Agilent Technologies 6622A, 6621A, 6627A Protection Features, Operating Quadrants, Range Selection

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Operating Quadrants

Figure 4-2 shows the operating locus of your power supply in three quadrants. The area in quadrant 1 shows the operating locus defined by the voltage and current settings of each output. The characteristics shown for quadrant 1 incorporate remote sensing and include the maximum available sense voltage plus load lead drop. The area in quadrant 2 indicates the locus where each output can operate as a current sink. You cannot program current limit values in quadrant 2. (Figure 4-3 shows the current sink characteristics at voltages below 2.0 V in greater detail.) The area in quadrant 4 illustrates the reverse polarity diode characteristics of each output. Do not operate any output with reverse-voltage currents that are greater than the maximum rating of the output.

Notice that the L shaped characteristics in quadrant 1 of Figure l-l consists of two overlapping ranges-a high voltage/low current range, and a low voltage/high current range. The power supply always limits its settings to within the boundaries of these ranges. Attempting to program voltage or current values that are greater than the maximum programmable values for a given output results in an error message and the values are ignored by the supply.

Range Selection

When a voltage and current are specified, each of which is within the maximum programmable value but whose combination lies outside the L shaped operating locus, the power supply will automatically select the operating range based on the value of the last VSET or ISET parameter that was programmed. The other parameter will automatically be reprogrammed to the maximum rating of the selected range. Chapter 5 includes an example of automatic range selection (also referred to as range switching).

Once your power supply output is operating in a given range, it will not automatically switch to the other range because of a change in the load. The only time an output switches operating ranges is in response to a command from either the front panel or the GP-IB that changes the voltage or current settings. For the output to switch ranges, the voltage or current setting must specify a value that is inside the operating locus of the other range. If the value sent is common to both ranges, no range switching occurs.

Protection Features

Protective circuitry within the supply can limit or turn off an output in the event of an abnormal condition. The activated protection feature can be determined by observing the front panel display area. You can also read back the status of the supply over the GP-IB. The following protection features are implemented:

OVERVOLTAGE -- shorts the output by firing an SCR crowbar and sets zero volts and minimum current on an output if any of the following conditions are present:

1.The output voltage exceeds the programmed overvoltage trip point. or

2.The voltage from the +V output terminal to the + S terminal or from the -S terminal to the -V output terminal exceeds 1.5 V (applies to remote sensing only).

or

3. A trip signal is received on the output’s OV terminals.

or

4. The output’s fixed overvoltage circuit is activated.

The OV trip point can be programmed up to 23 V on a low voltage output and up to 55 V on a high voltage output. When an overvoltage occurs, the word OVERVOLTAGE appears in the front panel display and the OV status bit is set for that output. Chapter 5 explains how to program the overvoltage trip level.

44 Output Connections and Operating Information

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Contents Operating Manual Agilent Part NoCertification Safety Summary Safety Summary Environmental ConditionsDeclaration of Conformity EMCWhat this Manual Contains Table Of Contents Remote Operation Local OperationCalibration Command SummaryError Messages Programming With a Series 200/300 ComputerIntroduction Safety ConsiderationsGeneral Information Instrument and Manual IdentificationModel AccessoriesDescription Output Combinations AvailableBasic Operation GP-IB BoardOutput Boards Specifications Qualifying ConditionsDefinitions Output Response Characteristics Specifications Source EffectSupplemental Characteristics Outputs Low High Voltage Temperature CoefficientReadback Resolution OVPLow Voltage General Information General Information General Information General Information Installation Initial InspectionLocation and Cooling Input Power Requirements Line FuseGP-IB Line FusesPower Cord Line Voltage ConversionGP-IB Interface Connector Front Panel Controls and Indicators Getting StartedTurning On Your Supply 15V 35A Output Controls and Indicators Number Controls/lndicators Test Pattern of all Display Segments at Power-on Normal Self Test IndicationsChecking Out Your Supply Using Local Control Sample Self-Test Failure DisplayVoltage Test Overvoltage TestCurrent Test OCP Introduction To Remote OperationIset Enter RSTReading the GP-IB Address Sending a Remote CommandOutput AddrOften Used Commands Getting Data From The SupplyDisp a Disp a Returning the Supply to Local Mode Output Connections and Operating Information Output RangesProtection Features Operating QuadrantsRange Selection Typical Output Range Characteristics Connecting the Load Page Wire Size Wire Bundled 10 a 20 a AWGRemote Voltage Sensing Multiple LoadsRemote Voltage Sensing Remote Sense ConnectionsProgramming Response Time with an Output Capacitor Output Type FormulaOutput Noise Considerations Open Sense LeadsOvervoltage Trigger Connections External Trigger CircuitEquivalent Internal OV Trigger Circuit Power Supply Protection Considerations Battery ChargingParallel Operation Maximum Allowable Voltage Setting CV OperationCC Operation Remote SensingSeries Operation 13. Series Connections with Local Sensing CV OperationSpecifications for Series Operation 14. Series Connections with Remote SensingPage Remote Operation GP-IB OperationInterface Function GP-IB Address Selection Power-On Service Request PON Programming SyntaxNumeric Data Sheet 1 of 2. Syntax Forms for Power Supply Commands Sheet 2 of 2. Syntax Forms for Power Supply Commands Power Supply Commands Header Output Channel Data RangePower Supply Commands Initial ConditionsVOUT? Voltage ProgrammingVSET? Current ProgrammingAvg Current-Avg RangeAvg Resolution IOUT?Range Switching Output On/OffOvervoltage OV Protection OVSET?Overcurrent Protection OCP Clear Command Multiple Output Storage & RecallStatus Reporting Functional Relationship of Status Registers UNR +CCASTS? UNMASK?Unmask 2,XXX Bit Assignment of the Serial Poll Register FAULT?Service Request Generation PON RQS ERR RDY FAUSRQ? Reprogramming Delay RQS BitDisplay On/Off Other QueriesTEST? CMODE?GP-IB Code Error Messages Explanation Front Panel ResponseTEST? Responses Front PanelResponse Code Code ExplanationLocal Control Of Output Functions Local ModeLocal Operation GeneralSetting Voltage Setting CurrentResetting Overcurrent Protection Setting Overvoltage ProtectionResetting Overvoltage Protection Displaying the Contents of the Fault RegisterLocal Control Of System Functions Setting the Reprogramming DelaySetting the Supply’s GP-IB Address ConditionSTO Enter Displaying Error MessagesAddr Enter RCL EnterCalibration Procedures Test Equipment and Setup RequiredFigure A-1. Calibration Setup General Calibration Procedure Table A-1. Calibrat ion Commands Header Channel Data SyntaxSee Figure Page Clear Voltmeter Output Buffer Calibration Program10 ! Calibration Example PauseInput ANY More Outputs to CALIBRATE? Y or N,X$ Disp END of Calibration ProgramFnend Page Programming With a Series 200/300 Computer Path NamesVoltage and Current Programming Voltage and Current Programming With Variables Voltage and Current ReadbackService Request and Serial Poll Programming Power Supply RegistersPrint OUTPUT1 is in CV Mode END if Present StatusPrint ’’OVERVOLTAGE on Output #1 Enable IntrOFF Intr Print Overvoltage on Output #2Error Detection Programming Outputs Connected In Parallel Stored Operating StatesInput Enter Voltage LIMIT’’,V Input Enter Operating VOLTAGE,V1Programming Outputs Connected In Series Input Enter the Desired Current Limit POINT,ICommand Summary Table C-1. Command SummaryCommand Description Table C-l. Command Summary PON? ROM?SRQ? Table D-l. Power-On Self Test Error Message Error Codes and MessagesPower-On Self Test Messages Error Responses Test ResponsesTable D-2. Error Responses Error Code Message Explanation ERR? query ERR keyTable D-3. TEST? Responses Response Code Explanation TEST? queryManual Backdating Make Changes6621A Generally Applicable AnnotationsII. CE’92 Product Specific Annotations 6623AAgilent Sales and Support Office United States Latin AmericaManual Updates

6627A, 6621A, 6624A, 6623A, 6622A specifications

Agilent Technologies is renowned for its high-quality electronic test and measurement equipment, and the Agilent 6600 series is no exception. This series includes models like the Agilent 6621A, 6622A, 6623A, 6624A, and 6627A, each designed to meet the needs of various application requirements, making them an essential part of modern laboratories.

The Agilent 6621A is a single-output DC power supply that provides a stable output voltage and current, making it ideal for testing and powering electronic devices. It features a low noise specification, which is crucial for sensitive applications. With a maximum output voltage of 30V and a current of 3A, it offers flexibility for a range of projects, from powering prototypes to performing benchmark tests.

The Agilent 6622A, a dual-output model, enhances versatility by allowing users to power two devices concurrently. It delivers output voltages of up to 20V and a total output current of 5A, which is perfect for powering circuit boards with multiple components. The built-in voltage and current limiting functions protect the equipment under test, preventing any potential damage.

On the other hand, the Agilent 6623A provides additional capabilities with its three outputs, making it particularly suitable for complex testing procedures. With a maximum voltage of 20V and output current reaching 6A across all channels, it ensures that multiple loads can be powered simultaneously without compromising performance.

The Agilent 6624A further pushes these capabilities with its higher output power. This model boasts two outputs with a combined maximum output of up to 6A, supporting devices that require more demanding power levels. Its advanced control features allow for precise voltage and current adjustments, enhancing reliability during experiments.

Lastly, the Agilent 6627A stands out as a highly scalable power supply, capable of delivering up to 40V and 7.5A across its multiple outputs. This model is particularly beneficial for applications requiring higher voltages, enabling engineers and technicians to work with a broader array of components and systems.

All models in the Agilent 6600 series incorporate built-in protection features to guarantee safety during testing. They are equipped with memory functions, allowing users to save and recall settings quickly. Additionally, the intuitive interface and various connectivity options make these power supplies user-friendly, ensuring efficient workflow in any laboratory setting. In summary, the Agilent 6600 series offers a compelling combination of versatility, precision, and advanced features, catering to diverse electronic testing applications.
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