 2 Table of Contents SAFETY SUMMARY Se ee Ate sete Qi m s s 1 2 GENERAL INFORMATION drenere 1 4 DESCRIPTION z greet EET anal Aa ES 1 4 SAFETY CONSIDERATIONS a des Son en ete ee ee Wea eke 1 4 SAFETY AND EMC 5 eee 1 4 INSTRUMENT AND MANUAL IDENTIFICATION 1 4 OPTIONS 55 f reser aaa 04 ee KS Se ae ee 1 4 AGGESSORY teas tee ete Soren be pet ected Woes are Gage 1 4 ORDERING A
49. ubleshooting procedures if you observe any out of specification performance A 3 CAUTION Before applying power to the supply make certain that its line voltage selector switch S1 is set for the line voltage to be used See CAUTION notice in operating section for additional information on S1 General Measurement Techniques Connecting Measuring Devices To achieve valid results when measuring load regulation ripple and noise and transient response time of the supply measuring devices must be con nected as close to the output terminals as possible A measure ment made across the load includes the impedance of the leads to the load The impedance of the load leads can easily be sev eral orders of magnitude greater than the supply impedance and thus invalidate the measurement To avoid mutual coupling effects each measuring device must be connected directly to the output terminals by separate pairs of leads When performance measurements are made at the front ter minals Figure A 4 the load should be plugged into the front of the terminals at B while the monitoring device is con nected to a small lead or bus wire inserted through the hole in the neck of the binding post at A Connecting the measuring device at B would result in a measurement that includes the resistance of the leads between the output terminals and the point of connection Selecting Load Resistors Power supply specifications are checked wi
50. ut 230 10 47 63 Hz Input OE9 100 Vac 10 47 63 Hz Input ACCESSORY The accessory listed below may be ordered from your local Agilent Technologies Sales Office either with the power sup ply or separately Refer to the list at the rear of the manual for address Agilent Part No Description 5063 9240 Rack Kit for mounting one or two 3 1 2 high supplies in a standard 19 rack The rack mount kit is needed for rack mounting of the E3620A power supply ORDERING ADDITIONAL MANUALS One manual is shipped with each power supply Option OL2 is ordered for each extra manual Additional manuals may also be purchased separately for your local Agilent Technolo gies sales office see the list at the rear of this manual for addresses Specify the Agilent Part Number provided on the title page SPECIFICATIONS Instrument specifications are listed in Table 1 These specifi cations are performance standards or limits against which the instrument is tested LINE FUSE The line fuse is located by the ac line receptacle Check the rating of the line fuse and replace it with the correct fuse if necessary as indicated below These are slow blow fuses Line Voltage Fuse Agilent Part No 100 115 Vac 2 2110 0702 230 1 2110 0457 Table 1 Specifications AC INPUT 115 Vac 10 47 63 Hz 200 VA 130 W 100 Vac 10 47 63 Hz 200 VA 130 W 230 Vac 10 47 63 Hz 200 VA 130 W DC OUTPUT Voltage span over wh
51. y When the TRIAG is not fired the bridge diode CR4 conducts and half the voltage is applied to series pass transistor Q2 The regulator of the V2 output is in turn similar to that of the V1 output regulator except that it has two TRIACs Q3 and Q4 and two bridge diodes CR2 and to allow the input capacitors to be charged to one of four discrete voltage levels depending on the output required in order to minimize power dissipation in the series regulator transistor Q1 The main secondary winding of the power transformer has three sections N1 and N3 each of which has a different turns ratio with respect to the primary winding At the begin ning of each half cycle of the input ac the control circuit determines whether one both or none of the TRIAC will be fired If neither TRIAC is fired the bridge diodes CR2 and receive an ac input voltage that is determined by 1 turns tap 18 and 19 of the power transformer and the input capacitors charge to a corresponding level If TRIAC Q3 is fired input capacitors charge to the voltage determined by N1 N2 turns Similarly if TRIAC Q4 is fired the capacitors are charged by N1 N3 Finally if all TRIACs are fired simulta neously input capacitors charge to its highest voltage level determined by 1 2 N3 turns tap 17 and 20 of the power transformer The TRIAC control circuit determines which TRIACs are to be fired by monitoring the output voltage and comparing th
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