Agilent Technologies Agilent E3616A Serials KR83502651 Maintenance, Test Equipment Required

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series pass transistors. Whenever the output voltage is below the sloping V1 line, the control circuit inhibits four SCRs 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.

Figure A-2. Output Power Plot

The series regulators (Q1 and Q4) are part of a feedback loop which consists of the driver and the Constant Voltage/Con- stant Current error amplifier. The series regulator feedback loop provides "fine and fast" regulation of the output while the preregulator feedback loop handles large, relatively slow, reg- ulation demands.

The regulator is made to alter its conduction to maintain a constant output voltage or current. The voltage developed across the current sampling resistors (R58 and R59) is the input to the constant current error amplifier. The constant volt- age error amplifier obtains its input by sampling the output voltage of the supply.

Any changes in output voltage or current are detected and amplified by the constant voltage or constant current error cir- cuit and applied to the series regulator in the correct phase and amplitude to counteract the change in output voltage or current.

Two error amplifiers are included in a CV/CC supply, one for controlling output voltage, the other for controlling output cur- rent. Since the constant voltage amplifier tends to achieve zero output impedance and alters the output current when- ever the load resistance changes, while the constant current amplifier causes the output impedance to be infinite and changes the output voltage in response to any load resis- tance change, it is obvious that the two amplifiers can not operate simultaneously. For any given value of load resis- tance, the power supply must act either as a constant voltage source or as a constant current source - it can not be both; transfer between these two modes is accomplished at a value of load resistance equal to the ratio of the output voltage con- trol setting to the output current control setting.

Full protection against any overload condition is inherent in the Constant Voltage/Constant Current design principle since there is not any load condition that can cause an output which lies outside the operating region. For either constant voltage or constant current operation, the proper choice of front panel voltage and current control settings insures optimum pro- tection for the load device as well as full protection for the power supply.

The reference and bias circuit provides stable reference volt- ages which are used by the constant voltage/current error amplifier circuits for comparison purpose. The display circuit provides an indication of output voltage and current for con- stant voltage or constant current operating modes.

An operator error or a component failure within the regulating feedback loop can drive a power supply's output voltage to many times its preset value. The overvoltage protection cir- cuit is to protect the load against this possibility. The circuit insures that the power supply voltage across the load will never exceed a preset limit.

Diode CR19 is connected across the output terminals in reverse polarity. It protects the output electrolytic capacitor and the series regulator transistors from the effects of a reverse voltage applied across the output terminals.

The display power circuit provides voltage which is used by A/ D converter and LED drive.

MAINTENANCE

INTRODUCTION

This section provides performance test and calibration proce- dures and troubleshooting information. The following opera- tion 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

The following Table A-1 lists the equipment required to perform the tests and adjustments of this section. You can separately identify the equipment for performance tests, calibration, and troubleshooting in the USE column of the table.

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-2

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Contents Agilent E361xA 60W Bench Series DC Power Supplies Safety Summary Operating Instructions General Information Operating Temperature Range Meter Programming ResolutionTemperature Coefficient Line FuseInstallation Installation DataInput Power Requirements Initial InspectionTURN-ON Checkout Procedure Power CordOperating Instructions IntroductionLocal Operating Mode Connecting LoadsOperating Modes Operation Beyond Rated OutputRemote Voltage Sensing Remote Operating ModesRemote Analog Voltage Programming Normal Parallel Operation MULTIPLE-SUPPLY OperationAUTO-PARALLEL Operation Normal Series Operation Gramming according to the remote-programming instructionsAUTO-SERIES Operation Total output voltage to ground must not exceed 240 VdcAUTO-TRACKING Operaton = slave output voltageLoad Considerations Service Information Test Equipment Required MaintenanceOperation Verification Tests Performance Tests Type Required Characteristics USE Recommended ModelMeasurement Techniques Constant Voltage CV Tests Load Regulation Load EffectLine Regulation Source Effect Load Transient Response TimePardrms Measurement PARDRipple and NoisePARDPeak-to-Peak Measurement Constant Current CC Tests CV Drift StabilityAdjustment and Calibration Procedure CC Drift StabilityTroubleshooting Overall Troubleshooting ProcedureReference and Bias Circuit Regulating Loop TroublesSymptom Checks and Probable Causes Overvoltage Protection Circuit TroublesStep Action Response Probable Cause Step Measure Response Probable Cause Replaceable Parts Table A-10. Replaceable Parts List Table A-10. Replaceable Parts List Contd R28,111 0698-3228 Resistor 49.9K +-1% .125W TF TC=0+-100 RESISTOR-VAR 10K +-10% ALL IC V RGLTR-FXD-POS 4.8/5.2V TO-220 PKG ALL DIODE-GEN PRP 180V 200MA DO-35 ALL Table A-11. Component Value Model Manual Supplement Constant Voltage Mode T EAlternative Voltage Programming Using Resistors Programming Voltage Common to the Minus OutputR1 and R2 should be in the 1KΩ to 100KΩ range 10-3 Constant Current Mode Constant Current with Voltage ProgrammingCurrent Monitoring Remote Resistor Programming Connections Remote Resistor Programming, Constant VoltageRemote Resistor Programming, Constant Current Certification Declaration of Conformity

Agilent E3614A Serials KR83503035, Agilent E3617A Serials KR83502522, Agilent E3615A Serials KR83506197, Agilent E3616A Serials KR83502651 specifications

Agilent Technologies is a leading player in the field of electronic test and measurement devices, providing essential tools for engineers and scientists. Among their array of power supplies, models such as the Agilent E3616A, E3615A, E3617A, and E3614A stand out for their exceptional performance, reliability, and technological features.

The Agilent E3616A is a precision DC power supply known for its ability to deliver a maximum output of 60V and 3A. Its serial number, KR83502651, signifies its unique identity. This model is particularly valued in laboratory environments due to its advanced programming capabilities. It offers a comprehensive range of output voltage and current settings, making it versatile for various applications. One of its main features is the built-in 6V at 3A output, which can be useful for testing other devices.

Similarly, the Agilent E3615A, with the serial number KR83506197, provides an excellent blend of performance and functionality. It is capable of delivering up to 30V and 3A across its outputs. This model excels in its low noise operation, which is crucial for sensitive electronics testing. Furthermore, the user-friendly interface allows for quick adjustments and settings retrieval, making it a favorite among engineers. The E3615A is designed to support a wide range of applications, from component testing to powering devices in research settings.

The Agilent E3617A, identifiable by its serial number KR83502522, is another high-performance model that offers a maximum output of 30V and up to 3A. It features built-in read-back capabilities, enabling engineers to monitor the actual voltage and current supplied to the load. The E3617A stands out for its programmable output, allowing automated testing sequences to be implemented with ease.

Lastly, the Agilent E3614A, with the serial number KR83503035, is a cost-effective option without sacrificing quality. This model offers an output of up to 30V and 3A while maintaining stability and precision. Its compact design makes it easy to integrate into crowded workspaces or test setups. The E3614A is designed for durability, ensuring reliable performance over time, making it an excellent choice for both education and industrial applications.

With their high-precision outputs, easy programmability, and user-friendly interfaces, these Agilent power supplies serve as essential tools for a variety of testing and research needs, reflecting Agilent Technologies' commitment to quality and innovation in electronic measurement solutions.
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