Agilent Technologies N6700 Making Measurements, Simultaneous Voltage and Current Measurements

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4 Operating the Power System

Making Measurements

Each output channel has its own measurement capability. The output voltage and current is measured by acquiring a number of samples at the selected time interval, applying a window function to the samples, and averaging the samples.

The power-on and *RST time interval and number of samples settings yield a measurement time of 21 milliseconds per reading (1024 data points at 20.48 μs intervals). The output windowing function is Rectangular. Use the following commands to make a measurement:

Front Panel:	SCPI Command:
Select the Meter key.	To measure average voltage or current:
	MEAS:VOLT?(@1:4)
	MEAS:CURR?(@1:4)

Simultaneous Voltage and Current Measurements

Some models have simultaneous voltage and current measurement capability (Refer to Chapter 1, “Model Differences”). In this case BOTH voltage and current are acquired on any measurement, regardless of the parameter that is being measured. To return both values of a simultaneous measurement:

Front Panel:	SCPI Command:
Not available.	First, measure the output voltage (or
	current):
	MEAS:VOLT?(@1:4)
	Then Fetch the other parameter:
	FETC:CURR?(@1:4)

Measurement Ranges

Some models have multiple voltage and current measurement ranges. (Refer to Chapter 1, “Model Differences”). Selecting a lower measurement range provides greater measurement accuracy, provided the measurement does not exceed the range.

Front Panel:	SCPI Command:
Select Measure\Range.	SENS:CURR:RANG 0.1, (@1)
Select a range and press Select.	SENS:VOLT:RANG 5, (@1)

The maximum measurable current is the maximum rating of the range. If the measurement exceeds the range, an “Overload” error will occur. Examples of programming measurement ranges are:

3.06 A range	To select, program values > 0.1 A and ≤ 3.06 A.
0.10 A range	To select, program values > 200	μA and ≤ 0.1 A.
200 μA range (option 2UA) To select, program values ≤ 200		μA.

58	Series N6700 User’s Guide

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Contents Agilent Technologies Low-Profile Modular Power System Legal Notices Agilent Technologies, IncSafety Notices GeneralThis Book Contents 103 Agilent Models N6751A/N6752A, N6753A/N6754A, N6761A/N6762A100 104Essential operating features of the power system Modular Power System MPSReferred to as MPS and power system throughout this manual Agilent N6700 Modular Power System At a Glance Output FeaturesSystem Features Model DifferencesFront Panel At a Glance Rear Panel At a GlanceSingle-channel view IndicatorsFront Panel Display At a Glance Interface statusOperating status Front Panel Keys At a GlanceNumber keys Front Panel Menu Reference OCPUSB Subsystem Commands Scpi Command SummaryScpi Command Description Scpi Command FUNCtion VOLTage CURRent, @chanlist SWEepALL Command Description Common CommandsRST Settings These settings are set by the *RST Reset commandInstallation Items Supplied General InformationModels OptionsRack Installation Installing the UnitSafety Considerations Inspecting the UnitInstallation Channel Number Bench InstallationCleaning Hz OperationPower cord, resulting in fire Connecting the Line CordInstallation Snap-On Ferrite CoreTerminals. Sense jumpers are provided for local sensing Connecting the OutputsScrews securely tightened Terminals in any other wayWire Size AWGResponse Time with an External Capacitor Multiple LoadsPositive and Negative Voltages N6700 Modular Power System Scope Remote Sense Connections Drop in the sense leads can degrade the voltage regulationOver-voltage Protection Considerations Parallel ConnectionsOpen Sense Leads Output Noise ConsiderationsFirmware revision B.00.00 and up When programming via the front panel or using Scpi commandsGrouping the Outputs Discussed in under System-Related OperationsSeries Connections Effect on SpecificationsRecovery Time Terminal may be more than 240 VDC from chassis groundSetting the Outputs Desired operating voltageEffect on Specifications Getting Started Menu structure is found in ChapterSelecting an Output Channel Entering an Output Voltage SettingTurning the Unit On Method 1 Use the Navigation and Arrow KeysEnabling the Output Entering a Current Limit SettingUse the On/Off key to enable the output Method 2 Use the Current key to enter a valueSet the Over-Voltage Protection Using the Front Panel MenuPress the Menu key to access the front panel command menu MenuCase of Trouble Exiting the Command MenuMeter Back There are two ways to exit the command menu Enter ChannelGpib Interface Connecting to the InterfacesCause the unit to reset and require operator intervention Automation-Ready CD that is shipped with your productLAN Interface USB-enabled instrument to the Universal Serial Bus USB.USB Interface Following figure illustrates a typical USB interface systemConnecting to a Site LAN Connecting to a Private LANDhcp server. You can leave these settings as they are. Most Release the previous settingsFactory-shipped instrument LAN settings are configured to Will come on when the LAN port has been configuredLAN Parameters Viewing the Currently Active LAN SettingsConfiguring the LAN Parameters Take effectName DomainReset LAN CommunicationUsing the Web Server ReducedUsing Sockets Using TelnetTelnet connections to be made Restoring the Non-volatile Factory Settings Enable/Disable the USB, LAN, and Web ServerSecuring the Interfaces Factory-shipped non-volatile LAN settings Other factory-shipped non-volatile settingsOperating the Power System Set the Output Voltage Programming the OutputSelect an Output Channel Set the Voltage Slew RateSequence Multiple Outputs Enable the OutputSet the Output Current Outpdelrise .1,@2Outp Front Panel Scpi Command Select Output\PolarityProgram the Output Relays Outprelpol REV,@1Front Panel Scpi Command Select Transient\Step Enable the Output to Respond to Trigger CommandsFront Panel Scpi Command Select Transient\Mode Synchronizing Output StepsSelect the Transient Trigger Source Initiate the Transient Trigger SystemTrigger the Output Generate Trigger Out SignalsFront Panel Scpi Command Select Transient\Control Scroll to and select AbortSimultaneous Voltage and Current Measurements Making MeasurementsMeasurement Ranges Set the Over-Current Protection Using the Protection FunctionsFront Panel Scpi Command Select Protect\OVP Enter a value in the OVP level box To 10 Press SelectCouple Output Protection Clear Output Protection FunctionsInstrument Identification System-Related OperationsSelf-Test Instrument State StorageSystgrodelall Front Panel Scpi Command Select System\GroupsOutput Groups SystrebFront Panel Keys Front Panel Scpi Command Select System\Preferences\LockFront Panel Scpi Command Select System\Preferences\Keys LockoutContrast Front Panel DisplayScreen Saver ViewList Function When the power system is turned offProgramming High-Speed Test Extensions All models Refer to , Model DifferencesProgram an Output Pulse or Pulse Train Front Panel Scpi Command Select Transient\List\ConfigFront Panel Scpi Command Select Transient\List\Pace Voltmode LIST, @1Trigtransour BUS, @1 Front Panel Scpi Command Select Transient\List\RepeatFront Panel Scpi Command Select Transient\TrigSource Inittran @1Program an Arbitrary List Select the List Step numberFront Panel Scpi Command Select the Transient\List\Repeat Liststep AUTO, @1Digitizer Function Adjust the Measurement Sample RateFront Panel Scpi Command Select Measure\Sweep Programming the DigitizerAcquisition trigger, use Specify a Window FunctionTo offset the measurement on Synchronizing Digitizer Measurements Front Panel Scpi Command Select Measure\WindowFront Panel Scpi Command Not Available Retrieve Measurement Array DataSensfunc CURR,@14 Select the Measurement Trigger SourceSensfunc VOLT,@14 TransientnTrigger the Measurement Front Panel Scpi Command Select Measure\ControlInitiate the Measurement Trigger System Trigacq @1Appendix a Specifications Performance Specifications Agilent Models N6751A/N6752A, N6753A/N6754A, N6761A/N6762ASupplemental Characteristics Down-programming Settling Time with no load Up-programming Time with full resistive loadUp-programming Settling Time with full resistive load Down-programming Time with Capacitive loadAutoranging Characteristic Output Impedance GraphsModel N6753A, CV Mode, @20V, 15A 0125 Magnitude Load Transient Recovery Time Agilent Models N6731B N6736B and N6741B N6746BCommon Mode Noise Temperature Coefficient per CFrom 20 Hz 20 MHz from either output to chassis Agilent Models N6773A N6776A 20 mA Agilent N6700B, N6701A, N6702A MPS Mainframes Environmental Conditions DimensionsNet Weight AC InputOutline Diagram 432.5 mm 17.03 482.6 mm 19.00 425.45 mmAppendix B Using the Digital Port Digital Control Port Pin Bit Configuring the Digital Control PortBi-directional Digital I/O Select System\IO\DigPort\PinnDigital Input Front Panel Scpi Command Select System\IO\DigPort\PinnExternal Trigger Front Panel Scpi Command Select System\IO\DigPort\Pin3 Fault OutputFront Panel Scpi Command Select System\IO\DigPort\Pin1 Inhibit InputClearing a System Protection Fault Fault/Inhibit System ProtectionMainframes Power rating of Agilent N6700 mainframes is as follows This chapter discusses the power allocation functionFor the majority of Agilent N6700 Modular Power System Rating of the mainframeModule Power Limit Power Limit OperationMainframe Power Limit Must reset the power limit to its maximum rated valueTo set a power limit on output Module Power AllocationPower limit function will not activate Page Appendix D Output On/Off Synchronization Power Modules Options and Mode Minimum Synchronizing Output Turn-on DelaysTutorial Outpcoup on ProcedureEnable the Synchronization Function Outpcoup OFFSpecify the Common Delay Offset Specify the Turn-On Delays for each Output ChannelSpecify which Output Channels will be Synchronized Digital Connections and Configuration Synchronizing Multiple MainframesDIGPIN6FUNC ONC OperationSystem\IO\DigPort\Pin6 DIGPIN7FUNC OffcIndex 11, 42 Inhibit inputInstrument ListRemote interface SpecificationsSystem protection Declaration of Conformity Manual Updates