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Tutorial

The Agilent E3631A is a high performance instrument capable of delivering
clean dc power. But to take full advantage of the performance characteristics
designed into the power supply, certain basic precautions must be observed
when connecting it for use on the lab bench or as a controlled power supply.
This chapter describes basic operation of linear power supplies and gives
specific details on the operation and use of the Agilent E3631A DC power
supply:

• Overview of Agilent E3631A Operation, page 139

• Output Characteristics, page 141

• Connecting the Load, page 145

• Extending the Voltage Range, page 148

• Remote Programming, page 149

• Reliability, page 151

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Содержание E3631-90002

Страница 1: ...er E3631 90002 April 2000 For Safety information Warranties and Regulatory information see the pages behind the Index Copyright Agilent Technologies Inc 2000 All Rights Reserved Agilent E3631A Triple...

Страница 2: ...nob control for voltage and current settings Highly visible vacuum fluorescent display for voltage and current meters Tracking operation for 25V outputs Excellent load and line regulation and low ripp...

Страница 3: ...racking enable disable key 3 Display limit key 4 Recall operating state key 5 Store operating state Local key 6 Error Calibrate key 7 I O Configuration Secure key 8 Output On Off key 9 Control knob 10...

Страница 4: ...calibration or enables calibration mode the power supply must be unsecured before performing calibration 7 I O Configuration Secure key3 Configures the power supply for remote interfaces or secure an...

Страница 5: ...nge the blinking digit to the desired value using the control knob 5 Press the key to enable the output After about 5 seconds the display will go to the output monitor mode automatically to display th...

Страница 6: ...CAL power supply is in calibration mode Track The outputs of 25V and 25V supplies are in track mode Limit The display shows the voltage and current limit value of a selected supply ERROR Hardware or...

Страница 7: ...interface see chapter 3 Set the GPIB bus address see chapter 3 Set the RS 232 baud rate and parity see chapter 3 1 Power line voltage setting 2 Power line fuse holder assembly 3 AC inlet 4 Power line...

Страница 8: ...eference Chapter 4 contains reference information to help you program the power supply over the remote interface This chapter also explains how to program for status reporting Error Messages Chapter 5...

Страница 9: ...8...

Страница 10: ...22 Chapter 2 Initial Operation Preliminary Checkout 27 Power On Checkout 28 Output Checkout 29 Voltage Output Checkout 29 Current Output Checkout 31 Chapter 3 Front Panel Operation Front Panel Operati...

Страница 11: ...ol 56 RS 232 Troubleshooting 57 Calibration Overview 58 Calibration Security 58 Calibration Count 62 Calibration Message 62 Chapter 4 Remote Interface Reference SCPI Command Summary 65 Simplified Prog...

Страница 12: ...sing the Message Available Bit MAV 96 To Interrupt Your Bus Controller Using SRQ 96 To Determine When a Command Sequence is Completed 97 Using OPC to Signal When Data is in the Output Buffer 97 Status...

Страница 13: ...35 Chapter 7 Tutorial Overview of Agilent E3631A Operation 139 Output Characteristics 141 Unregulated State 143 Unwanted Signals 143 Connecting the Load 145 Output Isolation 145 Multiple Loads 145 Loa...

Страница 14: ...1 1 General Information...

Страница 15: ...vides a general description of your power supply This chapter also contains instructions for initial inspection location and cooling for bench and rack operation selecting the power line voltage and c...

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Страница 17: ...t voltage 1CM Rack mount kit Agilent part number 5062 3957 0L2 Extra English manual set local language manual files are included on the CD ROM Agilent part number 5964 8251 Accessories The accessories...

Страница 18: ...nable or disable three outputs calibrate the power supply including changing the calibration security return the power supply to local operating mode and configure the power supply for remote interfac...

Страница 19: ...sitive and negative terminals of each output can be grounded or each output can be kept within 240 Vdc from the chassis ground The power supply is shipped with a detachable 3 wire grounding type power...

Страница 20: ...dents and scratches and that the display is not scratched or cracked Electrical Check Chapter 2 describes an initial operation procedure which when successfully completed verifies to a high level of...

Страница 21: ...on 1CM P N 5063 9243 Installation instructions and hardware are included with each rack mounting kit Any Agilent System II instrument of the same size can be rack mounted beside the Agilent E3631A pow...

Страница 22: ...lation 21 1 To rack mount two instruments of the same depth side by side order lock link kit 5061 9694 and flange kit 5063 9214 To install two instruments in a sliding support shelf order support shel...

Страница 23: ...that has a plug appropriate for your location Contact the nearest Agilent Sales and Service Office if the wrong power line cord is included with your power supply Your power supply is equipped with a...

Страница 24: ...y with a flat blade screwdriver from the rear panel 2 Install the correct line fuse Remove the power line voltage selector from the power line module 3 Rotate the power line voltage selector until the...

Страница 25: ...24...

Страница 26: ...2 2 Initial Operation...

Страница 27: ...sures that the power supply develops its rated outputs and properly responds to operation from the front panel For complete performance and or verification tests refer to the Service Guide This chapte...

Страница 28: ...is installed The correct fuse is installed for your country when the power supply is shipped from the factory For 100 or 115 Vac operation you must use a 2 5 AT fuse For 230 Vac operation you must use...

Страница 29: ...ddress may appear See Remote Interface Configuration for more information starting on page 48 in chapter 3 if you need to change the remote interface configuration 3 The OFF and 6V annunciators are on...

Страница 30: ...ed for voltage control 2 Enable the outputs The OFF annunciator turns off and the 6V and CV annunciators are lit The blinking digit can be adjusted by turning the knob Notice that the display is in th...

Страница 31: ...is still lit and the 25V annunciator will turn on Repeat steps 3 and 4 to check the voltage function for the 25V supply 6 Check the voltage function for the 25V supply Select the meter and adjust sele...

Страница 32: ...istance of the test lead The blinking digit can be adjusted by turning the knob Notice that the display is in the meter mode Meter mode means that the display shows the actual output voltage and curre...

Страница 33: ...and adjust selection key for the 25V supply 8 Check the current function for the 25V supply Disable the outputs by pressing the key and connect a short across and COM output terminals of 25V supply wi...

Страница 34: ...3 3 Front Panel Operation...

Страница 35: ...Front Panel Operation Overview page 35 Constant Voltage Operation page 36 Constant Current Operation page 38 Tracking Operation page 40 Storing and Recalling Operating States page 41 Disabling the Ou...

Страница 36: ...will be displayed In this mode you can also observe the change of the limit values when adjusting the knob If you press the key again or let the display time out after several seconds the power supply...

Страница 37: ...eans that the display shows the actual output voltage and current To set up the power supply for 25V supply or 25V supply operation you should press the or key to select the display and adjust for 25V...

Страница 38: ...ode In the meter mode the display shows the actual output voltage and current of the selected supply 8 Verify that the power supply is in the constant voltage mode If you operate the 6V supply in the...

Страница 39: ...e means that the display shows the actual output voltage and current To set up the power supply for 25V supply or 25V supply operation you should press the or key to select the display and adjust for...

Страница 40: ...ter mode the display shows the actual output voltage and current of the selected supply 8 Verify that the power supply is in the constant current mode If you operate the 6V supply in the constant curr...

Страница 41: ...be depressed for at least 1 second to enable the track mode When the track mode is first enabled the 25V supply will be set to the same voltage level as the 25V supply Once enabled any change of the v...

Страница 42: ...nd recall an operating state 1 Set up the power supply for the desired operating state The storage feature remembers the display and knob selection state the limit values of voltage and current for th...

Страница 43: ...for approximately 3 seconds 6 Recall the stored operating state Turn the knob to the right to change the displayed storage location to 3 If this setting is not followed within 3 seconds with a key str...

Страница 44: ...VLQJ WKH NH 7KLV NH WRJJOHV EHWZHHQ WKH RXWSXW 2II DQG 2Q VWDWHV 5HPRWH LQWHUIDFH RSHUDWLRQ OUTPut ON OFF 7KH RXWSXWV DUH GLVDEOHG ZKHQ WKH 2 SDUDPHWHU LV VHOHFWHG DQG HQDEOHG ZKHQ WKH 21 LV VHOHFWHG...

Страница 45: ...nciator turns on A complete self test performs a series of tests and takes approximately 2 seconds to execute If all tests pass you can have a high confidence that the power supply is operational If t...

Страница 46: ...pply over the remote interface the last error stored in the queue the most recent error is replaced with 350 Too many errors No additional errors are stored until you remove errors from the queue If n...

Страница 47: ...ace The power supply can display up to 12 characters of the message on the front panel any additional characters are truncated Commas periods and semicolons share a display space with the preceding ch...

Страница 48: ...the input output processor and the third is for the front panel processor Remote interface operation IDN Returns HEWLETT PACKARD E3631A 0 X X X X X X Be sure to dimension a string variable with at le...

Страница 49: ...n non volatile memory and does not change when power has been off or after a remote interface reset If you select the GPIB interface you must select a unique address for the power supply The current a...

Страница 50: ...dress 21 Baud Rate Selection RS 232 You can select one of six baud rates for RS 232 operation The rate is set to 9600 baud when the power supply is shipped from the factory The baud rate can be set fr...

Страница 51: ...if the power supply has been changed from the default setting 3 Turn the knob to change the GPIB address The displayed address is changed when turning the knob to the right or left 4 Save the change a...

Страница 52: ...the RS 232 interface by turning the knob to the left 3 Select the RS 232 interface and choose the baud rate The rate is set to 9600 baud when the power supply is shipped from the factory Choose from o...

Страница 53: ...hen power has been off or after a remote interface reset The power supply displays a message to show that the change is now in effect If the baud rate and the parity are not changed NO CHANGE will be...

Страница 54: ...or both as long as the following rules are observed The total number of devices including the computer is no more than 15 The total length of all the cables used is no more than 2 meter times the numb...

Страница 55: ...n Overview Configure the RS 232 interface using the parameters shown below Use the front panel key to select the baud rate parity and number of data bits see page 51 for more information to configure...

Страница 56: ...r configuration you may have to use a wiring adapter If you are using a DTE to DTE cable make sure the adapter is a straight through type Typical adapters include gender changers null modem adapters a...

Страница 57: ...ne FALSE the data must cease within 10 characters To disable the DTR DSR handshake do not connect the DTR line and tie the DSR line to logic TRUE If you disable the DTR DSR handshake also select a slo...

Страница 58: ...r supply to complete the transmission You can break the interface deadlock by sending the Ctrl C character which clears the operation in progress and discards pending output this is equivalent to the...

Страница 59: ...the remote interface the security code may contain up to 12 alphanumeric characters as shown below The first character must be a letter but the remaining characters can be letters or numbers You do no...

Страница 60: ...r the security code using the knob and resolution selection keys and then press the key When you press the key to save the change you will see the message below for one second if the security code is...

Страница 61: ...power supply press the key after the CAL MODE message is displayed in the calibration mode enter the security code using the knob and resolution selection keys and then press key Notice that you shou...

Страница 62: ...he key after the CAL MODE message is displayed in the calibration mode enter the new security code using the knob and resolution selection keys then press the key Changing the code from the front pane...

Страница 63: ...unts Remote Interface Operation CALibrate COUNt Calibration Message You can use the calibration message feature to record calibration information about your power supply For example you can store such...

Страница 64: ...4 4 Remote Interface Reference...

Страница 65: ...ands page 85 RS 232 Interface Commands page 87 The SCPI Status Registers page 88 Status Reporting Commands page 98 An Introduction to the SCPI Language page 102 Halting an Output in Progress page 107...

Страница 66: ...sections in this chapter for more complete details on each command Throughout this manual the following conventions are used for SCPI command syntax Square brackets indicate optional keywords or para...

Страница 67: ...OFF ON TRACk STATe SOURce CURRent LEVel IMMediate AMPLitude current MIN MAX CURRent LEVel IMMediate AMPLitude MIN MAX CURRent LEVel TRIGgered AMPLitude current MIN MAX CURRent LEVel TRIGgered AMPLitud...

Страница 68: ...TEXT CLEar SYSTem BEEPer IMMediate ERRor VERSion IDN RST TST SAV 1 2 3 RCL 1 2 3 CALibration COUNt CURRent DATA numeric value CURRent LEVel MIN MAX SECure CODE new code SECure STATe OFF ON code SECur...

Страница 69: ...t ENABle enable value INSTrument ENABle INSTrument ISUMmary n EVENt INSTrument ISUMmary n CONDition INSTrument ISUMmary n ENABle enable value INSTrument ISUMmary n ENABle SYSTem ERRor CLS ESE enable v...

Страница 70: ...apter 4 Remote Interface Reference SCPI Command Summary 69 4 CLS ESE enable value ESE ESR IDN OPC OPC PSC 0 1 PSC RST SAV 1 2 3 RCL 1 2 3 SRE enable value SRE STB TRG TST WAI IEEE 488 2 Common Command...

Страница 71: ...trings and entering data Using the APPLy Command The APPLy command provides the most straightforward method to program the power supply over the remote interface For example the following statement ex...

Страница 72: ...ement Enter error string into computer print statement Print error string Selecting a Trigger Source The power supply will accept a bus software trigger or an immediate internal trigger as a trigger s...

Страница 73: ...ts the programming ranges output names and output numbers for each output Refer to this table to identify parameters when programming the power supply Table 4 1 Agilent E3631A Programming Ranges and O...

Страница 74: ...he selected output MAX selects the highest voltage and current values allowed The default voltage values are 0 volts for all outputs The default current values are 5 A for 6V output and 1 A for 25V ou...

Страница 75: ...an output When one output is selected the other outputs are unavailable for programming until selected The commands which are affected by the INSTrument command are output setting commands SOURce meas...

Страница 76: ...ff before the 25V supplies can be coupled INST COUP The following program segment shows how to use the INSTrument COUPle command to couple two outputs between the 6V and the 25V outputs with voltage a...

Страница 77: ...easurement Commands MEASure CURRent DC P6V P25V N25V This command queries the current measured at the output terminals of the power supply The physical outputs of measurement are specified by the outp...

Страница 78: ...ply Once enabled any change of the programmed voltage level in either 25V supply or 25V supply will be reflected in the other supply The TRACk OFF command returns the power supply to the non track mod...

Страница 79: ...e level of the power supply The immediate level is the voltage limit value of the selected output with the INSTrument command SOURce VOLTage LEVel IMMediate AMPLitude MINimum MAXimum This query return...

Страница 80: ...start of any corresponding output change Notice that the time delay is valid for only the bus trigger source Finally you must provide an INITiate IMMediate command If the IMMediate source is selected...

Страница 81: ...rigger is accepted and is executed before the second trigger is recognized TRIG SOUR BUS TRG WAI TRG WAI You can use the OPC operation complete query command or the OPC operation complete command to s...

Страница 82: ...0 seconds At RST this value is set to 0 seconds TRIGger SEQuence DELay This command queries the trigger delay TRIGger SEQuence SOURce BUS IMMediate This command selects the source from which the power...

Страница 83: ...This command queries the front panel display setting Returns 0 OFF or 1 ON DISPlay WINDow TEXT DATA quoted string This command displays a message on the front panel The power supply will display up t...

Страница 84: ...ror The error queue is cleared when power has been off or after a CLS clear status command has been executed The RST reset command does not clear the error queue SYSTem VERSion This command queries th...

Страница 85: ...error message is also generated with additional information on why the test failed SAV 1 2 3 This command stores the present state of the power supply to the specified location in non volatile memory...

Страница 86: ...reading an external meter You must first select a calibration level CAL CURR LEV for the value being entered Two successive values one for each end of the calibration range must be selected and entere...

Страница 87: ...Ring This command queries the calibration message and returns a quoted string CALibration VOLTage DATA numeric value This command can only be used after calibration is unsecured It enters a voltage va...

Страница 88: ...on the front panel except the Local key are disabled SYSTem RWLock This command places the power supply in the remote mode for RS 232 operation This command is the same as the SYSTem REMote command e...

Страница 89: ...tically cleared by a query of that register such as ESR or STAT QUES EVEN or by sending the CLS clear status command A reset RST or device clear will not clear bits in event registers Querying an even...

Страница 90: ...ch a status register configuration allows a status event to be cross referenced by output and type of event The INSTrument register indicates which output s have generated an event The ISUMmary regist...

Страница 91: ...4 Remote Interface Reference The SCPI Status Registers 90 SCPI Status System 20 1 21 2 22 4 23 8 24 16 25 32 26 64 27 128 28 256 29 512 210 1024 211 2048 212 4096 213 8192 214 16384 215 32768 Binary...

Страница 92: ...the 6V supply is in the constant voltage mode and looses regulation then bit 1 set indicating a possible overload in the 6V supply The 25V supply is reported as bit 2 and the 25V supply as bit 3 Send...

Страница 93: ...ted and both bits false indicates the outputs of the power supply are off The Questionable Status Event register is cleared when You execute the CLS clear status command You query the event register u...

Страница 94: ...or more errors in the power supply s error queue Read the error queue using the SYSTem ERRor command Bit Decimal Value Definition 0 OPC 1 Operation Complete All commands prior to and including an OPC...

Страница 95: ...tus Byte summary register reports conditions from the other status registers Query data that is waiting in the power supply s output buffer is immediately reported through the Message Available bit bi...

Страница 96: ...IEEE 488 service request SRQ interrupt to use this capability Use the Status Byte enable register SRE command to select which summary bits will set the low level IEEE 488 service request signal When...

Страница 97: ...ardware and will be executed only after previous commands have completed Polling is not possible using the STB command Executing the STB command does not clear the Status Byte summary register Using t...

Страница 98: ...0 is set in the Standard Event register 6 Use a serial poll to check to see when bit 5 standard event is set in the Status Byte summary register You could also configure the power supply for an SRQ in...

Страница 99: ...s have occurred the last error stored in the queue the most recent error is replaced with 350 Too many errors No additional errors are stored until you remove errors from the queue If no errors have o...

Страница 100: ...pecified by a numeric value n is 1 2 or 3 See Table 4 1 on page 72 for the output number The event register is a read only register which holds latches all events Reading the Questionable Instrument I...

Страница 101: ...d sum of all bits in the register ESR This command queries the Standard event register The power supply returns a decimal value which corresponds to the binary weighted sum of all bits in the register...

Страница 102: ...its set in the register STB This command queries the Status Byte summary register The STB command is similar to a serial poll but it is processed like any other instrument command The STB command retu...

Страница 103: ...s are based on a hierarchical structure also known as a tree system In this system associated commands are grouped together under a common node or root thus forming subsystems A portion of the SOURce...

Страница 104: ...ing The braces are not sent with the command string A vertical bar separates multiple parameter choices for a given command string Triangle brackets indicate that you must specify a value for the encl...

Страница 105: ...the following two commands SOUR VOLT MIN SOUR CURR MAX Use a colon and a semicolon to link commands from different subsystems For example in the following command string an error is generated if you d...

Страница 106: ...ot avoid this situation send a device clear before sending the second query command SCPI Command Terminators A command string sent to the power supply must terminate with a new line character The IEEE...

Страница 107: ...meters Discrete parameters are used to program settings that have a limited number of values like BUS IMM Query responses will always return the short form in all upper case letters The following comm...

Страница 108: ...ce clear over the GPIB interface using Agilent BASIC CLEAR 705 IEEE 488 Device Clear The following statement shows how to send a device clear over the GPIB interface using the GPIB Command Library for...

Страница 109: ...mmands that are used by the power supply SCPI Confirmed Commands DISPlay WINDow STATe OFF ON WINDow STATe WINDow TEXT DATA quoted string WINDow TEXT DATA WINDow TEXT CLEar INSTrument SELect P6V P25V N...

Страница 110: ...QUEStionable INSTrument ENABle enable value QUEStionable INSTrument ENABle QUEStionable INSTrument ISUMary n EVENt QUEStionable INSTrument ISUMary n CONDition QUEStionable INSTrument ISUMary n ENABle...

Страница 111: ...mind and they follow all of the command syntax rules defined by the standard Non SCPI Commands APPLy P6V P25V N25V voltage DEF MIN MAX current DEF MIN MAX APPLy P6V P25V N25 CALibration COUNt CURRent...

Страница 112: ...N Remote Enable SRQ Service Request Enable Addressed Commands DCL Device Clear EOI End or Identify GET Group Execute Trigger GTL Go To Local LLO Local Lockout SDC Selected Device Clear SPD Serial Poll...

Страница 113: ...112...

Страница 114: ...5 5 Error Messages...

Страница 115: ...350 Too many errors No additional errors are stored until you remove errors from the queue If no errors have occurred when you read the error queue the supply responds with 0 No error over the remote...

Страница 116: ...a colon semicolon or blank space or you may have used a blank space instead of a comma Example TRIG SOUR BUS or APPL P6V 1 0 1 0 104 Data type error The wrong parameter type was found in the command s...

Страница 117: ...lue Example ESE B01010102 123 Numeric overflow A numeric parameter was found whose exponent was larger than 32 000 124 Too many digits A numeric parameter was found whose mantissa contained more than...

Страница 118: ...ave enclosed the character string in single or double quotes Example DISP TEXT ON 158 String data not allowed A character string was received but is not allowed for the command Check the list of param...

Страница 119: ...rted See also Self Test Errors starting on page 120 350 Too many errors The error queue is full because more than 20 errors have occurred No additional errors are stored until you remove errors from t...

Страница 120: ...232 overrun error 513 RS 232 parity error 514 Command allowed only with RS 232 There are three commands which are only allowed with the RS 232 interface SYSTem LOCal SYSTem REMote and SYSTem RWLock 5...

Страница 121: ...rite failed 603 A D sync stuck 604 A D slope convergence failed 605 Cannot calibrate rundown gain 606 Rundown gain out of range 607 Rundown too noisy 608 Serial configuration readback failed 624 Unabl...

Страница 122: ...he power supply as was used to secure it and vice versa The security code may contain up to 12 alphanumeric characters The first character must be a letter 704 Secure code too long A security code was...

Страница 123: ...al checksum failed store recall data in location 1 743 Cal checksum failed store recall data in location 2 744 Cal checksum failed store recall data in location 3 745 Cal checksum failed DAC cal const...

Страница 124: ...6 6 Application Programs...

Страница 125: ...the power supply is shipped from the factory The example programs in this chapter assume an GPIB address of 05 When sending a command over the remote interface you append this address to the GPIB int...

Страница 126: ...to store the instrument configuration in memory 50 60 ASSIGN Psup TO 705 Assign I O path to address 705 70 CLEAR 7 Clear interface send device clear 80 OUTPUT Psup RST CLS Reset and clear the power su...

Страница 127: ...IB address for power supply Function Prototypes void rst_clear void void out_setting void void output_on void void command_exe char commands int length void state_save void void check_error char func_...

Страница 128: ...lts 1 0 amp to 25V output APPL N25V 10 0 0 8 Set 10 0 volts 0 8 amp to 25V output Call the function to execute the command strings shown above command_exe cmd_string sizeof cmd_string sizeof char Call...

Страница 129: ...PUTS ADDR SYST ERR 9 Read the error queue IOENTERS ADDR message length Enter error string while atoi message 0 Loop until all errors are read printf Error s in function s n n message func_name IOOUTPU...

Страница 130: ...NST COUP TRIG ALL Couple three outputs 120 OUTPUT Psup TRIG SOUR BUS Trigger source is bus 130 OUTPUT Psup TRIG DEL 30 Time delay 30 seconds 140 150 OUTPUT Psup INST SEL P6V Select 6V output 160 OUTPU...

Страница 131: ...ERR THEN ERROR PCIB BASERR CALL IORESET ISC Reset the Agilent 82335 GPIB card IF PCIB ERR NOERR THEN ERROR PCIB BASERR CALL IOCLEAR Dev Send a device clear to the power supply IF PCIB ERR NOERR THEN E...

Страница 132: ...T TRIG 20 Set the pending voltage to 20 volts Length1 LEN Info1 CALL IOOUTPUTS Dev Info1 Length1 IF PCIB ERR NOERR THEN ERROR PCIB BASERR Info1 CURR TRIG 0 9 Set the pending current to 0 9 amps Length...

Страница 133: ...nfo1 Length1 IF PCIB ERR NOERR THEN ERROR PCIB BASERR Info1 TRG Set output changes after time delay Length1 LEN Info1 CALL IOOUTPUTS Dev Info1 Length1 IF PCIB ERR NOERR THEN ERROR PCIB BASERR Info1 IN...

Страница 134: ...med to output a 3V 0 5A for 6V output 50 10V 0 8A for 25V output and 15V 0 2A for 25V output 60 70 ASSIGN Psup TO 705 Assign I O path to address 705 80 COM Psup Use same address in subprogram 90 INTEG...

Страница 135: ...OUTPUT Psup OPC Verify previous commands has executed 360 370 OFF INTR Gpib Disable interrupts 380 END 390 400 410 420 SUB Err_msg Error subprogram is called if errors occurred 430 DIM Message 80 Dim...

Страница 136: ...es for input buffer OPEN com1 9600 n 8 2 rs cd lf pe FOR RANDOM AS 1 LEN 1000 Put the power supply into the remote operation mode PRINT 1 SYST REM Reset and clear the power supply PRINT 1 RST CLS Quer...

Страница 137: ...136...

Страница 138: ...7 7 Tutorial...

Страница 139: ...bserved when connecting it for use on the lab bench or as a controlled power supply This chapter describes basic operation of linear power supplies and gives specific details on the operation and use...

Страница 140: ...in a constant output voltage Because the variable resistance of Figure 7 1 is actually one or more power transistor operating in the linear class A mode supplies with this type of regulator are often...

Страница 141: ...is controlled by a control circuit that provides voltages to program the outputs Each supply sends back to the control circuit voltages representing outputs at the terminals The control circuits rece...

Страница 142: ...ly Power Supply The ideal constant current power supply exhibits an infinite output impedance at all frequencies Thus as Figure 7 4 indicates the ideal constant current power supply would accommodate...

Страница 143: ...oad at point 1 has a relatively high resistance value compared to RC the output voltage is at the voltage setting and the output current is less than the current setting In this case the power supply...

Страница 144: ...nt noise Normal mode voltage noise is in the form of ripple related to the line frequency plus some random noise Both of these are of very low value in the Agilent E3631A Careful lead layout and keepi...

Страница 145: ...tact is closed the inductance in the hook up wire and in the power supply output will cause a spike to appear at the load The spike is a function of the rate of change of the load current When very ra...

Страница 146: ...utput impedance of the power supply Each pair of wires should be as short as possible and twisted or shielded to reduce lead inductance and noise pick up If a shield is used connect one end to the pow...

Страница 147: ...le 7 2 Slew Rate Inductive loading Inductive loads present no loop stability problems in constant voltage mode In constant current mode inductive loads form a parallel resonance with the power supply...

Страница 148: ...urrent into the supply without risking loss of regulation and possible damage These effects can be avoided by preloading the output with a dummy load resistor The dummy load resistor should draw at le...

Страница 149: ...o obtain a higher voltage than that available from a single supply Series connected power supplies can be operated with one load across both power supplies or with a separate load for each power suppl...

Страница 150: ...tput is programmed the power supply regulator circuit senses that the output is less than desired and turns on the series regulator to its maximum value IL the current limit or constant current settin...

Страница 151: ...e control circuit can in no way cause the series regulator transistors to conduct backwards the output capacitor can only be discharged through the load resistor and internal current source IS The out...

Страница 152: ...rcuitry to reduce the internal power dissipation of the power supply and therefore reduce the internal heat of the power supply Maximum internal power dissipation occurs at maximum current The interna...

Страница 153: ...152...

Страница 154: ...8 8 Specifications...

Страница 155: ...ature range of 0 to 40 C with a resistive load Supplemental characteristics which are not warranted but are descriptions of performance determined either by design or testing The service guide contain...

Страница 156: ...tput Voltage 0 1 5 mV 0 05 10 mV 0 05 10 mV Current 0 2 10 mA 0 15 4 mA 0 15 4 mA Ripple and Noise with outputs ungrounded or with either output terminal grounded 20 Hz to 20 MHz 6V Output 25V Output...

Страница 157: ...utput Voltage 1 mV 10 mV 10 mV Current 1 mA 1 mA 1 mA Transient Response Time Less than 50 msec for output recover to within 15 mV following a change in output current from full load to half load or v...

Страница 158: ...e and ambient temperature 6V Output 25V Output 25V Output Voltage 0 03 1 mV 0 02 2 mV 0 02 2 mV Current 0 1 3 mA 0 05 1 mA 0 05 1 mA Voltage Programming Speed Maximum time required for output voltage...

Страница 159: ...wer output plus overshoot will not exceed 1 V if the output control is set to less than 1 V If the output control is set to 1 V or higher there is no overshoot Programming Language SCPI Standard Comma...

Страница 160: ...Chapter 8 Specifications Supplemental Characteristics 159 8 Figure 8 1 Dimensions of Agilent E3631A Power Supply...

Страница 161: ...160...

Страница 162: ...tion SECure STATe 86 CALibration STRing 86 CALibration STRing 86 CALibration VOLTage 86 CALibration VOLTage LEVel 86 CURRent 77 CURRent TRIGgered 78 CURRent 77 DISPlay 82 DISPlay TEXT 82 DISPlay TEXT...

Страница 163: ...erface RS 232 48 K key Calibrate 59 Display Limit 35 I O Config 6 Local 35 On Off 43 Secure 59 Track 40 key descriptions 3 keyword root 102 second level 102 third level 102 knob locking 43 L limit mod...

Страница 164: ...and terminator 105 SCPI confirmed command 108 SCPI conformance 108 SCPI language 102 SCPI parameter 106 SCPI status register 88 SCPI version 47 SCPI version query 47 self test 44 self test error 120 s...

Страница 165: ...implied warranty or condition of merchantability fitness for a particular purpose or satisfactory quality For transactions in Austra lia and New Zealand The warranty terms contained in this statement...

Страница 166: ...31A 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 includin...

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