Agilent Technologies 6623A, 6621A Overvoltage OV Protection, Ovset?, Overcurrent Protection OCP

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Overvoltage (OV) Protection

The programmable OV is a protection feature which can be set by the operator to protect the load against excessive voltage. When the actual voltage exceeds the programmed overvoltage setting for a given output channel, the OV is tripped. The OV circuit will fire the SCR crowbar which shorts across the output and the output assumes a low impedance state.

For example, to program the OV of output channel 1 to 9.5 V send the following command:

OVSET 1,9.5

To find out the OV setting for output channel 1 send the following query and address the supply to talk:

OVSET? 1

To enable an output after it went into overvoltage, you must first remove the overvoltage condition and then send the OV reset command.

To reset output 1 send:

OVRST 1

If you send the reset command without first removing the OV condition, the supply will fire the OV again.

NOTE

If the programmable OV fails, the supply has a fixed OV circuit which will fire the SCR crowbar if the

 

voltage exceeds 120% of the maximum rated output. The fixed OV circuit will also fire the SCR crowbar

 

if the supply is off (line cord disconnected) and an external source is supplying voltage which exceeds

 

120% of the maximum rated output.

Overcurrent Protection (OCP)

The OCP is a protection feature employed by the power supply to guard against excessive output currents. When the output enters the + CC mode and the OCP is enabled, the OCP circuit down programs the output voltage and disables the output.

To enable the OCP, for output channel 1, send the command

OCP 1,1

To disable the OCP, send the command

OCP 1,0

You can find out the OCP setting by sending the following query and addressing the power supply to talk.

OCP? 1

The response from the power supply is either a "0" to indicate that OCP is off or a ’’1" to indicate that it is on. To reset the output channel after an overcurrent trip, you can either disable the OCP and send the reset command, or you can reduce the output current below the programmed current and then send the reset command. To reset output 1, send the command:

 

OCRST 1

 

 

NOTE

The supply can report a fault condition when an output is in overvoltage or overcurrent. Although the

 

OVRST and OCRST commands reenable the output, they do not clear the fault register. As a

 

housekeeping measure, it is advisable to always clear the fault register by querying its value after an OV

 

or OC reset.

 

 

Remote Operation 71

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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 OperationCommand Summary Error MessagesCalibration Programming With a Series 200/300 ComputerSafety Considerations General InformationIntroduction Instrument and Manual IdentificationAccessories DescriptionModel Output Combinations AvailableBasic Operation GP-IB BoardOutput Boards Definitions SpecificationsQualifying Conditions Output Response Characteristics Specifications Source EffectSupplemental Characteristics Outputs Low High Voltage Temperature CoefficientReadback Resolution OVPLow Voltage General Information General Information General Information General Information Location and Cooling InstallationInitial Inspection Input Power Requirements Line FuseGP-IB Line FusesPower Cord Line Voltage ConversionGP-IB Interface Connector Turning On Your Supply Front Panel Controls and IndicatorsGetting Started 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 DisplayCurrent Test Voltage TestOvervoltage Test Introduction To Remote Operation Iset EnterOCP RSTSending a Remote Command OutputReading the GP-IB Address AddrDisp a Often Used CommandsGetting Data From The Supply Disp a Returning the Supply to Local Mode Output Connections and Operating Information Output RangesRange Selection Protection FeaturesOperating Quadrants 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 ConnectionsOutput Type Formula Output Noise ConsiderationsProgramming Response Time with an Output Capacitor Open Sense LeadsOvervoltage Trigger Connections External Trigger CircuitEquivalent Internal OV Trigger Circuit Parallel Operation Power Supply Protection ConsiderationsBattery Charging 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 Interface Function Remote OperationGP-IB Operation GP-IB Address Selection Numeric Data Power-On Service Request PONProgramming Syntax 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 ConditionsVoltage Programming VSET?VOUT? Current ProgrammingAvg Current-Avg RangeAvg Resolution IOUT?Range Switching Output On/OffOvercurrent Protection OCP Overvoltage OV ProtectionOVSET? Status Reporting Clear CommandMultiple Output Storage & Recall Functional Relationship of Status Registers UNR +CCUnmask 2,XXX ASTS?UNMASK? FAULT? Service Request GenerationBit Assignment of the Serial Poll Register PON RQS ERR RDY FAUSRQ? Reprogramming Delay RQS BitDisplay On/Off Other QueriesTEST? CMODE?GP-IB Code Error Messages Explanation Front Panel ResponseFront Panel Response CodeTEST? Responses Code ExplanationLocal Mode Local OperationLocal Control Of Output Functions GeneralSetting Voltage Setting CurrentSetting Overvoltage Protection Resetting Overvoltage ProtectionResetting Overcurrent Protection Displaying the Contents of the Fault RegisterSetting the Reprogramming Delay Setting the Supply’s GP-IB AddressLocal Control Of System Functions ConditionDisplaying Error Messages Addr EnterSTO Enter RCL EnterCalibration Procedures Test Equipment and Setup RequiredFigure A-1. Calibration Setup See Figure General Calibration ProcedureTable A-1. Calibrat ion Commands Header Channel Data Syntax Page Calibration Program 10 ! Calibration ExampleClear Voltmeter Output Buffer PauseFnend Input ANY More Outputs to CALIBRATE? Y or N,X$Disp END of Calibration Program Page Voltage and Current Programming Programming With a Series 200/300 ComputerPath Names Voltage and Current Programming With Variables Voltage and Current ReadbackProgramming Power Supply Registers Print OUTPUT1 is in CV Mode END ifService Request and Serial Poll Present StatusEnable Intr OFF IntrPrint ’’OVERVOLTAGE on Output #1 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 Description Command SummaryTable C-1. Command Summary Table C-l. Command Summary PON? ROM?SRQ? Error Codes and Messages Power-On Self Test Messages Error ResponsesTable D-l. Power-On Self Test Error Message 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 ChangesGenerally Applicable Annotations II. CE’92 Product Specific Annotations6621A 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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