Agilent Technologies 669xA, 665xA, 664xA, 667xA Effect of Optional Headers, Moving Among Subsystems

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Figure 2-2. Partial Command Tree

Active Header Path

In order to properly traverse the command tree, you must understand the concept of the active header path. When the power supply is turned on (or under any of the other conditions listed above), the active path is at the root. That means the interface is ready to accept any command at the root level, such as TRIGger or STATus in Figure 2-2. Note that you do not have to precede either command with a colon; there is an implied colon in front of every root-level command.

If you enter STATUS, the active header path moves one colon to the right. The interface is now ready to accept : OPERATION, :PRESET, or QUESTIONABLE as the next header. Note that you must include the colon, because it is required between headers.

If you next enter :OPERATION, the active path again moves one colon to the right. The interface is now ready to accept :EVENT?, CONDITON?, ENABLE, NTRANSITION, or PTRANSITION as the next header.

If you now enter :ENABLE, you have reached the end of the command string. The active header path remains at :ENABLE. If you wished, you could have entered :ENABLE 18;PTRANSITION 18 and it would be accepted. The entire message would be STATUS:OPERATION:ENABLE 18;PTRANSITION 18. The message terminator after PTRANSITION 18 returns the path to the root.

The Effect of Optional Headers

If a command includes optional headers, the interface assumes they are there. For example, if you enter STATUS: OPERATION?, the interface recognizes it as STATUS: OPERATION: EVENT? (see Figure 2-2). This returns the active path to the root (:STATUS). But if you enter STATUS: OPERATION: EVENT?, then the active path remains at :EVENT. This allows you to send STATUS: OPERATION: EVENT?; CONDITION? in one message. If you tried to send STATUS:OPERATION?;CONDITION? the command path would send STATUS:OPERATION:EVENT? and then return to :STATUS instead of to :CONDITION.

The optional header SOURCE precedes the current, digital, and voltage subsystems (see Figure 3-2). This effectively makes :CURRENT, :DIGITAL, and :VOLTAGE root-level commands.

Moving Among Subsystems

In order to combine commands from different subsystems, you need to be able to restore the active path to the root. You do this with the root specifier (:). For example, you could clear the output protection and check the status of the Operation Condition register as follows (see Figure 3-2):

OUTPUT:PROTECTION:CLEAR

STATUS:OPERATION:CONDITION?

By using the root specifier, you could do the same thing in one message:

OUTPUT:PROTECTION:CLEAR;:STATUS:OPERATION:CONDITION?

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Contents Agilent Part No Microfiche Part No July Programming Guide Gpib DC Power SuppliesPrinting History Safety GuidelinesContents System Commands Description of Subsystem CommandsCurrent Subsystem Display SubsystemPower Supply Status Structure Operation Status Group Command Summary Programming ParametersVoltage Subsystem Questionable Status GroupPage About this Guide General InformationDocumentation Summary User’s GuideVXIplug&play Power Product Instrument Drivers Prerequisites for Using this GuideDownloading and Installing the Driver Accessing Online HelpRemote Programming Gpib Capabilities Of The Power SupplyIntroduction To Scpi ConventionsScpi Messages Types of Scpi CommandsStructure of a Scpi Message Voltlev 4.5PROT 4.8CURR?NLVolt LEV Prot Curr Parts of a Scpi MessageVoltlev 4.5 Prot 4.8 CURR? Query Indicator Traversing the Command TreeMessage Unit Separator Root SpecifierMoving Among Subsystems Effect of Optional HeadersOutputprotectionclear STATUSOPERATIONCONDITION? OUTPUTPROTECTIONCLEARSTATUSOPERATIONCONDITION?Scpi Queries Including Common CommandsValue Coupling Scpi Data FormatsExamples Controlling the Output Writing to the Display Saving and Recalling StatesProgramming Status Programming the Digital I/O Port System ConsiderationsGpib Address DigdataAssigning the Gpib Address In Programs Action Display ShowsDOS Drivers Error HandlingAgilent Basic Controllers Sample Program CodeIout = OUTPUTS2 Programming Some Power Supply FunctionsCall Ioenter PS,OEVENT SPOL%=O While C O Introduction Language DictionaryCommon Commands Syntax Diagram Description Of Common CommandsESE CLSIDN? ESR?OPC OPT? OPC?PSC PSC 0 *PSCQuery Syntax None Related Commands Command Syntax RCL NRf Parameters ExampleRCL PSC *RST *SAVSAV RSTSAV SRE Bit Configuration of Status Byte RegisterSTB? SRETST? TRGWAI Calibration Commands Description of Subsystem CommandsAbor AborCurr Currtrig Current SubsystemCurrprotstat Digdata Display SubsystemDisp Digdata 7 DigitaldatavalueDispmode Disptext DefaultmodeDisptext Dispmode Norm Displaymode Normal Displaywindowmode TextMeasure Subsystem Initiate SubsystemInit Initcont MEASCURR? MEASVOLT?Outp Output SubsystemOutpprotcle Outpprotdel Outprelpol OutprelOutprel 1 Outprel OFF Outprelpol NormStatpres Status SubsystemStatus Operation Registers STATOPER?Statoperenab STATUSOPERATIONENABLE?Statoper NTR Statoper PTR Statoperenab 1312 StatoperenabSTATQUES? Status Questionable RegistersSTATQUESCOND? StatquesenabSYSTERR? SYSTEMERROR? System CommandsStatques NTR Statques PTR SYSTERR?Systlang Trigger SubsystemSYSTVERS? TrigTrigsour Voltage SubsystemVolt Volttrig Trigsour BUS Triggersource BUSCommand Summary Command SummaryCommand Parameters Subsystem Commands VoltprotCommon Commands Parameters Command ParametersCurrlevtrig MAX Programming ParametersVoltlevtrig MAX Voltprot MAXPage Register Commands Power Supply Status StructureStatus Reporting Operation Status GroupWTG CALUNR OPCQuestionable Status Group Status Questionable Commands Register Query Cleared ByStandard Event Status Group STATQUESNTR?Initial Conditions At Power On Service Request Enable RegisterStatus Byte Register Output QueueServicing an Operation Status Mode Event PON Power-On BitDefault Power On Register States Condition Caused By StatpreAdding More Operation Events Monitoring Both Phases of a Status TransitionServicing Questionable Status Events DFI Discrete Fault Indicator Scpi Command CompletionRI Remote Inhibit WAIPage Power Supply Hardware Error Messages Error MessagesCalibration Error Messages System Error MessagesError Error String Description/Explanation/Examples Number Summary of System Error MessagesScpi Approved Commands Scpi Confirmed Commands1Scpi Conformance Information Scpi VersionNON-SCPI Commands1 Parallel Polling Compatibility LanguageCompatibility Language Curr VoltVSET? ISET? CURR? VOUT?Volttrig Hold OFFHold CurrtrigUNMASK? FAULT?SRQ OFF SRQIndex IndexOperation status group, 51 optional header Trig SOUR, 46 VOLT, 46 Volt PROT, 47 Volt Trig Canada Australia/New Zealand United States Latin AmericaEurope Asia Pacific Japan
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668xA, 669xA, 667xA, 664xA, 665xA specifications

Agilent Technologies has long been a pioneer in the production of high-performance electronic test and measurement instruments, particularly in the field of power sources. Among its notable offerings are the Agilent 667xA, 669xA, 665xA, 664xA, and 668xA series of power supplies. These instruments are designed to provide stable, reliable power for a variety of applications, including electronic testing, industrial processes, and research laboratories.

The Agilent 667xA series is characterized by its programmability and advanced measurement functions. These power supplies support a wide range of output voltages and currents, allowing for flexible configurations that cater to different testing needs. The built-in measurement capabilities enable users to monitor the voltage, current, and power with high precision, which is essential for ensuring optimal performance in electronic applications.

The Agilent 669xA series stands out with its high-power outputs, making it suitable for demanding applications. These power supplies deliver high voltage and current levels, making them ideal for testing high-performance devices, such as power amplifiers and motor drives. Additionally, the 669xA series includes features such as overvoltage protection and complex output sequencing to enhance the safety and reliability of the testing process.

The Agilent 665xA and 664xA series focus on delivering high accuracy and excellent regulation. These models are particularly known for their low noise operation, which is critical for sensitive applications where precision is paramount. The integrated programming capabilities allow users to automate testing sequences, thus improving efficiency in research and development settings.

The 668xA series features advanced digital signal processing that enhances the precision and stability of the output. Users benefit from features like remote sensing and monitoring, allowing feedback adjustments that maintain output accuracy despite cable losses. Furthermore, the 668xA models can integrate seamlessly with various test environments thanks to their LAN, GPIB, and USB connectivity options.

Overall, the Agilent 667xA, 669xA, 665xA, 664xA, and 668xA power supplies provide a comprehensive range of solutions for diverse electronic testing needs. With their advanced features, superb measurement capabilities, and robust performance, these instruments empower engineers and researchers to conduct their work with confidence, precision, and efficiency.
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